Frequency Sentence Examples
The difference in this case is that it is getting to be a pattern — increasing in frequency and violence.
As he travels further round the frequency increases still more.
Of the four bells connected to a circuit each responds to a different frequency.
The frequency of breath holding spells varies from several times a day to perhaps only once a year.
French forks are marked with double the true frequency, so that Uta is marked 512.
Moreover, the frequency of sneezing should be the real concern.
But if their velocities are different, the frequency of the waves received is affected both by these velocities and by that of the wind.
The frequency of its administration depends heavily on a cat's lifestyle factors.
Original pieces of furniture from the Victorian times do come up with relative frequency at auctions and estate sales, but these can be extremely expensive.
While the symptoms of meth addiction can vary among users depending on the amount of the drug being taken and the frequency of use, there are a few signs that indicate addiction.
AdvertisementStarting in the 13th week, the frequency of the sessions drops down to one per week.
Parents enjoy seeing activity on college campuses, and may even use web cams to check up on their children and increase communication frequency.
F., et al. "Increased frequency of acute mastoiditis in children."
The structure of the human hand contributes to the frequency with which closed-fist bites are likely to become infected.
In one study pacifier use increased the frequency of ear infections by 50 percent.
AdvertisementIn the early 2000s the frequency of left-handedness appears to be on the increase.
It's never been this easy to discover the enormous sound potential of frequency modulation.
This drug can be highly toxic, so your vet will carefully monitor the dosages, frequency of medication and your cat's vital functions.
A 2006 paper presented in the proceedings from the 12th International Conference on Low Frequency Noise and Vibration and its Control reported that cats purr as a natural healing mechanism.
If your cat begins vomit with any sort of frequency, it is advisable to have your pet examined by a veterinarian.
AdvertisementToday, tin ceilings are not used or produced with such frequency and a true tin ceiling can cost a great deal of money for artisans to produce.
Being vigilant about portion size and frequency of meals is very important as well.
However, it's important to note that the frequency of podcast programs varies.
High frequency sounds transmitted through the ear or pressure points of the body releases energy from the cortex of the brain.
Young men will notice that they've filled out more and that penile erections occur with greater frequency.
AdvertisementPopularity and trends fluctuate with such great frequency that it can be difficult to keep up.
We thus found a high frequency of allele-specific and locus-specific down-regulation of HLA expression in uveal melanoma cell lines.
Dolby C works over a wider frequency range and reduces hiss by 15 to 18 dB.
The frequency histogram for the lesson preparation task was similar.
This unit has optics which add together two of the dye laser photons, effectively doubling their frequency.
The ability to read texts with high frequency lexis and personal letters.
The axis data must be the common logarithm of frequency in Hertz.
The results indicated a low frequency of microsatellite length mutations as the association was consistent across several breeds.
Chain lube frequency depends on whether you use a dry lube or a wet lube.
In this way the frequency of the transition observed in the fountain can be related to that of the hydrogen maser.
The integration is done in frequency partitions that use the midpoints between adjacent spectral peak frequencies.
At least two tests were carried out at each temperature interval and the mean frequency value used to calculate the elastic modulus.
As for the comparison of high versus low frequency morpheme pairs, a significant frequency effect was found in both subject and item analyzes.
The Dalton figure for the treble nominal I was unable to substantiate, I cannot find anything at that frequency in my recording.
Available for change are the forcing strength F and the forcing frequency omega.
Translucent oyster shells are a common substitute for glass; and the walls are whitewashed, but on account of the frequency of earthquakes are not plastered.
The best simple measure of the frequency of deviations from the mean character is the "standard deviation" or "error of mean square" of the system (see article Probability), in this case equal to 1.68 glands.
Leyden jars are now much employed for the production of the high frequency electric currents used in wireless telegraphy (see Telegraphy, Wireless).
Do consider the frequency of use when selecting the skirt material.
The size of the property, its amenities, location, time of the year and frequency of use determine the price you pay.
Contrary to popular belief, just because a phone operates at a larger frequency (like 5.8 Ghz) does not mean you have a larger range.
The frequency allows the phone to minimize interference, which affects clarity and quality of signal.
Not only will you save money, but by buying in bulk at wholesale prices you will also lower your order frequency.
A single band router will only offer one frequency or the other, while a dual band router will simultaneously create networks on both frequencies.
Now let's address the frequency of Kitty's eliminations.
She weaves her way around their ankles and rubs up against them; perhaps she's also calling out loudly and doing so with irritating frequency.
Keeping up with child stars then and now is quite easy, as they appear in tabloid headlines or turn up on popular talk shows with some frequency.
College radio stations run the gamut from sharing commercial tower space with local stations and broadcasting over a wide area to low frequency, homespun-type systems.
The frequency of amyloidosis varies among the different ethnic groups, and its overall incidence is difficult to determine because of the use of colchicine to avert the problem.
The frequency and severity of a person's attacks of fever and serositis seem to have no relation to the risk of developing amyloidosis.
In the late twentieth century, colchicine was discovered to also be effective in reducing the frequency and severity of attacks in FMF.
It is also effective in reducing the frequency and severity of attacks in familial Mediterranean fever.
The frequency of the condition increases from less than 1 percent in the general population to 2-20 percent when a parent is affected.
It is a relatively rare condition that does not appear to affect children of any particular race, gender, or nationality with more frequency.
These medications must be taken daily to reduce the frequency and severity of headaches, and they may take a few weeks to be fully effective.
Parents can help their child create and maintain a headache diary to record headache symptoms, triggers, as well as the duration and frequency of the headaches.
It reduces the frequency of asthmatic attacks and is suitable for long-term use.
Penetrating injuries to the nasal area caused by air gun or BB pellets were as of 2004 also reported with increasing frequency in older children and adolescents.
Falls account for most other nasal fractures in children, although dog bites are reported with increasing frequency as a cause of nasal fractures in children below 16 years of age.
The frequency and severity of adverse effects will vary depending on the antihistamine.
Stress is also a factor in increased frequency of psoriatic episodes.
Although certain porphyrias are more common than others, their greater frequency is only relative to other types.
The doctor will ask about the frequency and appearance of the diarrhea as well as about other digestive symptoms.
Psychiatric risk factors, such as depression and substance abuse, become more frequent in adolescence, contributing to the increase in the frequency of suicidal behavior in older children.
The primary purpose of audiometry is to determine the frequency and intensity at which sounds can be heard.
Humans can hear sounds in the frequency or pitch range of 20 to 20,000 Hertz (Hz), but most conversations occur between 300 and 3000 Hz.
The difficulty with this test is that the noises used are not standardized in frequency or intensity.
The frequency of a sound is the number of vibrations per second.
Within the audible range, frequency means pitch-the higher the frequency, the higher a sound's pitch.
What the baby eats can make a difference in stool frequency and acidity.
Nor is there a correlation between the frequency of spells and scores on behavioral profiles.
Treatment may decrease the number of spells in some anemic children; however, treatment with iron increases the frequency of spells in children who are not anemic.
In males past the age of puberty, side effects include increased urinary frequency, breast tenderness and enlargement, and frequent erections.
By means of several adjusting screws the force and frequency of these blows can be exactly regulated.
But the same resonator will be appreciably though less affected by waves of frequency differing slightly from its own.
A fork of frequency 256 was used as the source.
The open orifice of the resonator was then exposed to the waves from a source of its own frequency.
Fritz (2) has, however, drawn a series of curves which are believed to give a good general idea of the relative frequency of aurora throughout the northern hemisphere.
Between the Shetlands and Iceland we cross the curve of maximum frequency, and farther north the frequency diminishes.
If sunlight and twilight were the sole cause of the apparent annual variation, the frequency would have a simple period, with a maximum at midwinter and a minimum at midsummer.
Whether there is any real difference between high and mean latitudes in the annual frequency of the causes rendered visible by aurora, it is difficult to say.
With a view to more minute examination, the annual frequency can be expressed in Fourier series, whose terms represent waves, whose periods are 12, 6, 4, 3, &c. months.
Sunlight is not the only disturbing cause in estimates of auroral frequency.
These show how the frequency of visible auroras diminished as cloud increased from o (sky quite clear) to 10 (sky wholly overcast).
Smoothing them, Carlheim-Gyllenskold gives f = too' -7.3c as the most probable linear relation between c, the amount of cloud, and f, the frequency, assuming the latter to be loo when there is no cloud.
The same phenomenon appears at Jan Mayen especially in November, December and January, and it is the normal state of matters in temperate latitudes, where the frequency is usually greatest between 8 and io P.M.
There are 82 channels to eliminate dual frequency distortion from other devices.
Increased frequency of publication to bi-monthly in mid 1991.
The error model specifies how accurate the allele frequency estimates are.
For example, in Russia radio frequency weapons have been used to defeat security systems.
At the end of the study, average seizure frequency had fallen to forty seizures per week.
Descriptive analyzes to examine the frequency distribution, chi-square test and factor analysis were applied using SPSS.
The high frequency modulation moves the signal away from 1/f noise region.
Single pipes are usually set at " A " with a frequency of 440Hz which matches the fifth fret of the first string.
A crossmatch of maternal serum versus paternal granulocytes will be performed to determine the presence of low frequency granulocyte-specific antibodies.
Within each frequency grouping, adverse reactions are ranked in order of decreasing seriousness.
However they could vibrate at much lower harmonics, which could feasibly give rise to a low frequency hum.
This was at the fundamental frequency and/or low-order harmonics, not the high frequencies of noise.
These small munitions contain high explosives that produce radio frequency energy as their primary kill mechanism.
A microwave oven employs a device called a magnetron which produces strong magnetic fields with very short wavelengths (high frequency ).
Single band routers will typically offer just 2.4GHz for the greatest flexibility, as nearly all 802.11n wireless devices -- like tablets and smartphones -- will use that frequency.
The specific treatment prescribed will depend upon the type and frequency of the headache, its cause, and the child's age.
Through the headphones or earpiece pure sounds in both frequency and intensity are transmitted to the patient and the threshold at which the patient can hear for each frequency is established.
Violent scenes or frightening science fiction stories appear to influence the frequency and intensity of children's nightmares.
They generally diminish in severity when the child is involved in an absorbing activity such as reading or doing homework, and increase in frequency and severity when the child is tired, ill, or stressed.
It is supposed to reduce the frequency of tic bouts by increasing the child's awareness of them.
Both Munchausen syndrome and Munchausen syndrome by proxy are thought to be rare, but there are no solid statistics on the frequency of either diagnosis.
Language and learning difficulties occur with the same frequency in monolingual and bilingual children.
Frequency and length of chemotherapy treatment depends on the form of cancer, types of drugs, how the patient responds to the treatment, and the patient's health and ability to tolerate the drugs.
The highest frequency of alpha thalassemia diseases occurs in individuals of Southeast Asian and Chinese descent.
One study of 500 pregnant women in northern Thailand estimated a frequency of one in 500 pregnancies affected by alpha thalassemia major, for example.
Traveler's diarrhea-An illness due to infection from a bacteria or parasite that occurs in persons traveling to areas where there is a high frequency of the illness.
Antiepileptic drugs are medicines that reduce the frequency of epileptic seizures.
A woman can assist the doctor in diagnosing the cause of oligomenorrhea by keeping a record of the time, frequency, length, and quantity of bleeding.
Plyley. "Onset of Puberty, Menstrual Frequency, and Body Fat in Elite Rhythmic Gymnasts Compared with Normal Controls."
The most common telltale symptom, however, is PCP; in fact, the frequency of Pneumocystis carinii pneumonia in children with hyper-IgM syndrome was a useful clue to geneticists searching for the mutation that causes the disorder.
The frequency of treatment with coagulation factors depends on the severity of the individual's disease.
Developmental changes throughout childhood bring differences in the sleep-wake cycle and in the type and frequency of parasomnias that may interrupt sleep.
Following the distribution of the first 10 million doses of VZV, it was determined that severe reactions occurred with a frequency of approximately one in 50,000.
Unlike other types of adverse drug reactions, the frequency and severity of allergic reactions to drugs usually are independent of the amount of drug that is administered.
Symptoms are often vague and include (in order of frequency) fatigue, headache, dizziness, sleep disturbances, cardiac symptoms, apathy, nausea, and memory disturbances.
The frequency of bladder infections in humans varies significantly according to age and sex.
The early symptoms of cystitis in women are dysuria (pain on urination); urgency (a sudden strong desire to urinate); and increased frequency of urination.
Although the list of potential side effects and adverse effects is very long and contains some severe risks, the actual frequency of these risks is low.
Chronic hives may be aggravated by stress, caffeine, alcohol, or tobacco; avoiding these may reduce the frequency of reactions.
One enduring myth is that female masturbation can lead to decreased sensitivity of the clitoris resulting in a decrease in the frequency and intensity of female orgasm.
The median frequency was seven times a week and the median length was two and one-half minutes.
The exact incidence and prevalence of EC and ED are not known, but these diseases are occurring or being diagnosed with increasing frequency and are especially prominent in children.
The frequency of severe combined immunodeficiency is estimated to be one out of every 50,000 to 500,000 births, and of combined variable immunodeficiency, one out of every 10,000 to 50,000 births.
An EEG returns normal results when brain waves have normal frequency and amplitude and other characteristics are typical.
Nightmares usually diminish in frequency and intensity over time.
In rTMS, a large magnet is placed on the patient's head and magnetic fields of different frequency are generated to stimulate the left front cortex of the brain.
Diagnosis is based on the severity, frequency, and duration of symptoms, and other factors that could indicate the presence of a serious illness.
The type of nystagmus can accurately be determined by eye movement recordings, which map direction, frequency, null point, and amplitude of the nystagmus.
Frequency of massage sessions can vary widely as needed based on the condition being treated.
Sometimes, children experiencing normal disfluencies hesitate during speech or use fillers, including "um," with frequency.
The physician will ask detailed questions about the child's symptoms, including when they first occurred, what seems to cause them, the frequency and severity, and how they are being managed.
Children with asthma should follow up with their doctor every one to six months, depending on the frequency of attacks.
The frequency and duration of HSV lesions can be reduced with antiviral therapy, including acyclovir (Zovirax), famciclovir (Famvir), and valacyclovir (Valtrex).
Examples are vitamin C (to boost the immune system), zinc (to reduce the frequency of HSV outbreaks), aloe (a possible antiviral), lemon balm (to speed healing), and licorice (with anti-inflammatory and antiviral effects).
The flutter valve is a hand-held mucus clearance device designed to combine positive expiratory pressure (PEP) with high frequency airway oscillations.
In the first version of the IBQ, published in 1981, parents were asked to rate the frequency of these temperament-related behaviors in their child over a two-week period.
The parents of a young child who has head tilt and is just learning to walk may also be concerned about the frequency with which their child loses his balance, increasing the risk of injury.
Therefore, hyperglycemic episodes are also noted to be increasing in frequency among young people admitted to hospitals for treatment of diabetes.
The label on the preparation should be checked for recommendations on length and frequency of use, since nasal sprays and nose drops should not be used for more than a few days.
Domestic pets should be vaccinated against rabies; people should consult a veterinarian for advice about the frequency of booster vaccinations for the area in which they live.
This includes the frequency needed for hair cuts and trims as well as prolonged styling.
A smaller afro could have tapered sides to better suit particular face shapes, and a buzz cut could have a longer top to help elongate a face and reduce the frequency of trims.
Although the price of almost thirty dollars per bottle may deter some consumers, Wen fans claim their hair has never looked or felt better, and that they actually find their frequency of shampooing decreases.
If you aren't able to work that level of frequency into your schedule, at least plan to check for new postings several time each week.
To include this information in the amortization schedule, list the frequency and amount on the mortgage calculator.
For some who find themselves incapacitated due to the frequency and severity of the migraines, more detailed tests may be undertaken to ensure there is not a more complex underlying cause.
The pre-labor contractions are inconsistent both in frequency and in duration.
This increasing frequency and worsening of nausea is, for many women, an unmistakable sign that they are pregnant.
What is your frequency and timing of intercourse?
Perhaps unsurprisingly, a 2006 study found that the amount of sexual activity that teens see in the media correlates with their frequency of sexual encounters.
In addition, an early sign of conceiving a baby is that the hormones increase the frequency of urination.
While fatigue and headaches caused by hormones are often noticed by women or their spouses, increased frequency of urination may be overlooked.
The cost to increase the number and frequency of the ferries was determined to be immense and was projected to grow even higher based on the growing Bay Area population.
The frequency of a wave of light is expressed to the naked eye as a color, so the tinting of your lenses has a direct effect on the kind of light they block out.
Side effects of taking melatonin supplements vary from one individual to another and can be influenced by factors such as the time of day and the frequency of consumption.
Women taking probiotic supplements also mention reduced number, frequency and duration of vaginal yeast infections.
This is because like other light sources, infrared has a set frequency to which it vibrates.
The scientific reason behind this phenomenon states that the infrared's higher frequency forces the lower-frequency of the organic matter to speed up.
Black and Decker recommends that users replace the filters on their Dust Busters approximately every six to nine months depending on frequency of use.
Ask them questions about performance, construction, size, ease of cleaning and frequency of use.
This site also has a crossword solver as well as word lists based on the frequency of letters included in Scrabble.
By using the frequency of letters included in Scrabble, players can gain a larger vocabulary when they see what words those letters can form.
In the profile section, each member has a photo, name of the city they live in, a physical description, drinking frequency, vegetarian/meat eater, religion, smoker/non-smoker, sun sign, and what type of person/relationship you are seeking.
Boring someone has less to do with frequency of calling and has more to do with not demonstrating interest in the other person with whom you are in a conversation with as well as not reciprocating in the exchange of communication.
I think of frequency of calling as something that evolves over time.
For this reason the frequency of calling should coincide with this building of emotion for both of you.
When couples are unhappy, the frequency and quality of sex usually goes down.
Despite the apparently common nature of this form of gluten intolerance, it is diagnosed with far less frequency than actual celiac disease.
Green is generally thought to contain a healing frequency.
The Internet has only served as a breeding ground for the distribution of the urban legends hoax, so there's little hope that these stories will decrease in number or frequency.
Other researchers are working on finding ways to help entities manipulate electromagnetic frequency (EMF) with a speech chip that converts the spirit-modulated EMF into words or allophones.
Examples of factors that can influence spending include location, special dietary needs, frequency of restaurant meals, and the amount of time available to devote to meal preparation.
Many online sites have featured True Blood related articles throughout the spring, increasing in frequency as the June 14, 2009 premiere date for the second season approached.
The different styles available include the Emergency, which has a built-in micro transmitter that broadcasts on 121.5 MHz aircraft emergency frequency.
The built in micro transmitter broadcasts on the 121.5 MHz aircraft emergency frequency.
The distress frequency has a range of approximately 100 miles and transmits on the frequency that is monitored by Cospas-Sarsat, an international search-and-rescue operation.
Such criteria could be the sudden increase in ambient sound level, a certain frequency being hit, the duration of a sound, or a combination of all those.
Atomic clocks rely on atomic resonance frequency standards to count time in the most accurate manner possible.
Functioning by way of atomic resonance frequency standards, most atomic clocks measure time to an accuracy of one to two seconds.
These local centers host Ananda Marga events periodically; the frequency of such events depends on the size of the center and the amount of people in the region who stay up to date with this group and philosophy of lifestyle.
The phase speed of the L and R wave modes have the same phase velocity at this frequency.
This pressure controls the pump speed through a frequency inverter whilst the pressure pulsation in the feed line is minimized.
This is comparatively puny slice, the potential for harm from radiation increases with frequency.
The modulation frequency corresponds to the Larmor precession frequency of the spin, or the Zeeman energy splitting of the spin quantum state.
A pair of identical quartz crystals with axes arranged mutually perpendicular would be required with output signals added to produce a beat frequency.
Band exposure quotient The sum of the frequency exposure quotients of a band at a location.
Emergency position indicating radio beacons (EPIRB) are electronic devices that gives off a radio signal on the designated frequency of 406 MHz.
At this frequency a parallel resonant circuit is formed between the primary inductance and the net capacitive reactance reflected back from the secondary.
We have seen in Section 1 that the pulse repetition frequency (p.r.f.) is the number of pulses occurring in one second.
Therefore we should look at what happens if we drive the resonator at a frequency that deviates significantly from its natural resonant frequency.
However the inertia of the coil reduces high frequency response.
At the end of the study, average seizure frequency had fallen to forty seizure frequency had fallen to forty seizures per week.
There exists several suitable techniques to cope with frequency selectivity.
A voltage selector plug permits adjustment of the output voltage, and the frequency can also be adjusted by tap selection internally.
Without them, an early 8th century date would be likely, to account for the low frequency of Ipswich ware sherds.
However, there was no shirking in the turnout for a lecture on " The Econometrics of Ultrahigh Frequency Data.
Dual frequency simplex operation was used, so posts could not communicate with each other.
The second component at frequency 200 remains a damped sinusoid.
Further, the signal may be a slowly varying low frequency anharmonic oscillation, or a high frequency sinusoid.
How can we reduce the frequency of unscheduled smears?
It has been developed from the well proven telemetry system used on the GeoAcoustics dual frequency side-scan sonar.
Before we can get to work on what the speech means we must work out from the frequency spectrogram what words are being spoken.
Road traffic noise is variable and the frequency spectrum itself is not ideal for masking speech.
Stride frequency is the time required to complete a stride frequency is the time required to complete a stride and is limited by the stride length.
Responses on some labeled attitude measurement scales (e.g., interest in watching football) can also be nicely summarized via the frequency table.
Usually a nose or throat swab Frequency of testing?
Intended for amateur radio operators, the book also gives instructions for smaller projects such as simple frequency synthesizer and spectrum analyzer.
In the radio frequency weapons area, you are talking tens of meters to tens of kilometers.
In the radio frequency weapons area, you are talking tens of meters to tens of meters to tens of kilometers.
Infrared tympanic thermometers (ITT's) measure the frequency of infrared light emitted by the tympanic membrane.
A percentage transmittance of 100 would mean that all of that frequency passed straight through the compound without any being absorbed.
Infrared tympanic thermometers (ITT's) measure the frequency of infrared light emitted by the tympanic thermometers (ITT's) measure the frequency of infrared light emitted by the tympanic membrane.
The probe is optimized for amplitude and bandwidth, in order to present small scale surface undulations of a high spatial frequency to users.
Small imperfections disappear, and even higher frequency undulations seem not to disturb it at all.
Correspond determines the similarity of codon usage of two or more codon frequency tables.
The original 60's design wah-wah pedal, with modified circuitry to deliver fatter, more open sound by lowering the effect's frequency range.
Therefore a fifteen inch woofer requires a huge box to keep its resonant frequency low enough.
If high-intensity workouts boost the body's metabolic rate, what is the impact of high- frequency training, eg twice daily workouts?
A natural saltmarsh system shows a clear zonation according to the frequency of inundation.
Seeing that the tribe was blotted out at the beginning of the 3rd century B.e., we can scarcely wonder that no record of its speech survives; but its geographical situation and the frequency of the co-suffix in that strip of coast (besides Aurunci itself we have the names Vescia, Mons Massicus, Marica, Glanica and Caedicii; see Italic Dialects, pp. 283 f.) rank them beyond doubt with their neighbours the Volsci.
They occur with frequency also in northern Africa, and in many parts of North and South America the aboriginal populations have practised similar customs. Sepulchral tumuli, however, vary so much in shape and size that the external appearance is no criterion of age or origin.
As an example of a large area throughout which thunder frequency for Hungary relates to the number of lightning strokes causing fire, and the figures for the United States relate to deaths by lightning.
It is precisely defined by a vibration number recording the frequency of the pulsations of a tense string, a column of air, or other vibrator, in a second of time.
Through this electromagnet pass impulses of current regulated in frequency by a tuningfork contact breaker; these impulses, acting on the teeth of the iron wheel, by a series of pulls keep it in uniform rotation.
It has sometimes been claimed that Edison's proposed elevated plates anticipated the subsequent invention by Marconi of the aerial wire or antenna, but it is particularly to be noticed that Edison employed no spark gap or means for creating electrical high frequency oscillations in these wires.
It was seen that the effect of the impact of the incident electric waves upon the vertical receiving wire was to create in it electrical oscillations, or in other words, high frequency alternating electric currents, such that whilst the potential variations were a maximum at the top or insulated end of the antenna the current at that point was zero and at the base the potential variation was zero and the current amplitude a maximum.
Stone similarly devised a multiple inductive oscillation circuit with the object of forcing on the antenna circuit a single oscillation of definite frequency.'
If the two circuits are in tune so that the numerical product of capacity and inductance of each circuit is the same or C L, = C L +CL and if k is the coefficient of coupling then the natural frequency of each circuit is n = I /2w / (CL), and when coupled two oscillations are set up in the secondary circuit having frequencies n and n2 such that n = n0/ (i - k) and n = nh,/ (I +k).
If a simple receiving antenna as above described is set up with an oscillation-detecting device attached to it, we find that it responds to incident electric waves of almost any frequency or damping provided that the magnetic force of the wave is perpendicular to the antenna, and of sufficient intensity.
On the other hand, if a closed oscillation circuit is constructed having capacity and considerable inductance, then oscillations can be set up in it by very small periodic electromotive forces provided these have a frequency exactly agreeing with that of the condenser circuit.
The success so far achieved in isolating electric wave telegraphic stations has been based upon the principles of electric resonance and the fact that electric oscillations can be set up in a circuit having capacity and considerable inductance by feeble electromotive impulses, provided they are of exactly the natural frequency of the said circuit.
If therefore we can measure the frequency of the oscillations in an antenna we are able to tell the wave-length emitted.
Moreover, as the velocity of propagation is a function of the frequency, there is distortion of the complex waves.
Towards morning the fever abates; the pulse falls in frequency, but does not come down to the normal; headache and aching in the loins and limbs become less, but do not cease altogether; the body temperature falls, but does not touch the level of apyrexia.
The frequency of select-committees and commissions, which sat in 1814, 1821 and 1822, 1833 and 1836, testifies to the gravity of the crisis.
Observe that an increase of the frequency of movement, or even of the average daily movement, is not necessarily objectionable, since changes are less harassing when they take place by small increments than when they are brought about by a few big variations.
There is also a difficulty about the frequency of movement, because as a rule many movements take place in one day the total over a period sufficiently lengthy to yield general results is enormous, and many are unrecorded.
However, the count of frequency of movement from daily closing prices would probably afford a roughly satisfactory comparative measurement in markets in which prices sometimes remain the same for a day or two together.
The instrument can be calibrated by continuous currents and may then be used for high frequency alternating currents.
The frequency with which even the most highly cultivated strains produce degenerate offspring is notorious, and is probably the reason for the profound belief in telegonic action asserted by most breeders.
There is a close analogy between the variation of dielectric constant of an insulator with electric force frequency and that of the rigidity or stiffness of an elastic body with the frequency of applied mechanical stress.
He found that his crystal-grating gave a spectrum of two lines for each element and that their frequency increased by definite steps ashepassed from one element to the next; indeed, the frequency of vibration associated with each element was a simple function of a number which he found to be identical with the atomic number.
The high cheek-bone and the hawk'sbill nose are universally distributed in the two Americas; so also are proportions between parts of the body, and the frequency of certain abnormalities of the skull, the hyoid bone, the humerus and the tibia.
In Rayleigh's experiment the 32 fork was made to drive electrically one of frequency about 128, and somewhat as with the phonic wheel, the frequency was controlled so as to be exactly four times that of the 32 fork.
When two tones are sounded together with frequencies not very different, " beats " or swellings-out of the sound are heard of frequency equal to the difference of frequencies of the two tones (see below).
The standard frequency for laboratory work is c =128, so that middle L' = 256 and treble c"= 512 The standard for musical instruments has varied (see Pitch, Musical).
Unfortunately, this frequency may cause inference with cell phones or cordless phones; this interference causes loud screeching noises and can be very annoying.
Depending on the frequency, you may also have interference with your neighbors' monitors or cordless phones.
You can also set your monitor to a different frequency than your cordless phone to lower the risk of interference.
Using two separate video monitors increases the risk of frequency interference since monitors often use similar frequencies.
Because each receiver is programmed on a different frequency, interference isn't usually an issue.
The clarity of its 900Mhz frequency and the 350 foot range make this monitor a favorite among parents.
Check on posting dates, posting frequency, and topic relevancy before you sign up to become a member and begin posting.
Ensuring good air circulation tends to reduce disease frequency, and pests can be spotted and plants isolated in the event of an outbreak.
This used a single frequency to open and close the door.
However, if your ultimate goal is to wear these clothes time after time, year after year, then you can rely on the old "cost per wear" analysis that takes into account the item's price and the frequency it will be worn.
These ingredients are common allergens which can cause allergy-related symptoms such as excessive licking, hair loss, and greater frequency of ear infections.
If you look at the inspection frequency list for Ohio food service operators, there are various food places noted as needing inspections at least once during each licensing period.
Patience can be very hard to find, and the frequency with which one yells or cries can become increased.
Teaches the problems of driving without adequate sleep and aims to help reduce the frequency of this occurring.
In many cases, lifestyle changes effectively reduce the frequency and severity of snoring.
Before recommending anti-snoring devices or developing a treatment plan, your doctor will perform a medical examination and ask you and your partner questions about the frequency and severity of your snoring.
Effective treatment of these conditions generally reduces the frequency and intensity of snoring episodes.
The light is of a frequency that humans can't see.
The opposing players and "manager" AI routines learn your strengths and weaknesses and attempt to adapt to situations and run successful plays with greater frequency.
Guitar Hero is a rhthym game from Harmonix, the makers of Frequency and Amplitude.
Just when you were getting tired of moving your feet to the music, Harmonix, the company behind the fantastic Frequency and Amplitude, brings you Guitar Hero, a rhythm game that features, you guessed it, playing a guitar.
Games such as Frequency and Amplitude, for example, allow you to play along to popular rock songs while gliding along multi-colored tracks.
You can customize lots of game options, such as setting the power-up frequency and type.
Xizzle Beads are traded for Xizzles, which not only give your Urb special abilities and privileges, but depending on which Rep Group your Urb has been assigned to, Xizzles will also help decrease the frequency of filling your needs bars.
You can define the brightness of the light as well as the frequency of the strobe effect.
This is akin to the frequencies that you use with cordless phones in the home, except you're not exactly free to choose which frequency you want to use.
Because T-Mobile does not make use of the 850MHz frequency, reception may vary depending on where you are located.
The lower frequency typically has better range and penetration than the 1900MHz frequency.
There are also other ways to keep tabs on people without utilizing GPS; it's as simple as picking up the right frequency.
The problem with the phone is that it may emit more radio frequency output than what is allowed by official government standards.
In a neurosonogram, ultra high frequency sound waves are used to analyze blood flow and possible blockages in the blood vessels in or leading to the brain.
While listening to the heartbeat, the physician carefully evaluates several factors, including the loudness, frequency, pitch, duration, location, and timing of the murmur with the patient's heartbeat.
Drugs within a class may vary in their frequency and severity of adverse effects.
Aspirin should never be given to children under the age of 16 who have chickenpox or influenza, because children who have received aspirin for these conditions seem to have a higher than expected frequency of developing Reye's syndrome.
During this first phase, a woman's contractions typically increase in frequency and duration.
The frequency of forceps delivery varies from one hospital to the next, depending on the experience of staff and the types of anesthesia offered at the hospital.
It occurs with equal frequency in males and females.
The type and frequency of lies and the reasons why a child may be dishonest are also related to their stage of moral development.
The exact frequency of Tourette syndrome is unknown, but estimates range from 0.05 percent to 2 percent.
Not only is there extreme variability in symptoms among individuals with Tourette syndrome, but individuals commonly experience variability in type, frequency, and severity of symptoms over the course of their lifetime.
Several factors appear to affect the severity and frequency of tics.
Stress appears to increase the frequency and severity of tics, while concentration on another part of the body that is not involved in a tic can result in the temporary alleviation of symptoms.
Relaxation following attempts to suppress the occurrence of tics may result in an increased frequency of tics.
An increased frequency and severity of tics can also result from exposure to such drugs as steroids, cocaine, amphetamines, and caffeine.
Stimulants should be used with caution in individuals with Tourette syndrome, since they can sometimes increase the frequency and severity of tics.
Another third will experience a significant drop off in the severity and/or frequency of their symptoms during this time.
There does not appear to be a definite correlation between the type, frequency, and severity of symptoms and the eventual prognosis.
The frequency of multiple births in the United States has been steadily increasing with advances in reproductive technologies.
But if those blue or bad moods begin to interfere with schoolwork and daily living and start to increase in frequency, parents or caregivers need to seek help from their child's doctor.
It is distressing, but not life-threatening, and occurs with increased frequency in African Americans.
Good general health, especially good nutrition, can keep the immune system healthy, which decreases the frequency with which these colonies begin an infection or attack on the lung tissue.
It is found in populations all over the world (20,000-40,000 people have a type of the disease), and it occurs with equal frequency in males and females.
There have been occasional periods in history where the frequency of congenital amputations has increased.
The condition occurs with equal frequency in males and females (although the onset of symptoms is usually earlier in males).
When taken by mouth, acyclovir reduces the frequency of herpes outbreaks.
Individuals with A-T have an increased frequency of spontaneous breaks in their chromosomes as well as an increased frequency of chromosomal rearrangements.
The frequency of chromosomal breaks is increased when T-lymphocytes are exposed to x rays in the laboratory, and this sensitivity to ionizing irradiation forms the basis for a specialized A-T diagnostic test.
Those who carried a single "beneficial" mutation in the MEFV gene were more likely to survive and reproduce, which may explain the high carrier frequency (up to one in five) in some populations.
Each color in the spectrum delivers a frequency that reacts with the human temperament, causing subtle to noticeable changes in your mood and health over time.
For individual use, it all depends on the style and frequency of your practice.
The issued blink cards have embedded chips utilizing RFID or Radio Frequency Identification Tags that transmit information to a reader once they are waved within an inch of the reader's scanner.
The new frequency band on the block, rapidly replacing all older models.
The lower frequency 2.4-GHz DSS phones or some models with handset-to-handset talk capability may interfere with baby monitors and other wireless products operating on the same frequency.
Check the fine print for the frequency each model offers.
Because technology is rapidly changing, purchasing a cordless phone using a 2.4-Ghz frequency band isn't a good idea.
Even if a customer has provided an e-mail address, the type of correspondence, frequency of delivery and certain types of persistent messaging may drive customers away.
If interaction is very important to you, be sure to ask questions related to the types and frequency of communication when researching different programs.
The frequency with which you wipe your boards clean after regular use will have an impact on how often you need to use a cleaning solution on them.
The frequency with which you need to perform this task varies based on how frequently you use your grill for meal preparation.
The answer to "How much vinegar do I use to clean a coffee pot?" depends on its age and frequency of use as well as whether it has been previously cleaned.
Acceptance of coping with pain helps minimize the extent and frequency of a binge.
If you suffer any of these symptoms with regular frequency, it is important to talk with your doctor.
In addition to reducing the frequency and severity of acid reflux symptoms, a diet that embraces whole grains, lean proteins, and vegetables in a natural state will have numerous other health benefits.
Of course, you may have to adjust the intensity and frequency depending on your current physical condition and abilities.
Also, it is important to remember that the key to toning any part of the body is consistency, frequency, regularly changing routines, eating healthy and doing a balance of both cardio and strength training.
The frequency of how often you stretch is up to you, but it's best to include it as part of your regular exercise plan.
The frequency and duration of exercise depends both on what your physician recommends and what you can do without triggering symptoms.
Appropriate amounts of exercise, performed at a frequency which doesn't overtax you may help you to improve your quality of life with pulmonary hypertension.
Here again, insurance companies have statistics guiding them about the chances of an accident occurring in the zip code where the vehicle remains when not in use as well as the frequency and length of the vehicle's use.
This should include all the drugs you are currently taking along with dosages and frequency.
Destinations and frequency of trips contribute to the riskiness of travel insurance for people with health problems.
This is the absolute best way of getting a good fit, and if you are looking for an item you are going to wear with some frequency, it can be a good investment.
Despite the best efforts of the rest of the crew, she refuses to consider the suggestion that Suzee might exist only in her head - they live in parallel dimensions, she insists, and their brain waves happen to be on the same frequency.
It's through meditation that you raise your vibrational pattern to elevate your consciousness to a higher frequency that allows you to move between worlds.
Heat generated from a radio frequency device is used on the skin to tighten and lift.
Some investigations focus on a possible link between the frequency of aluminum-based antiperspirant usage, shaving underarms and the incidence of breast cancer.
By the 1950s, adding something to a bath was done with much more frequency, even by middle-class women, and those who were especially handy made extra to give to friends.
Excessive breakouts - If the frequency and severity of your breakouts is higher than usual, you may have acne.
There is even a section of the site where you can browse for users just like yourself by searching by gender, denomination, born again year, frequency of church attendance, dating status and other fields.
Subsequently, you provide the amount you earned in the current year, the frequency with which you are paid and the amount previously withheld from any other jobs held.
Further, most scrubs manufacturers recognize the frequency with which you may need to change.
Numerous attempts have been made to find periodic variations in thunderstorm frequency.
The female is viviparous, and the young, which, unlike the parent, are provided with a long tail, live free in water; it was formerly believed from the frequency with which the legs and feet were attacked by this parasite that the embryo entered the skin directly from the water, but it has been shown by Fedschenko, and confirmed by Manson, Leiper and others, that the larva bores its way into the body of a Cyclops and there undergoes further development.
To detect these currents some device has to be inserted in the antenna circuit or else inductively connected with it which is sensitive to high frequency currents.
Blair, in comparing the Greek and Roman systems of slavery, points with justice to the greater facility and frequency of emancipation as the great superiority of the latter.
Where, as in private herbaria, the specimens are not liable to be handled with great frequency, a stitch here and there round the stem, tied at the back of the sheet, or slips of paper passed over the stem through two slits in the sheet and attached with gum to its back, or simply strips of gummed paper laid across the stem, may be resorted to.
The frequency of blind passages and of circular chambers will be noticed, as well as the very large number of bodies in the cruciform recesses, apparently amounting in one in stance to nineteen.
Let x be the number of molecules which dissociate per second when the number of undissociated molecules in unit volume is unity, then in a dilute solution where the molecules do not interfere with each other, xp is the number when the concentration is p. Recombination can only occur when two ions meet, and since the frequency with which this will happen is, in dilute solution, proportional to the square of the ionic concentration, we shall get for the number of molecules re-formed in one second ye where q is the number of dissociated molecules in one cubic centimetre.
To heredity, as an indirect or predisposing cause, has probably been assigned too great importance, and the many facts brought forward of the relative frequency of cancer in members of one family only justify the conclusion that the tissue-resistance of certain families is lowered.
The frequency of these phenomena is in some degree a source of security, for the minor vibrations are believed to exercise a binding effect by removing weak cleavages.
It is particularly unfortunate that September should be the season of greatest typhoon frequency, for the earlier varieties of rice flower in that month and a heavy storm does much damage.
This creature displays an almost unexampled frequency and extent of distribution in the whole North Sea, in the western parts of the Baltic, near the Faroe Islands, Iceland, Greenland and the English coasts, so that it may be regarded as a characteristic North Sea echinoderm form.
The value of the dielectric constant is greatly affected by the temperature and the frequency of the applied electric force.
There is also a large difference in most cases between the value for a steadily applied electric force and a rapidly reversed or intermittent force-in the last case a decrease with increase of frequency.
There are very few substances, however, for which the optical refractive index has the same value as K for steady or slowly varying electric force, on account of the great variation of the value of K with frequency.
Thus pitch is a soft and yielding body under steady stress, but a bar of pitch if struck gives a musical note, which shows that it vibrates and is therefore stiff or elastic for high frequency stress.
Mill has shown that in the North Sea off the Firth of Forth the average depth of visibility of a disk in the winter half-year was 4; fathoms and in the summer half-year 62 fathoms, and, although the greater frequency of rough weather in winter might tend to obscure the effect, individual observations made it plain that the angle of the sun was the main factor in increasing the depth to which the disk remained visible.
The high cheek-bone and the hawk's bill nose are universally distributed in the two Americas; so also are proportions between parts of the body, and the frequency of certain abnormalities of the skull, the hyoid bone, the humerus and the tibia.
It arises mainly in statistics, when the ordinate of the trapezette represents the relative frequency of occurrence of the magnitude represented by the abscissa x; the magnitude of the abscissa corresponding to the median ordinate is then the " median value of x."
If the source makes n vibrations in one second it is said to have " frequency " n.
This is generally equal to the number of waves issuing from the source per second, and therefore equal to its frequency of vibration.
Experiments, which will be described most conveniently when we discuss methods of determining the frequencies of sources, prove conclusively that for a given note the frequency is the same whatever the source of that note, and that the ratio of the frequencies of two notes forming a given musical interval is the same in whatever part of the musical range the two notes are situated.
The maximum particle velocity is 21rna (where n is the frequency and a the amplitude), or 27raU/X.
But if an observer is stationed at S' the waves will be about half as far apart and will reach him with nearly twice the frequency, so that he hears a note about an octave higher.
A given note has always the same frequency, that is to say, the hearer receives the same number of waves per second whatever the source by which the note is produced.
Various instruments have been devised which produce any desired note, and which are provided with methods of counting the frequency of vibration.
The results obtained fully confirm the general law that " pitch," or the position of the note in the musical scale, depends solely on its frequency.
We shall now describe some of the methods of determining frequency.
Thecurrent being alternately transmitted and shut off, as a hole passes on and off the aperture of the tube or bellows, causes a vibratory motion of the air, whose frequency depends on the number of times per second that a perforation passes the mouth of the tube.
The relation between the pitch of a note and the frequency of the corresponding vibrations has also been studied by graphic methods.
If the two forks have the same frequency, it is easily seen that the figure will be an ellipse (including as limiting cases, depending on relative amplitude and phase, a circle and a straight line).
Koenig also used the apparatus to investigate the effect on the frequency of a fork of a resonating cavity placed near it.
But when the pitch of the cavity was exactly that of the fork when vibrating alone, though it resounded most strongly, it did not affect the frequency of the fork.
If the fork has slightly greater frequency, then a white line will not quite reach the next place while the fork is making its swing ip and out, and the waves will travel against the motion of the cylinder.
If the fork has slightly less frequency the waves will travel in the opposite direction, and it is easily seen that the frequency of the fork is the number of white lines passing a point in a second t the number of waves passing the point per second.
This apparatus was used to find the temperature coefficient of the frequency of forks, the value obtained - .00011 being the same as that found by Koenig.
The method is easily adapted for the converse determination of speed of revolution when the frequency of a fork is known.
In an experiment described by Rayleigh such a wheel provided with four armatures was used to determine the exact frequency of a driving fork known to have a frequency near 32.
But if the fork has, say, rather greater frequency, the hole in the wheel comes round at the end of the two seconds before the bead has quite come into position, and the two flashes appear gradually to move back in the opposite way to the pendulum.
If the clock is going exactly right, this gives a frequency for the fork of 32 + 4/N.
If the fork has rather less frequency than 32 then the flashes appear to move forward and the frequency will be 32 - 4/N.
If the frequency of o is n, that of N is 2n.
Any other fork within this octave can then have its frequency determined by finding the two between which it lies.
The membrane vibrates, and alternately checks and increases the gas supply, and the flame jumps up and down with the frequency of the source.
All experiments in frequency show that two notes, forming a definite musical interval, have their frequencies always in the same ratio wherever in the musical scale the two notes are situated.
At the other end of the scale with increasing frequency there is another limiting frequency somewhere about 20,000 per second, beyond which no sound is heard.
Koenig constructed a series of bars forming a harmonicon, the frequency of each bar being calculable, and he found the limit to be between 16,000 and 24,000.
Since U=n X where U is the velocity of sound, X the wave-length, and n the frequency, it follows that the forward frequency is greater than the backward frequency.
If the velocities of source and receiver are equal then the frequency is not affected by their motion or by the wind.
Now the amplitude evidently corresponds to the loudness, and the length of period corresponds to the pitch or frequency.
Each of them is supposed to have its own natural frequency, and to be set into vibration when the ear receives a train of waves of that frequency.
In the other, the waves produce a measurable effect on a vibrating system of the same frequency, and the amplitude in the waves can be deduced.
Each section then vibrates, and its amplitude goes through all its values in time given by 21rUT/A =2r, or T =A/U, and the frequency is U/A.
The vibrations of certain sources of sound may be represented, at least as a first approximation, as consisting of stationary waves, and from a consideration of the rate of propagation of waves along these sources we can deduce their frequency when we know their length.
In this case AH = 4X 1 =1, the length of the tube, and the frequency n1= U/X 1 = U/4 l.
In this case AK = 4X 2 =l, and the frequency n 2 = U/X 2 = 3U/4l.
In this case HK = 2X 1 =1, and the frequency is n i = U/X 1 = U/2l.
If U 4 is the velocity of longitudinal waves along the sounder, and 1 the length of the sounder, the frequency of vibration is U 8 /2l.
If U is the velocity of sound in a gas at pressure P with density p, and if waves of length X and frequency N are propagated through it, then the distanc?e l between the dust-heaps is 2 = N - zN Vyp' where y is the ratio of the two specific heats.
If d is measured for two gases in succession for the same frequency N, we have 72 p 2P1 d22 71 p i p s d12' where the suffixes denote the gases to which the quantities relate.
The first overtone has frequency 6.25 that of the fundamental, and is not in the harmonic series.
For an iron wire Y is about 10 12 /4, so that for a frequency of 500 in a wire fixed at both ends a length about 5 metres is required.
Young's modulus may be obtained for the material of a rod by clamping it in the middle and obtaining the frequency of the fundamental when Y = 412n2p.
If a rod is clamped at one end and free at the other, the fundamental frequency is (i/1)¦l (n/p).
For iron n/p is of the order 10 11, so that the frequency for a rod 1 metre long is about 3000.
But if a tuning-fork of appropriate frequency be set vibrating with its stalk in contact with the holder of the pipe from which the jet issues, the jet appears to go over in one continuous thread.
Intermittent illumination, however, with frequency equal to that of the fork shows at once that the jet is really broken up into drops, one for each vibration, and that these move over in a steady procession.
If we measure the time from an instant at which the two are in the same phase the resultant disturbance is y=a sin i t+a sin 27rn2t =2a cos ir(n i - n 2)t sin ir(nl-t-n2)t, which may be regarded as a harmonic disturbance of frequency (ni+n2)/2 but with amplitude 2a cos 7r(n i - n 2)t slowly varying with the time.
Taking the squares of the amplitude to represent the intensity or loudness of the sound which would be heard by an ear at the point, this is 4a 2 cos t ir(ni - n2)t =2a 2 {1 -cos 27r(n l - n2)t}, a value which ranges between o and 4a 2 with frequency .n1 - n2.
The frequency of beats giving maximum dissonance rises as we rise higher in the musical scale, and falls as we descend.
But Sauveur fixed the limiting number of beats for the discord far too low, and again he gave no account of dissonances such as the seventh, where the frequency of the beats between the fundamentals is far beyond the number which is unpleasant.
The first overtone of the second will beat 64 times per second with the third of the first, and at such height in the scale this frequency will be unpleasant.
Take as a further example the fifth with harmonic overtones as under The fundamental and overtones of the second either coincide with or fall midway between overtones in the first, and there is no approach to a dissonant frequency of beats, and the concord is perfect.
Thus, if a note of frequency 64 is sounded, and if all the successive overtones are present, the difference of frequency will be 64, and this is an unpleasant interval when we get to the middle of the scale, say to overtones 256 and 320 or to 512 and 576.
When two sources emit only pure tones we might expect that we should have no dissonance when, as in the major seventh, the beat frequency is greater than the range of harshness.
But the interval is still dissonant, and this is to be explained by the fact that the two tones unite to give a third tone of the frequency of the beats, easily heard when the two primary tones are loud.
There will be a tone frequency 480 - 256 =224, and this will be very dissonant with 256.
The tone of the frequency of the beats was discovered by Georg Andreas Sorge in 1740, and independently a few years later by Giuseppe Tartini, after whom it is named.
It is evident that we may have tones of frequency hn 1 kn 2 hn i - kn 2 hnl+kn2, where h and k are any integers.
The conditions assumed in this investigation are probably nearly realized in a harmonium and in a double siren of the form used by Helmholtz, and in these cases there can be no doubt that actual objective tones are produced, for they may be detected by the aid of resonators of the frequency of the tone sought for.
Peckham's main instrument was a minute system of "visitation," which he used with a frequency hitherto unknown.
There can be little doubt that, as in the case of all the other kingdoms of Further India, complete and detailed chronicles were compiled from reign to reign by order of her kings, but of the more ancient of these, the wars and disturbances which continued with such frequency down to quite recent times have left no trace.
The food must be as varied as possible, and special attention should be given to the frequency and quantity of the supply.
Quantities can be learned from experience, and from watching individual cases; frequency varies within very wide limits, from reptiles which at most may feed once a week and fast for long periods, to the smaller insectivorous birds which require to be fed every two or three hours, and which in the winter dark of northern latitudes must be lighted up once or twice in the night to have the opportunity of feeding.
The principal causes of variation in the individual are age, period of lactation, nature and amount of food, state of health, and treatment, such as frequency of milking, &c. The following table indicates the The average quantity of milk yielded by variable, both in individuals and breeds.
In the years assigned to the different judges, also, the frequency of the number 40 (which certainly appears to have been regarded by the Hebrews as a round number) is suspicious.
Notwithstanding the frequency of long, destructive droughts, cattle-raising is a preferred industry among the landowners of the northern states, and especially near the American frontier.
A remarkable feature of the Central-American ruins is the frequency of truncated pyramids built of hewn stone, with flights of steps up to the temple built on the platform at top. The resemblance of these structures to the old descriptions and pictures of the Mexican teocallis is so striking that this name is habitually given to them.
It can be shown mathematically that the velocity of propagation will be greatly increased if the frequency of the light-wave is slightly greater, and greatly diminished if it is slightly less than the natural frequency of the molecules; also that these effects become less and less marked as the difference in the two frequencies increases.
Hot wire voltmeters, like electrostatic voltmeters, are suitable for use with alternating currents of any frequency as well as with continuous currents, since their indications depend upon the heating power of the current, which is proportional to the square of the current and therefore to the square of the difference of potential between the terminals.
In a south-western section the crystalline belt again assumes importance in breadth and height, and the plateau member maintains the strength that it had in the middle section, but the intermediate stratified belt again has fewer ridges, -because of the infrequence here of ridge-making strata as compared to their frequency in the middle section.
In wintertime, the cyclonic and anticyclonic areas are of increased frequency and intensity; and it is partly for this reason that many meteorologists have been disposed to regard them as chiefly driven by the irregular flow of the westerly winds, rather than as due to convectional instability, which should have a maximum effect in summer.
Notwithstanding the facility and frequency of amendments, the variations between one constitution and another are less conspicuous than might have been expected.
If N be the frequency of a homogeneous vibration sent out by a molecule at rest, the apparent frequency will be N (1 v/ V), where V is the velocity of light and v is the velocity of the line of sight, taken as positive if the distance from the observer increases.
If all molecules moved with the velocity of mean square, the line would be drawn out into a band having on the frequency scale a width 2Nv/V, where v is now the velocity of mean square.
We may therefore still take 2Nu/V to be the width of the band if we define its edge to be the frequency at which its intensity has fallen to 22% of the central intensity.
Balmer, who showed that the four hydrogen lines in the visible part of the spectrum may be represented by the equation n = A(i - 4/s2), where n is the reciprocal of the wave-length and therefore proportional to the wave frequency, and s successively takes the values 3, 4, 5, 6.
The most complete hydrogen spectrum is that measured by Evershed 8 in the flash spectrum observed during a total solar eclipse, and contains thirty-one lines, all of which agree with considerable accuracy with the formula, if the frequency number n is calculated correctly by reducing the wave-length to vacuo.9 It is a characteristic of Balmer's formula that the frequency approaches a definite limit as s is increased, and it was soon discovered that in several other spectra besides hydrogen, series of lines could be found, which gradually come nearer and nearer to each other as they become fainter, and approach a definite limit.
The present writer, therefore, in his Theory of Optics, adopted different names, and called the series respectively the " Trunk," the " Main Branch " and the " Side Branch," the main branch being identical with the second subordinate series; the limit of frequency for high values of s is called the " root " of the series, and it is found in all cases that the two branches have a common root at some point in the trunk.
According to an important law discovered by Rydberg and shortly afterwards independently by the writer, the frequency of the common root of the two branches is obtained by subtracting the frequency of the root of the trunk from that of its least refrangible and strongest member.
In fact the lines of each branch are also doublets, with common difference of frequency.
These forms all agree in making the frequency negative when s falls below a certain value sp. Rydberg's second law states that if the main branch series is taken, the numerical value of np_I corresponding to sp_ I is equal.
Roughly speaking the difference in frequency is proportional to the square of the atomic weight.
The spectra of magnesium, calcium, zinc, cadmium and mercury, give the two branch series, and each series is repeated three times with constant difference of frequency.
If s represents the series of integer numbers the distribution of frequency may be represented by C+Bs2, where C and B are constants.
The distance between the lines measured on the frequency scale does not, according to the equation, increase indefinitely from the head downwards, but has a maximum which, in Pickering's form as written above, is reached when (s +, u) 2 = 3a.
If a is negative the frequency passes through infinity and the maximum distance between the lines occurs there.
If a negative value of the frequency is admitted, more complicated effects may be predicted.
The change of frequency (dn) for a series of lines which behave similarly is approximately proportional to the frequency (n) so that we can take the fraction do/n as a measure of the shift.
Schuster suggested that the proximity of molecules vibrating in the same period might be the cause of the diminished frequency, and suggested that according to this view the shifts would be similar if the increase of density were produced by the presence of molecules of a different kind from those whose lines are being examined.
The question is complicated by the fact that in the cases which have been observed, the greater portion of the metallic vapour vibrates in an atmosphere of similar molecules, and the static energy of the field is determined by the value of K applicable to the particular frequency.
Close to and on either side of the absorptive band µ 2 has large positive and negative values, and if the above expression remains correct the change of frequency would, close to the centre of absorption, be 2 k-2"+3, which for n =3 and k= Io is 1/2000, or 500 times greater than the observed shifts, but this represents now the maximum displacement and not the displacement of the most intense portion of the radiation.
Preston that all the lines of the same series show identical effects when measured on the frequency scale, arfrl the fact recently announced by Runge 3 that even in the more complicated cases mentioned some simple relation between the distances of the components exists.
Such bodies are said to be fluorescent, the degradation of motion towards that determined by its temperature gives rise to the law of Stokes, the fluorescent light being in nearly all cases of lower frequency than the incident light.
The author, no doubt correctly, remarks that the shift does net indicate a change of frequency but a change of relative intensity, consisting of a great number of fine lines; when the maximum intensity of the distribution of light is altered, the appearance is that of a shift.
The tendency of recent years has been towards a decrease both in the number and in the frequency of elections.
Excluding this small group, the frequency of the occurrence of these suffixes in ancient Italy is shown by the following table.
There remain, therefore, the three suffixes -co-, -no-, and -ti-, and it will be seen from the table that the relative frequency of these suffixes in different dialect-areas varies very greatly.
With the introduction of Christianity the ecclesiastical connexion between England and the continent without doubt brought about a large increase in the imports of secular as well as religious objects, and the frequency of pilgrimages by persons of high rank must have had the same effect.
The visible symptom of this decadence of the archiepiscopal power was the growing frequency during the Hildebrandine conflict of episcopal confirmations and consecrations made by the popes themselves or their legates.
It was occasionally styled the Windy or Windward coast, from the frequency of short but furious tornadoes throughout the year.
The lichen flora of temperate regions again is essentially distinguished from the preceding by the frequency of corticolous species belonging to Lecanora, Lecidea and Graphidei.
Owing to the frequency of earthquakes, many houses were built of wood, and in 1847 fully a quarter of the city was laid waste by fire.
Thunderstorms are frequent and occasionally very severe, between May and September; the annual average of thunderstorms for the decennium1888-1897was 505, the greatest frequency was in May (average 100.3) and in June (average 90.7); the severity of these storms may be imagined from the fact that in a half-hour between 5 and 6 p.m.
As an accident of pregnancy, it is far from uncommon, although its relative frequency, as compared with that of completed gestation, has been very differently estimated by accoucheurs.
Those who maintain the impunity of the practice rely for their authority upon certain passages in the classical authors, which, while bitterly lamenting the frequency of this enormity, yet never allude to any laws by which it might be suppressed.
To illustrate the main features of the calculation, we may suppose that the surface is subject to a simple-harmonic cycle of temperature variation, so that the temperature at any time t is given by an equation of the form 0 - 0 0 = Asin 27rnt= A sin 27rt/T, (5) where 0 0 is the mean temperature of the surface, A the amplitude of the cycle, n the frequency, and T the period.
In the southern hemisphere there is comparatively little inhabited land in high latitudes and observational data are few; thus little is known as to how the frequency varies with latitude and longitude.
The Scandinavian data, from the wealth of observations, are probably the most representative, and even in the most northern district of Scandinavia the smallness of the excess of the frequencies in December and January over those in March and October suggests that some influence tending to create maxima at the equinoxes has largely counterbalanced the influence of sunlight and twilight in reducing the frequency at these seasons.
At most places the variation in the frequency has shown a general similarity to that of sun-spots.
During the period 1764 to 1872 there have been ten years of maximum, and ten of minimum, in sun-spot frequency.
Taking the three years of greatest frequency at each maximum, and the three years of least frequency at each minimum, we get thirty years of many and thirty of few sun-spots.
The mean sun-spot frequency for the group of years of few sun-spots is almost exactly the same for the two subperiods, but the auroral frequency for the later group is nearly 40% in excess of that for the earlier, and even exceeds the auroral frequency in the years of many sun-spots in the earlier sub-period.
It is almost certainly due in large measure to a progressive change in one or both of the units of frequency.
Wolf and Wolfer have, however, aimed persistently at securing a definite standard, and there are several reasons for believing that the change of unit has been in the auroral rather than the sun-spot frequency.
Rubenson (14), from whom Tromholt derives his data for Sweden, seems to accept this view, assigning the apparent increase in auroral frequency since 1860 to the institution by the state of meteorological stations in 1859, and to the increased interest taken in the subject since 1865 by the university of Upsala.
There has been at least one 33-year period during which the mean value of sun-spot frequency has been exceptionally low, and, as we shall see, there was a corresponding remarkable scarcity of auroras.
Greenland lies to the north of Fritz's curve of maximum auroral frequency, and the suggestion has been made that the zone of maximum frequency expands to the south as sun-spots increase, and contracts again as they diminish, the number of auroras at a given station increasing or diminishing as the zone of maximum frequency approaches to or recedes from it.
In the northern hemisphere to the south of the zone of greatest frequency, the part of the sky in which aurora most generally appears is the magnetic north.
The relative frequency in the two positions seems to vary with the hour, the type of aurora, probably with the season of the year, and possibly with the position of the year in the sun-spot cycle.
This seems the more common direction in the northern hemisphere, at least for stations to the south of the zone of maximum frequency, but a considerable preponderance of movements towards the north was observed in Franz Joseph Land by the Austrian Expedition of 1872-1874.
The fact that at most places the morning shows a marked decay of auroral frequency and intensity as compared to the evening, the maximum preceding midnight by several hours, is certainly favourable to theories which postulate ionization of the atmosphere by some cause or other emanating from the sun.
They increase in frequency until they merge in the heavy rains which last from July to October.
Fifty years later the Danes begin to be mentioned with comparative frequency in continental annals.
Navigation is dangerous owing to the frequency and violence of the storms, and the almost total absence of shelter.
The north-east winds acquire their greatest frequency from March to June and in November, which are accordingly the driest portions of the year.
As an example of extreme asymmetry we may take de Vries's record of the frequency with which given numbers of petals occur in a certain race of buttercups.
Trans., A., 1893) that this frequency may be closely represented by the curve whose equation is y = O.21 122 5 x-( 332 (7.3 2 53 - x) 3.142.
The number of leaves gathered from each tree was 26, and the frequency of leaves with any observed number of veins in the whole series of 2600 leaves was.
The partiality for the chase which the ancient Egyptians manifested was shared by the Assyrians and Babylonians, as is shown by the frequency with which hunting scenes are depicted on the walls of their temples and palaces; it is even said that their 1 See on this whole subject ch.
The addiction of the Franks in later centuries to the chase is evidenced by the frequency with which not only the laity but also the clergy were warned by provincial councils against expending so much of their time and money on hounds, hawks and falcons; and we have similar proof with regard to the habits of other Teutonic nations subsequent to the introduction of Christianity.
Dark hair and brown or hazel eyes are the rule; blue-eyed blonds are found, but their frequency has been considerably overstated.
Growing under the shade of these are several varieties of rose, honeysuckle, currant, gooseberry, hawthorn, rhododendron and a luxuriant herbage, among which the ranunculus family is important for frequency and number of genera.