Periodic Sentence Examples
Numerous attempts have been made to find periodic variations in thunderstorm frequency.
His name is best known for the share he had in the periodic classification of the elements.
His name is best known for his work on the Periodic Law.
Although the periodic outbursts of light have taken place without intermission during the two and a half centuries that the star has been under observation, they are somewhat irregular.
Antiperiodics inhibit a disease having periodic recurrences; e.g.Advertisement
It is natural to compare the periodic outbursts occurring in these stars with the outbursts of activity on the sun, which have a period of about eleven years.
It is therefore perhaps misleading actually to class the sun with them; but it seems highly probable that whatever cause produces the periodic outbursts of spots and faculae on our sun differs only in degree from that which, in stars under a different physical condition of pressure and temperature, results in the gigantic conflagrations which we have been considering.
Except when the line of sight is perpendicular to the plane of the orbit, the revolution of the two bodies will result in a periodic variation of the motion in the line of sight.
If both the bodies are luminous, especially if they do not differ much in brilliancy, the motion of revolution is shown by a periodic doubling of the lines of the spectrum; when one body is moving towards us and the other away their spectral lines are displaced (according to Doppler's principle) in opposite directions, so that all the lines strong enough to appear in both spectra appear double; when the two bodies are in conjunction, and therefore moving transversely, their spectra are merged into one and show nothing unusual.
More usually, however, only one component is sufficiently luminous for its spectrum to appear; its orbital motion is then detected by a periodic change in the absolute displacement of its spectral lines.Advertisement
The occurrence of change, either periodic or irregular, in the colour of individual stars, has been suspected by many observers; but such a colour-variability is necessarily very difficult to establish.
It is, the orbit and periodic time is known, and also the parallax, the masses of the stars can be found.
In its salts, thorium is tetravalent, and in the periodic classification it occurs in the same sub-group as titanium, cerium and zirconium.
Mendeleeff and other workers into the Periodic Law, has taken its place as one of the most important generalizations in modern chemical theory.
He collected his various papers on the atomicity of the elements in a little volume on the Discovery of the Periodic Law published in London in 1884.Advertisement
We learn that if the orbital motion of a planet, or a satellite, were arrested, the body would fall into the sun, or into its primary, in the fraction 0.1768 of its actual periodic time.
To find the forced oscillation due to a periodic force we have tl+k+ux-f cos(rjt+e).
This would cause a periodic variation in the latitude of any place on the earths surface, as determined by astronomical methods.
There appears to be evidence of a slight periodic variation of latitude, but the period would seem to be about fourteen months.
Suppose we have an inductive and a non-inductive circuit in series, which is traversed by a periodic current, and that we desire to know the power being absorbed to the inductive circuit.Advertisement
If b 2 /a 2, 3 /a 3 ..., the component fractions, as they are called, recur, either from the commencement or from some fixed term, the continued fraction is said to be recurring or periodic. It is obvious that every terminating continued fraction reduces to a commensurable number.
The most interesting kind of periodic inequalities are those known as " terms of long period."
The longitudes, latitudes and radii vectores of a planet, being algebraically expressed as the sum of an infinite periodic series of the kind we have been describing, it follows that the problem of finding their co-ordinates at any moment is solved by computing these expressions.
The Babylonian computers were not only aware that Venus returns in almost exactly eight years to a given starting-point in the sky, but they had established similar periodic relations in 4 6, 59, 79 and 83 years severally for Mercury, Saturn, Mars and Jupiter.
A periodic character was thus indicated for the disturbance; and Laplace assigned its true cause in the near approach to commensurability in the periods of the two planets, the cycle of disturbance completing itself in about goo (more accurately 929) years.Advertisement
Sir George Airy detected in 1831 an inequality, periodic in 240 years, between Venus and the earth.
Lakes of the broad type are of moderate depth, the deepest sounding in [[Victoria (disambiguation)|Victoria ]] being under 50 fathoms. Apart from the seasonal variations of level, most of the lakes show periodic fluctuations, while a progressive desiccation of the whole region is said to be traceable, tending to the ultimate disappearance of the lakes.
The periodic fluctuations in the level of Lake Tanganyika are such that its outflow is intermittent.
Not the equal of Caesar or Augustus in genius or in the lastingness of his work, he yet recalls them in his capitularies, his periodic courts, his official hierarchy, his royal emissaries, his ministers, his sole right of coinage, his great public works, his campaigns against barbarism and heathenry, his zeal for learning and literature, and his divinity as emperor.
Astronomers were only then beginning to study variable and periodic stars, and disturbances in that part of the heavens, which had till then, on the authority of Aristotle, been regarded as incorruptible, combined with the troubles of the times, must have given a new stimulus to belief in the signs in heaven.
A second error can arise through the inaccuracy of the eyepiece micrometer, and also in the case of a screw micrometer through periodic faults of the screw, and through dead motion.
About the end of the 19th century research showed that there actually was a very minute but measurable periodic change of this kind.
The concentric rings of growth, which form a characteristic feature, are due to periodic variations in the size of the larger tubes.
In this brief tract, Kant, apparently in entire ignorance of the explanation given in 1735 by Hadley, points out how the varying velocity of rotation of the successive zones of the earth's surface furnishes a key to the phenomena of periodic winds.
In the Hospitalier ondograph, 1 a synchronous electric motor driven in step with the periodic current in the circuit being tested drives a cylinder of insulating material having a metallic slip let into its edge.
They consist essentially of a galvanometer of which the needle or coil has such a short natural periodic time that it can follow all the variations of a current which runs through its cycle in say i;nth second.
This ray is also given a periodic motion of the same frequency by reflection from a separate oscillating mirror so as to make the two motions at right angles to one another, and thus we have depicted on the screen a bright line having the same form as the periodic current being tested.
In this instrument the periodic current, the time variation of which is being studied, passes through a pair of fine wires or strips, going up one wire and down the other.
The customer has the right to carry out periodic audits at times mutually agreeable to both parties.
The post will require periodic attendance outside normal working hours.
The PEIT sector has experienced periodic bouts of heightened share price volatility.
Set a periodic checkpoint effective for restarting the parent request automatically.
Following a section on normed linear spaces, we will consider periodic approximation using classical Fourier series.
The transition matrices of periodic Markov chains have eigenvalues on the unit circle.
Where glider means a periodic structure moving through time on a periodic background called ether by Cook.
On the other hand, control of these chaotic motions is also studied by applying a parametric periodic excitation.
The next week we had three of our planes in our main hanger for periodic inspection.
During a polymer injection molding process, an unexpected periodic pattern is often observed on a molded product surface.
A never-ending task is ensuring our Class VI fleet is up to standard with annual tests and periodic inspections.
It brings spiritual poverty, obesity, social isolation, covert competition, satiation, heartlessness and periodic nervous breakdown.
Ask your health care provider if you need to have periodic Pap tests.
The triply periodic structure is generated by reflections in the faces of the rhombic dodecahedron.
Davenport was most attracted by Littlewood ' s lectures on the theory of primes and those of Besicovitch on almost periodic functions.
Quasicrystals are surprising because the arrangement of their atoms is regular but not periodic.
If the tenancy becomes periodic what are the minimum notice requirements from the tenant?
This sort of analysis would require periodic, regular attitude research with members of the public.
This includes periodic stripping and polishing of hard floors and carpet cleaning.
Inventories will need periodic updating (see the requirements of the information sub group ).
Resonance A state in which an orbiting object is subject to periodic gravitational perturbations by another.
The periodic timing of natural events in response to climate is called phenology.
The main 26,000-year effect is called luni-solar precession; the smaller, faster, periodic terms are called the nutation.
We discuss possible experimental realizations in the form of periodic series of light pulses interacting with the BEC.
Yes I Periodic and year-end bank account reconciliations were properly carried out.
The NAQS has been subject to periodic review, with consultation documents being published in 1998 and 1999 (DETR 1998a, 1999 ).
A porous material, marble requires proper periodic resealing with a penetrating sealer to prevent staining.
Amorphous silicon, a solid in which atoms are arranged in a non- periodic jumble, rivals crystalline silicon for photovoltaic applications.
The battle settled down into a long, hard slog gaining small amounts of ground in periodic smaller scale attacks.
Periodic tenancies continue on a monthly basis from the start of the tenancy.
Baseline and periodic complete urinalysis and BUN determinations are recommended.
Also more complicated periodic solutions will also be sought which visit the vicinity of a number of coherent states.
The patient may experience periodic elevations of liver enzymes and persistent viremia for several years.
The periodic shedding of the tip vortex at the blade tip is also observed in vorticity contour plots measured at the of axial planes.
Scale deposits are broken down into sludge and are easy to remove at periodic boiler washouts.
The existence of the periodic law (see Element), and the 1 Freund, The Study of Chemical Composition.
The determination of the motion in the aether, due to the action of a periodic force at a given point, is discussed in the article Diffraction Of Light (§ Ii).
The two micrometer screws shall be without sensible periodic or other error, and exactly alike in pitch.
If the fluctuations are irregular and non-periodic, teristics the sound is called a noise; if they are cyclic and follow a regular and sufficiently rapid periodic law, the sound is musical.
Passing by Buddhism, which, though teaching the periodic destruction of our world by fire, &c., does not seek to determine the ultimate origin of the cosmos, we come to those early Greek physical philosophers who distinctly set themselves to eliminate the idea of divine interference with the world by representing its origin and changes as a natural process.
The remarkable phenomenon of the periodic Turkestan shifting of the Lop Nor system has been revealed by the and Oxus researches of Sven Hedin, and the former existence of basin.
Its principle was exactly house, that of the clearing houses used by the railways and the oat to n nk an d banks, the cancellation of indebtedness and discharge periodic s i mply of balances.
Periodic settlements are obviously periodic tests of the solvency of dealers.
Newlands in England, that if they are arranged in the order of their atomic weights they fall into groups in which similar chemical and physical properties are repeated at periodic intervals; and in particular he showed that if the atomic weights are plotted as ordinates and the atomic volumes as abscissae, the curve obtained presents a series of maxima and minima, the most electro-positive elements appearing at the peaks of the curve in the order of their atomic weights.
Dulong and Petit's law thus points to the value 114, which is also supported by the position occupied by this element in the periodic classification.
The present organization of the Quaker church is essentially democratic; every person born of Quaker parents is a member, and, Periodic together with those who have been admitted on their own Periodic request, is entitled to take part in the business assemblies ."
So far only the North Atlantic has been at all well studied and evidence of seasonal and periodic variations extending over a number of years has been obtained in this area.
Now it is probable that the main cause of oceanic circulation is the driving force of the winds upon the superficial layers of water; hence periodic and irregular changes in the direction and velocities of ocean currents are probably due to changes in atmospheric circulation traceable to changes in the quantities of heat absorbed from the sun by the earth's atmosphere.
The ratio between the limiting angles subtended by the periodic structure of the gauze and the diameter of the wire was (022/ 034) X (240/17) = 9 I.
The curve is periodic, and cuts the axis of x at the points x= (2n - I)a, n being an integer; the maximum values of y are =a.
Opposite the Glyptothek stands the exhibition building, in the Corinthian style, it was finished in 1845, and is used for periodic exhibitions of art.
From the regular progression of the lines in the X-ray spectra of different elements Moseley was able tc indicate the number of elements yet to be discovered, and he cleared up certain anomalies in the periodic tables of the elements.
According to its position in the periodic classification of the elements one would expect its atomic weight to be less than that of iodine, instead of approximately equal, and on this account many efforts have been made to isolate another element from tellurium compounds, but none have as yet been successful.
In its chemical relationships tantalum is associated with vanadium, columbium and didymium in a sub-group of the periodic classification.
Distortion of the ocean surface may also arise from meteorological causes, and be periodic or unperiodic in its occurrence, but it does not amount to more than a few feet at the utmost.
Periodic variations of level due to meteorological causes account for the Baltic being fuller in the time of the summer rains than in winter, when the rivers and lakes are frozen and most of the precipitation on the land is in the form of snow.
It was especially used to represent geometrically the periodic apparent retrograde motion of the outer planets, Mars, Jupiter and Saturn, which we now know to be due to the annual revolution of the earth around the sun, but which in the Ptolemaic astronomy were taken to be real.
Aquickvariation, or a periodic variation of the magnitude of the force or torque transmitted through the springs, tends to set up oscillations, and this tendency increases FIG.
The three characteristics of a longitudinal periodic disturbance are its amplitude, the length after which it repeats itself, and its form, which may be represented by the shape of the displacement curve.
Any periodic curve may be resolved into sine or harmonic curves by Fourier's theorem.
It follows from this that any periodic disturbance in air can be resolved into a definite series of simple harmonic disturbances of wave-lengths equal to the original wave-length and its successive submultiples, and each of these would separately give the sensation of a pure tone.
The question now arises whether the sensation produced by a periodic disturbance can be analysed in correspondence with this geometrical analysis.
Using the term " note " for the sound produced by a periodic disturbance, there is no doubt that a well-trained ear can resolve a note into pure tones of frequencies equal to those of the fundamental and its harmonics.
This resonance is a particular example of the general principle that a vibrating system will be set in vibration by any periodic Forced VI force applied to it, and ultimately in the period of the force, its own natural vibrations gradually dying down.
In order that the vibration may be maintained, a periodic force must be applied either to aid the internal restoring force on the return journey, or weaken it on the outgoing journey, or both.
But it is very difficult to suppose that the same sensation would be aroused by a truly periodic displacement represented by a smooth curve, and a displacement in which the period is only in the amplitude of the to-and-fro motion, and which is represented by a jagged curve.
As the oscilla swung in the wind, oscillare came to mean to swing, hence in English "oscillation," the act of swinging backwards and forwards, periodic motion to and fro, hence any variation or fluctuation, actual or figurative.
A gun may be considered a simple thermo-dynamic machine or heat-engine which does its work in a single stroke, and does not act in a series of periodic cycles as an ordinary steam or gas-engine.
But popular phraseology did not conform to this canon, and comitia, which gained in current Latin the sense of "elections" was sometimes used of the assemblies of the Halley concluded that all the three orbits belonged to the same comet, of which the periodic time was about 76 years.
He has equal command over the "periodic" style (Karevrpaµ/Avrt)4(.3) and the non-periodic or "continuous" (eI po thvit, btaX€Xv,ubn).
In his researches, Roscoe showed that the atomic weight of the metal as determined by Berzelius and the formulae given to the oxides were incorrect, and pointed out that the element falls into its natural place in group V of the periodic classification along with phosphorus and arsenic, and not in the chromium group where it had originally been placed.
The United Kingdom has just completed its periodic exercise in representational democracy.
In addition, liquid-in-glass thermometers and platinum resistance thermometers require periodic checking of reference points.
The NAQS has been subject to periodic review, with consultation documents being published in 1998 and 1999 (DETR 1998a, 1999).
We extend the semiclassical theory of scarring of quantum eigenfunctions by classical periodic orbits to include situations where these orbits undergo generic bifurcations.
Ideally if you want to run a solvated system you should use periodic boundaries.
A notice to determine a periodic tenancy is not in my view equivalent to the assignment or surrender of that tenancy.
Our method can be seen as a direct generalization of methods for periodic orbit continuation and it is extensible to tori of arbitrary dimension.
In order to determine periodic unprotected tenancies and restricted contracts, notice to quit must first be served.
The most frequently used example is the unstable manifold of a periodic orbit that just lost its stability in a period-doubling bifurcation.
They may need periodic tightening thereafter.
Remember that cheaper alternatives will ultimately cost you more in the long term because they will have a shorter lifespan and you will incur periodic repair and maintenance costs.
Opals require periodic oiling in order to keep the water content intact and protected.
However, you may be able to offset this risk by doing a lot of research and becoming an educated investor, or by consulting with a financial planner on a periodic basis to see if you are on track to meet your investment goals.
If a shower doesn't last long enough to really clean everything out of the air and off your cushions, give them a light scrubbing with a mild soap and water, or follow the manufacturer's instructions for periodic cleaning.
Particularly popular is the periodic evening candlelight tour.
Remember that any traffic information called up is at that moment, so periodic web page refreshing is required to get the most accurate information.
Once you do this, you can sign up to receive email notifications for periodic free print offers.
These same students don't like to memorize lists such as The Periodic Table of Elements and feel the need to cheat in these instances.
Lastly, the periodic table of elements is discussed and memorized.
Plan periodic meetings with her so that you both can discuss any changes or additions that you'd like.
Curbly, a DIY site, offers curtains featuring the periodic table, pirate flags and the Brooklyn Bridge.
The Periodic Table of the Elements - for those who like to brush up on their science while cleansing.
A cool curtain could feature an old-time cartoon or comic strip character, or something that speaks to you as an intellectual, like the periodic table of the elements.
From curtains printed with the periodic table of elements to curtains topped with trendy ruffles.
Some community churches hold periodic clothing exchanges, and this is another good way to find serviceable, pre-owned Oshkosh apparel.
Periodic "repositioning" cruises are also offered, that is cruises which take a ship from one part of the world to another, such as a transatlantic voyage.
Daily attention and periodic professional grooming is required.
Prevention, Compliance, Screening and Periodic Testing outlines the latest recommendations for how to educate pet owners to prevent heartworm disease infections in their pets.
Periodic resealing may be recommended to help keep the counter from staining over prolonged use.
Their operation is subject to periodic inspections to ensure compliance.
Some elderly women opt for a hairstyle that requires a periodic salon service such as a perm or body wave.
Chiropractors, acupuncturists, and massage therapists may provide a 10-minute demonstration of their services, and explain the benefits of receiving periodic treatments.
In general, management companies conduct periodic site visits to ensure that the owners of the facility, the employees and the residents' needs are being met and the facility is being run as efficiently and cost effectively as possible.
Most over-the-counter products help reduce episodic or periodic insomnia, but are not a treatment for chronic insomnia or other sleep disorders.
Hartford Memorial Hospital's Sleep Disorder Center offers help for people who have a number of sleep problems, including sleep apena, narcolepsy and periodic limb movement disorder.
Patients may think that they are getting a full night's sleep because they are unaware of the periodic arousal that interferes with sleeping.
Jerking in sleep may also be referred to as periodic limb movements of sleep (PLMS).
Periodic visits may be necessary to adjust the treatment or make minor revisions to the treatment.
Only a dentist can design and fit a dental appliance, and use of these anti-snoring aids requires periodic evaluation to ensure proper fit.
Periodic limb movement disorder involves involuntary muscle spasms but not the intense cramping sensation associated with nighttime leg cramps.
Over the counter sleep aids are available to help you with periodic sleep problems.
Periodic limb movement disorder, is a condition that causes excessive jerking twtiching movements.
However, if the problem interferes with sleep significantly, it is important to discuss the problem with your doctor to rule out conditions like periodic limb movement disorder.
Watch Overstock for periodic promotions of minimal or no shipping charges to save even more from this site.
Spooky music plays continuously, while periodic shows such as monster parties and spooky sing-a-longs are fun options for everyone.
Just as with other current sports games, Madden NFL 10 will receive periodic roster updates from EA sports.
Just as you are able to do with the Madden NFL games, it is possible to get periodic updates from Electronic Arts that effectively bring your in-game NHL 10 rosters into the current day.
A quick and periodic Google search on titles you are interested in reveals other titles when they are ready.
Campers may also want to take advantage of periodic educational and cultural programs offered at the park.
You can request to receive periodic email updates, assuring you of becoming the first to learn about new Signature Resorts developments.
Doing this can help keep the roof from becoming stained, resulting in a more attractive appearance and easier periodic cleanings.
Along with routine medical care and standard immunizations, periodic heart check-ups are necessary in children who have congenital cardiovascular defects.
People who are at an increased risk for developing leukemia because of proven exposure to ionizing radiation or exposure to the toxic liquid benzene, and people with Down syndrome, should undergo periodic medical checkups.
Periodic vaginal exams are performed by the physician or nurse to determine progress.
Patients who have leukemia, polycythemia vera, or aplastic anemia are given periodic platelet count tests to monitor their health.
Other disorders in this group are TNF-receptor associated periodic syndrome (TRAPS), hyper-IgD syndrome (HIDS), and familial Hibernian fever.
Similar syndromes of periodic fever and inflammation include familial Hibernian fever and hyperimmunoglobulinemia D syndrome, but both are much less common than FMF.
Along with routine medical care and standard immunizations, periodic heart check-ups are necessary.
As an example of gene therapy for SCID children with ADA deficiency, the child receives periodic infusions of his or her own T cells corrected with a gene for ADA that has been implanted in an activated virus.
Seventeen percent of these students reported medical complications from the piercing, ranging from skin or cartilage infections to periodic bleeding from the nose.
Nasal injuries from piercing include bacterial infections of the skin and nasal cartilage, allergic reactions to the jewelry, tissue damage, and periodic bleeding.
The rapidity with which decay can advance in baby teeth necessitates periodic dental examinations and cleanings.
Also sometimes called periodic limb movement disorder.
Periodic limb movement disorder-A disorder characterized by involuntary flexion of leg muscles, causing twitching and leg extension or kicking during sleep.
Children who have been diagnosed with retinoblastoma should receive periodic dilated retinal examinations until the age of five.
After five years of age, periodic eye examinations are recommended.
It may be advisable for patients with bilateral retinoblastoma or an inherited form of retinoblastoma to undergo periodic screening for the brain tumors found in trilateral retinoblastoma.
It is also recommended that siblings continue to undergo periodic retinal examinations under anesthetic until they are three years of age.
For children three to seven years of age, periodic eye examinations are recommended.
The children of someone diagnosed with retinoblastoma should also undergo periodic retinal examinations under anesthetic.
Children or young adults with thalassemia major may require periodic hospitalization to receive blood transfusions or, in some cases, bone marrow transplants.
For people being treated for cancer, periodic relief from chemotherapy drugs can restore the function of the immune system.
A periodic alternating nystagmus (PAN) is observed in primary gaze when the patient is looking straight ahead and is characterized by eye movements that continuously change direction and speed.
Injections involve very small but gradually increasing amounts of allergen, over several weeks or months, with periodic boosters.
To prevent serious side effects, the child will have periodic monitoring tests.
Among the current alcohol users, 28.3 percent had five or more drinks on at least one occasion, suggesting that a sizeable proportion of the students are periodic heavy drinkers.
Many of these children continue to have periodic flares of fever and systemic symptoms throughout childhood.
Dosing should be based on kidney function, with periodic testing of both kidney function and hearing.
Periodic medical monitoring is necessary to detect side effects in people who use such preparations on rashes covering large areas of the body.
States require inspection on a periodic basis, usually every one to two years, as well as in response to consumer complaints.
If they are approved, you'll be required to comply with the state's periodic reporting requirements to verify continued eligibility throughout the period of time you are initially approved to receive payments.
Customers can also sign up for periodic updates regarding escrow information and other announcements straight from National City Mortgage.
Natural Family Planning -- Also known as fertility awareness or periodic abstinence, this method works by abstaining from intercourse on the days when a woman is ovulating.
You may also need to provide periodic updates, again signed by your doctor.
After that, you can purchase your suits online if you choose, although it may be a good idea for growing kids and teens to return to the dealer for periodic fittings.
Using solid vent pipe, instead of the flexible type, and a properly functioning vent cap, and conducting periodic vent cleaning will restore optimum performance for your dryer.
Periodic updates on both the fund rising and the project itself will help create confidence among donors.
Even better, OK Cupid will give you periodic "quivers" of possible matches as they come up.
Unlike silver, platinum does not need periodic recoating or polishing to keep its brilliant appearance.
Silver needs periodic polishing, and white gold has to have new rhodium coatings on occasion.
Kay is confident in its quality and customer satisfaction, and offers a lifetime guarantee on engagement rings if periodic inspections are carried out.
Because this type of spiritual promise is meant to be long term, if not lifelong, the ring should be worn continuously, though it will need to be removed for periodic cleanings and other necessary care.
Sterling silver has an appealing shine that can be maintained with periodic cleanings.
Check the site often as they offer periodic promotions and specials to save you money.
You should also factor in the cost of other accessories, additional electricity to run the bed, and periodic bulb replacement and repair, too.
Many Olive Garden restaurants run periodic advertisements with coupons for $3 to $5 off the price of your meal.
Many Sedu retailers offer periodic deals such as free shipping, mail-in rebates, discounts on larger orders, or free accessories or attachments for popular products.
Many manufacturers will send out periodic e-mail newsletters with printable coupons that you can use to save money on your purchase.
Former members of Weight Watchers online can also expect to receive periodic e-mail offers with savings codes that are good with account reactivation.
As if there weren't enough options online when it comes to Easy Spirit shoes, now you can design your own wish list and address book, be automatically entered in periodic sweepstakes and be alerted to new promotions and sales.
You can also choose to receive periodic emails that include new offerings and special deals.
In its chemical relations, titanium is generally tetravalent, and occurs in the same sub-group of the periodic classification as zirconium, cerium and thorium.
Elements exhibiting strong basigenic or oxygenic characters yield the most stable hydroxides; in other words, stable hydroxides are associated with elements belonging to the extreme groups of the periodic system, and unstable hydroxides with the central members.
A case of special interest and importance is that in which the flow is periodic. The general characteristics of such a flow are illustrated in fig.
But the theory is not strictly applicable, as the phenomena are not accurately periodic, and the state of the soil is continually varying, and differs at different depths, particularly in regard to its degree of wetness.
The first periodic term has a period of twelve, the second of six months, and similarly for the others.
Schuster, who has considered the matter very fully, has found evidence of the existence of other periods-notably 8.4 and 4.8 years-in addition to the recognized period of 11.125 years, and he regards the difference between the maxima in successive II-year periods as due at least partly to an overlapping of maxima from the several periodic terms. This cannot, however, account for all the fluctuations observed in sun-spot frequencies, unless other considerably longer periods exist.
It is more probably abeyance of external function during a periodic internal assimilatory phase.
In Ireland legends of the banshee belong more particularly to certain families in whose records periodic visits from the spirit are chronicled.
Oxygen is a member of the sixth group in the periodic classification, and consequently possesses a maximum valency of six.
The moon's apparent mean motion in longitude seems also to indicate slow periodic changes in the earth's rotation; but these are not confirmed by transits of Mercury, which ought also to indicate them.
But, as has been remarked by Dr Robert Grant (History of Physical Astronomy, p. 515), we are no more warranted in drawing so important a conclusion from casual remarks, however sagacious, than we should be justified in stating that Seneca was in possession of the discoveries of Newton because he predicted that comets would one day be found to revolve in periodic orbits.
Others, however, are periodic, that is to say, the sequence of changes is repeated at regular intervals, and it is thus possible to predict when the maximum and minimum brightness will occur.
Of the periodic variable stars, the lengths of the periods range from 3 hours 12 minutes, which is the shortest yet determined, to 61o days, the longest.
That it must be a periodic stream, because the discharge of the rivers into the Baltic varies with the season of the year.
This has been prompted by periodic complaints made by the general public over the growing number of products of unknown source in the market.
In addition the mechanism of control for periodic orbits is now quite well understood  .
This would, of course, create a periodic error, which would be determinable for the motion of any particular point (say the middle) of the web, but which would be smaller for a point near the axis of the screw and greater for a point farther from that axis.
In the Potsdam form of this apparatus the micrometer is, for convenience, provided with a motion at right angles to the axis of the screw, and it has been found at the Cape Observatory that the periodic errors in this apparatus do vary very sensibly according as the microscope is directed to a point more or less distant from the measuring screw.
This process creates in the space around electric waves or periodic changes in electric and magnetic force round the antenna wire.
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.
Scandium possesses great historical interest, for Cleve showed that it was one of the elements predicted by Mendeleeff about ten years previously from considerations based on his periodic classification of the elements (see Element).
Patients with Bruton's agammaglobulinemia must be given periodic infusions of pooled immunoglobulin from multiple donors.
Common variable immunodeficiency also is treated with periodic infusions of IVIG throughout life.
These often alert you of special promotions or send customers periodic coupons so you can get the best prices on shoes and boots.
Home and Away remains popular and takes periodic breaks for hiatus.
Even if the ink being used is colored, periodic checks must be made under a black light in order to make sure that the ink is being distributed correctly.
This means it takes the steps contained within a business plan and turns them into daily or periodic tasks.
You can take advantage of periodic sales to stock up on basic supplies that are easy to find, so you have more money to spend on hard-to-find items from your favorite specialty stores.
Many craft and fabric stores also offer periodic discounts when you sign up for e-mail offers.
While these diets may be useful, and some evidence even indicates periodic fasting and calorie restriction can halt age-related cognitive decline, the detoxification process can easily take place over a more extended period of time.
Aviva also runs periodic promotions, such as providing home contents insurance for free when you purchase building insurance.
You get paid through periodic checks, similar to how payouts work with whole life insurance.
No matter what the game, designate a rest spot, or give swimmers a periodic break to catch their breath.
Various extended family members and friends also make periodic appearances on the reality show.
During the four years Buffy and Angel were both on the air, the show's shared periodic crossovers involving multiple characters including Buffy, Faith, Spike and Willow.
For many people with mild acne, or those who suffer from periodic breakouts or blemishes, home remedies for acne can be very effective.
Tips are emailed to subscribers on a periodic basis until the filing deadline.
Ever since then, the cap has gone through periodic transitions to make it more effective.
There is no provision for a general periodic assessment, but a state tax commissioner appointed by the governor, treasurer and comptroller assesses the corporations, and the county commissioners (in the counties) and the appeal tax court (in the city of Baltimore) revise valuations of real property every two years.
Ramsay (Was Christ Born at Bethlehem?, 1898, pp. 1 49 ff.) defends the exact accuracy of St Luke's " first census " as witnessing to the (otherwise of course unknown) introduction into Syria of the periodic fourteen years' census which the evidence of papyri has lately established for Egypt, at least from A.D.
Festschrift zum 70ten Geburtstage von Ernst Haeckel, 19(34) has restored the conditions existing in the lagoons and atoll reefs of the Jurassic sea of Solnhofen in Bavaria; he has traced the process of gradual accumulation of the coral mud now constituting the fine lithographic stones in the inter-reef region, and has recognized the periodic laying bare of the mud surfaces thus formed; he has determined the winds which carried the dust particles from the not far distant land and brought the insects from the adjacent Jurassic forests.
Mining taxes, which are subject to periodic changes, consist of an initial or registry tax on the claim (pertenencia), an annual or rental tax on each claim, and a tax of 32% (1905) on the export of unrefined gold and silver, 21% on partially refined ores, and 12% on pure silver.
The fundamental assumption is that the medium contains positively and negatively charged ions or electrons which are acted on by the periodic electric forces which occur in wave propagation on Maxwell's theory.
Periodic Acid, H10 4.2H 2 0, is only known in the hydrated form.
The following is a list (compiled in 1909) of comets which are well established as periodic, through having been observed at List of Periodic Comets observed at more than one Return.
Again, in several cases he ventured to question the correctness of the "accepted atomic weights," on the ground that they did not correspond with the Periodic Law, and here also he was justified by subsequent investigation.
It is a member of the sixth group in the periodic classification of the elements, being included in the natural family of elements containing molybdenum, tungsten and uranium.
Ostwald (ibid., 1900, 35, pp. 33, 204) has observed that on dissolving chromium in dilute acids, the rate of solution as measured by the evolution of gas is not continuous but periodic. It is largely made as ferro-chrome, an alloy containing about 60-70% of chromium, by reducing chromite in the electric furnace or by aluminium.
It is usually of paroxysmal character, and not unfrequently periodic, occurring at a certain time of the day or night.
It is usually of an intensely sharp, cutting or burning character, either constant or with exacerbations, and often periodic, returning at a certain hour each day while the attack continues.
When the attack is periodic the administration of a large dose of quinine two or three hours previous to the usual time of the seizure will often mitigate, and may even prevent the paroxysm.
When the resolution is effected in a perfectly periodic manner, each drop is in the same phase of its vibration as it passes through a given point of space; and thence arises the remarkable appearance of alternate swellings and contractions described by Savart.
Under the action of a vibrator of suitable periodic time the resolution is regularized, and then each drop, breaking away under like conditions, is projected with the same velocity, and therefore follows the same path.
It is manufactured from the magnesium bromide contained in "bittern" (the mother liquor of the salt industry), by two processes, the continuous and the periodic. The continuous process depends upon the decomposition of the bromide by chlorine, which is generated in special stills.
In the span of two complete sunspot periods no evidence was found of periodic or other change with lapse of time.
Some 15,000 observations, from 1851 to 1883, taken by one hundred observers at Greenwich, Washington, Oxford and Neuchatel, cleared as far as possible of personal equation, showed no sign of change that could with probability be called progressive or periodic, particularly there was no sign of adhesion to the sun-spot period.
Johann Kepler had proved by an elaborate series of measurements that each planet revolves in an elliptical orbit round the sun, whose centre occupies one of the foci of the orbit, that the radius vector of each planet drawn from the sun describes equal areas in equal times, and that the squares of the periodic times of the planets are in the same proportion as the cubes of their mean distances from the sun.
The Right who wanted to revive, as they said, the ancient constitution, in other words, to limit the king's power by periodic States-General of the old-fashioned sort, were more numerous and had able chiefs in Cazales and Maury, but strove in vain against the spirit of the time.
The periodic time varying inversely as n, this equation expresses Kepler's third law.
When, following the preceding method, the variations of the elements are expressed in terms of the time, they are found to be of two classes, periodic and secular.
But when this change is more fully investigated, it is found to be really periodic, so that after thousands, tens of thousands, or hundreds of thousands of years, its direction will be reversed and so on continually, like the rising and falling tide.
In this case the variation will be simply periodic, The value of any element of the planet's motion will generally be represented by the sum of an infinite series of such periodic quantities, having different periods.
In this case the motion of U, while still periodic, is seemingly irregular, being much like that of a pitching ship, which has no one unvarying period.
The structure of the molecule, which mainly followed investigations in organic compounds, Frankland's conception of valency, and finally the periodic law, have alsobeen shown in their chronological order.
In English, Roscoe and Schorlemmer's Treatise on Chemistry is a standard work; it records Periodic law.
Magnus; periodic acid, discovered by the latter, is characterized by the striking complexity of its salts as pointed out by Kimmins.
The effect of the rising tide is in the nature of a secular variation, while the pitching is periodic.
This periodic distribution in time and space constitutes an electric wave proceeding outwards in all directions from the sending antenna.
Instead they searched their surroundings wildly in the light of periodic lightning and the fire at the far end of the hall.
This is defined as the speed of revolution of the fictitious body already described, revolving with a uniform angular motion and the same periodic time as the planet.
In spite, however, of all that has been done, the Elbe remains subject to serious inundations at periodic intervals.
In any case, the alterations in level appear to be merely periodic, and due to fluctuations in rainfall, and do not point, as some have supposed, to a secular drying up of the lake.
Chair back cushions are buffeted by every wind that blows, and periodic summer rains run from the top of the cushion down, creating a greater opportunity for taking on moisture through the seams, with the resulting risk of mold and mildew.