When there is appreciable absorption as in the case of the vapours of chlorine, bromine, iodine, sulphur, selenium and arsenic, luminosity begins at a red heat.
This organism is quite distinct from that causing the luminosity of marine fish.
The striking discovery was, in 1903, made by the same investigators that the spontaneous luminosity of radium gives a spectrum of a kind never before obtained without the aid of powerful excitation, electrical or thermal.
Thus we see that the effect of limiting the magnitude to 3.5 is that the hydrogen stars are now practically all within the sphere SP, and it is only the helium stars, whose absolute luminosity is still greater, that are more widely distributed.
It was soon found, however, that compounds possess their own characteristic spectra, and that an element may give under special conditions of luminosity several different spectra.
For The Simpler Gases, Which Are Highly Diathermanous And Radiate Badly Even At High Temperature, The Energy Of Vibration Is Probably Very Small, Except Under The Special Conditions Which Produce Luminosity In Flames And Electric Discharges.
Unfortunately considerations of luminosity compel the observer often to widen the slit much beyond the range within which the theoretical value of resolving power holds in practice.
If we widen the slit still further rapid loss of purity results, with very little gain in light, the maximum luminosity obtainable with an indefinitely wide slit being four times that obtained with the normal one.
A prism or a train of prisms. These are employed in instruments of small power, especially when luminosity is a consideration; but their advantage in this respect is to a great extent lost, when, in order to secure increased resolving power, the size of the prisms, or their number, is unduly increased.
He found that pressure increases luminosity, so that hydrogen, for example, the flame of which in normal circumstances gives no light, burns with a luminous flame under a pressure of ten or twenty atmospheres, and the inference he drew was that the presence of solid particles is not the only factor that determines the light-giving power of a flame.
Dubois (1886), who considers that the luminosity is due to the influence of an enzyme in the cells of the organ upon a special substance in the blood.
Chemical action has frequently been suggested as being a necessary factor in the luminosity of flame, not only in the sense that it causes a sufficient rise of temperature but as furnishing some special and peculiar though undefined stimulus.
Some of the slightly cloudy Ceylon sapphires, usually of greyish-blue colour, display when cut with a convex face a chatoyant luminosity, sometimes forming a luminous star of six rays, whence they are called "star sapphires".
" In the paper quoted the numerical values of p are given for different widths of slit, and a table shows to what extent the loss of purity due to a widening of the slit is accompanied by a gain in luminosity.
The more recent researches of Molisch have shown that the luminosity of ordinary butcher's meat under appropriate conditions is quite a common occurrence.
The hydrocarbons, upon which the luminosity of the flame entirely depends, are divided in the analysis into two groups, saturated and unsaturated, according to their behaviour with a solution of bromine in potassium bromide, which has the power of absorbing those termed "unsaturated," but does not affect in diffused daylight the gaseous members of the "saturated" series of hydrocarbons.
The number of stars is so vast that statistical methods can be applied to many of the characters which they exhibit - their spectra, their apparent and absolute luminosity, and their arrangement in space.
Frederick Slare noticed that the luminosity increased when the air was rarefied, an observation confirmed by Hawksbee and Homberg, and which was possibly the basis of Berzelius's theory that the luminosity depended on the volatility of the element and not on the presence of oxygen.
- The extreme flexibility of the phenomena shown by radiating gases renders it a matter of great importance to examine them under all possible conditions of luminosity.
Hence the apparent reversals so frequently observed in the centre of a widened line may not be reversals at all but due to a reduction in luminosity.
The changes take place continuously, so that there is no period of steady luminosity.
Thus of samples of meat bought in Prague and kept in a cool room for about two days, luminosity was present in 52% of the samples in the case of beef, 50% for veal, and 39% for liver.
The cause of this luminosity is Micrococcus phosphorens, an immotile round, or almost round organism.
Y positions of the heavenly bodies in space, and the changes of those positions with time, constitute the primary subject of investigation by the elder school; while the new astronomy concerns itself chiefly with the individual peculiarities of suns and planets, with their chemistry, physical habitudes and modes of luminosity.
luminosity of the galaxies.
luminosity of the star.
The brightest stars in the cluster have a luminosity equal to 300,000 stars like our own Sun.
Icon list Shows the low-resolution C20 images, all displayed together (in order of increasing radio luminosity ).
What is the relation between stellar luminosity and stellar mass?
The Tully-Fisher relation for the infrared luminosity is: circular velocity = 220 Ã— (L/L *) 0.22.
To maintain hydrostatic equilibrium, the solar envelope also expands and cools, reducing both solar luminosity and effective temperature.
In total DELPHI accumulated data corresponding to an integrated luminosity of approximately 116 pb(-1 ).
This includes the dial which still has very bright luminosity.
Agreement is best for properties of the dark matter and worst for the total X-ray luminosity.
We first estimate the far infrared luminosity density for the luminosity density for the luminosity function derived from IRAS 60 µm data.
luminosity sources must have higher accretion rates and provide a more intense ionizing radiation field.
Thus, a stars X-ray luminosity provides a measure of its activity.
You can also calibrate the galaxy cluster luminosity function.
For example: i) the Extension of the radio luminosity function to very faint sources; do new populations of source exist?
Very sturdy, but easy to operate uni directional ratchet operated rotating bezel and bright luminova luminosity.
Integral 90 m m luminosity function from ELAIS (Sergeant et al.
The surface luminosity of the Lucia Light Box is as low as possible to minimize dazzling.
In the monitor I tested, the red phosphor had the by far lowest initial luminosity.
Brightening Action: Contains natural agents and Polyols to boost microcirculation in the skin and restore radiance and luminosity to the skinÃ¢s surface.
The research showed that reflectance and luminosity of fire escape signage is affected by light refraction in smoke conditions.
What is the relation between stellar luminosity and stellar luminosity and stellar mass?
15, b), emitting the well-known light (see above), is wingless and like a larva; the luminosity seems to be an attraction to the male, whose eyes are often exceptionally well developed.
Some of the slightlycloudy Ceylon sapphires, usually of greyish-blue colour, display when cut with a convex face a chatoyant luminosity, sometimes forming a luminous star of six rays, whence they are called "starsapphires" (see Asteria).
This, however, is manifestly incorrect, as, if it were true, 4% of ethylene mixed with 96% of a combustible diluent such as hydrogen should give 16to 17-candle gas, whereas a mixture of 10% of ethylene and 90% of hydrogen is devoid of luminosity.
Due to the minerals influence, the makeup provides a natural luminosity that is actually good for your skin.
Aided by a dual-layer, auto-exposure sensor, the T2i exposure system (iFCL for intelligent focus, color and luminance) takes factors like subject luminosity, focus distance and perceived color information into account during shooting.
Melding a glass-like luminosity and the earthy texture of slate, the Geologie collection can be configured into a seemingly endless variety of patterns and custom blends.
The light from the candle flame shines through the colored glass and this gives an inner luminosity to the globe.
In their rough form, diamonds lack brilliance, but a master diamond cutter can bring out the luminosity in the rough stone.
This white-colored metal has all the luminosity of gold, but it's far more durable.
Another option is the Avon ANEW Clinical Luminosity Pro Brightening Hand Cream SPF 15.
It may be that these fainter components are still in the stage when the temperature is rising, and the luminosity is as yet comparatively small; but it is not impossible that the massive stars (owing to their greater gravitation) pass through the earlier stages of evolution more rapidly than the smaller stars.
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