Brightness meter

Brightness Meter. A special type of reflection meter for evaluating the brightness of paper and similar products by measuring the diffuse... 

Brightness. The brightness of mica is deterrnined with a Photovoltmeter (Photovolt Co.) or other suitable reflectance meter using a green 550-p.m filter. The mica sample is prepared by pressing it into a smooth layer on a smooth glass surface. 

Now carefully add sodium hydroxide solution (1M) until the pH of the solution has risen to 12 (pH meter) 3-6 mL of the sodium hydroxide solution will be required. Continue the titration of the bright blue solution with the... 

In addition to the LGS brightness, a tilt isoplanatic angle

flux limitation only the fraction (p/e of the plume can be used to sense one component of the tilt. Lrom preliminary studies, the telescope diameter of the auxiliary telescopes should range around 25cm. This concept should provide us with a sky coverage > 50%, provided that the auxiliary telescopes can move across several hundred meters baselines. 

Particles and gases in the earth s atmosphere absorb about 25% of this energy and 25% is reflected back to space by the atmosphere, mostly from clouds. About 5% of the incoming solar radiation is reflected back to space from the surface of the earth, mostly from bright regions such as deserts and ice fields. A 1-square-meter surface (39 inches by 39 inches), placed above the atmosphere will collect about 1,370 watts of radiant... 

The attractiveness of the bright arsenic colors and the development of cheap arsenic pigments and printing methods led to the widespread use of wallpaper in British and other European homes in the nineteenth century. A square meter of wallpaper would often contain 25-35 g of arsenic and by 1858 some 260 million km2 of arsenic-bearing wallpaper hung in British homes (Meharg, 2005), 67-68. Wallpaper use... 

Napoleon s armies spread the system throughout continental Europe, but the British (and consequently the Americans) hung to the old English inch-pound-second system. From cgs the kilogram-meter-second (mks) system evolved, and finally SI (Systeme International d Unites) was bom from mks with the addition of units of current (ampere), temperature (kelvin), and brightness (candela). The International Temperature Scale is defined by 13.8033 K (triple point of equilibrium H2) 24.5561 K (triple point of Ne) and 1234.93 K (freezing temperature of Ag). 

Curves were plotted from MD/CD averages. TAPPI brightness was read with the Photovolt Meter 670. Sheets were aged in Blue M circulating air ovens at 100°C. 

Technical Observations. Acid orange A is one of the most widely used monoazo dyes because of its low cost and bright color. In large scale preparations, the coupling reaction is done in huge pitchpine vats having a capacity of 15,000 liters or more, or in concrete vats measuring up to 40 meters across and lined with refractory tile. 

Determination of Physical Properties of Paper. BRIGHTNESS. The brightness was measured with a Photovolt model 670 reflectance meter. Measurements were made at 10 different places on both sides of the sheet, and the readings were averaged. 

When one isotope of krypton, krypton-86, is heated, it gives off a very clear, distinct, bright line with a reddish-orange color. Scientists decided to define the meter in terms of that line. They said that a meter is 1,650,763.73 times the width of that line. 

Figure 6. Grayscale wavelength-dispersive electron microprobe map of arsenic distribution in a segment of a pyritized fossil fragment, LP-l core, 81.2 meters. Arsenic-rich pyrite occurs as overgrowths (bright bands) onframboids (darker spheres). Arsenic contents of the points shown are as follows I 6.6 wt. % 2 7.2 wt. % 3 6.9 wt.% 4 6.7 wt. % 5 6.8 wt. % 6 8.5 wt. % 7 2.0 wt. % 8 1.0 wt. %. Area shown is approximately 400 x 450 0.50 pm pixels.

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