摘要:
A protective shield for an ultraviolet-emitting fluorescent lamp comprising a tubular sleeve coaxially surrounding the lamp envelope and formed of a plastic material, such as a fluorocarbon resin of a fluorinated ethylene-propylene, which has a spectral transmittance of at least about 80 percent of the ultraviolet radiation emitted from the lamp over the wavelength range from about 320 to 400 nanometers and substantially maintains such transmittance, along with mechanical integrity, after at least about 1000 hours of lamp operation.
摘要:
A phosphor blend for a compact fluorescent lamp is described wherein the phosphor blend comprises a green-emitting Tb3+ phosphor, a Y2O3:Eu3+ phosphor, a Sr6BP5O20:Eu2+ phosphor, a Mg4GeO5.5F:Mn4+ phosphor, and optionally a BaMgAl11O17:Eu2+ phosphor, wherein the blend contains from 1% to 20% by weight of the Sr6BP5O20:Eu2+hosphor and from 5% to 30% by weight of the Mg4GeO5.5F:Mn4+phosphor. A compact fluorescent lamp having a phosphor coating containing the phosphor blend produces a light that is perceived as more pleasing than the light produced by standard compact fluorescent lamps.
摘要翻译:描述了一种用于紧凑型荧光灯的荧光粉混合物,其中所述荧光体共混物包括发绿光的Tb 3+荧光体,Y 2 O 3:Eu 3+荧光体,Sr 6 BP 5 O 20:Eu 2+荧光体,Mg 4 Ge 5 O 5 5.F:Mn 4+荧光体和任选的BaMgAl 11 O 17:Eu 2+荧光体, 其中所述共混物含有1重量%至20重量%的Sr 6 BP 5 O 20:Eu 2+氧化物和5重量%至30重量%的Mg 4 Ge 5 O 5 5.F:Mn 4+磷光体。 具有包含荧光体共混物的荧光体涂层的紧凑型荧光灯产生被认为比由标准紧凑型荧光灯产生的光更令人愉快的光。
摘要:
A lamp assembly includes a reflector having a concave reflecting surface and an axis of rotation, and a light source including a filament mounted at or near a focal point of the reflecting surface. The filament has a length to diameter ratio of 6:1 or greater. The reflecting surface is formed as a multiplicity of reflecting facets. The facets on at least 50% of the reflecting surface have dimensions and curvatures selected to produce a light pattern wherein a ratio of filament width spread to filament length spread produced by the facets is at least 2:1. Preferably, the facets are arranged in axially adjacent rings. The facet rings can be successively offset in a rotational direction so as to reduce circumferential variations in the light pattern.
摘要:
A miniature, low-wattage fluorescent lamp includes a double-bore inner capillary tube having a pair of ends and a convoluted shape. The inner capillary tube is comprised of a vitreous material (e.g., quartz) which is capable of transmitting ultraviolet radiation. A pair of electrodes (e.g., mercury pool) is located at one end of the inner capillary tube and disposed within respective bores. An ionizable medium is enclosed within the inner capillary tube and includes an inert starting gas and a quantity of mercury. When energized, the ionizable medium generates an arc discharge between the electrodes consisting of ultraviolet radiation. A phosphor coating responsive to the ultraviolet radiation is disposed on an outer surface of the inner capillary tube and remote from the arc discharge. An outer jacket of vitreous material surrounds the inner capillary tube and contains an inert gas at a predetermined pressure.
摘要:
An incandescent projection lamp which includes a reflector located within the lamp's envelope at an established distance from a biplanar filament structure. The lamp provides bidirectional light output with the reflector having an opening therein for defining the light output in one of the directions.
摘要:
A phosphor blend for an LED light source is provided wherein the phosphor blend comprises from about 7 to about 12 weight percent of a cerium-activated yttrium aluminum garnet phosphor, from about 3 to about 6 weight percent of a europium-activated strontium calcium silicon nitride phosphor, from about 15 to about 20 weight percent of a europium-activated calcium silicon nitride phosphor, and from about 55 to about 80 weight percent of a europium-activated calcium magnesium chlorosilicate phosphor. An LED light source in accordance with this invention has a B:G:R ratio for a 3200 K tungsten balanced color film of X:Y:Z when directly exposed through a nominal photographic lens, wherein X, Y and Z each have a value from 0.90 to 1.10.
摘要:
The present invention provides formulations and methods for isolating food-borne pathogens from a great variety of food matrices. Methods for isolating microorganisms from clinical and environmental specimens are also disclosed. The invention also concerns methods for rapid and efficient isolation of sufficiently pure DNA from small amounts of various pathogenic microorganisms, which then can be used, according to the methods of the instant invention, for selective identification of a live pathogenic microorganism present in a sample from which the microorganism was isolated. The methods of the instant invention are also useful for identification of new pathogenic microorganisms, diagnostics of food-borne illnesses, treatment of food-borne diseases and quality control of food items offered for sale to consumers.