A cylindrical or trough-like radiant energy concentration and collection device is provided. The device includes an energy absorber, a glazing enveloping the absorber and a reflective wall. The ideal contour of the reflective wall is determined with reference to a virtual absorber and not the ...
Energy Citations Database
DOEpatents
absorb more light and reflect less light than bright objects. The activity also demonstrates the ... Energy can change forms, in this case from radiant light energy to heat. " Clouds, being bright ... What color are solar cells, for example those found ...
NASA Website
A device is provided for collecting electromagnetic energy developed by an energy source of finite dimension and of finite distance from the collection device. It includes an energy absorber positioned between two side walls which reflects substantially all incident energy received from the ...
An improved solar collector is disclosed which includes a light absorbent component composed of a filamentous structure and a coating of solar radiation absorbent material on the filaments of the filamentous structure.
The fundamental principle of photoluminescent technology is the ability of the photoluminescent material to absorb and store ambient ultraviolet light energy from its surroundings and then emit the stored energy as visible light. Two particular photolumin...
National Technical Information Service (NTIS)
An apparatus is described in which one or more light concentrators comprising thin layers of transparent solid or liquid materials with embedded fluorescent centers are combined with absorbers in order to convert solar light into heat energy at high temperatures.
If biological materials absorb specifically in the near infrared it is likely that they use some of the quantum energy for structural and other changes of the absorbing molecules and, thus, re-emit light of lesser quantum energy. In other words, one may e...
Because of the variable transparency of C sub 3 F sub 7 I, the pump light energy absorbed in the oscillator mode is larger than the pump light energy absorbed in the amplifier mode. The evaluation of the difference, here called ''bleaching losses,'' impor...
A solar energy trap featuring an elongated tubular light pipe for trapping and absorbing electromagnetic radiation waves emitted from the sun and for converting the radiation waves into thermal energy for heating a fluid is described. (WDM)
Fluorescence Resonance Energy Transfer (FRET) Non-radiative transfer of excited state energy of the donor to a second light absorbing molecule (acceptor). Acceptor releases energy through its characteristic fluorescent emission.
Cancer.gov
NDVI is based on the principle that vegetation absorbs red light and reflects near-infrared light. Changes in the amount of each kind of energy reflected ...
theory is simple and easily understood. 3.1 Radiant Energy Light is radiant energy. Electromagnetic is absorbed by the water molecules. The radiant energy of the microwaves is converted into thermal energy its radiant energy is transferred to the ...
E-print Network
All life on earth depends on light. A variety of photoreceptors capture the light for a wide range of reactions. Photosynthetic organisms absorb the light necessary for energy transformation and charge separation facilitating photosynthesis. In addition t...
A mechanism of energy storage previously has been presented which is relevant to three of the most important aspects of modern research on photosynthesis. It was suggested that '(units as small as the photosynthetic unit) absorb not only in the frequency ...
A cylindrical or trough-like radiant energy concentration and collection device is provided. The device includes an energy absorber, a glazing enveloping the absorber and a reflective wall. The ideal contour of the reflective wall is determined with refer...
An electrodeless microwave discharge lamp includes an envelope with a discharge forming fill disposed therein which emits light, the fill being capable of absorbing light at one wavelength and re-emitting the absorbed light at a different wavelength, the light emitted from ...
New light-harvesting thin film supramolecular assemblies, consisting of rod-coil polymer nanocomposites as the light-absorbing energy donors and a randomly dispersed conjugated rigid-rod polymer as the energy acceptor, have been prepared and shown to exhi...
A light weight, low cost, non-corroding, high efficiency solar energy collector is comprised of an absorber plate which is adapted to absorb solar energy in the form of heat and to transfer by conductance the heat to a heat exchange medium. The absorber plate has disposed ...
Melanin is found in the skin, hair and eyes. Melanin is a very complex absorbing material and is produced by melanocytes. It also provides protection against UV and visible light. The compound absorbs light smoothly over a broad spectral range, absorbing the higher energy ...
NSDL National Science Digital Library
in photosynthesis. Historical aspects of some of the basic principles of light absorption and excitation energy functions ofcarotenoids in photosynthesis, namely, light harvesting and photoprotection, with emphasis that light absorbed by fucoxanthin of marine brown algae is fully utilized in ...
Lightweight materials should be lighter in color. Lighter colors absorb less energy (sunlight) and are more reflective. When light energy is absorbed, it is transferred into heat energy. If the material does not have swings by absorbing excess heat in ...
Feb 1, 2011 ... To learn how microbes fulfill these roles on Earth and, ... They are self- sustaining, complete ecosystems in which light energy that is absorbed over ... such as population sizes, elemental cycling and gas production. ...
Healthy vegetation absorbs blue- and red-light energy to fuel photosynthesis and create chlorophyll. A plant with more chlorophyll will reflect more ...
The aquatic photo chemistry of two high-energy compounds was investigated as a part of a larger study of their environmental fate. Ammonium dinitramide (ADN) absorbs light
The aquatic photochemistry of two high-energy compounds was investigated as a part of a larger study of their environmental fate. Ammonium dinitramide (ADN) absorbs light
A reciprocal phase shifter for optically controlling the phase of microwave, millimeter, and submillimeter wavelength electromagnetic energy is described. It includes a source of light and a waveguide which comprises an interaction material for absorbing ...
Aug 31, 2006 ... Fluorescence occurs when plants absorb sunlight and some of that energy is given back off again as red light. ...
Dec 18, 2008 ... The chlorophyll in leaves strongly absorbs the blue and red wavelengths (colors) of sunlight. The energy in the blue and red light permits ...
other forms of chlorophyll, are also present in green plants. These molecules absorb light and then pass the energy to the chlorophyll a. ...
Considers the thermodynamic limitation to the efficiency with which light energy can be converted into work, indicating that no single chemical system converting solar energy into useful work can be very efficient. Also indicates that if solar energy is absorbed as heat for heating purposes, it ...
ERIC Educational Resources Information Center
Cyanine dyes are used as the donor fluorophore in energy transfer labels in which light energy is absorbed by a donor fluorophore and transferred to an acceptor fluorophore which responds to the transfer by emitting fluorescent light for detection. The cyanine dyes impart an unusually high ...
DOE Information Bridge
A solar heat collector is described in which a filamentary heat absorber is disposed within a housing having opaque, heat-insulated sides and bottom and a plurality of partially evacuated tubular members substantially transparent to incident solar radiation mounted on the top thereof. Means are provided for supplying fluid flow to the housing and removing fluid flow from the ...
're cooler than someone wearing dark clothing. Light colors reflect more of the sun's heat, while dark colors absorb it. Similarly, light- colored roofing materials reflect the sun's energy. A light-colored roof acts as an energy multiplier. For example, a typical heat pump ...
of the visible spectrum. The energy of ultraviolet light, just outside the visible range on the high-energy side light has frequencies below 375 THz and IR photons contain less energy than photons of visible light that allow for such absorption-emission sequences with ...
This paper describes the preparation and response to light stimulation of a magnetic semiconductor photosensor (MSP). The MSP is composed of ferrite powder, binder, solvent and a radiant flux absorbent. After the mixed magnetic semiconductor fluid is printed using a spray gun, it is sintered at 800C and its surface is covered with radiant flux ...
, therefore absorbing half the light converted in photosynthesis. It has been known for over ten years, and the light energy it absorbs is converted into electrochemical potential at the PSII reaction centre. Upon~TION How does protein phosphorylation regulate photosynthesis? John F. Alien ...
A method and apparatus for determining the absorption spectra, and other properties, of aerosol particles. A heating beam source provides a beam of electromagnetic energy which is scanned through the region of the spectrum which is of interest. Particles exposed to the heating beam which have absorption bands within the band width of the heating beam ...
Due to the frequency-energy dependence of nonlinear oscillations, nonlinear dynamical absorbers present interesting properties for mitigating unwanted vibrations in mechanical systems. Unlike the tuned mass damper, the functional form of a nonlinear absorber is not known a priori and must be determined. This short note addresses this ...
NASA Astrophysics Data System (ADS)
An immersible solar heater is described comprising a light-absorbing panel attached to a frame for absorbing heat energy from the light and transferring the absorbed heat energy directly to the fluid in which the heater is immersed. The heater can be used to heat a swimming ...
An immersible solar heater comprising a light-absorbing panel attached to a frame for absorbing heat energy from the light and transferring the absorbed heat energy directly to the fluid in which the heater is immersed. The heater can be used to heat a swimming pool, for ...
' reactions, which operate only in the light and use absorbed energy to produce a variety of biochemical not require light but use energy produced by the light reactions to combine CO 2 molecules into sugars, which lev- els were most highly correlated with ...
The image information transfer efficiency for five x-ray fluorescent screens (calcium tungstate, barium halide, and three rare earth screens) has been experimentally determined with monoenergetic x-ray beams at energies of 18, 22, 32, 49, 51, 58, and 69 keV. The transfer efficiency, which is defined by the ratio of the output signal-to-noise ratios, was determined from ...
An apparatus is provided for trapping solar energy emitted from the Sun for heating a fluid that could be subsequently used in turbines and the like. The apparatus includes an elongated vertical light pipe having an open end through which the visible spectrum of electromagnetic radiation from the Sun passes to strike a tubular absorber ...
Ultra-shallow junction formation using an all-solid-state green laser (532 nm) has been investigated. Considering too large penetration depth of the green laser into Si, a light absorber layer was formed on a Si substrate. TiN or Mo was deposited on Si after Sb+ implantation through the 2-nm screen oxide. The TiN light ...
Greenhouse gases in the atmosphere, such as carbon dioxide and water vapor, are transparent to much of the incoming sunlight but not to the infrared light from the warmed surface of the earth. When greenhouse gases increase, more thermal energy is trapped in the atmosphere, and the temperature of the earth increases the light ...
Fire photons to determine the spectrum of a gas. Observe how an absorbed photon changes the orbit of an electron, and how a photon is emitted from an excited electron. Calculate the energies of absorbed and emitted photons based on energy level diagrams. The light energy ...
