Optical Studies of porous Silicon
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Porous Silicon
Anodizing
Absorbance
Stain
Dye-binding methods based on protein error for determining human serum albumin are classified into two methodologies via measurements of the absorbance increase under an acidic condition (absorbance increase method) and the absorbance decrease in a pH region near the neutral condition (absorbance decrease method). The color development of protein in the absorbance increase method is known to be affected by the pH, and the concentrations of dye, buffer and coexisting anions in the samples. However, the effect of coexisting anions on color development in the absorbance decrease method is unclear. In the present work, the effect of an inorganic salt on color development in the absorbance decrease method was investigated by a calculation based on the chemical equilibrium of the protein error and an experiment, and was compared with the results of the absorbance increase method. By adding an inorganic salt, the absorbance was decreased. The degree of its decrease was smaller in the absorbance decrease method than in the absorbance increase method, and differed according to the kind of inorganic salt. The experimental results agreed well with those obtained by a calculation.
Absorbance
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Porous Silicon
Light emission
Polycrystalline silicon
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Porous Silicon
Intensity
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The possibility of the electroluminophore semiconductors of the II-VI group to the construction of the electric field intensity sensors are presented. Using ZnS:Mn and ZnS:Cu luminophors, the fiber optic intensity of electric field sensors were elaborated. This kind of electric field sensors belong to the group of intensity fiber optic sensors. Electroluminescent phenomena of two groups pf electroluminescent effects are classified as: 1) internal electroluminescence and 2) carrier-injection electroluminescence. In the paper there are described sensors based on carrier-electric injection electroluminescence.
Intensity
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We report the optical and electrical properties of deuterium terminated porous Si. It is found that the replacement of hydrogen with deuterium reduces the degradation not only of photoluminescence but also of electroluminescence. The luminescence degradation was analyzed using a rate equation model for photoinduced oxidation.
Porous Silicon
Degradation
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The objective of this research was to experimentally determine whether signs of water deficit stress in plants can be detected from changes in the absorbance spectra based on the relationships between absorbance spectra and physiological parameters. Absorbance of tomato leaves in the near-infrared (NIR) wavelengths (1100 nm to 2500 nm) was measured simultaneously with photosynthesis and stomatal conductance during water stress. To observe small changes in absorbance which arise from water stress, a leaf in non-stressed conditions was used as a reference for the absorbance measurements. In general, under the effects of water stress, peaks formed in the absorbance spectra at water absorbance bands near 1 440 nm and 1 940 nm, and absorbance decreased near 1 600 nm forming a valley. Although the relationship between the changes in absorbance and physiological parameters varied depending on the individual plants tested, consistent overall trends were observed, demonstrating there is potential to nondestructively detect changes in plant condition resulting from water stress by measuring NIR absorbance.
Absorbance
Water Stress
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The composition and structure of porous alumina films formed in H 2SO 4 solution by AC and DC anodizing have been investigated separately.The two kinds of porous films are all composed of (Al 2O 3) 4·H 2O,Al(OH) 3 and Al 2(SO 4) 3,but sulphur and sulphide are also found in AC anodizing films.The pore shape of DC anodizing films are more regular than that of AC anodizing films.The surface morphology of AC anodizing films is much coarsened.
Anodizing
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Electroluminescence from SiO2 has been studied both experimentally and theoretically. Numerical simulations have been carried out to investigate electroluminescence and impact ionization processes. A firm connection between electroluminescence and impact ionization has been shown.
Impact ionization
Silicon dioxide
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Eelectroluminescence is a solid light. Based on the different structure and working principle, Electroluminescence (EL) can be divided into inorganic electroluminescence and organic electroluminescence. In this paper some rresearches on electroluminescence are reviewed. The principle, structure and application of inorganic electroluminescence and organic electroluminescence are illustrated. Some recent focuses are discussed. EL has wide future. They are better than other display technologies for the flat panel display applications.
Electroluminescent display
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