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Showing 1 to 20 of 151 for “"Spectrophotometer"”.
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Design and construction of a new spectrophotometer
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1930.
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The design and construction of a photoelectric spectrophotometer for analytical research
<p>A spectrophotometer has been built, consisting of three parts, a monochromator, a photocell amplifier, and a recorder;The monochromator used a new optical system, a modification of the Wadsworth mounting for concave reflection diffraction gratings;Upon calibration of the monochromator using a …
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Some improvements in the automatic recording spectrophotometer of the color measurements laboratory
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1951.
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Wavelength Modulation and Noise Reduction Using a Minicomputer-Controlledultraviolet - Visible - Near-Infrared Recording Spectrophotometer
Made available in DSpace on 2014-12-10T23:01:59Z (GMT). No. of bitstreams: 1 7500450.pdf: 6453592 bytes, checksum: 3613485c98194a2b43d409e8801a2e4e (MD5) Previous issue date: 1974
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A Stopped-Flow Analyzer for Kinetic Methods Development - Automated Implementation of Guggenheim's Methods
… directly transform a conventional single-beam spectrophotometer into a versatile stopped-flow kinetic analyzer. A relatively inexpensive microcomputer system serves as a dedicated controller/data processor for the instrument. The design employed features preservation of the optical …
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The in vitro effect of a tooth bleaching agent on coffee and wine stained teeth
… the degree of color change with the use of a spectrophotometer and not by the usual subjective, visual methods. Methodology: Twenty specimens of human teeth will be collected, polished and divided into two groups. A baseline color measurement by the CIE L* a* b* with a spectrophotometer …
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A combined microfluidic/dielectrophoretic microorganism concentrator
… and their concentrations measured using a spectrophotometer. Concentration enhancements up to 40x at 500 gl/min flowrate using polystyrene microspheres and up to 10x at 100 gll/min flowrate using B. subtilis spores are achieved.
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Fabrication and optimization of N-Cu2O thin film using electrodeposition method for homojunction solar cell
… parameter varied. Ultra violet-visible (UV-Vis) spectrophotometer was used to study the optical absorption of Cu2O and to determine the band gap of the deposited thin film with further calculation including the thickness values of the thin film measured by surface profiler. The resistivity and …
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Development of a flameless atomic absorption assay for mercury in biological materials and levels of mercury detected in striped bass (Roccus saxatilis) collected in the San Joaquin Delta
… directly connected with an atomic absorption spectrophotometer Seven tissues from ten samples of locally obtained Roccus saxatilis (striped bass) were analyzed, and a three-fold elevation of mercury levels in the liver over the levels in the filet noted. See Table XIX for a comparison of the …
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Use of fluorescent micropsheres to measure coronary flow reserve in rat animal model
… were chosen (yellow-green; red). Using a spectrophotometer, fluorescence intensity was calibrated for known numbers of microspheres (set via controlled dilution). CBF in two rats was measured at rest and during maximal vasodilation (adenosine) using procedures for colored microspheres. …
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Dimethyl N-Aryl phosphoramidates : structural effects on bonding and solvolytic reactivity
… the rates of hyd~olysis with the aid of a UV spectrophotometer. These rates have been correlated with the pKa values of the corresponding ani I inium iOhs and the slope of this reactivitybasicity relationship for phosphoramidate with ortho substituents (6 = 0~85) is found to differ from that …
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Determination of Atrazine Concentration in Freshwaters Using Fluorescence Spectroscopy
… of atrazine will be analyzed using fluorescence spectrophotometer to develop a calibration curve. </p> <p>The calibration concentration curve developed would be used in the future as an analytical technique to determine the concentrations of atrazine in real local water samples collected by the …
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Mineral content of vegetables grown with organic and mineral fertilizers
… using the Perkin-Elmer Atomic Absorption Spectrophotometer. Unequal variation between treatments rendered the F test meaningless for many minerals. Where differences were found, they were in favor of chemically fertilized vegetables as often as in favor of those fertilized organically. It …
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ΜΕΛΕΤΗ ΚΑΤΑΝΟΜΗΣ ΚΑΙ ΕΠΑΝΑΔΙΑΛΥΣΗΣ ΒΑΡΕΩΝ ΜΕΤΑΛΛΩΝ ΣΕ ΝΕΡΑ ΚΑΙ ΙΖΗΜΑΤΑ ΠΟΤΑΜΩΝ ΤΗΣ ΒΟΡΕΙΑΣ ΕΛΛΑΔΑΣ
… METALS WERE ANALYSED USING ATOMIC ABSORPTION SPECTROPHOTOMETER WITHFLAME OR ELECTROTHERMAL ATOMIZATION.
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CHARACTERIZATION OF LONG PATHLENGTH CAPILLARY WAVEGUIDES FOR EVANESCENT FLUORESCENCE APPLICATIONS
… the FOCap to a light source and a fluorescence spectrophotometer. The FOCap has negligible excitation light loss over long lengths (20 m or more) for a range of wavelengths. The evanescent fluorescence was linear up to at least 20 m for a solution in the core and up to at least 15 m for a …
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CHARACTERIZATION OF LONG PATHLENGTH CAPILLARY WAVEGUIDES FOR EVANESCENT FLUORESCENCE APPLICATIONS
… the FOCap to a light source and a fluorescence spectrophotometer. The FOCap has negligible excitation light loss over long lengths (20 m or more) for a range of wavelengths. The evanescent fluorescence was linear up to at least 20 m for a solution in the core and up to at least 15 m for a …
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Determination of Selected Heavy Metals in Some Creeks in a Tennessee City.
… a city in Tennessee using Atomic Absorption Spectrophotometer. Mean concentrations of Ni, Cu, Zn, Cd, Pb, and Fe in the sites examined reveal that they exceed the USEPA recommended limits. High concentrations of Cu (0.130 mg/L), Zn (13.7 mg/L), Ni (0.267 mg/L), and Cd (0.010 mg/L) were …
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A study of statistical and deterministic models for the prediction of the composition of a mixture
… from the determination of density and the spectrophotometer analysis of 2NDPA. Since the latter analysis is a quick and accurate determination of the 2NDPA content and since the content of the third component could be determined by complementing to 100 percent, the models have been …
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Biophysical Studies Aimed at Potential Therapies of Hemoglobin Associated Diseases
… A Hemox Analyzer, a dual-wavelength spectrophotometer, was used to measure oxygen affinity in sRBC treated with a potential drug intended to improve oxygen affinity. Deformability, the ability of the cells to elongate when exposed to shear, was measured as a function of osmotic …
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