scholarly journals Use of the 0.22 μm Millipore membrane for light-transmission measurements of aquatic particles

1996 ◽  
Vol 18 (7) ◽  
pp. 1261-1267 ◽  
Author(s):  
G.M. Ferrari ◽  
S. Tassan
Keyword(s):  
Light Transmission ◽  
Transmission Measurements ◽  
Millipore Membrane

scholarly journals Light transmission measurements and phototherapy eyepatches.

1991 ◽  
Vol 66 (1 Spec No) ◽  
pp. 59-61 ◽  
Author(s):  
J Robinson ◽  
M J Moseley ◽  
A R Fielder ◽  
S C Bayliss
Keyword(s):  
Light Transmission ◽  
Transmission Measurements

Comparison of Two Coating Material Reflections of Hollow Light Guide Tube

2014 ◽  
Vol 1041 ◽  
pp. 412-415
Author(s):  
Lenka Janečková ◽  
Stanislav Darula ◽  
Daniela Bošová
Keyword(s):  
Light Guide ◽  
Light Transmission ◽  
Transmission Efficiency ◽  
Luminous Flux ◽  
Coating Material ◽  
Guide Tube ◽  
Coating Materials ◽  
Two Samples ◽  
Transmission Measurements ◽  
Light Guides

This paper discusses tube transmission efficiency of two straight hollow light guides. Two samples with diameter of 530 mm and length 1170 mm were investigated under the artificial sky in the laboratory at ICA SAS in Bratislava. The entering luminous flux was calculated from measured illuminance in the point located on the top of light guide. Below the bottom of the light guide was located a set of measuring points on the special construction in the shape of a cross. In these points, one by one, the elementary illuminances were measured and the luminous fluxes leaving the light guide were calculated. Paper presents methodology for laboratory light transmission measurements and discusses effects of two various coating materials on light transmission efficiency of hollow light guides.

scholarly journals Measurements of Photo-Induced Changes in Conjugated Polymers

1991 ◽  
Vol 228 ◽  
Author(s):  
Carleton H. Seager ◽  
Michael B. Sinclair ◽  
D. Mc Branch ◽  
A. J. Heeger ◽  
G. L. Baker
Keyword(s):  
Absorption Spectra ◽  
Light Transmission ◽  
Pump Light ◽  
General Shape ◽  
Experimental Conditions ◽  
Photothermal Deflection Spectroscopy ◽  
Highly Sensitive ◽  
Infra Red ◽  
Transmission Measurements ◽  
Induced Changes

ABSTRACTWe have used the highly sensitive technique of Photothermal Deflection Spectroscopy (PDS) to measure changes in the infra-red absorption spectra of MEHPPV, P3HT and Polydiacetylene-4BCMU induced by pumping these polymers with light above the π - π* transition energy. In contrast to previous chopped light transmission measurements of these effects, the PDS technique can directly measure the buildup or decay of the absorption coefficient, m, on the time scale of seconds to days. In the case of MEHPPV we observe that above-gap light causes the appearance of a broad infra-red peak in α, which continues to grow-in hours after the pump light is first applied. For this polymer the general shape of the absorption spectra in the unpumped state mimics the photo-induced changes, suggesting that remnant photo-induced states determine the maximum transparency observed under normal experimental conditions. For P3HT and to a lesser extent, MEHPPV, we also observe irreversible photo-induced absorption components which we tentatively identify with photo-induced oxidation of the polymer matrix.

Use of Thin-Layer Chromatography on Silica Gel for Serum Lipid Fractionation and Measurement in the Routine Clinical Laboratory

1972 ◽  
Vol 18 (4) ◽  
pp. 384-390 ◽  
Author(s):  
Antonio Chedid ◽  
Peter Haux ◽  
Samuel Natelson
Keyword(s):  
Thin Layer ◽  
Silica Gel ◽  
Light Transmission ◽  
Clinical Laboratory ◽  
Internal Standard ◽  
Serum Fractions ◽  
Transmission Measurements ◽  
Routine Clinical Laboratory ◽  
Layer Chromatography ◽  
Apparently Healthy

Abstract A procedure, appropriate to use in the routine laboratory, is described for thin-layer chromatographic separation of serum lipids on silica gel, followed by molybdate coloring and densitometry. Cholesteryl aniline is used as the internal standard. The procedure is recommended as a screening procedure for presenting graphically the lipid distribution in the serum. Fractions separated and values (±1 SD) obtained from light-transmission measurements, for 70 apparently healthy adults, were: phospholipids, 239 ± 69 mg/dl; monoglycerides, <5 mg/dl; cholesterol, 53 ± 12.2 mg/dl; diglycerides, <5 mg/ dl; free fatty acids, 14.3 ± 8.9 mg/dl; triglycerides, 89 ± 30 mg/dl; and esterified cholesterol, 164 ± 25 mg/dl. The method was applied to the study of distribution of lipids in the serum of patients with various diseases.

Comparative Analysis of Two Indirect Methods of Measuring Leaf Area Index as Applied to Minimal and Spur Pruned Grape Vines

1994 ◽  
Vol 21 (2) ◽  
pp. 197 ◽  
Author(s):  
KJ Sommer ◽  
ARG Lang
Keyword(s):  
Comparative Analysis ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Light Transmission ◽  
Accurate Estimate ◽  
Indirect Methods ◽  
Area Index ◽  
Leaf Sampling ◽  
Transmission Measurements

Leaf area index of spur and minimal pruned vines was measured directly by destructive leaf sampling and indirectly from light transmission measurements using the LAI-2000 and the DEMON instruments. Both instruments provided good estimates of plant and leaf area index. The LAI-2000 had a tendency to underestimate leaf area index. The DEMON instrument provided the most accurate estimate of plant and leaf area index. With both instruments it is important to validate indirect with direct estimates of vine leaf area.

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