Huijuan Tian | PubMed Health

PubMed2006

Influence of the third-order parameter on diffuse reflectance at small source-detector separations.

Spatially resolved reflectance close to source has received a great deal of attention recently. This research is considered to develop a new noninvasive technique for measuring the optical properties of biological media. Using Monte Carlo simulations, we investigated the influence of third-order parameter 5 on diffuse reflectance and found that the reflectance decreased with an increase of delta at a short source-detector separation of approximately 0.7-2 transport mean free paths. We show that the effects of two parameters, y and second-order parameter delta, on the reflectance are contrary. As a result the influence of the second-order parameter y on the reflectance is irregular when the condition delta delta<<delta gamma is not satisfied.

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PubMed2006

[Distribution characteristics of organic matter and total nitrogen in sediments of lake Wuliangsuhai].

Lake Wuliangsuhai is one of the representative inland freshwater lakes in grassland areas of China, and its shrinking and eutrophication is becoming more serious. The study on the ecological and environmental effects of the shrinking and eutrophication revealed that the total nitrogen (TN) content in the surface sediment of the lake had an obvious differentiation both in longitudinal and in latitudinal direction, and had a significant correlation with organic matter content. The mean C/N ratio of the sediment ranged from 12.07 to 19.95, which meant that the organic matter was mainly come from the hydrophytes of the lake, and the eutrophication of the lake was mostly caused by its internal load. Both TN and organic matter had a clear grain-size effect in different fractions of grain sizes of surface sediment, and their contents in IV (< 63 microm) were as 3.1 - 7.6 and 2.5 - 8.0 times as those in I (>250 microm), respectively.

Carbon↗