Development of subsurface chlorophyll maximum layer and its contribution to the primary productivity of water column in a large subtropical reservoir.

The phenomenon of subsurface chlorophyll maximum (SCM) layer emerging at a certain water depth is commonly found in stratified water bodies. Also, it is a crucial contributing region to the primary productivity of the water column. Currently, there is a lack of concern about the occurrence of SCM phenomena in studies targeting inland water bodies such as natural lakes and artificial reservoirs.

[Determination of Fe and Ba in BaFe12O19 samples by binary ratio and X-ray fluorescence spectrometry].

A new quantitative analysis method was established for the determination of Fe and Ba in BaFe12O9 samples by binary ratio and X-ray fluorescence spectrometry. The calibration curve was established by a self-made pure Fe powder(AR) and pure BaCO3 powder(AR) standard sample which was prepared by powder pellet method. The standard sample has the content of Fe 75% and the content of Ba is 17.

Optimized thermal design of new reflex LED headlamp.

This paper focuses on the heat dissipation efficiency issues in LED headlamps. The cooling structure is designed and built in Ansys-icepak software based on computational fluid dynamics. During optimized simulation of a single model, geometric parameters, maximum temperature, and thermal resistance are taken as variables, constraint, and objective, respectively.