Rheological behavior of this article presents rapeseed oil. Dynamic viscosity of rapeseed oil was determined at temperatures between 40 ℃-90 ℃ and shear rates ranging from 3.3-120 s1. All types of oils studied Bingh...Rheological behavior of this article presents rapeseed oil. Dynamic viscosity of rapeseed oil was determined at temperatures between 40 ℃-90 ℃ and shear rates ranging from 3.3-120 s1. All types of oils studied Bingham fluid behavior in the temperature range from 313-363 K. Correlation coefficients have similar values to one for all oils studied.展开更多
Se （selenium） is an essential trace element for both animals and human beings, although it is considered to be conditionally required for plants. Se occurrence in the environment of Moldova is poorly understood. The...Se （selenium） is an essential trace element for both animals and human beings, although it is considered to be conditionally required for plants. Se occurrence in the environment of Moldova is poorly understood. The objective of this study was to establish Se content and distribution in soils of this country. Se content in samples was detected using fluorometric method. Se concentration in soils ranged from 100 μg·kg^-1 to 668 og-kg-1 dry weight （mean 246 ± 73 μg·kg^-1）. Mainly, Se content in soils was optimal （more than 175 μg·kg^-1）, however, there were soil areas with Se deficiency （lower than 125/μg·kg^-1）. Maximum of Se in soils was observed at the depth of 0.4-0.7 m and then it decreased on going to parent rock. Se content typically increased with increasing of soil clay particles. Se washout from terraces and watershed slopes as well as Se accumulation in relief depressions was shown. High Se concentrations in local surface waters （0.2-6.1 μg·L^-1, mean 1.8 μg·L^-1） indicated the substantial presence of soluble Se forms, which were available to plants. Thus, geochemical conditions of Moldova are favorable for Se bioaccumulation by plants.展开更多
Static dielectric constant is a key parameter to estimate the electro-viscous effect which plays important roles in the flow and convective heat transfer of fluids with ions in microfluidic devices such as micro react...Static dielectric constant is a key parameter to estimate the electro-viscous effect which plays important roles in the flow and convective heat transfer of fluids with ions in microfluidic devices such as micro reactors and heat exchangers.A group contribution method based on 27 groups is developed for the correlation of static dielectric constant of ionic liquids in this paper.The ionic liquids considered include imidazolium,pyridinium,pyrrolidinium,alkylammonium,alkylsulfonium,morpholinium and piperidinium cations and various anions.The data collected cover the temperature ranges of 278.15-343.15 K and static dielectric constant ranges of 9.4-85.6.The results of the method show a satisfactory agreement with the literature data with an average absolute relative deviation of 7.41%,which is generally of the same order of the experimental data accuracy.The method proposed in this paper provides a simple but reliable approach for the prediction of static dielectric constant of ionic liquids at different temperatures.展开更多
文摘Rheological behavior of this article presents rapeseed oil. Dynamic viscosity of rapeseed oil was determined at temperatures between 40 ℃-90 ℃ and shear rates ranging from 3.3-120 s1. All types of oils studied Bingham fluid behavior in the temperature range from 313-363 K. Correlation coefficients have similar values to one for all oils studied.
文摘Se （selenium） is an essential trace element for both animals and human beings, although it is considered to be conditionally required for plants. Se occurrence in the environment of Moldova is poorly understood. The objective of this study was to establish Se content and distribution in soils of this country. Se content in samples was detected using fluorometric method. Se concentration in soils ranged from 100 μg·kg^-1 to 668 og-kg-1 dry weight （mean 246 ± 73 μg·kg^-1）. Mainly, Se content in soils was optimal （more than 175 μg·kg^-1）, however, there were soil areas with Se deficiency （lower than 125/μg·kg^-1）. Maximum of Se in soils was observed at the depth of 0.4-0.7 m and then it decreased on going to parent rock. Se content typically increased with increasing of soil clay particles. Se washout from terraces and watershed slopes as well as Se accumulation in relief depressions was shown. High Se concentrations in local surface waters （0.2-6.1 μg·L^-1, mean 1.8 μg·L^-1） indicated the substantial presence of soluble Se forms, which were available to plants. Thus, geochemical conditions of Moldova are favorable for Se bioaccumulation by plants.
基金Supported by the National Natural Science Foundation of China(21176206)the Project of Zhejiang Key Scientific and Technological Innovation Team(2010R50017)
文摘Static dielectric constant is a key parameter to estimate the electro-viscous effect which plays important roles in the flow and convective heat transfer of fluids with ions in microfluidic devices such as micro reactors and heat exchangers.A group contribution method based on 27 groups is developed for the correlation of static dielectric constant of ionic liquids in this paper.The ionic liquids considered include imidazolium,pyridinium,pyrrolidinium,alkylammonium,alkylsulfonium,morpholinium and piperidinium cations and various anions.The data collected cover the temperature ranges of 278.15-343.15 K and static dielectric constant ranges of 9.4-85.6.The results of the method show a satisfactory agreement with the literature data with an average absolute relative deviation of 7.41%,which is generally of the same order of the experimental data accuracy.The method proposed in this paper provides a simple but reliable approach for the prediction of static dielectric constant of ionic liquids at different temperatures.
