| 1 | Ammonia volatilization and availability of Cu,Zn induced by applications of urea with and without coating in soils显示文摘Ammonia volatilization and the distribution of Cu and Zn were investigated in two types of soil treated with coated and uncoated urea.The rate of ammonia volatilization in two weeks after fertilizing with coated urea was 8% in soil 1 (soil derived from river alluvial deposits in Dongting Lake Plain) and 5.15% in soil 2 (red soil derived from quaternary red clay),about half the rates observed when fertilizing with common urea,implying that the hydrolysis speed of the coated urea was lower than for common urea,and that the coated urea can increase nitrogen use efficacy.As for the availability of Cu and Zn,their concentrations decreased in the first week after fertilization,and then increased,which was contrary to the effect of treatment on soil pH.For example,when the pH was 7.99,there was 0.79mg/kg exchangeable Cu and 0.85mg/kg exchangeable Zn in the soil derived from river alluvial deposits in Dongting Lake Plain.However,the concentrations of exchangeable Cu and Zn were generally lower for the common urea treatments than those with the coated urea because the peak pH for the common urea treatment was greater.The concentrations of these elements correlated well with pH in the range 4-8 in second order polynomial fits. | Zhaohui Jiang Qingru Zeng Boqing Tie Bohan Liao Hejie Pi Xiaoyou Feng Yulin Sun | 2012 | Journal of Environmental Sciences2012，24，1： | 0 |
| 2 | Modeling texture development during cold rolling of IF steel by crystal plasticity finite element method显示文摘With the consideration of slip deformation mechanism and various slip systems of body centered cubic (BCC) metals, Taylor-type and finite element polycrystal models were embedded into the commercial finite element code ABAQUS to realize crys-tal plasticity finite element modeling, based on the rate dependent crystal constitutive equations. Initial orientations measured by electron backscatter diffraction (EBSD) were directly input into the crystal plasticity finite element model to simulate the develop-ment of rolling texture of interstitial-free steel (IF steel) at various reductions. The modeled results show a good agreement with the experimental results. With increasing reduction, the predicted and experimental rolling textures tend to sharper, and the results simu-lated by the Taylor-type model are stronger than those simulated by finite element model. Conclusions are obtained that rolling tex-tures calculated with 48 {110}<111>+{112}<111>+{123}<111> slip systems are more approximate to EBSD results. | Hejie Li Jingtao Han Huachun Pi Zhengyi Jiang Dongbin Wei A. Kiet Tieu | 2008 | Journal of University of Science and Technology Beijing2008，15，6： | 0 |
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