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针对钢筋混凝土梁中钢筋理论应力较难准确求解的问题,考虑受拉区混凝土拉应力,按照中性轴随外部作用而变化的思路,探讨了新的求解方法,并在工程实践中检验了该方法的正确性与可行性。 相似文献
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针对应用化学专业培养目标,从实验考核方式、实验教材以及实验教学内容的进行改革与实践,使学生从被动学习变为主动学习,激发学生实验热情,提高学生分析和解决问题能力以及开拓创新能力。 相似文献
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分析了现行油基树脂熬炼装置对环境造成的污染,提出了改进装置的设计方案,可减少环境污染,并能综合利用高温熬炼时产生的废气。 相似文献
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Richard Hartley Jochen Trumpf Yuchao Dai Hongdong Li 《International Journal of Computer Vision》2013,103(3):267-305
This paper is conceived as a tutorial on rotation averaging, summarizing the research that has been carried out in this area; it discusses methods for single-view and multiple-view rotation averaging, as well as providing proofs of convergence and convexity in many cases. However, at the same time it contains many new results, which were developed to fill gaps in knowledge, answering fundamental questions such as radius of convergence of the algorithms, and existence of local minima. These matters, or even proofs of correctness have in many cases not been considered in the Computer Vision literature. We consider three main problems: single rotation averaging, in which a single rotation is computed starting from several measurements; multiple-rotation averaging, in which absolute orientations are computed from several relative orientation measurements; and conjugate rotation averaging, which relates a pair of coordinate frames. This last is related to the hand-eye coordination problem and to multiple-camera calibration. 相似文献
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聚氨酯乳液在纸张涂料中的应用研究 总被引:5,自引:2,他引:3
制备了十一种性能不同的乳化型聚氨酯乳液,分别配制成涂料,涂覆在原纸上,通过相应的涂布纸性能的测试,研究了聚氨酯乳液的羧基含量和交联剂影响。确定纸张涂料用聚氨酯乳液的羧基含量为18%~22%,交联剂以二乙烯三胺为好。 相似文献
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A simulation model based on self-consistent mean field theory (SCMFT) has been developed to inspect the approaching process of the polymer chain grafted AFM tip to a substrate. The effects of various controlling parameters, such as grafting position, chain number, chain length, as well as solvent- and substrate-chain interactions, on the force curve were investigated. Real force spectroscopy of AFM tips modified by poly(ethylene glycol) (PEG) chains interacting with the fresh mica has been recorded, and several typical types of the force curves that correspond to the different states of the grafting chain were assorted. The simulations fit the experimental results well, providing a strong support to the model. 相似文献
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Huimin Qi Hongdong Duan Xingjian Wang Xia Meng Xiaocong Yin Lina Ma 《Polymer Engineering and Science》2015,55(5):1039-1045
In this work, a series of porous terpolymers with degrees of crosslinking at 30–65% were synthesized by suspension polymerization. Fe3O4 nanoparticles were used to modify the porous terpolymer with degree of crosslinking at 30%. The resulting terpolymers with mean pore size of 10–30 nm were used as supports for immobilization of cellulases through covalent bondings. The Fourier transform infrared spectroscopy and thermal gravity analysis measurements demonstrated that cellulases were immobilized onto the porous terpolymers. The effects of pH and temperature on enzyme activity were investigated in acetate buffer medium by hydrolysis of sodium carboxymethyl celluloses. The reusability of immobilized cellulases was also investigated. The result showed that immobilized cellulases exhibited higher residual activities and enzyme activities than free cellulases in wide ranges of pH and temperature. We also found that the reusability of cellulases immobilized on terpolymers with magnetism was better than that of cellulases immobilized on terpolymers without magnetism. POLYM. ENG. SCI., 55:1039–1045, 2015. © 2014 Society of Plastics Engineers 相似文献