排序方式: 共有22条查询结果,搜索用时 968 毫秒
1.
Cheng Fei Xu Yunfei Lv Zhenfei Huang Zhaohui Fang Minghao Liu Yan’gai Wu Xiaowen Min Xin 《Journal of Thermal Analysis and Calorimetry》2021,146(5):2089-2099
Journal of Thermal Analysis and Calorimetry - In this study, we focus on important global issue containing both environmental pollution control and energy saving. High density polyethylene (HDPE)... 相似文献
3.
Meishan Pei Cheng Li Zhenfei Wang Jin Zhang Xiaojuan Qin Lijuan Liu 《Journal of Dispersion Science and Technology》2013,34(4):530-534
p‐Aminobenzoic acid and calcium lignosulfonate (CL) are used as main raw materials in the synthesis of carboxyl calcium lignosulfonate (CCL). The surface activity of CCL is measured, and the properties of cement particles with CCL are investigated such as adsorption quantity and Zeta potential. Test results show that CCL has higher surface tension, lower adsorption quantity on cement than CL, the Zeta potential of cement particles with CCL is similar to that of cement particles with CL, the dispersing ability of CCL is stronger than that of CL, the viscosity loss of cement paste with CCL is less than that with CL, and the compressive and flexural strength of mortars with CCL are higher than that with CL. 相似文献
4.
介绍了毫克至克量级弹丸7 km/s以上超高速发射技术的国内外研究进展,并对各发射装置的工作原理和技术要素进行了简要阐述.基于电磁驱动准等熵加载,美国ZR装置驱动25 mm×13mm×1.0mm铝飞片至46km/s速度,国内CQ系列磁驱动加载装置实现了 10mmx6mmx0.33mm铝飞片18 km/s的发射.借助于金属箔电爆炸产生高压气体驱动,美国利弗莫尔实验室100kV电炮装置驱动9.5mm×9.5 mm×0.3 mm的Kapton膜至18 km/s,国内流体物理研究所98 kJ和200 kJ电炮装置分别驱动?10 mmx0.2 mm Mylar飞片和?21 mm×0.5 mm Mylar飞片到10 km/s.基于阻抗梯度飞片技术,采用汇聚型和非汇聚型结构三级轻气炮,实现了厘米量级铝飞片和TC4钛飞片12~15 km/s速度发射.这些超高速驱动技术的发展,为空间碎片防护研究提供了坚实的技术支持. 相似文献
5.
Ahsan Zishan Cai Zhenfei Wang Shuai Ma Yangzhou Song Guangsheng Yu Mo Zhang Shihong Yang Weidong Wen Cuie Feng Xiaohua 《Journal of Solid State Electrochemistry》2021,25(7):2127-2137
Journal of Solid State Electrochemistry - To improve capacity and electrochemical performance of the cathode of Li-ion batteries, non-stoichiometric, vanadium-excess (V-excess)... 相似文献
6.
Liu J Liang C Zhang H Zhang S Tian Z 《Chemical communications (Cambridge, England)》2011,47(28):8040-8042
We report a universal strategy for doping hematite photoanode materials. Si-doped hematite nanosheets with a superlattice structure were first synthesised by hydrothermal treatment of a mixture of FeCl(3) agent and liquid phase laser ablation-derived-silicon colloids. The dopant site in Si-doped hematite was clarified at the atomic scale. 相似文献
7.
Zhang H Liang C Liu J Tian Z Wang G Cai W 《Langmuir : the ACS journal of surfaces and colloids》2012,28(8):3938-3944
A novel strategy was designed to prepare Ag cluster-doped TiO(2) nanoparticles (Ag/TiO(2) NPs) without addition of any chemical reducing agent and/or organic additive. A defect-rich TiO(x) species was generated by laser ablation in liquid (LAL) of a Ti target. The silver ions could be reduced and deposited on the surface of TiO(2) NPs through the removal of oxygen vacancies and defects; the TiO(x) species evolved into anatase NPs in a hydrothermal treatment process. The derived Ag/TiO(2) NPs are approximately 25 nm in size, with narrow size distribution. The Ag clusters are highly dispersed inside TiO(2) and less than 3 nm in size. The doped amount can be tuned by changing the concentration of Ag(+) ions. The as-synthesized Ag/TiO(2) NPs display improved photocatalytic efficiency toward pentachlorophenol (PCP) degradation. 相似文献
8.
Zhenfei Luo Zhiming Wu Tao Wang Xiangdong Xu Weizhi Li Wei Li Yadong Jiang 《Journal of Physics and Chemistry of Solids》2012,73(9):1122-1126
O-poor and O-rich thermochromic vanadium oxide (VOX) nanostructured thin films were prepared by applying reactive direct current magnetron sputtering and post-annealing in oxygen ambient. UV–visible spectrophotometer and spectroscopic ellipsometry were used to investigate the optical properties of films. It was found that, when the O-poor VOX thin film underwent semiconductor-to-metal transition, the values of optical conductivity and extinction coefficient in the visible region increased due to the existence of occupied band-gap states. This noticeable feature, however, was not observed for the O-rich film, which showed a similar optical behavior with the stoichiometric crystalline VO2 films reported in the literatures. Moreover, the O-poor VOX film exhibits consistent variations of transmission values in the visible/near-infrared region when it undergoes semiconductor-to-metal transition. 相似文献
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通过数值模拟, 计算冲击加载下样品经历一维应变加载过程和侧向稀疏过程产生的塑性功, 给出试样内部从冲击加载开始到进入回收桶前全过程的应力随时间变化的历程。结果表明:侧向稀疏过程开始后,样品在径向汇聚波的作用下受循环拉、压载荷作用,拉压循环的振幅在中等冲击压力下达到最大。如果振幅超过了材料的层裂强度,样品中心将发生拉伸破坏不能完整回收。侧向稀疏与一维应变加载产生的塑性功之比随冲击速度的增加而减小。在冲击速度为某临界值时,侧向稀疏产生的塑性功与一维应变加载产生的塑性功相等。在一定的冲击速度下,采用低初始屈服应力的材料可减轻侧向稀疏效应。对理想塑性材料的理论分析表明,侧向稀疏与一维应变加载产生的塑性功之比随冲击速度与屈服强度比值的增大而减小,与数值模拟结果一致。 相似文献
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