排序方式: 共有76条查询结果,搜索用时 15 毫秒
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Qiang Chenxu Hao Yuxin Zhang Wei Li Jinqiang Yang Shaowu Cao Yuteng 《应用数学和力学(英文版)》2021,42(11):1555-1570
Applied Mathematics and Mechanics - The concept of local resonance phononic crystals proposed in recent years provides a new chance for theoretical and technical breakthroughs in the structural... 相似文献
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MoS2 Nanosheets Supported on 3D Graphene Aerogel as a Highly Efficient Catalyst for Hydrogen Evolution 下载免费PDF全文
Yufei Zhao Xiuqiang Xie Jinqiang Zhang Dr. Hao Liu Hyo‐Jun Ahn Prof. Kening Sun Prof. Guoxiu Wang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(45):15908-15913
The development of efficient catalysts for electrochemical hydrogen evolution is essential for energy conversion technologies. Molybdenum disulfide (MoS2) has emerged as a promising electrocatalyst for hydrogen evolution reaction, and its performance greatly depends on its exposed edge sites and conductivity. Layered MoS2 nanosheets supported on a 3D graphene aerogel network (GA‐MoS2) exhibit significant catalytic activity in hydrogen evolution. The GA‐MoS2 composite displays a unique 3D architecture with large active surface areas, leading to high catalytic performance with low overpotential, high current density, and good stability. 相似文献
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Ce∶LuAG晶体是一种性能优良的闪烁材料,但采用提拉法生长Ce∶LuAG时,经常出现开裂和包裹物缺陷。本文通过理论与实践相结合的方式分析了温度梯度、提拉速度、晶体旋转速度和热应变等因素对晶体产生缺陷的影响,并提出了解决办法,给出了适合生长优质Ce∶LuAG晶体的工艺参数:熔体上方温度梯度在5 ℃/mm左右,放肩角度在30°~60°,提拉速度1.0~1.5 mm/h,晶体旋转速度15~25 r/min。最后成功生长出直径30 mm、等径长50 mm质量较为完好的Ce∶LuAG单晶,晶体内核心面积小。 相似文献
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Jinqian Yu Jinqiang Zhang Xiaowei Sun Chenghong Xiao Xiao Wang Tao Zhou 《Journal of separation science》2020,43(7):1265-1274
The roots of Dipsacus asper Wall as a commonly used traditional Chinese medicine are used for tonifying liver and kidney and strengthening bones and muscles. However, an effective separation strategy for comprehensive and rapid separation of the main active compounds from the roots of D. asper is nonexistent. This investigation provided an effective separation method based on AB‐8 macroporous resin column chromatography using different ratios of ethanol in water and two different modes of high‐speed countercurrent chromatography with salt‐containing solvent system for rapid enrichment and separation from the roots of D. asper. The macroporous resin column chromatography was performed on AB‐8 resin using ethanol in water ratios of 10, 30, 40, 50, and 80% as the optimized enrichment conditions for iridoid glycosides and triterpenoid saponins with different polarities. For high‐speed countercurrent chromatography separation, the conventional and recycling modes were combined together to develop a strategy for 12 compounds ( 1 – 12 ) from the enriched parts of 30, 40, and 80% ethanol, including six high‐polarity iridoid glycosides ( 1 – 6 ) using inorganic salt‐containing solvent system and six triterpenoid saponins ( 7 – 12 ). Recycling high‐speed countercurrent chromatography separation was successfully applied to separate two isomers ( 9 and 10 ) after 11 cycles. 相似文献
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Synthesis of Single‐Crystalline Spinel LiMn2O4 Nanorods for Lithium‐Ion Batteries with High Rate Capability and Long Cycle Life 下载免费PDF全文
Xiuqiang Xie Dr. Dawei Su Dr. Bing Sun Jinqiang Zhang Prof. Dr. Chengyin Wang Prof. Dr. Guoxiu Wang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(51):17125-17131
The long‐standing challenge associated with capacity fading of spinel LiMn2O4 cathode material for lithium‐ion batteries is investigated. Single‐crystalline spinel LiMn2O4 nanorods were successfully synthesized by a template‐engaged method. Porous Mn3O4 nanorods were used as self‐sacrificial templates, into which LiOH was infiltrated by a vacuum‐assisted impregnation route. When used as cathode materials for lithium‐ion batteries, the spinel LiMn2O4 nanorods exhibited superior long cycle life owing to the one‐dimensional nanorod structure, single‐crystallinity, and Li‐rich effect. LiMn2O4 nanorods retained 95.6 % of the initial capacity after 1000 cycles at 3C rate. In particular, the nanorod morphology of the spinel LiMn2O4 was well‐preserved after a long‐term cycling, suggesting the ultrahigh structural stability of the single crystalline spinel LiMn2O4 nanorods. This result shows the promising applications of single‐crystalline spinel LiMn2O4 nanorods as cathode materials for lithium‐ion batteries with high rate capability and long cycle life. 相似文献
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调节待测体系的pH值是配位滴定中一种重要的选择性滴定手段。采用CTE1.0程序计算了不同酸度条件下的终点误差,同时用配位滴定法测定了模拟样品和市售药品中的锌含量。计算结果和实测结果均表明,在不含钙离子的待测体系中,测定锌离子含量的合适酸度条件为pH=6;在钙、锌混合离子溶液中,测定锌含量的合适酸度条件为pH=5。平行测定实验的相对标准误差为1.63%,加标回收率为99.1%-101.8%。 相似文献
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沉淀分离ICP-AES法测定高纯阴极铜中铅铋碲 总被引:7,自引:0,他引:7
研究了用虱氧化铁共沉淀分离富集高纯阴极铜中铅、铋和碲的最佳条件与ICP-AES法的最佳工作条件。在选定的最佳条件下测铅、铋和碲的检出限分别为0.0034,0.013和0.0077μg·ml-1,回收率分别为97.8%-100.8%、95.5%-106.5%和98.5-100.5%。测定高纯阴极铜中铅、铋和碲,结果满意。 相似文献
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