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71.
72.
采用酸处理方法对CoPd/TiO2催化剂进行改性,并将酸改性催化剂用于温和条件下CH4-CO2梯阶转化直接合成C2含氧化合物(乙酸和乙醇)的反应。在150~300℃考察了浸酸方式和不同种类酸处理对催化剂活性和选择性的影响。采用X射线衍射(XRD)、X射线光电子能谱(XPS)、NH3程序升温脱附(NH3-TPD)和N2吸附对催化剂进行了表征。结果表明,酸改性明显提高了CoPd/TiO2上C2含氧化合物的生成速率和选择性。浸酸方式对催化剂性能和结构有显著影响,先用酸浸渍载体然后再浸渍活性金属所得催化剂具有更高的活性。在H3PO4、HNO3和HCl中,H3PO4浸渍的催化剂活性最佳,在150℃时C2含氧化合物(乙酸和乙醇)的生成速率为3365 μg/(g·h),选择性达到91%。 相似文献
73.
针对中空和非中空触发电极结构的两间隙开关,进行了触发击穿特性实验,对比两个间隙的击穿抖动和通道数,分析了串级两间隙的相互影响机制。实验结果表明:两只开关触发间隙击穿抖动和通道数变化规律基本一致;非中空开关自击穿间隙击穿抖动随工作系数的增大而减小,最小约3 ns,中空开关自击穿间隙击穿抖动始终约1 ns;非中空开关自击穿间隙难形成多通道放电,中空开关自击穿间隙通道数明显多于其他间隙。触发间隙首先放电产生紫外光,通过触发电极中空通孔预先照射自击穿间隙产生初始电子,是自击穿间隙击穿抖动减小、通道数增加的主要作用机制。 相似文献
74.
Shuangjiang Feng Shuxue Wang Yuanfei Lv Lei He Qiurong Li Tao Zhang 《Polymer International》2019,68(3):494-502
Hydrogels have been widely used as mild biomaterials due to their bio‐affinity, high drug loading capability and controllable release profiles. However, hydrogel‐based carriers are greatly limited for the delivery of hydrophobic payloads due to the lack of hydrophobic binding sites. Herein, nano‐liposome micelles were embedded in semi‐interpenetrating poly[(N‐isopropylacrylamide)‐co‐chitosan] (PNIPAAm‐co‐CS) and poly[(N‐isopropylacrylamide)‐co‐(sodium alginate)] (PNIPAAm‐co‐SA) hydrogels which were responsive to both temperature and pH, thereby establishing tunable nanocomposite hydrogel delivery systems. Nano‐micelles formed via the self‐assembly of phospholipid could serve as the link between hydrophobic drug and hydrophilic hydrogel due to their special amphiphilic structure. The results of transmission and scanning electron microscopies and infrared spectroscopy showed that the porous hydrogels were successfully fabricated and the liposomes encapsulated with baicalein could be well contained in the network. In addition, the experimental results of response release in vitro revealed that the smart hydrogels showed different degree of sensitiveness under different pH and temperature stimuli. The results of the study demonstrate that combining PNIPAAm‐co‐SA and PNIPAAm‐co‐CS hydrogels with liposomes encapsulated with hydrophobic drugs is a feasible method for hydrophobic drug delivery and have potential application prospects in the medical field. © 2018 Society of Chemical Industry 相似文献
75.
为解决兰州重离子加速器(HIRFL)数据中心资源利用率低下、硬件和维护成本较高等问题,HIRFL数据中心正在向虚拟化集群模式进行迁移。本文以华为Fusion Compute虚拟化平台为基础,构建了HIRFL数据库的迁移方案。通过物理主机、虚拟机计算资源、内存、存储和网络资源性能优化,提出了1套完整的HIRFL数据库虚拟机性能优化方案。采用业界主流的数据库性能测试工具Benchmark Factory对迁移前后的数据库进行了测试,对比实验表明,本文提出的方案具有有效性和可行性,降低了数据中心的运行和维护成本,提升了HIRFL数据库系统的安全性和稳定性。 相似文献
76.
Wang Tao Semenov Sergey Wang Engang Delannoy Yves Fautrelle Yves Budenkova Olga 《Metallurgical and Materials Transactions B》2019,50(6):3039-3054
Metallurgical and Materials Transactions B - Modeling of equiaxed solidification is vital for understanding the solidification process of metallic alloys. In this work, an extended literature... 相似文献
77.
Yifan Zhang Shaowei Bo Tao Feng Xialing Qin Yilin Wan Shanshan Jiang Chunxiao Li Jing Lin Tianfu Wang Xin Zhou Zhong‐Xing Jiang Peng Huang 《Advanced materials (Deerfield Beach, Fla.)》2019,31(21)
To design a clinically translatable nanomedicine for photodynamic theranostics, the ingredients should be carefully considered. A high content of nanocarriers may cause extra toxicity in metabolism, and multiple theranostic agents would complicate the preparation process. These issues would be of less concern if the nanocarrier itself has most of the theranostic functions. In this work, a poly(ethylene glycol)‐boron dipyrromethene amphiphile (PEG‐F54‐BODIPY) with 54 fluorine‐19 (19F) is synthesized and employed to emulsify perfluorohexane (PFH) into a theranostic nanoemulsion (PFH@PEG‐F54‐BODIPY). The as‐prepared PFH@PEG‐F54‐BODIPY can perform architecture‐dependent fluorescence/photoacoustic/19F magnetic resonance multimodal imaging, providing more information about the in vivo structure evolution of nanomedicine. Importantly, this nanoemulsion significantly enhances the therapeutic effect of BODIPY through both the high oxygen dissolving capability and less self‐quenching of BODIPY molecules. More interestingly, PFH@PEG‐F54‐BODIPY shows high level of tumor accumulation and long tumor retention time, allowing a repeated light irradiation after a single‐dose intravenous injection. The “all‐in‐one” photodynamic theranostic nanoemulsion has simple composition, remarkable theranostic efficacy, and novel treatment pattern, and thus presents an intriguing avenue to developing clinically translatable theranostic agents. 相似文献
78.
79.
80.
Tao Sun Zong-Jun Li Yong-Feng Zhi Yin-Juan Huang Hong Jin Fan Qichun Zhang 《Advanced functional materials》2021,31(16):2010049
Aqueous rechargeable zinc-ion batteries (ZIBs) have attracted considerable attention as a promising candidate for low-cost and high-safety electrochemical energy storage. However, the advancement of ZIBs is strongly hindered by the sluggish ionic diffusion and structural instability of inorganic metal oxide cathode materials during the Zn2+ insertion/extraction. To address these issues, a new organic host material, poly(2,5-dihydroxy-1,4-benzoquinonyl sulfide) (PDBS), has been designed and applied for zinc ion storage due to its elastic structural factors (tunable space and soft lattice). The aqueous Zn-organic batteries based on the PDBS cathode show outstanding cycling stability and rate capability. The coordination moieties (O and S) display the strong electron donor character during the discharging process and can act as the coordination arms to host Zn2+. Also, under the electrochemical environment, the malleable polymer structure of PDBS permits the rotation and bending of polymer chains to facilitate the insertion/extraction of Zn2+, manifesting the superiority and uniqueness of organic electrode materials in the polyvalent cation storage. Finally, quasi-solid-state batteries based on aqueous gel electrolyte demonstrate highly stable capacity under different bending conditions. 相似文献