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121.
122.
作为一种有竞争力的能源系统,Z箍缩聚变裂变混合堆(Z-FFR)正在开展概念研究,包层研究正是其中重要的一部分。建立了Z-FFR包层设计模型,分析了包层影响因素、中子平衡、通量与功率密度、燃耗等方面,表明该包层设计在50年内能量放大因子、氚增殖比和燃料增殖比的平均值分别为14.91,1.294和5.140,满足设计要求。针对聚变源的脉冲特性进行了包层的瞬态中子学分析,发现燃料区中子脉冲可分为聚变中子、瞬发裂变中子和缓发裂变中子脉冲三个部分,绝大部分热量约在0.01s内沉积。结果较完整地给出了Z-FFR包层的中子学参数,为概念研究提供了基础。 相似文献
123.
124.
N-(1-cyano-2-substituted phenylethyl) acetamides (4a-h) were synthesized by reduction of corresponding titled compounds 3a-h with NaTeH. The procedure was general and convenient for preparation of benzyl substituted acyclic Reissert compounds without using phenylacetaldehydes as starting materials. 相似文献
125.
In the presence of tetrakispyridine cobalt dichromate (CoPy4(HCrO4)2), pyridinium ylides and α,β-unsaturated aldehydes or ketones undergo 1,3-dipolar cycloaddition reactions followed by in situ aromatization to give 1-acyl substituted indolizines in moderate to good yields. 相似文献
126.
Anodic oxidation of a series 1,4-dihydropyridines were performed in acetonitrile-tetrabutylammonium perchlorate electrolyte solution at platinum electrode using controlled potential electrolysis. On the bases of electroanalytical results the electrochemical oxidation mechanism of 1,4-dihydropyridines could be designed ECEC process. As a result of two-electron oxidation corresponding pyridines were obtained in yields ranging from 85%–92%. The advantages of electrochemical synthesis of pyridine derivatives are simple reaction condition, low cost and of high purity products. 相似文献
127.
Dr. Zhengfei Dai Dr. Lichao Jia Dr. Guotao Duan Prof. Yue Li Dr. Hongwen Zhang Jingjing Wang Prof. Jinlian Hu Prof. Weiping Cai 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(40):13387-13395
Homogenous thin films are preferable for high‐performance gas sensors because of their remarkable reproducibility and long‐term stability. In this work, a low‐temperature fabrication route is presented to prepare crack‐free and homogenous metal oxide periodic porous thin films by oxygen plasma irradiation instead of high temperature annealing by using a sacrificial colloidal template. Rutile SnO2 is taken as an example to demonstrate the validity of this route. The crack‐free and homogenous porous thin films are successfully synthesized on the substrates in situ with electrodes. The SnO2 porous thin film obtained by plasma irradiation is rich in surface OH groups and hence superhydrophilic. It exhibits a more homogenous structure and lower resistance than porous films generated by annealing. More importantly, such thin films display higher sensitivity, a lower detection threshold (100 ppb to acetone) and better durability than those that have been directly annealed, resulting in enhanced gas‐sensing performance. The presented method could be applied to synthesize other metal oxide homogenous thin films and to fabricate gas‐sensing devices with high performances. 相似文献
128.
In this paper, we give a lower bound exp(2.2 × 10~8 ) for those discriminants of real quadratic fields Q(√ d) with d= N~2-4 and h(d)=1. 相似文献
129.
Dailiang Zhang Linlin Wang Xi Yuan Yijun Gong Hongwen Liu Jing Zhang Xiaobing Zhang Yanlan Liu Weihong Tan 《Angewandte Chemie (International ed. in English)》2020,59(2):695-699
Fluorescence visualization (FV) in the near‐infrared (NIR) window promises to break through the signal‐to‐background ratio (SBR) bottleneck of traditional visible‐light‐driven FV methods. However, straightforward NIR‐FV has not been realized, owing to the lack of methods to readily transduce NIR responses into instrument‐free, naked eye‐recognizable outputs. Now, an initiation–input–transduction platform comprising a well‐designed NIR fluorophore as the signal initiator and lanthanide‐doped nanocrystals as the transducer for facile NIR‐FV is presented. The analyte‐induced off–on NIR signal serves as a sensitizing switch of transducer visible luminescence for naked‐eye readout. The design is demonstrated for portable, quantitative detection of phosgene with significantly improved SBR and sensitivity. By further exploration of initiators, this strategy holds promise to create advanced NIR‐FV probes for broad sensing applications. 相似文献
130.
Hongwen Chen Bei-Er Jia Xinsheng Lu Dr. Yichuan Guo Rui Hu Dr. Rabia Khatoon Prof. Dr. Lei Jiao Prof. Dr. Jianxing Leng Prof. Dr. Liqiang Zhang Prof. Dr. Jianguo Lu 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(42):9973-9983
Tin diselenide (SnSe2), as an anode material, has outstanding potential for use in advanced lithium-ion batteries. However, like other tin-based anodes, SnSe2 suffers from poor cycle life and low rate capability due to large volume expansion during the repeated Li+ insertion/de-insertion process. This work reports an effective and easy strategy to combine SnSe2 and carbon nanotubes (CNTs) to form a SnSe2/CNTs hybrid nanostructure. The synthesized SnSe2 has a regular hexagonal shape with a typical 2D nanostructure and the carbon nanotubes combine well with the SnSe2 nanosheets. The hybrid nanostructure can significantly reduce the serious damage to electrodes that occurs during electrochemical cycling processes. Remarkably, the SnSe2/CNTs electrode exhibits a high reversible specific capacity of 457.6 mA h g−1 at 0.1 C and 210.3 mA h g−1 after 100 cycles. At a cycling rate of 0.5 C, the SnSe2/CNTs electrode can still achieve a high value of 176.5 mA h g−1, whereas a value of 45.8 mA h g−1 is achieved for the pure SnSe2 electrode. The enhanced electrochemical performance of the SnSe2/CNTs electrode demonstrates its great potential for use in lithium-ion batteries. Thus, this work reports a facile approach to the synthesis of SnSe2/CNTs as a promising anode material for lithium-ion batteries. 相似文献