HL-2A装置Nd:YAG激光汤姆逊散射多道测量系统

 利用Nd:YAG激光汤姆逊散射多道测量系统对等离子体多空间点的电子温度和密度进行了测量。用标准光源和电扫描单色仪构成的标定系统对散射光谱的响应系数进行了标定。给出了等离子体中心附近6空间点的温度和密度的测量结果,时间分辨率为100 ms,空间分辨率约为2.2 cm。对实验结果的不确定度进行了估计,为-12% ~ 12%。实验结果证明：系统可测量等离子体温度的空间范围为-35 ~ -3 cm,实验数据稳定可靠。     

Synergy of Iron Doping and Cyano Groups for Enhanced Photocatalytic Hydrogen Production over C3N4

Improving the insufficient carrier separation dynamics is still of significance in carbon nitride (C₃N₄) research. Extensive research has been devoted to improving the carrier separation efficiency through a single strategy, while ignoring the synergistic enhancement effect produced by coupling two or more conventional strategies. Herein, we reported the fabrication of cyano group-containing Fe-doped C₃N₄ porous materials via direct co-calcination of iron acetylacetonate and melamine for synergistically improving the photocatalytic performance. Iron acetylacetonate can promote the generation of cyano groups and form Fe-doping in C₃N₄, thereby increasing the visible-light absorption and reactive sites. Further, the internal donor-acceptor system formed by cyano groups and Fe-doped sites promoted charge carrier separation and inhibited the radiation recombination of e⁻-h⁺ pairs. The optimized photocatalytic activity of Fe−CN-2 sample was 4.5 times of bulk C₃N₄ (BCN).     

ELASTO-PLASTIC DYNAMIC BUCKLING AND POSTBUCKLING OF SQUARE PLATES UNDER SOLID-FLUID SLAMMING

The elasto-plastic dynamic buckling and postbuckling phenomena ofsquare plates subjected to in-plane solid-fluid slamming are investigated.According tothe plate's response,the critical criteria for dynamic buckling,dynamic plasticity andplasti(?)collapse are defined,and the corresponding critical impulses are presented.Meanwhile,dynamic buckling modes and collapse models are observed.The effects ofdifferent boundary conditions and loading histories on the properties of buckling andpostbuckling are discussed.     

低剂量三氯化钐对实验性非胰岛素依赖型糖尿病大鼠胰岛的影响

观察了经腹腔注射低剂量三氯化钐（０．０５ｍｇ／ｋｇ）对链脲佐菌素引志的非胰岛素依赖型糖尿病（ＮＤＩＤＤＭ）大鼠胰岛形态和功能的影响。结果表明，三氯化钐治疗组糖耐量改善、血清胰岛水平长高、血清胰镐血糖素水平降低、平均单个胰岛面积和胰岛β细胞数量明显增多，肝细胞内糖原含量增多。提示低剂量三氯化钐对实验性ＮＩＤＤＭ大鼠有一定的治疗作用。     

Catalytic Conversion of Polysulfides on Single Atom Zinc Implanted MXene toward High‐Rate Lithium–Sulfur Batteries

Although lithium–sulfur (Li–S) batteries are one of the most promising energy storage devices owing to their high energy densities, the sluggish reaction kinetics and severe shuttle effect of the sulfur cathodes hinder their practical applications. Here, single atom zinc implanted MXene is introduced into a sulfur cathode, which can not only catalyze the conversion reactions of polysulfides by decreasing the energy barriers from Li₂S₄ to Li₂S₂/Li₂S but also achieve strong interaction with polysulfides due to the high electronegativity of atomic zinc on MXene. Moreover, it is found that the homogenously dispersed zinc atoms can also accelerate the nucleation of Li₂S₂/Li₂S on MXene layers during the redox reactions. As a result, the sulfur cathode with single atom zinc implanted MXene exhibits a high reversible capacity of 1136 mAh g^?1. After electrode optimization, a high areal capacity of 5.3 mAh cm^?2, high rate capability of 640 mAh g^?1 at 6 C, and good cycle stability (80% capacity retention after 200 cycles at 4 C) can be achieved.     

应用扫描电镜拉伸台测定激光熔覆层结合强度

采用扫描电镜的拉伸台测定了合金表面激光熔覆层与基体的结合强度，分析了基材预热温度对界面结合强度的影响，观察了界面裂纹的形成及扩展过程。结果表明，这种方法较为准确地测量了熔支与基体之间的结合强度。     

Dual entropic and enthalpic processes in the lower critical solution temperature phase separation of poly(vinyl methyl ether) aqueous solutions

In the lower critical solution temperature phase separation of poly(vinyl methyl ether) aqueous solutions, the process corresponding to the weakening of the hydrogen bond interaction with increasing temperature is dominant and occurs over the entire concentration region of solutions and over a broad temperature range from 30 to 41°C, giving rise to the energetic enthalpic effect during phase separation, while the conformational change, that is, collapse of the swollen polymer coils, occurs only in the swelling polymer solution when the water concentration is above 38.3 wt %, giving rise to the entropic effect during phase separation. In addition, the entropic process corresponding to the collapse of the polymer coils occurs in a much narrow theta temperature range from 35.5 to 37°C. If the solution is held at a constant temperature for a sufficiently long time, 90% collapse of the polymer coils occurs in only the 0.5 °C temperature region between 35.5 and 36°C. Accordingly, in the enthalpic process, the most dramatic blueshift of the νC‐O bond peak occurs in the temperature range between 35 and 41°C, while this blueshift is only approximately 2 cm^?1 in the temperature range from 30 to 35°C, prior to the collapse of the polymer coils due to the entropic effect. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019 , 57, 323–330     

Inertial microfluidics: Recent advances

Inertial microfluidics has attracted significant attentions in last decade due to its superior advantages of high throughput, label- and external field-free operation, simplicity, and low cost. A wide variety of channel geometry designs were demonstrated for focusing, concentrating, isolating, or separating of various bioparticles such as blood components, circulating tumor cells, bacteria, and microalgae. In this review, we first briefly introduce the physics of inertial migration and Dean flow for allowing the readers with diverse backgrounds to have a better understanding of the fundamental mechanisms of inertial microfluidics. Then, we present a comprehensive review of the recent advances and applications of inertial microfluidic devices according to different channel geometries ranging from straight channels, curved channels to contraction-expansion-array channels. Finally, the challenges and future perspective of inertial microfluidics are discussed. Owing to its superior benefit for particle manipulation, the inertial microfluidics will play a more important role in biology and medicine applications.     

A multisymplectic explicit scheme for the modified regularized long-wave equation

In this paper, we derive a new 10-point multisymplectic scheme for the modified regularized long-wave equation. The new scheme is an explicit scheme in the sense that the third time level does not include nonlinear terms. Numerical results indicate that the new scheme not only provides satisfied numerical solutions, but also preserves three invariants of motion very well.     

钍(Ⅳ)与水杨醛二胺类双希夫碱配合物的合成与表征

钍（Ⅳ）与水杨醛二胺类双希夫碱配合物的合成与表征毕彩丰，范玉华，张家祥（山东建材学院应用化学系，济南２５００２２）关键词硝酸钍，双希夫碱，配合物过渡及希土金属离子的希夫碱类配合物已有不少报道，但钢系离子社（［Ｖ）的双希大碱类配合物研究未见报道．本文首...