大功率固态脉冲形成线研究进展

固态化是脉冲功率技术发展的新趋势。综述了中国工程物理研究院流体物理研究所在大功率固态脉冲形成线方面的研究进展,给出了基于铁电陶瓷及玻璃-陶瓷复合材料的固态脉冲形成线绝缘强度、脉冲放电特性等方面的最新结果。对基于铁电陶瓷及玻璃-陶瓷复合材料的固态脉冲形成线的脉冲特性进行了分析和探索。     

理解全球化：基于“经济−社会−政治”体系共生演化视角的分析

20世纪80年代以来,一波超级全球化席卷全球。当今世界进入了百年未有之大变局,全球化陷入困境。应当如何理解当前的全球化困境？百年未有之大变局究竟变在何处？为此,可以从经济学、政治学、社会学与国际关系的综合视角,构建“经济−社会−政治”为一体的、动态演化的框架,以理解当今世界全球化的深层次矛盾。近一波全球化过程中全球经济力量与收入分配格局发生了变化,出现了发达经济体的经济停滞和新兴经济体的赶超,也导致了社会各阶层和不同社会群体的收入和财富差距发生巨变。全球化中全球经济基础的变化,即全球化中的全球经济力量格局变迁与收入分配恶化将对各国的经济和社会基础产生重大影响,进而影响上层建筑：国家的主导思想和意识形态。一个国家在国际关系和经济政策领域主导思想的演变,势必影响其对外战略和政策选择,进而影响本国的经济走向乃至全球化的历史进程。     

Characterization of Lignin Compounds at the Molecular Level: Mass Spectrometry Analysis and Raw Data Processing

Lignin is the second most abundant natural biopolymer, which is a potential alternative to conventional fossil fuels. It is also a promising material for the recovery of valuable chemicals such as aromatic compounds as well as an important biomarker for terrestrial organic matter. Lignin is currently produced in large quantities as a by-product of chemical pulping and cellulosic ethanol processes. Consequently, analytical methods are required to assess the content of valuable chemicals contained in these complex lignin wastes. This review is devoted to the application of mass spectrometry, including data analysis strategies, for the elemental and structural elucidation of lignin products. We describe and critically evaluate how these methods have contributed to progress and trends in the utilization of lignin in chemical synthesis, materials, energy, and geochemistry.     

SMA、OMMT对PA6/ABS共混物聚集态结构及性能影响的研究

采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)等手段研究了苯乙烯-马来酸酐共聚物(SMA)、有机蒙脱土(OMMT)对尼龙6(PA6)/丙烯腈-丁二烯-苯乙烯(ABS)共混物体系聚集态结构及性能的影响.结果表明,SMA与OMMT的加入均可提高PA6/ABS共混物体系的强度及模量,但加入OMMT后共混物的韧性有所下降,而PA6/ABS/SMA共混物的韧性随SMA含量的增加呈上升趋势.SMA、OMMT对PA6/ABS共混体系都有细化ABS分散相的作用,随SMA加入量的增加,ABS分散相尺寸逐渐减小,分布趋于均匀;当OMMT加入量在4 phr以内时,对ABS分散相粒径影响不大,超过4 phr后,随着OMMT含量的增加,ABS分散相的尺寸逐渐减小.XRD与TEM的分析结果表明,对PA6/OMMT(100/5)共混物,OMMT主要以剥离形态分布,同时也存在少量OMMT聚集体;PA6/ABS/OMMT共混物中OMMT则基本以剥离形态选择分布在PA6基体相中.     

A new asymmetric anthracene derivative with high mobility

An asymmetric anthracene derivative(4-HDPA) was designed and synthesized. With the optimization of proper scenario of fabrication process, top-contact thin film devices based on 4-HDPA exhibit mobility as high as 3.59 cm~2 V~(–1) s~(–1), while its singlecrystal devices exhibit mobility as high as 5.12 cm~2 V~(–1) s~(–1), which is higher than the symmetrical counterpart of 4-HDPA in both single-crystal and thin film devices.     

TOTAL CROSSS ECTIONS FOR ELECTRON SCATTERING FROM SIMPLE HYDROCARBON MOLECULES: C_2H_4,C_2H_6 AND C_3H_8

１ＩＮＴＲＯＤＵＣＴＩＯＮＳｉｍｐｌｅｈｙｄｒｏｃａｒｂｏｎｍｏｌｅｃｕｌｅｓａｓａｎｉｍｐｏｒｔａｎｔｃｏｍｐｏｎｅｎｔｉｎｔｈｅｐｌａｎｅｔａｒｙａｎｄｃｏｍｅｔａｒｙａｔｍｏｓｐｈｅｒｅａｎｄａｓａｄｏｍｉｎａｎｔｍａｔｅｒｉａｌｉｎｔｈｅｆｉ...     

A RESEARCH FOR POSITRON CORREL-ATION POLARIZATION POTENTIAL

ＡＲＥＳＥＡＲＣＨＦＯＲＰＯＳＩＴＲＯＮＣＯＲＲＥＬ－ＡＴＩＯＮＰＯＬＡＲＩＺＡＴＩＯＮＰＯＴＥＮＴＩＡＬＪｉａｎｇＹｕｈａｉＳｕｎＪｉｎｆｅｎｇＷａｎＬｉｎｇｄｅＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓ，ＨｅｎａｎＮｏｒｍａｌＵｎｉｖｅｒｓｉｔｙ，...     

金属接触电势差的最小能量解法

利用系统平衡时的能量取极小值的条件，讨论了两金属的接触电势差问题，求出接触电势差与费米能的关系。     

Exploring and elaborating the excited state mechanism of a novel AIE material 2-(5-(4-carboxyphenyl)-2-hydroxyphenyl)benzothiazole

A novel aggregation-induced emission material 2-(5-(4-carboxyphenyl)-2-hydroxyphenyl)benzothiazole (2-CHBT) has been investigated based on density functional theory (DFT) and time-dependent density functional theory (TDDFT) methods. Via reduced density gradient (RDG) versus sign(λ₂)ρ analyses, we firstly verify the formation of intramolecular hydrogen bond in 2-CHBT system. Analyzing the primary geometrical parameters in 2-CHBT and comparing the changes about infrared (IR) vibrational spectra, we confirm that the hydrogen bond O-H···N is strengthened in the S₁ state upon excitation. Exploring photo-excitation process, the frontier molecular orbitals (MOs) and charge density difference (CDD) analyses have been performed using TDDFT/B3LYP/TZVP theoretical level, based on which we verify the charge transfer phenomenon referring to the S₀?→?S₁ transition. And the CDD around the hydrogen bond moiety provides the tendency of ESIPT for 2-CHBT molecule. Comparing the energy gap between HOMO and LUMO orbitals in cyclohexane, toluene, chloroform, and DMSO solvents, we predict the ESIPT reaction might be more active in non-polar solvents. In addition, constructing potential energy curves and searching transition state (TS) structures, we further clarify the ESIPT mechanism and verify that non-polar solvents might facilitate the ESIPT process. Our simulated results reappear experimental spectral results and successfully explain experimental phenomenon.