利用费曼积分计算引力场的自由传播子

采用维数正规化的方法推导了引力场的费曼规则,并运用Faddeev-Popov计算法求得了虚粒子的引力场自由传播子.     

A reduced FE formulation based on POD method for hyperbolic equations

A proper orthogonal decomposition (POD) method was successfully used in the reduced-order modeling of complex systems. In this paper, we extend the applications of POD method, namely, apply POD method to a classical finite element (FE) formulation for second-order hyperbolic equations with real practical applied background, establish a reduced FE formulation with lower dimensions and high enough accuracy, and provide the error estimates between the reduced FE solutions and the classical FE solutions and the implementation of algorithm for solving reduced FE formulation so as to provide scientific theoretic basis for service applications. Some numerical examples illustrate the fact that the results of numerical computation are consistent with theoretical conclusions. Moreover, it is shown that the reduced FE formulation based on POD method is feasible and efficient for solving FE formulation for second-order hyperbolic equations.     

BEPCⅡ电子环寄生模损失测量

BEPCII在设计阶段从束流不稳定性和寄生模损失角度对阻抗提出了限制,但在BEPCII运行中寄生模损失是影响高流强稳定运行的因素之一。针对BEPCII电子环的寄生模损失进行了测量,主要是基于同步相移随流强的微小变化、束流功率测量和高阶模吸收器的功率。测量结果表明：两种方法对比测量全环寄生模损失,结果重复可信,且全环寄生模损失是超导腔寄生模损失的4~5倍。     

求解修正的Helmholtz方程关于非光滑区域问题

研究了修正的（纯虚波数）Helmholtz方程在阻尼边界条件下,求解含单个角点的闭区域问题.通过采用单双层混合位势来表示其解,进而对其角型区域进行求解.最后,通过数值例子来说明此方法的可行性与可靠性.     

硒镓银晶体的生长与品质研究

采用５～６Ｎ的高纯Ａｇ，Ｇａ，Ｓｅ单质按ＡｇＧａＳｅ２的化学配比配料，在１１００℃下合成了单相的ＡｇＧａＳｅ２多晶原料．用改进的布里奇曼法生长出２２ｍｍ×７０ｍｍ的ＡｇＧａＳｅ２单晶体，并对其品质进行了研究．结果表明：生长的晶体完整性好，具有较高的光学质量，用于对１０．６μｍ的ＣＯ２激光倍频，获得了８．２％的能量转换效率     

Interfacial Engineering of Magnesiophilic Coordination Layer Stabilizes Mg Metal Anode

Rechargeable magnesium batteries (RMBs) are seriously plagued by the direct exposure of the Mg anode to the electrolyte components, leading to spontaneous and electrochemical side reactions and interfacial passivation. Herein, a benign coordination layer is constructed at the Mg/electrolyte interface where aniline with a strong magnesiophilic amine group and high stability to Mg is chosen as representative, which has higher adsorption energy than DME (1,2-dimethoxyethane) and trace water. This Mg coordination environment mitigates side reactions, forming a non-passivating interface consisting of aniline and much fewer by-products after several cycles. Therefore, the Mg symmetrical cell operates with a low overpotential and uniform Mg⁰ deposition. This interfacial coordination can also be adopted for Mg anode protection in various electrolyte cases of Mg(TFSI)₂ electrolyte systems.     

Repurposing of antitumor drug candidate Quisinostat lead to novel spirocyclic antimalarial agents

Antimalarial chemotherapies endowed with effectiveness against drug-resistant parasites and good safety are urgently required in clinical.Our previous research revealed that clinical phase II antitumor drug Quisinostat was a promising antimalarial prototype by inhibiting the activity of Plasmodium falciparum(P.falciparum) histone deacetylase(PfHDAC).Herein,30 novel spirocyclic linker derivatives were designed and synthesized based on Quisinostat as lead compound,and then their antimalarial activities and cytotoxicity were systematically evaluated.Among them,compounds 8 and 27 could effectively eliminate wild-type and multi-drug resistant P.falciparum parasites,and display weakened cytotoxicity and good metabolic stability.Western blot assay demonstrated that they could inhibit PfHDAC activity like Quisinostat.In addition,both 8 and 27 showed certain antimalarial efficacy in rodent malaria model,and the animal toxicity of 8 was significantly improved compared with Quisinostat.Overall,8 and 27 were structurally novel PfHDAC inhibitors and provided prospective prototype for further antimalarial drug research.     

湘西地区军事本草植物资源研究（Ⅲ）——治疗蛇虫伤害植物资源调查分析

为了解湘西地区治疗蛇虫伤害植物资源,构建军事治疗蛇虫伤害植物本草资源库,采用实地取样调查并结合文献查阅等方法,对湘西地区治疗蛇虫伤害的军事本草资源进行综合性分析.结果表明：湘西地区治疗蛇虫伤害的植物共284种,隶属94科207属,生活习性以草本为主,生境以林中为主;水平分布北部比南部丰富,垂直分布随海拔升高呈现先增加后减少的趋势,其中600~1 299 m海拔范围内分布最多;区系地理成分复杂多样,科以世界分布和泛热带分布为主,属以泛热带分布和北温带分布为主,种以东亚分布、中国特有分布和热带亚洲分布为主;药用部位以全草可药用植物居多,用药方法多样,主要为外用取适量鲜品捣烂敷患处、内服取适量煎汤服用.当前湘西地区治疗蛇虫伤害植物资源丰富,但开发利用程度低,应在可持续利用的范围内加强研究和开发.     

喜马拉雅山亚东段蚂蚁群落研究

为了揭示喜马拉雅山蚂蚁多样性规律,采用样地调查法研究了喜马拉雅山亚东段蚂蚁群落。在北坡、山间谷地和南坡采集蚂蚁标本12 354头,隶属于2亚科8属12种。北坡和山间谷地蚂蚁群落的优势种均为光亮黑蚁(Formica candida Smith),而南坡的优势种为史密西红蚁(Myrmica smythiesii Forel)。亚东段不同海拔样地蚂蚁群落多样性指数中Fisherα指数为0~0.95,Shannon-Wiener指数为0~0.98,显示该地段物种多样性非常低。利用Estimate S 9.1.0程序对该地区蚂蚁物种丰富度进行估计并绘制物种累积曲线,结果表明蚂蚁物种实际观察值接近该地区蚂蚁丰富度估计值。南北坡蚂蚁物种丰富度随海拔升高先增加后降低,丰富度垂直分布格局符合"中域效应"假说。相似性系数分析表明,该地段蚂蚁群落组成和分布受植被类型和海拔影响。     

多芯片组件的互连与灵敏度分析

特性尺寸的减小、系统复杂性的增加和工作速度的提高已使互连成为影响电路性能的重要因素,因此如何快速而有效地进行互连分析是很重要的．在对传输线进行分析后发展了一种用ＡＷＥ对含耦合传输线的电路进行分析的方法．通过把矩阵指数函数展开可以方便地求出应用ＡＷＥ方法时需要求得的系数．该方法仅需进行矩阵的加法、乘法运算和一次ＬＵ分解,能快速而有效地求取含多根耦合传输线的互连网络的瞬态响应．在电路设计中灵敏度很有用,因为它是优化、统计分析、可靠性分析和面向性能设计的基础．将该方法推广应用于灵敏度分析得到了一种求取灵敏度的新方法．与传统的ＳＰＩＣＥ方法相比,该方法是高效的．