反导火力单元空间杀伤区内拦截概率研究

拦截概率是评价反导作战效能的重要指标,对交战前任务规划至关重要。选取某一拦截弹建立其在空间的可达集区域,针对中段反导逆轨拦截情况,确立其在空间中的杀伤区。针对杀伤区内任一点可能为拦截点的情况,对某一来袭导弹的弹道轨迹,选取可拦截弧段上的理论拦截点,通过在选取不同高度上的理论拦截点上,调整拦截弹的发射位置,从而得到拦截点在杀伤区内不同高度,不同距离以及在不同的交汇角时对拦截概率的影响。为反导作战的阵地部署研究和交战策略提供了一定的参考。     

An analysis of peak overpressures in vented gaseous explosions

Experimental data from vented explosion tests using stoichiometric methane–air and 18% hydrogen–air mixtures in a 63.7 m³ chamber with a 2.7 or 5.4 m² vent are presented. Results from experiments conducted using stoichiometric propane–air in 2.42 m³ vessel with a 0.26 m² vent are also reported. The tests were focused on the effect of fuel, enclosure size, ignition location, vent size, and obstacles on the pressure development of a propagating flame in a vented enclosure. The dependence of the maximum pressure generated on the experimental parameters was analyzed. It was found that the pressure maxima may be caused by pressure transients controlled by the interplay of the maximum-flame area, the burning velocity, and the overpressure generated by an external explosion. A simple model was proposed to estimate the maximum pressure for each of the main pressure transients. The model was found to agree with the experimental data within the experimental uncertainty.     

怀化高速洪江服务区雷电灾害的防护

为降低山区高速公路雷电灾害的风险，以怀化高速洪江服务区为试点，选取周边2007-2016年的闪电数据，结合区内环境和天气系统，采用数理统计方法分析服务区的雷电特征、雷电风险等级等.洪江服务区属多雷或强雷地带，雷电风险逐年递增，雷电的密度呈东多西少、强度呈西强东弱的趋势，特别是偏东和东北方位约200 m（服务区加油站附近）以远是大片的高雷区.西风带与东风波天气系统会对服务区雷电产生不同的影响.建议考虑服务区环境和雷电风险等级，按标准对防雷设施进行检测整改，加强偏东和东北方位的防雷设施建设，开展雷电灾害防护宣传等以减少雷电灾害的发生.     

Forming mechanism of ink layer on the printing plate in inking process and influencing factors of its thickness

Ink layer thickness on the printing plate greatly influences uniformity of ink transferred to the substrates , which is an important indicator of printing quality , so the study of ink layer and its thick-ness is important for improving the quality of printing products .Ansys CFX is used here to build a model of ink fluid adhering to lower vibrator roller , form inking roller , and printing plate for analy-zing ink transferring in inking process .Ink layer thickness on each position of the model is acquired to analyze the forming mechanism of ink layer on printing plate , as well as the influence of oscilla-tion speed of lower vibrator roller and dot area percentage of plate on ink layer thickness of printing plate.It can be concluded that , in the case of fixed ink supplying amount , ink layer thickness in-creases along with the increasing of oscillation speed , and decreases when the dot area percentage is getting larger and the minimum is got when the dot area percentage is 100%.At last , experiment of plate inking on print ability tester verifies the correctness of the simulation analysis .     

倾斜储油罐的变位识别与罐容表标定

本文使用分析的方法研究了倾斜储油罐的变位识别与罐容表标定问题,精确地给出了油位高度与储油量之间的关系式.     

豫南大别山区不同海拔高度茶树主要品质成分变化

采用生化分析和高效液相色谱法,分析了豫南大别山区不同海拔高度茶树的主要成分。结果表明,其主要品质成分的含量为:水浸出物44.52%~46.99%(质量分数,以下同),茶多酚25.49%~30.03%,儿茶素208.49~234.18mg·g-1,氨基酸3.86%~4.81%,可溶性糖4.61%~5.22%,叶绿素1.26~1.98mg·g-1,咖啡碱3.11%~3.72%。综合分析,随海拔高度的升高,茶叶品质逐渐提升,海拔700m处的茶叶品质最佳。     

基于6LoWPAN６的PRL路由协议研究

鲁迅对日本文化和日本国民性的关注更多的是从中国国民性批判的角度来进行的,他的日本认识包含两个层面:一是作为国民性改造过程中的一个参照物的日本,他过多地强调日本民族的优点而少谈日本民族的缺点,就在于他是以日本民族的优点作为救治本民族缺点的"药",日本民族的优点的选择是出于本民族现实需要的目的;二是作为独立民族文化的日本,他摆脱了中日冲突背景下的激进和狭隘的民族主义,以冷静的态度进行中日文化的交流,以期促成民族间的理解和友好。     

FEW: A workflow tool for free energy calculations of ligand binding

In the later stages of drug design projects, accurately predicting relative binding affinities of chemically similar compounds to a biomolecular target is of utmost importance for making decisions based on the ranking of such compounds. So far, the extensive application of binding free energy approaches has been hampered by the complex and time‐consuming setup of such calculations. We introduce the free energy workflow (FEW) tool that facilitates setup and execution of binding free energy calculations with the AMBER suite for multiple ligands. FEW allows performing free energy calculations according to the implicit solvent molecular mechanics (MM‐PB(GB)SA), the linear interaction energy, and the thermodynamic integration approaches. We describe the tool's architecture and functionality and demonstrate in a show case study on Factor Xa inhibitors that the time needed for the preparation and analysis of free energy calculations is considerably reduced with FEW compared to a fully manual procedure. © 2013 Wiley Periodicals, Inc.     

Antibacterial and Antifungal Activities—Surface Active Properties Relation of Novel Dischiff Base Cationic Gemini Amphiphiles Bearing Homogeneous Hydrophobes

A novel series of cationic Gemini amphiphiles containing Dischiff base species were synthesized and their chemical structures were determined using different analytical tools. Their surface properties were determined using surface tension measurements. The adsorption and micellization thermodynamic parameters were calculated using Gibb's equations at 25°C. The surface parameters were also determined including critical micelle concentration, effectiveness, efficiency, maximum surface excess, minimum surface area, interfacial tension, and emulsification power. The synthesized cationic Gemini surfactants were evaluated as bactericides for gram negative and gram positive bacteria and also against sulfur reducing bacteria (SRB). The results of the cytotoxicity of the synthesized compounds against the targeted bacterial strains were promising and completely dependent on the surface activity of these compounds.     

Pairwise decomposition of an MMGBSA energy function for computational protein design

Computational protein design (CPD) aims at predicting new proteins or modifying existing ones. The computational challenge is huge as it requires exploring an enormous sequence and conformation space. The difficulty can be reduced by considering a fixed backbone and a discrete set of sidechain conformations. Another common strategy consists in precalculating a pairwise energy matrix, from which the energy of any sequence/conformation can be quickly obtained. In this work, we examine the pairwise decomposition of protein MMGBSA energy functions from a general theoretical perspective, and an implementation proposed earlier for CPD. It includes a Generalized Born term, whose many‐body character is overcome using an effective dielectric environment, and a Surface Area term, for which we present an improved pairwise decomposition. A detailed evaluation of the error introduced by the decomposition on the different energy components is performed. We show that the error remains reasonable, compared to other uncertainties. © 2014 Wiley Periodicals, Inc.