Scattering and absorption by thin metal wires in rectangularwaveguide-FDTD simulation and physical experiments

The high-frequency internal impedance model of a round ohmic conductor is incorporated into the subcell thin-wire formulation of the finite-difference time-domain method to model the microwave properties of metal wires. For magnetic metals, such as steel, an effective conductivity is introduced to account for the increase in ohmic loss due to the high-frequency permeability. Physical experiments with half-wave resonant copper- and steel-wire inclusions, supported by a dielectric slab in a standard S-band rectangular waveguide, support the formulation     

CAD/CAE在塑件成型中的模拟分析与优化研究进展

综述了计算机辅助设计(CAD)/计算机辅助工程(CAE)技术在普通塑料制品制造、汽车轻量化以及航天航空等领域的应用。首先建立产品三维模型并进行塑件分析,初步设计出模具的结构,通过优化得到概念化的模具结构;然后进行注塑模具的详细设计,包括型芯型腔的设计、成型零部件的设计,以及对浇注系统、冷却系统、侧向抽芯、顶出机构的设计,通过充填分析、流动分析、冷却分析、翘曲分析使模具设计趋于完善。使用CAD/CAE仿真技术可以保证塑件模具结构设计的可靠性和高效性,降低了生产成本,提高了产品设计质量。     

塔式起重机金属结构计算机辅助设计软件系统

本文就塔式起重机金属结构计算机辅助设计软件系统QT-SCAD的主要结构与功能、理论基础与主要特点作了介绍.该系统适合于上回转水平臂,单吊点、双吊点,行走式、附着式多种结构形式的塔式起重机金属结构的强度、刚度和稳定性分析,机构、金属结构的振动和动力计算,以及整机或任一结构总成的优化设计.     

Tailoring FEKO for microwave problems

In this article we have presented some of the more recent modeling options available in FEKO (waveguide ports, combination with FEM, dielectric GO, PBCs, coupling with networks) that are specifically useful to the microwave engineer. In addition to presenting some of the theory, we focused on examples to show the application of each method and discussed their advantages. The examples were kept intentionally simple such that the relevant advantages can easily be highlighted.     

Cell-surface display of a Pseudomonas aeruginosa strain K pilin peptide within the paracrystalline S-layer of Caulobacter crescentus

The paracrystalline surface (S)-layer of Caulobacter crescentus is composed of a single secreted protein (RsaA) that interlocks in a hexagonal pattern to completely envelop the bacterium. Using a genetic approach, we inserted a 12 amino acid peptide from Pseudomonas aeruginosa strain K pilin at numerous semirandom positions in RsaA. We then used an immunological screen to identify those sites that presented the inserted pilin peptide on the C. crescentus cell surface as a part of the S-layer. Eleven such sites (widely separated in the primary sequence) were identified, demonstrating for the first time that S-layers can be readily exploited as carrier proteins to display 'epitope-size' heterologous peptides on bacterial cell surfaces. Whereas intact RsaA molecules carrying a pilin peptide could always be found on the surface of C. crescentus regardless of the particular insertion site, introduction of the pilin peptide at 9 of the 11 sites resulted in some proteolytic cleavage of RsaA. Two types of proteolytic phenomena were observed. The first was characterized by a single cleavage within the pilin peptide insert with both fragments of the S-layer protein remaining anchored to the outer membrane. The other proteolytic phenomenon was characterized by cleavage of the S-layer protein at a point distant from the site of the pilin peptide insertion. This cleavage always occurred at the same location in RsaA regardless of the particular insertion site, yielding a surface-anchored 26 kDa proteolytic fragment bearing the RsaA N-terminus; the C-terminal cleavage product carrying the pilin peptide was released into the growth medium. When the results of this work were combined with the results of a previous study, the RsaA primary sequence could be divided into three regions with respect to the location of a peptide insertion and its effect on S-layer biogenesis: (i) insertions in the extreme N-terminus of RsaA either produce no apparent effect on S-layer biogenesis or disrupt surface-anchoring of the protein; (ii) insertions in the extreme C-terminus either produce no apparent effect on S-layer biogenesis or disrupt protein secretion; and (iii) insertions more centrally located in the protein either have no apparent effect on S-layer biogenesis or result in proteolytic cleavage of RsaA. These data are discussed in relation to our previous assignment of the RsaA N- and C-terminus as regions that are important for surface anchoring and secretion respectively.     

弧形凸边钢锭一次成材轧制工艺研究

本文根据弧形凸边钢锭的特征,结合舞钢生产实践,详细论述了锭—材的板形、切边余量和成材率的现状,分析了影响原因,从修正轧制工艺参数入手,达到提高成材率的目的。     

平面铰链连杆机构惯性力矩的质量、加速度参数方程及模块“装配”平衡计算法

本文对铰接多杆机构惯性力矩的平衡提出了一种具有一般意义的新方法。本方法建立机构惯性力矩表达式容易、概念清晰、求解方便、模块性强,且易于计算机程序化。     

复杂山区水平绳索取心定向钻进聚合醇绿色防塌冲洗液研究

在西部艰险山区相关隧道及地下工程的勘察施工中,与传统垂直孔相比,水平定向绳索取心钻进勘察效率更高。在地质条件复杂、生态环境脆弱区,钻进过程中易出现塌孔、漏失等问题,要求所用冲洗液在保证流变性能的同时需具备抑制性强、无毒无害、绿色环保等特点。针对绳索取心水平定向钻进冲洗液性能问题,选择环保易降解、抑制性强的聚合物多元醇为主要研究对象,选择环保纤维素及纳米SiO₂,以提升其自身流变性能。所研制的聚合醇防塌冲洗液体系：2%PVA+0.5‰甲基纤维素MC-9+0.5‰纤维素羟烷基醚LE-5+0.1%SiO₂+0.3‰淀粉类降滤失剂DD-1+0.2%有机硅消泡剂DS-957+0.8%KCl,由环保型材料构成,流变性能良好,防塌抑制能力也可达到定向取心钻进工程要求,为解决水平绳索取心定向钻进中的冲洗液工艺技术难题提供了新思路,对类似工程具有借鉴意义与参考价值。     

打印机多功能图形打印的方法与实现

本文提出了如何在软件编制中与打印机通讯,实现多功能图形打印,并编制出图形打印驱动程序。程序留有接口,可方便的被其它高级语言调用。笔者应用本文成果在Epson,CP132,DL3400等打印机上运行,效果极佳。不仅方便地实现了图形变倍、旋转、裁剪、拼装和定位打印,而且图形线条优美,打印速度满意。