导柱有限元分析计算

应用UG软件 ,对某装置中的承力零件 -导柱 ,用有限元法对其进行了应力分析计算 ,通过分析计算较全面掌握了导柱的薄弱受力环节 ,给出了导柱的应力、应变图。     

光缆拉伸应变分布测量的新方法：布里渊光纤时域分析技术

通信光缆拉伸应变分布测量对于保证光纤通信线路的长期可靠性具有十分重要的意义。文章论述了布里渊光纤时域分析技术的背景、现状、描述了该技术的基本原理，存在的问题以及目前研究的最新进展。     

利用微波测量烟丝湿度的实验研究

本文介绍用微波（λ＝１０ｃｍ）的方法测量烟丝湿度的实验情况，主要包括透射衰减Ａ和透射相移Φ与烟丝的湿度ＭＣ和密度的关系，以及Φ／Ａ与烟丝密度的关系。实验结果显示了Ａ－ＭＣ、Φ－ＭＣ之间的线性关系，并初步实现了烟丝湿度的单参数测量。同时实验指出了Ａ、Φ随烟丝密度变化的规律及“与密度无关法”应用的必要性和可行性。     

生物转化法生产L－苹果酸的研究（Ⅰ）──富马酸酶产生菌株的筛选

经对３０余份采自不同地区土样的菌种筛选，得到２０株可将富马酸转化为Ｌ－苹果酸的菌株，其中尤以Ｇ（０４）株的转化活力最高。对该菌株的较佳转化条件研究表明：较适的转化温度为３７℃，基质初始ｐＨ值为７．５。菌体经０．２％胆酸３８℃处理２０ｈ，可使富马酸转化率较未处理的对照提高７４．３％。另外，采用０．２％胆酸或０．０６％ＴＰＣ处理菌体，均可在转化反应中抑制琥珀酸副产物的形成。     

Strain evolution of SiGe-on-insulator fabricated by germanium condensation method with over-oxidation

Strain evolutions of SiGe film during Ge condensation processes of SiGe on silicon-on-insulator were studied in detail with assistance of X-ray diffraction. At the beginning of Ge condensation, SiGe on silicon-on-insulator with low Ge fraction was oxidized at higher temperature of 1150 °C, the strong plastic deformation of buried SiO₂ and Si-Ge intermixing relieved most of the strain in SiGe with increasing Ge fraction. When temperature was reduced to 900 °C for oxidation of SiGe layer with higher Ge fraction, Ge accumulation overmatched Si-Ge inter-diffusion, resulting in non-uniform profile of Ge in SiGe layer. During this period, plastic deformation of buried SiO₂ can be neglected and dislocation gliding plays a significant role in relieving strain in SiGe, which enlarges the surface roughness. The strain in SiGe increases gradually with condensation time for the thickness of SiGe layer reduces close to its critical thickness, even with higher Ge fraction. Intensive over-oxidation of germanium-on-insulator materials was suggested to be effective to fully relax the compressive strain but should be precisely controlled to avoid surface deterioration.     

指挥控制系统的信息安全要素

指挥控制系统的信息安全包括保密通信、信息认证、入侵检测和病毒防范.系统易受攻击的环节是局域网与通信链路,需采取链路加密和端到端加密措施.报文信息的鉴别认证可采用差错控制码、报文鉴别码与数字签名进行.采用反常检测统计和基于规则的检测技术进行入侵检测.病毒防范可采用反病毒软件、防火墙、类属解密和数字免疫系统等新型反病毒措施.     

计算机病毒武器浅析

计算机病毒武器借助通信线路扩散计算机病毒,也可预先把病毒植入相应智能机构,再按给定信号或预定时间使其发作,破坏计算机资源、使计算机网络系统出现故障.计算机病毒按传染、连接、破坏性、程序运行平台等分为不同类型,对目标计算机攻击主要通过耦合方式侵入,包括无线电、"固化"、后门攻击及数据控制链等方式.     

Nacre in Mollusk Shells as a Multilayered Structure with Strain Gradient

How do living organisms attain the complicated shapes of grown bio‐composites? This question is answered when studying the mechanics of the nacre layer in the bivalve mollusk shells. In this study, the internal strains/stresses across the shell thickness are profiled as a function of depth by strain gauge measurements during controlled etching in the selected areas. Measurements of stress release under etching provide clear evidence that the investigated shells, in fact, are strained multilayered structures, which are elastically bent due to the forces evolving at the organic/inorganic interfaces. The stresses are mostly concentrated in the “fresh” nacre sub‐layers near the inner surface of the shell adjacent to the mollusk mantle. This analysis unexpectedly shows that the elastic bending of the nacre layer is due to strain gradients which are originated in the gradual in‐depth changes of the thickness of ceramic lamellae. The changes mentioned were directly observed by scanning electron microscopy. By this sophisticated design of the ultra‐structure of the nacre layer, the bowed shape of the bivalve shells is apparently achieved.     

Prediction of the pipe buckling by using broadening factor with distributed Brillouin fiber sensors

We successfully measured longitudinal strains in two full-scale steel pipe specimens subjected to loading combinations of internal pressure, axial tensile force and bending moments undergoing local buckling under controlled laboratory conditions. Carbon-coated fibers, for the first time, and standard communication fibers were used. By using the broadening factor of the Brillouin spectrum width, we can successfully predict the location and progression sequence of buckling patterns, prior their visual detection in the laboratory. The broadening factor processing time is more efficient than multiple-peak fitting of the Brillouin spectrum method. Thus, it is capable of proving real-time deformation progression in structural health monitoring applications. High strength carbon-coated fibers are found to be superior to standard communication fibers in two respects: they provide more accurate readings and are able to measure significantly larger strains.     

一种实现企业内部员工高效协同的信息化建设思路

本文以四川省烟草专卖局（公司）效能建设的信息化支撑———效能协同办公平台的建设为背景,围绕企业内部员工之间的沟通与协作、办公效率等所面临的一系列问题进行思考,从企业发展面临问题、信息系统建设现状,未来信息化一体化目标等方面进行综合分析,并结合当前业界主流的信息技术应用方向,提出了一种面向企业内部员工的高效协同的建设思路,期望借以此文为企业通过信息化手段降低员工日常工作复杂度、提高员工工作效率、增强企业自身竞争力提供借鉴。