广西桂林市雉山桥工程设计及其主要施工特点

城市桥梁交通最大，为使城市桥梁扩建，重建工程中不断交通又不搭设便桥，桂林市雉山桥采用了三段分离式分阶段施工的方法，本文着重介绍雉山桥重建工程为满足分离分阶段施工的桥梁总体布置方案，以及为满足桥梁加宽而采用的桥台加宽的施工方法及新老桥台之间联结措施，还介绍了为减轻桥梁上部结构重量而选有物轻型上部结构类型以及该结构类型的施工方法。     

结构随机风振响应分析的复模态法

对单自由度结构的随机风振响应问题进行了研究。首先建立运动方程，并用线性滤波过程生成脉动风谱，用复模态理论和扩阶法进行解耦，获得了等效风谱对应的结构风振响应的解析解，从而建立了结构风振响应分析的复模态法，该方法可用于带TMD和TLD结构的风振分析和优化设计。     

砌体结构基础隔震随机地震响应分析的复模态法

运用随机振动的时域复模态分析方法，对砌体结构房屋基础隔震体系在平稳随机地震激励情形下的响应进行了分析，得出隔震结构体系的地震反应统计特征。     

Effects of ceramic-based CrN,TiN, and AlCrN interlayers on wear and friction behaviors of AlTiSiN+TiSiN PVD coatings

In this study, the wear and friction behavior of cathodic arc physical vapor deposited AlTiSiN+TiSiN coatings on H13 tool steels were investigated by using CrN, TiN and AlCrN interlayers with tribometer tests both under unlubricated and boundary lubricated conditions. 6 mm alumina balls were used as counter surfaces to test ceramic hard coatings. Surface coatings were characterized through nanoindentation, scanning electron microscopy coupled with an energy-dispersive X-ray spectrometer (SEM/EDXS), optical profilometry, and atomic force microscopy (AFM) techniques. The results showed that especially AlTiSiN+TiSiN coating with TiN interlayer resulted in a much more enhanced tribological performance of the tool steels at both unlubricated and the boundary lubricated conditions even at elevated contact pressures.     

随机创作：消费时代的草根影客文化

一部随身携带的拍照手机或卡片相机，再加上一点点天马行空的想法，属于草根阶层的影像文化便在无声无息中壮大了起来其实草根影客中没有几个来自于社会下层，他们手里的装备虽然算不上专业，但绝对扯不上简陋他们创造出来的影像在视觉识别特性上与“摄影家”有着明显的不同，可以是咬一口的苹果，也可以是回家路上偶遇的流浪猫。平凡人，关注平凡的事情，随机产生的想法加上随手拿起的影像工具，记录随机的生活。随机的创作．这就是属于我们的草根影客文化。     

Improvement of InGaN/GaN laser diodes by using a Si-doped In/sub 0.23/Ga/sub 0.77/N/GaN short-period superlattice tunneling contact layer

InGaN/GaN multiple-quantum-well laser diode (LD) structures, including an Si-doped n/sup +/-In/sub 0.23/Ga/sub 0.77/N/GaN short-period superlattice (SPS) tunneling contact layer, are grown on c-face sapphire substrates by metalorganic vapor-phase epitaxy. The In/sub 0.23/Ga/sub 0.77/N/GaN(n/sup +/)-GaN(p) tunneling junction, which uses a low-resistivity n/sup +/-In/sub 0.23/Ga/sub 0.77/N/GaN SPS instead of a high-resistivity p-type GaN as a top contact layer, allows the reverse-biased tunnel junction to form a "quasi-ohmic" contact. Experimental results indicate that LDs with n/sup +/-In/sub 0.23/Ga/sub 0.77/N/GaN SPS contacting layers can achieve a lower threshold current and longer lasing duration under pulsed operation. Moreover, when the input pulse width is lengthened from 300 ns to 2 /spl mu/s, the lasing duration of the LD with Pt ohmic contact is three times longer than that of the LD with Ni/Au ohmic contacts. Therefore, we conclude that nitride-based LDs with an SPS reversed-tunneling contact layer may significantly reduce the contact resistance of an anode electrode and thereby increase the thermal stability of the device reliability.     

GaN-Based LEDs With AZO:Y Upper Contact

We report the fabrication of GaN-based light-emitting diodes (LEDs) with ytterbium-doped alumina-zinc-oxide (AZO:Y) upper contact. It was found that AZO and AZO:Y are both highly transparent in the visible region with good thermal stability optically. However, it was found that AZO:Y is much more thermally stable electrically, as compared with AZO. Furthermore, it was found that the output power of GaN LEDs with AZO upper contact decreased significantly from 2.80 to 2.30 mW after 700°C annealing. With the same annealing condition, it was found that output power decreased only slightly from 2.77 to 2.69 mW for the LEDs with AZO:Y upper contact.     

角钢孔型的优化设计

本文通过分析角钢的变形规律，结合生产实际经验，提出了角钢孔型的优化设计方法。重点探讨了优化方法的实现和主要数学模型的确定。在上述分析的基础上建立了计算机辅助角钢孔型优化设计系统。     

圆形有压隧洞钢筋混凝土衬砌预留人工缝的防渗漏设计方法研究

通过理论阐述和有限元计算分析，研究了有压圆形隧洞钢筋混凝土衬砌一种新的防渗漏设计方法，即预留人工缝的防渗漏设计法，并根据分析结果提出了设计建议。这种新的设计方法不但能够达到工程中防渗漏设计要求，同时能够节约钢筋和混凝土的用量、施工方便、缩短工期     

一种基于图论和矩阵模型的网格服务依赖分析方法

为了解决网格服务挖掘（GSM）中出现的网格服务测试、维护、组合和失效检测等问题,提出了一种基于图论和矩阵模型的网格服务依赖分析方法.首先分析了GSM中可能存在的各种网格服务依赖的类型.然后定义了直接依赖图、直接依赖矩阵、直接依赖度、依赖关系矩阵和最小覆盖等概念.根据这些定义,给出了使用该方法分析和建模网格服务依赖的过程.最后描述了该方法在四川省交通厅多媒体增值应用系统中的应用过程.结果表明,该方法是准确而有效的.