喷锚网施工技术在高层建筑深基坑边坡支护中的应用

以南方航空公司新村１～３＃高层建筑的深基坑边坡支护为例，阐述了喷锚网施工技术应用的基本原理，总结了该工程设计、施工及工程质量控制等技术应用方面的一些经验。     

双相活齿泵的工作原理

在活齿传动理论及齿轮泵工作原理相结合的基础上，介绍了双相活齿泵的结构及其工作原理，研究结果表明，双相活齿泵具有流量大、流量均匀性好、噪声低以及可变量等优点。     

离子交换树脂催化合成对枯基苯酚

用D72 强酸型阳离子交换树脂催化苯酚与α -甲基苯乙烯的Friedel-Crafts烷基化反应 ,合成对枯基苯酚。考察了苯酚 /α -甲基苯乙烯摩尔比、催化剂用量、反应温度和反应时间对烷基化反应的影响。优化反应条件 :n(苯酚 ) /n(α -甲基苯乙烯 ) =2 0、催化剂用量 5 % (占α -甲基苯乙烯的质量分数 )、反应温度 85℃、反应时间 5h ,对枯基苯酚的产率为 97 0 %。合成产物结构由红外、核磁光谱所证实。实验结果表明 ,D72 强酸型阳离子交换树脂催化剂稳定性高 ,易于回收 ,且可重复利用 ,催化活性在反应时间内 (或经多次使用 )未见明显下降。     

A concise process technology for 3-D suspended radio frequency micro-inductors on silicon substrate

In this letter, a concise process technology is proposed for the first time to enable the fabrication of good quality three-dimensional (3-D) suspended radio frequency (RF) micro-inductors on bulk silicon, without utilizing the lithography process on sidewall and trench-bottom patterning. Samples were fabricated to demonstrate the applicability of the proposed process technology.     

几种重要的有机氯系阻燃剂

介绍了氯化石蜡、氯化聚乙烯、四氯邻苯二甲酸酐、四氯双酚A、六氯环戊二烯 及由六氯环戊二烯衍生的几种氯系阻燃剂的生产过程和用途。     

Interfacial segregation of Ti in the brazing of diamond grits onto a steel substrate using a Cu-Sn-Ti brazing alloy

Diamond grits were brazed onto a steel substrate using a prealloyed Cu-10Sn-15Ti (wt pct) brazing alloy at 925 °C and 1050 °C. Due to the relatively high concentration of Ti in the brazing alloy, the braze matrix exhibited a composite structure, composed of β-(Cu,Sn), a Cu-based solid solution, and various intermetallic compounds with different morphologies. The reaction of Ti with diamond yielded a continuous TiC layer on the surfaces of the diamond grits. On top of the TiC growth front, an intermetallic compound, composed of Sn and Ti, nucleated and grew into a randomly interwoven fine lacey structure. An interfacial structure developed as the interwoven fine lacey phase was semicoherently bonded to the TiC layer, with the Cu-based braze matrix filling its interstices. The thickness of such a composite layer was increased linearly with the square root of isothermal holding time at 925 °C, complying with the law of a diffusion-controlled process. However, at 1050 °C, the segregation behavior of Ti and Sn to the interfaces between the TiC layer and the braze matrix diminished, due to the increased solubility of Ti in the Cu-based liquid phase. The enhanced dissolution of Ti in the Cu-based liquid phase at 1050 °C also caused the precipitation of rod-like CuTi with an average diameter of about 0.2 μm during cooling. SnTi₃ was the predominant intermetallic compound and existed in three different forms in the braze matrix. It existed as interconnected grains of large size which either floated to the surface of the braze matrix or grew into faceted grains. It also exhibited a nail-like structure with a mean diameter of about 1 μm for the rod section and a lamellar structure arising from a eutectic reaction during cooling.     

A random switching method for HPWM full-bridge inverter

To overcome the problem of unequal switching loss in power switches, in conventional hybrid pulse width modulation (HPWM) full-bridge inverters, a random switching method for HPWM full-bridge inverters is proposed. The proposed method equalizes switching losses of the four switches, while also providing good output performance     

等偏移距自动初至静校正

茅金根 ,梁秀文 ,杨午阳 ,冯有奎 .等偏移距自动初至静校正 .石油地球物理勘探 ,2 0 0 2 ,37(5 ) :4 6 9～ 4 72　　本文提出一种自动计算静校正量的新方法。它首先在等偏移距道集内对相邻道的初至波采用高精度相关构建一个关于炮、检时差的超大矩阵方程 ,然后采用优化统计迭代算法求解炮点和检波点的静校正量 ,并用概率分布函数确定精确的炮、检静校正量 ,最后用误差校正函数消除炮、检静校正误差。实际资料处理结果表明 ,本方法自动、省时、精度高。     

浅谈水利枢纽道路工程建设中的几个问题及其对策

从水利枢纽工程建设的实际出发,分析了枢纽道路建设中的几个值得考虑的基本问题。针对永久性道路的建设环境和建筑特点以及临时性道路的复杂性和多样性,提出了永久性道路和临时性道路建设的基本对策。基于高新技术材料HEC作为道路建筑胶凝材料的实际工程应用,在道路结构布局观念、设计思想、建筑选材和施工工艺及其技术经济性能比等方面提出了枢纽道路工程建设的实施方案,其有效性和可推广性在水布垭道路工程建设中得到了印证。     

电厂设备维修现代化管理系统的建立

在总结传统电厂管理经验的基础上,借鉴国外先进管理经验形成的一套较适合国内电厂设备现代化维修管理系统,在生产实践中发挥了很好的作用。此管理系统将设备的各类任务(日常消缺、定检、大小修)与支持项目(材料、资料)等信息有机地结合起来,使设备信息做到全面、及时、准确,极大地缩短了任务传递时间,提高了任务执行效率,为管理者科学决策提供了有力的依据。