微合金钢模拟焊接热影响区组织和韧性研究

采用焊接模拟试验方法，研究了不同峰值温度（Tmax）和不同冷却时间（t8/5），对合Ti-N、TI-NB-N两种微合金钢热影响（HAZ）显微组织、奥氏体晶粒度、冲击韧性影响。试验结果表明：Ti-N钢焊接热影响区比Ti-Nb-n钢具有更高的冲击韧性、更适用于大线能量的焊接条件。     

Hydrolysis of Milk Fat with Lipase in Reversed Micelles

Enzymatic hydrolysis of milk fat was studied in a reversed-micelle system consisting of lecithin, water (1% total volume) and butteroil. Candida cylindracea lipase entrapped in the water pools of reversed micelles hydrolyzed surrounding triglycerides. The optimum temperature for enzyme activity was 55°C with an activation energy of 15.4 kcal/mole, while maximum enzyme activity was observed between pH 4 to 6. The molar ratio of water to surfactant (R value) in the system influenced enzyme activity with maximum activity at R = 10. Enzyme activity also increased with increasing surfactant or enzyme concentration.     

宁夏引黄灌区渠道防渗衬砌技术研究

对宁夏引黄灌区渠道防渗衬砌的形式、防渗衬砌效果、渠道防渗衬砌工程的技术指标、冻害特征、防治措施进行了综合应用分析与研究,提出了不同级别渠道适宜的衬砌形式、推广渠道防渗衬砌的技术要求,供灌区节水工程改造、渠道衬砌工程参考。     

数字通信系统设计中FPGA的仿真

在大规模的FPGA设计中，由于逻辑过于复杂，给仿真与调试工作带来很大难度。本文结合“实用化综合接入系统”边缘路由器子系统的设计，结合仿真软件提供的接口，提出用测试程序自动生成测试向量，自动完成仿真结果检查的方法，大大降低了仿真与调试的工作量。     

MOISTURE TRANSFER PROPERTIES of WILD RICE

Working isotherms for processed wild rice and desorption isotherms for unprocessed wild rice were determined at temperatures ranging from 10 to 43.5°C. the constants for the Guggenheim-Anderson-DeBoer (GAB), Day and Nelson, Chen and Clayton and modified Halsey equations were determined by using a nonlinear optimization technique. the GAB equation showed extremely good fit to the experimental data (less than 5% error). the diffusion coefficients for moisture transport in both broken and whole processed wild rice and for unprocessed wild rice samples were determined at room temperature. the processed broken wild rice kernels had an effective diffusion coefficient of 2.66 × 10^?9 m²/h, whereas the effective diffusion coefficient was 7.08 × 10^?10m²/h for the processed whole wild rice kernels. Unprocessed wild rice had moderate effective diffusivity (1.4 × 10^?9 m²/h). These results predicted quite well the equilibrium water activities and time to equilibrium of wild rice-white rice mixtures using both analytical methods and the finite element method. the transfer of moisture to or from packaged wild rice was also illustrated for different distribution systems.     

虚拟仪器技术在直升机主减速器平台检测中的应用

虚拟仪器技术是基于计算机技术和硬件系统的支持,应用数字化和软件技术进行检测,可以极大地提高测量的灵活性和可扩展性.基于虚拟仪器技术的直升机主减速器的检测可实时掌握装备的动态变化,了解装备的技术状况,具有便捷和低成本等优点.     

蒸汽喷射器射流场流动模型研究综述

综述了3种不同维数的喷射器射流场流动模型的研究工作,分析了3种模型各自的特点后指出,一维模型的建立主要基于定压混合理论或定常面积混合理论;二维偏微分方程模型建立后基于差分法等数值算法进行求解.随着网格技术和计算方法的提高,三维粘性射流场中激波和湍流的数值模拟发展迅速.     

以硅氧烷醇锂为催化剂的氟硅生胶的合成

介绍了单体三氟丙基甲基环三硅氧烷通过硅氧烷醇锂催化剂聚合成氟硅生胶,讨论了不同催化剂及其用量,原料中水分含量、不同乙烯基含量对氟硅生胶分子量的影响.     

高精度智能转速测量模板的设计

介绍了一种利用高性能的16位单片机80C196KC进行转速实时高精度的测量方法，阐述了如何通过CAN总线实现与微机通讯；详细描述了硬件电路的设计，并给出了软件程序框图。     

基于单片机技术的机械设备计时器的研制

介绍一种基于单片机和振动传感器技术，采用软、硬件结合设计的新型数字式机械设备计时器，分析了原理、硬件结构、技术方法、配套设备和软件功能。