水下长隧道最小安全顶板厚度研究

根据轴线地质剖面和隧道轴线布置图,对某拟建中水下公路隧道最小安全顶板厚度的确定进行了研究,通过比较得出最合理的最小安全顶板厚度,对同类工程有很大的参考价值。     

Coating Effects on Transient Cooling a Hot Spherical Body

A numerical solution is carried out to treat the transient cooling problem with conduction and radiation for a hot spherical body covered with a cold coating material. The solution includes the equations of radiative transfer, coupled with a transient energy equation that contains both radiative and conductive terms. The radiative transfer equation was solved by the discrete ordinates method, and a parmetric study was performed by changing various physical parameters such as the optical thicknesses, thermal conductivity of the coating, emissivity, and diffusivity of the sphere. It was found that the properties of the coating have a direct effect on the cooling rate of the sphere.     

离子束溅射淀积光学薄膜的膜厚均匀性实验

介绍了离子束溅射技术改善薄膜均匀性的两种方法。研究了修正板技术,根据工程需要将修正板技术应用于行星转动条件下的光学薄膜的均匀性修正。分别研究了靶摆动和不摆动的情况下,淀积薄膜的均匀性修正。实验结果表明,修正后的均匀性结果优于 1%,能满足实际应用的要求;靶摆动修正的均匀性结果优于修正板技术。     

Mineralogy of clean coal combustion by-products

Coal combustion technologies are changing in order to burn coal more cleanly. Many “clean combustion“ and postcombustion technologies are developed to remove SO2 and NOx gases, particulate matter during combustion, or from the flue gases leaving the furnace. This paper focuses on three types of fly ash (flue gas desulfurization (FGD) residuals, atmospheric fluidized bed combustion (AFBC) residuals and sorbent duct injection (SDI) residuals) which produced by “the clean combustion“ and postcombustion technologies. The residuals formed by FGD are PCFA (pulverized coal fly ash) grains entrained with reacted and unreacted sorbent and have lower bulk densities than PCFA grains because it contains higher concentrations of calcium and sulfur, and lower concentrations of silicon, aluminum and iron than PCFAs. AFBC residuals consist of spent bed which is a heterogeneous mixture of coarse-grained bed material and irregularly shaped, unfused, spherical PCFAs. The main crystalline phases in AFBC residuals are anhydrite (reacted sorbent), quartz and lime (unreacted sobent), calcite, hematite, periclase, magnetite and feldspars.The residuals produced by SDI contained 65%-70% PCFA with the larger sizes material being irregularly shaped, fused or roughedged. The reaction products of sorbent (portlandite and lime) included calcium sulfate (anhydrite) and calcium sulfate. The chemical properties of these residuals are similar to those of high calcium PCFAs because of the high alkalinity and high pH of these residuals.     

光谱分析的微机测试

介绍了一种用光电倍增管将光信号转换为电信号,再将此信号放大经模数转换后输入到微机、打印机等设备的一套光谱分析的微机处理方法,此种方法与传统的干板照像法进行比较,在进行光谱分析时省时、省力、误差小,实现了光谱分析的微机化。     

基于溶剂热反应快速沉积ZrO_2-基激光光学薄膜

基于丙醇锆-乙酸-乙醇混合体系的溶剂热反应（423 K,10 h）合成了稳定的ZrO2-基溶胶,采用旋转镀膜技术在K9玻璃基片上制备了ZrO2-基光学薄膜。借助动态光散射、傅里叶变换红外光谱、原子力显微镜、紫外/可见/近红外透射光谱、FilmTMTek 3000型薄膜分析仪以及强激光辐照实验对溶胶与薄膜的微观结构及光学性能进行表征。研究发现,通过与溶剂乙醇的酯化反应和与丙醇锆的配合反应,乙酸具有温和地提供反应水和降低丙醇锆水解活性的双重作用。在各工艺参数适当配置的情况下,采用该方法可以快速合成颗粒流体力学直径为10 nm~15 nm的溶胶,由此沉积的薄膜具有平整的表面、较高的折射率1.633（测试波长为632 nm）和高的激光损伤阈值34.7 J/cm2（激光波长为1 064 nm,脉冲宽度为3 ns,＂R/1＂测试模式）。     

光纤电磁场传感器中调制与解调电路的设计及实现

文［１］提出光纤电磁场传感器中的光调制与电解调技术。本文针对光纤电磁场传感器中的一些特殊问题，着重讨论光调制与电解调电路的设计原理。并将实现的电路应用于单光路检测的光纤电磁场传感器中，实验测试取得满意的结果。     

EPON技术在智能变电站状态监测和视频监控系统中的应用

以太无源光网络（ethernet passive optical network,EPON）是一种新型的光纤接入网络技术,它具有低成本、高带宽、电磁干扰小、扩展性强、兼容性强等特点。在智能变电站中状态监测和视频监控系统数据量较大、实时性要求较低。采用EPON技术构建站内状态监测与视频监控系统,能够有效地解决出口带宽分配问题,且无需使用交换机,大大节省网络建设投资与全寿命周期维护成本,是智能变电站状态监测和视频监控系统有效的新型组网方案。分析了智能变电站状态监测和视频监控系统应用EPON技术的可行性,并提出220kV智能变电站EPON网络构建方案,为智能变电站状态监测和视频监控系统的数据传输提供了一种新型方案。     

不等边不等厚Z字钢在蝶式孔型中厚度尺寸的变化规律

本文针对蝶式孔型的结构特点,计算分析了不等边不等厚Z字钢在蝶式孔型中边部厚度变化的规律,为生产实践提供参考。