光时域反射计衰减特性检定装置

介绍一套“有源法”光时域反射计（ＯＴＤＲ）衰减特性检定装置。对参考量值采取自标定的方法，用一种串联替代法实现对高重复性衰减器３．０１０ｄＢ值的准确标定。该装置检定灵活性强，对ＯＴＤＲ衰减特性检定的不确定度优于０．０２ｄＢ／ｄＢ（９５％置信度）。     

Location of the sacral pedicle, foramina, and ala on the lateral aspect of the sacrum: a radiographic study

Twenty-one adult dry-bone sacral specimens were used to quantitatively determine the location of the sacral pedicle, foramina, and ala on the lateral radiographic view of the sacrum. The anterior and posterior sacral foramina from S1 to S3, the midlines of the anterior sacrum and cephalad border of the S1 vertebral body, and the lateral limit of the lateral sacral mass were outlined with wires. A lateral radiograph was taken, and measurements were made directly from the radiograph. The average sacral pedicle height for both male and female specimens was approximately 20 mm for S1, 12 mm for S2, and 7 mm for S3. The sacral foramina height averaged approximately 13 mm for S1 and S2, and 10 mm for S3. The average ala and S1 body-ala angles were 88 degrees and 35 degrees. The distance from the ala tip to the anterior aspect of the sacrum averaged 12 mm, and the average anterior height of the S1 vertebral body above the ala was 11 mm. These measurements, in conjunction with inlet and outlet radiographs, may aid in the recognition of the vital structures of the sacrum on the lateral radiographic view and enhance the safety of dorsal sacral screw placement.     

感光性材料在火箭发动机上的应用

主要介绍感光性材料的制备及其在火箭发动机包覆层中的应用，即用感光性树脂通过紫外光辐射固化，以简化现有的包覆工艺，并提高包覆层的性能。     

XPS对离子交换法光色玻璃中银的状态研究

本文介绍利用ｘ射线光电子能谱分析仪（ＸＰＳ），对玻璃表面银的存在状态进行研究，实验结果表明银以Ａｇ＾０、Ａｇ＾＋、Ａｇ＾＋＋三种状态存在，而Ａｇ＾＋的存在有利于玻璃光色性的提高。文中并提出了在工艺过程中应采用惰性或弱氧化性气氛。     

HPP－1型皮革加脂剂的研制和应用

本文概述了以磷酸化蓖麻油和羟化磷脂为基础的皮革加脂剂的研制，讨论了合成反应、产品配伍、应用试验等工艺过程。     

安全壳钢衬的初始后屈曲分析

基于Ｄｏｎｎｅｌｌ的非线性板壳理论，认为钢衬壳是一种有特殊缺陷形状的钢衬板，用初始后屈曲渐进分析理论，研究了在温度应力作用下缺陷钢衬板即钢衬壳的初始后屈曲性态。计算了一个四点铆固钢衬壳模型，同时给出了铆钉间距等参数对钢衬壳屈曲极值温度的影响。     

离散效应存在时孤子脉冲的增强压缩

在群速度不匹配的条件下，提出一种提高孤子脉冲压缩效应的新方法．研究表明，若使信号脉冲与泵浦脉冲存在一适当的初始延时，则不但可以提高离散效应单独存在时信号脉冲的压缩比，而且可以提高孤子脉冲的压缩质量．     

High concentration erbium doping of silicon-rich SiO2 thin films on silicon

In this work, high concentration erbium doping in silicon-rich SiO₂ thin films is demonstrated. Si plus Er dual-implanted thermal SiO₂ thin films on Si substrates have been fabricated by using a new method, the metal vapor vacuum arc ion source implantation with relatively low ion energy, strong flux and very high dose. X-Ray photoelectron spectroscopy measurement shows that very high Er concentrations on the surfaces of the samples, corresponding to 10 at.% or the doping level of 10²¹ atoms cm⁻³, are achieved. This value is much higher than that obtained by using other fabrication methods such as the high-energy ion implantation and molecular beam epitaxy. Reflective high-energy electron diffraction, atomic force microscopy and cross-section high-resolution transmission electron microscopy observations show that the excess Si atoms in SiO₂ matrix accumulate to form Si clusters and then crystallize gradually into Si nanoparticles embedded in SiO₂ films during dual-ion implantation followed by rapid thermal annealing. Er segregation and precipitates are not formed. Photoluminescence at the wavelength of 1.54 μm exhibits very weak temperature dependence due to the introduction of Si nanocrystals into the SiO₂ matrix. The 1.54-μm light emission signals from annealed samples decrease by less than a factor of 2 when the measuring temperature increases from 77 K to room temperature.     

计算机生成兵力中的人工智能技术

开发CGF的难点和重点在于CGF实体行为的生成,尤其是人类智能行为的实现。人类行为建模最重要的三个方面是知识获取、知识表示和决策机制,都与人工智能技术相关。该文主要介绍人类行为描述的知识表示和知识获取问题,讨论了人工智能技术在这两个方面的应用,并对将来的研究工作做了一个简单的展望。