用于焊缝跟踪的调制式红外光学传感器

叙述了一种以脉冲调制的红外光束为信号光源的焊缝跟踪传感器。通过对接 收信号的滤波及“自适应消噪”处理,可以有效地克服电弧光的干扰;利用光源的脉冲 驱动特性,加大了瞬时信号功率,改善了光学传感器对工件表面的适应性。传感器结构简 单、体积小、灵敏度高、能同时实现对焊缝在水平及高度两个方向的自动跟踪在埋弧 及明弧自动焊中均能准确地跟踪。     

回转体零件形位误差数据处理软件包

在介绍获取采样数据方法的基础上,简要地叙述了所建立的主要形位误差的数学模型．着重论述了形位误差数据处理软件包的设计思想与实现方法．该软件包不但可以求得不存在原理误差的准确的形位误差值,而且可以求得形位误差的方位．该软件包已应用在＂ＸＷＹ－Ｉ＂型形位误差测量仪上．     

新疆兵团国有企业推行现代企业制度探索

市场经济的发展和党中央关于建立现代企业制度的决定为兵团国有企业的发展提出了新的要求,兵团国有企业“一穷二死”的现状也要求兵团国有企业转换经营机制,据此本文分析了兵团国有企业建立现代企业制度面临的问题,并对改革的思路进行了探讨。     

战斗机网络攻击指令引导控制方法

对战斗机网络攻击指令引导控制方法进行了研究。建立了导弹拦射攻击模型和导弹发射边界模型;以航向角和高度为引导指令建立网络指令引导解算模型;基于典型作战场景对上述模型进行仿真实验分析。仿真结果表明:不管针对非机动目标还是机动目标,采用网络攻击指令引导方法都能实现最大火力包线的战斗机网络攻击引导。     

Critical slope gradient for compulsory abandonment of farmland on the hilly Loess Plateau

Scientific evidence for the upper limit of farmland is proposed. Shallow gully erosion is one of erosion types distributed extensively on sloping farmland in the hilly regions of the Loess Plateau. Field observation and aerial photos interpretation, as well as laboratory experiments show that the shallow gully erosion occurring on the steeper farmland in the hilly regions of the Loess Plateau is an important factor leading to intensive erosion on slope, because of its extensive distribution and intensive runoff collection. The data on the formation, development and distribution of shallow gullies on sloping farmland indicate that critical slope gradient for shallow gully initiation ranges from 15 to 20 degrees with an average of 18.2 degrees. Therefore, it is suggested that critical slope gradient for compulsory abandonment of farmland on the hilly Loess Plateau should be kept within the critical slope gradient for shallow gully initiation to prevent shallow gully formation in order to control soil loss more effectively. But as the first step, the cultivation on the slopes with slope larger than 25 degrees where the maximum erosion occurs should be strictly forbidden.     

力学量算符本征函数的正交归一性

文中讨论了力学量算符本征函数的正交归一化性质,给出了得到正交归一化函数的方法。     

脂多糖—被动血凝试验早期诊断伤寒的价值

为评估脂多糖－被动血凝试验（ＬＰＳ－ＰＨＡ）早期诊断伤寒的应用价值,对病程不同的１０２例伤寒患者用ＬＰＳ－ＰＨＡ、肥达反应和细菌培养进行检测,２００例非伤寒发热患者作为对照。结果显示：伤寒患者病程第一周ＬＰＳ－ＰＨＡ阳性率为８０％（２４／３０）,第二周达９７７３％（４３／４４）;细菌培养阳性率２４５１％;肥达反应的伤寒与副伤寒鞭毛抗体交叉阳性率达３７２５％;对照组ＬＰＳ－ＰＨＡ有２％的假阳性。结果表明：ＬＰＳ－ＰＨＡ可早期、简便及快速诊断伤寒,有较高的敏感性和特异性。     

Genomic organization of EDSV strain AA-2

The genomic organization of egg drop syndrome virus strain AA-2 isolated in China is reported here. The genome was found to be 32 838 bp in length, approximately 2 kb shorter than those of the human subgenus C adenoviruses. Analysis of open reading frames indicated that the genes for major viral structural proteins (55 K, Penton base, pⅦ, pⅩ, pⅥ, Hexon, 100 K, pⅧ and Fiber), as well as EP, DNA polymerase and ⅣaⅡ are present in the expected locations in the genome. EDSV possesses no identifiable E3 and E4 regions and most proteins encoded by E3 and E4 regions of other adenoviruses genome were not presented in EDSV.     

Determination of tectonic background for sedimentary basin from sandstone geochemistry

The chemical composition of sedimentary rocks is mainly controlled by source rocks. Through examining chemical composition of terrigenous rocks, the tectonic evolution of a sedimentary basin can be modeled. The Turpan Basin belongs to a continental sedimentary basin and its source rocks are derived from the upper continental crust.