二阶系统性能参数的研究

系统地总结了二阶系统动力学方程、传递函数、状态方程、时间响应及各种性能指标，并对其进行了详细的讨论，同时揭示了各种方法之间的内在联系及应用中注意的问题。     

甲状腺肿块的高频彩色多普勒超声诊断

目的 :探讨高频彩色多普勒超声检查对甲状腺肿块的诊断价值。方法 :对 48例甲状腺包块患者进行二维及彩色多普勒血流显像超声检查。结果 :48例甲状腺包块患者共检出肿块 67个 ,超声检查与病理对照除 3例误诊外 ,其余 45例与病理结果包括肿块部位、数目均符合 ,符合率 90 % ( 42 / 45 )。结论 :高频彩色多普勒超声检查对甲状腺肿块具有较高的诊断价值 ,可为临床提供有价值的诊断依据     

Orthogonally linear polarized lasers(Ⅰ)--principle and devices

Two kinds of orthogonally polarized lasers, i.e. Zeeman dual-frequency lasers and four-frequency ring lasers (laser gyros) have been developed since the invention of lasers, in which circularly polarized lights oscillate. This paper summarizes recent progress of the study on orthogonally linear polarized lasers with the standing wave cavity. Firstly, the expression of producing orthogonally linear polarized lights in standing wave cavity, i.e. laser frequency splitting, is given. Almost all the birefringence effects made in laser cavity are used to produce orthogonally linear polarized lights. The effect includes quartz crystal birefringence effect, calcite birefringence effect,stress (photo-elastic) birefringence effect and electro-optical birefringence effect. Secondly, several physical phenomena of orthogonally linear polarized lasers are discovered such as aberrance of frequency splitting curves caused by optical activity of quartz crystal, order-passing of longitudinal modes with frequency splitting and strong modes competition. Finally, because the traditional Zeeman dual frequency laser cannot output frequency difference larger than 3 MHz, the approaches of obtaining larger frequency difference are studied. The sequential results, several kinds of orthogonally polarized lasers, are described, such as birefringence dual frequency lasers outputting a frequency difference from 40 MHz to hundreds of megahertz, birefringence-Zeeman dual frequency lasers outputting a frequency difference from 1 MHz to hundreds of megahertz, the LD pumped YAG birefringence dual frequency laser outputting frequency difference of several gigahertz, and the lasers whose longitudinal mode spacing is c/4L instead of c/2L.     

高频等离子体化学气相淀积法制备TiO2超细粒子

利用ＴｉＣｌ４＋Ｏ２体系，在高频等离子体化学气相淀积反应器中合成了纯度高、粒度细的ＴｉＯ２粒子。考察了工艺条件对ＴｉＯ２粒子物性的影响；探讨了ＴｉＯ２粒子晶型控制的方法，金红石型质量分数可通过工艺条件控制；探讨了ＴｉＯ２粒子晶型控制的方法。金红石型质量分数可通过工艺条件控制，减少ＴｉＯ２单体浓度可提高金红石型质量分数；也可通过在原料ＴｉＣｌ４中添加ＡｌＣｌ３等晶型转化剂，使可转化为单一金红石型Ｔｉ     

一种短波电台频率合成器的研制

该文介绍一种采用Ｍｏｔｏｒｏｌａ公司ＭＣ１４５１４６和ＭＣ１２０１７／１８蕊片构成的短波电台频率合成器的硬件电路实现方案。频率合成器的输出频率范围２～２９．９９９９ＭＨｚ，频率间隔１００Ｈｚ，换频时间小于０．０１ｓ。文中论述了这种多环数字式频率合成器工作原理，各环路之间对应的频率关系和电路参数的选择，给出了频率合成器的试验结果．     

碗扣式多功能脚手架CO2气体保护自动焊机

采用CO2气体保护焊工艺研制了碗扣式多功能脚手架CO2气体保护自动焊接设备，在零部件尺寸不规范的条件下，利用电、气动机构实现多个工件的同时准确自动装卡及自动焊接，焊缝成形好，质量稳定，提高了生产效率，节约了能源及4／5的劳动力。     

潜孔锤在准格尔旗苏计沟水源地凿井工程中的应用

结合准格尔旗苏计沟水源地凿井工程的实践,阐述了潜孔锤凿井过程中的技术细节和钻进措施。     

空调水泵变频调节的变压差控制研究

水泵变频的变压差控制就是使压差随着流量的减少而减小,保持管路特性曲线不变,尽量减少系统的无用能耗。实例计算表明,与定压差控制相比,变压差控制需要增加的成本不多,节省的能耗却多了一倍。     

大型矿用挖掘机控制系统的特点及发展方向

比较了发电机—电动机组直流调速系统、可控硅直流调速系统、交流变频调速系统这3种调速系统在矿用挖掘机上的应用情况。     

提升普通高校学报影响力的措施和方法

分析了普通高校学报影响因子低、影响力小的原因,重点论述了提高普通高校学报被引频次、影响因子和影响力的措施和方法.