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.     

Decision trees for forecasting

Recent years have seen an increasing cross-fertilization between the fields of decision analysis and forecasting. Decision-analytic models often require forecasts as inputs, and aspects of the Bayesian decision-theoretic framework underlying decision analysis have proved useful to forecasting, particularly in contexts where subjective judgemental inputs are required. This paper describes the use of decision tree analysis for forecasting and illustrates its use for corporate divisional forecasting and planning. A specialized decision-analytic technique, acts as events, is also described and illustrated to forecast a new product's earnings. Conclusions are drawn about the applicability of decision analysis for forecasting.     

水电工程规划设计方案的自动生成及评价

本文介绍了在水电工程规划设计时，如何利用三次自然样条插值函数在有限个方案的基础上自动生成无限多个方案，然后采用多目标综合决策模型在其中选择最优方案的一种方法．文中还给出了程序流程，并以某水电站正常蓄水位选择作为实例，对方法进行了验证，结果与专家决策完全吻合．     

马尔科夫人才规划模型与应用研究

介绍了马尔科夫人才规划模型，提供了一种可以用来进行组织的内部人力资源供给预测的方法，其基本思想是找出过去人事变动的规律，以此来推测未来的人事变动趋势．这一方法不仅可以处理员工类别单一的组织中人力供给的预测问题，也可以解决员工类别复杂的大型组织中的内部人力供给预测。     

基于长期计划的动态给水管网优化设计模型

鉴于给水管网的优化设计的重要作用，提出了更符合实际、准确度更高的基于长期计划的动态给水管网优化设计模型。其目标函数中，动力费采用与时间相关的函数计算，折旧大修费采用与管段损坏率相关的函数计算，并建立了相应的动态优化设计模型。可以更精确地得出基于长期计划考虑管网优化设计结果。     

中学校园环境景观设计探讨

以某中学校园环境景观设计为例，对景观设计中如何挖掘校园文化内涵，如何体现人与自然高度和谐统一，如何走可持续发展道路，如何通过艺术化、人性化空间的塑造．来创造富有时代气息的中学校园环境作了探讨。     

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．