建立在宽展模型基础上的孔型设计思想

通过对宽展模型结构型式的选择和孔型形状系数的数学分析，建立了根据变形系数寻找几何形状的设计思想。用这种思想探讨了单个孔型和连轧孔型的设计方法。研究表明，常规型钢孔型设计总是在不断的设计—校核中完成的，而新方法避免了这种多次反复的过程。而且新方法更精确、简洁，更有利于设计过程的程序化     

A common aberration with water-immersion objective lenses

We describe here an aberration that is frequently encountered with water‐immersion but not oil‐immersion objectives. The aberration is shown to be induced by tilt of the coverslip out of the plane normal to the optical axis. Model calculations taking into account the path‐length distortions introduced by a tilted coverslip satisfactorily reproduce the observed effect on the images of small subresolution fluorescent beads.     

Determining factor for the blowoff limit of a flame spreading in an opposed turbulent flow, in a narrow solid-fuel duct

This study clarified the blowoff mechanism for a flame spreading in an opposed turbulent flow in narrow solid fuel ducts. To clarify this mechanism, two experiments were conducted. The first experiment was to investigate the influence of ambient pressure and fuel duct size on the blowoff limit. The results indicated that the flow velocity at the point when blowoff occurred, Vg,t, increased with ambient pressure. This tendency could not be confirmed by a well-known expression for the Damköhler number, which is defined as the ratio of the characteristic flow time to the characteristic chemical time. Subsequently, to clarify the determining factor for the blowoff, the second experiment, which observed the flow field near the flame leading edge, was conducted. The results show that the flow separation in front of the flame leading edge, which provided sufficient residence time of oxidizer and gaseous fuel, is necessary for the flame to spread in an opposed oxidizer flow. From the results, it is found that the oxidizer friction velocity, u_∗, which is an indicator of the turbulent momentum transfer, is the determining factor for the flame blowoff limit. When the friction velocity is larger than a critical value, flame blowoff occurs in the fuel duct, due to the absence of flow separation.     

塔里木盆地沙漠区折射波观测方法分析

利用折射波和小折射进行干扰波和表层调查通常采用的是延长炮点的方法来追踪折射层与表层结构，但该方法在塔里木沙漠区的应用存在一些问题，如观测的折射波速度不准确，小折射与微测井测得的表层参数差别大等。从理论和正演模拟着手，并结合实际资料，对复杂地表情况的观测方式进行了分析和探讨，提出了用延长排列的方式进行折射波调查，以及综合小折射与微测井联合观测表层参数。改进后的方法可以有效提高表层调查的精度。     

时延角度扩散信道中TD-SCDMA系统下行波束技术

TD-SCDMA系统最重要技术特征是智能天线技术。本文提出了基于时延和角度扩散及天线结构的时空间信道信道模型。在此基础上研究了下行链路智能天线的波束加权方法。     

波导相位调制器光谱展宽特性分析及实验研究

计算了相位调制器光谱展宽与调制深度的关系，分析并通过实验观察了０．６３２８μｍ光辐射在功率１Ｗ，２．４５ＧＨｚ微波驱动下的频谱，推得调制深度与微波功率的表达式。最后用光栅谱仪测得在１６Ｗ微波功率作用下产生０．１３ｎｍ光谱宽度，两种测试结果吻合较好。     

采用PN匹配滤波器的扩频数据通信系统捕获性能分析

本文针对扩频无线数据通信系统的捕获问题,提出了一种采用PN匹配滤波器实现的方法,大大提高了通信效率。文中对高斯信道和瑞利信道条件下的PN匹配滤波器的捕获性能进行了分析。     

映射序列扩频通信方式及其特性

同时传送多路数据一直是通信的基本课题，本文提出用３个被调制的扩频序列处理成映射序列进行扩频通信，能同时传送３路信息数据，理论分析表明，在不改变常规扩频接收机的情况下，能可靠解出同时传送来的任何一路信息数据，它比８ＰＳＫ、８ＱＡＭ调制方式具有更好的通信特性。     

热带粗轧机组宽度变化规律的实验研究

采用铅作为模拟材料，对热带粗轧机组平辊立轧及随后水平轧制时轧件宽度变化规律进行了实验研究。分析和比较了宽展行为及头、尾部失宽行为与变形工艺参数之间的关系，并得到了相应的数学模型。     

Adaptive equalization of indoor radio channels for 156-Mb/s,QPSK data transmission

Indoor radio communication in the 20–60 GHz band using TDMA with differentially encoded QPSK is consideed. A burst-type transmission, based on a basic time slot consisting of a preamble for synchronization and equalizer training and of an information data section, is adopted. We employ fractionally spaced decision feedback equalization and give the relevant analytical and simulated performance results in terms of Doppler frequency. An upper limit is determined for the channel variations which can be tracked by the equalizer. Performance results are obtained for equalization with and without carrier phase recovery. Calculated and simulated probability of error show that error propagation degrades the performance by about 6 dB at a bit error rate of 10^–3 for a channel without any diversity. However, the effect of past decision errors is negligible for dual diversity. Numerical stability, required accuracy, and hardware complexity are also discussed.