“边沿跟踪法”抗距离欺骗干扰的计算机仿真

介绍了一种脉冲雷达的距离跟踪方案，研究了距离欺骗干扰的原理。分析了抗距离欺骗干扰的各种方法中存在的问题。提出了“边沿跟踪法”抗距离欺骗干扰的方案，用计算机仿真的方法对该方案进行了验证。仿真结果表明，“边沿跟踪法”可以有效地对抗距离欺骗干扰。     

Balance testing and balance-testable design of logic circuits

We propose a low-cost method for testing logic circuits, termed balance testing, which is particularly suited to built-in self testing. Conceptually related to ones counting and syndrome testing, it detects faults by checking the difference between the number of ones and the number of zeros in the test response sequence. A key advantage of balance testing is that the testability of various fault types can be easily analyzed. We present a novel analysis technique which leads to necessary and sufficient conditions for the balance testability of the standard single stuck-line (SSL) faults. This analysis can be easily extended to multiple stuck-line and bridging faults. Balance testing also forms the basis for design for balance testability (DFBT), a systematic DFT technique that achieves full coverage of SSL faults. It places the unit under test in a low-cost framework circuit that guarantees complete balance testability. Unlike most existing DFT techniques, DFBT requires only one additional control input and no redesign of the underlying circuit is necessary. We present experimental results on applying balance testing to the ISCAS 85 benchmark circuits, which show that very high fault coverage is obtained for large circuits even with reduced deterministic test sets. This coverage can always be made 100% either by adding tests or applying DFBT.This research was supported by the National Science Foundation under Grant No. MIP-9200526. Parts of this paper were published in preliminary form in Proc. 23rd Symp. Fault-Tolerant Computing, Toulouse, June 1993, and in Proc. 31st Design Automation Conf, San Diego, June 1994.     

基于DRFM的合成孔径雷达干扰技术研究

本文首先对SAR成像原理进行简要介绍，在分析对SAR干扰的重要性和干扰的难点所在的基础上，提出了利用DRFM对SAR的点目标和分布式目标进行干扰，并在理论推导的基础上进行了仿真实验。仿真结果证明该方法能有效破坏SAR的成像效果。     

Synthesis and self‐assembly of hyperbranched polymers with benzoyl terminal arms

Hyperbranched polyesters (HPs) with a variable content of benzoyl terminal groups were synthesized through the chemical modification of the HPs' cores by substituting a controlled fraction of the terminal hydroxyl groups with benzoyl chloride. The resulting hyperbranched polymers that were modified by benzoyl groups (HPs‐B) were characterized by ¹H NMR, FTIR, differential scanning calorimetry (DSC), and gel permeation chromatography (GPC). Research results revealed that self‐assembled structures could be formed in selected solvents (acetone/n‐hexane). It was found that the morphologies of self‐assembled structures could be adjusted by controlling the content of outside benzoyl terminal groups in the hyperbranched polymers, the volume ratio of acetone with n‐hexane, and the concentration of the hyperbranched polymers with benzoyl terminal arms. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 5554–5561, 2005     

合成孔径雷达噪声干扰技术研究

对合成孔径雷达实施噪声干扰，可以在SAR图像上产生斑点，破坏雷达对目标的检测。首先给出了SAR雷达干扰方程，然后从图像特征检测的角度出发，推导了对其进行有效压制所需的干信比，最后给出了干扰功率的计算实例。     

Mercury diffusion in Hg1−xCdxTe

A radiotracer technique has been used to measure both mercury self-diffusion and surface concentration values in bulk and liquid phase epitaxy, LPE, grown Hg_1−xCd_xTe. A high resolution sectioning technique has allowed profiling of thin epitaxial layers in submicron steps. Hg_1-xCd_xTe samples with composition values betweenx _Cd= 0.16 and 0.23 were isothermally annealed in carefully controlled and monitored diffusion con-ditions. Mercury reservoirs containing Hg²⁰³ were used to provide vapour diffusion sources during closed tube isothermal anneals in the temperature range 300° C to 400° C. Evidence has been found which may indicate the presence of two components in the radio-tracer profiles for both bulk and epitaxially grown material. In some cases it was possible to estimate two diffusion coefficients,D ₁andD ₂, from the near surface and deeply penetrating components, respectively. Our results forD ₁andD ₂are compared with other work. For bulk material annealed at 400° C under a saturated mercury pressureD ₁= 2.0 x 10^-12cm²s^-1 andD ₂= 1.1 x 10^-11cm²s⁻¹. Diffusion coefficients at 310° C under saturated mercury pressure, have been measured in bulk and epitaxial material. Close agreement was found between these results with an average value ofD ₁= 1.4 x 10⁻¹³cm²s⁻¹. We believe this to be the first time radiotracer results for epitaxial material have been presented. We have collated diffusion data, as a function of reciprocal temperature, from several workers and suggest there is evidence for a change in the activation energy for mercury diffusion around 350° C. This may be due to a change in the dominant diffusion mechanism.     

晶格热振动对磁场中半无限极性晶体内表面磁极化子自陷能的影响

采用Huybrechts的线性组合算符法和变分法 ,研究了晶格热振动对磁场中半无限极性晶体内电子与表面光学 (SO)声子强耦合、与体纵光学 (LO)声子弱耦合体系的影响 ,得到了作为距离晶体表面的深度、磁场和温度函数的表面磁极化子的自陷能 .对AgCl晶体进行了数值计算 ,结果表明 ,不同支声子与电子相互作用对表面磁极化子自陷能的贡献以及它们随距离晶体表面的深度、磁场和温度变化的情况大不相同 .     

铜蒸气激光器的改进及稳定

通过改变放电管中铜粒的位置、放电管外层保温材料的性质和厚度以及对放电产生的电磁辐射进行屏蔽等措施,进一步提高了25W铜蒸气激光器的可靠性和稳定性。