圆迹合成孔径雷达成像技术综述

圆迹合成孔径雷达(circular synthetic aperture radar, CSAR)由于具有亚波长量级的平面分辨率、三维成像潜力以及全方位观测能力等条带合成孔径雷达不可比拟的优势,在遥感测绘、灾害监测与评估、森林作物资源管理、战场目标侦察等领域具有广阔的应用前景。本文首先给出了CSAR的信号模型,并分析了其成像特点,然后较为全面地分别对国外和国内CSAR系统和试验的研究进展进行了综述,接着通过对CSAR成像算法、运动补偿、三维成像等成像技术现状的详细分析,总结归纳了CSAR成像技术当前仍然存在的问题,最后对CSAR成像技术进行了总结,并对CSAR未来发展进行了展望。     

Fabrication of High Quality SiGe Virtual Substrates by Combining Misfit Strain and Point Defect Techniques

High quality strain-relaxed thin SiGe virtual substrates have been achieved by combining the misfit strain technique and the point defect technique.The point defects were first injected into the coherently strained SiGe layer through the "inserted Si layer" by argon ion implantation.After thermal annealing,an intermediate SiGe layer was grown with a strained Si cap layer.The inserted Si layer in the SiGe film serves as the source of the misfit strain and prevents the threading dislocations from propagating into the next epitaxial layer.A strained-Si/SiGe/inserted-Si/SiGe heterostructure was achieved with a threading dislocation density of 1×104cm-2 and a root mean square surface roughness of 0.87 nm.This combined method can effectively fabricate device-quality SiGe virtual substrates with a low threading dislocation density and a smooth surface.     

基于LabVIEW刀具动态补偿方法

针对刀具补偿在数控加工中的重要作用,着重阐述了常用刀具补偿,并对刀补功能及应用做了进一步论述.同时本文对动态参量的刀具补偿方法进行了研究,设计出基于LabVIEW的计算方法,使数控加工适应性得到增强,提高了机械加工精度.     

Research on frequency-temperature compensated sapphire-SrTiO3 loaded cavity for hydrogen maser

To obtain frequency-temperature compensation in a sapphire loaded cavity for hydrogen maser, a dielectric named SrTiO3 is employed whose temperature coefficient of permittivity is opposite to that of sapphire. Based on theoretical analysis and computer simulation, a TE011 mode of a sapphire loaded cavity associated with two small rings of SrTiO3 with different thickness is solved, and the useful parameters that influence the temperature coefficient of cavity are calculated. Finally an experiment is brought forward and its results are very close to the computing results. When the thickness of SiTiO3 dielectric is 7 mm and the diameter is 17 mm in configuration b, the temperature coefficient of cavity is decreased from −58.8 kHz/K to −8.2 kHz/K and the quality factor is 40248.     

金融侵权行为认定及惩处探讨

金融侵权行为是一种特殊的行业性侵权行为，必须依法认定金融机构的储蓄侵权行为、借贷侵权行为、贷款欺诈行为、证券欺诈行为、票据欺诈行为等。公民、法人因多事侵权行为而遭受损害的，有权依法索赔。金融机构及其工作人员的侵权行为触犯法律规定的，还必须依法追究单位和个人的行政责任或刑事责任。     

灵活运用子程序调用指令和刀具半径补偿指令简化数控编程

在数控铣床的编程中，灵活运用子程序调用和刀具半径补偿指令，尤其是二者联合使用或与其他指令联合使用，不仅可以简化程序，而且能收到类似数控车床固定循环功能的效果，给出了应用技巧实例．     

高速列车司机室前窗框焊接变形

高速列车司机室前窗框由全铝合金空间曲梁焊接而成，焊接变形难以控制.采用固有应变法对某型号高速列车司机室前窗框进行焊接变形仿真分析，与实测数据对比表明：该方法预测高速列车前窗框的焊接变形准确、可行.     

论我国多元化刑事和解方式的构建

司法实践中,刑事和解的方式主要是经济赔偿,这容易给公众造成刑事和解系花钱买刑的印象,并会造成一系列的负面影响。为完善我国刑事和解制度的适用,必须改进现有的单一化刑事和解方式。在适用刑事和解方式时,应当遵循自愿、公平、务实等原则;在保留现有的刑事和解方式的基础上,应构建多元化的刑事和解方式;在多元化的刑事和解方式中,经济赔偿仍应被视为主导方式,赔礼道歉应成为必要方式;为配合多元化刑事和解方式的构建,有必要采取相应的配套措施。     

半导体纳米线——宏观牛顿世界与微观量子世界的理想桥梁

本文以我们的研究团队自1995年以来在半导体纳米线材料与物理研究中所做的科研工作为主线，从如何自下而上地规模、可控制备硅等半导体纳米线的开创性研究工作开始，着重介绍半导体纳米线独一无二的物理性质的代表性研究工作，以及它们在高品质真空电子源、新型高效光电器件、新能源器件方面的潜在应用的研究成果．最后，对半导体纳米线的未来发展前景进行了展望．     

Compensation for time-delayed feedback bang-bang control of quasi-integrable Hamiltonian systems

The stochastic averaging method for quasi-integrable Hamiltonian systems with time-delayed feedback bang-bang control is first introduced.Then,two time delay compensation methods,namely the method of changing control force amplitude (CFA) and the method of changing control delay time (CDT),are proposed.The conditions applicable to each compensation method are discussed.Finally,an example is worked out in detail to illustrate the application and effectiveness of the proposed methods and the two compensation ...