无源毫米波末敏弹

论述了八毫米辐射计的末敏弹的工作原理和设计原则，在搜索过程中末敏弹吊在降伞下，一面旋转一面以某个适当的速度下降，使辐射计的天线以螺旋线形扫描目标区域，在此有效面积内探测目标，并以很高的命中概率摧毁目标，在天线温度对比度理论计算的基础上研制出探测和定位算法，给出了计算机仿真打靶试验的结果。     

机载综合孔径辐射计用于目标探测的性能分析

探讨了机载综合孔径辐射计的技术参数与探测目标的最大探测距离之间的关系,推导了综合孔径辐射计微波辐射图像对比度的计算公式,给出了综合孔径辐射计探测目标最大距离的计算方法,研究了积分时间累积对探测距离的影响.以T型天线阵列为例,对机载综合孔径辐射计探测亮度温度对比度为200 K左右的金属目标的性能进行了分析,计算结果表明:该机载综合孔径辐射计能够以150 m/s的飞行速度探测到距离10 km远处半径为4 m的金属圆目标.     

毫米波被动探测空中隐身目标研究

为探测空中涂层隐身目标,建立了地面辐射计对空中目标进行锥形扫描的天线温度对比度计算模型。在目标下方分别为高发射率地面和低发射率水面的情况下,对晴天时平面隐身目标和光洁金属目标的天线温度对比度进行了对比计算。将3 mm波段辐射计系统固定在地面上,目标分别悬挂于水泥地面和水池上方10 m高度处,分别在晴天和阴天时,采用辐射计系统对隐身目标和光洁金属目标进行了探测实验。计算和实验结果说明,涂层隐身目标比同等大小的光洁金属目标的天线温度对比度大,当目标下方地物的发射率较小时,差别更大。在毫米波被动探测下,空中金属目标表面的吸波材料涂层,不仅不能起到隐身效果,反而会更明显地暴露目标。     

海洋船舶的微波辐射遥感研究

根据微波辐射理论 ,船舶与海洋背景或陆地、岛屿表面的发射率相差很大 ,故使用毫米波辐射计可以探测海面上的船舶。讨论了海洋、天空及陆地等背景微波辐射特性 ,给出了计算船舶目标与海洋背景的天线温度对比度的公式 ,并给出 8mm及 3mm波段下几种背景的辐射温度曲线和不同高度下的海上目标的天线温度对比度的计算和测量数据 ,另外 ,介绍了毫米波辐射计探测海上船舶的实用的试验方法以及其应用前景。     

末敏弹被动特性的干扰技术研究

介绍了末敏弹的攻击过程,并且在详细分析毫米波辐射计被动探测工作模式原理的基础上,设计了欺骗式脉冲压制干扰和欺骗式连续波压制干扰两种干扰样式,并且分别进行了仿真。仿真结果表明,欺骗式的干扰方式会造成末敏弹辐射计在一定程度上的识别率下降,研究结果对工程实践具有指导性。     

弹载毫米波辐射计仿真系统研究

从弹裁毫米波辐射计的目标信号数学模型出发，对目标信号进行了仿真计算。对仿真数据所作的比较、分析表明，计算结果准确可靠。结合工程实际，讨论了不同地物分布时的辐射计仿真结果。     

3 mm波段面目标辐射特性测量研究

论述了3mm波段(94GHz)同步检波Dicke辐射计基于自然变温源的定标方法与特性指标.在水平和垂直两种极化下利用矩形口面的喇叭天线对天空及5种典型的地物目标进行了测量,水泥、沥青、黄土、草地的测量范围为20°～85°,水面为20°～75°,天空为0°～90°;利用带有卡赛格伦天线的3mm和8mm辐射计对沥青背景下的金属板进行了对比测量,3mm和8mm辐射计天线的3dB波束宽度分别为0.5°和1.5°.辐射特性测量证明了两种极化间的差别随着表面粗糙度的增加而减小;卡赛格伦天线对金属板测量中,3mm辐射计比8mm辐射计可测得更高的天线温度对比度.     

低噪声放大器在毫米波辐射计中的应用研究

针对传统全功率辐射计灵敏度低、结构复杂、等效噪声温度高、功耗高等特点,采用低噪声放大器代替传统全功率辐射计的检波前部分,对天线接收到的微弱热辐射信号直接在射频段进行放大后直接检波,提高了辐射计的灵敏度。首先,分析了辐射计的工作原理;然后,分析了辐射计灵敏度及其影响因素;最后,进行了改进后辐射计样机设计并详细计算了灵敏度指标;且对样机性能进行了实际测量。通过对比分析表明,低噪声放大器的引入使得同等条件下毫米波辐射计的灵敏度得到了很大提升;同时具有功耗低、体积小、噪声小、结构简单等优点,有利于毫米波辐射计在弹载武器上的应用。     

低噪声放大器在毫米波辐射计中的应用

针对传统全功率辐射计灵敏度低、结构复杂、等效噪声温度高、功耗高等特点,采用低噪声放大器代替传统全功率辐射计的检波前部分,对天线接收到的微弱热辐射信号直接在射频段进行放大后直接检波,提高了辐射计的灵敏度。首先,分析了辐射计的工作原理;然后,分析了辐射计灵敏度及其影响因素;最后,进行了改进后辐射计样机设计并详细计算了灵敏度指标;且对样机性能进行了实际测量。通过对比分析表明,低噪声放大器的引入使得同等条件下毫米波辐射计的灵敏度得到了很大提升;同时具有功耗低、体积小、噪声小、结构简单等优点,有利于毫米波辐射计在弹载武器上的应用。     

水中近距主动声探测概率的模拟计算

该文对近炸引信采用声探测的过程进行了分析，建立了声探测的数学模型，采用蒙特卡罗法仿真计算了不同条件下深弹对目标的探测概率，以此研究影响声探测概率的因素。计算的结果表明，深弹的下沉速度和计数电路的预置值对探测概率有较大的影响，其他因素影响很小。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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