幽默文体下的欺骗主题——马克·吐温的《苦行记》解读

美国作家马克·吐温习惯于以幽默文体折射当时的社会现实,目的是让人们通过幽默更充分地了解当时的现实世界。他的代表作《苦行记》是19世纪淘金热时期美国西部奇迹般繁荣的写照,它运用轻松的西部黑色幽默,反映了现实社会中值得人们关注和深思的尔虞我诈现象,表现了欺骗这一严肃主题。     

电子干扰下雷达压制区计算

针对电子干扰下雷达发现概率和压制区边界计算问题,推导了有源干扰和无源干扰下雷达发现概率计算公式、干扰压制区和暴露区边界计算公式,建立了干扰模型,仿真了单干扰机和多干扰机对雷达的干扰压制区和暴露区,通过仿真得到目标位于压制区时雷达发现概率极低的结论。     

GPS转发欺骗式干扰时延分析

在GPS转发欺骗式干扰中,转发时延是一项关键技术,当转发时延不合理时,会使接收机钟差改变,容易被识别,降低欺骗干扰的成功率。利用GPS伪距定位原理,推导了转发时延的算法,并针对不同的计算结果分析其对接收机钟差的影响。得出的结论为:当被转发卫星到转发器的距离与转发器到真实点距离之和不大于被转发卫星到虚拟点的距离时,干扰不会对接收机钟差产生影响，否则会影响接收机的钟差。从这个角度出发,对GPS转发欺骗式干扰源的部署位置做了分析，当转发器位于被转发卫星和真实点的连线上,可以使不对接收机钟差产生影响的虚拟点的选择范围最大。     

基于时变白化滤波器的DSSS系统干扰盲检测

将循环维纳滤波应用于直接序列扩频(direct sequence spread spectrum,DSSS)系统的干扰检测,并提出了一种干扰盲检测器,称之为时变白化滤波检测器.由于DSSS信号和干扰信号具有不同的循环平稳特征,因此可以调整时变白化滤波检测器的滤波器系数,使干扰检测器的输出只包含背景噪声和干扰信号,从而实...     

Two heads are better than one: false head allows Calycopis cecrops (Lycaenidae) to escape predation by a Jumping Spider,Phidippus pulcherrimus (Salticidae)

The deflection of attack from vital organs to the wing margin is regarded as an important adaptation in hairstreak butterflies. However, this “lose-little-to-save-much” strategy akin to the detachable lizard's tail had never been tested experimentally. The present study tests the “false head” hypothesis by exposing a hairstreak butterfly, Calycopis cecrops, as well as many other Lepidoptera species as controls, to the attacks of the jumping spider, Phidippus pulcherrimus. The results unambiguously indicate that the “false head” is a very efficient strategy in deflecting attacks from the vital centres of the hairstreak butterfly whereas other similar-sized Lepidoptera fall easy prey. Predator fatigue resulting from unsuccessful attacks was also observed, suggesting that jumping spiders can learn to avoid attacking prey they cannot capture, which would increase the efficiency of the “false head” as a defensive mechanism.     

干扰目标双站测向定位模型

针对干扰目标的空间定位问题,推导出一种双站测向定位的数学模型。提出了测向定位的插值同步计算问题,对水平等速直线飞行目标的航迹进行研究,分析了目标高低角和方位角的变化规律,采用一种有效的有理插值——倒一次插值,作为测向插值同步计算函数,使两雷达站送来的数据在时间上具有同一性,提高了定位精度,具有一定的工程应用价值。     

Weaving, Bending, Patching, Mending the Fabric of Reality: A Cognitive Science Perspective on Worldview Inconsistency

In order to become aware of inconsistencies, one must first construe of the world in a way that reflects its consistencies. This paper begins with a tentative model for how a set of discrete memories transforms into an interconnected worldview, wherein relationships between memories are forged by way of abstractions. Inconsistencies prompt the invention of new abstractions. In regions of the conceptual network where inconsistencies abound, a cognitive analog of simulated annealing is in order; there is a willingness to question previous assumptions - to ‘loosen’ conceptual relationships - so as to let new concepts percolate through the worldview and exert the needed revolutionary effect. In so doing there is a risk of assimilating dangerous concepts. Repression arrests the process by which dangerous thoughts infiltrate the conceptual network, and deception blocks thoughts that have already been assimilated. These forms of self-initiated worldview inconsistency may evoke feelings of fragmentation at the level of the individual or the society. This revised version was published online in July 2006 with corrections to the Cover Date.     

对骗购外汇罪的若干探讨

根据最近颁布的《全国人大常委会关于惩治骗购外汇、逃汇和非法买卖外汇犯罪的决定》 ,就新立罪名即骗购外汇罪的立法根据、构成特征和定罪处罚等问题给予了探讨     

PLC控制系统抗干扰技术的应用

分析了可编程控制器系统中各种常见的干扰因素及特点,对PLC抗干扰技术进行了详细论述,并总结了提高系统可靠性的技术路线及抑制和消除干扰的常用方法。     

钻孔钻进中吸附卡钻事故的原因及处理方法

分析了钻孔钻进过程中造成吸附卡钻事故的原因及其主要特征，提出了一些实用的吸附卡钻事故的预防及处理办法。