战略靶场复杂电磁环境构建的几点思考

指出了在战略靶场构建复杂电磁环境面临的困难,叙述了构建复杂电磁环境的总体构想,并对复杂电磁环境下的靶场进行了效能评估,提出了发展环境构建的设想与建议。对战略导弹靶场构建复杂电磁环境有一定的借鉴作用。     

基于ZigBee无线传感器网络的温室监测系统设计

为了解决温室环境监测系统中遇到拓扑结构固定、节点延展性差等问题,提出了基于ZigBee无线传感器网络的温室监测系统设计与实现方法,构建了基于ZigBee协议的无线监测网络,给出了网络中节点硬件和软件的设计方案,详细论述了ZigBee协调器的组网过程。该系统利用PIC18F4620单片机控制CC2420无线收发器模块收发数据、驱动温湿度传感器（SHT11）,通过I²C总线方式进行数据采集,将采集的温湿度经ZigBee网络传输到监测平台。测试结果表明,该系统具有结构简单、节点灵活、功耗低等优点,实现了在无线环境下对温室中温湿度的有效监测。     

基于ZigBee技术的环境监测系统设计

基于环境的要求,设计了一种短距离的ZigBee无线传感器网络技术的环境监测系统,从而实现环境监测动态的、全方位的实时监控。文章详尽介绍了该方案中ZigBee技术、系统设计总体思路,并指出ZigBee技术在该方案中的应用实现了高度灵活性、有扩展性、稳定性、抗干扰能力等特点。     

复杂电磁环境认识综述

该文就如何理解复杂电磁环境给出了初浅的认识,并总结了复杂电磁环境的几个特点,同时提出了复杂电磁环境构建的原则和基本方法,将有益于对电磁环境的认识和构建。众所周知,信息革命已席卷全球,21世纪已由机械化时代进入信息化时代。目前,对复杂电磁环境的研究、分析以及如何为训练构设一个逼真的复杂电磁环境,已是一个热点问题。随之而来的是什么是复杂电磁环境,复杂电磁环境有什么特点等问题没有权威的解释。所以,如何理解和认识复杂电磁环境这个问题,还需要一个研究、讨论和趋同的过程。     

S3C2410在ZigBee无线通信中的应用

ZigBee是近年来出现的一种新兴的短距离无线通信技术。在各种无线网络技术中,ZigBee技术具有组网灵活、设备成本低、电池寿命长等优势。文中介绍了ZigBee技术以及一款Samsung公司使用ARM920T处理器内核开发的嵌入式处理器S3C2410的性能,阐述了该系统的硬件和软件平台设计方案,并利用该处理器构建一个嵌入式无线系统,满足目前人们对于低功率、低成本无线通信的要求。     

基于ARM S3C2410的嵌入式ZigBee网关设计

为实现ZigBee无线传感器网络与Internet之间的数据交换,设计实现了一个基于ARM S3C2410处理器的嵌入式ZigBee网关.系统以ARM9处理器芯片S3C2410与ZigBee CC2530芯片为核心,外部扩展多个功能模块组成硬件平台.在移植嵌入式操作系统WinCE6.0的基础上,开发设计了相应应用程序来构建ZigBee嵌入式网关系统.测试结果表明:该网关系统实现了Internet与ZigBee无线传感器网络之间数据的交换;具有成本低、稳定性强、易于推广等特点.     

基于CC2530的ZigBee射频收发模块设计

采用TI公司CC2530芯片,设计了一种基于ZigBee无线通信系统射频模块.提出了ZigBee 通信系统印制天线的小型化结构以及硬件系统框架,与传统ZigBee无线通信射频模块采用外接单板子天线相比具有低剖面、小型化等优势.射频收发模块原理图与PCB版图均采用Cadence软件进行设计.印制天线采用电磁仿真软件HFSS建模,仿真与实测结果均满足ZigBee通信要求.     

基于ZigBee技术的射频识别读写器网络的构建

采用ZigBee技术的树型网络拓扑用构建一个基于ZigBee技术的射频识别（RFID）读写器网络。该网络将RFID读写器以AdHoc的方式连接起来,构建RFID读写器网络,使得读写器能更加高效、快速、准确地获得标签上的信息,有效地提高系统的性能。     

基于NB-IoT和ZigBee的物联网智能建筑环境监控方法

现阶段，物联网技术已经广泛应用到智能建筑行业中，但在环境监控方面依然较为薄弱，智能建筑安全水平仍然不高，提出基于窄带物联网（NB-IoT）和ZigBee的物联网智能建筑环境监控方法。融合NB-IoT和ZigBee无线通信技术生成无线组网，将智能传感器作为数据采集节点，获取智能建筑环境监控数据，并对获取到的数据进行预处理。搭建多层簇网络结构，动态化选取簇头，融合全部环境监控数据并构建智能建筑风险矩阵。通过计算智能建筑风险数值评估建筑风险，从而实现智能建筑环境监控。实验结果表明，应用该方法后环境监控网络能耗更低，环境监控数据融合时间更短，智能建筑风险评估结果更加接近实际评估结果，充分证实了该方法具有较好的智能建筑环境监控效果。     

基于Zigbee无线网络“电子围墙”安全防护系统的实现

本文研究的目的是在幼儿较为集中的场合,为了对幼儿离开安全中心距离进行实时监测,在IAR开发环境下,以CC2530为主控芯片,结合TI业界领先的黄金单元ZigBee协议栈构建ZigBee无线网络"电子围墙"系统,并给出系统的硬件、软件的设计.实现了对移动节点位置状态的实时采集和无线传输,该系统可靠性高,实时性好,能耗较低,能够较好地满足"电子围墙"安全防护系统的要求.     

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.     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the