惠斯通电桥教学电路的分析

在惠斯通电桥原理电路的基础上，讨论了教学实验中自组电桥测量电路的仪器选择，举例分析了自组电桥测量电路的使用和测量结果，指出不同自组电桥测量电路在教学应用中的优点，为实验教学中突出教学重点而选择电路提供参考。     

位移优化反分析在区域几何参数确定中的应用

将有限单元和可变容差法相结合，将几何参数的反分析归结为一个带约束条件的非线性优化问题。应用此模型也可反分析材料力学参数和边界荷载。两个算例表明了模型的良好性能。     

基于替换的组合电路的等价性检验方法

介绍了基于替换的组合电路的等价性检验算法，利用待检验的两个电路的结构相似性来逐步约简电路，从而加速了验证过程。     

中尺度MM4模式及其伴随模式

伴随方法是以数值天气预报的动力模作为约束条件的变分方法，相对传统的资料同化方法有很大的进步。介绍美国NCAR的中尺度MM4模式人它的伴随模式MAMSA1，它以一个有限区域的中尺度非线性预的模式模式为基础，采用伴随模式地其进行资料同化和预报。     

线性状态等式约束下两种H∞滤波的比较

近年带有线性等式约束的H∞滤波在实际应用中越来越广泛,针对此种情况,从理论上研究了线性状态等式约束下两种H∞滤波状态估计性能的比较问题。在投影系统和H∞滤波方程的基础上,考虑线性状态等式约束条件,给出了一种含线性状态等式投影系统约束的H∞滤波。通过比较其与状态投影下的H∞滤波的估计性能,指出并证明了投影系统约束的H∞滤波的估计性能优于状态投影下的H∞滤波的估计性能。最后给出一个数值模拟例子,来验证结论。     

大屏幕数显电子温度检测器

讨论了大屏幕数字温度显示的几种方案，介绍了一种性能、价格比优良，电路较简单的总体方案及其电路原理。     

约束条件对滑坡涌浪特征影响的室内试验研究

水库滑坡约束条件影响其运动过程的几何形态, 是滑坡涌浪预测的重要参数之一。为了探究约束条件对滑坡涌浪特征(波高、波幅与周期)的影响, 采用正交试验设计法开展了54组滑坡涌浪室内模型试验, 并基于统计学理论对约束散体和半约束散体的涌浪特征进行了分析。结果表明: 涌浪波周期基本不受滑体约束条件的影响; 而半约束散体模型的波高和波幅小于约束散体的波高和波幅, 半约束散体的初始涌浪波高约为约束散体的0.95倍, 半约束散体模型的最大波峰波幅约为约束散体模型的0.9倍。因此, 在开展滑坡涌浪快速预测时, 虽然滑体入水形态与破坏前形态差异巨大, 但基于滑坡初始几何形态参数对其初始涌浪波高和最大涌浪波幅的预测结果是偏安全的。研究结论可以为更准确地预测水库滑坡涌浪提供理论依据。      

平面状态的应变复数与应力复数的关系及应用

本文对材料力学中的各向同性弹性体材料，导出了用应变复数表述的应力关系式，用该关系式分析了应力与应变之间的关系，并以该关系式对给定的应变分量直接进行平面应力状态的应力分析，计算简便、直观。     

县级“121”备份系统的电路实现技术

介绍了采用语音电路技术及双音多频（DTMF）解码技术，实现了“121”语音分信箱自动答询的电路实现技术。该系统具有电路实现简单、成本低，可靠性高的特点，与相关软件配合，或单独使用，均可实现“121”语音制作、自动答询的功能，该系统在停电或微机故障的情况下，利用电池供电也能正常工作，适合基层气象台作为“121”备份系统使用。     

一种新型的多界面液位传感器设计

设计一种基于ATmegal 6芯片作为微控制器的电容测量电路,适应多种电容式传感器测量的需求。利用正弦波实现了小电容量的相位检测,根据电路参数计算电容容值,还可以根据具体情况调整电路参数,电路适用性广。理论分析和仿真证明,这种多界面的智能液位传感器具有优良的性能。     

Thermohaline structure inhomogeneity associated with polynia at the northern margin of Emery Ice-shelf

Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area.     

Phylogenetic analysis of cultivable bacteria isolated from Arctic sea-ice

Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter.     

Information for authors

正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied     

Advances in Polar Science CONTENTS(Volume 25,2014)

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Guide to Authors： Journal of Mountain Science

<正>AIMS AND SCOPE(Editorial Policy)The Journal of Mountain Science(JMS)is devoted to mountains and their surrounding lowlands-ecoregions of particular global importance,with a particular emphasis on the important highlands/mountains in the world,such as the Tibetan Plateau,the Himalayas,the Alps,the Andes,the Rockies and many other mountain ranges of our planet.     

Journal of Mountain Science(JMS)

<正>The Journal of Mountain Science(JMS),founded in2004,is an international English-language journal on mountain sciences.JMS is supervised by the Chinese Academy of Sciences(CAS),sponsored by the Chengdu Institute of Mountain Hazards and Environment,CAS,published by Science Press China,and distributed by Springer exclusively throughout the world(excluding Mainland China).The JMS is published bimonthly,fulltexted in SpringerLink and CNKI,indexed/abstracted by     

Relationship of Arctic sea ice and Northern Hemispheric 500 hPa Polar vortices

Using the NCEP/NCAR reanalysis monthly 500 hPa height data on a 2.5 latitude-longitude grid and 1°×1° sea ice data,the polar vortex area,intensity index and arctic sea ice area index are calculated respectively,and the meridional distribution,period variation and the abrupts in the long range trend are analyzed to study their relationship.The results show that the meridional distribution of sea ice and polar vortex h-ave distinctive difference,the relative positions of them are different in the eastern and western hemispheres,and exept they have periods of 4 months,quasi half year,quasi year,4-5 years and 10 years commonly,and each of them has its own respective variation as well.The sea ice area is decreasing apparently since 1980's,so is the polar vortex area,but their abrupt changge time are different totally.The area of sea ice and polar vortex has prominent positive correlation,but the relationship of sea ice intensity,polar vortex intensity,polar vortex area is complicated.     

Author Index for Journal of Mountain Science Volume 11,2014,pp 1-1656

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Information for Authors

<正>The Journal of Ocean University of China(Oceanic and Coastal Sea Research)is a comprehensive academic quarterly sponsored by the Ocean University of China,published one volume per year.This journal is devoted to the publication of the theoretical and applied research