Ionospheric response to the geomagnetic storm on 13–17 April 2006 in the West Pacific region

This paper presents an investigation of geomagnetic storm effects in the equatorial and middle-low latitude F-region in the West Pacific sector during the intense geomagnetic storm on 13–17 April, 2006. The event, preceded by a minor storm, started at 2130 UT on April 13 while interplanetary magnetic field (IMF) B_z component was ready to turn southward. From 14–17 the ionosphere was characterized by a large scale enhancement in critical frequency, foF2 (4～6 MHz) and total electron content (TEC) (～30TECU, 1TECU=1×10¹⁶el/m²) followed by a long-duration negative phase observed through the simultaneous ionospheric sounding measurements from 14 stations and GPS network along the meridian 120°E. A periodic wave structure, known as traveling ionospheric disturbances (TIDs) was observed in the morning sector during the initial phase of the storm which should be associated with the impulsive magnetospheric energy injection to the auroral. In the afternoon and nighttime, the positive phase should be caused by the combination of equatorward winds and disturbed electric fields verified through the equatorial F-layer peak height variation and modeled upward drift of Fejer and Scherliess [1997. Empirical models of storm time equatorial electric fields. Journal of Geophysical Research 102, 24,047–24,056]. It is shown that the large positive storm effect was more pronounced in the Southern Hemisphere during the morning-noon sector on April 15 and negative phase reached to lower magnetic latitudes in the Northern Hemisphere which may be related to the asymmetry of the thermospheric condition during the storm.     

利用重复水准测量及重力测量计算水准面随时间的变化

本文讨论了根据重复水准、重力测量资料利用虚拟质点法计算水准面随时间的变化,提出了虚拟质点位置参数的优化方法(该法克服了司托克斯方法和配置法的缺点)。模拟计算表明,水准面位移的计算精度是很高的。     

日冕物质抛射的理想MHD模型研究

概括了日冕物质抛射的一些观测结果和它们与其它太阳活动现象的相关性。简要回顾了较早期日冕物质抛射的理论研究,着重介绍了最近研究得较多的理论机制,即能量储存机制,以及其中的磁通量绳突变模型与其它理论模型的MHD数值和解析研究以及相应的重要应用．     

浙江中生代陆缘火山岩金矿成矿系统

浙江地处中国东南沿海大陆边缘火山岩成矿带，已发现众多金（银）矿床（点），它们在空间上往往不是孤立地出现，而是在数十至数百平方公里内围绕岩浆热中心相对集中，并与有色金属在矿田范围内伴生。研究证明，金（银）及有色金属矿床是同一火山—侵入旋回过程中形成的有成因联系的矿床。笔者将这种在同一火山—侵入旋回间，围绕同一个岩浆热中心，在不同深度和水平距离内形成的一系列具有成因联系的金（银）和有色金属矿床的总和称为火山岩金矿成矿系统。本文在此概念基础上，详细论述了浙江中生代陆线火山岩金矿成矿系统的类型。时空结构和物质来源。     

Acute toxicities of potassium permanganate, formalin, and Lugol’s iodine solution to a marine ciliate, Pleuronema coronatum (ciliophora, scuticociliatida)

Acute toxicities of potassium permanganate, formalin, and Lugol’s iodine solution to a commonly occurred marine ciliate Pleuronema coronatum (Ciliophora, Scuticociliatida) were measured. Linear regression analysis of the results highlighted the close relationships between doses of the medicines and mortalities of the organisms, thus providing a capability to predict toxicity effects from the dose. Toxic effects of the medicines on the ciliates were described in the present paper, and the median lethal concentrations (LC₅₀ values) were given. Results of measurements indicated that 2 h-LC₅₀ and 12 h-LC₅₀ values of formalin on P. coronatum were 59.00×10⁻⁶ and 43.57×10⁻⁶, while those of Lugol’s solutions were 90.13 and 67.84×10⁻⁶ respectively. The tolerance of P. coronatum to formalin is apparently lower than that to Lugol’s iodine solution and potassium permanganate is a suitable medicine to kill ciliates in short time.     

东营市湿地资源分布及地质环境脆弱性评价

通过遥感解译、水土样测试、环境地质调查,从地表水、坑塘水、平原水库、浅层地下水、土壤环境的质量评价入手,查明了东营市湿地的分布现状,分析湿地演变与地质环境条件之间的相关性,构建东营湿地地质环境脆弱性评价体系并进行了脆弱性评价,为促进湿地生态系统与区域地质环境协调发展提供科学依据。     

地分割证在房地产交易中的应用

当前，各地房地产市场活跃，房地产交易日益频繁，房地产价格一路攀升，在房地产交易中，当你用攒了半辈子的钱买了一套新房却长期拿不到土地使用证的时候，当你想进行房地产交易却因“两证”不全暗自焦急的时候，当你为办理各种房产证明不得不四处奔波的时候，就会想有没有一种措施能做到便民、省心呢？     

基于GIS的磐石市地下水环境质量分析

基于ArcGIS建立了磐石市29个监测点的水质信息数据库,采用灰色聚类法进行地下水环境质量评价。利用GIS的空间分析功能,分析地下水中常规组分的空间分布特征,掌握了地下水质量状况。磐石市大部分地区地下水质量良好,达到、级标准。地下水中化学组分的含量从郊区向市区逐渐增加,市区地下水质量为、级标准。地下水已遭受污染,地下水开采降落漏斗区地下水位的持续下降是市区地下水遭受污染的主要诱发因素。     

Identification and sequence of a cDNA clone corresponding to a gene involved in development ofUndaria pinnatifida

During the induction of gamete-producing gametangia, induced gametophytes were collected at 4 days intervals (0,4,8,12 d) and total RNAs were isolated by CsCl gradient ultracentrifugation. Some stage-specific expressed mRNAs were identified by differential display of mRNAs from different developing stages of the gametophytes. The cDNA of one specific mRNA was verified, cloned and sequenced. This gene was specifically expressed during 4 days of induction, and had partial homologous sequence with tobacco IAA-binding protein gene. It suggests that this cDNA may represent a gene which is related to the IAA regulating function during the development of the gametophytes.