镁掺杂钙钛矿复合氧化物的合成及表征     

曲刚  李娜  刘和平  张晓霞 《吉林地质》2009,28(4)

采用溶胶凝胶法以柠檬酸盐为前驱体制备了多晶样品LaMn1-XMgXO3(x=0.0,0.1,0.2,0.3,0.4,0.5),通过XRD分析确定样品是钙钛矿ABO3结构,当镁的掺杂量≤0.3时,样品属于正交晶系结构,pbnm空间群;镁的掺杂量≥0.4时,样品Mn、Mg原子在B位有序排列,形成了ABB'O3双钙钛矿结构。样品的磁性也因掺杂量的变化而改变。  相似文献   

A Re–Os study of molybdenites from the Lanjiagou Mo deposit of North China Craton and its geological significance     

Chunming Han  Wenjiao Xiao  Guochun Zhao  Min Sun  Wenjun Qu  Andao Du 《Gondwana Research》2009,16(2):264

The Lanjiagou Mo deposit is located in the eastern part of the North China Craton. Rhenium and osmium isotopes in molybdenites from the Lanjiagou porphyry Mo deposit have been used to determine the timing of mineralization. Molybdenite was analyzed mainly from granite porphyry, which is characterized by moderate to strong silicification. Rhenium concentrations in molybdenite samples are between 33 and 48 µg/g. Analysis of eleven molybdenite samples yields an isochron age of 181.6 ± 6.5 Ma (2σ). Based on the geological history and spatio-temporal distribution of the granitoids, it is proposed that the Mo deposits in the eastern part of the North China Craton were related to the subduction of the Paleo-Pacific plate during Jurassic time.  相似文献   

信息系统机房防雷技术浅析     

高强  曲扎江措  叶春  朱薇薇  刘彬 《黑龙江气象》2009,26(4):35-36,39

本文重点介绍了中国人民银行西藏昌都地区分行信息系统机房在布线、SPD设计、电磁屏蔽、等电位连接、接地等防雷技术实践中的应用,以保障信息系统安全稳定的运行.  相似文献   

A modified EK method with an I<Superscript>−</Superscript>/I<Subscript>2</Subscript> lixiviant assisted and approaching cathodes to remedy mercury contaminated field soils     

Zhemin Shen  Jianda Zhang  Liya Qu  Zeqin Dong  Shenshen Zheng  Wenhua Wang 《Environmental Geology》2009,57(6):1399-1407

Wanshan mercury mine is the largest cinnabar deposit in Guizhou, China. Few effective methods had been achieved to remedy Hg heavily contaminated field soils. In this paper, a modified EK method with approaching cathodes (AC-EK) and an I⁻/I₂ lixiviant was described to remedy mercury-contaminated field soils near Wanshan mercury mine. Paddy Soil I and Paddy Soil II were sampled and contained 576.73 ± 45.50 and 491.35 ± 4.73 mg/kg Hg, respectively. Although they contained 6.9 and 9.4% organic matter respectively, more than 92 and 89% Hg were removed by AC-EK within 5 days. Removal ratio increased by 0.21 and 0.68 times using EK process with ACs over that with one single cathode (SC-EK). AC-EK method saved nearly 26.4–28.1% electric power as compared to SC-EK method. As an I⁻/I₂ lixiviant solution was used to solubilize HgS(HgO) during EK process, the bonding of Hg to organic functional S groups should be less important than the binding to inner sites of organic matter in soil. The relationship between EK remediation effect and soil organic matter content was fitted to a linear model. It turned out that when soil OM increased by 1.0%, EK removal ratio (%) of Hg would decrease by 2.63%.  相似文献   

卫星热红外观测与发震断层不同段落交替活动特征分析   总被引：6，自引：1，他引：5  

单新建  屈春燕  马瑾 《大地测量与地球动力学》2005,25(2):58-62

利用NOAA卫星资料研究了2001年昆仑山口西8．1级地震前后热红外异常图像的演化特征。结果表明：增温异常条带在东昆仑断裂带不同段落上具有迁移特征。地震前两天首先在库塞湖东西200km范围内出现6℃左右的增温异常条带,在空间位置上与Harvard大学所给出的震中位置和野外考察所给出的宏观震中位置一致。地震前数小时,增温异常迁移到发震断层西段——太阳湖与布卡达板峰段附近,增温幅度约为3℃。与CDSN和USGSD所给出的地震起始破裂位置一致。这种增温异常条带迁移可能与发震断层交替活动有关。震后1天的卫星热红外图像清晰地勾画出发震断层长约450km的线性形迹。代表了整个发震断层的破裂长度．与野外考察所得到的地表破裂带空间位置一致。  相似文献   

Evaluation of the Precision of Three Tropospheric Delay Correction Models     

Wei-Jing Qu  Wen-Yao Zhu  Shu-Li Song  Jin-Song Ping 《Chinese Astronomy and Astrophysics》2008

Using the annual GPS observational tropospheric zenith delay data and meteorological data obtained at 36 globally distributed IGS stations in 2003, we have estimated the accuracy and range of application of two often-used models of tropospheric delay correction (the Hopfield and Saastamoinen models), and of a more recent model (the EGNOS model). We point out some defects in the Hopfield model and show that the EGNOS model can be used as the correction model of the tropospheric zenith delay for the GNSS real-time positioning and navigation.  相似文献   

大港油田埕北断阶带油气运移、成藏期次及成藏模式   总被引：2，自引：0，他引：2  

曲江秀  查明  高长海  张宗峰 《海相油气地质》2009,14(3):37-45

通过原油中类异戊二烯烃地球化学变化特征的对比分析,指出大港油田埕北断阶带的油气主运移方向是由北边的生油凹陷(歧口凹陷)向南(埕北断阶带)运聚和由西边的生油凹陷(歧南凹陷)向(北)东(张东地区、关家堡地区和埕海地区)运聚。利用流体包裹体、生排烃法、饱和压力法等方法技术,认为存在两个充注期:古近纪东营末期和新近纪明化镇末期—第四纪。结合输导体系研究成果,提出了4种油气成藏模式:沿连通砂体—不整合面侧向运聚成藏模式、沿断层垂向运聚成藏模式、沿连通砂体(不整合面)—断层阶梯状运聚成藏模式、源内砂岩透镜体运聚成藏模式。  相似文献   

IAP9L AGCM中大气季节内振荡的时空特征   总被引：4，自引：1，他引：3  

屈述军  张铭 《气候与环境研究》2004,9(4):567-574

根据IAP9LAGCM10年积分850hPa纬向风的逐日输出结果,应用Morlet小波分析方法,研究了该模式中的大气季节内振荡(MJO),结果表明该模式能抓住热带MJO的基本时空特征,模式中MJO的显著周期为36天;另外还分析了16～64天重构信号的时间经度剖面图,发现该MJO为东传,这与实际较一致;最后用EOF方法分析了模式大气中850hPa5天平均速度势,揭示出该MJO在全球表现为行星尺度1波和2波的特征。  相似文献   

淮北宿临矿区构造煤中黄铁矿赋存特征及其地质控制          下载免费PDF全文

李云波  姜  波屈争辉 《地质科学》2017,(3):855-870

通过淮北宿临矿区不同类型构造煤中黄铁矿形态和分布的显微观测,结合常量及伴生元素分布特征分析,探讨了构造煤中黄铁矿的分布规律、形成机制及其地质控制作用。黄铁矿是典型的多期成因矿物,其分布受沉积环境和应力-应变环境共同作用,可划分为4 个形成阶段12 种类型;构造煤中的Co、Sb、Mn 等元素与黄铁矿关系密切,其分布反映应力-应变环境;进一步发现构造煤中的Hg 与硫化铁硫（Sp.d）呈良好相关性,随构造煤变形程度的增加呈“高-低-高”的演变趋势,受构造煤形成的动力学机制影响;构造煤中的黄铁矿可分为同生和后生两种模式,前者受控于沉积环境和古构造条件,而后者与构造改造和构造煤变形相关。分析认为,脆性变形阶段煤体结构的物理变化及过程为黄铁矿发育提供了赋存空间和条件,而韧性变形阶段中的动力变质和力化学作用为元素的迁移、散失及富集提供了动力,从而影响了黄铁矿的形成类型和分布。  相似文献   

台风莫拉克 (0908) 影响期间近地层风特性          下载免费PDF全文

张容焱  张秀芝  杨校生  吴金城  曲海滨 《应用气象学报》2012,23(2):184-194

通过对台风莫拉克 (0908) 影响范围内的33座测风塔观测资料的分析可知:台风莫拉克越靠近陆地,风场的非对称性越明显,其行进方向的左侧测风塔风向呈逆时针旋转,右侧测风塔风向顺时针旋转。在远离台风莫拉克的地方风向稳定,湍流强度变化较平稳;在台风莫拉克登陆点附近,风向、风速和湍流强度均会出现突变。台风莫拉克影响期间,湍流强度与风速的关系未出现IEC标准曲线那样随风速增大稳定减小,其I₁₅达B级和A级及以上的平均湍流强度会在风速7~17 m·s-1形成一个峰值;无论南风或北风,风速越大,各层湍流强度差异趋于减小,同等风速、高度的湍流强度偏南大风均大于偏北大风。位于台风莫拉克登陆点北侧测风塔湍流强度随风速的增加先减小后增大,最终各高度全部超过IEC标准A级曲线,而位于南侧测风塔湍流强度随风速的变化比北侧小,并随风速增大趋于标准A级曲线;另外北侧测风塔湍流强度大于南侧,且各高度偏北大风湍流强度之间的差异比南侧相应风向明显,表明北侧垂直方向的扰动更强。台风莫拉克阵风系数为1.2~1.7,其随高度变化与地形有关,一般情况下随高度升高而减小,在复杂地形条件下不符合随高度升高减小的规律。  相似文献