论黔南地区二叠世梁山期岩相古地理特征对铝土矿的成矿作用

铝土矿为贵州主要优势矿产之一,但对贵州黔南地区铝土矿成矿条件,多数观点认为该区成矿条件相对较差,通讯作者等人通过对野外实地工作,采用地质、物探、钻探等综合勘查手段对该区的瓮安复向斜岩相古地理特征进行研究分析,将该区从北往南划分为并对该区古沉积环境进行初步研究发现,该区瓮安一带泻湖相区古岩溶漏斗对铝土矿厚度存在明显的正相关关系,福泉一带庐山深湖相区边缘成矿条件也较为有利,最终通过钻探证实,其特征与研究预测相一致,实现了该区铝土矿的重大突破。     

澳大利亚达令山南部地区铝土矿地质特征及成因浅析

澳大利亚达令山南部地区铝土矿位于品加拉造山带北部的潘伯拉—布瑞莫花岗岩、片麻岩带上,区域成矿地质背景良好。本文结合矿区地质工作成果,从矿区地层、构造、岩浆岩等方面归纳了矿区的成矿地质背景,总结了矿床地质特征,分析了矿床成因,其分析结果对该区进一步开展铝土矿找矿勘查工作有一定的借鉴价值。     

广西龙州县那龙铝土矿地质特征及成矿规律简析

在分析研究那龙区域成矿地质背景、矿床地质特征的基础上，总结归纳了堆积型铝土矿的矿体成因。结合那龙矿区的成矿规律，认为该地区成矿作用与附近科甲矿区、金龙矿区的矿源层、构造、气候、地貌等因素基本相同，对其他具有相似地质特征区域的找矿起到一定指导和参考作用。     

遵义南部地区铝土矿矿床地质特征及找矿方法

遵义南部地区由于受传统地质工作方法限制,仅局限于以"露头"找矿模式。论述了遵义南部地区铝土矿矿床地质特征,通过对区域成矿地质背景,铝土矿富集与古岩溶地貌的关系,地球物理异常特征,分析认为该区铝土矿主要产出于泻湖相。在该相区采用音频大地电磁测深(AMT)方法圈出与铝土矿赋存富集相关的古岩溶基底坑洼,在古岩溶漏斗或低洼处布设钻孔进行"攻深找盲"寻找铝土矿盲矿体(床),以实现遵义南部地区铝土矿找矿方法的新突破。     

天井源金矿区成矿地质特征及矿床成因浅析

天井源金矿区位于赣东北地区,地处扬子板块与华南板块对接带北侧。该区区域褶皱构造和断裂构造发育,成矿地质条件优越。本文在分析天井源金矿区成矿地质特征的基础上,对该区矿床成因进行了分析,最后指出了矿区找矿标志。     

里伍矿田构造特征及控矿规律

里伍矿田位于松潘-甘孜造山带的南缘,康滇地轴北段西部。本文对该穹隆的区域地质背景、构造地质特征、及穹隆构造变形与成矿关系进行了分析。综合分析认为,从矿田构造角度探讨了该区铜矿成矿地质条件。通过对矿田内主要的构造特征进行总结,认为区内该穹隆成矿作用受面理、褶皱、断裂等构造作用的影响,矿体主要受穹隆体多层次韧性剪切滑脱带的控制。     

江西省赣县茶田洞钨多金属矿点找矿前景分析

本文通过研究区域地质背景及该区成矿地质特征进行对比分析,从地层、构造、岩浆岩条件进行了分析,并与已知矿床进行了类比,认为该区在构造～岩浆～成矿复合地段是寻找大脉带或细脉大脉混合岩浆期后高温热液裂隙充填型脉状钨矿,兼顾银铅锌等矿产。     

苟江预测区铝土矿地质特征及找矿潜力分析

通过结合周边矿区区域地质背景、典型矿床地质特征、成矿条件的分析,对预测区找矿潜力进行了预测。为苟江-后槽溶蚀洼陷带该区铝土矿后期勘查工作提供了预测分析依据,开展勘查工作后有望取得较大的找矿突破。     

湖南省黄垢矿区土壤地球化学测量特征及找矿前景

黄垢矿区位于雪峰弧形构造带西南端,成矿地质条件十分有利。通过对该区开展1:1万土壤地球化学测量,分析元素地球化学异常特征及地质背景,圈定了6个综合异常,结合成矿地质条件分析,认为该区找矿前景较好,对该区继续开展工作,有望获得突破性找矿进展。     

河南省新县林场钼矿成矿地质特征及找矿预测

从区域成矿地质背景、矿床特征等方面介绍了林场钼矿成矿地质特征,并对控矿因素、找矿标志进行分析,认为该矿床属斑岩型钼矿,该区钼矿形成具多阶段性和长期性。本文试图通过对该区钼矿的成矿地质特征、控矿因素的分析,更新并扩大找矿思路,对指导该区地质找矿工作具有重要意义。     

ICP-AES法测定铍铜合金中Be, Ni, Ti, Co, Fe, Al, Si, Mg和Pb

通过操作条件的试验研究，用基体匹配法校正基体干扰，并选择了最佳工作条件。样品加标回收率为96％～110％，方法快速、简便、可靠，适用于铍铜合金的快速检验。     

Regional mapping panels for chromosomes 3, 4, 5, 11, 15, 17, 18, and X

The erm family of 23S rRNA adenine-N6-methyltransferases confers resistance to all macrolide-lincosamide-streptograminB (MLS) antibiotics, but not all MLS antibiotics induce synthesis of Erm methyltransferase with equal efficiency in a given organism. The induction efficiency of a test panel of MLS antibiotics was studied by using two translational attenuator-lac reporter gene fusion constructs, one based on ermSV from Streptomyces viridochromogenes NRRL 2860 and the other based on ermC from Staphylococcus aureus RN2442. Four types of responses which were correlated with the macrolide ring size were seen, as follows: group 1, both ermSV and ermC were induced by the 14-membered-ring macrolides erythromycin, lankamycin, and matromycin, as well as by the lincosamide celesticetin; group 2, neither ermSV nor ermC was induced by the 12-membered-ring macrolide methymycin or by the lincosamide lincomycin or the streptogramin type B antibiotic ostreogrycin B; group 3, ermSV was selectively induced over ermC by the 16-membered-ring macrolides carbomycin, chalcomycin, cirramycin, kitasamycin, maridomycin, and tylosin; and group 4, ermC was selectively induced over ermSV by the 14-membered-ring macrolide megalomicin. These data suggest that the leader peptide determines the specificity of induction by different classes of MLS antibiotics and that for a given attenuator, a major factor which determines whether a given macrolide induces resistance is its size.     

铂饰品中Pt, Pd, Au, Ag, Cu, Ni, Zn, Fe的测定

试验研究建立了同一试料溶液连续、同时测定铂饰品中各成分的分析方法。主体Pt以氯铂酸铵称量法及火焰原子吸收光谱(FAAS)法或电感耦合等离子发射光谱(ICP-AES)法测定滤液中残留Pt进行补差而测定。主成分Pd,Au,Ag,Cu和焊料成分Ni,Zn,Fe以FAAS法或ICP-AES法测定。其方法回收率分别为:Pt99.9%~100%;Pd99.3%~99.7%;Au99.5%~l01.5%;Ag98.0%~100%;Cu97.7%~99.3%;Zn98.0%~99.0%;Ni94.0%~105%;Fe95.0%~99.0%。实际试样分析时,各成分质量分数之和一般在99.12%~l01.2%之间,接近于100%,间接说明方法的可靠性。本法适用于Pt-Pd二元体系和Pt-Pd-Au-Cu多元复杂体系的铂饰品的破坏分析,可用于校正X荧光光谱法无损检测铂饰品的分析结果。     

稀土金属中14种非稀土杂质的ICP-MS法同时测定

本文研究了用 ICP- MS仪器同时测定稀土金属中 Mg、Al、Ti、Cr、Mo、Mn、Co、Ni、Cu、Zn、Pb、W、Nb、Ta等 14种非稀土杂质。研究了各稀土基体对被分析元素的基体效应 ,选择了相匹配的内标元素。比较了标准曲线法与标准加入法的测定结果。确定了用内标元素校正基体效应及仪器漂移 ,以标准曲线法直接测定。进行了加料回收和精密度实验 ,回收率在 94%～ 113%之间 ,RSD<10 %。被分析元素的检出限为 0 .0 1～ 0 .2 0 ng/ m L,测定下限为1～ 2 0 μg/ g。     

Increased-contrast, high-spatial-resolution, diffusion-weighted, spin-echo, echo-planar imaging

An insertable head gradient coil with a maximum gradient amplitude of 45 mT/m and a rise time of 150 musec along all three major axes was used to collect high-spatial-resolution, single-shot, spin-echo, echo-planar, diffusion-weighted magnetic resonance images with b values ranging from 0 to 2,200 sec/mm2. Improvements in spatial resolution allowed better visualization of large white matter tracts and their relation to adjacent anatomic structures. Excellent contrast and anatomic detail were revealed for most structures in the brain when a sufficient number of acquisitions were collected.     

原子荧光光谱法测定土壤中的铅、铬、镉、汞、砷、锌、铜、镍等元素研究

土壤无机污染物铅、铬、镉、汞、砷、锌、铜、镍这八大重金属,是一般土壤检测中的必检项目。金属元素在土壤中积累富集后,有可能通过雨水迁移,造成地下水,地表水污染,或者通过农作物进入食物链,进而影响食品安全和人体健康,因此,对这些元素的检测显得尤为重要。本文采用原子荧光光谱法对土壤中的金属元素进行测量,同时结合微波消解技术对样品进行处理,确保测量数据的准确性。     

Susceptibilities of non-Pseudomonas aeruginosa gram-negative nonfermentative rods to ciprofloxacin, ofloxacin, levofloxacin, D-ofloxacin, sparfloxacin, ceftazidime, piperacillin, piperacillin-tazobactam, trimethoprim-sulfamethoxazole, and imipenem

Agar dilution MICs of 10 agents against 410 non-Pseudomonas aeruginosa gram-negative nonfermentative rods were determined. MICs at which 50 and 90% of the isolates were inhibited, respectively, were as follows (in micrograms per milliliter): sparfloxacin, 0.5 and 8.0; levofloxacin, 1.0 and 8.0; ciprofloxacin, 2.0 and 32.0; ofloxacin, 2.0 and 32.0; D-ofloxacin, 32.0 and > 64.0; ceftazidime, 8.0 and 64.0; piperacillin with or without tazobactam, 16.0 and > 64.0; trimethoprim-sulfamethoxazole, 0.5 and > 64.0; imipenem, 2.0 and > 64.0. With the exception of those for Stenotrophomonas maltophilia, Burkholderia cepacia, and Alcaligenes faecalis-A. odorans, agar dilution MICs for all strains tested were within 1 dilution of inhibitory (bacteriostatic) levels as determined by time-kill methodology.