西藏甲玛铜多金属矿床主要矿石矿物特征

采用镜下鉴定及电子探针方法,研究西藏甲玛铜多金属矿床主要矿石矿物特征.显徽镜鉴定结果表明,矿石结构主要为结晶结构、交代结构及固溶体分离结构;矿石构造以细脉浸染状构造为主,中等浸染状、稠密浸染状、块状构造次之.矿石类型较为复杂,以原生硫化物矿石为主,次为氧化物矿石和混合型矿石.据赋矿岩石不同可将矿石划分为夕卡岩型、角岩型;据矿床矿石矿物组合可将矿石划分为方铅矿-闪锌矿矿石、黄铜矿-辉钼矿矿石、辉钼矿矿石、黄铜矿矿石、黄铜矿-斑铜矿矿石、黄铜矿-斑铜矿-黝铜矿矿石6种类型,且此6种矿石类型在垂向上自上到下呈现依次过渡的趋势.矿石矿物的电子探针数据分析表明,矿石有用组分主要为铜、钼、铅、锌,此外伴生有丰富的银、金等元素.初步厘定了矿床成矿期次,进一步明确了矿床类型属夕卡岩型-角岩型矿床.     

胶东大磨曲家金矿床矿石及金矿物特征

大磨曲家金矿床为破碎带含金蚀变岩型金矿床,其矿石主要为黄铁绢英岩、黄铁绢英岩化碎裂岩、多金属矿化矿石及少量含金石英脉。矿床主要经历热液和表生2个成矿期及5个成矿阶段。主要载金矿物为黄铁矿。金矿物为自然金和银金矿,金的赋存状态为包裹体金、晶隙金、裂隙金,以裂隙金和晶隙金为主,二者占79％;金矿物粒度以中细粒为主,占69％。     

四川拉拉铜矿矿石特征研究及其意义

四川拉拉铜矿为我国著名的大型富铜矿床,长期以来,不同学者从不同角度对其成因进行了探讨。根据现阶段的研究成果,认为该矿床为较典型的火山-沉积变质矿床。笔者在矿区系统采集了典型矿石样品,并从矿石类型、组构,矿石矿物成分、化学成分等四个方面对矿石特征进行了系统研究,为矿床成因提供了一定的理论依据。矿石的结构、构造,矿石中黄铁矿、磁铁矿等主要矿物的化学成分以及矿石的化学成分等特征均在一定程度上反映了拉拉铜矿为火山-沉积变质成因。     

广东茶洞银多金属矿床地质特征和成因探讨

通过野外地质调查、镜下鉴定及对矿床以往资料的综合研究,对茶洞银多金属矿床地质特征、矿石组构、矿物成分、成矿期及成矿阶段进行分析总结,并对矿床成矿作用过程进行了初步探讨。结果表明：矿床矿石具浸染状、脉状、网脉状及块状构造,结构以自形-半自形粒状、不规则粒状和交代为主。矿石成分以氧化物和硫化合物为主,矿物组合主要为银（金）-铅锌系列,以硫化物为主,代表矿物有黄铁矿、毒砂、方铅矿及银矿物等。矿物组合表现为中低温矿物组合特征,成矿温度以中低温为主。矿床成矿过程具有多期、多阶段特点,其中气水热液成矿期为主成矿期,可进一步划分为石英-硫化物阶段和碳酸岩-铅锌硫化物阶段,茶洞银金矿床是在地层、构造及岩浆岩等因素共同作用下形成的中低温热液型矿床。     

安徽铜山前山南矿段矿石工艺矿物学特征

通过对铜山前山南矿段的矿石进行工艺矿物学研究,查明了矿石的化学组成、矿物组成、矿石结构构造、主要矿物的嵌布特征以及金的赋存状态。金矿物以银金矿为主,少量自然金,主要包裹于黄铜矿、斑铜矿、辉铜矿中,形态不规则,微细粒。     

海潮铜矿地质特征研究——以四川省会理市为例

铜矿是一种非常珍贵的资源，如何寻找到富铜矿体一直是矿业的研究重点。对铜矿成矿地质进行分析能够有效为寻找富铜矿体提供理论支持。本文主要对四川省会理市铜矿的地质特征进行分析，探讨其矿区地质背景、地层、构造、成矿地质特征以及相关的矿石结构等，通过综合研究，总结出海潮铜矿矿床的成因及找矿标志，为矿床开发利用提供地质依据。     

某铜矿多金属矿石工艺矿物学研究

某铜矿矿石矿物种类较多,主要有回收价值的金属矿物有磁铁矿、黄铜矿和辉钼矿、金银矿物等.对铜矿铜多金属矿石进行了工艺矿物学研究,研究了矿石物质组成、主要金属矿物浸染粒度、主要矿物产出特征、矿石结构构造,金银矿物特征.该矿石中有价元素较多,具有较高的开发利用价值.     

论大宝山矿床成因

通过对大宝山矿区各矿床产出的地质环境，矿体产状，矿石类型和结构构造，矿石稳定同位素特征，稀土元素特征，成矿温度等方面的研究，论证矿区的在矿历史分２个成矿期，４个成矿阶段，即中泥盆世多金属成矿期的铜铅锌银硫化物成矿阶段，菱铁矿成矿阶段，早白垩世铁钼钨成矿期的铁钨成矿阶段钼钨成矿阶段。     

甘肃小独山钨矿床矿石特征

文章对甘肃小独山钨矿床矿石类型、矿石组构、成分、主要有用组分赋存状态及其连生矿物镶嵌关系进行了论述,表明小独山钨矿床矿石类型以石英脉型为主,蚀变岩性为辅;矿石组构较为复杂;矿石成分简单,矿石矿物主要为白钨矿,其次为黑钨矿,白钨矿粒度多在0.02-0.1 mm之间;连生矿物间以平直毗连镶嵌为主,嵌布程度较均匀,属易选矿石。     

下桐岭钨多金属矿床地质特征及成矿作用

从成矿地质背景、矿体形态产状、矿石矿物成分和结构构造及围岩蚀变等不同侧面描述了下桐岭钨多金属矿床的地质特征,并从花岗岩自变质作用、成矿流体的成分变化和成矿介质的酸碱更替等方面对其成矿作用进行了初步探讨。     

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。     

Preparation of gadolinium,terbium, dysprosium,erbium, thulium,and lutecium dicarbides

Summary A study was made of the conditions of preparation of gadolinium, terbium, dysprosium, erbium, thulium, and lutecium dicarbides by the method of vacuum reduction of oxides of the corresponding metals.It was established that 1800°C is the optimum temperature for the preparation of these dicarbides. It is assumed that the formation of the dicarbides at the same temperature is linked with the similarity of the electronic structures of the rare-earth metals.Translated from Poroshkovaya Metallurgiya, No. 8(56), pp. 34–38, August, 1967.     

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。     

Analysis of mepivacaine, bupivacaine, etidocaine, lidocaine, and tetracaine

A GLC method, employing a nitrogen-phosphorus-sensitive detector, is described for the analysis of mepivacaine, bupivacaine, etidocaine, lidocaine, and tetracaine in biological fluids. The method is simple, reliable, and sensitive, with a practical limit of sensitivity of approximately 2.5 ng/ml, well below therapeutic plasma levels. Extensive start-up procedures and sample preparation are not required.     

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。     

Synthesis of sulfur-linked analogues of nigerose, laminarabiose, laminaratriose, gentiobiose, gentiotriose, and laminaran trisaccharide Y

Sulfur-linked analogues of 3-O-alpha-D-glucopyranosyl-D-glucose (nigerose), 3-O-beta-D-glucopyranosyl-D-glucose (laminarabiose), 6-O-beta-D-glucopyranosyl-D-glucose (gentiobiose), O-beta-D-glucopyranosyl-(1-->3)-O-beta-D-glucopyranosyl-(1-->3)-D-glucos e (laminaratriose), O-beta-D-glucopyranosyl)-(1-->6)-O-beta-D-glucopyranosyl-(1-->6)-D-gluco se (gentiotriose) and 3,6-di-O-beta-D-glucopyranosyl-D-glucose (laminaran trisaccharide Y), namely, respectively, 3-thionigerose (6), 3-thiolaminarabiose (11), 6-thiogentiobiose (21), 3I,3II-dithiolaminaratriose (16), 6I,6II-dithiogentiotriose (29) and 3I,6I-dithiolaminaran trisaccharide Y (37) have been conveniently prepared by SN2 reactions of the corresponding anomer of D-glucopyranose 1-thiolate with suitably activated monosaccharide derivatives in N,N-dimethylformamide (for 6 and 21) or in tetrahydrofuran in the presence of a crown ether (for 11). A sequence involving the reaction of non-anomeric thiolates with 2,3,4,6-tetra-O-acetyl-alpha-D-glucopyranosyl bromide was alternatively used for the preparation of 11 and 21 but proved less satisfactory. The preparation of thiotrisaccharides 16, 29, and 37 involved a mixed approach.     

X射线荧光光谱法测定烧结矿中Fe,Al,Ca,Mg,Si,S,Mn,P

烧结矿是高炉冶炼的重要原料之一 ,准确快速分析烧结矿中主、次量元素 ,对于指导烧结矿及高炉生产具有重要意义。由于烧结矿日常分析元素较多 ,采用化学分析方法 ,分析时间长 ,手续繁琐。本文利用多道同步Ｘ射线荧光光谱仪 ,合理选择分析及制样条件 ,对烧结矿中主、次量元素进行分析。结果表明 :该法分析速度快、准确度高 ,完全满足日常分析的要求。1　实验部分1 1　仪器及工作条件Ｓｉｍｕｌｔｉｘ 1 1型Ｘ射线荧光光谱仪 (日本理学 ) ,盘式振动磨 (ＷＣ材质 ) ,5 0ｔ油压机。工作条件 :Ｘ光管 ( 4 0ｋＶ - 2 5ｍＡ) ,Ｐ1 0气体流量 2 5ｍ…     

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.     

Relation of benzodiazepine use to the risk of selected cancers: breast, large bowel, malignant melanoma, lung, endometrium, ovary, non-Hodgkin's lymphoma, testis, Hodgkin's disease, thyroid, and liver

Some animal data have raised the possibility that benzodiazepines influence the risk of selected cancers. With data collected in 1977-1991 in a US hospital-based study, the authors assessed the relation of benzodiazepine use to the risk of 11 cancers: breast (6,056 patients), large bowel (2,203), malignant melanoma (1,457), lung (1,365), endometrium (812), ovary (767), non-Hodgkin's lymphoma (382), testis (314), Hodgkin's disease (299), thyroid (111), and liver (37). Cases were compared with cancer controls (3,777 patients with other cancers) and noncancer controls (1,919 patients admitted for acute nonmalignant disorders). Relative risks were estimated for benzodiazepine use at least 4 days a week for at least 1 month, initiated at least 2 years before admission (sustained use) by multiple logistic regression with control for confounding factors. Results derived with noncancer controls were similar to those derived with cancer controls. For sustained benzodiazepine use relative to no use, relative risk estimates for all 11 cancers were compatible with 1.0 at the 0.05 level of significance. Relative risk estimates for durations of at least 5 years were also compatible with 1.0, with the exceptions of an increased estimate, of borderline statistical significance, for endometrial cancer, and a decreased estimate for ovarian cancer. Relative risk estimates both for sustained use that continued into the 2-year period before admission and for sustained use that ended up to > or = 10 years previously were compatible with 1.0, suggesting a lack of tumor promotion and no increase in the risk after a latent interval. Results were also null for diazepam, chlordiazepoxide, and other benzodiazepines considered separately. The results suggest absence of association between benzodiazepine use and the cancers considered, with the evidence stronger for the cancers with larger numbers of subjects. The similarity of results derived with cancer and noncancer controls suggests that benzodiazepines do not influence the risk of cancer as a whole.