兴海县什多龙铅锌矿地质特征及成矿规律分析

青海省什多龙铅锌矿是鄂拉山成矿带一个铅锌为中型规模,银为小型规模的综合性矿床。矿床成因类型属接触交代矽卡岩型铅锌矿床。矿体赋存于花岗斑岩或花岗闪长岩与碳酸盐岩接触带及其附近,成矿母岩岩性、产状对矿化有较大影响,铅锌矿化标高不同而异。地表矽卡岩母岩、各种石英蚀变岩,特别是透辉矽卡岩是明显的热液蚀变迭加的广义矽卡岩,对寻找铅锌矿有利。中酸性—酸性侵入岩与碳酸盐岩接触带及其附近,是寻找接触交代矽卡岩矿床的有利地段。目前提交的资源量,什多龙铅锌矿已达中型矿床规模。但是,仍有扩大矿床规模的可能。     

青田县贵岭铅锌矿地质特征及矿产成因探讨

对贵岭矿区铅锌矿矿床地质特征进行总结,通过分析成矿温度、成矿流体、成矿物质来源和成矿时代,总结矿床成因,认为矿床成因为中低温火山热液交代充填型。     

豫北杨家庄外围铁矿床地质特征及矿床成因分析

杨家庄外围铁矿床位于华北地区重要的接触交代型铁矿基地——豫北安林地区,成矿条件良好。矿体产于O_2m~3灰岩与闪长岩的接触带中。文章在阐述成矿地质背景、矿体地质特征、找矿标志的基础上,分析了稀土元素特征,总结了矿床成因,认为矿床为接触交代型铁矿。     

辽宁省葫芦岛市陈家屯铜多金属矿地质特征及找矿标志

陈家屯铜多金属矿是以铜金银为主要有用元素的接触交代型多金属矿,矿体受石英二长闪长岩、奥陶系灰岩和构造综合控制。区内己发现三条Cu多金属矿体,Cu含量一般为1.57×10(-2)~4.36×10~(-2),伴生元素为Ag、Au。通过对区内成矿地质特征及矿体组合特征研究认为:区内矿床形成是石英二长闪长岩带来的含矿热液在灰岩接触部及灰岩的裂隙中形成矽卡岩型矿床。接触带、灰岩中的构造裂隙是有利的赋矿部位。     

新疆西昆仑天柱山铅锌矿地质特征及成矿远景

对天柱山铅锌矿的成矿地质条件、控矿因素和成矿远景进行了初步分析,总结了成矿规律和控矿因素,建立找矿标志。结果表明:天柱山铅锌矿位于西昆仑神仙湾古生代边缘裂陷带特提斯成矿域-林济塘成矿带,区域上受西昆仑乔尔天山-岔路口断裂控制,矿体产出部位严格受灰岩-灰岩及构造破碎带控制,矿体呈层状或透镜状,围岩主要为蚀变黑色泥晶灰岩;主要矿石矿物为方铅矿和闪锌矿,矿床类型与密西西比河谷型矿床类似。由于矿床位于昆仑神仙湾古生代边缘裂陷带特提斯成矿域-林济塘成矿带,铅锌矿床资源潜力巨大,同时区域上发现火烧云铅锌矿,具有较好的成矿远景。     

格尔木市空介铅锌矿地质矿产特征及成矿作用分析

空介铅锌矿产于二叠系灰岩和第三系雅西措组(砂质灰岩)地层的接触带上,围岩出现碳酸盐化和硅化等蚀变。初步认为其矿床成因为与新生代逆冲推覆断裂构造有关的中-低温热液型矿床,其矿床类型属密西西比河谷型铅锌矿床,矿床特征与我国云南金顶铅锌矿床较为相似。     

云南省马关县田坝心铜铅锌矿地质特征及矿床成因

本文通过对云南省马关县田坝心铜铅锌矿成矿的地质特征分析,阐述了地层、构造、岩浆活动、变质作用、围岩蚀变多因素控矿条件,认为矿床成因为多阶段汽水热液充填—交代成矿。     

山东省沂水县高庄铜铅矿矿床地质特征及找矿标志

高庄铜铅矿矿床赋存于张夏组下灰岩段中、张夏组下灰岩段和盘车沟页岩段接触面上,矿体在形态上和空间位置上严格受蚀变角砾岩带控制,呈似层状产出,通过对矿区内地层、控矿构造、侵入岩、矿体特征和矿石质量的分析论述,认为该矿床为碳酸盐型中低温热液充填—交代型铜铅矿床。     

甘肃李家山地区多金属矿床地质特征及成因探讨

甘肃西和县李家山多金属矿床位于秦岭造山带西段,处于西成铅锌矿田西延部位,赋矿地层为中泥盆统西汉水群,成矿条件类似。研究表明本区矿床矿化主要为两种类型,一种是产于千枚岩或灰岩中的含铜石英脉型矿体,另一种是产于灰岩与千枚岩接触部位的硅化灰岩型铅锌矿体。它们既受构造控制,又受特定岩性控制,属沉积一改造型“层控”矿床。     

辽宁省八家子多金属矿床成矿理论探讨

八家子多金属矿床地处华北地台北缘,山海关台拱与辽西台陷的结合部位,在二者过渡薄弱地带,中生代构造—岩浆活动非常强烈。多期次多阶段的岩浆活动为矿床提供了充足的热源与成矿来源,在斑岩体周围、岩浆岩体与碳酸盐岩接触部位及断裂、裂隙内形成了斑岩型—矽卡岩型—中低温岩浆热液充填交代型矿床,即复合成因岩浆热液型矿床。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.