东昆仑东段浪木日锰镍多金属矿产勘查中的物探技术应用及研究

浪木日成矿区位于东昆仑东段之昆中断裂以北,区内铁质-超镁铁质杂岩体出露,且金属硫化物发育,具有较好的镍多金属成矿潜力。物探异常显示,正负伴生高磁异常区多由超基性岩体引起,异常值一般在-1 200～+2 500 nT,而含镍超基性岩体多表现为低阻高极化异常,因此,以高磁-低电阻率-高极化率物探异常组合为特征,可作为镍多金属矿的找矿标志。锰矿床属沉积变质型矿床,经变质作用形成硅酸锰,主要以层状蔷薇辉石为主,近地表处氧化形成氧化锰,以正磁-高电阻率-高极化率物探异常组合为特征,可很好地指示区内锰矿找矿方向。     

大功率激电测量在辽宁北水泉寻找隐伏矿床的应用

以电法勘探理论为基础,介绍了大功率激电法在辽宁北水泉地区多金属矿的应用。大功率激电中梯扫面测量,表明视电阻率高值区位于研究区中部到南及西部,断裂、构造蚀变带多集中在电阻率或极化率变化较大的地方,主要表现为低阻;硅化蚀变带依地质情况不同而不同,或为高阻、或为低阻。极化率异常基本以凝灰岩为中心,沿测区呈环状分布,钻孔验证结果东南部视极化率高值异常是由薄膜状黄铁矿引起,西北部视极化率高值异常由碳质物引起。对处在硅化带的低值异常处又有成矿地质条件的地段进行测深工作,指导钻孔的布署,在本区取得了良好的找矿成果。     

综合物探方法在五横铜多金属矿区中的运用

近年来,在五横地区周边接连发现具有一定规模的铁铜多金属矿床,本区属庐枞火山盆地的南缘,是长江中下游重要的矿集区之一。本次首先通过高精度磁测扫面工作,圈定查区磁异常范围确定主要岩体的空间分布及控矿构造带方向;再利用激发极化法圈定高极化率异常体范围,并结合可控源音频大地电磁测深法及磁异常分布特征初步建立了找矿模型：低阻高极化高磁化率模型、高阻高极化高磁化率模型。低阻高极化高磁化率异常模型是查区主要的找矿模式。     

青海南戈滩矿区地球物理特征及找矿模式

南戈滩矿区位于青海省都兰县柴达木盆地东南部,是一个与闪长玢岩有关的矽卡岩型铁多金属矿床。以闪长玢岩岩脉为中心,矿床分为南北2个矿带。矿体赋存在断裂蚀变带中,闪长玢岩脉、矽卡岩化带、矿体和断裂产出一致。对矿区不同的岩（矿）石进行了磁性和电性参数的测定和统计。统计结果表明：矿体的磁性强、极化率高、电阻率低;而围岩的磁性低、极化率低、电阻率高。矿体和围岩存在明显的物性差异,为在本区开展磁法和电法工作提供了物性前提。通过在矿区开展1∶1万磁法和激电法扫面工作,圈定了3处磁异常和1条激电异常带。在磁、电异常重合的地段布设了3条SIP频谱激电测深剖面,圈定了3个SIP极化率断面异常,异常走向NE,倾向近直立,经钻孔验证,SIP极化率异常由矿（化）体引起。SIP的电阻率异常在矿（化）体上方显示有高阻异常,这可能是矿体赋存的裂隙空间对电流排斥的结果,所以矿体上表现的电阻率异常并不一定都是低阻。以物探在南戈滩矿区具有较好的找矿效果为基础,提出了在南戈滩矿区及其外围寻找以铁为主的多金属矿床模式：首先用磁法和激电中梯进行1∶1万扫面工作,圈定磁异常和激电异常,然后在同时存在磁异常和激电异常的地表进行SIP频谱激电测深剖面测量,剖面垂直地表磁异常和激电异常测量,圈定SIP断面极化率异常,对极化率异常进行工程揭示。     

综合物化探方法在葫芦铜镍硫化物矿床勘探中的应用

介绍了葫芦铜镍多金属矿床地质及岩体特征,指出葫芦岩体控制着铜镍矿床的形成和分布,并结合多年工作经验,总结出在基性-超基性岩体中物化探高磁异常、高极化率异常、低电阻率异常、高含量元素异常相对应的结果,是寻找多金属硫化矿物的重要指示特征。同时建立了该区物化探找矿模型,为该区进一步工作开辟了新的途径。     

甘肃火石山一带铜镍找矿前景浅析

火石山地区属古老地块边缘玉石山-牛群子裂谷,构造单元内与基性-超基性岩及其有关铜镍矿化普遍,其基性杂岩体、成矿特征和黑山、怪石山铜镍矿有一定相似性,化探测量显示,基性杂岩体出露区Cu、Ni异常发育且套合较好,Ni浓集中心突显。岩体位于航磁异常梯度带,中低阻高极化特征,地物化资料表明,该区深部推测存在一分异较好,含铜镍的基性-超基性隐伏岩体,有较好的铜、镍找矿前景。     

黑龙江十五里桥金矿地球物理特征及其成矿意义

十五里桥金矿是近年来在上黑龙江盆地南缘发现的一小型岩金矿床。矿床赋矿岩石主要为硅化角砾岩,围岩为安山岩或蚀变安山岩。区内岩石物性测定结果显示,硅化角砾岩（矿石）与围岩（安山岩）的视电阻率差别较大,而与区内脉岩（闪长岩）较为接近,硅化角砾岩的视极化率略大于安山岩而小于地表氧化的青磐岩化安山岩,因此认为该区物探工作采取的电性参数应以视电阻率为主,主要寻找的目标体应呈现高阻、高极化特征。通过对区内高磁ΔT、视电阻率与视极化率等特征及异常进行分析,结合区内地质情况可以推测矿区存在多条NNE向隐伏断裂带,以高磁为主要标志,并呈低阻、中低极化特征;在NNE向高磁异常带东西两侧发育的次级NE-NEE向断裂为本区主要的容矿构造,NE与NNE向断裂交会部位金矿化显示较好,为下一步找矿提供了依据。     

综合物探方法在老矿山外围深部探矿的新成果

鉴于综合物探方法,尤其是磁法和可控源大地音频电磁法(CSAMT法)有效指导了辽西康杖子区首批深部验证钻孔施工,为进一步扩大工作区的资源储量,对有价值的C1、C2磁异常进行了再研究,采用可控源音频大地电磁法(CSAMT)对C2磁异常进行解剖,进一步确定引起磁异常的地质原因。通过综合物探方法探测成果与已有探、采资料的系统对比分析,彻底排除了康杖子C2低缓磁异常由岩体引起的可能,并推断了深部构造、岩性层位、地质体接触界线,认为高磁、高极化率,低电阻率的"两高一低"物探异常特征是隐伏矿体的赋存显示。在磁法和可控源大地音频电磁法(CSAMT法)综合成果指导下,康杖子区深部钻探工程见矿率高达95%以上,探矿成果逐年扩大,最终提交了一处中型铁钼多金属矿床,实现了肖家营子老矿区外围深部资源勘查实质性突破。     

黑龙江黑河大新屯金矿区地质特征及成因机理初探

大新屯金矿区位于多宝山一大新屯整装勘查带上,矿体产于新元古代北宽河组地层,矿体赋存于北西向断裂内;地球化学Au、Ag、As、Sb、Hg低温元素浓集中心发育,元素套合叠合程度较高,异常北西向带状展布;开展的激电中梯异常显示低阻高极化特点,极化率异常与土壤化探异常展布方向及矿体产出位置较一致,钻孔查证表明激电测深高极化率异常与矿体深部产出位置吻合。花岗质及中性闪长质岩浆的上侵为矿体的形成提供了充足的热源。由于矿脉与岩浆之间存在着较为密切的时空关系,得出矿床为老地层＋构造＋岩浆的成矿规律。     

物探方法在西峡县尹家沟石墨找矿中的应用

激电中梯测量是在矿产勘查工作中应用广泛、找矿效果良好的一种地球物理勘探方法.而石墨矿相对于围岩的物性特征主要体现为低阻和高极化,依据这一独特的物性条件,在西峡县尹家沟石墨矿普查工作中采用激电中梯测量的物探测量方法,结合地质和槽探对石墨矿体的揭露情况布设激电测深工作,进行电阻率和充电率异常提取及资料解译,通过后期钻孔验证...     

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。     

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。     

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.     

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.