广西昭平黄胆冲地区金多金属矿床土壤地球化学研究与找矿

通过在黄胆冲地区开展1:1万土壤剖面地球化学测量工作,总结了矿区出露的地层、岩性、构造等地质特征,在此基础上,运用土壤地球化学方法进行找矿研究,得出以下认识:元素参数统计显示,Au、Ag、As、Cu、Pb、Mo、Mn、Co元素含量比较高,变化系数比较大,易次生富集形成地球化学异常;因子分析、聚类分析、相关分析等多元统计...     

海南岛东西部砖红壤中重金属元素含量空间分布特征及其相关性研究

[目的]对海南岛东西部砖红壤中重金属元素含量空间分布特征及其相关性进行研究.[方法]采用现场采样及室内分析测试的方法,在海南岛东、西部各取6个土壤剖面,共35个土壤样本,对砖红壤土壤剖面中7种重金属元素的含量特征进行分析,研究不同地区砖红壤剖面重金属元素含量的空间分布特征,并分析东、西部表层土壤各种重金属之间的相关性.[结果]土壤中重金属元素含量及其分布规律从很大程度上取决于土壤母质的特征;除镍元素外,大部分重金属元素在各层中的均值高于中国南方砖红壤平均值,有一部分重金属元素在淀积层积累;另外,人类活动对海南岛砖红壤剖面中的重金属元素可产生一定影响;海南东、西部表层土壤各种重金属之间的相关性分析结果表明,铅和铜,铬和镍,铬和锌之间显著相关,这些重金属来自同源的概率更大.[结论]该研究结果为海南岛砖红壤重金属污染风险评估奠定了基础.     

甘肃礼县白家沟一带金矿土壤地球化学异常特征及评价

礼县白家沟一带横跨中秦岭陆缘盆地Ⅲ级构造单元,地处临潭-徽县Pb-Zn-Cu(Fe)-Au-Hg-Sb-Ag-Mo-W-SnⅣ成矿亚带。本文通过1:10000土壤地球化学测量,统计了研究区Au、As、Sb等12种元素的含量特征、分布特征、组合特征及等,并圈定了3处以Au、As、Sb为主的综合异常。初步认为研究区Au、As、Sb等元素找矿潜力较大;根据异常特征和成矿地质条件分析,可知异常分布在区域金主要赋矿地层-中上泥盆统西汉水群双狼沟组内,主要受地层和构造控制,其成矿类型主要为低温热液型;通过初步异常检查发现Au异常主要为矿致异常,发现2条金矿体3条金矿(化)体。     

新疆且末乌鲁克土壤地球化学特征

新疆且末乌鲁克地区土壤地球化学调查是在距地表20cm～50cm深处土壤的B层(淋积层)或C层(母质层)中采集细粒级物质,按线距100m、点距40m的间隔取样。测试分析Au、Sn、Ag、As、Co、Cu、Zn、Mo、W、Pb等10种元素在调查区内的含量。在统计这些土壤地球化学特征参数的基础上,与该地区元素背景值进行比对分析,计算出调查区内土壤元素的富集程度,认为该调查区表层土壤中Cu、Au元素明显富集,有望在调查区内找到铜金多金属矿。     

浅析福建柘荣太子参产区土壤地球化学特征

通过对柘荣太子参产区的120个表层土壤样点进行分析测试,根统计土壤地球化学参数,应用数理统计、相关性分析对土壤地球化学特征进行评价,应用污染指数评价法对土壤环境质量进行评价。研究区内土壤总体呈酸性,有机质含量较高;Mn、N、P、Ca、Mo、Se、Cu全量与其有效态含量有较好的正相关性;土壤质量优良,满足土壤环境质量二级标准,符合绿色农业发展要求。     

某铅锌矿区土壤重金属污染分析

分析检测了某铅锌矿区水、土壤、尾矿、废石等样品重金属元素含量,追踪调查了尾矿库、排土场下游土壤重金属污染程度和分布范围,并对重金属元素相关性进行了研究。结果表明:铅锌矿区土壤环境质量总体较差,铅锌矿区重金属污染集中分布在尾矿库和排土场下游地块;铅锌矿区主要污染元素为Cd、Cu、Pb、Zn、As,污染程度以轻度-中度污染为主;尾矿库下游重金属元素Cu、Pb、Zn、As污染分布在1 600m内;排土场重金属污染范围主要集中在下游400m内。土壤样品Cu、Pb、Zn与As、Cd元素呈显著正相关性,Cu、Pb、Zn、As、Cd元素来自同一源头,可能源自尾矿、废石等固体废物;Hg、Cr、Ni元素来自另一源头,与矿业活动无关。     

土壤中有效氮、磷、钾测定方法相关性研究

本文通过实验,运用常规方法和速效方法来测定土壤中的有效氮、磷、钾等元素含量,并将两种测定方法结果对比分析,通过作图法来得出两者之间的相关性。     

黑龙江省黑河市伊洛特河地区水系沉积物异常特征及找矿效果

在黑河市伊洛特河地区开展1∶5万水系沉积物测量的基础上,对样品分析结果进行统计,结合地质背景,对11种元素含量分布特征、相关性及组合异常特征的总结发现:Au、Ag、Mo等元素发生了不同程度的富集,具有形成该类矿床的可能。圈定了水系沉积物组合异常42处,通过分析元素相关性、成矿地质背景,认为组合异常HS-10、HS-36、HS-37具有较好找矿潜力。针对组合异常HS-37开展了1∶2万土壤测量和地表工程验证,在Au元素异常浓集中心发现了金矿体,最高品位1.26×10^-6,最大宽度3.0 m。表明1∶5万水系沉积物测量在与伊洛特河地区相似的植被覆盖严重地区的找矿勘查中具有良好的应用价值。     

甘肃岷县里沟金矿区土壤异常特征及找矿预测

甘肃岷县里沟金矿区位于西秦岭造山带西部,属鹿儿坝-崖湾金、汞、锑成矿带。含矿地层为中三叠统古浪堤组。通过对该金矿区进行土壤地球化学测量,对12项元素进行相关性分析、因子分析等研究,认为测区具有较好的找矿前景,Au是测区主成矿元素,Sb、As、Hg、Ag、W是主要成矿指示元素,Cu、Pb、Zn、Bi为主要成矿伴生元素,具有中低温热液成矿特征。通过勘查区土壤元素分布特征和成矿潜力等综合分析,提出找矿预测区4处,其中A级找矿预测区2处,B级找矿预测区2处,为后续矿区勘查提供了化探依据。     

20MnSi钢连铸方坯的原位统计分布分析

连铸方坯生产过程中由于连铸工艺参数的不合理会出现元素的偏析现象,严重的会导致裂纹或缩孔等缺陷的产生。选取存在明显纵向裂纹的20MnSi钢连铸方坯试样进行原位统计分布分析,实验表明裂纹的存在会导致元素含量的原位统计结果异常,从而影响元素含量统计分布分析。通过OPA-200软件的裁剪功能对异常数据进行处理是一种可行的处理方法。对20MnSi钢连铸方坯整个横截面进行原位统计分布分析, C、Si、Mn、P、S元素含量的二维等高图显示在中心区域以及距横截面边部1/4处元素存在富集的情况,通过统计偏析度定量分析表明,C、P、S元素的偏析情况较为严重,而Si、Mn元素的偏析不太严重。此外,通过在方坯横截面横向中心线位置进行钻孔取样分析C、P、S元素的含量,验证了传统偏析分析方法与原位统计分布分析技术的一致性。     

Benzimidazole resistance in cyathostomes in horses in the Ukraine

The efficacy of treatment with cambendazole was tested in 1-year-old horses on a farm in Dubrovka, Ukraine. Thirty-five horses were treated. Their egg output was compared on the day of treatment and 14 days later with that of 33 untreated horses. Before treatment the mean number of eggs g-1 faeces was 614 in the controls and 766 in horses that had been treated. After 14 days the mean egg output in the controls was 580 and in the treated horses 369. This means a reduction of 54.5%. Only cyathostome larvae could be cultured from faeces collected after treatment. It can be concluded that benzimidazole resistance in cyathostomes is present in the Ukraine.     

重庆高校推进产学研合作的案例分析

以重庆大学、重庆邮电大学和重庆理工大学为例,剖析重庆高校推进产学研合作的基本模式,已经取得的突出成绩,分析总结其基本经验.从完善政策法规体系、强化经济调控、建立组织机构、加强中介建设及开展国际产学研合作等方面,提出了深入推进重庆高校产学研合作的对策建议.     

Fractures in childhood in Khartoum

A prospective study of fractures in 231 children received at Khartoum North Teaching Hospital(KNTH) was carried out for a period of six months. The incidence of child fracture rated as one per day, then it increased from the age of 5 years onwards in boys and between 6 and 8 years in girls. Most injuries were sustained during the day time, especially between late afternoon and sunset. 82% of injured children presented to a medical facility, while 18% were taken to native healers first. Non-road traffic accidents accounted for 84% of the fractures mainly due to sports, domestic injuries and falls; whereas road traffic accidents were 16% and occurred mainly in pedestrians. Forty three percent of the fractures needed only first aid and splintage while 42% needed closed reduction. Thirty one percent of all patients were treated as inpatients. The long bones were affected in 91% of all fractures, the commonest site being the distal end of the forearm (26%), followed by supracondylar fracture of the humerus (15.6%). In the upper limb, left-sided fractures predominated. The epiphyseal injuries were 3.5% of all fractures, mainly at the distal radial epiphysis. Boys were commonly affected between 13-15 years of age. Open fractures constituted 9.8% of the series and were mainly due to traffic accidents in town dwellers, the most vulnerable bones were those of the leg and foot. Pathological fractures accounted for 2.2% and were due to bone cysts and osteogenesis imperfecta. The problem of child safety and the preventive measures need to be more stressed.     

Apoptosis in experimental myocardial infarction in situ and in the perfused heart in vitro

We report the appearance of apoptotic cells in experimental myocardial infarction (rabbit heart) in in situ and in vitro preparations. Apoptosis was recognized by intravital staining with Hoechst 33342 (Ho342), by nick-end labeling (TUNEL) and by DNA laddering. A steady rise in the relative number of apoptotic cardiomyocytes (apoptotic index) was noted in in situ preparations. Apoptosis was first noted 6 h after the onset of ischemia with its highest value occurring after 72 h. Apoptotic nuclei were absent in remote areas of the left and right ventricles. Apoptotic nuclei within the infarcted area showed diminished intensity of Ho342 fluorescence. Three days after ischemia, a border zone adjacent to the infarcted area consisting of apoptotic macrophages was recognized. A novel finding was the appearance of apoptotic cardiomyocytes in the isolated perfused ischemic heart. Occurring as early as 50 min after the onset of ischemia, a high apoptotic index was present adjacent to the ligature placed around the coronary artery. This observation provides the opportunity to selectively examine factors leading to apoptosis in the ischemic heart under controlled experimental conditions.     

Problems in falling in love

Certain patients enter psychoanalysis because of their inability to love another person. Often they report a repetitive erotic pursuit of desired partners, without being able to experience or maintain loving feelings. Kernberg has understood such difficulties as representing effects of early narcissistic disappointments and/or of difficulties in resolving oedipal conflicts. In this paper, Lacanian concepts of the mirror phase and symbolic love are employed to develop these issues. Sexualization of problems in mirroring may be fused with oedipal conflicts in some cases. An extended vignette is presented to illustrate the technical and theoretical issues.