青海抗得弄舍金多金属矿床金银的赋存状态研究

通过显微镜及电子探针分析手段对青海抗得弄舍金多金属矿床金矿石中金、银的赋存状态进行详细的研究。结果表明,矿石中金矿物主要为银金矿,其次为自然金,嵌布状态以粒间金为主,其次为包裹金和裂隙金;银矿物以银金矿为主,其次为自然银,部分以类质同像形式赋存于黝铜矿中;主要载金、银矿物有闪锌矿、方铅矿、黄铜矿、黝铜矿、黄铁矿、褐铁矿、重晶石、石英等。对金银赋存状态的研究为选矿工艺设计及探讨矿床成因提供了依据。     

陕西省略阳县干河坝金矿床矿石工艺矿物学研究

通过显微镜下鉴定及电子探针分析手段对陕西省略阳县干河坝金矿床金矿石中金的赋存状态进行详细的研究。结果表明,矿石中金矿物为银金矿,粒度较细,以≤0.01 mm为主,约占76.25%;嵌布状态以包裹金和粒间金为主,其次为裂隙金;矿石中主要载金矿物有黄铁矿、毒砂、石英等;矿石中银金矿粒度较细、包裹金的存在及含砷是影响选矿指标的主要因素。研究结果可为选矿工艺设计及探讨矿床成因提供依据。     

某含金原生矿石的工艺矿物学研究

某含金原生矿石的金品位为5.36×10^-6,金是主要的目标回收矿物。为了查明影响选冶工艺指标的主要因素,对该矿石开展了工艺矿物学研究。通过矿物自动分析仪,对矿石的矿物组成、矿物嵌布特征、金的赋存状态、含金矿物的粒度和含金矿物解离度进行了系统研究,获得了目标矿物的工艺矿物学相关参数。研究结果表明:该矿石中主要金矿物是自然金和银金矿;矿石中金的粒度以细粒和微细粒为主,分别占49.43%和50.57%;金矿物的赋存状态以裸露金为主,占72.71%,包裹金占27.29%。通过分析研究结果得出：提高磨矿细度,使包裹金裸露出来,同时,在浸出之前,采取相应措施对毒砂进行氧化预处理,去除毒砂在浸金过程中的不利影响,有助于提高金的回收率。     

大兴安岭北部虎拉林金矿床矿石及金矿物特征

虎拉林金矿位于额尔古纳成矿带北段,属于与斑岩体有关的隐爆角砾岩型金矿。矿石中主要的金属矿物为黄铁矿、褐铁矿和黄铜矿,同时也是主要的载金矿物;非金属矿物主要为石英和长石。矿石的主要结构为自形—半自形—他形粒状、交代和包含;矿石的主要构造为浸染状、角砾状、脉状和团块状。金矿物以自然金为主,其次为银金矿,其形态以角粒状、尖角粒状、长角粒状和麦粒状等居多,以中细粒者常见,最大粒度为0.38 mm×0.42 mm×0.06 mm。金的赋存状态以粒间金为主,其次是裂隙金和包裹金。依据矿石中金矿物粒度和赋存状态特征,建议矿石的磨矿细度选择以10 μm为宜,并可采用重选—浮选法进行选矿。     

陕西凤县马蹄沟金矿床金的赋存状态研究

马蹄沟金矿床为一典型的微细浸染型金矿床,通过显微镜观察、化学分析、能谱分析等综合分析技术对该矿床中金的赋存状态进行了详细研究。结果表明:该矿床中金主要为自然金,部分为银金矿,成色变化大(650.9~894.7);嵌布状态以硫化物包裹金为主,裂隙金、粒间金较少;载金矿物主要为黄铁矿、闪锌矿、石英、毒砂;金矿物粒度多为显微金,个别为细粒金。对金的赋存状态的研究为探讨矿床成因及选矿工艺设计提供了依据。     

青海都兰哈西哇金多金属矿床有用矿物赋存状态研究

哈西哇金多金属矿床属于构造蚀变岩型矿床。通过对矿石化学组成、矿物组成、结构构造及主要矿石的粒度、形态及嵌布关系等工艺矿物学特征进行研究,指出该矿床的矿物组成较为复杂。结果表明,矿石中金是最主要的回收矿物,辉银矿、铅矾、白铅矿、方铅矿及闪锌矿是其次可回收矿物,载金矿物以黄铁矿和毒砂为主,金矿物主要为银金矿,角粒状包裹金是金的主要赋存状态。这一研究结果为有益元素的充分利用及制定经济合理的选矿工艺流程提供了可靠的工艺矿物学依据。     

小西南岔金铜矿床金的赋存状态研究

小西南岔金铜矿床属次火山—斑岩型矿床,矿化类型主要为浸染型和硫化物方解石石英脉型。通过电子探针及显微镜下分析,结果表明,矿石中金矿物主要为自然金、银金矿;金矿物形态复杂多样,以显微金和细粒金为主;金矿物的嵌存状态以包裹金、粒间金为主。金主要富集于硫化物方解石石英脉中,在空间上金多分布在矿体中上部。     

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。     

坦桑尼亚PL7184金矿床矿石特征与金的赋存状态

PL7184金矿床位于环维多利亚湖金矿成矿区的马巴莱—布洪古基拉绿岩型金矿带上,对其矿石特征及金的赋存状态进行研究,有助于指导矿石选冶工艺及流程优化。通过野外地质观察、光薄片鉴定、电子显微镜和电子探针分析等技术方法,对该区金矿床矿石特征和金的赋存状态进行了系统研究。结果表明：金矿体主要赋存在条带状含铁建造岩层与酸性火山沉积岩层间的剪切破碎带内,区内金矿石划分为稠密浸染状黄铁矿化金矿石、稀疏浸染状黄铁矿化金矿石、细脉状黄铁矿化金矿石和含星点状黄铁矿化金矿石4种自然类型,其中稠密浸染状黄铁矿化金矿石含金性最好。金矿物的种类以银金矿为主,有少量自然金;金矿物的赋存状态以粒间金为主,其次为包裹金和裂隙金,金矿物粒度以中细粒为主,粒径多在0.01~0.07 mm之间。     

辽宁夹山金铜矿区金的赋存状态研究

辽宁夹山金铜矿区物质组分和金的赋存状态研究结果表明,矿石的主要金属矿物有黄铁矿、黄铜矿、方铅矿、闪锌矿、银金矿、自然金等,这种典型矿物组合可作为寻找和评价金矿床的找矿矿物学标志.金矿物的形态以不规则状为主,且粒度细小;金的成色平均为744.金的赋存状态有明金、显微金(裂隙金、晶隙金和包体金)和超显微金,以显微金为主,裂...     

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.