某滨海锆钛砂矿工艺矿物学研究

利用矿物解离分析仪(MLA)、能谱检测、扫描电镜、体视显微镜等分析手段,对某滨海锆钛砂矿的化学组成、粒度组成、有价矿物的选矿工艺特性等进行了详细研究。结果表明：矿砂中有价矿物种类较多,主要有钛铁矿、锆石、金红石和含铁金红石、独居石等。由于有价矿物种类多,物理性质复杂,精选分离具有一定的难度;矿砂中砂粒粒度主要在0.10~0.50mm之间,有价矿物的粒度小于0.32mm,呈细粒分布,具有粒度大小均匀,粒度范围较窄的特点。此研究结果为该砂矿资源的选矿方案提供了依据。     

A Sense of Purpose: Mathematics and Performance in Environmental Design

Mathematics in design is most often associated with its visual manifestation in geometrical surfaces and elements. The finely tuned ambient qualities of a space, necessary for environmental performance, may not be so apparent, but can involve the application of many branches of mathematics. Martha Tsigkari, Adam Davis and Francis Aish of Foster + Partners' Specialist Modelling Group bring this to the fore by describing how at Al Raha Beach development in Abu Dhabi and the City of Justice in Madrid environmental considerations were interpreted through analytical numerical data. Copyright © 2011 John Wiley & Sons, Ltd.     

Escherichia coli toxin and attachment genes in sand at Great Lakes recreational beaches

The United States Environmental Protection Agency recommends density thresholds for the fecal indicator organism Escherichia coli in order to ensure the safety of recreational waters. A number of studies published over the past ten years indicate that E. coli is encountered frequently in sand at recreational beaches. While a majority of the sand-associated E. coli may be commensal or environmental strains, the potential for pathogenic strains of E. coli to be present exists. Therefore, the aim of this study was to assess the presence of attachment and virulence genes associated with enteropathogenic and enterohemorrhagic strains of E. coli (EPEC and EHEC) in populations of E. coli recovered from swash zone sand from seven recreational beaches along Lake Huron and Lake St. Clair in eastern Michigan, USA. Genes coding for attachment proteins in EPEC and EHEC were very prevalent in sand E. coli, but genes coding for toxin genes were uncommon. The paucity of genes associated with E. coli toxins suggests that the EPEC and EHEC pathotypes are not common in sand; however, the high prevalence of genes associated with attachment in E. coli pathotypes suggests that these genes are being retained within the beach sand E. coli population.     

八面河油田西区沙四段滩坝砂体分布规律

滩坝砂体储层薄,横向变化快,常规方法预测难度大。通过沉积旋回、古湖岸线(隆起)走向、宏观及微观古地形来预测滩坝主体的发育位置。     

江苏省水晶矿床成因分析

通过对江苏东海区域成矿地质条件以及含晶石英脉成群成带分布规律的研究,得出以下结论:①该区水晶矿床为原生矿、砂矿两种类型;②水晶原生矿形成于前震旦纪以后到白垩纪以前的高、中温热液期;③矿体具分布广、规模小、分布散等特点;④东海水晶储量丰富、品位极高、埋藏浅,具有很好的开发利用前景。研究成果旨在为该区域水晶矿进一步的勘探、开发及利用提供重要依据。     

Composite Analysis for Escherichia coli at Coastal Beaches

At some coastal beaches, concentrations of fecal-indicator bacteria can differ substantially between multiple points at the same beach at the same time. Because of this spatial variability, the recreational water quality at beaches is sometimes determined by stratifying a beach into several areas and collecting a sample from each area to analyze for the concentration of fecal-indicator bacteria. The average concentration of bacteria from those points is often used to compare to the recreational standard for advisory postings. Alternatively, if funds are limited, a single sample is collected to represent the beach. Compositing the samples collected from each section of the beach may yield equally accurate data as averaging concentrations from multiple points, at a reduced cost. In the study described herein, water samples were collected at multiple points from three Lake Erie beaches and analyzed for Escherichia coli on modified mTEC agar (EPA Method 1603). From the multiple-point samples, a composite sample (n =116) was formed at each beach by combining equal aliquots of well-mixed water from each point. Results from this study indicate that E. coli concentrations from the arithmetic average of multiple-point samples and from composited samples are not significantly different (t = 1.59, p = 0.1139) and yield similar measures of recreational water quality; additionally, composite samples could result in a significant cost savings.     

新型便携式选金机组的研究

针对我国砂金矿"小而分散,贫而细"的实际特点,本文提出了一种新型便携式选金机组.经试验表明,该设备运行可靠、操作简单、能耗低、投资少、选别效率高,特别适合小规模砂金矿开采使用.     

云南某砂钛矿选矿试验研究

通过对云南某砂钛矿的性质及其相关研究,认为强磁-磨矿-弱磁-重选是处理该矿石的有效工艺.试验表明:该工艺选矿指标较好,能够得到钛品位和回收率分别为47.58%和52.00%的钛精矿,铁品位和回收率分别为57.50%和10%的铁精矿.     

辽河滩海地区的生排烃数值模拟

辽河滩海地区西起葫芦岛,东至鲅鱼圈连线以北,沙河街组三段和一段分别为该区的主力烃源岩和储层.根据本区的地质、地球物理及地球化学资料,参考邻区的部分参数及专家意见,进行的生、排烃模拟结果表明,模拟区内主力生烃层为沙河街组三段,次为沙河街组一二段,平面上以盖州滩洼陷、海南洼陷和清水洼陷为主要生烃中心,以海南次洼和锦州9-3南次洼为次要生烃中心.模拟区的东部凹陷生油兼生气,西部凹陷以生油为主,东营组时期进入生烃高峰.排烃高峰期始于东营组一二期.一直持续至今,排油中心与生烃中心吻合,但排气强度略有区别,东部凹陷的排气强度高于西部凹陷.     

红河流域(云南段)砂金成因类型及其找矿前景

根据成矿作用、成矿环境及矿床特征,红河流域(云南段)砂金矿床可分为残坡积、洪积、冲洪积和冲积4种类型。成矿主要受基底含金地质体、地貌、气候、断层河系及水化学环境等综合控制,哀牢山西侧南段元阳、金平一带最具找矿前景。