某高硫铜硫矿工艺矿物学研究

研究了某高硫铜硫矿的工艺矿物学。结果表明,原矿中铜品位为2.85%,硫品位为24.32%,金含量为0.48g/t,铜、硫、金是主要回收的元素。原矿中的金属矿物有黄铜矿、黄铁矿、蓝辉铜矿。目的矿物黄铜矿和黄铁矿的嵌布粒度差异较大,且铜矿单体解离度相对较差。在选择工艺流程时应该注重氧化铜矿物的回收,同时要选择合适的磨矿细度,保证目的矿物单体解离。     

辉钼矿工艺矿物学特征与选矿指标关系研究

在选矿试验研究的基础上,结合对蚀变岩、花岗岩及石英脉等类型辉钼矿的工艺矿物学特征考察,分析了矿石类型、嵌布特征和矿粒粒度等与其选矿指标的关系。研究表明,辉钼矿的选矿指标与其矿粒粒度关系密切,随着辉钼矿矿粒面积累计含量的增加,其选矿指标提高明显。本研究的开展,将为全面开展典型矿产资源工艺矿物学特征调查,运用现代测试分析技术(如MLA等),快速分析矿物嵌布粒度、分布状态等矿石特征,研究总结其与选矿工艺指标关系,建立矿产资源节约与综合利用评价指标体系,实现矿产资源合理开发利用评价,为促进矿产资源节约与综合利用管理奠定基础。     

Location‐based distributed caching for device‐to‐device communications underlaying cellular networks

Device‐to‐device (D2D) communications have been viewed as a promising data offloading solution in cellular networks because of the explosive growth of multimedia applications. Because of the nature of distributed device location, distributed caching becomes an important function of D2D communications. By taking advantage of the caching capacity of the device, in this work, we explore the device storage and file frequent reuse to realize distributed content dissemination, that is, storing contents in mobile devices (named helpers). Specifically, we first investigate the average and lower bound of helper amount by dividing the network into small areas where the nodes are within each other's communication radius. Then, optimal helper amount is derived based on average helper amount and network topology. Subsequently, a location‐based distributed helper selection scheme for distributed caching is proposed based on the given optimal helper amount. In particular, nodes are selected as helpers according to their locations and degrees, and contents are placed in the manner for maximizing total user utility. Extensive simulation results demonstrate the factors that affect the optimal helper amount and the total user utility. Copyright © 2015 John Wiley & Sons, Ltd.     

Current Awareness Using PubMed

ABSTRACT

Current awareness is something that librarians do, at least informally, passing on relevant current information to their patrons on a regular basis. The type of current awareness service considered here entails running preselected searches against electronic databases. The availability of these electronic bibliographic databases allows automating much of the current awareness process. Any successful current awareness service will have three key attributes: speed, ease of use, and relevance. The flexibility and accessibility of the National Library of Medicine's PubMed make it ideal as the basis for a current awareness service. Six freely available services are evaluated according to uniform criteria with notes made of special features. Four services use PubMed as the source for data, and the other two use MEDLINE. Recommendations are made for modifying one of the services to embody the key attributes of a successful service. Particular attention is given to local needs. Such a service can be run from a single desktop machine with a dial-up connection to the Internet.     

Optimizing social media message dissemination problem for emergency communication

Social media is increasingly being used as a communication bridge between government, emergency responders and managers, and the general public in extreme events. Passing information through social media channels enables individuals to send and receive content in real-time and without limitation of location and geography. While the use of social media in extreme event situations has become prevalent, there is often little strategy involved in message dissemination and too little understanding of the effects that underlying online social networks have on message distribution. In this study, we introduce a formal model for social media message dissemination in social networks through time. Our proposed model includes emphasis on single and multiple message scenarios and examines key communication characteristics in the development of more intentional and targeted social messaging strategies. We present a detailed experimental design on randomly generated networks and real-world sub-networks of the Twitter social graph and discuss our findings. We also include a Tabu Search procedure for solving single-message problem and discuss its potential value for large-scale problems in real-world applications.     

朝鲜某复杂难选钽铌锆矿选矿试验研究

针对朝鲜某大型碱性花岗岩型钽铌锆矿床矿石化学成分复杂，有用矿物嵌布粒度细，有用矿物之间以及与脉石矿物之间解离性差的特点，采用细磨-脱泥-钽铌锆混合浮选流程处理该矿石，在原矿Nb₂O₅、ZrO₂、Ta₂O₅品位分别为1.17%、3.12%、0.046%情况下，最终可获得Nb₂O₅、ZrO₂、Ta₂O₅品位分别为9.43%、24.95%、0.36%，回收率分别为77.37%、76.77%、75.13%的钽铌锆混合精矿。     

陕西楠木树铅锌矿工艺矿物学研究

陕西楠木树地区氧化铅锌矿资源十分丰富,利用好这部分资源对陕西的铅锌矿产业有极大的现实意义.对陕西楠木树氧化铅锌矿石进行了工艺矿物学研究.利用多种分析检测手段对矿石的化学成分、矿物组成、菱锌矿粒度以及矿石的结构等进行了详细研究.陕西楠木树氧化铅锌矿石中有用矿物以菱锌矿、闪锌矿、方铅矿为主,少量硅锌矿、黄铁矿等.脉石主要为白云石、石英.矿石类型以氧化矿为主,矿石构造较为复杂.为陕西楠木树氧化铅锌矿选矿工艺的选择和开发提供了理论数据.     

Bacterial communication systems: A mathematical formulation of negative chemotaxis

The emergence of molecular communication (MC) has provided a new paradigm for communication at nanoscale, besides the electromagnetic one. Numerous biological systems have been proposed that could be used for communication, using mostly bacteria as information carriers, ensuring biocompatibility and low complexity requirements. In this work, message dissemination dynamics in a bacterial communication system was under investigation by means of a simulation framework that was designed and developed based on a commercial tool. A mathematical formulation is proposed, in an effort to accurately predict the system's behavior under the presence of chemotactic‐like nodes. Simulation results are in strong agreement with the respective mathematical model, for a wide range of biological processes, including phenomena such as chemotaxis, bacterial growth cycle, and biological message transformation dynamics. In the case of a simple simulation scenario exhibiting chemotaxis, the mean accuracy improvement reaches values of up to 19% .     

微细粒嵌布钛铁矿石选矿工艺研究

针对云南某钛铁矿石嵌布粒度较细，与脉石的连生的关系复杂的特性进行了详细的试验研究，采用了粗选抛尾、粗精矿再精选的工艺流程选别该矿石，获得了较好的选矿指标。