南方某铀矿提铀工艺发展

介绍南方某高含泥铀矿提U工艺发展过程.初期矿石经简单破碎后采用粗放型堆浸,效果不理想;经研究采用破碎分级粉矿酸性造粒堆浸,从根本上解决了该矿石渗透性差,不能直接堆浸的难题,酸性造粒有独到之处,铀浸出效果好;由于该工艺复杂、作业劳动强度大、卫生条件差,也受天气影响生产等问题,因而又研究出了粉矿和精矿搅拌浸出、粗粒堆浸的组合工艺,提高了提铀的工艺水平和效益.     

海水围塘养殖生态系统氮磷负荷的研究

通过对连云港市宋庄镇有机海水养殖基地围塘海水氮磷污染负荷的实验分析、比较和验证研究,提出了新的计算N、P污染负荷的方法—＂新化学分析法＂。研究表明,新化学分析法的计算结果更符合实际情况,且围塘海水养殖1公顷面积1个养殖周期的污染负荷分别为：混养组,氮42.1kg,磷10.01kg;单养组,氮85.4kg,磷20.6kg;同时证明海水混合养殖较单一养殖更能提高海水围塘生态系统的物质转换效率,减少环境污染。     

洪水工况下尾矿库浸润线变化规律及稳定性分析

秧田箐尾矿库为铜厂铜矿规划新建的尾矿库。在规划设计期间,利用室内堆坝模型试验,演绎尾矿库堆坝过程的同时,研究了该尾矿库堆积到设计总坝高约2/3的高度(120m)时,在洪水工况和正常工况下坝体浸润线的变化规律。并以试验数据为基础,采用Slide5.0软件对尾矿坝在这一高度下的稳定性进行了计算,获得了尾矿坝在不同工况下的稳定性结果,为后期继续进行试验和未来矿山安全生产服务。结果显示,坝体在正常状态下稳定系数满足规范要求,但洪水状态下稳定系数小于国家规范值,需要对原始初步设计进行调整或采取其他措施,确保尾矿库安全。     

跨文化交际中拉近面子距离的策略研究

面子可解释语言使用中的礼貌现象,而不同文化的差异导致面子维护在跨文化交际中难以实现。文章通过分析面子在中西方文化中不同的文化根源,总结面子维护理论并提出可行的拉近面子距离的策略,从而更有效地进行跨文化交际。     

Aspects of palaeosols in Australia

Numerous examples of long term landscape are presented relating soil and regolith to landforms going back to Cenozoic or Mesozoic times. Many conventional approaches to soil are inappropriate for such materials. It is important to study the entire regolith, and realise it seldom reveals all the changes of climate ithas experienced.     

我国沙滩排球教练员队伍现状调查与分析

通过文献资料法、专家访谈法、问卷调查法、数理统计法对参加“山东体彩杯”2008年全国沙滩排球冠军赛的部分教练员进行了调查和分析，得出以下结论：我国沙滩排球教练员年龄结构基本合理，学历水平较高，训练计划的制定具有一定的科学性，但职称较低，都曾经是室内排球运动员，执教年限短，执教经验欠缺，训练方法和手段缺乏创新，参加培训次数少，并针对所存在的问题提出了相应的对策，以期对我国沙滩排球教练员队伍的发展提供理论支持。     

硬材原木不对称下锯图最佳开锯面位置预测

本研究表明，对仅有一块锯材比其余板厚小的不对称不锯图，应用对中法来估计ＢＯＦ位置，是个可行的选择。     

The diets of juvenile horseshoe crabs,Tachypleus tridentatus and Carcinoscorpius rotundicauda (Xiphosura), from nursery beaches proposed for conservation in Hong Kong

Once common as a fishery resource, adult horseshoe crabs of two species occur in Hong Kong. A third, Tachypleus gigas, can no longer be found. Once common too were breeding and nursery beaches for horseshoe crabs in Hong Kong but overfishing of adults, pollution and coastal reclamation have reduced these to but three identified sandy mudflats and only one where juvenile Tachypleus tridentatus and Carcinoscorpius rotundicauda are sympatric. Nothing is known, however, of the conservation requirements of these two species locally and this study of the diets of these juvenile horseshoe crabs on two such nursery beaches aimed at providing information on this most elementary aspect of their biology. Gut contents of juvenile horseshoe crabs, i.e. nine Tachypleus tridentatus (8.5–67?mm prosoma width) and two Carcinoscorpius rotundicauda (50 and 52?mm prosoma width), were analysed and compared with the composition of the ambient assemblage of meiobenthos on a nursery beach at Pak Nai, Hong Kong. The obtained data suggest that juvenile horseshoe crabs of both species are selective benthic feeders and subsist mainly on insect larvae, polychaetes, oligochaetes, small crabs and thin-shelled bivalves. A strong, positive, preference for insect larvae (Chironomous sp.: Diptera: Chironomidae) was recorded, but with no preference for meiofauna over macrofauna.     

氧化塘污水对甜菜生理学影响的研究

本实验用氧化塘经生物氧化处理后的污水浇灌甜菜,研究甜菜苗期叶绿素、可溶性糖和生长素等变化规律,为综合利用城市污水提供参考.     

大屏幕彩色证券显示屏的结构设计及工艺

本文阐述了大屏幕彩色证券显示屏的结构设计及工艺.这种显示屏是电子、机械结构设计与工业设计的有机结合.