弧齿式与锯齿式接链环的比较

分析了锯齿式接链环结构的不合理性和其换代产品弧齿式接链环结构的合理性,并对两者的技术性能、使用寿命等进行了比较分析,认为弧齿式接链环具有较高的破断强度和疲劳强度,是目前井下使用的接链环更新换代的最佳产品。     

浅谈人事风险及其监控和防范

论述了人事风险是组织内人员的行为违背客观规律、偏离组织目标,给组织造成损失或损害;造成企业非正常损耗有形资产;干扰和破坏总体战略;损害企业信誉;降低配置效率;阻碍组织发展。很多企业把注意力集中在对付经营风险和财务风险上。人事风险具有较大的隐蔽性和突发性。应该通过各种措施来防范人事风险。     

声发射测量原岩应力研究现状及进展

综述了声发射测量原岩应力的国内外研究现状和目前所存在的主要问题，结合信号处理小波分析方法的研究成果，说明了将小波分析引入到原岩应力测量的重要性，最后提出了基于小波分析的综合研究方法作为声发射测量原岩应力的进一步研究方向。     

从铅锌矿石中综合回收银,镉,铁选矿工艺研究

对某铅锌矿石采用优先浮选—磁选的工艺流程，分别获得了合格银精矿、含镉和银的锌精矿及合格的铁精矿，银、锌、镉、铁的回收率依次为８９．７５％、９２．３１％、８９．１０％、６６．４３％。     

可门电厂烟气脱硫吸收塔结构计算分析

通过有限元方法,对可门电厂烟气脱硫吸收塔进行结构计算分析。首先得到了塔体的振型、周期等自振特性,然后分析了塔体以及主要构件在各种荷载作用下的应力和变形,最后讨论了吸收塔塔体、构件及设计构造等。文中方法与结果可为类似工程借鉴。     

盘石岭隧道开挖和支护的施工要点

盘石岭隧道为典型的浅埋软弱围岩隧道，岩层节理发育且距进口处有后断层带，于洞身成斜交，施工中，首先采用抗滑桩施工稳定山体，洞身采用中隔法和喷锚混凝土，钢架支撑、注浆锚杆等初期支护，有效地防止了山体滑移，成功地通过了破碎带。介绍了其施工工艺及施工方案，并针对以上一些问题作了分析。     

Geochemistry of some rare earth elements in groundwater,Vierlingsbeek, The Netherlands

Groundwater samples were taken from seven bore holes at depths ranging from 2 to 41m nearby drinking water pumping station Vierlingsbeek, The Netherlands and analysed for Y, La, Ce, Pr, Nd, Sm and Eu. Shale-normalized patterns were generally flat and showed that the observed rare earth elements (REE) were probably of natural origin. In the shallow groundwaters the REEs were light REE (LREE) enriched, probably caused by binding of LREEs to colloids. To improve understanding of the behaviour of the REE, two approaches were used: calculations of the speciation and a statistical approach.For the speciation calculations, complexation and precipitation reactions including inorganic and dissolved organic carbon (DOC) compounds, were taken into account. The REE speciation showed REE(3+), REE(SO(4))(+), REE(CO(3))(+) and REE(DOC) being the major species. Dissolution of pure REE precipitates and REE-enriched solid phases did not account for the observed REEs in groundwater. Regulation of REE concentrations by adsorption-desorption processes to Fe(III)(OH)(3) and Al(OH)(3) minerals, which were calculated to be present in nearly all groundwaters, is a probable explanation.The statistical approach (multiple linear regression) showed that pH is by far the most significant groundwater characteristic which contributes to the variation in REE concentrations. Also DOC, SO(4), Fe and Al contributed significantly, although to a much lesser extent, to the variation in REE concentrations. This is in line with the calculated REE-species in solution and REE-adsorption to iron and aluminium (hydr)oxides. Regression equations including only pH, were derived to predict REE concentrations in groundwater. External validation showed that these regression equations were reasonably successful to predict REE concentrations of groundwater of another drinking water pumping station in quite different region of The Netherlands.     

走近辽都——巴林左旗林东镇

掀开历史的画卷,辽都故地巴林左旗是一片神奇的土地。它位于内蒙古自治区赤峰市北部大兴安岭南段山麓南端,总面积6458.86平方公里。全旗共辖6个镇、10个乡、3个苏木,156个村委员会,547年自然村,总人口36万人口。旗政府所在地林东旗距赤峰市区272公里。全境属温带大陆性季风气候区。全旗土地总面积968.8290万亩,现有耕地147万亩,林地面积305万亩,森林覆盖率达30.7%。凭借丰富的林木资源,推动木材加工业的发展壮大,使之成为农牧民增收的重要渠道。全旗现有草牧场面积484万亩,为畜牧业的发展提供了充足的饲草资源,年产优质绵羊毛230吨、山羊绒1…     

水景住区设计的新构想——“衡水天元—怡水花园水景公寓”项目设计

通过回顾衡水天元—怡水花园水景公寓设计过程,表述了尊重自然、因地制宜的设计理念,把建筑与环境融合,凸显了滨水住区的特色,营造了高品质的人居环境。     

A novel application of TPAD-MBR system to the pilot treatment of chemical synthesis-based pharmaceutical wastewater

A pilot-scale test was conducted with a two-phase anaerobic digestion (TPAD) system and a subsequential membrane bioreactor (MBR) treating chemical synthesis-based pharmaceutical wastewater. The TPAD system comprised a continuous stirred tank reactor (CSTR) and an upflow anaerobic sludge blanket-anaerobic filter (UASBAF), working as the acidogenic and methanogenic phases, respectively. The wastewater was high in COD, varying daily between 5789 and 58,792 mg L(-1), with a wide range of pH from 4.3 to 7.2. The wastewater was pumped at a fixed flow rate of 1m(3)h(-1) through the CSTR, the UASBAF and the MBR in series, resulting in respective HRTs of 12, 55 and 5h. Almost all the COD was removed by the TPAD-MBR system, leaving a COD of around 40 mg L(-1) in the MBR effluent. The pH of the MBR effluent was found in a narrow range of 6.8-7.6, indicating that the MBR effluent can be directly discharged into natural waters. A model, built on the back propagation neural network (BPNN) theory and linear regression techniques, was developed for the simulation of TPAD-MBR system performance in the biodegradation of chemical synthesis-based pharmaceutical wastewater. The model well fitted the laboratory data, and was able to simulate the removal of COD.