超滤-纳滤组合工艺对东太湖原水的处理效果

随着工业化进程的不断加快,东太湖水质日趋恶化,给常规处理增加了很大的处理难度。针对水源污染问题和给水深度处理的需要,开展了超滤-纳滤双膜组合工艺处理东太湖原水的中试研究,考察双膜工艺对出水水质的提升效果。结果表明,超滤-纳滤双膜工艺对水质常规指标具有较好的去除效果,CODMn和TOC的去除率分别为91.7%和90%;对荧光类物质的去除主要表现在对芳香族蛋白质、类富里酸物质、溶解性微生物代谢产物的去除;此外,双膜组合工艺对小分子二甲基异莰醇(2-MIB)和土臭素(GSM)的去除率分别为70%和77%,表明该工艺对水中主要致嗅物质具有良好的去除能力。     

Commercial farmers’ strategies to control water resources in South Africa: an empirical view of reform

This article shows how large-scale commercial farmers, individually and collectively, are responding to land and water reform processes in the Thukela River basin, KwaZulu-Natal, South Africa. With a high degree of innovative agency, commercial farmers have effectively executed four strategies, enabling them to adapt and use their access to resources to neutralize multiple water reform efforts that once promised to be catalysts for inclusive change in the post-apartheid era. It is likely that policy alone will not facilitate the envisioned transformation, if local practices are not sufficiently understood and anticipated by the governmental officials charged with the implementation of water reform processes.     

Isolation and identification of phosphate‐solubilizing microorganisms and distribution of orthophosphate in different seasons from sewage‐fed East Kolkata Wetland

This study focused on isolation and identification of possible phosphate‐solubilizing bacteria (PSB ) from the sewage‐fed East Kolkata Wetland (EKWL ), a prospective water resource for pisciculture. In addition, different limnological parameters have been correlated with orthophosphate and seasonal variations. PSB have been isolated in Pikovskaya medium and identified morphologically and biochemically and finally analysed by 16S rDNA gene sequence. Limnological studies involving temperature (potentiometric), pH (potentiometric), dissolved oxygen (iodometric), ammonia‐nitrogen (spectrophotometric) and orthophosphate (spectrophotometric) concentrations were conducted. The results of this study established the presence of Bacillus megaterium , a potential PSB in EKWL . The activity of B. megaterium is also supported by the seasonal orthophosphate variations. The changes in concentration of other limnological parameters were also prominent. The water quality parameters of temperature (r  = 0.886), dissolved oxygen (r  = 0.729) and ammonia‐nitrogen (r  = 0.396) concentrations exhibited a positive correlation with orthophosphate and a negative correlation with pH (r  = ?0.699). The B. megaterium obtained in this study, exhibited a significant alteration in regard to orthophosphate content and relationships with other factors. Further experiment on the soluble phosphorus solubilization potential of B. megaterium revealed the biological availability of phosphorus was increased by threefold after 120 hr of incubation, with the decreasing pH value, although the phytase activity was 0.419 U/ml. PSB have a vital function in plant nutrition in supplying phosphate, essential nutrients and its uptake results in appropriate functioning and metabolism of different aquatic plants and organisms. PSB are competent biofertilizer to amplify aquaculture production for sustainable development.     

Do African Economies Grow Similarly?

Abstract

This paper examines economic growth in 52 African countries for 1961–2016 and seeks to find if there is common growth. As all African countries have their particular features, concerning climate, harvest, industry, size, politics, and infrastructure, and more, it seems best to rely on a non-parametric method. Dynamic Time Warping is such a convenient method, also as it allows leads and lags across countries to vary over time, and as it can easily be incorporated into a clustering technique. Five clusters are found, two of which concern Equatorial Guinea and Botswana, and the three other clusters have common growth rates of about 0, 2 and 4 over more than five decades.     

苏丹Muglad盆地大型油气藏储集特征

经过10余年的勘探开发,苏丹的Muglad盆地已成为中石油海外勘探开发的主战场。厘定该盆地这种突出商业价值的地质因素主要表现在以下两个方面:1)被动裂谷的多旋回推移,在坳陷期的准平原背景下沉积了高岩石成分成熟度的石英砂岩,加之超淡地层水的成岩环境,最终形成盆地的高孔高渗储层;2)“教科书”式的生储盖组合。     

我国华东区主要燃煤电厂及其用煤情况

论述了华东地区的主要燃煤电厂的分布、装机容量和发电量等有关技术参数以及其燃煤的调入地区和数量。表明华东地区是我国发电装机容量、发电量、耗电量和调入电煤量全国最多的地区之一。     

非洲主要石油资源国财税对比研究

受国际油价持续低迷影响,越来越多的石油公司陷入经营困境甚至濒临破产,这给中国石油公司“走出去”创造了十分难得的资产并购投资黄金窗口期。随着中美贸易摩擦越来越大,非洲石油资源丰富且与中国长期友好,成为中国石油公司走出去开展国际能源合作的首选区域。认真研究比较分析其资源国财税条款优劣,是决定未来能否获取较高投资收益的关键因素之一。本文详细介绍了非洲主要石油资源国的合同类型和财税条款,创造性地采用五个影响投资效益的关键指标对非洲主要资源国财税条款进行综合指标法评比排序,对于中国石油公司在非洲开展能源战略选区和从事石油天然气勘探开发,具有十分重要的参考价值。     

“西风东渐”的在地实践：汉口租界 园林钩沉

汉口在19世纪中叶第二次鸦片战争后被辟为通商口 岸，各国租界相继设立，租界园林应运而生，在引入各宗主国 园林营造风格的同时，为在留外人提供了亟须的生活与娱乐空 间，也是彰显殖民政治霸权的窗口。但有限的土地资源、水患 频仍的自然条件，使汉口租界园林规模与发展远不及上海、天 津等沿海通商口岸城市，也相应形成了鲜明的“在地性”：各 国租界园林以建筑附属园林为主，甚至催生了屋顶花园的园林 类型，但也限制了宗主国园林营造风格的充分植入；“公园” 这一在其他城市租界早已普及的园林形式，在有效控制水患、 进而获得更多可资利用的建设用地之后，才在20世纪20年代 经由日本人之手有所建置。此外，各国租界出于营商便利沿长 江串联排布，并随之形成了近代汉口特有的外滩“绿带”风景 线。汉口租界园林奠定了近代以租界为轴心的绿地系统雏形， 促进了华界屋顶花园、营商经营性园林的建设，对汉口的近代 化发展具有重要的历史意义。     

东海大桥结构混凝土耐久性策略

东海大桥是国内首次采用100年设计基准期的世纪工程,为此,从结构混凝土环境腐蚀荷载、海工混凝土耐久性的技术措施、结构混凝土耐久性策略的确定诸方面,对大桥主体结构的耐久性进行了科学研究。     

南部非洲房地产开发风险分析实例

南部非洲的建筑市场潜力很大,进入这片土地的开发商和承包商越来越多,竞争越来越激烈。房地产开发和工程承包的成功与否在很大程度上取决于风险管理的水平。本论文阐明了南部非洲房地产开发风险分析的主要环节和内容,分析了南非一个中成本住宅项目在开发过程中遇到的风险事件以及风险发生的原因,以期为将进入和已经进入非洲的房地产开发商和承包商提供一些可供参考的风险管理信息。