波雷因快速构筑水闸墙封堵突水点技术应用

以25091掘进工作面突水点水害治理工程为例,介绍了一种利用波雷因化学材料注浆法快速构筑水闸墙封堵突水巷道技术,即先使用波雷因化学材料快速建造水闸墙,再联合运用传统的综合注浆法对水闸墙骨架及周围煤体进行注浆加固形成墙实体,然后关闭阀门对突水点注浆封堵,达到了快速注浆堵水的目的。经过事实证明该技术能够快速有效地治理突水水害,可为其他水害治理提供借鉴和指导作用。     

Regional erosion risk mapping for decision support: A case study from West Africa

Effective soil and water management strategies require regional-scale assessment of erosion risk in order to locate prioritized area of intervention. Our study focuses on the Atacora mountain and surrounding areas (covering more than 18% of the total land area of Republic of Benin) which face a serious erosion threat despite their ecological and economic importance. To appraise the level of soil erosion risk of large area, we rely on the Instituto Nacional para la Conservación de la Naturaleza (ICONA) erosion model and use data from geographic information system (GIS). The erosion risk model requires four main inputs, namely, information on slope, lithofacies, land use and vegetation cover. The slope layer computed from ASTER digital elevation model (DEM) and the lithofacies layer inferred from digital pedogeological map are combined to draw soil erodibility map. To build soil protection map, we use land use/land cover layer extracted from LANDSAT 7 ETM + images in addition to vegetation cover layer derived from MODIS NDVI product. The final erosion risk map (with a resolution of 1 arc second) is obtained by overlapping erodibility and soil protection maps. We find that 21.8%, 58.5%, and 19.5% of the study area presents very low to low, medium, and high to very high level of erosion risk, respectively. Moreover, our findings are aggregated at the district-level (administrative unit). We observe that erosion risk is more acute in Boukoumbe district. Kerou, Kobli and Natitingou districts are mildly affected by erosion risk, while Kouande, Materi, Pehunco, Tanguieta and Toucountouna districts face a low risk. Ultimately, the proposed erosion risk map can help researchers and decision makers design and implement effective soil and water management interventions in the study area.     

Local perception of a regulatory order Closing down an abstraction point as a crisis indicator?

The closure of a drinking water catchment and deterioration of water quality raise questions about concepts such as water quality and territory. This prompts us to consider the interactions between resource and environmental policy, insofar as sensitivity to the standard of water used for human consumption is high and where its operation involves a large number of actors: state departments, public managers and private firms, land and water users and their representatives. Investigations by semi-directive interviews and surveys were conducted with users and water managers at three sites in Brittany (Finistère and in Ille-et-Vilaine) affected directly or indirectly by the Grenelle 1 bill. The results of the survey suggest that the crisis, if it exists, is attributed by the actors to the quantitative evolution of the resource and to regulations perceived as arbitrary in a context of poorly-controlled environmental dynamics. The socio-economic obstacles to quality improvement are frequently advanced in discussions, but management policies capable of removing these obstacles are very rarely mentioned. Instead, the stakeholders place their trust in technological solutions and work towards the political construction of functional solidarities.     

最优控制下民办高校科研激励的共享努力合同设计——基于间接原料供应模型的思考

长期以来,科研工作的突破一直是我国民办高校的困扰,其难点在于如何确定在最优控制科研投入水平下的激励教师提高科研产出水平。本文首先确定民办高校科研产出的最优水平,然后以间接原料供应模型为基础,通过共享努力合同的设计以提高学校和教师双方的努力程度,最终达到动态最优化。     

实验员如何控制高速公路混凝土质量

文章主要从原材料控制、混凝土配合比调整流程、混凝土出厂控制、运输过程控制、施工现场控制等方面,对如何控制高速公路混凝土质量进行了分析。     

浅谈景观水补给水工程设计

为了改善水质、补给水量和恢复水体的景观与娱乐功能,实施了长春市南湖景观水补给水工程。经方案论证后,采用了新型高效混凝沉淀—小阻力普通快滤—加氯消毒的净水工艺。介绍了该工艺的设计及参数。运行表明,该工程达到并优于设计要求。     

小溶江水利枢纽消力池设计

小溶江水利枢纽消力池是整个枢纽消能建筑物的重要组成部分,设计中根据工程布置,对消力池进行水力计算、结构计算、应力计算,从而获得经济合理的结构。     

Space matters: the importance of amenity in planning metropolitan growth

Most Australian capital cities require many 100,000s of additional dwellings to accommodate demographic change and population pressures in the next two or three decades. Urban growth will come in the form of infill, consolidation and urban expansion. Plans to redevelop environmental amenities such as parks and open green spaces are regularly being put forward to local councils and State governments. Maintaining parks and reserves represents one of the largest costs to local councils. To aid in the evaluation of some of the different propositions, we report the results of a spatial hedonic pricing model with fixed effects for Adelaide, South Australia. The results indicate that the private benefits of a close proximity to golf courses, green space sporting facilities, or the coast, are in the order $0.54, $1.58, and $4.99 per metre closer (when evaluated at the median respectively). The historic Adelaide Parklands add $1.55 to a property’s value for each additional metre closer. We demonstrate how the estimated model could be used to calculate how local private benefits capitalized in property values change with changes in the configuration of a park.     

衡钢水系统降硬节水实施可行性研究

针对衡钢各分厂循环水硬度较高和工业新水用水量较大的问题,文章通过清洁生产系统分析方法查找问题产生的原因,并提出解决思路和具体措施。当该项目实施完成后,该厂用水消耗达到钢铁企业国内基本清洁生产水平,将取得明显的环境效益和经济效益。     

新时期如何做好水利行政工作之探究

我们要充分认识水行政工作面临的新形势,毫不动摇地以科学发展观为指导,坚持以人为本的执法理念,紧紧围绕水利中心工作,扎实做好新时期水行政工作。