SOLUTE TRANSPORT THROUGH THE VADOSE ZONE:FIELD STUDIES

ＳＯＬＵＴＥＴＲＡＮＳＰＯＲＴＴＨＲＯＵＧＨＴＨＥＶＡＤＯＳＥＺＯＮＥ：ＦＩＥＬＤＳＴＵＤＩＥＳ￥ＹｅＺｉ－ｔｏｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＨｙｄｒａｕｌｉｃＥｎｇ．，ＷｕｈａｎＵｎｉｖｅｒｓｉｔｙｏｆＨｙｄｒａｕｌｉｃａｎｄＥｌｅｃｔｒｉｃＥｎｇ...     

TWO-DIMENSIONAL SIMULATION OF FLOWS IN PLANE-WALL DIFFUSERS

A numerical model has been developed for computing turbulent flow in plane-walldiffuser.The model solves the weakly compressible flow equations with the application of theSmagorinsky's subgrid-scale turbulence model and the boundary conditions of partial slip and noslip at the solid wall.Application examples include two-dimensional calculations of unstalled andstalled flows in diffusers of small diverging angle,as well as transitory stall flow in a symmetricdiffuser of 16°total angle.For the unstalled and stalled flows,the calculated pressure recoveryand velocity profile are compared with experimental data.For the transitory stall flow,the com-putational result shows the unsteady flow features including the vortex shedding and stallwashout phenomena that have been experimentally observed.     

信贷需求：小额信贷覆盖率的决定因素之一——来自中国北方四县调查的证据

过去对小额信贷项目覆盖率的研究集中在供给方面,本文应用大规模农户调查的数据,从需求方面研究了中国三个小额信贷项目覆盖率低的问题。研究发现,在中国贫困地区试验的孟加拉乡村银行模式的小额信贷项目不能自动地瞄准贫困地区的贫困人口,许多贫困农户将自身排除在小额信贷市场之外。本文的结论是,尽管中国的小额信贷试点项目没有能自动瞄准贫困地区的贫困户,它们仍然对中国的扶贫做出了积极贡献。为了提高小额信贷项目对贫困人群的覆盖率,需要通过减少对贫困人口的其他约束、依照贫困人群的需要定制小额贷款产品等方式来提高贫困农户对小额贷款的需求。     

Managing materiel in a multidivisional corporation

By using centralized purchasing and prime vendor contracts, the Allied Services material management department has been able to handle very effectively the purchasing needs of this multidivisional health care complex. Through active enforcement of Allied Service's materiel management policies and procedures, the department continues to be able to acquire the products and services that are necessary to keep the many programs running. Most importantly, these products and services continue to be acquired while the three significant attributes of materiel management--quality, availability, and service--are maintained.     

In-house versus off-site sterilization

After a comprehensive review of in-house costs versus off-site sterilization costs, and considering financial and physical constraints, the decision was made to use the contracted service. Through the incorporation of the innovative concept of off-site sterilization. Flushing Hospital Medical Center was still able to provide a high standard of quality care as well as realize a significant cost savings. As hospitals face increasing demands to control costs, they may be forced to explore "uncharted waters" and give serious consideration to the use of outside services for a more efficient and effective CSS department.     

探秘“中国磁都”的自主创新

民营经济强劲发展的浙江,有一个海内外闻名的横店集团,在这个位列全国民营企业10强第3位、全国企业500 强第131位的横店集团麾下,有一个被誉为“中国磁都”的著名企业,她就是全国电子元件、全国电子信息百强企业——东磁有限公司!