A NEW APPROACH TO THE NUMERICAL SIMULATION OF MASS TRANSPORT

A refined numerical method, based upon time-line interpolation, for the simulation of advection and diffusion has been tentatively explored. A complete set of temporal reachback numerical scheme in applying the method of characteristics has been derived, and the favorable accuracy of the method demonstrated. The use of interpolations in time, rather than the more widely used interpolations in space, demonstrates that it generates a much smaller numerical error.     

BPR的理论与实践——关于“业务过程重建”近十年发展的回顾与总结

本文讨论六个方面的问题：介绍：BPR的几种定义以及有三种类型的公司应实施BPR项目;明确进行：BPR时常用的工具和技术;说明：BPR和TQM的相似性以及两者在同一组织中的共存关系;讨论理解整个组织过程的重要性;明确与BPR相关的主要管理挑战;讨论应用BPR进行过程的再设计以及其中可以预见的一些风险;讨论经营和市场中发生的重大变化,最后本文针对BPR提出结论性意见并指明在BPR方面潜在的研究领域。通过本文的回顾可以看出,在BPR方面还需要作更多的研究。     

APPLICATION OF BODY－FITTED CURVILINEAR COORDINATE TRANSFORMATION IN 3－D SEEPAGE FLOW COMPUTATION

ＡＰＰＬＩＣＡＴＩＯＮＯＦＢＯＤＹ－ＦＩＴＴＥＤＣＵＲＶＩＬＩＮＥＡＲＣＯＯＲＤＩＮＡＴＥＴＲＡＮＳＦＯＲＭＡＴＩＯＮＩＮ３－ＤＳＥＥＰＡＧＥＦＬＯＷＣＯＭＰＵＴＡＴＩＯＮＦａｎｇＦａｎｇ－ｘｉｎ；ＱｉＬｉ；ＣｈｅｎＺｈａｏ－ｈｅ；ＰｅｎｇＹｕ（Ｓｃ...     

PROBABILITY DISTRIBUTION OF IN-LINE WAVE FORCES ON A PILE IN IRREGULAR WAVES

The probability distribution of in-line wave forces on a pile can bemathematically summed up to that of a theory and the assumption of wave period being constantare used and the above probability distribution is simplified to that of a single dimentsionfunction.The probability density functions of the peak values of total wave forces on a wholevertical pile in irregular waves are derived from that of wave height which is the Rayleighdistribution(deep water wave)or the Kerohovski distribution(shallow water waves)on the baseof the Morison Equation.The identification with experimental data shows that suchsimplification is successful.These distributions are compared with Weibull distribution andRayleigh distribution and the result shows that the shallow water distribution of wave forcesobtained here is the best one and can be used in practice.     

DYNAMIC RESPONSE IN ESTUARIES-AN ANALYTICAL MODEL

A simple analytical model is developed to interview the general features of theestuarine responses induced both by ocean tides and by low-frequency coastal fluctuations andwind forcings.Model estuary is assumed ideally with constant depth and linearly varyingbreadth.The results indicate that the effects of bottom friction coefficient,the water depth andthe breadth variation parameter on the estuarine response field virtually reflect the difference ofthe energy accumulation,transformation and dissipation in estuaries,It is found by comparisonthat there are obvious differences between tidally-induced and low-frequency forcing inducedestuarine variations.For tidal response,bottom friction is a very important factor to affect theresponse magnitude,while for low-frequency response this effect becomes negligible.Thus amore simplified model for low-frequency estuarine response is produced,which gives morestraightforward view to the response characteristics.Moreover,from the model solutions wededuce a general qualification for the estuarine resonance and discuss the relation between theresonance frequency and the estuarine geometry.     

MULTI-OBJECTIVE OPTIMIZATION IN SPILLWAY PROFILE OF GRAVITY DAM

The paper discusses the shape optimization of overflow surface of spillway.Thereare two parts:obne is a synchronous iterative method to solve a variational problem with variabledomain and unknown discharge for 2-D ideal potential flow;the other concerns an approach tomulti-objective optimal design of overflow surface.The primary application is successful and de-sirable.     

DEFORMATION AND BREAKINC OF NONLINEAR WAVE IN WATER OF GRADUALLY VARYING DEPTH

Based upon the perturbation method,this paper used the method of conformalmapping to solve the deformation and breaking of nonlinear waves in water of gradually varyingdepth.The wave characteristics,such as wave deformation,velocity field,breaker type andbreaker height are discussed by the third order approximation.Results obtained are comparedwith experimental data.     

PROPAGATION AND BREAKING OF WAVES ON SLOPING BEACH

In this paper the propagation and breaking of the solitary wave,the sinusoidalwave and the second Stokes wave on a slope of 1/30 are discussed based upon the TUMMACmethod,and the velocity fields of breaking waves on the slope are obtained by using the tracingmethod.The.numerical results for wave deformation are in good agreement with experimentaldata,and the breaker indexes depending on the kinetic criterion agree approximately with previ-ous results.Furthermore,compared with the experimental results measured by Iwagaki and bythe authors,the tendency of velocity distribution of breaking waves computed by this numericalmethod is also satisfactory.     

提高Tencel织物性能新工艺

Tencel纤维的生产工艺商业化应用迄今为止已有10年的时间,在技术、经济和环境方面证明是成功的,市场上出现的Tencel服装具有极好的舒适性、柔软的手感和独特的外观。近来在纤维卷曲方面以及染色后整理方面的改进使得纤维在梳理和纺纱过程中所表现出的性能发生明显的改善。Tencel纤维的加工工艺总体上包括以下几个步骤:把木浆溶解在NMMO溶剂中,在水浴中纺制成丝,然后洗涤、干燥和切断。溶剂可以高效重复利用,但大多数的过程需要新的高科技的设备和工艺。下面介绍一种Tencel纤维生产工艺的一个新特点,即利用丝束洗涤和干燥纤维的方法。传…     

A bed management strategy for overcrowding in the emergency department

In 2006, the Institute of Medicine cited growing visit volumes, hospital closures, financial pressures, and operational inefficiencies as the principal reasons for emergency department (ED) overcrowding and called for regulatory measures to resolve the problem. A Midwest medical center with 59,000 annual ED visits instituted a bed management strategy to decrease the need to board, or hold, admitted hospital patients in the ED awaiting transfer to an inpatient care unit. This strategy was successful in improving the hold time from an average of 216 minutes to 103 minutes, or by 52%. This allowed the staff at the hospital to care for an additional 2,936 patients. During this same time, the overall hospital mortality decreased by 0.07% and patient satisfaction scores improved 1%. The greatest outcome from this intervention was realized in the potential revenue increase of over $2 million.