半线性椭圆问题Petrov-Galerkin逼近及亏量迭代

本文考虑了二阶半线性椭圆问题的Petrov-Galerkin逼近格式,用双二次多项式空间作为形函数空间,用双线性多项式空间作为试探函数空间,证明了此逼近格式与标准的二次有限元逼近格式有同样的收敛阶.并且根据插值算子的逼近性质,进一步证明了半线性有限元解的亏量迭代序列收敛到Petrov-Galerkin解.     

清理三角债问题的一种方法

本文给出了一种清理三角债问题中的资金分配方法，用以实现用有限的资金清理最大数额债务的目的．由于该法是在网络图上进行的，较之以往的方法具有直观、操作简单的优点．     

Magnetic Field Modulated Direct Overwrite with Continuous Wave LaserIrradiation for Magnetic-optic Disks

1.IntroductionAtpresent,therearetwokindsofpracticalrewritableopticalstorage:phase-changeoptiCalandmagneto-opticalstoraged].Magneto-opticaldatastorageisattractiveformassdatastoragebecauseofitshighrecordingdensityandthecontinuouslyincreasingdatatransferrate.DirectoverwriteisapromisingschemetoobtainhighdatatransferratellJ.Magneticfieldmodulation(MFM)andlightintensitymodulation(Lin)arethemajormethodstorealizemagneto--opticaldirectoverwrite[2-8].InLIM,pulsedlaserintensityismodulatedaccordingtot…     

Characteristics of reverse overwrite process in shingled recording scheme at ultra-high track density

A systematic experimental study of the reverse overwrite (ReOVW) process in the shingled recording scheme has been conducted in conjunction with characterization of corresponding recording performances from recording heads with different geometries. It was found that there is no ReOVW reduction as the track density increases in a strict shingled recording fashion. Nonetheless, ReOVW is indeed slightly decreased from 300 to 700 kpi in a so-called one write shingled recording process. Overall our obtained data suggest that conventional magnetic recording technology might be able to extend all the way beyond an areal density of one Tbit/in² by using the shingled recording scheme.     

New Disk Structure for Million Cycle Overwritable Phase Change Optical Disk

The overwrite cycle characteristics and environmental stability of a phase change optical disk with a new disk structure were demonstrated. The C/N ratio was around 55dB, the erase ratio was around 25dB and the phase jitter was under 50% throughout the one million cycle overwrite test. The accelerated aging test conditions were 90°C, 80%RH, for 600 hours and 70°C, 80%RH for 5,200 hours. The archival and shelf one million overwrite cycle characteristics of phase jitter were stable throughout the aging test. The life expectancy of the disk is anticipated to be more than 60 years in a 32°C, 80%RH environment.Presented at the International Commission for Optics Topical Meeting, Kyoto, 1994.     

用因子分析法构建医院顾客让渡价值模型

使就医顾客满意对于加强医院的竞争力十分重要。本文选择十六项指标构建就医客户满意指标体系,通过因子分析法将其简化为六个主因子,它们分别是医师服务态度、就诊方便程度、医疗水平、候诊方便、收费高低、诊疗手续。基于这些主因子,我们建立医院顾客让渡价值模型。并根据该模型,分析医院的经营策略。     

基于结构方程的高速公路BOT项目政策风险评价

借助结构方程方法建立了高速公路BOT项目政策风险的评价指标体系和评价模型.通过问卷调查得到的数据,对所构建的模型进行了拟合检验和模型参数估计,进而分析了政策风险中各种因素的影响程度以及各政策风险因素之间的相关关系.     

GeSbTe直接重写相变光盘动态写擦特性研究

ＧｅＳｂＴｅ体系是目前最适用于可重写相变光盘记录的材料，本文利用自己研制成功的相变光盘动态测试装置对本所研制的ＧｅＳｂＴｅ相变光盘进行了光盘动态写实验和材料性能研究，并实现了直接重写，取得了较大的进展。实验中发现脉冲擦除比直流擦除有较好的擦除效果和较多的重写次数。     

交通BOO项目特许权竞标机制设计

设计了交通BOO(build,own and operate)项目的竞标机制来提高项目拍卖者对特许经营权的配置效率.运用激励机制设计思想建立了竞标机制模型,在保证竞标企业参与投标和真实显示自己的经营能力的条件下最大化期望社会福利,通过求解此模型得到了最优的竞标机制;鉴于最优机制在形式上的复杂性,给出了得分规则拍卖和供应契约拍卖两种最优拍卖方式.