解决分布式数据库2PL执行-提交冲突的一种改进的乐观方法

分布式数据库系统通常采用2PL(两阶段锁定协议)来维护其一致性.本文运用Shadow-Opt方法,通过区分写操作将新旧算法结合从而保证一致性并提高性能.     

Review of New Space for Women.

Reviews the book, New Space for Women edited by Gerada R. Wekerle, Rebecca Peterson, and David Morley (1981). New Space for Women is the author's depiction of the need to formally establish a multidisciplinary field of women and the environment. The book is a collection of 17 original review articles selected from diverse areas, including urban design and planning, social services and academic research, organized under this common theme. The papers are grouped into four general themes: the domestic workplace, effects of urban design on women, women as environmental decision makers, and women as environmental activitist. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

下游梯级河川式水库冲淤计算与预测

本文考虑到下游梯级水库形态的变化同时受到上游梯级水库和其自身水库调蓄运用的影响,提出下游梯级河川式水库冲淤计算的方法。后经紫兰坝水库河工模型验证,表明该法精度良好,计算结果与实验比较一致。     

NUMERICAL STUDY OF TURBULENT JETS CONFINED BETWEEN TWO CONCENTRIC SPHERES

ＮＵＭＥＲＩＣＡＬＳＴＵＤＹＯＦＴＵＲＢＵＬＥＮＴＪＥＴＳＣＯＮＦＩＮＥＤＢＥＴＷＥＥＮＴＷＯＣＯＮＣＥＮＴＲＩＣＳＰＨＥＲＥＳＺｈａｎｇＧｕａｎｇ－ｈｕａ；ＴａｎｇＧｅ－ｆｅｎｇ（ＴｓｉｎｇｈｕａＵｎｉｖｅｒｓｉｔｙ，Ｂｅｉｊｉｎｇ，１０００８４，...     

Network characteristics of homopolymer and some copolymers of poly(2-hydroxyethyl methacrylate)

Soluble poly(2-hydroxyethyl methacrylate) and copolymers of 2-hydroxyethyl methacrylate with n-butyl acrylate and 2-hydroxypropyl acrylate of varying compositions were synthesised by solution polymerisation. The polymers were characterised by dilute solution viscometry and shear viscosity. Crosslinked membranes were prepared from these polymers by introducing crosslinks in solution state through the reaction with 1,6-hexamethylene diisocyanate at a number of different crosslinker concentrations. The membranes swollen in dimethylformamide and water were characterised by performing equilibirium swelling measurements and calculating polymer volume fraction, the molecular mass between crosslinks (M?^c) and equilibrium water content (EWC) at 25°C. The calculation of M?^c used an expression developed by Peppas & Lucht for equilibrium swelling. This is a modified equation of the original Flory–Rehner expression, that allows non-Gaussian distribution of chain lengths. The variation of M?^c with crosslinker concentration and copolymer composition is discussed in terms of structural and molecular characteristics of these highly crosslinked networks.     

深圳信息通信网的现状及发展

本文介绍了深圳公众电话网、数字数据网、移动通信网及有线电视网等信息通信网的现状，并对方向宽带化、智能化和个人化的综合业务数字网方向发展。     

树形光纤网络信息流量分配的研究

本文介绍了在无源光网络中上行信号传输复用采用ＴＤＭＡ方式的流量分配问题，通过论证提出一种比较高效的流量分配算法。同时，这种算法也适用于正待解决的ＡＴＭ带宽动态分配问题。     

Editor’s comment.

Comments on the first four papers in this issue of Rehabilitation Psychology, which form a topical thesis on the ideology of rehabilitation services. The first paper points out some of the failings of the rehabilitation services system and notes that this system has often fallen short of the goals that it was designed to meet and frequently serves the needs of service providers rather than clients. The second paper and the third paper provide a response to these criticisms, essentially agreeing with the position that the rehabilitation service delivery system has not lived up to the potential that was envisioned for it by its designers, and they discuss the realities of the bureaucratic system imbedded in the political system that defines our public policies. The last paper is a response to and critique of the three previous papers, and presents an alternative view, noting that the rehabilitation service system and the political system of which it is a part are continually affected by response and stimuli from the outside world, and therefore continually evolve. (PsycINFO Database Record (c) 2010 APA, all rights reserved)