数字科技

【国际】1．5GB／min 韩国三星电子近日发表了已研发成功的世界上运行速度最快的两种存储卡——“MMC plus”。这两种存储卡的容量均为12GB，读速为每秒40MB，写速为每秒25MB，比现有存储卡约快3倍。换句话说，这两种存储卡可在1分钟之内将保存在卡内的1千张照片或500首MP3音乐或2小时的DVD影像传输到电脑里。该存储器均采用了4GB单级单元（SLC）NAND型闪存技术，而SLC适用于一个芯片配一个存储器的方式，体现快速性，另一方面，如果采用一个芯片上有两个以上存储器的MLC方式，则能够体现大容量。     

四聚1，3．二硫杂环戊烯-2-硫酮冠醚衍生物的合成

以二（碘乙基）醚与4,5．二氰乙硫基-1，3．二硫杂环戊烯-2-硫酮为起始原料，采用氰乙基保护与脱保护技术，通过多步缩合反应以较好的收率合成了含4个1，3．二硫杂环戊烯-2-硫酮并硫杂36冠-12（5），给出了目标化合物的有效合成方法，并用1HNMR，MS和EA对其进行了表征．     

Strategy for the mapping of interactive genes using bulked segregant analysis method and Mapmaker/Exp software

A qualitative trait is usually controlled by a single gene, but it may be sometimes controlled by two or even more genes. This phenomenon is called gene interaction. Rapidly searching for linked mo- lecular markers via bulked segregant analysis (BSA) and then constructing regional linkage map with Mapmaker/Exp has become a common approach to mapping single major genes. However, methods and computer programs developed for mapping single major genes cannot be simply applied to interactive genes because the genetic patterns of gene interac- tions are quite different from that of single-gene in- heritance. Up to now, experimental methods for quickly screening molecular markers linked to inter- active genes and statistical methods and corre- sponding computer softwares for simultaneously analyzing the linkage relationships of multiple mo- lecular markers to an interactive gene have not been available. To solve this problem, in this paper, we propose a strategy for mapping interactive genes using BSA and Mapmaker/Exp. We demonstrate that all interactive genes can be mapped by the 'BSA Mapmaker/Exp' strategy using F2 generation (in a few cases, F3 generation is also needed). As BSA and Mapmaker/Exp have been broadly used in gene mapping studies and are well known by many re- searchers, the strategies proposed in this paper will be useful for practical researches.     

Thermal conductivity measurement of InGaAs/InGaAsP superlattice thin films

The thermal conductivities of InGaAs/ InGaAsP superlattices with different period lengths were measured from 100 to 320 K using 3ω method. In this temperature range, the thermal conductivities were found to decrease with an increase in temperature. For the period length-dependant thermal conductivity, the minimum value does exist at a certain period length, which demonstrates that at a short period length, superlattice thermal conductivity increases with a decrease in the period length. When the period is longer than a certain period length, the interface thermal resistance dominates in phonon transport. The experimental and theoretical results confirmed the previous predictions from the lattice dynamics analysis, i.e. with the increase in period length, the dominant mechanisms of phonon transport in superlattices will shift from wave mode to particle mode. This is crucial for the cutoff of the phonons and lays a sound foundation for the design of superlattice structures.     

软件“活时代”来临

2005年11月初。微软在旧金山揭开了在线服务Windows Live和Office LiVe的神秘面纱．微软称此在线软件为“活时代”。     

SOA：纺织未来IT架构

SOA之热仍在蔓延。美国加州圣塔克拉拉举办的2006软件大会上，主流厂商和财富500强企业的CIO们冠盖云集，或指点企业信息化迷津，或畅谈未来IT架构，或讨论软件技术创新。而每一个热门话题，每一次思维碰撞，似乎总是绕不过一个话题——面向服务的架构SOA![编者按]     

石油产品设计的优化模型

本文根据某炼油厂炼油的实际生产流程,建立了一个石油产品设计的优化模型,并利用LINGO数学软件计算出该模型的一个最优解,该模型对炼油企业合理地选购原油、优化工艺流程、优化产品设计方案,充分利用企业可用资源,降低生产成本、提高产品质量、获取更好的经济效益具有一定的理论指导意义。     

两个角度描述的η-η′混合的研究

根据PDG-2004给出的J/ψ→VP各衰变道的分支比的世界平均值,利用对能量有依赖的η-η′混合角方案,对赝标量介子混合重新作了分析,由此得到η和η′的混合角θη=(-9.0±4.9)°,ηθ′=(-20.8±3.0)°.对J/ψ衰变中DOZI的贡献和SU(3)破坏也作了讨论和分析.     

软件演化过程的度量数据采集策略研究

度量数据的采集是度量软件过程的重要环节,讨论了度量数据的采集过程中遇到的问题,以及有效数据采集应遵循的原则,并针对软件演化过程的特点及不同的应用提出了2种数据采集的策略．     

叠加势V（r）=B6r^6＋B5r^5＋B4r^4＋B3r^3＋B2r^2＋B1r schroedinger方程的解析解

根据波函数的有限性和叠加势函数的渐近性质，通过待定波函数的设定，得到势函数表示为V（r）=B6r^6＋B5r^5＋B4r^4＋B3r^3＋B2r^2＋B1r的径向schroedinger方程的精确的能量本征值和本征波函数。