Synthesis of a New Cobalt （Ⅱ） Complex and its Interaction with DNA

A new complex of bis(N-benzyl benzotriazole-N^3) dichloro Co(Ⅱ) (Co(Ⅱ)L2Cl2) was synthesized and its crystal was characterized. The interaction of this new complex with fs-DNA was studied by electrochemical and UV spectrophotometric method. In 0.01 mol/L pH 4.2 Tris-HCl buffer solution Co(Ⅱ)L2Cl2 has two reductive peaks with peak potentials at 0.38 V and 0.27 V, respectively, and an oxidative peak at 1.05 V. After the addition of DNA, the peak currents decrease and the peak potential at 0.27 V shifts negatively. The UV spectrophotometric experiment indicates that the maximum absorbance of Co(Ⅱ)L2Cl2 at 204 nm decreases and exhibits bathochromic shift after the addition of DNA. All the results reveal that Co(Ⅱ)L2Cl2binds with DNA by intercalation as well as electrostatic interaction.     

45 nm芯片铜互连结构低k介质层热应力分析

采用铜互连工艺的先进芯片在封装过程中,铜互连结构中比较脆弱的低介电常数(k)介质层,容易因受到较高的热机械应力而发生失效破坏,出现芯片封装交互作用(CPI)影响问题.采用有限元子模型的方法,整体模型中引入等效层简化微小结构,对45 nm工艺芯片进行三维热应力分析.用该方法研究了芯片在倒装回流焊过程中,聚酰亚胺(PI)开口、铜柱直径、焊料高度和Ni层厚度对芯片Cu/低κ互连结构低κ介质层应力的影响.分析结果显示,互连结构中间层中低κ介质受到的应力较大,易出现失效,与报道的实验结果一致;上述四个因素对芯片低κ介质中应力影响程度的排序为:焊料高度＞PI开口＞铜柱直径＞Ni层厚度.     

Spectroscopic and Electrochemical Studies of the Interaction Between Fuchsin Basic and DNA

Introduction DNAbiosensorsareacompletelynewtypeoftech nologicalconceptionsbyusingspecificaffinitybetween mattersinlivingbeingstodistinguishdirectlyand quicklysequence specificDNA[1].Withtherapidde velopmentofgeneticengineering,oneofthekeyissues needtobere…     

双管齐下的Wi-Fi测试

以IEEE802．11标准为基础的无线网络在设备数量和应用范围两个方面都做好了实质性发展的准备。然而，与有线网络相比较，无线网络本身固有的移动特性使物理层与协议层之间产生的交互作用大大增加了验证一个设计所需的测试的复杂性和测试的次数。所幸的是，能够使这一过程合理化的各类工具正在不断出现。     

Ocean-Atmosphere Interaction in the Lifecycle of ENSO： The Coupled Wave Oscillator

To explain the oscillatory nature of E1 Nino/Southern Oscillation （ENSO）, many ENSO theories emphasize the free oceanic equatorial waves propagating/reflecting within the Pacific Ocean, or the discharge/recharge of Pacific-basin-averaged ocean heat content. ENSO signals in the Indian and Atlantic oceans are often considered as remote response to the Pacific SST anomaly through atmospheric teleconnections. This study investigates the ENSO life cycle near the equator using long-term observational datasets. Space-time spectral analysis is used to identify and isolate the dominant interannual oceanic and atmospheric wave modes associated with ENSO. Nino3 SST anomaly is utilized as the ENSO index, and lag-correlation/regression are used to construct the composite ENSO life cycle. The propagation, structure and feedback mechanisms of the dominant wave modes are studied in detail. The results show that the dominant oceanic equatorial wave modes associated with ENSO are not free waves, but are two ocean-atmosphere coupled waves including a coupled Kelvin wave and waves are not confined only to the Pacific a coupled equatorial Rossby （ER） wave. These Ocean, but are of planetary scale with zonal wavenumbers 1-2, and propagate all the way around the equator in more than three years, leading to the longer than 3-year period of ENSO. When passing the continents, they become uncoupled atmospheric waves. The coupled Kelvin wave has larger variance than the coupled ER wave, making the total signals dominated by eastward propagation. Surface zonal wind stress （x） acts to slow down the waves. The two coupled waves interact with each other through boundary reflection and superposition, and they also interact with an off-equatorial Rossby wave in north Pacific along 15N through boundary reflection and wind stress forcing. The precipitation anomalies of the two coupled waves meet in the eastern Pacific shortly after the SST maximum of ENSO and excite a dry atmospheric Kelvin wave which quickly circles the whole equator and leads to a zonally symmetric signal of troposphere temperature. ENSO signals in the Indian and Atlantic oceans are associated with the two coupled waves as well as the fast atmospheric Kelvin wave. The discharge/recharge of Pacific-basin-averaged ocean heat content is also contributed by the two coupled waves. The above results suggest the presence of an alternative coupled wave oscillator mechanism for the oscillatory nature of ENSO.     

因素交互作用分析的广义线性模型

为了估计疾病暴露因素之间的交互作用,提出了一种分析疾病暴露因素的交互作用的有效方法.该方法建立一个广义线性模型,通过估计模型中的参数及方差、协方差,定量的分析交互作用的大小和类型,不仅适用于队列研究资料,同时也适用用于病例-对照研究资料.     

基于混沌表示的广义Fock空间

混沌表示是白噪声分析的关键.考虑目前的基于广义Fock空间的两种混沌分解所依赖的n粒子空间的内积,本文得到了这两种n粒子空间的内积以及两种广义Fock空间的关系.     

Ce_(1-x)Fe_xO_2复合氧化物的结构及其催化碳烟低温燃烧性能

用水热法制备了不同摩尔比的系列Ce1-xFexO2复合氧化物碳烟燃烧催化剂.采用X射线粉末衍射(XRD)、比表面积(BET)、拉曼光谱(Raman)、H2程序升温还原(H2-TPR)及程序升温氧化反应(TPO)等技术考察了Fe含量对催化剂结构和性能的影响,重点探讨了催化剂表面性质和体相结构与催化活性和稳定性之间的关系.结果表明,Fe3+较难进入CeO2晶格中,部分Fe2O3分散在CeO2表面.铈铁固溶体(氧空位)有利于氧的吸附活化,而表面氧化铁对提高催化剂的抗老化能力起着重要作用.Ce0.8Fe0.2O2有最高的Fe3+掺杂量,有良好分散性的表面Fe2O3,显示出最好的催化活性和稳定性,催化碳烟的起燃温度(Ti)和生成CO2的峰值温度(Tp)分别为262和314℃.Ce0.8Fe0.2O2高温老化后的Ti和Tp仍较低,分别为292和392℃.     

TTPCom AJAR 3G 应用平台大幅提升功能手机开发速度

随着3G很快将要到来,其所需的应用也在不断增加,这造成了集成测试的工作要耗费大量时间,而应用程序之间交互作用产生的复杂度和风险也大大增加。同时,手机制造商将展开差异化竞争,希望利用不同的硬件平台来服务不同的市场。另外,电信运营商和O E M厂商也有深层次定制的需求。TT     

基因-基因(环境)交互作用分析方法的比较

对复杂疾病病因研究中基因-基因(环境)交互作用的3种分析方法进行了比较,剖析了它们的适用条件和优缺点.结果表明:叉生分析简单易行,但只适用于分析单个遗传和单个环境因素的交互作用; Logistic 回归易解释交互作用的流行病学意义且能很好地分析主效应,但在分析高阶交互作用时存在局限性;多因子降维法无需指定特定的遗传模式且对高维数据敏感,但无法估计主效应.鉴于这3种方法在分析交互作用时各有其优点,三者联合应用于交互作用分析效果更佳.