基于XML/SOAP的VPN策略集中管理

就如何对VPN进行高效管理的问题 ,结合新兴的XML技术 ,提出了一个对VPN进行集中策略管理的模型 .该模型的效率较高 ,扩展性强 ,具有较大的现实意义     

硫酸链霉素的单扫描示波极谱法测定

建立了测定硫酸链霉素的新方法。在0.5mol/L NH_3-NH_4Cl(pH 10.4)缓冲溶液中,硫酸链霉素产生两个还原波,峰电位分别为-1.44V和-1.55V,其中-1.55V处还原波的二阶导数峰电流与硫酸链霉素浓度呈线性,线性范围为250～1100μg/mL,检测下限为200μg/mL。该方法用于注射液中硫酸链霉素含量的测定,结果满意。     

浅谈对《中学体育与健康课程标准》的思考

《中学体育与健康课程标准》出台,中学体育教育从性质、价值定位等方面发生了很大变化,它要求教师从观念到教法均要与时俱进,但对在实施过程能否顺利推进,笔者提出了一些问题。     

Archaeal acylamino acid releasing enzyme/lipase:Crystallization and preliminary crystallographic analysis in a new crystal form

A primitive orthorhombic crystal form of acylamino acid releasing enzyme‘lipase(APE1547)from hyperthermophilic archaeon Aeropyrum pernix strain K1 has been obtained at 291K.The diffraction pattern of the crystal extends to 0.27nm resolution at 100K using Cu Kαradiation.The crystal belongs to the space group P212121 with unit cell dimensions of b=6.399,b=10.439and c=16.953nm.The presence of two molecules per asymmetric unit gives a crystal volume per protein mass(Vm)of 0.0022nm^3 Da^-1 and a solvent content of 43% by volume.A full set of X-ray diffraction data were collected to 0.3nm from the native crystal.     

^210Pbex depth distribution in soil and calibration models for assessment of soil erosion rates from ^210Pbex measurements

Throughout the past decade, the potential for using nuclear weapon-produced 137Cs ( half-life 30.2 a) fallout to quantify soil erosion rates on both cultivated and uncul- tivated lands for medium-term timescales (≈ 40 a) has been successfully demonstrated in a wide range of envi- ronments in different regions of the world[1—6]. Because in difficulties of distinguishing Chernobyl-derived compo- nent from total 137Cs input in many parts of Europe, and in measuring low activity samples of…     

A complete sequence and comparative analysis of a SARS-associated virus(Isolate BJ01)

Severe Acute Respiratory Syndrome (SARS) is a newly identified infectious disease[1—5]. The global outbreak of SARS has been threatening the health of people worldwide and has killed 353 people and infected more than 5462 in 27 countries, as reported by WHO on April 29, 2003 (http://www.who.int/csr/sarscountry/en). Although it has been recognized that a variant of virus from the family of coronavirus might be the candidate pathogen of SARS[1—5], its identity as the unique pathogen sti…     

东营凹陷胜坨地区沙三-沙四段扇体特征与岩性油气藏

东营凹陷胜坨地区沙四段、沙三段沉积时期 ,发育了洪积扇、近岸水下扇和浊积扇 3种扇体沉积 ,根据其沉积、成藏特征分析了 3种扇体的成藏规律和分布特点。研究结果表明 ,沙四段沉积期主要发育洪积扇 ,岩性以砾岩、含砾砂岩为主 ,断层附近砂体的储集性能好 ,多形成背斜和断块油气藏 ;沙三段下部沉积期发育近岸水下扇 ,岩性以砾岩、含砾砂岩为主 ,扇中储集物性最好 ,多形成构造岩性油气藏 ;沙三段中部沉积期发育浊积扇 ,岩性以砂岩为主 ,储集性能好 ,但砂体薄 ,多形成透镜体和上倾尖灭油气藏     

Bi含量对SrBi4Ti4O15铁电材料性能的影响

~~Bi含量对SrBi_4Ti_4O_(15)铁电材料性能的影响@朱骏$扬州大学物理科学与技术学院!江苏扬州,225002 @毛翔宇$扬州大学物理科学与技术学院!江苏扬州,225002 @卢网平$扬州大学物理科学与技术学院!江苏扬州,225002 @惠荣$扬州大学物理科学与技术学院!江苏扬州,225002 @陆文峰$扬州大学物理科学与技术学院!江苏扬州,225002 @陈小兵$扬州大学物理科学与技术学院!江苏扬州,225002~~~~~~~~     

舟桥丙丁接头接触分析的计算机模拟

深入考察接触行为的特点，并以舟桥纵向连接件丙丁接头为例，建立了两种接触计算模型。采用大型通用有限元程序进行分析，模拟丙丁接头受力时的应力应变。与经验合成计算结果和常规有限元分析的结果进行对比，证明接触分析方法对连接件塑性变形、疲劳分析和优化设计有重要的指导意义。     

[(n-C4H9)2Sn(2-PyCO2)2(H2O)] 的合成、晶体结构

利用三丁基氯化锡和2-吡啶甲酸在三乙胺存在下以1:1摩尔比反应,合成了非预期有机锡配合物[(n-C4H9)2Sn(2-PyCO2)2(H2O)].通过元素分析、红外光谱、核磁共振氢谱和X-射线单晶衍射对其结构进行了表征.测试结果表明,该配合物为单体结构,锡原子呈七配位畸变五角双锥构型.通过配位水分子和游离羰基氧原子的氢键作用,形成了二维网状结构.