关键词： 工程机械行业   东方红柴油机   动力元件   上海新国际博览中心   宝马   展放   品牌   亚太地区  

摘要： 1展会情况 “上海宝马工程机械展”是世界最大的工程机械展bauma在中国的延伸，同时也是2010年亚太地区最具影响力的国际性行业博览会。baumaChina2010暨第5届中国国际工程机械、建材机械、工程车辆及设备博览会于2010年11月23-26日在上海新国际博览中心召开。

关键词： 博士后科研工作站   集团公司   动力机械   国家级   江苏   管理委员会   社会保障   人力资源  

摘要： 近期，国家人力资源和社会保障部、全国博士后管理委员会下发人社部发（2010）60号文，批准中国福马所属江苏林海动力机械集团公司设立国家级博士后科研工作站。

关键词： 大型企业   创新   灵魂   品牌   高科技产品   持续发展   集团公司   生产基地  

摘要： 安徽金光机械集团股份有限公司座落于中国文都一安徽省桐城市，公司成立于1959年，公司经过了50多年的持续发展，由一规模很小的农机修造厂，现已发展成为以各类发动机凸轮轴、曲轴、气门等高科技产品为主导，集科、工、贸于一体的大型企业集团公司．为目前国内最大、品种最全的凸轮轴、曲轴、气门生产基地，

关键词： 美国经济   动力传动   工程机械   博览会   拉斯维加斯   国际   建筑市场   市场增长  

摘要： 2011年美国拉斯维加斯工程机械及动力传动博览会(CONEXPO-CON/AGG&IFPE)于3月22～26日在拉斯维加斯举行。尽管美国建筑市场和整体经济继续低迷,未来前景依然还不明确,但无论是参展商,还是代理商、用户都充满了乐观情绪。尽管有分析师认为北美市场增长乏力,但更多的业内人士认为,未来几个月美国经济将有希望持续好转,同时全球销售继续保持强势。

关键词： 造穴工具   动力学分析   销钉   ADAMS  

摘要： 在煤层气井裸眼洞穴造穴过程中,机械造穴工具的优劣影响到扩孔的质量与速度,是最关键的装置。介绍了大直径煤层气机械造穴工具(LCMRT)的结构特点及工作原理,基于牛顿-欧拉动力学方程对大直径煤层气井机械造穴工具的连接销理想约束反力进行了求解,运用ADAMS对大直径煤层气井机械造穴工具进行仿真分析,重点分析影响造穴工具使用寿命的销钉受力情况,得出销轴受力规律,进而指导工具的设计。

关键词： Stable phosphorus ylides   dialkyl acetylenedicarboxylates   Z and E isomers   AIM method  

摘要： Quantum mechanical calculation clarified how the ylides exist in solution as a mixture of the two geometrical isomers (Z- and E-) as a major or minor form. In addition, Kinetic studies were made for the reaction between triphenylphosphine, di-tert-butyl acetylenedicarboxilate in the presence of protic/nucleophilic reagent, such as 2-aminothiophenol. To determine the kinetic parameters of the reaction, it was monitored by UV spectrophotometery. The values of the second order rate constant (k(2)) were calculated using standard equations within the program. At the temperature range studied the dependence of the second order rate constant (Ln k(2)) on reciprocal temperature was in a good agreement with Arrhenius equation. This provided the relevant plots to calculate the activation energy of the reaction. Furthermore, useful information was obtained from studies of the effect of solvent and concentration of reactants on the rate of reaction. Proposed mechanism was confirmed according to the obtained results and steady state approximation and first step (k(2)) of reaction was recognized as a rate determining step on the basis of experimental data.

关键词： Kaolinite   Mullite   Mechanical activation   Non-isothermal kinetics  

摘要： The non-isothermal kinetics of mullite formation from both non-activated and mechanically activated kaolinite have been studied by differential thermal analysis (DTA). Kaolinite was mechanically activated in a planetary mill, while amorphization in the structure was studied by X-ray diffraction analysis. It was established that the mechanical activation especially affected the loss of structural water. The activation energies depending on the conversion for mullite formation have been calculated from the DTA curves by using the non-isothermal method of Coats and Redfern at heating rates of 5, 10, 15, and 20 A degrees C min(-1). The mechanical activation and amorphization of the kaolinite brings to the formation of mullite at a lower heating temperature.

关键词： Ulcer   Wounds   Lower Extremity   wound closure   Negative-Pressure Wound Therapy   Trials   Electricity  

摘要： The purpose of this study was to compare the ultraportable mechanically powered Smart Negative Pressure (SNaP(R)) Wound Care System to the traditional electrically powered Vacuum-Assisted Closure (VAC(R)) Therapy System in the treatment of chronic lower extremity wounds. This 12-center randomized-controlled trial of patients with noninfected, nonischemic, nonplantar lower extremity wounds had enrolled 65 patients, as of January 5, 2010, at the time of a planned interim analysis. Subjects were randomly assigned to treatment with either the SNaP(R) or VAC(R) Systems. The trial evaluated treatment for up to 16 weeks or till complete closure was achieved. Fifty-three patients (N527 SNaP(R), N526 VAC(R)) completed at least 4 weeks of therapy. Thirty-three patients (N518 SNaP(R), N515 VAC(R)) completed the study with either healing or 16 weeks of therapy. At the time of planned interim analysis, no significant differences (p=0.99) in the proportion of subjects healed between the two devices evaluated were found. In addition, the percent wound size reduction between treatment groups was not significantly different at 4, 8, 12, and 16 weeks, with noninferiority analysis at 4 weeks of treatment reaching the p-value <0.05 significance level (*p=0.019). These interim data suggest no difference in wound closure between the SNaP(R) System and the VAC(R) System in the population studied. We look forward to the final analysis results.

关键词： constitutive modelling   creep   kinetics   relaxation   time-dependent behaviour  

摘要： The time-dependent mechanical behaviour (TDMB) of softwood is relevant, e.g., when wood is used as building material where the mechanical properties must be predicted for decades ahead. The established mathematical models should be able to predict the time-dependent behaviour. However, these models are not always based on the actual physical processes causing time-dependent behaviour and the physical interpretation of their input parameters is difficult. The present study describes the TDMB of a softwood tissue and its individual tracheids. A model is constructed with a local coordinate system that follows the microfibril orientation in the S2 layer of the cell wall. The inclination of the local system to the global coordinate system reflects the microfibril angle of the tracheid. Normal excitations in the local system perform linear elastically, whereas shearing excitation in the local system produces both elastic and inelastic responses. The results of the model are compared with experimental results of different types. It was observed that the model is able to describe the results. Moreover, to some surprise, the introduction of only elastic and viscous properties on the microscopic scale leads to an apparent macroscopic viscoelasticity, i.e., the time-dependent processes are to a significant degree reversible.

关键词： Acetaminophen   Captopril   ECEC electrochemical mechanism   Thioether   Digital simulation  

摘要： In this work kinetics parameters and electrochemical mechanism for electrooxidation of acetaminophen in the absence and presence of captopril in a condition close to acetaminophen natural oxidation pathway was investigated. The electrooxidation of acetaminophen in the presence of captopril was investigated by voltammetry and coulometry methods. The results of this work show that acetaminophen is oxidized to its respective p-quinoneimine. The quinoneimine attacked by captopril, forms thioether. The proposed electrochemical mechanism is ECEC. The estimated value for homogeneous rate constant k(obs) is 3.1 x 10(4) +/- 155 M-1 s(-1) and k(f)/k(b) is 1.6 x 10(8) +/- 8.0 x 10(5).