Pore structure characterization and its effect on methane adsorption in shale kerogen

Pore structure characterization and its effect on methane adsorption on shale kerogen are crucial to understanding the fun-damental mechanisms of gas storage,tr...     

Electrostatic-lenses position-sensitive TOF MCP detector for beam diagnostics and new scheme for mass measurements at HIAF

A foil–microchannel plate(MCP) detector,which uses electrostatic lenses and possesses both good position and timing resolutions, has been designed and simulated for beam diagnostics and mass measurements at the next-generation heavy-ion-beam facility HIAF in China. Characterized by low energy loss and good performances of timing and position measurements, it would be located at focal planes in fragment separator HFRS for position monitoring, beam turning, Bρ measurement, and trajectory reconstruction. Moreover, it will benefit the building-up of a magnetic-rigidity–energy-loss–time-offlight(Bρ-△E-TOF) method at HFRS for high-precision in-flight particle identification of radioactive isotope beams on an event-by-event basis. Most importantly, the detector can be utilized for in-ring TOF and position measurements,beam-line TOF measurements at two achromatic foci, and position measurements at a dispersive focus of HFRS, thus making it possible to use two complementary mass measurement methods [isochronous mass spectrometry at the storage ring SRing and magnetic-rigidity–time-of-flight(Bρ-TOF) at the beam-line HFRS] in one single experimental run.     

嵌入式工业现场GPRS远程监控系统

在特定的工业环境中,由于地理环境偏远等问题,必须采用无线远程的方法进行监控。介绍了一种监控系统,系统采用32位ARM处理器与DSP视频压缩模块相结合,并考虑了实际的GPRS与视频传输的速度匹配问题,采用JPEG编码方式。     

Characterization,Expression Profiling,and Biochemical Analyses of the Cinnamoyl-CoA Reductase Gene Family for Lignin Synthesis in Alfalfa Plants

Cinnamoyl-CoA reductase (CCR) is a pivotal enzyme in plant lignin synthesis, which has a role in plant secondary cell wall development and environmental stress defense. Alfalfa is a predominant legume forage with excellent quality, but the lignin content negatively affects fodder digestibility. Currently, there is limited information on CCR characteristics, gene expression, and its role in lignin metabolism in alfalfa. In this study, we identified 30 members in the CCR gene family of Medicago sativa. In addition, gene structure, conserved motif, and evolution analysis suggested MsCCR1–7 presumably functioned as CCR, while the 23 MsCCR-likes fell into three categories. The expression patterns of MsCCRs/MsCCR-likes suggested their role in plant development, response to environmental stresses, and phytohormone treatment. These results were consistent with the cis-elements in their promoters. Histochemical staining showed that lignin accumulation gradually deepened with the development, which was consistent with gene expression results. Furthermore, recombinant MsCCR1 and MsCCR-like1 were purified and the kinetic parameters were tested under four substrates. In addition, three-dimensional structure models of MsCCR1 and MsCCR-like1 proteins showed the difference in the substrate-binding motif H212(X)2K215R263. These results will be useful for further application for legume forage quality modification and biofuels industry engineering in the future.     

基于有限元法的行人腿部安全保护研究

为研究现有轿车前保险杠的行人友好性，基于欧洲EEVC WG17标准，建立了行人腿形撞击器的有限元模型，对某型已有量产轿车前保险杠系统进行了小腿撞击器的模拟碰撞试验，分析造成行人损伤的相关因素。针对试验结果。提出保险杠结构改进的合理化建议。为今后轿车前保险杠行人安全性设计提供了可借鉴的方法。     

轴向──反向复合加压胀形工艺的上限分析与实验研究

本文对轴向—反向复合加压胀形工艺进行了上限分析，建立了力学模型及滑移模型，导出了上限载荷的理论计算公式，并与实验结果进行了对比，为该工艺在生产中的推广应用提供了有价值的参考。     

自蔓延—离心法制备的不锈钢内衬复合钢管的力学性能

研究了自蔓延－离心法制备的不锈钢内衬（Ｃｒ１３－１４,Ｎｉ１４－１６）复合钢管不锈钢层的力学性能及热膨胀性能。用扫描电研究了拉伸试样的断口形貌,用透射电镜研究了不锈钢层的组织结构。研究表明,不锈钢内衬与基体碳钢之间热膨胀系数相差较大。不锈钢内衬主要由柱状晶组成,柱状晶为奥氏体,柱状晶间有一薄层铁素体,铁素体区有ＡｌＮｉ金属间化合物析出相,在奥氏体和铁素体有相界有α相析出。     

基于SOA的模具协同系统架构的设计与实现

由于模具设计的复杂性,一副模具的设计通常需要由多个设计人员、多个设计组、多个设计部门甚至多个企业共同完成。模具设计过程中时常发生设计变更,由于设计信息不能及时的传递和更新,这些设计变更常常带来设计数据不一致的问题。因此,建立模具协同设计系统平台,使设计数据可以有效和正确地流动,可以提高模具设计的质量,减少设计的时间和成本。针对传统的面向对象的三层架构的不足,该文通过加入Web服务层,采用面向服务的架构构建模具协同设计系统;详细介绍了该系统四层架构的实现;并通过一个应用实例来说明系统的工作方式。     

煤巷掘进防治煤与瓦斯突出技术及管理

通过分析矿井近年来在突出煤层煤巷掘进过程中的防突技术、管理制度、管理体系,介绍了谢桥煤矿较先进的防突管理体系,总结了其中的技术创新和操作标准化,为煤与瓦斯突出矿井预测预报技术的开展提供参考;同时也可为类似矿井防突工作的管理提供借鉴。