关键词： 园林机械   汽油机   动力   草坪滚压机   滚压机  

标准号: LY/T 2157-2013

摘要： 本标准规定了以汽油机为动力的随进式草坪滚压机(以下简称滚压机)的术语和定义、型号编制方法、基本参数、技术要求、试验方法、检验规则、标志、使用说明书、包装、运输和贮存。

关键词： 园林机械   汽油机   动力   手推式草坪梳草机   草坪梳草机   林业  

标准号: LY/T 1608-2013

摘要： 本标准规定了以汽油机为动力的手推式草坪梳草机(以下简称梳草机)的术语和定义、型号编制方法、基本参数、技术要求、试验方法、检验规则、标志、使用说明书、包装、运输和贮存。

关键词： aluminium alloys   martensitic transformations   metamaterials   molecular dynamics method   nanostructured materials   nickel alloys   shape memory effects   superlattices  

摘要： We show that nanoscale epitaxial superlattices (SLs) can be used to engineer the energy landscape that governs the martensitic transformation in shape memory alloys and tune their thermo-mechanical response. We demonstrate the approach using large-scale molecular dynamics simulations of a SL material consisting of alternate layers of a shape memory Ni-rich NiAl alloy and NiAl B2 alloy. The non-martensitic NiAl alloy was chosen to reduce the energy barrier that separates the martensite and austenite phases of the SL and its incorporation leads to a reduction in the thermal hysteresis of the transition. This is a desirable feature in applications involving actuation and our approach represents a generally applicable and powerful avenue to engineer desired behavior in mechanically active materials. (C) 2013 American Institute of Physics. [http://***/10.1063/1.4794819]

摘要： The standard pathway for virus infection of eukaryotic cells requires disassembly of the viral shell to facilitate release of the viral genome into the host cell. Here we use mechanical fatigue, well below rupture strength, to induce stepwise disruption of individual human adenovirus particles under physiological conditions, and simultaneously monitor disassembly in real time. Our data show the sequence of dismantling events in individual mature (infectious) and immature (noninfectious) virions, starting with consecutive release of vertex structures followed by capsid cracking and core exposure. Further, our experiments demonstrate that vertex resilience depends inextricably on maturation, and establish the relevance of penton vacancies as seeding loci for virus shell disruption. The mechanical fatigue disruption route recapitulates the adenovirus disassembly pathway in vivo, as well as the stability differences between mature and immature virions.

关键词： 康明斯   发动机   广西柳工机械股份有限公司   工程机械   下线   路用   柳州   国产  

摘要： 2013年3月14日，随着首台康明斯L9．3升非公路用发动机成功下线。标志着由康明斯与广西柳工机械股份有限公司按50：501；1：例合资成立的发动机制造企业——广西康明斯工业动力有限公司正式投产运营。在庆典现场还同时举行了装备康明斯L9．3升发动机的柳工新动力856装载机发布仪式，两位用户喜气洋洋地接过了新机器钥匙。

关键词： Activation energy   Austenitic stainless steel   Differential scanning calorimetry   Reversion  

摘要： An attempt has been made to understand the kinetics concerning the manufacturing schedule of high strength 304 stainless steel comprising formation of strain-induced martensite in the course of cold rolling (25%) at 0 degrees C and its reversion during annealing in the temperature range of 300800 degrees C for 1h. Increase in reversion with increasing annealing temperature without any perceptible grain growth up to 800 degrees C has been demonstrated by the microstructural investigation. X-ray diffraction analysis has revealed that the 25% cold rolling has resulted in the formation of 20% deformation induced martensite which after annealing at 800 degrees C has been reduced to 8%. Different stages of reversion behaviour have been envisaged by carrying out differential scanning calorimetry. Activation energies of the reactions involved during reversion have been determined by Kissinger method. Results are compared and found to be in good agreement with the published data.

关键词： 多元回归   农用机械总动力   农业增加值   农村居民家庭人均纯收入  

摘要： 客观现象之间的联系往往是复杂的,许多现象的变动都涉及到多个变量之间的数量关系,研究某一因变量与多个自变量之间的相关关系,可用多元回归分析,其中多元线性回归分析是常用的因素分析方法。主要研究农用机械总动力与农业增加值和农村居民家庭人均纯收入之间的关系,对农用机械总动力作影响因素分析。

关键词： tyre   measurement   bicycle   stability  

摘要： Advanced simulation of the stability and handling properties of bicycles requires detailed roadtyre contact models. In order to develop these models, in this study, four bicycle tyres are tested by means of a rotating disc machine with the aim of measuring the components of tyre forces and torques that influence the safety and handling of bicycles. The effect of inflation pressure and tyre load is analysed. The measured properties of bicycle tyres are compared with those of motorcycle tyres.

关键词： 胶原纤维   分子动力学模拟   点突变   成骨不全症   机械性能  

摘要： 现代人对胶原机械性能和结构的理解程度，对于生物医学材料以及纳米技术的应用至关重要。而且，点突变与许多胶原类疾病有关，其中包括成骨不全症（OI）。我们进行一系列传统研究以及能够操纵原子的分子动力学模拟，以便检测点突变对于胶原纤维结构和机械性能的影响，包括甘氨酸到丙氨酸，天冬氨酸，半胱氨酸和丝氨酸的突变以及羟脯氨酸到精氨酸，天冬酰胺，谷酰胺和赖氨酸的突变。

关键词： 高压输电线路   机械手   动力学分析  

摘要： 高压输电线路长期暴露在外,不可避免地会产生输电线路故障,需及时发现、维修。本方案是配套500 kV六分裂输变线路高压特种作业机器人的高压特种作业机械手,对其进行动力学分析仿真。在建立SimMechanics机械手模型的基础上分别进行正向动力学分析和逆向动力学分析。借助Mat-lab图形方式生成机械手系统的三维动画。