关键词： 汽车   电子机械制动系统   滑膜控制   制动  

摘要： 在汽车的运用过程中，为了实现最佳的制动效果和最大的能量回馈，本文设计了单轮动力学模型，并根据其路面行驶的需要，对相应的滑模控制器进行了设计，对汽车制动过程的安全性和侧向稳定性进行了积极探讨。

关键词： 机械工程   多体系统   动力学  

摘要： 多体系统动力学是近几十年随着航天、航空、机构学、机械制造等机械工程领域发展起来的,用来解决复杂机械系统动力学和运动学问题的高新技术学科。多体系统动力学在先进制造技术中的重要地位和作用,对机械工程中多体动力学的问题研究,能加快国内多体系统动力学的应用与发展,有效地支撑我国的先进机械工程制造。

关键词： 动力机械   钢结构建筑物   振动位移  

摘要： 随着经济的发展,动力机械设备运用到钢结构的建筑,改善了建筑结构,提高建筑结构的性能。文章通过分析了钢结构建筑的特点和钢结构建筑中的动力机械,深入的探析了钢结构建筑中动力机械设备的设计和动力机械在钢结构建筑物中的应用。

关键词： Nickel oxide  

摘要： The hydrodeoxygenation (HDO) of 1-octanol as a model aliphatic alcohol of bio-oil was investigated in a continuous down-flow fixed-bed reactor over gamma-Al2O3, SiO2, and HZSM-5 supported nickel catalysts in the temperature range of 488-533 K. The supported nickel catalysts were prepared by incipient wetness impregnation method and characterized by BET, XRD, TPR, TPD, H-2 pulse chemisorption, and UV-vis spectroscopy. Characterization of supported nickel (or nickel oxide) catalysts revealed existence of dispersed as well as bulk nickel (or nickel oxide) depending on the extent of nickel loading and the nature of the support. The acidity of gamma-Al2O3 supported nickel catalysts decreased with increasing the nickel loading on gamma-Al2O3. n-Heptane, n-octane, di-n-octyl ether, 1-octanal, isomers of heptene and octene, tetradecane, and hexadecane were identified as products of HDO of 1-octanol. The C-7 hydrocarbons were observed as primary products for catalysts with active metal sites such as gamma-Al2O3 and SiO2 supported nickel catalysts. However, C-8 hydrocarbons were primarily formed over acidic catalysts such as pure HZSM-5 and HZSM-5 supported nickel catalyst. The 1-octanol conversion increased with increasing nickel loading on gamma-Al2O3, and temperature and decreasing pressure and WHSV. The selectivity to products was strongly influenced by temperature, nickel loading on gamma-Al2O3, pressure, and types of carrier gases (nitrogen and hydrogen). The selectivity to C-7 hydrocarbons was favoured over catalysts with increased nickel loading on gamma-Al2O3 at elevated temperature and lower pressure. A comprehensive reaction mechanism of HDO of 1-octanol was delineated based on product distribution under various process conditions over different catalysts.

摘要： 备受社会各界关注的京台高速合肥至蚌埠段大修工程从2014年4月开始大规模施工,预计2014年9月底完成合肥至蚌埠方向的改善任务并开放交通.同时,对蚌埠至合肥方向路面开展封闭施工,计划2015年8月底完成.京台高速合肥至蚌埠段大修工程全长105.38 km,北起蚌埠境内仁和集互通枢纽,南至肥东境内的路口互通枢纽.

关键词： ACTIVATION (Chemistry)   IMIDAZOLES   SULFONATES   ANTINEOPLASTIC agents   METASTASIS   CANCER cells   NEPHROTOXICOLOGY  

摘要： Imidazolium trans-[tetrachloridodimethylsulfoxideimidazoleruthenate(III)], NAMI-A, is a promising antimetastatic prodrug with high specificity for metastatic cancer cells. Limited activity of NAMI-A against primary tumor suggests that its use in combination with other anticancer drug(s) might present a more desirable therapeutic outcome. The mechanism of activation and action of this prodrug is still largely unknown. The biological targets, as well, have not yet been delineated. The kinetics and mechanism of interaction of NAMI-A with 2-mercaptoethane sulfonate, MESNA, a chemoprotectant, have been studied spectrophotometrically under pseudo-first order conditions of excess MESNA. The reaction is characterized by initial reduction of NAMI-A and formation of dimeric MESNA as evidenced by electospray ionization mass spectrometry. A first order dependence on both NAMI-A and MESNA was obtained and a bimolecular rate constant of 0.71 ± 0.06 M[-1] s[-1] was deduced. Activation parameters determined (△S[#] = -178.12 ± 0.28 J K[-1] mol[-1], △H[#] = 20.64 ± 0.082 kJ mol[-1] and △H[#] = 75.89 ± 1.76 kJmol[-1] at 37 ± 0.1 °C and pH 7.4) are indicative of formation of an associative intermediate prior to product formation and subsequent hydrolysis of the reduced complex. Our results suggest that MESNA might be able to activate the prodrug while still protecting against toxicity when given in a regimen involving NAMI-A and chemotherapy drug(s) that induce bladder and kidney toxicities. [ABSTRACT FROM AUTHOR]

关键词： 康明斯   装载机   旗舰产品   发动机   挖掘机械   马力  

摘要： 康明斯在上海bauma展上首次展示了为特定应用市场量身定制的专属动力系列新品——QSF3.8(10-17t挖掘机、4-10t叉车专属动力)、QSB7(20-30t挖掘机专属动力)全电控非公路用三阶段发动机,同台展示的还包括QSF2.8至QSX15非公路用轻、中、重型全系列发动机,排放技术先锋的代表产品Tier 4Final QSL8.9发动机,康明斯大马力的旗舰产品QSK60发动机,以及先进的康明

关键词： 铁路机械设备   信息化   管理系统  

摘要： 随着运输科技的飞速发展,铁路运输越来越被人们重视,并逐渐成为社会科技发展的标志。铁路提速、载重提高等高新技术不断取得突破,这就要求铁路相关机械设备以及检修质量不断提高,以适应铁路运输的高速发展。本文通过运用现代信息技术,对铁路机械动力设备技术信息管理系统进行分析,获得其应有的应用效果。

关键词： Epigenetics   MODIFICATION   EQUIPMENT   Epigenetic Change   machinery   stress tolerance   Histones   abiotic stress  

摘要： Abiotic stress induces several changes in plants at physiological and molecular level. Plants have evolved regulatory mechanisms guided towards establishment of stress tolerance in which epigenetic modifications play a pivotal role. We provide examples of gene expression changes that are brought about by conversion of active chromatin to silent heterochromatin and vice versa. Methylation of CG sites and specific modification of histone tail determine whether a particular locus is transcriptionally active or silent. We present a lucid review of epigenetic machinery and epigenetic alterations involving DNA methylation, histone tail modifications, chromatin remodeling, and RNA directed epigenetic changes.

关键词： 工程机械   液压系统   动力匹配   控制  

摘要： 随着科学技术的快速发展，越来越多的工程机械投入到工程建设当中。其中工程机械液压动力系统的优化匹配控制技术就集合了目前多种理论与技术的一项高级系统技术。本文结合笔者多年的从业经验，阐述了传统的技术设计，详细分析了工程机械液压系统动力匹配的机电一体化控制技术，就控制技术中的设计重点进行探讨，以供同行参考与借鉴。