德铜引进设备资料编译完成

近年来，德铜引进使用的电动轮MTU4000发动机采用了电控高压共轨燃油系统和电子控制技术，具有故障自我诊断与报警等特点，MTU400发动机属国际先进水平的发动机，目前，大批电动轮的MTU4000发动机陆续进入大修期。电控系统既是MTU4000发动机的技术核心，     

矿用小松HM400铰卡发动机散热系统优化研究

某露天铜矿小松HM400铰卡发动机极易出现水温高故障,为解决此问题,该矿山在引擎罩和散热器前端各加装了两台大功率电机风扇,通过“双抽风、双排风”工作模式改善发动机散热效果;同时使用自动化技术,依靠发动机水温来控制风扇转速,让发动机始终保持最佳工作温度;最后使用数字化显示器,让驾驶员更加直观的检测发电量及发动机水温,实现高温报警功能。通过以上技术改造,完全解决了发动机水温高故障,为矿山创造了极大的经济效益。     

矿用小松HM400铰卡发动机散热系统优化研究

某露天铜矿小松HM400铰卡发动机极易出现水温高故障,为解决此问题,该矿山在引擎罩和散热器前端各加装了两台大功率电机风扇,通过"双抽风、双排风"工作模式改善发动机散热效果;同时使用自动化技术,依靠发动机水温来控制风扇转速,让发动机始终保持最佳工作温度;最后使用数字化显示器,让驾驶员更加直观的检测发电量及发动机水温,实现高温报警功能。通过以上技术改造,完全解决了发动机水温高故障,为矿山创造了极大的经济效益。     

活塞冷却喷嘴失效引发的发动机故障核心探索和分析

经济社会的不断发展,为社会的整体进步带来了积极的推动作用。随着人们购买车辆需求量的加大,汽车生产商为了更好地满足用户多样化的需求,在发动机的生产研制中投入了更多的精力。结合现阶段不同车型发动机的使用现状,可知它过高的故障率影响着用户的正常使用,降低了车辆的正常出行。技术人员通过对发动机故障产生原因的分析,发现其中的活塞冷却嘴失效影响着车辆发动机的正常使用。本文将对活塞冷却喷嘴失效引发的发动机故障核心进行必要地探索和分析。     

汽车发动机机油液面升高的原因分析

在厂矿企业、建筑、水利工程等方面广泛应用大通牌 15ｔ自卸汽车 (如ＳＨ3 2 81-Ｄ、ＳＨ3 2 81Ａ -Ｄ等 ) ,它装用 613 5系列柴油机 .大宝山矿业有限公司从 1982年 12月开始使用这种车型 ,使用中发现 ,有些较残旧的车辆会出现发动机机油液面升高的现象 ,为了使这种故障能得到及时处理 ,本文结合使用实践 ,对大通牌 15ｔ自卸汽车发动机机油液面升高的原因及其判断方法进行分析 ,供同行参考 .1　故障现象所谓“发动机机油液面升高” ,是指车辆在使用过程中 ,在没有人为补充机油的情况下 ,机油中混进燃油或冷却水等液体而使机油液面升高的现象…     

康明斯K2000E发动机电控系统故障诊断及处理

康明斯K2000E发动机采用电子系统进行控制,发动机出现机械故障时,可直接读取故障代码发现故障原因,进行处理。当发动机出现电控系统故障时,修理人员会出现故障判断失误,因此进行故障处理时要采用正确的思路和方法。     

发动机曲轴油封接触面磨损的处理

本文详细地介绍了在发动机修理过程中,遇到曲轴的油封接触表面出现过度磨损情况,导致发动机运行时存在不同程度的润滑油泄漏故障,通过分析不同的曲轴油封结构及磨损程度,采取了直接修磨、油封错位安装、安装耐磨套等方法,经过跟踪发动机修理运行使用情况,效果良好。     

浅析汽车发动机排气放炮、功率下降的起因

汽车点火系断电器触点经常被烧蚀,造成发动机排气消声嚣放炮,废气排放严重,功率下降的故障.本文通过研究分析了发动机出现这些故障的原因,消除了由此而引起的故障.     

汽车发动机机油压力偏低故障原因及解决方法

发动机润滑系统对发动机的正常工作起着至关重要的作用,发动机机油压力低只是系统故障的最终表现形式,其结果可能导致活塞、曲轴及其大小瓦等发动机零部件的损伤.为了防止这种故障的发生,本文以康明斯C系列245发动机机油压力低故障为例,对造成发动机机油压力低的原因进行研究,并提出相应的解决办法.     

日野汽车发动机烧瓦原因与缸体修复

论述日野汽车发动机烧瓦的故障及原因，并介绍缸体主轴承盖修复的工艺。     

单片系统机在高温步进梁式粉末冶金烧结炉中的应用

介绍了该研究所研制的由单片系统机控制的SJ100高温步进梁式粉末冶金烧结炉的程序控制及多温区温度控制。与系统微机相比,其功能与价格比较高,与常规继电器程控系统及普通仪表控温系统相比,可靠性高,紧凑体积小。整个烧结炉自动线是在可控气氛中完成进料、脱蜡、高温烧结、冷却出料及料盘返回等工艺程序,接近80年代国际先进水平。     

改进型高铬铸铁篦条的研究

烧结机炉篦条的主要失效形式是烧蚀和折断.为了提高炉篦条的强度和耐蚀性能,对其成分进行优化设计.高铬铸铁中加入适量的Al和Si,以提高其抗氧化性,此外还加入适量的B、Ar和Y,使其组织细化,有利于高铬铸铁力学性能的大幅度提高,最终提高高铬铸铁篦条使用性能.此外,篦条制造中还采用了过滤处理工艺,以减少铸造组织中的夹杂物数量,提高铸铁的强度、韧性和抗氧化性.国产改进型高铬铸铁篦条在450m2大型烧结机台车上使用,篦条消耗9～12 g/t,使用寿命超过3年.     

微细粒浮选柱的研究现状及其新进展

介绍了浮选柱的历史及近年来浮选柱及其相关技术的发展现状。针对现有浮选柱的缺点,提出了一种新型电浮选柱的设计思想,并阐述了电浮选柱的特点和相关试验研究,表明该电浮选柱在微细粒矿物浮选领域具有其独特的技术优势和广阔的应用前景。     

C490CL高强车轮用钢的开发与生产实践

在C380CL车轮用钢化学成分的基础上,添加铌、钛微合金元素,针对其化学成分制定控轧控冷生产工艺,开发了高强度汽车车轮用C490CL钢。经检验C490CL热轧卷板的力学性能、冷弯性能完全满足相关标准要求;显微组织为P+F、P约占10%,晶粒度、带状组织、夹杂物控制良好,已交付车轮生产厂家使用,用户反馈产品的各项性能良好。     

The effects of D-23129, a new experimental anticonvulsant drug, on neurotransmitter amino acids in the rat hippocampus in vitro

Recent literature continues to promote the early use of disease-modifying antirheumatic drugs (DMARDs), especially the less toxic agents such as hydroxychloroquine. Reports of combination DMARD treatments have been disappointing, and careful attention must be paid to clinical trial design if the efficacy of combination therapies is to be established. Methotrexate retains its prominent role, and its mechanism of action has been the subject of many reports; its toxicity remains the most common reason for treatment termination. Guidelines for monitoring hepatic toxicity of methotrexate have been published and may help reduce the need for invasive biopsy procedures. Significant risk factors for methotrexate pulmonary toxicity remain difficult to identify. Large placebo-controlled studies of both sulfasalazine and hydroxychloroquine have been reported and have demonstrated the efficacy of these agents in the treatment of early rheumatoid arthritis. Awareness of drug-toxicity profiles is important for physicians who prescribe these agents.     

Mitoxantrone in the treatment of acute myelogenous leukemia: a review

Mitoxantrone is an intravenous anthracenedione structurally related to the anthracycline antibiotics. This drug has been used for several years in the treatment of acute myelogenous leukemia (AML). Its use has been based on its pharmacological properties, its incomplete cross-resistance with other intercalating agents, and its better tolerance as predicted by preclinical studies. Various treatment schedules, using mitoxantrone alone and in combination with other antileukemic agents, have been used in clinical trials. Complete remission (CR) rates ranged from 14 to 44% in refractory AML and from 46 to 79% in relapsed patients. Although a superiority of mitoxantrone over anthracyclines has not been clearly demonstrated in newly diagnosed patients, mitoxantrone is now recognized as a useful drug in first line therapy. The tolerability profile of mitoxantrone indicates that it offers patients an acceptable quality of life compared with standard treatment regimens, and could be a good alternative to the anthracyclines. The development of new therapeutic concepts aiming at an optimization of its use is now in process and first results are promising.     

Molecular biology of phospholipid transfer protein

Lipid transfer proteins play an essential role in the intravascular dynamics of lipids among lipoproteins and between lipoproteins and cell membranes. Phospholipid transfer protein has been known for over a decade but, unlike cholesteryl ester transfer protein, has been investigated relatively little with regard to its physiological importance. The recent determination of the phospholipid transfer protein complementary DNA sequence as well as the further characterization of its gene structure will direct future studies toward the understanding of its structure-function correlations, physiological regulation, and clinical assessment at the molecular level. As a member of the lipid-transfer lipopolysaccharide-binding protein gene family, phospholipid transfer protein will attract investigators to studying its possible involvement in lipopolysaccharide or endotoxin interactions in addition to its phospholipid transfer activity.     

直接还原铁在我厂电弧炉炼钢中的应用及效果分析

概述了直接还原铁的特性及在我厂电弧炉炼钢中的使用情况，并将其效果作了进一步分析。     

An assessment of the biochemical applications of the non-ionic surfactant Hecameg

A number of properties and effects of the novel non-ionic detergent Hecameg (6-O-(N-heptylcarbamoyl)-methyl-alpha-D-glucopyranoside) have been examined in view of its possible biochemical applications. In particular, its critical micellar concentration has been measured, and its effects on pure lipid membranes, soluble and membrane-bound enzymes have been recorded. Hecameg has some advantageous and some less advantageous properties; its relatively high critical micellar concentration (16.5 mM), almost insensitive to pH or ionic strength changes, makes it suitable for reconstitution procedures in which detergent must be removed by dialysis. It is also an effective lipid-solubilizing agent, producing leakage of vesicle contents at detergent concentrations well below the solubilizing range. Among the drawbacks, the presence of an amide group in the molecule may interfere with the protein amide group in spectroscopic measurements. It also appears to be less gentle than other nonionic surfactants towards certain enzyme activities.     

Antigenic activity of angiotensin II and its fragments

The antigenic activity of angiotensin and its seven fragments has been studied in cross-reaction with specific antibodies, elicited to angiotensin and its fragments: C-terminal hexapeptide and middle tetrapeptide. It has been found that all the fragments studied possess certain affinity for antibodies elicited to angiotensin, C-terminal hexapeptide and middle tetrapeptide. The middle tetrapeptide was identified to be the immunologically active centre of the angiotensin molecule.