宝来1.8T轿车独立点火线圈检测方法

一汽-大众宝来1.8T轿车点火系统采用独立式点火线圈,其故障是该款轿车点火系统常见的主要故障。详细介绍了独立点火线圈故障的诊断方法,即一般首先进行自诊断故障信息的检测以提取故障码,初步确定故障范围,然后检测点火系统主要的功能部件以最终确定故障。给出了应用所介绍的检测方法进行检测的具体实例。     

车用发动机球铁曲轴的质量控制

为提高车用发动机球铁曲轴生产技术水平，从铁水的熔炼及炉前处理、造型工艺、浇注一冷却工艺、曲轴强化等方面，对国内外曲轴铸造工艺进行了分析比较。介绍了获得纯净铁水的熔炼方法、铁水的球化处理方法及球化剂的配比、孕育处理方法、铜与钼合金的配合使用方法等。     

无缸套汽车柴油发动机缸体材料的研究与应用

研究了孕育剂和合金元素对灰铸铁性能的影响。试验结果表明：在灰铸铁中加入0．2％～0．25％Cr和0．4％～0．5％Cu，采用60％BaSi 40％SiFe复合孕育剂孕育处理。可以使灰铸铁强度到达250MPa以上。灰铸铁的硬度提高。组织均匀性得到改善。用所研制的铸铁材料制造的无缸套缸体具有良好的强度指标和硬度指标。经激光处理后。缸体具有良好的耐磨性。     

铁谱分析在机械设备监测诊断中的应用

基于微粒分析的铁谱技术不仅可以用于磨损机理的研究，而且能对机械设备进行监测和故障诊断。分析了铁谱仪的工作原理及磨损磨粒形式，对这一机械磨损监测诊断的新领域有了一个较为清晰的介绍。     

示波器在点火线圈故障诊断中的应用

介绍了用示波器检查初级电流和次级电压波形,通过波形分析诊断出点火线圈的故障。     

喷射悬浮孕育对灰铸铁组织和性能的影响

研究了喷射悬浮孕育工艺对灰铸铁石墨形态,基体组织和力学性能的影响。结果表明：采用喷射悬浮孕育处理的效果好于常规冲入法的孕育效果,其石墨尺寸变小,级别提高,基体细化程度增加,力学性能提高,孕育剂加入量一定时,粒度的大小对孕育效果有明显的影响,而孕育剂粒度一定时,随着孕育剂加入量的增加,孕育效果增大。     

Biogeochemistry of sulfur in a sediment core from the west-central Baltic Sea: Evidence from stable isotopes and pyrite textures

The biogeochemistry of the sulfur cycle in a ca. 5-m-long sediment core from the eastern slope (221 m water depth) of the Landsort Deep in the west-central Baltic Sea was investigated by analyzing the solid phase records of sulfur isotopes and pyrite textures, besides selected main and minor elements. The sediments were deposited during post-glacial history of the Baltic Sea when the basin experienced alteration of brackish (Yoldia Sea, Littorina Sea) and freshwater (Baltic Ice Lake, Ancylus Lake) conditions. The stable isotopic composition of total sulfur was analyzed as a function of depth. In selected samples pyrite (FeS₂), greigite (Fe₃S₄), and barite (BaSO₄) fractions were separated for isotope analyses. Pyrite textures were analyzed by SEM and optical microscopy.Microbial reactions associated with the oxidation of organic matter resulted in assemblages of authigenic sulfide minerals which for the post-Ancylus Lake brackish water environment are dominated by pyrite and for freshwater environments by Fe-monosulfides. The sulfur isotopic composition of the brackish water Littorina Sea sediments (δ³⁴S between −40 and −27‰ vs. V-CDT) is believed to be determined by cellular sulfate reduction rates and reactions involving intermediate sulfur species. The availability of reactive iron and decomposable organic matter as well as sedimentation rate and the chemocline position are important variables upon the δ³⁴S values of sulfides in brackish water environment. The syn-depositional abundance of sulfur and organic matter, and transport of dissolved sulfur species vs. rates of microbial reactions determine δ³⁴S in the freshwater sediments. The upper part of the Ancylus Lake sediments is sulfidized by downward diffusing H₂S and/or sulfate from overlying brackish water sediments. Minor concretionary barite formation in the freshwater sediments is most likely due to the reaction of pore water sulfate diffusing downward from brackish water sediments with barium desorbed from freshwater sediments. The size distribution of pyrite framboids in the brackish sediments indicates that the formation mainly occurred from anoxic pore waters, although some pyrite formation in an anoxic water column cannot be excluded.     

CFG桩在某铁矿石码头堆场中的运用

介绍了CFG桩设计原理及设计计算方法.结合工程实例,介绍其在某铁矿石码头工程中的运用特点,以及工程中的一些主要设计参数和设计中存在的一些问题.     

球墨铸铁管套管工艺改进措施

阐述了传统球墨铸铁管的套管工艺存在的问题，对传统的套管工艺进行革新，克服了传统套管工艺效率低、易划伤铸管内壁的油漆、费用高等缺点。采用带槽垫木代替插装件和平垫木进行套管，根据不同规格铸管确定带槽垫木的尺寸，创新后的套管工艺，年可节省资金约57万元，在节约铸管运输成本方面，有推广价值。     

无机结合料稳定铁尾砂碎石试验研究

铁尾砂是铁矿开采环节的主要固废,其堆放占用土地、影响环境,并威胁附近居民安全。经对铁尾砂碎石混合料采用无机水硬性固化剂稳定后,用于路面基层并进行了试验研究,包括抗压强度、间接抗拉强度和抗冻融性能等,进而分析了无机结合料稳定铁尾砂碎石的适用范围。