45号钢垫圈断裂的原因分析和改进措施

针对45号钢垫圈在装配后发生断裂的情况,对45号钢垫圈进行断口形貌分析、力学性能分析、化学成分分析和金相组织分析。宏观形貌显示内孔存在加工台阶和明显刀痕,能谱测试发现断裂起始处存在锌元素,金相组织分析确认内孔加工面存在微裂纹。结合加工工艺分析,确认45号钢垫圈的断裂原因,并提出改进措施。     

Unveiling the role of Fe3O4in polymer spin valve near Verwey transition

The spinterface formed between ferromagnetic(FM)electrode and organic materials is vital for performance optimization in organic spin valve(OSV).Half-metallic Fe₃O₄with drastic change in structure,conductivity and magnetic property near Verwey transition can serve as an intrinsic spinterface regulator.However,such modulating effect of Fe₃O₄in OSV has not been comprehensively investigated,especially below the Verwey transition temperature(Tv).Here,we highlight the important role of Fe₃O₄electrode in reliable-working and controllable Fe₃O₄/P3HT/Co polymer spin valves by investigating the magnetoresistance(MR)above and below 7V.In order to distinguish between different contributions to charge transport and related MR responses,the systematic electronic and magnetic characterizations were carried out in full temperature range.Particularly,the first-order metal-insulator transition in Fe₃O₄has a dramatic effect on the MR enhancement of polymer spin valves at 7V.Moreover,both the conducting mode transformation and MR line shape modulation could be accomplished across 7V.This research renders unique scenario to multimodal storage by external thermodynamic parameters,and further reveals the importance of spin-dependent interfacial modification in polymer spin valves.     

A dynamic SVR–ARMA model with improved fruit fly algorithm for the nonlinear fiber stretching process

Natural Computing - The fiber stretching process plays the key role in the process of fiber production and its effects is measured by the stretching ratio. The stretching ratio is determined by the...     

轧制始极片

本文介绍了轧制法生产始极片的工艺，比较了轧制法和传统的钛种板生产始极片的优缺点，讨论了采用轧制始极片的经济效益和应用前景。     

Synthesis of amphiphilic magnetic microspheres by dispersion copolymerization of styrene and poly(ethylene oxide) macromonomer

Amphiphilic magnetic microspheres ranging in diameter from 5 to 100 µm were prepared by dispersion copolymerization of styrene and poly(ethylene oxide) vinylbenzyl (PEO‐VB) macromonomer (MPEO) in the presence of Fe₃O₄ magnetic fluid. The effects of various polymerization parameters on the average particle size were systematically investigated. The average particle size was found to increase with increasing styrene concentration and initiator concentration. It also increased with decreasing stabilizer concentration and molecular weight of MPEO. The content of the hydroxyl groups localized in the microspheres ranged from 0.01 to 0.2 mmol g^?1. © 2003 Society of Chemical Industry     

RFT地层测试器与3700测井系统的配接

文章介绍了如何转换CSU系列地层测试器RFT的上传信号，使其能够适应3700测井系统的采集、处理和记录。从而使CSU系列的地层测试器能够配接3700测井系统。     

项目管理信息系统在西部管道工程中的应用

系统地阐述了西部管道工程信息管理系统的建设和应用，根据实际应用情况提出了有待改进的工作。以西部管道为例，详细介绍了大型工程，特别是大型长输管道工程信息管理系统的建设目标、设计原则、功能特点、整体结构和功能模快组织，以及信息系统对工程项目管理的支持作用，对于改进和提高大型工程信息管理系统的建设和使用，提升大型工程项目管理水平具有积极意义。     

FF现场总线的网段负载能力的设计及计算

从生产安全运行的管理要求；电压压降和电流的限制及信号的衰减；网络运行时间的要求；系统设计的影响；备用能力的考虑等各个方面，结合上海赛科聚苯乙烯项目的具体设计，分析隔爆条件下FF现场总线的H1网段负载能力的设计，以供大家探讨。