塑木复合材料作为铁道罐车垫木替代材料的研究

通过分析铁道罐车木质垫木运用过程中产生缺陷的原因,提出垫木替代材料的要求,通过性能试验、仿真计算表明塑木复合材料满足铁道罐车的运用需求。     

青藏高原首条电气化铁路兰青铁路设计标准综述

针对兰青铁路增建二线电气化工程中一些特殊典型工点——局界处设置牵引变电所,分区所采用箱式布置方案,节约了用地,减少了工程投资。针对西北地区第一条时速160km对接触网的受流要求高的特点,全线站场均采用了整体刚度好,受力均匀,抗灾能力强的新型硬横跨。归纳总结出时速160km/h电气化铁路工程设计中应考虑和注意的一些问题,为今后类似设计定位起到指导性作用。     

列波兰变压器功率差动保护的探究

提出了改进列波兰变压器传统数字式保护的可行性。目前列波兰变压器仍以二次谐波制动的比率差动保护为主保护 ,励磁涌流的存在使得该保护的可靠性降低 ,而功率差动保护在励磁涌流发生一个周期后就不受其影响 ,故能够快速准确地分辨出区内故障。通过将功率差动保护与其他保护的配合使用 ,在实际系统中可以达到比较理想的结果 ,具有较大的实用价值。     

Electrochemical Studies of the Recognition Interaction of Rhodamine B with DNA

The recognition interaction of rhodamine B (RB) with DNA was studied in pH 7.5 Britton-Robinson (B-R) buffer solution by electrochemical techniques. An irreversible oxidation peak at glassy carbon electrode was obtained at 0.92V (vs. SCE). After the addition of DNA into the RB solution, the peak current of RB decreased apparently without the shift of peak potential. The electrochemical parameters such as the charge transfer coefficient α and the electrode reaction standard rate constant ks of RB in the absence and presence of DNA were determined, which did not change, indicating that a non-electroactive complex was formed, so the concentration of RB in the solution decreased and the peak current decreased correspondingly.     

Hydrothermal Synthesis, Crystal Structure and Electrochemical Properties of Complex Zn（phen）（m-CBA）2（H2O）

A novel complex Zn(phen)(m-CBA)2(H2O) with m-chlorobenzoic acid (m-CBA), 1,10-phenanthroline (phen) and zinc chloride has been hydrothermally synthesized and characterized. Crystal data for this complex: triclinic, space group P1, a = 0.8361(5), b = 1.2455(7), c = 1.3107(7) nm, α = 115.637(8), β = 91.014(9), γ = 104.857(8)o, V = 1.1763(11) nm3, Dc = 1.623 g/cm3, Z = 2, F(000) = 584, GOOF = 1.078, the final R = 0.0453 and wR = 0.1192. Structure analysis shows that the zinc ion coordinates with two nitrogen atoms of one 1,10-phenanthroline molecule, three oxygen atoms from two m-chlorobenzoic acid molecules and one water molecule, giving a distorted square-pyramidal coordination geometry. The cyclic voltametric behavior of the complex was also investigated.     

Development and Evaluation of Gold 3D Cylindrical Nanoelectrode Ensembles

Gold 3D cylindrical nanoelectrode ensembles （NEEs）, 100 nm in diameter and 500 nm in length were prepared by electroless template synthesis in polycarbonate filter membranes, followed by selective controlled chemical etching. The morphology of the nanowires and cylindrical NEEs was imaged by scanning electron microscopy. The protruding nanoelectrodes were in good parallel order. EDX study showed that the nanoelectrode elements consisted of pure gold. The electrochemical evaluation of the 3D electrodes was conducted using the well known [Fe（CN）6]^3-/[Fe（CN）6]^4- couple. Cyclic voltammgrams （CV） show a very low double layer charging current and a higher ratio of signal to background current than 2D disc NEEs. Electrochemical impedance spectroscopy （EIS） indicates that the 3D cylindrical NEEs effectively accelerate the charge transfer process, which is in consistent with the results of CV. The linear relationship with a slope of 0.5 between lg Ipc and lg v shows that linear diffusion is dominant on the 3D cylindrical NEEs at conventional scan rates.     

铁路电气化施工企业清欠工程款浅述

分析了铁路电气化施工企业形成工程款拖欠的原因,并提出了相应的对策。     

八字岭隧道施工方案设计

正在建设的宜万铁路八字岭隧道全长,地质条件复杂,存在岩溶、断层、突水突泥、煤层瓦斯入暗河等不良地质问题。分析了施工过程中需要采用的各种关键技术,针对施工中可能出现的问题,提出了一些措施,以确保工期和质量。     

兰州交通大学

兰州交通大学由1896年创建的西南交通大学(原唐山铁道学院)和北京交通大学(原北京铁道学院)于1958年在兰州分建而成,是我国第三所铁路院校,时名兰州铁道学院。2003年,更名为兰州交通大学。     

变速箱齿轮啮合动力学的数字仿真

变速箱中齿轮传动过程通常分为单齿为啮合区和双齿对啮合区,为了详细研究这一齿轮传动力学过程,在给出双齿对啮合动力学方程的同时,引入了时间系数并制定了算法使其离散化,建立了双齿对啮合的动力学仿真模型。