向阳水轮泵站BS100—8型水轮泵结构的技术改造

介绍了该站对BS100—8型水轮泵的三次技术改造。通过用塑料轴承代替金属轴承;把轴承室改安置到水面上;将钢板焊接的串联弯管改为铸铁件;在洪水位上、泵站顶设钢筋混凝土梁支承轴承盒等方法,降低了机组成本,改善了轴承的运行条件,延长了机组零件的使用寿命,减轻了检修人员的劳动强度,取得了较好的社会社益和经济效益。     

高效率的D100—8型水轮泵

向阳水轮泵站于1971年建成,正常工作水头4.1m,原在左岸安装了BS80—8型水轮泵2组4台,净扬程47m,右岸安装BS100—8型水轮泵3组6台,净扬程58.4m,灌溉面积2.05万亩,由于水轮泵长时间运行,效率逐年下降。     

S-玻纤织物增强复合材料层合板的冲击损伤特性研究

通过空气炮冲击实验装置、渗透剂增强的Ｘ射线照相法和高强光背射法分析了Ｓ－玻纤织物增强复合材料层合板的冲击损伤特性,研究了冲击速度、铺层角、弹丸质量变化时材料的破坏机理与特征,其研究结论对抗弹复合材料的进一步研究与应用具有指导意义。     

荧光光度法选择性测定水样中痕量镉的研究

本文研究了镉 (Ⅱ ) 8 羟基喹啉 5 磺酸 溴代十六烷基三甲胺体系测定痕量镉的荧光分析方法。Cd(Ⅱ )与 8 羟基喹啉 5 磺酸 (HQS)在强碱性条件下能选择性地形成稳定的配合物 ,发射较强的荧光 ,激发波长和发射波长分别位于 394nm和 5 2 0nm。在溴代十六烷基三甲胺 (CTMAB)表面活性剂存在时 ,络合物的荧光强度显著地增强。在碱性条件下 ,CTMAB浓度为 3× 1 0 3mol/L时 ,镉 (Ⅱ )的浓度在 4 3× 1 0 9～ 6 0× 1 0 6 mol/L范围内线性关系良好 ,检出限为 4 3nmol/L。应用本方法测定生活及环境水样后 ,共加标回收率为1 1 7 1 %～ 1 2 1 8%。本方法操作简便、选择性好、准确度高 ,可直接应用于水样品中镉含量的测定 ,结果令人满意     

AV100-19轴流式鼓风机扩容改造流道与叶片的优化设计

利旧改造一台AV100-19轴流式鼓风机,通过设计计算增大流道外径、改变叶型、增加反动度,等技术手段,达到提高鼓风机风量、风压、优化风机性能的目标,满足新高炉的送风要求.     

红山公司GCU-100型动态电子轨道衡在我公司的使用

<正>秦皇岛港股份有限公司铁路运输分公司(以下秦港铁运)拥有全国最大的港管铁路,主要设施、设备有12个分区车场,21台内燃机车,175辆铁路自备车,190km铁路线路。主要担负秦港     

基于响应曲面法的Aermet100磨削力预测模型研究

为了优化超高强度钢Aermet100磨削参数,采用响应曲面实验法,对Aermet100平面磨削力展开了预测模型研究,建立了磨削力的全系数项回归预测模型;采用显著性检验方法,对磨削力预测模型的显著项和不显著项进行了分析,去除了不显著项,对磨削力预测模型进行了简化;基于所建模型,分析了磨削参数对磨削力的影响规律。结果表明:简化的磨削力预测模型误差小,可对磨削力进行有效预测;磨削深度ap与工件速度vw、砂轮速度vs的交互作用对磨削力影响显著;磨削力随着工件速度vw、磨削深度ap的增加而增加,随着砂轮速度vs的增加而降低。     

8-羟基喹啉锆的制备及摩擦学性能研究

以8-羟基喹啉和硝酸锆为原料在乙醇-水溶液中合成一种亮黄色的锆配合物,并用元素分析、XRD、红外等分析手段对其结构进行表征。结果表明,锆配合物为Zr(C9H6NO)4,是一个晶体结构的物质。用MRS-10A型四球机测试Zr(C9H6NO)4在液体石蜡中的摩擦学性能,结果表明,Zr(C9H6NO)4能显著改善液体石蜡的抗磨性能,提高液体石蜡的极压性能,Zr(C9H6NO)4质量分数为0.1%时可使磨斑直径降低24%,质量分数为0.2%时可使承载能力提高29%。采用SEM和EDS分析磨损表面形貌和元素组成,其抗磨作用机制为:在摩擦亚表面形成摩擦扩散层,使得摩擦表面的润滑状态得到明显的改善。     

1—酰基—5—芳基双缩脲类化合物的质谱研究

本文报道了14个新的1-酰基-5-芳基双缩脲类化合物的电子轰击质谱。根据高分辨质谱及联动扫描质谱揭示了该类化合物的质谱裂解途径,结果表明该类化合物出现较强的分子离子峰及特征的基峰[ArNCO]~ 。     

基于故障树对某空空相互坐标测定系统的模糊故障诊断

本文将故障树和模糊数学的方法引入到某机载设备的性能故障诊断中．建立了以诊断矩阵为基础的模糊诊断模型．并实现在计算机上进行故障诊断,从而为机载设备性能故障诊断提供了一种科学而行之有效的方法。     

工序质量控制系统的研究

对工序质量控制系统的实现进行了研究.系统可生成质量控制图表对工序质量进行控制.     

Expression and distribution of S100 protein in the nervous system of the adult zebrafish (Danio rerio)

S100 proteins are EF-hand calcium-binding protein highly preserved during evolution present in both neuronal and non-neuronal tissues of the higher vertebrates. Data about the expression of S100 protein in fishes are scarce, and no data are available on zebrafish, a common model used in biology to study development but also human diseases. In this study, we have investigated the expression of S100 protein in the central nervous system of adult zebrafish using PCR, Western blot, and immunohistochemistry. The central nervous system of the adult zebrafish express S100 protein mRNA, and contain a protein of approximately 10 kDa identified as S100 protein. S100 protein immunoreactivity was detected widespread distributed in the central nervous system, labeling the cytoplasm of both neuronal and non-neuronal cells. In fact, S100 protein immunoreactivity was primarily found in glial and ependymal cells, whereas the only neurons displaying S100 immunoreactivity were the Purkinje's neurons of the cerebellar cortex and those forming the deep cerebellar nuclei. Outside the central nervous system, S100 protein immunoreactivity was observed in a subpopulation of sensory and sympathetic neurons, and it was absent from the enteric nervous system. The functional role of S100 protein in both neurons and non-neuronal cells of the zebrafish central nervous system remains to be elucidated, but present results might serve as baseline for future experimental studies using this teleost as a model.     

Study on the influence of geometric errors in rotary axes on cubic-machining test considering the workpiece coordinate system

Evaluating the influence of geometric errors in rotary axes is a common method used by a five-axis machine tool for improving the machining accuracy. In conventional geometric error models, the table coordinate system is considered as the final workpiece coordinate system. In this study, an additional workpiece coordinate transformation was proposed to identify the influence of geometric error. First, a cubic machining test was conducted. Second, the necessity of workpiece coordinate transformation was analyzed, and a method for coordinate transformation was proposed. In addition, both machining simulation and an actual machining experiment of the cubic machining test were conducted to verify the efficiency of the proposed method. The results indicate that the workpiece coordinate transformation is an essential part of the geometric error model for accurately simulating the geometric error influence. The method for identifying the geometric error influence considering the workpiece coordinate transformation is applicable in manufacturing.     

Location tracking scanning method based on multi-focus in confocal coordinate measurement system

Confocal microscopy is high precision and widely used method for topography measurement. The surface height information is obtained by peak extraction of the axial response signal (ARS) which axial tomography of the surface is required. Therefore, when scanning large-diameter surfaces with a confocal coordinate measuring system (CCMS), the relative horizontal scanning trajectory (RHST) between the confocal sensor and surface is repeated and time-consuming step motion, which greatly increases the measurement time. To improve the scanning measurement efficiency of CCMS, we propose a new location tracking scanning (LTS) method based on multi-focus. In the LTS method, the RHST is a continuous linear motion during the process of axial tomography, and the horizontal motional surface is located and tracked through a series of focuses to restore the ARS. A generatrix profile of a spherical surface is measured to verify the effectiveness of the proposed method, and the results show that the scanning measurement time can be reduced by more than 90% without loss of accuracy of the profile measurement.     

临界区加速冷却对X100管线钢组织性能的影响

采用热模拟技术、显微分析方法和力学性能测试等手段,对X100管线钢在(α+γ)临界区加速冷却工艺下组织性能的变化规律进行研究。结果表明,通过临界区的加速冷却方法,可使X100获得(B+F)双相组织。这种双相组织使得X100管线钢具有连续屈服的能力,表现为高的初始应变硬化倾向和大的均匀变形能力。在初始加速冷却温度为830～850℃时的加速冷却,使得X100具有高的强度、塑性、形变强化指数、韧性和低的屈强比,表现出了优良的强韧水平。此时形成的以细小的贝氏体为主,辅以少量细小、高密度位错的铁素体的组织结构赋予了材料高的强韧特性。研究还表明,随初始加速冷却温度降低,铁素体体积分数增加,引起材料强度的降低和形变强化指数的增加。     

坐标系旋转在加工圆锥面上孔系的应用

通过实例说明在数控加工中,通过工件坐标系旋转加工圆锥面上孔的方法。     

面向先进制造系统的小批量统计质量控制的研究

分析了传统控制图应用于先进制造系统面临的问题，提出一种新的基于小批量生产环境的质量控制图，它采用了可变的控制界限，不管样本数量多少，都能使误发警报概率保持较小的定值，从而避免了错误的频繁报警，无谓的停机检查和多次调整，提高了控制图对生产工序的监控效率。     

逆向工程中线激光-机器视觉集成坐标测量系统研究

将立体视觉和线激光扫描传感器集成到三坐标测量机（CMM）下，由立体视觉来获得物体的边界或轮廓信息、线激光扫描传感器获得物体表面的三维数据，利用多传感器的信息融合技术对三维数据进行分割，提取被测物体的几何特征，并在此基础上构建物体模型。多传感器集成坐标测量系统避免了单一传感器的局限性，从而为非接触测量系统在逆向工程中的应用开辟了新的途径。     

Minimum zone evaluation of sphericity deviation based on the intersecting chord method in Cartesian coordinate system

Along with the developments of manufacturing and machining technology, spherical parts with high-precision are widely applied to many industrial fields. The high-quality spherical parts depend not only on the design and machining techniques but also on the adopted measurement and evaluation approaches. This paper focuses on the minimum zone evaluation model of sphericity deviation in Cartesian coordinate system. A new method, i.e. intersecting chord method, is proposed to solve the problem of constructing 3 + 2 and 2 + 3 models of the minimum zone reference spheres (MZSP). The modelling method employs intersecting chords rather than characteristic points to construct the geometrical structure of evaluation model. Hence, the efficiency of processing data is improved without compromising the accuracy of deviation evaluation. In the modelling process, the two concentric spheres of minimum zone model are simplified as an intersecting chords structure, the virtual centre generated by the intersecting chords can be used to judge whether the searched object is the maximum object or not, which decrease the positioning error of the minimum zone centre and reduce the difficulty of constructing models. To test and verify the performances of intersecting chord method, two experiments are performed to confirm the effectiveness of the proposed method, and the results indicate that the proposed method is more trustworthy against accuracy and computation time than other methods required to achieve the same results.