推进郑洛新自创区汽车产业集群发展的重要性分析

总结了产业集群发展在节约成本、利于区域品牌的创立和保持、利于提升区域竞争力、以及利于培育高新技术企业和提升创新能力等方面的优势,从汽车产业创新发展的需要、汽车产业在我国经济发展中的地位、以及汽车产业在郑洛新自主创新区的地位要求等方面阐述了推进郑洛新自创区汽车产业集群发展的重要性。     

Negative impacts of diamond magnetism on the microstructure of co-deposited composites and the effective solution

In a paper, we reported that incorporation of diamond into composite coatings could cause microstructural deteriorations (e.g., roughening the coating surface, coarsening the matrix grain and reducing the mechanical retention of diamond grains in the matrix), and suggested that all the impacts were caused by diamond magnetism resulting from metallic inclusions trapped in it. To confirm this, further microstructural observations were conducted on composites containing diamond particles that experienced different treatments before being planted, i.e., magnetization (strengthening diamond magnetism by a strong magnet) and demagnetization (weakening diamond magnetism by an alternating magnetic field), as well as on composites fabricated in the presence of an external alternating magnetic field in the vicinity of the cathode. It is shown that advance demagnetization treatment reduces the impacts while advance diamond magnetization treatment does the opposite. Moreover, the impacts could be more effectively reduced by superimposition of the external alternating magnetic field which may exert effects not only on demagnetization of the diamond grains, but also on cations' deposition process since the external magnetic field is much stronger than that produced by diamond.     

基于小波变换与Elman神经网络的短期风速组合预测

风速的准确预测对风电场发电系统的经济和安全运行有着重要的作用。为了克服风速随机性强的缺点,提高短期风速预测的精度,提出了一种将小波变换与Elman神经网络相结合的短期风速组合预测模型。该模型由小波预处理模块和神经网络预测模块组成。首先利用小波预处理模块将风速序列作多尺度分解,重构得到不同频段的子序列,然后利用Elman神经网络模块分别对其训练和预测。实际风速预测结果表明,与单一的Elman和ARMA法相比,该组合预测模型的预测精度有较大的改善,可以用于风电场短期风速的预测。     

远程供水测控终端系统的设计

介绍了一种新型的铁路沿线供水远程测控系统设计方案，可以对供水站点设备进行远程监测，同时还可对设备进行控制。详细设计了远程测控终端系统的硬件电路和软件。系统由监控中心（上位PC机）和分布在供水现场的下位机单片机系统组成。两部分之间通过RS485／以太网转换模块经以太网进行通信。充分体现该系统设计的灵活性和可扩展性。其实际应用结果表明：该系统可靠性高，运行稳定，具有很强的实用推广价值。     

金刚石的嵌入对其复合镀层的影响分析

金属-金刚石共沉积复合镀层,在不同应用领域(如提高耐磨性、自润滑性、切削性及弥散强化效果等)已得到广泛关注.详述了金刚石的嵌入对复合镀层的影响及其原因.试验发现,金刚石的嵌入恶化了复合镀层胎体的微观结构,使得胎体晶粒粗化、镀层和颗粒结合部出现间隙、镀层表面起伏不平并出现节瘤、沟谷及金刚石颗粒表面的过度包镶等现象.分析发现,以上现象是金刚石晶体内部金属包裹体的磁性,对运动的阳离子产生洛仑兹力作用,从而影响电沉积过程的结果.     

提高钎焊金刚石工具质量的研究进展

详细地介绍了当前国内外钎焊工具的研究进展,主要包括:钎料组分选用,激光钎焊,表面镀覆金刚石的采用,钎焊工艺条件的优化,磨粒均匀/有序排布的实现,钎焊内应力的消除等,最后提出了目前亟待解决的问题。文中对众多的钎料合金,按照钎焊结合的实现原理,分成了两大类,即碳化钛类和碳化铬类,比传统的以合金组分划分显得更为简单而清晰。在新工艺方面着重介绍了采用激光束作为热源进行钎焊,激光钎焊加热速度快,能有效降低金刚石石墨化进程,而且能避免整体加热时工件易变形的特点。     

Effects of saccharin and cobalt concentration in electrolytic solution on microhardness of nanocrystalline Ni-Co alloys

Cobalt content, surface morphology and microhardness of nanocrystalline Ni-Co deposits prepared by pulse plating technique at constant electrodeposition conditions with varied concentration of saccharin and cobalt sulfate in the electrolyte were investigated. It is found that appropriate amount of both additions could lead to finer structure and higher hardness of the deposit and further increase of the concentration could result in decline of the hardness, which is regarded as the result of inverse Hall-Petch relation. The maximum hardness of the Ni-Co alloy deposits is not higher than that of their pure Ni counterparts, indicating that the refinement hardening effect (Hall-Petch relation) is dominant in nanocrystalline Ni-Co alloy deposits. By adding Co ions to the electrolyte, the amount of organic refiner saccharin (responsible for introduction of sulfur and carbon impurities) needed to produce nanocrystalline deposits could be remarkably reduced.     

基于小波包分解和支持向量机的石油套管缺陷智能识别

 针对石油套管缺陷超声无损检测(NDT)中缺陷回波的特点,提出了一种基于小波包分解和支持向量机(SVM)的缺陷智能识别新方法。分析了Gabor、小波和小波包3种信号时频变换分解方法的特点,并进行了基于3种方法生成的特征数据可分性比较,确定了小波包分解方法效果最好。根据SVM解决分类问题的原理,采用SVM法对3种时频分解提取的缺陷信号特征数据进行识别。试验表明,基于小波包分解局部熵的特征提取结合SVM模式智能识别的组合方法,可应用于石油套管上的4种典型缺陷的识别。     

Passive and SMA-activated confinement of circular masonry columns with basalt and glass fibers composites

Fiber Reinforced Polymer (FRP) composites are widely used for strengthening and conservation of historic masonry, even if research problems are still open. The mechanical behavior of masonry columns having a circular cross section, confined with glass and basalt FRP systems was studied in this paper. An extended experimental investigation is presented in order to show the results of axial compression tests on circular masonry columns built with natural blocks (calcareous stone). Active confinement was also studied by using a novel technique that employs Shape Memory Alloys (SMA). Totally twenty-four masonry columns were built, instrumented and tested. Different fibers, strengthening schemes and matrix/adhesive were used for the confinement of the columns.Unstrengthened columns were tested as reference specimens. Axial strain of the columns and tensile strain of the fibers in the direction perpendicular to the primary axis of the columns were measured with the applied load. Experimental results revealed the effectiveness of the FRP-confinement for masonry columns. Active confinement was found to be effective at early loading stages since an increased stiffness of the SMA/GFRP-confined columns was measured.A prediction of the compressive strength was obtained by using the model of the Italian guidelines CNR DT 200 (National Research Council) in order to compare the experimental results with the design approach, also for new types of fiber like basalt which were not included in the technical codes. Finally, the experimental results were compared with theoretical values calculated according with to two existing analytical models in order to test their effectiveness for the analyzed configurations.     

蒸汽爆破技术在烟梗加工中的应用

为了提高烟梗的利用率,在梗丝生产线的不同工序顺序取样进行蒸汽爆破试验,研究了爆破前后各工序梗丝中的木质素、纤维素含量变化及添加爆破梗丝对卷烟的感官品质影响。结果表明:①原梗丝生产线对烟梗中的纤维素、半纤维素和木质素含量无显著影响,但蒸汽爆破后烟梗中的纤维素、半纤维素和木质素含量显著降低。半纤维素的含量降低最多,切梗后含量降低了49.5%。纤维素和木质素的含量变化没有半纤维素明显,但其最大降幅也分别达到了26.5%(润梗后)和26.0%(闪蒸后)。②蒸汽爆破梗丝在卷烟中的添加量从5%增加到30%时,试验卷烟样品仍保持较好的感官品质。