热轧带钢生产状况分析及发展趋势预测

介绍了国内外热轧带钢的生产情况，对目前国内外热轧宽、窄带钢市场需求进行分析，预测未来我国热轧板带钢的发展方向和趋势。     

一种超宽输入范围的自供电系统设计

在电力电子系统中,高电压大电流的主回路的功率器件两端拥有丰富的电能。以输入超宽范围的反激式开关电源为核心,设计一个隔离式直流供电系统。该系统还以可充磷酸铁锂电池为辅助电源,并包含保护电池的电池智能管理系统,且具备双电源自动切换和升压功能。本系统在输入50~700 V之间稳定工作,实现了电能再利用,提高了能源利用率。同时,有效解决了高压主回路和低压控制回路的电气隔离问题,具有广阔的工业应用前景。     

鱼鳞纹及表面粗糙度对铁基非晶宽带磁性能的影响

研究了鱼鳞纹和表面粗糙度对铁基非晶宽带在1 k Hz下铁损和激磁功率的影响。结果表明:有鱼鳞纹存在时,带材的铁损和激磁功率比无鱼鳞纹时都降低了约50%~100%;带材的铁损和激磁功率随着表面粗糙度的增大而升高。     

A shear deformable theory for the analysis of steel beams reinforced with GFRP plates

A shear deformable thin-walled beam theory is developed for the analysis of steel beams reinforced with a GFRP plate to one of the flanges. Starting with the principle of stationary potential energy, the governing equilibrium equations and boundary conditions are formulated for the problem. The theory results in two sets of fully coupled systems of equilibrium equations. The first system describes the longitudinal-flexural response of the system and involves four generalized displacement fields and the second system governs the lateral-torsional response and involves six generalized displacement fields. The resulting coupled systems are then solved numerically for practical problems. Detailed comparisons with three dimensional and shell solutions under ABAQUS show that the present theory provides reliable predictions for displacements and stresses. A comparison with results from a non-shear deformable theory illustrates the necessity of incorporating shear deformation effects in cases involving predominantly twisting responses.     

基于HV9910宽电压的自适应温度高亮度频闪灯

设计了一种基于HV9910的自适应温度宽电压范围的高亮度频闪灯,其利用HV9910的宽电压特性,可在10～50 V宽电压范围内高亮度工作。结合HV9910的LD端及二极管的热敏特性,使其根据内部温度变化调节频闪能量,并利用HV9910的内部电源给微功耗的MK6A12P单片机供电,使频闪灯具有过压保护及多种模式工作的功能。     

A second-order Mehrotra-type predictor-corrector algorithm with a new wide neighbourhood for semi-definite programming

In this paper, we present a new second-order Mehrotra-type predictor–corrector algorithm for semi-definite programming (SDP). The proposed algorithm is based on a new wide neighbourhood. We are particularly concerned with an important inequality. Based on the inequality, the convergence is shown for a specific class of search directions. In particular, the complexity bound is O(√nlog?^?1) for the Nesterov–Todd search direction and O(n log?^?1) for the Helmberg-Kojima-Monteiro search direction. The derived complexity bounds coincide with the currently best known theoretical complexity bounds obtained so far for SDP. We provide some preliminary numerical results as well.     

Identification of optically clear regions of ternary polymer blends using a novel rapid screening method

The application of a rapid screening method for the construction of ternary phase diagrams is described for the first time, providing detailed visualization of phase boundaries in solvent‐mediated blends. Our new approach rapidly identifies ternary blend compositions that afford optically clear materials, useful for applications where transparent films are necessary. The use of 96‐well plates and a scanning plate reader has enabled rapid optical characterization to be carried out by transmission spectrophotometry (450 nm), whilst the nature and extent of crystallinity was examined subsequently by wide angle X‐ray scattering (WAXS). The moderating effect of cellulose acetate butyrate can be visualized as driving the position of the phase boundaries in poly(l ‐lactic acid)/polycaprolactone (PLLA/PCL) blends. More surprisingly, the boundaries are critically dependent on the molecular weight of the crystallizable PLLA and PCL, with higher molecular weight polymers leading to blends with reduced phase separation. On the other hand, the propensity to crystallize was more evident in shorter chains. WAXS provides a convenient way of characterizing the contribution of the individual blend components to the crystalline regions across the range of blend compositions.© 2013 Society of Chemical Industry     

超宽镁合金中厚板材和薄板材的产业化开发

作为21世纪最具潜力的绿色金属材料，镁合金在航空航天、轨道交通、3C、纺织印刷、体育器材等领域得到越来越广泛的应用。本文研究了产业化生产的超宽镁合金中厚板和薄板的组织和性能，结果发现，通过调整热处理制度，可以获得再结晶等轴组织，中厚板性能可满足ASTMB90／B90M-2007标准要求，薄板性能可满足GBT5154—2010标准要求。     

新型宽带全密封刷洗机快速换辊装置

对新型宽带全密封刷洗清洗机快速换辊装置的详细结构进行了阐述和分析,重点阐述了密封原理和快速换辊的原理及结构,并与传统的刷辊更换装置进行比较,体现了该装置的优势与合理性。     

整体式简支板桥纵向裂缝分析

通过对几种不同宽跨比整体式钢筋混凝土简支板桥的ANSYS有限元实体分析,总结出了这类板桥纵向贯通裂缝形成的主要原因。提出在整体式钢筋混凝土简支板桥的设计中,在满足纵向配筋要求的同时,必须增加横向配筋的数量来抵抗不得忽视的横向内力,以防止板桥出现纵向贯通裂缝。