A Neural Network Approach on Reverse Engineering Surface Reasoning in the Manufacturing Field

This paper applied the neural network technology to surfacereasoning in reverse engineering and established the neural network computation model. One of the main advantages of reasoning solid surface using neural network is that no knowledge about surface is needed, and the limited measured points on the surface will do sufficiently. This paper listed the related reasoning cases, including the elementary analytical surfaces and freeform surfaces, discussed the various issues occurring during reasoning process and proved the feasibility and efficiency of this approach from theory and practical computing cases. The results show that a neural network is an excellent aided analysis means for surface reasoning in reversing engineering and possesses practical use for the surface that is complex, incomplete and partially worn-out or damaged.     

新型硫木质素复合浆液的研制及其性质研究

在原硫木素浆液的基础上,通过加入适量无机物（Ｄ）可以得到一种新型硫木素复合浆液。与以前的硫木质素浆液相比,硫木素复合浆液强度更高,价格更低廉,浆液胶凝时间更易调控。这种性能优良的新型复合浆液在工程中将有良好的应用前景。     

社会认可与群体规则的激励涵义

分析了被传统经济学理论所忽略的社会认可动机的激励涵义,指出是否能够获得社会认可取决于是否遵从群体规则,并且将社会认可动机融人到企业经理层激励约束问题的经济分析中,引入激励的动机管理来表征对规则的短期均衡的影响,引入改变规则内容的涵义管理来表征对规则的长期动态的影响,建立了一个转轨时期国企领导班子内群体规则的演化模型,显示了规则的动机管理和规则的涵义管理诱发群体规则变迁的效果．     

诗歌在大学英语词汇教学中的运用

为了验证诗歌在英语词汇教学中的有效性，130名大一学生参加了本次词汇教学试验，被分为实验组和对照组。试验前两个组分别接受了词汇前测，以便了解其目标词项知识和英语语法知识。目标词项知识通过基于诗歌的词汇教学活动教给实验组，用传统的教学法教给对照组。之后进行了词汇后测，内容与前测并无区别，统计分析结果表明：实验组的学生前测与后测得分差异显著；实验组学生后测得分明显高于对照组学生，尽管两组学生在前测中并无显著差异。以上研究表明：把诗歌运用于大学英语词汇教学行之有效，且优于传统的词汇教学活动。     

财经新传媒的盈利模式初探

在传统纸质媒体时代,经济资讯成为新闻的一个内容,或以专版或以专刊形式出现。在新的传播手段和载体,如电脑、手机等助力下,经济资讯传播形式变得多样,而电子软件技术的运用,给经济资讯生动灵活的内容注入了生命力。本文要研究的是,财经新传媒时代,经济资讯内容如何变化、形式如何变化、盈利模式如何变化。研究采用的方法是个案法,即选择财经资讯新传媒,如大智慧、万得资讯、掌上网、东方财富网、金融界、上海钢联、生意宝、上证手机报等,看看他们怎么将形式与内容结合起来实现盈利的。     

基于成形过程的闭塞式冷锻工艺优化

针对闭塞式冷锻工艺复杂、单纯在某个成形阶段优化金属填充性和成形力无法使工艺参数达到最佳值的问题,提出了一种基于成形过程的冷锻工艺多目标优化方法.结合有限元模拟技术和正交试验方法,在闭塞式冷锻基本成形阶段使金属填充性达到最佳,实现金属填充性的优化,获得相应的工艺参数组;然后采用目标函数值拟合优化方法研究了飞边槽高度与凸模下压量之间的关系,通过控制飞边槽高度使成形力在最终填充阶段达到最小,实现了成形力的优化,在保证金属填充性最优的前提下获得了新的使成形力最小的优化工艺参数组,实现了金属填充性和成形力的分过程优化,优化得到的工艺参数组与物理实验数据一致.研究结果表明,所提出的方法充分考虑了闭塞式冷锻工艺的成形特点,能更简便、更准确、更合理地实现闭塞式冷锻工艺的参数优化.     

Anti slip security assessment between main cable and saddle of the middle pylon under extreme vehicle loads

The traffic condition of Taizhou Yangtze River Bridge is obtained to a certain extent, according to the traffic investigation nearby Taizhou Bridge. The statistical characteristics of the traffic conditions are acquired by statistical analysis. Simulation of the extreme vehicle loads and the sensitive analysis of load parameters are carried out based on these data complemented, which would guide the determination of the frictional coefficient between the main cables and the saddle.     

Propagation characteristics of arrayed transient electromagnetic pulses

Starting from the uniform disk current model, an analytical solution for the electromagnetic pulse axial energy radiation is derived and a physical meaning then given to the axial energy propagation characteristics of a unit antenna. From this solution, a point-source approximation model in the time domain is introduced. Parameters such as the energy propagation characteristics and beamwidth of the electromagnetic pulse beam radiating from arrayed antenna are analyzed theoretically. An arrayed transient electromagnetic pulse generator is developed incorporating a 23×16 ultra-wideband tapered slot antenna integrated with a Blumlein formation line and photoconductive semiconductor switch. Experiments performed over a 2.5 km range confirm that the arrayed transient electromagnetic pulse can propagate in free space with the specified waveform. Moreover, the field components can be superposed in phase, and the radiation beam can be focused into a single pulse. Results from calculations are in agreement with experimental results within the measurement uncertainties.     

Characteristics and mechanisms of sorption of organic contaminants onto sodium dodecyl sulfate modified Ca-Al layered double hydroxides

A series of calcium aluminum layered double hydroxides (LDHs) modified with sodium dodecyl sulfate (SDS) (Ca/Al-SDS-LDHs) were synthesized by co-precipitation, and characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and elemental analysis. The Ca/Al-SDS-LDHs enhanced sorption of nitrobenzene and naphthalene from water compared with inor- ganic LDH (Ca/Al-Cl-LDH). The sorption isotherms for sorption of organic contaminants onto the Ca/Al-SDS-LDHs were linear for the concentration range tested, which implies that the sorption mechanism is mainly by partition. The sorption of naphthalene onto Ca/Al-SDS-LDH was apparently stronger than that of nitrobenzene, but this order reversed after eliminating the hydrophobic effect of these two contaminants. Because naphthalene is non-polar and nitrobenzene is polar, the results indicate that the Ca/AlSDS-LDHs were selective for polar organic contaminants.     

基于回归分析法的电机控制器散热翅片优化

为提升增程器电机控制器的散热性能,保证其工作的稳定性,采用数值仿真手段,对其散热翅片结构进行了数值优化研究。首先,基于电机控制器的结构与工作参数,利用SOLIDWORKS FLOW SIMULATION模块,搭建准确可靠的散热系统仿真模型。其次,基于上述模型,详细研究散热系统中翅片长度、厚度、宽度对绝缘栅双极型晶体管(insulated gate bipolar transistor, IGBT)结点温度以及进出口压降的影响规律。最后,利用回归分析法对翅片长度、厚度及宽度进行优化设计。研究结果表明,采用回归分析法可有效优化散热系统翅片尺寸,提升系统散热性能,优化后,翅片长度L=7.23 mm,厚度T=1.00 mm,宽度W=7.09 mm,在保持进出口压降相同的情况下,IGBT结点温度由72.29℃降低为71.76℃。