基于TDC3000实现的分程控制系统的研究与实践

根据贮罐气封工艺需求,压力高时调节阀放空,压力低时调节阀补N2．同时为了避免两调节阀频繁开闭,将控制器引入死区,实现分程控制,详解实现分程的组态步骤,充分利用TDC3000灵活多样的组态功能来达到优化控制的目的．     

运动汽车图像静态视点平滑特征优化仿真

由于运动汽车图像在特征采集过程中,汽车处于高速运动状态,采集的过程无法与汽车完全同步,造成汽车的特征像素分量在高速运动中丢失,产生较大的像素运动噪声,使得汽车图像边缘高频特征因为运动干扰而模糊.传统的平滑过渡方法在对运动汽车图像进行平滑处理时,按照图像中像元灰度值计算突变特性,但受到像素丢失与噪声无法抑制的影响,无法解决运动汽车图像高频分量对图像像元灰度值的干扰问题.提出基于替身运动DR算法的运动汽车图像静态视点平滑过渡方法,用替身像素描述汽车在场景中的运动特征,替身像素在场景中运动并同其它汽车的替身进行交互,采用局部化的车辆模型提高运动汽车场景的逼真度,通过依据替身运动的平滑过渡算法完成归一化线性运动汽车图像静态视点的平滑过渡,解决了运动汽车图像的平滑过渡问题.实验结果说明,所提方法可确保运动汽车图像边缘锐化,有效处理平滑噪声和锐化边缘.     

相转移催化合成癸二酸二甲酯

使用相转移催化剂BTEAC(氯化三乙基苄胺 )合成癸二酸二甲酯。条件为 :10g癸二酸 ,80mL甲醇 ,0 .5mL硫酸 ( 98% )和 0 .0 5gBTEAC。癸二酸二甲酯产率达到 90 .4 %     

全媒体时代新闻学专业实践教学模式的研究

全媒体时代,需要全媒体型新闻传播人才。新闻学专业教育者,要顺应时代要求,转变教育、教学观念,不断探索教学模式,加大实践教学内容比重,使课堂理论知识和实践教学环节相融合。营造多层次的实践平台,注重单项实践与综合实训相结合,增加"双师型"的教师比例,提高实践教学质量。     

基于MSP430单片机的灾害性天气预警管理系统设计

设计了基于MSP430单片机的灾害性天气预警管理系统,针对常见的雨量、风速及温度自然因素实现实时的监测,并对数据进行分析和处理,设置出相应的警报等级,并能根据警报的等级控制相应的三路设备。     

基于校园门户网站新闻通知推送服务的研究

针对校园门户网站新闻通知不到位,存在缺陷,利用率低,服务效率低的现状,研究未来可以提升的优势以及展望未来发展方向。并着重考虑了在非网络环境下,以简单快速为目的把校园新闻,校园公告传送给每位老师的设计思路。为校园门户网站运行提高效率的部分技术提出一种可行务实的解决方案。     

A novel electroless silver depositing method for magnesium alloys

Depositing silver on magnesium alloy by both electroless plating and organic coatings was studied. The organic coating was made by immersing samples in organosilicon heat-resisting varnish. In this method the organic coating acts as interlayer between the substrate and silver film. When the reaction starts, silver deposits directly on the interlayer. X-ray diffraction and SEM analysis were used to determine the composition and morphology of the interlayer and silver film. The potentiodynamic polarization curves for corrosion studies of coated magnesium alloys were performed in a corrosive environment of 3.5% NaCl（mass fraction） at neutral pH （6.9）. The results indicate that compared with the substrate, the corrosion resistance of coated magnesium alloys increases greatly. Moreover, the method proposed in this work is environmentally friendly, non-toxic chemicals were used. In addition, it provides a new concept for the corrosion inhibition of magnesium alloys.     

Temperature stability and fracture toughness of Nd-Fe-B magnets

Temperature stability and toughness of magnets are very important properties especially for application in motor. In this paper, it is found that temperature stability and toughness of magnets are improved when Fe is substituted with Co andheavy rare earth is substituted for Nd in part and suitable rich B grain-boundary phase is added. In addition, heavy rare earth substitution decreases the remanence temperature coefficient greatly, but has a little effect on Curie temperature of the magnets, which is beneficial to Nd-Fe-B magnets for the application in motor.     

Sr对高铁Al-Si合金组织和性能的影响

研究了Sr元素（加入量分别为0．03％、0．06％、0．09％、0．12％和0．18％）对含Fe量为1．2％的ZL102合金的组织和性能的影响。研究发现，随着Sr元素的加入，合金中粗大的针状Fe相开始出现断裂分叉现象，同时针状Fe相的长度也随Sr元素加入量的增加而减小，但Sr对Fe相的针状形貌没有明显改变。随着Sr元素加入量逐渐增加，合金的抗拉强度和伸长率均呈现出先增后减的变化趋势。当Sr元素加入量达到0．12％时，合金材料的综合力学性能最佳。     

Performance of positive and negative electrodes in amorphous manganese oxide supercapacitor

Using potassium permanganate and acetic manganese as the reactants, amorphous manganese oxide was prepared with mechanochemical method. XRD was used for microstructure characterization, while cyclic voltammetry and constant current charge-discharge were used for electrochemical performance testing. The positive electrode （PE） and negative electrode （NE） were investigated respectively in amorphous manganese oxide supercapacitor, aiming to find their different performances in charging-discharging. The results show that the crystalline structure is destroyed in both the PE and NE material during charge-discharge process. Thereinto, the NE suffers a bit more seriously. When cycling, the PE potential scope diminishes while the NE potential scope enlarges. The increased inner resistance makes the NE curves almost bended to be a right angle, but not the PE curves. The cell＇s equivalent series resistance （ESR） is more dependent on the NE, and the capacitance is mainly determined by the rapid descent of the NE potential range. The capacitances of the NE are highly rate-dependent, decreasing from 121.3 to 53.1 F/g, by 56.2%, over the range of 5-25 mV/s. However, the PE appears to be weakly dependent and its capacitance is only dropped by 22.1%.