时滞动态网络自适应同步的研究

研究了节点带有时滞且节点之间的通信也带有时滞的复杂动态网络的自适应同步问题。基于稳定性理论,设计了复杂网络同步的自适应控制器。该控制器结构简单,易于应用。最后,以环状耦合的时滞Lorenz系统为例进行数值仿真,检验了结果的正确性和设计方法的有效性。     

糖类抗原CA125水平测定在结核性腹膜炎诊治中的意义

研究了一种新型扭转压电陶瓷超声换能器.基于机电类比原理,对切向极化的压电陶瓷薄圆环振子的扭转振动特性进行了研究,建立了其机电类比等效电路模型,从等效电路得出了环形振子的扭转振动频率方程的解析式及共振频率的计算公式.在此基础上,分析了换能器的共振与其几何尺寸间的关系;并利用有限元方法对压电陶瓷薄圆环扭转振动模态进行了分析.结果表明,在换能器压电陶瓷圆环内外半径比增大时,共振频率随之增大.     

CO2 methanation over rare earth doped Ni based mesoporous catalysts with intensified low-temperature activity

Ni based catalysts are usually used for catalyzing the CO₂ methanation to produce synthetic natural gas due to their low cost, though their catalytic activities cannot be comparable with the noble metal counterparts. In order to address this challenge, a series of rare earth (La, Ce, Sm, and Pr) doped Ni based mesoporous materials had been facilely fabricated by the one-pot evaporation induced self-assembly (EISA) strategy and directly employed as the catalysts for CO₂ methanation. These mesoporous catalysts had been systematically characterized by means of X-ray diffraction, N₂ physisorption, transmission electron microscope, X-ray photoelectron spectroscopy, H₂ temperature programmed reduction, CO₂ temperature programmed desorption, and so on. It was found that the Ni species were highly dispersed among the mesoporous framework and the strong metal-framework interaction had been formed. Thus, the thermal sintering of the metallic Ni nanoparticles could be effectively suppressed under CO₂ methanation conditions, promising these mesoporous catalysts with 50 h excellent catalytic stabilities without evident deactivation. Besides, the rare earth dopants could greatly increase the surface basicity of the catalysts and intensify the chemisorption the CO₂. Further, the rare earth elements were also functioned as the electron modifiers, which was also helpful in activating the CO₂ molecule. The apparent activation energies of CO₂ could be obviously decreased by rare earth dopants. As a result, their low-temperature catalytic activity had been greatly intensified over these rare earth elements promoted catalysts.     

自主型水处理实验项目的设置与教学实践

将工程设计流程引入到自主型水处理实验项目的开设中,把基础性、验证性、综合设计性实验有机联系在一起;在师资、知识、设施和制度等保障下,赋予学生较多的自主性,以激发其积极性、主动性和创造力,使学生既掌握工程设计经验,又具备科研探索能力。     

间苯二甲酰肼在绿色轮胎胎面胶中的应用研究

将间苯二甲酰肼(IDH)母胶CSC920用于绿色轮胎胎面胶中,研究IDH对绿色轮胎胎面胶性能的影响。结果表明:与未添加IDH母胶CSC920的混炼胶相比,添加IDH母胶CSC920的混炼胶的Payne效应明显降低,硫化速度加快,焦烧时间缩短;硫化胶的交联密度增大,定伸应力、拉伸强度和耐屈挠疲劳性能提高,拉断伸长率、撕裂强度和耐磨性能降低,损耗因子减小,压缩生热和活化能下降,老化后耐磨性能以及拉伸强度、拉断伸长率和撕裂强度保持率提高。     

轮胎结构偏差对接地印痕影响的试验和仿真研究

综合利用试验和有限元仿真方法,并引入不对称因子表征轮胎接地印痕的不对称性,研究结构偏差(带束层整体偏移和左右胎肩厚度差异)对轮胎接地印痕的影响。结果表明,结构偏差易造成轮胎接地印痕不对称,其中左右胎肩厚度差异比带束层整体偏移对轮胎接地印痕不对称性的影响更为显著。本研究结果为轮胎生产工艺控制和改善轮胎接地印痕提供了依据。     

双金属复合管焊接技术分析

双金属复合管的焊接接头结构复杂,焊接难度较大。通过对双金属复合管端面处理工艺和对接焊接工艺分析,提出了端部堆焊工艺较端部封焊工艺易于焊接但不够经济的现状,指出对于薄壁小直径双金属复合管道的焊接宜采用合金焊丝对接焊工艺,而对于厚壁大直径双金属复合管道则宜采用过渡焊方法焊接。另外,还分析了当前的焊接评定标准,强调了制定适宜复合管的焊接工艺评定标准的必要性。     

水合物沉积物介电特性测量实验

介电常数法是探测冻土区水合物的一项有效技术。通过物理模拟实验,研究冻土区砂岩水合物沉积物的介电特性与水合物饱和度、骨架粒度等因素的关系,对水合物的勘探和开发具有重要意义。在实验室以不同粒度石英砂为骨架制备甲烷水合物和四氢呋喃（THF）水合物沉积物样品,并使用探地雷达测量其介电常数。结果显示：不同石英砂粒度条件下,两种甲烷水合物沉积物的介电常数均随饱和度增大而减小;相同饱和度条件下,围岩粒度小的甲烷水合物沉积物介电常数高,推断是孔隙内未反应的水引起的;在相同石英砂粒度条件下,THF水合物沉积物与甲烷水合物沉积物的介电常数随饱和度变化趋势相同,均表现为介电常数随饱和度增大而减小;在相同饱和度和石英砂粒度条件下,甲烷水合物沉积物介电常数整体大于THF水合物沉积物,推断是甲烷水合物沉积物孔隙中气相因素及未反应的水等综合因素所致。     

YQR3系列磁控软起动柜在高炉除尘风机上的应用

通过对比目前使用的几种除尘风机高压电机的软起动装置,阐述了YQR3系列磁控软起动装置的系统组成和工作原理,介绍了系统的起动过程以及参数的设定。