新生儿巨大第一鳃裂囊肿手术1例报告

先天性第一鳃裂囊肿发病率很低，新生儿患此病更为罕见，我院于1990年11月成功收治新生儿巨大第一鳃裂囊肿1例，报告如下。患儿男，15天，生后即发现左面顿都有一6cm×6cm大小硬质肿块，迅速增大，到入院时已达15cm×12cm，上至左眼睑下线，前至四角，后至耳后沟，下至颈上1／3     

坚持高质量发展全面创建精品工程

京沈铁路客运专线是国家"八纵八横"高铁网主骨架京哈通道的重要组成部分,线路正线全长698 km ,其中沈阳至承德南段于2018年12月29日开通运营,北京朝阳至承德南段于2021年1月22日开通运营.京沈客专建成开通运营,北京至沈阳运行时间缩短至2.5 h ,形成了东北地区又一进出关高铁通道,对完善路网布局,提高铁路进...     

A method to analyze the voltage-actuation response of a pre-strained circular dielectric elastomer actuator model

Dielectric elastomers (DEs) are the polymers capable of inducing deformation under electrical stimulation. When subject to a voltage across its thickness, the material reduces in thickness and expands in area. This paper presents a new method to analyze deformation and stress distribution response of the dielectric elastomer actuator (DEA) model under different applied voltage. An equal-biaxial pre-strained circular actuator model was built. The Yeoh strain energy potential and the collocation method are used for describing the large strain actuation response and stress distribution. The study in this paper has shown that: the stress and the stretch distributions in the passive region of the DE actuator depend on the radial distance from the center at the calculation point of the passive region and the magnitude of the applied voltage; with the same excitation applied voltage, we can get a larger deformation actuation by choosing an appropriate pre-stretch ratio; the influence of the non-ideal material has seriously affected the actual deformation of the DE actuators. This analytical model has a reference potential for the design optimization of high performance DEA systems and the model-based control of the DEA robot.     

提高DCC型自动称重灌包机称量速度的研究

通过ＤＣＣ型灌包机称量过程的分析，阐述影响称量精度和称量速度的主要因素是粗、细加料门关闭产生的机械振动和加料流变化的冲击力。指出ＤＣＣ型灌包机是机电一体化产品，在优化机械结构的同时，引进新的控制、检测方式——时间禁止比较法及二次检测法，从而在保证称量精度的条件下，提高灌包机的称量速度。     

铁路薄壁空心墩盖板封顶的施工

薄壁空心墩施工是准池铁路桥梁下部结构施工中最复杂的环节之一,上实体部分更是薄壁空心墩施工中的难点,普通方法施工薄壁空心墩上实体的施工用期较长,而盖板法在ZCZQ-1标下恼亥特大桥薄壁空心墩施工过程中成功应用。详细讨论了薄壁空心墩上实体部分采用盖板封顶的施工工艺及质量控制,同时从工期、施工周期、成本等方面与传统施工方法做了比较。详细阐述了用作封顶的盖板制作方案、几何尺寸及配筋情况等,以供今后薄壁空心墩尤其是空心高墩施工时借鉴。     

SS_3型机车重联补机辅机单相起动故障的改进

针对SS3型机车重联电路引发的重联补机辅机单相起动问题,提出对重联电路的改进方案。