悬吊运动训练在肩关节康复中的应用

自2008年国内开始出现报道至今,悬吊运动训练在医学康复和体育训练领域应用较多,悬吊运动训练具有改善神经肌肉控制、增强局部稳定和平衡能力的作用,在临床应用中,以脑卒中、腰背疼痛及颈椎病中的应用报道居多,肩关节康复中应用报道较少。肩关节作为人体活动度最大的关节,参与较多的上肢动作,受年龄、解剖结构等因素影响,容易产生慢性炎症和创伤后关节不稳定,使患者肩部疼痛和功能受限,给其生活和运动带来极大不便,而临床常用的治疗手段有些容易出现症状反复。该文对悬吊运动训练在肩关节康复中应用相关文献资料进行梳理,对其理论研究、临床应用进行综述分析,以期对今后悬吊运动训练在肩关节康复方面的应用提供文献支持并提出相关建议。     

Describing students of the African Diaspora: Understanding micro and meso level science learning as gateways to standards based discourse

In much of the educational literature, researchers make little distinction between African-American students and students of the African Diaspora who immigrated to the United States. Failing to describe these salient student differences serves to perpetuate an inaccurate view of African-American school life. In today’s large cities, students of the African Diaspora are frequently learning science in settings that are devoid of the resources and tools to fully support their success. While much of the scholarship unites these disparate groups, this article details the distinctive learning culture created when students from several groups of the African Diaspora learn biology together in a Brooklyn Suspension Center. Specifically this work explains how one student, Gabriel, functions in a biology class. A self-described black-Panamanian, Gabriel had tacitly resigned to not learning science, which then, in effect, precluded him from any further associated courses of study in science, and may have excluded him from the possibility of a science related career. This ethnography follows Gabriel’s science learning as he engaged in cogenerative dialogue with teachers to create aligned learning and teaching practices. During the 5 months of this research, Gabriel drew upon his unique lifeworld and the depth of his hybridized cultural identity to produce limited, but nonetheless important demonstrations of science. Coexistent with his involvement in cogenerative dialogue, Gabriel helped to construct many classroom practices that supported a dynamic learning environment which produced small yet concrete examples of standards based biology. This study supports further investigation by the science education community to consider ways that students’ lifeworld experiences can serve to structure and transform the urban science classroom.

Mg-Al-Fe类水滑石--蒙脱土体系流变性研究

研究了带永久正电荷的Mg-Al-Fe类水滑石(Mg-Al-Fe-HTlc)和带永久负电荷的钠质蒙脱土(MT)组成的悬浮体的流变性,考察了Mg-Al-Fe-HTlc/MT质量比(R)对表观粘度(ηA)、Bingham屈服值(τB)和E-B系数(K值)3个流变参数的影响.实验结果表明,MT含量≥3%的纯MT体系和Mg-Al-Fe-HTlc/MT体系为塑性流体.纯MT体系符合Bingham流变方程;Mg-Al-Fe-HTlc/MT体系在低剪切速率(D,0～300s-1)区不符合Bingham流变方程;纯MT体系和Mg-Al-Fe-HTlc/MT体系在研究的范围内均符合Brinkman粘度方程.ηA、τB和K值随R的增大均呈现为先增大后减小的变化,在R=0.15附近出现最大值.对颗粒间的相互作用机理和表征参数进行了探讨,认为Brinkman粘度方程的E-B系数K值是能表征体系粒子间内在相互作用的"本征流变参数".     

“展缓判断”求真相:冯友兰与胡适对孔老先后之争的学术意义——兼对冯友兰复胡适信函时间考证

20世纪30年代初,冯友兰与胡适等人针对老子其人其书与孔子的先后问题,曾经展开过多次交锋。双方各自从所擅长的思想系统分析和考证方法辨伪等几个方面进行讨论,意见迭出。近半个世纪后,最终在出土文物的佐证下,胡适生前的推断被证明为真。他所力倡的"展缓判断"学术原则及对争议问题的处理态度对当下的学术研究具有很大的启示意义。     

电磁悬浮系统的专家PID控制

悬浮控制是磁悬浮系统的关键问题,其驱动系统必须在稳定悬浮的基础上设计。将专家PID控制用于电磁悬浮系统(Electromagnetic Suspension System,简称EMS),实现了稳定悬浮。相对于常规的磁悬浮系统,由于控制中加入了专家系统,悬浮系统的响应速度明显增加。系统中只需要气隙传感器而无需加速度传感器。悬浮仿真实验表明,系统具有很好的适应性,也获得了较高的控制精度。     

Research on the rheological properties of pesticide suspension concentrate

This study reports research on pesticide suspension rheology and a new rheological parameter, the relative value of approach, which has great advantage for judging the physical stability of a pesticide suspension concentrate. Experiments showed that the system can form stable dispersions when the value of the relative value of approach (Sr) is less than 0.1.     

Research on the rheological properties of pesticide suspension concentrate

This study reports research on pesticide suspension rheology and a new rheological parameter, the relative value of approach, which has great advantage for judging the physical stability of a pesticide suspension concentrate. Experiments showed that the system can form stable dispersions when the value of the relative value of approach (Sr) is less than 0.1.     

Parameter effects on the dynamic characteristics of a super-long-span triple-tower suspension bridge

A 3D finite element model for the Taizhou Yangtze River Bridge, the first triple-tower long-span suspension bridge in China, is established based on the nonlinear finite element software ABAQUS, and the dynamic characteristics of the bridge are analyzed using the LANCZOS eigenvalue solution method. The study focuses on the effects of the vertical, lateral and torsional stiffness of the steel box girder, the rigid central buckle and the elastic restraints connecting the towers and the steel box girder on the dynamic characteristics of the triple-tower suspension bridge. Our results show that, in general, the dynamic characteristics of the triple-tower suspension bridge are similar to those of two-tower suspension bridges. The vertical, lateral and torsional stiffness of the steel box girder have different effects on the dynamic characteristics of triple-tower suspension bridges. The elastic restraints have a more significant effect on the dynamic characteristics than the central buckle, and decreasing the stiffness of the elastic restraints results in the appearance of a longitudinal floating vibration mode of the bridge. Also, rigid central buckles have a greater influence on the dynamic characteristics of triple-tower suspension bridges than on those of two-tower suspension bridges. The results obtained could serve as a valuable numerical reference for analyzing and designing super-long-span triple- tower suspension bridges.     

630MW超临界机组锅炉低温再热器悬吊管管卡处磨损分析及治理

某公司的2084/25.4-571/569超临界压力直流锅炉,在检修时发现低温再热器水平管排的悬吊管管卡下部管子磨损。磨损区域位于低温再热器水平管排的悬吊管管卡(宽30mm)两端的下部,面积约1平方厘米。现场经过认真分析,确定方案,加装防磨装置。在锅炉运行后进行检查,防磨效果显著,对于类似结构的锅炉管排防磨具有参考作用。