用于MEMS传感器批量制造的微装配系统

手工操作限制了MEMS传感器的批量生产.为了降低生产成本,同时提高传感器的产品质量,研制了柔性自动阳极键合系统.该系统包括一系列功能模块,包括精密定位系统、显微视觉子系统、柔性微操作手、加热系统、键合夹具、物流系统以及其它的附属系统.通过模块重构和调整,可实现不同尺寸规格传感器的键合.基于显微视觉以及微装配系统的特性,提出了基于小波变换的自动调焦清晰度评价函数,同时提出了基于改进史密斯预估器的用于克服视觉延迟的伺服控制结构.集成一维微力传感器的微操作手可实现高精度和无损操作.为了实现自动化操作,开发了包括任务规划和实时控制功能的控制系统.试验验证了该系统的自动键合功能.     

Approximation and universality of fuzzy Turing machines

Fuzzy Turing machines are the formal models of fuzzy algorithms or fuzzy computations. In this paper we give several different formulations of fuzzy Turing machine, which correspond to nondeterministic fuzzy Turing machine using max-＊ composition for some t-norm＊ （or NFTM＊, for short）, nondeterministic fuzzy Turing machine （or NFTM）, deterministic fuzzy Turing machine （or DFTM）, and multi-tape versions of fuzzy Turing machines. Some distinct results compared to those of ordinary Turing machines are obtained. First, it is shown that NFTM＊, NFTM, and DFTM are not necessarily equivalent in the power of recognizing fuzzy languages if the t-norm＊ does not satisfy finite generated condition, but are equivalent in the approximation sense. That is to say, we can approximate an NFTM＊ by some NFTM with any given accuracy; the related constructions are also presented. The level characterization of fuzzy recursively enumerable languages and fuzzy recursive languages are exploited by ordinary r.e. languages and recursive languages. Second, we show that universal fuzzy Turing machine exists in the approximated sense. There is a universal fuzzy Turing machine that can simulate any NFTM＊ on it with a given accuracy.     

车载液压发电机行车发电转速补偿控制

研究了变转速输入和负载扰动下马达稳速输出控制方法。基于欧洲NEDC循环路况构建车辆行驶仿真模型、泵控马达数学模型以及负载数学模型,提出车载液压发电机泵控马达稳速输出控制策略,对系统进行仿真研究。结果表明在变转速输入和负载扰动下,加入转速补偿控制能够极大提高控制精度和鲁棒性。     

A rolling 3-UPU parallel mechanism

A novel rolling mechanism is proposed based on a 3-UPU parallel mechanism in this paper. The rolling mechanism is composed of two platforms connected by three UPU (universal-prismatic-universal) serial-chain type limbs. The degree-of-freedom of the mechanism is analyzed using screw theory. Gait analysis and stability analysis are presented in detail. Four rolling modes of the mechanism are discussed and simulated. The feasibility of the rolling mechanism is verified by means of a physical prototype. Finally, its terrain adaptability is enhanced through planning the rolling gaits.     

Experimental and computational validation of a scaled train tunnel model using modal analysis

Acoustic engineers are faced with the challenge of minimising reverberation time in their designs so as to contribute to the health and well-being of those traveling by train and those on the platforms. Although the problem is easy to identify, it is not as simple to solve. The acoustical environment of a train tunnel is complex, with a variety of noise contributing factors such as train announcements, speech of commuters, ventilation systems, electrical equipment and wheel and rail noise. As a result, there is some difficulty in modeling the complete acoustic environment with computational or acoustic first principles. In this study, an experimental rig was constructed to model the acoustic behavior within a tunnel. The modal properties for the 300 Hz to 1500 Hz range, including resonances and mode shapes were identified and were shown to successfully correspond to theoretical results and a computational model created in COMSOL using Finite Element Analysis.     

基于LOGO的液体混合装置控制系统的设计

根据液体混合装置自动控制系统的要求,采用LOGO!逻辑控制器模块通过接触延时、锁定继电器等,对控制系统的硬件和软件进了分析与设计,制作了该系统人机界面的控制面板,并通过LOGOs!oft comfort v6.15软件进行了程序的在线仿真,仿真结果验证了该控制系统的正确性与可行性。     

内固定加旋髂深血管髂骨骨膜-骨瓣治疗青少年股骨颈骨折

目的探讨带旋髂深血管髂骨骨膜-骨瓣移植加空心加压螺钉内固定治疗青少年股骨颈骨折的疗效。方法经改良的Smith-Petersen入路,取旋髂深血管髂骨骨膜-骨瓣移植于股骨颈骨折骨槽内,2～3枚空心加压螺钉内固定治疗23例。结果经1.5～5年随访,22例4个月～1年达到骨性愈合。1例股骨头缺血性坏死Ⅱ期。髋关节功能评价为优15例,良5例,可3例。结论带旋髂深血管髂骨膜-骨瓣移植加空心加压螺钉内固定,血供好,固定牢固,能促进骨折愈合,减少股骨头坏死的发生,是治疗青少年股骨颈骨折的有效方法。     

系统性红斑狼疮合并肺动脉高压16例临床分析

目的分析系统性红斑狼疮(SLE)合并肺动脉高压(PAH)的临床特点,并探讨治疗策略。方法回顾性分析87例SLE的临床资料,按照PAH的诊断标准分为PAH组及非PAH组,对两组的活动性、临床表现、自身抗体、补体进行比较。结果87例SLE患者中合并PAH16例,发生率为18.39%。两组的活动性、补体C3差异有统计学意义(P<0.05),PAH组的雷诺现象及肺间质纤维化发生率明显高于非PAH组,两组的自身抗体差异无统计学意义(P>0.05)。结论SLE可继发PAH,与SLE的活动性、雷诺现象及肺间质纤维化有一定的关系,与自身抗体无关。治疗应以治疗原发病为主。     

急性闭合性颅脑损伤患者肠道菌群变化

目的观察急性闭合性颅脑损伤患者肠道细菌数量的变化。方法选取交通事故导致的12例急性闭合性颅脑损伤的男性患者的粪便进行细菌培养,观察细菌数量的变化。测定血浆去甲肾上腺素浓度。结果颅脑损伤组与对照组相比乳酸杆菌数量明显减少,大肠杆菌数量显著增多(P值均<0.01)。颅脑损伤后血浆去甲肾上腺素水平较对照组明显升高(P<0.01)。结论急性闭合性颅脑损伤可引起肠道菌群失调。     

重庆燃气集团启动燃气管网普查工作

2011年12月初,管道维护分公司按照燃气集团管网普查要求,召开了燃气管网及设施设备普查工作动员会,分公司经理倪宏伟对管网普查工作进行了全面布置,并将管网普查工作纳入到分公司近期与2012年重点工作。