科创中国

Layered organic-inorganic hybrids containing bilayer perovsikte (R-NH3)2(CH3NH3)Pb2I7 (where R=C12H25,C6H5C2H4) were synthesized by reactions in solution. The influences of the solvents and the reactant ratio on the structures of the products were investigated. The structures and the properties of the hybrids were characterized using X-ray diffraction (XRD) and ultraviolet and visible (UV) adsorption spectra. For comparing with the bilayer perovskite hybrids in structure and band gap magnitude, the hybrids containing monolayer perovskite (R-NH3)2PbI4 were also synthesized and characterized. The results demonstrate that the thickness of inorganic layer has obvious effect on the tunneling magnitude of the band gap but the organic part can be micro actuator of band gap.

目的 观察131I治疗Graves甲亢性心脏病的效果.方法 对90例Graves甲亢性心脏病患者采用131I口服法治疗,其中78例采用一次性给药,平均剂量166.5~425.5MBq(4.5~11.5mci);12例在服药观察6~12个月后,因治疗效果较差,给予二次服药,剂量为111~222MBq(3~6mci).结果 经131I治疗后治愈76例,完全缓解14例,总有效率为100%;发生亚临床和早发甲减10例,发生率为11.1%,用甲状腺激素治疗后甲状腺功能恢复正常.结论 房颤是Graves甲亢性心脏病的重要临床表现,131I治疗Graves甲亢性心脏病安全、简便、经济,治愈率高,是Graves甲亢性心脏病治疗的首选方法.

Dual mechanical port machine(DMPM), as a novel electromechanical energy conversion device, has attracted widespread attention. DMPM with spoke type permanent magnet arrangements(STPM-DMPM), which is one of several types of DMPM, has been of interest recently. The unique coupling characteristics of STPM-DMPM are beneficial to improving system performance, but these same characteristics increase the difficulties of control. Now there has been little research about the control of STPM-DMPM, and this has hindered its practical application. Based on a mathematical model of STPM-DMPM, the coupling characteristics and the merits and demerits of such devices are analyzed as applied to a hybrid system. The control strategies for improving the disadvantages and for utilizing the advantage of coupling are researched. In order to weaken the interaction effect of torque outputs in the inner motor and the outer motor that results from coupling in STPM-DMPM, a decoupling control method based on equivalent current control is proposed, and independent torque control for the inner motor and outer motor is achieved. In order to solve address the problem of adequately utilization of coupling, minimizing the overall copper loss of the inner motor and the outer motor of STPM-DMPM is taken as the optimization objective for optimal control, and the purpose of utilizing the coupling adequately and reasonably is achieved. The verification tests of the proposed decoupling control and optimal control strategies are carried out on a prototype STPM-DMPM, and the experimental results show that the interaction effect of torque outputs in the inner motor and the outer motor can be markedly weakened through use of the control method. The overall copper loss of the inner motor and the outer motor can be markedly reduced through use of the optimal control method, while the power output remains unchanged. A breakthrough in the control problem of STPM-DMPM is accomplished by combining the control methods. Good performance in the control of STPM-DMPM will enhance its practicality, particularly as applied to hybrid systems.

目的比较干预前、后某院I类切口手术预防用抗菌药物的合理性,考察干预措施的实施效果.方法将某院2010年12月出院I类切口手术患者1 140例为非干预组,2012年12月出院I类切口手术患者1 148例为干预组,比较2组I类切口手术预防用抗菌药物的合理性.结果干预后,抗菌药物使用率下降了41.6%(P<0.05),第1代头孢菌素应用率提高了30.5%(P<0.05);初次用药时机在术前0.5~2 h的比例提高了33%(P<0.05),术后用药时间≤48 h的比例提高了25.4%(P<0.05);干预前后2组均无一例术后感染.结论实施的干预措施具有可行性和有效性,对促进安全、有效、合理地应用抗菌药物起到了积极作用,但还需加强对抗菌药物合理应用的培训及规范化管理.

为了更有效的利用现代工业领域中的变量控制、无线传感和测控技术对家庭安全和监控进行智能化管理,文章采用STC89C52单片机、TC35I通信模块以及各种传感器器件,设计开发了一套基于GSM(Global system for mobile communications)网络的家庭智能监控器.监控器可以将防盗警情信息发送至用户手机,同时用户也可以以短信息的形式远程查询室内环境状态并控制家用电器设备的运行.系统摆脱了通信距离的限制,具有远程监测与控制等功能,适用于家居、办公等需要防盗报警和智能监控的场所.

Moxa最新发布了一款铁路专用远程I/O-ioLogik E1500系列.这款产品不仅满足了严格的EMC标准,更满足铁路应用的宽温和抗振需求,是车载或轨旁数据采集应用的理想选择.

介绍了影响耐磨铸铁使用寿命的主要因素,即输送的介质特性、现场运行条件、耐磨铸铁用材料性能以及耐磨铸铁部件的结构及水力设计几何参数.利用灰色理论,分析了4个I级影响因素和12个Ⅱ级影响因素对耐磨铸铁现场使用寿命的综合影响,通过大量计算得到了这些影响因素的综合影响及其排序.计算结果表明,在这些Ⅰ级影响因素中,材料性质对使用寿命影响最大,现场运行条件影响最小,而所输送介质特性和泵几何设计参数分别介于它们之间;在Ⅱ级影响因素中,碳化物硬度对使用寿命影响最大,泵的流量影响最小,而其它影响因素分别介于它们之间.

根据AAPMTG43UI的推荐,使用MCNP5与EGSnrc两种蒙特卡罗程序计算6711型125I种了源剂缋计算参数,并将两者计算结果和AAPM推荐值比较,得到相对偏差结果如下:剂量率常数,MCNP5为0.62%,EGSnrc为2.07%;径向剂量函数,MNCP5为0.15%-5.12%,EGSnrc为0%-2.18%.两背计算结果均与推荐值符合得很好,而EGSnrc的计算结果更具优势.

The identification of maximum road friction coefficient and optimal slip ratio is crucial to vehicle dynamics and control.However,it is always not easy to identify the maximum road friction coefficient with high robustness and good adaptability to various vehicle operating conditions.The existing investigations on robust identification of maximum road friction coefficient are unsatisfactory.In this paper,an identification approach based on road type recognition is proposed for the robust identification of maximum road friction coefficient and optimal slip ratio.The instantaneous road friction coefficient is estimated through the recursive least square with a forgetting factor method based on the single wheel model,and the estimated road friction coefficient and slip ratio are grouped in a set of samples in a small time interval before the current time,which are updated with time progressing.The current road type is recognized by comparing the samples of the estimated road friction coefficient with the standard road friction coefficient of each typical road,and the minimum statistical error is used as the recognition principle to improve identification robustness.Once the road type is recognized,the maximum road friction coefficient and optimal slip ratio are determined.The numerical simulation tests are conducted on two typical road friction conditions(single-friction and joint-friction)by using CarSim software.The test results show that there is little identification error between the identified maximum road friction coefficient and the pre-set value in CarSim.The proposed identification method has good robustness performance to external disturbances and good adaptability to various vehicle operating conditions and road variations,and the identification results can be used for the adjustment of vehicle active safety control strategies.