摘要：This paper presents a design for a self-powered radio frequency identification (RFID) tag with a thin film bulk acoustic reso- nating piezoelectric power supply (PPS), which can be used for portable remote temperature monitoring. We call this system a PPS-RFID for short. The RFID systems have been found to have many applications in the internet of things (IOT) in the past decade. But semi-active RFID tags require an onboard battery which limits their applications in many fields. For these reasons, our research focuses on power sources for the RFID tags. This paper emphasizes the circuit design and simulation of PPS. In our tests, 0.283 mW was generated by PPS at 1 Hz vibration by a 650 N impact force. The results showed that the integrated PPS could supply sufficient power for the designed PPS-RFID tag. The PPS-RFID tag can be widely used for temperature monitoring during mobile transport of perishable items such as medicines or food.

摘要：宋代巴蜀郡圃众多,分布广泛。巴蜀郡圃作为府州治衙署的重要组成部分,其空间布局与宋代府州治所选址、城市规划布局密切相关。在园林建筑方面既有亭台楼阁,也有轩榭堂馆等建筑形式,与相应的场景相结合,形成丰富的空间形态。宋代巴蜀郡圃具有多样化的休闲游乐功能,其意境具有浓厚的政治氛围,重视对山水形胜的构建,士大夫阶层的壮大影响了巴蜀郡圃园林的审美情趣和艺术风格。

摘要：A new type of transformation induced plasticity （TRIP） steel with not only high strength and high ductility but also superior welding and galvanizing properties was designed and developed recently. Low carbon and low silicon content were preliminarily selected with the aim of meeting the requirements of superior quality in both welding and galvanizing. Phosphorus was chosen as one of the alloying elements, because it could reduce carbon activity in cementite and increase the stability of austenite. In addition, the possibility of phosphorus segregating at grain boundary was also discussed by thermodynamics as well as kinetics. Phase diagram was estimated at high temperature and the composition of the steel was then selected in the hyperperitectic range to avoid problems, which might occur in sheet steel continuous casting. Phase diagram in the *** temperature was estimated for the steel to obtain the starting temperature of fast cooling. For understanding the minimum rate of fast cooling, pearlite growth kinetics was calculated with self-developed diffusion coefficients of elements in grain boundary. Overaging temperature was determined through the calculation of To temperature by both equilibrium and para-equilibrium assumptions, which was different from the current determination, which is only based on an equilibrium estimation.

摘要：针对中文文本分类任务中N-Gram,素贝叶斯、K最近邻和TF-IDF等经典而广泛使用的文本分类模型的选择困惑问题,基于万余篇中文新闻文本语料数据,设计了一系列的对比实验,考察了各模型在不同参数、不同训练数据规模、不同训练文本长度、类别是否偏斜等多种情境下分类性能的表现,总结了各模型的特性,为中文文本分类模型的选择和应用提供了实践依据和参考.

摘要：为解决把UML-RT行为建模模型平滑过渡到实时多任务系统的图形化软构件设计开发环境的过程设计模型中,本文提出了把UML-RT状态图行为模型转换到该环境下的执行模型的方法。首先介绍UML-RT状态图建模的概念及笔者研制的设计环境,其次给出从UML-RT状态图转换到该设计环境可执行模型的具体方法,最后以一个实例说明了转换方法。

摘要：以鲐鱼下脚料为原料,利用响应面法对其酶解工艺进行优化。结果表明:鲐鱼下脚料的最佳酶解工艺条件为料液比1∶2.86,起始pH 6.94,反应温度50.23℃,反应时间6.26h,制得酶解物的水解度为29.14%,为鱼品下脚料的开发利用提供了理论基础。

摘要：为得到脉冲控制激光半主动末段修正弹落点精度更高的修正力作用方向,提出在传统点火相位计算基础上加入落点预测补偿,并通过建立激光探测器目标方位模型,结合脉冲力的纵向和横向修正能力的分析,推导出改进后的点火相位。采用六自由度弹道仿真进行验证,结果表明,采用文中点火相位进行弹道修正后,落点偏差明显减小,平均脱靶量从56.3m减小到13.1m,圆概率误差从48.1m减小到12.4m,证明了该方法的有效性,为末段修正弹控制策略的设计提供了理论依据。

摘要：目的:分析口腔医学近10年高被引论文的出版信息特点。方法:经Web of Science数据库,获取口腔医学2006~2016年被引频次前100名(TOP 100)论文的出版信息(出版时间和机构、期刊、作者及其国家等),下载全文确认开放获取、研究设计情况,分析出版信息特点。结果:TOP 100论文出版集中在2006~2008年(72%)。93%论文来自口腔医学期刊,>1/3论文来自出版商Elsevier,>2/3论文需付费获取。论文数前10名为欧美国,中国位列11。63%论文由1国完成,2~4国合作最常见。每篇论文平均4个作者,同一作者最多6篇。研究方向主要为牙周病学(37%)包括种植学,研究设计以综述或专家观点为主(53%)。结论:分析高被引论文的出版信息,可为学者提供细致的成果发表和评价、学术交流和走向的参考。

摘要：为促进稻鸭共作技术的推广应用,提高稻田鸭舍的自动化水平,设计了鸭舍自动喂水系统。该系统主要由水箱、液位控制器、液位传感器、乳头式饮水器、水管、水泵等部分组成。液位控制器由STC15F2K40S2单片机和集成控制电路组成,可进行水箱液位检测和水泵驱动,实现水箱低水位自动补水、有效防止高水位水溢出的功能。利用该系统进行了液位控制性能试验,根据试验结果确认该喂水系统为一阶惯性系统。通过SPSS对试验数据进行非线性回归分析,利用系统识别的方法,确定液位高度控制系统的传递函数。根据MATLAB分析系统的动态性能结果可知,从水箱低水位上升到高水位所需时间ts=300s,系统稳态误差ess=0,表明系统运行稳定、反应快速、执行结果准确,可以实现野外鸭舍喂水系统的自动控制。田间作业试验表明:喂水系统的平均每100s故障次数为0.101次,平均故障率为2.71%,时间利用系数平均值为97.35%。喂水系统可靠性达到了设计要求,可满足实际应用需要。

摘要：针对排涝泵站在实际运行时运行方案难选择的问题,根据某泵站的设计要求,在高精度水力机械试验台上,分别用控制变量的方法进行了泵装置的变角和变速性能实验。试验结果显示:变角性能曲线呈近似平移变化,高效区范围宽;变速调节在一定调节范围内符合变速相似原理。通过对实验结果的分析,总结了变角和变速调节在此泵装置下各自的优缺点,拟合出变速条件下最高效率点流量与转速的关系。结合变角调节和变速调节各自的特点,大型泵站可以采用变角调节与变速调节相结合的方式,使得泵站尽可能在高效区运行,节约成本的同时,能够保证泵站的安全稳定运行。