体内微机电无线能量传输系统的设计与试验

介绍无线能量传输系统的工作原理并详细介绍该系统的子系统,设计应用于体内微机电系统的无线能量传输系统的初级能量产生系统和次级能量接收系统,最后利用体内温度采集胶囊和体外的无线温度接收器,对系统进行测试与试验研究,试验结果表明该系统能够很好地为体内的微机电系统进行无线供能.     

存储式远程温度测量系统

针对气象站、蔬菜大棚需要温度进行长时间记录和无线传输的需要,设计了具备数据存储和无线传输功能的温度测试系统。温度测量系统以ATmega88处理器和GPRS模块为核心,采用串行外设接口的ADT7310进行温度测量,实现了温度的精确采集、存储和无线传输。通过无线传输功能,实现了温度测试系统测量精度、测量周期等测量方式的远程控制。     

仓库环境控制系统的设计

防潮、防霉、防腐、防爆是仓库日常工作的重要内容。本文介绍了一种以DHT11数字温湿度传感器、AT89S52单片机、315M无线收发模块为主的仓库温度湿度控制系统。本系统采用DH11数字温湿度传感器与AT89S52组成温度湿度实时采集系统进行实时的采集。随后将采集的数据通过单片机串口发送方式由315M无线收发模块将采集的数据传送至数据处理中心处理,根据预设的温度、湿度值决定是否驱动控制继电器驱动风机、加湿机、升温机工作,从而实现对温度、湿度的控制。     

亳州市储药冷库温湿度测控系统研究

介绍了具有无线功能的温湿度测控系统的软硬件设计及工作原理。该系统应用智能型温湿度传感器SHT11来检测温度和湿度,通过采用内嵌51单片机的NRF9E5芯片将测量数据进行处理和修正后,并通过NRF9E5内置的NRF905无线模块完成与PC机的无线通信,降低了布线成本,提高了系统的灵活性和可扩展性。该系统体积小、功耗低、电路简单,可以方便安装和实时监控。     

采用虚拟仪器技术的湿度传感器测试系统

为满足湿度传感器生产的需要,采用虚拟仪器技术设计了电容式湿度传感器测试系统。该测试系统由湿度源、信号采集系统及计算机组成,可以同时对30-100个湿度传感器的电容值和Q值进行测量,使湿度传感器测试实现了智能化、自动化。     

基于ZigBee技术的高精度温度监测系统

针对当前工业无线温度采集系统大都采用数字温度传感器,使用具有局限性,温度精度低等问题.设计了以Pt100与24位A/D为温度采样部分的ZigBee高精度温度监测系统.该系统利用ZigBee技术,以低功耗CC2530芯片为硬件核心,并移植了Z-Stack协议栈.测试结果表明:该系统运行稳定、实时、准确,对提高工业无线温度采样精度具有十分重要的意义.     

无线温湿度采集系统的研制

为解决目前烟草行业温湿度计量检定布线复杂、功能简单等缺点,该文设计开发了一套基于WIFI和单片机的无线温湿度采集系统。通过试验分别对系统的精度、一致性、重复性和稳定性进行了测试,并与传统的有线采集装置进行了比对试验。结果表明:①无线温湿度采集系统的温度测量误差满足±0. 1℃,湿度测量误差满足±1. 0%RH,均满足计量检定的要求;②采用假设检验方法对一致性、重复性进行了验证,一致性测试结果 P值均大于显著性水平α(0. 05),重复性P值计算结果为0. 766,大于显著性水平α,表明系统一致性和重复性较好。采用休哈特控制图法对稳定性进行了验证,通过温湿度X-R图判断该系统长期稳定性较好;并且与传统有线采集装置进行了试验对比,二者温湿度测量结果无显著性差异。该温湿度无线采集系统为实验室温湿度的计量检定提供了一种更加便捷高效的测量方法。     

农田小气候自动气象观测系统

文章介绍了一套完整的农田小气候自动气象观测系统.该系统可将区域内的多个农田小气候自动气象观测站通过无线或有线网络组成观测系统,从而实现多个农田小气候的多层温度、湿度、风、辐射、二氧化碳以及土壤温度和湿度的观测,通过分析农田小气候相关气象参数,为农业种植,以及设施农业提供技术支持,指导农业活动的开展.     

基于ZigBee的森林火灾预警监测系统的研究

针对森林火灾具有突发性和预防难度大的特点,设计了一种基于ZigBee的森林火灾预警监测系统。该预警监测系统将ZigBee的无线组网技术与无线传感器网络技术相结合,对火焰、湿度、温度、烟雾浓度等参数进行实时监测,并通过北斗短报文系统实现无地面通信环境下的导航、定位、数据采集和传输;同时,该预警监测系统设置了自供给电源模块,可以实现监测的实时性和连续性,大大提升了森林防火智能化程度。     

植物综合参数动态测试系统的研制

植物综合测试系统是一种应用单片机89C51设计的新型测试仪器,该仪器可以同时采集8路数据,对植物蒸腾流速率、土壤的湿度、光照度、空气的相对温度和湿度进行24h动态综合测试.     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.