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关键词： artificial neural networks   lithium-ion battery packs   sensor compression rate   temperature-field sparse-reconstruction   virtual thermal sensors  

摘要： To monitor the temperature of lithium-ion battery packs more accurately with as few sensors as possible, a temperature-field sparse-reconstruction technique based on an artificial neural network (ANN) and a virtual thermal sensor (VTS) is proposed herein. 64 uniformly distributed temperature points of lithium-ion battery packs in seven discharge cycles are measured by a thermometer, and the 64 sensors are further divided into real thermal sensors (RTS) and VTSs according to a certain number and spatial position relationship. In addition, the sensor compression rate (SCR) is defined, herein, to quantitatively measure the impact of the RTS number on temperature-field sparse-reconstruction. ANN is built and compared with linear regression (LR). The results show that the temperature-field sparse-reconstruction based on ANN and VTS can provide accurate and robust prediction;the maximum mean absolute error (MAE) of ANN is less than 0.1873 degrees C (SCR = 1.56%) in the experiment. ANN obtains better accuracy with fewer RTS compared with LR. In addition, the proposed principle of sensor layout design is effective. Herein, the temperature-field sparse-reconstruction of battery pack is realized without any knowledge of battery thermal properties, heat generation, or thermal boundary conditions, and the optimal number of RTS under given accuracy requirements are obtained.

关键词： electrochemical detection   lab-on-a-glove   pesticides   Trifluralin   wearable sensor  

摘要： In this study, a flexible glove-based electrochemical sensor as a wearable point-of-use screening tool has been fabricated for defense and food security applications. To design the wearable glove-based sensor, we drew conductive patterns on the fingers of a rubber glove via gold@silver-modified graphene quantum dots (Au@Ag core-shell/graphene quantum dots [GQDs]) nano-ink with optimal thickness. Then, this platform is combined with a portable electrochemical analyzer for on-site detection of trifluralin pesticide in the range of 10 nM to 1 mM with the low limit of quantification (LLOQ) of 10 nM. The high efficiency and distinction of the trifluralin at specified concentrations in real leaf and apple samples were performed by simply touching with the glove and in spikes solution by immersing of fingertips. With their high sensitivity, selectivity, rapid, and easy operation pesticide analysis, these glove-embedded sensors can also be engaged in on-site monitor of other chemical threats and can be expanded to water and environmental samples.

关键词： Fibre reinforced cementitious matrix (FRCM)   Cyclic behaviour   Crack width   Interface shear stress  

摘要： This paper presents an experimental study on the local and global mechanical behaviours of textile-reinforced cementitious matrix composites (TRCs) subjected to cyclic loading. Two configurations are tested: TRCs with one and two layers. These composites were tested under three different loading modes: monotonic loading until failure, cyclic loading in the pre-cracking stage, and cyclic loading in the crack propagation stage with 3000 cycles. The cyclic loading was followed by a residual tensile test until failure. The TRCs were equipped with distributed fibre optic sensors placed at the core of the specimens. These sensors enable the study of local internal behaviour at the textile/matrix interface and help deduce the evolution of the micro-mechanical parameters of the TRC, such as the load transfer, shear stress and contact mode at the textile/matrix interface. Moreover, the digital image correlation technique is used to assess the evolution of the crack widths for the tested TRCs.

关键词： Internet of things  

摘要： With the development of sensor technology and the Internet of Things (IoT) technology, the trend of miniaturization of sensors has prompted the inclusion of more sensors in IoT, and the perceptual feedback mechanism among these sensors has become particularly important, thus promoting the development of multiple sensor data fusion technologies. This paper deeply analyzes and summarizes the characteristics of sensory data and the new problems faced by the processing of sensory data under the new trend of IoT, deeply studies the acquisition, storage, and query of sensory data from the sensors of IoT in e-commerce, and proposes a ubiquitous storage method for massive sensory data by combining the sensory feedback mechanism of sensors, which makes full use of the storage resources of IoT storage network elements and maximally meets the massive. In this paper, we propose a ubiquitous storage method for massive sensing data, which makes full use of the storage resources of IoT storage network elements to maximize the storage requirements of massive sensing data and achieve load-balanced data storage. In this paper, starting from the overall development of IoT in recent years, the weak link of intelligent information processing is reinforced based on the sensory feedback mechanism of sensor technology.

关键词： Land use  

摘要： In the regional landscape pattern, woodland landscape patches are developed in a regular manner, showing a trend of agglomeration as a whole;the concentration and dominance of landscape patches of cultivated land, grassland, and unused land are decreasing, and the overall situation is fragmented;the water landscape pattern is also showing a regular development state to varying degrees. On the whole, the landscape of a certain area is scattered and fragmented, and the dominant landscape types dominate the overall landscape layout of the region. The diversity of land use landscape pattern shows positive autocorrelation as a whole. According to the Moran's I index of the diversity of land use landscape patterns, the overall agglomeration effect of the region has increased, but the overall trend is in a balanced trend. The ecological service value of urban land use change continues to increase, but the regional differences are significant, the structure is simple, and it is mainly supported by ecosystems such as forest land, water area, and agricultural land. Based on the analysis of the spatiotemporal evolution of land use, an in-depth analysis of the urban water environment, atmospheric environment, soil environment, urban heat island, and other environmental issues of the urban land use in the study area is carried out. The calculation and analysis results of the ecological service value of urban land use change and its flow direction change show that the ecosystem service value has increased, and the regional difference and flow direction of the ecosystem service value have changed significantly.

关键词： 光纤   压阻式   电容式   液位传感器  

摘要： 液位控制是日常生活和工业过控系统中常见的控制问题之一,要实现精确的液位控制目标,需要选择合适的液位传感器。本文主要围绕不同液位传感器的测量原理及方式,分析了不同类型液位传感器的研究现状。通过分析各类主流液位传感器研究和使用中出现的普遍性问题,对主流液位传感器技术未来的发展趋势进行了展望。

关键词： 机电自动化   传感器基础   应用分析  

摘要： 众所周知,传感器技术是近些年被应用到机电领域的一种新型技术,自传感器技术被应用以来,其在机电领域便呈现出非常理想的应用效果。传感器属于自动化系统的核心技术,在诸多先进技术和设备的辅助之下,传感器技术的功能得到了越来越充分的挖掘,在机电领域也有着有越来越重要的地位。本文将就机电自动化控制中传感器技术的具体应用进行深入的分析和探究。

关键词： 汽车电子   智能传感器   传感器  

摘要： 论文对智能传感器进行了简单的介绍,对其在汽车电子系统中的作用及价值进行了相应的论述,并运用具体案例作为说明,最后提出了一些对强化智能传感器应用的一些建议,给相关人员以参考。

关键词： 农业发展道路   环境传感器   科学监测   传感器技术   物联网技术   智慧农业   深度融合   远程控制  

摘要： 智慧农业是物联网技术与传统农业的深度融合,其中最重要的是传感器技术。通过传感器,可以摆脱天气等自然因素的限制,并在温室、水产品和畜牧业等领域实现远程科学监测,从而有效减少人类的消费。农业传感器已将传统的农业生产引向智能、自动化和远程控制的智能农业发展道路。农业传感器主要包括生命信息传感器和环境传感器。