Electronics Science Technology and Application (E-Journal)
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An quantificational method for 51 pesticide residues determination in Pu'er tea by LC-MS/MS
Get PDFPesticide residues in tea is a major issue due to their widely used in tea cultivation. Thus, to protect consumers, an appropriate method for determination of their residues in tea should be done. In this study, a method for the simultaneous determination of 51 pesticides in tea was developed and validated. The tea sample was extracted by acetonitrile and purified SPE clearnet TPT column followed by liquid chromatography coupled to tandem mass spectrometry (LC–MS/MS) with multi-reaction monitoring (MRM) mode. The method was validated according to the linearity, limit of detention, precision, the percentage of recovery at three different spike levels. The linear concentration range used was 10-100ng/ mL, the square of Correlation coefficient r2 was more than >0.995. Recoveries were adequate being in the acceptable range of 72-89% and RSD of <19 % for all the analytes at three level of 0.01,0.05 and 0.11mg/kg, the LOD of all chemicals from 0.001 mg/kg to 0.01 mg/kg .The method was applied for the determination for 400 tea samples collected from Pu'er which contain green tea and black tea. Among the analyzed samples , 36 % samples had Imidacloprid and 25% sample contain Acetamiprid, which were at a level below the European Union maximum residue levels (EU-MRLs). The information would be beneficial for Pu'er tea exporters
Research on Intelligent Vehicle Control System Based on WIFI Network
Get PDFThe development of science and technology has promoted the derivation and development of artificial intelligence technology. The application of artificial intelligence technology in automobile industry is mainly embodied in the research and development of intelligent automobile. Based on the WIFI network of intelligent car use is mainly through the combination of single-chip and wireless network data, through the mobile terminal to send instructions to achieve intelligent car according to the instructions to exercise, and can achieve image and other data transmission. This paper discusses and analyzes the control system of intelligent vehicle based on WIFI network technology
Research on Information Security in Cloud Computing Environment
Get PDFIn order to adapt to rapid development of network information technology, the application of cloud computing technology is increasingly widespread. However, the security problem in the cloud computing environment has not been effectively resolved. Currently, the research on this problem is getting more attention from the industry. In order to further investigate the information security issues of cloud computing environment, this article not only discusses the basic concept, characteristics and service model of cloud computing, but also focuses on the cloud computing security reference model and cloud cube model. In this paper, the information security problems and concrete solutions in the former cloud computing environment are discussed from different aspects
Algorithm Study on Improving Application Efficiency of Independent Solar Power Supply System
Get PDFWith the development of photovoltaic (PV) technologies, applications of photovoltaic have grown rapidly, indicating that the photovoltaic are attractive to produce environmentally benign electricity for diversified purposes. In order to maximize the use of solar energy, this thesis focuses on the PV power generation systems, which includes modeling of PV systems, maximum power point tracking (MPPT) methods for PV arrays. Maximum Power Point Tracking (MPPT) method is an important means to improve the system efficiency of PV power generation system. MPPT theory and various MPPT algorithms are introduced in the literature. Based on those researches, this thesis proposes a novel implementation of an adaptive duty cycle P&O algorithm that can reduce the main drawbacks commonly related to the traditional P&O method
Realization of the Based on WAP Push SMS Gateway
Get PDFWAP PUSH can send message actively and in time,as well as that it can receive message at all time and place, therefore there are favourable application prospect.The paper has simplely introduced the system frame,the push protocol and the push way of WAP PUSH,especially it has introduced the implementation method of the message gateway for WAP PUSH
Network Key Equipment Design Adapted to Underground Pipe Rack and Urban Energy Metering
Get PDFTraditional energy automatic metering management scheme has solved the two level problem of monitoring and application, but there is shortcoming at the transport level. Along with the advancement of industrialization and informationization, a variety of sensing devices, interconnection and unified transport demand is becoming more and more urgent. Based on FPGA platform and multichannel parallel MBUS communication mode, fusion NB - IoT technology, this paper puts forward a suitable for underground pipe rack and the network of urban energy metering design method of key equipment, it is a good way to adapt to a variety of field and meet the requirements of multiple class sensor interconnectivity unified transmission, has the very good application value
High Precision Vehicle Location Technologies Based on Traffic Lights
Get PDFAccording to the low positioning precision and high cost of traditional vehicle positioning technologies, and combined advantages of the newly arisen visible light communication like no extra transmitter needed, no electromagnetic interference and free license, this paper proposed a vehicle positioning method based on traffic light, which could generate the vehicle’s position with the time difference of arrival of the signal light. Also its improved methods based on plan revolution theory were discussed to overcome the deficient in non-coplanar condition and improve the positioning precision. Simulation results showed that these methods, with simple computation and low implementation cost, could realize a real-time high-precision positioning performance, and could meet the requirements of the intelligence transportation system
Wireless Smart Node and Private Cloud Based Environmental Noise Monitoring System
Get PDFThis paper introduces a wireless smart node and private cloud based city ambient noise detection and processing system. With the function of noise data preprocessing and storage, self-diagnostics, and power management, the smart node implements a high-precision, wide-area and continuous noise data acquisition in urban environment. Data are send back from smart node all-round the city to processing center running on private cloud through public mobile communication networks. Applications on the private cloud manage, analyzing and do a data fusion job with geographic information system. The system requires less setting and maintenance cost, and has more flexibility for update and extension.
Brief Discussion of Surveying Technology of Three-dimensional Digital Topographic Map
Get PDF3D digital Topographic drawing adopts 3D profile technology and demonstrates geographic space phenomenon to users, reflects the space features of geographic entity in an integrated and accurate manner and thus realizes even more complete, accurate and straight-forward expression of the objective world. It can not only express the plane relationship between space objects, but also accurately describe and express the ground elevation and geometric object height which upgrade the space expression ability and measuring level of digital map and enhance the space acknowledge ability and analytic ability of map. This article aims to elaborate on 3D digital topographic drawing in three aspects: surveying, mapping and application; mainly introduce the mapping methods of 3D topography and geometric object, integrated matching technologies of topographic model and geometric object model and application of 3D digital topographic drawing. It is expected to have a positive promotion role in the development of 3D GIS
Analysis on Semiconductor Thermoelectric Cooler Temperature Control System Based on MCU
Get PDFWith the progress of science and technology, material application science has developed rapidly. As a kind of new material, the semiconductor refrigeration material has been well applied. Based on that, this essay studies semiconductor thermoelectric cooler temperature control system based on MCU and its application. The research indicates that by controlling power supply’s unit circuit with power dissipation, the system controls the working condition (refrigeration / heating switch, adjustable power) of semiconductor thermoelectric cooler to achieve the goal of measuring and controlling the temperature of some equipment, guaranteeing their proper functioning. The system is easy to operate, and it works safely and reliably, which could meet the overall performance requirements, and is of great application prospect and promotion value