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  • 1
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    Structural design and manufacture of high packing density micro-thermoelectric power generators using thermoelectric films (2011)
    Institute of Physics (IOP)
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    Publication Date: 2011-06-10
    Description: A new micro-thermoelectric power generator module with high packing density of film thermoelectric legs has been proposed, in which a large number of p-type and n-type thin-film thermoelectric legs are electrically connected in series. A theoretical model has been established to simulate the output voltage and power of the proposed module, and the results shows that much higher output voltage and output power can be obtained simply by integrating more film thermoelectric components. Based on the proposed module, a micro-thermoelectric power generator containing 160 film thermocouples is fabricated with a size of 25mm (length) × 4mm (width) × 1mm (thickness). Its open-circuit voltage, maximum output power and corresponding power density at a temperature difference of 20K are 630mV, 35.73μW and 357.3μW·cm −3 , respectively.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 2
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    Study on the stability of waterpower-speed control system for hydropower station with upstream and downstream surge chambers based on regulation modes (2014)
    Institute of Physics (IOP)
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    Publication Date: 2014-12-11
    Description: In allusion to the hydropower station with upstream and downstream surge chambers, a complete mathematical model of waterpower-speed control system that includes pipeline system and turbine regulation system is established under the premise of the breakthrough of Thoma assumption in this paper. The comprehensive transfer functions and free movement equations that characterize the dynamic characteristics of system are derived when the mode of governor is respectively frequency regulation and power regulation. Then according to Routh- Hurwitz theorem, the stability domain that describes the good or bad of stability is drawn in the coordinate system with the relative areas of upstream and downstream surge chambers as abscissa and ordinate respectively. Finally, the effects of Thoma assumption, flow inertia, regulation modes, and governor parameters on the stability of waterpower-speed control system are analyzed by means of stability domain. The following conclusions have been come...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 3
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    Study on the stability of waterpower-speed control system for hydropower station with air cushion surge chamber (2014)
    Institute of Physics (IOP)
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    Publication Date: 2014-12-11
    Description: According to the fact that the effects of penstock, unit and governor on stability of water level fluctuation for hydropower station with air cushion surge chamber are neglected in previous researches, in this paper, Thoma assumption is broken through, the complete mathematical model of waterpower-speed control system for hydropower station with air cushion surge chamber is established, and the comprehensive transfer function and linear homogeneous differential equation that characterize the dynamic characteristics of system are derived. The stability domain that characterizes the good or bad of stability quantitatively is drawn by using the stability conditions. The effects of the fluid inertia in water diversion system, the air cushion surge chamber parameters, hydraulic turbine characteristics, generator characteristics, and regulation modes of governor on the stability of waterpower-speed control system are analyzed through stability domain. The main conclusions are as follo...
    Print ISSN: 1755-1307
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    Topics: Geography , Geosciences , Physics
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  • 4
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    The orthorectified technology for UAV aerial remote sensing image based on the Programmable GPU (2014)
    Institute of Physics (IOP)
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    Publication Date: 2014-03-19
    Description: Considering the time requirements of the disaster emergency aerial remote sensing data acquisition and processing, this paper introduced the GPU parallel processing in orthorectification algorithm. Meanwhile, our experiments verified the correctness and feasibility of CUDA parallel processing algorithm, and the algorithm can effectively solve the problem of calculation large, time-consuming for ortho rectification process, realized fast processing of UAV airborne remote sensing image orthorectification based on GPU. The experimental results indicate that using the assumption of same accuracy of proposed method with CPU, the processing time is reduced obviously, maximum acceleration can reach more than 12 times, which greatly enhances the emergency surveying and mapping processing of rapid reaction rate, and has a broad application.
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 5
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    Distortion correction algorithm for UAV remote sensing image based on CUDA (2014)
    Institute of Physics (IOP)
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    Publication Date: 2014-03-19
    Description: In China, natural disasters are characterized by wide distribution, severe destruction and high impact range, and they cause significant property damage and casualties every year. Following a disaster, timely and accurate acquisition of geospatial information can provide an important basis for disaster assessment, emergency relief, and reconstruction. In recent years, Unmanned Aerial Vehicle (UAV) remote sensing systems have played an important role in major natural disasters, with UAVs becoming an important technique of obtaining disaster information. UAV is equipped with a non-metric digital camera with lens distortion, resulting in larger geometric deformation for acquired images, and affecting the accuracy of subsequent processing. The slow speed of the traditional CPU-based distortion correction algorithm cannot meet the requirements of disaster emergencies. Therefore, we propose a Compute Unified Device Architecture (CUDA)-based image distortion correction algorithm for UA...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 6
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    Spatial multiplexing plasmonic metalenses based on nanometer cross holes (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-12-15
    Description: Metasurfaces enable a spatially varying optical response to mold optical wavefronts into shapes that can be designed at will. Recurring to the excellent metasurfaces, spatial multiplexing metalens with multiple focal spots distributing along the transverse or longitudinal direction and vortex metalens with controllable topological charge are performed. These metalenses are composed of identical cross holes etched on the silver film and each cross hole can be taken as an equivalent half wave plate. The proposed spatial multiplexing metalenses can focus the light beam and spin the wave front, and their advantages of multifunction, high signal-to-noise ratio and ease to manipulate are favorable for expanding the application of plasmonic metalenses in optical manipulation.
    Electronic ISSN: 1367-2630
    Topics: Physics
    Published by Institute of Physics (IOP)
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  • 7
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    Research on Application of Machine Learning in Data Mining (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-08-04
    Description: Data mining has been widely used in the business field, and machine learning can perform data analysis and pattern discovery, thus playing a key role in data mining application. This paper expounds the definition, model, development stage, classification and commercial application of machine learning, and emphasizes the role of machine learning in data mining. Understanding the various machine learning techniques helps to choose the right method for a specific application. Therefore, this paper summarizes and analyzes machine learning technology, and discusses their advantages and disadvantages in data mining.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 8
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    Achievement of quality management system ISO 9001:2015 strategy in Vocational High School (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-10-10
    Description: The purpose of this research is to find out the strategy to achieve the ISO 9001:2015 quality management system in Vocational High School in Malang. Strategies found in this research when applied correctly enable the certification of the ISO 9001:2015 standard. In order to further enhance the success of obtaining the certification, commitment and continues support from the school principal, president, as well as forming a plenary, education, and training teams and bringing in external auditors will be required. Implementation of ISO 9001 based quality management has a positive impact on school performance and activities. The strategy of achievement of ISO 9001:2015 version emphasized risk register compared to the previous version, which is the ISO 9001:2008 where risk register is not taking into account. The risk register is a preventive action that reduces the risk that occurs. Therefore, ISO version 2015 becomes a novelty quality management system because the additions of risk...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 9
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    A Novel Broadband High Sensitivity Current Probe Design and Analysis for Conducted Emission Testing (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-10-12
    Description: Current probe is one of the most important measurement equipments in electromagnetic compatibility (EMC) for electromagnetic conducted emission testing. The measurement sensitivity of the current probe can directly affect the testing results. A novel broadband high sensitivity current probe is designed and analyzed by combining calculation method of equivalent circuit and high frequency electromagnetic field. The Fe based microcrystalline is used for the magnetic core of the novel current probe. The structure dimension is determined according to simulations and analyses. The novel current probe is compared with the commercial current probes by practical testing. The testing results show that the sensitivity indexes of the novel current probe surpass that of the commercial ones nearly 10 dB from 20 Hz to 10 kHz. Besides, the transfer impedance indexes of the novel current probe could attain the performance of commercial probes from 10 kHz to 500 MHz.
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 10
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    Influences of application of slow-release Nano-fertilizer on green pepper growth, soil nutrients and enzyme activity (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-12-21
    Description: In order to examine the fertilizer effect of slow-release Nano-fertilizer and its impact on the ecological environment, a cultivation pot experiment was arranged to study the influences of application of slow-release Nano-fertilizer on green pepper growth, soil Nutrients, enzyme activity and microorganisms. The experiment was designed to have four treatments: treatment 1 (blank treatment), treatment 2 (slow-release Nano-fertilizer), treatment 3 (composite chemical fertilizer), treatment 4 (slow-release Nano-fertilizer + compound fertilizer), and each treatment was five parallels. The results were as follows: (1) The application of slow-release Nano-fertilizer can promote the growth of green pepper, but due to the slow effect of fertilizer, the growth of green pepper was not as good as that of chemical fertilizer. (2) Application of slow-release Nano-fertilizer significantly increased soil nutrients, especially alkaline nitrogen, with an increase of 100.0%. (3) Application of slo...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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