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- rural electrification
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[IEEE 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Chengdu, China (2018.5.7-2018.5.11)] 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - A Low Power Consumption Wireless Sensor System with Wireless Power Harvesting for Oil Pipeline Monitoring
摘要： In this paper, a low power wireless sensor system for oil pipeline monitoring based on wireless energy harvesting is discussed. The system uses vibration sensor to detect the vibration state of the oil pipeline, and transmits the information to the sink node through the low power wireless sensor node which is supplied by wireless energy harvesting and rechargeable battery. Based on the introduction of the whole system construction, this paper focuses on the design of low-power wireless sensor nodes, including wireless energy harvesting, low-power wireless node circuit and low-power transmission protocol. The test results show that low power design strategy and wireless energy harvesting as energy supplement can effectively improve the practicability of the system.
关键词： wireless energy harvesting,oil pipeline monitoring,wireless sensor system,low power
更新于2025-09-04 15:30:14
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[IEEE 2018 International Conference on Smart Grid and Clean Energy Technologies (ICSGCE) - Sg. Long, Cheras, Kajang, Malaysia (2018.5.29-2018.6.1)] 2018 International Conference on Smart Grid and Clean Energy Technologies (ICSGCE) - Improving Rural Electrification through Interconnected Solar Micro Grids
摘要： Renewable energy based rural electrification system experiences fluctuation in generation efficiency due to various unpredictable dynamic changes such as solar irradiation levels, rainfall, dust accumulation, vegetation, etc. Due to these fluctuations the system experiences frequent power quality issues such as low voltage, power interruptions, operating the degradation of the performance and reliability of these solar micro grid systems. In this paper micro grid cluster interconnection methodology is proposed to improve the efficiency of the system. To develop real-time decisions on energy management and micro grid interconnections, we have designed an IoT system that is capable to monitor and learn the dynamic changes in power quality to control the subsystems for improving the quality of service. In this work we have analysed the need of such a system in one of the rural community having solar micro grid deployment in South India. Based on the needs we have designed and developed an end-to-end system consisting of perception layer, network layer and application layer. Detailed experimentation and laboratory and the evaluation was performed performance results are discussed in this paper.
关键词： rural electrification,optimised renewable energy utilisation,power sharing,micro grid,community development,grid interconnection
更新于2025-09-04 15:30:14
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Analysis of Public Subsidies to the Solar Energy Sector: Corruption and the Role of Institutions
摘要： This study investigates the connection between rent-seeking behaviour, corruption activity and quality of institutions to empirically evaluate the unexpected implications of an energy policy for criminal activity. The object of this research is a program of public subsidies introduced in Italy in 2005, which successfully boosted the solar energy sector but seems to have generated a growth of corruption activity, arisen from the opportunity of rent extraction. In particular, according to the main hypothesis of this research, bribery is expected to rise significantly where big photovoltaic plants are concentrated and administrative procedures are more complicated. To determine the causal effect of the subsidies on corruption, the study employs a Difference-in-Difference methodology on a sample of 76 Italian provinces and exploits solar radiation as exogenous variable to discriminate the profitability of investments and bribing. Results confirm that, in poor-institutions areas, the growth of the solar sector in sunniest provinces has gone hand in hand with increasing corruption. Results suggest that policy makers should pay additional attention to the potential distortions of public policies implying large rent opportunities, in areas where the weakness of institutional settings and the bureaucratic complexities encourage illegal behaviour.
关键词： Corruption,Public Subsidies,Renewable Energy,Legal Institutions
更新于2025-09-04 15:30:14
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[IEEE 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) - Atlanta, GA, USA (2017.10.21-2017.10.28)] 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) - Design of a Photoneutron Convertor for Energy Selective Neutron Imaging
摘要： Neutron imaging plays an essential role in the industrial applications, such as turbine blade manufacturing, fuel cell research, and nuclear fuel quality inspection. As isotopic neutron sources and neutron generators cannot provide high-intensity neutron beams, and neutron beam lines of research reactors or spallation neutron sources are very scarce, a cost-effective neutron source with high neutron yield and long life-span should be researched. The e-LINAC driven photoneutron source, which converts X-rays to photoneutrons, has been proved to be a robust neutron source that can realize neutron yield ranging from 1010 to 1015n/s. Hence it is a promising neutron source to provide neutron beams used for the neutron imaging. Because the e-LINAC works at a pulsed mode and the photoneutrons have a continuous energy spectrum, energy selective neutron imaging can thus be realized with the e-LINAC driven photoneutron source, with the aid of time of flight (TOF) technique. In this research, an e-LINAC driven photoneutron source is researched to strike the compromise between the neutron flux and the energy resolution. With a well-designed heavy water photon-to-neutron convertor, a 10 MeV/ 20 kW e-LINAC can provide a thermal neutron flux of 7.28×104n/cm2/s at 10 meters away from the electron target, with an energy resolution less than 20%. By using a low temperature (10K) moderator, the cold neutron flux at the same position can be 2.13×104n/cm2, and the energy resolution is less than 2%. This study may help realize the energy selective neutron imaging with an e-LINAC driven photoneutron source.
关键词： Neutron imaging,e-LINAC,energy selective neutron imaging,photoneutron source,time of flight (TOF)
更新于2025-09-04 15:30:14
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[IEEE 2018 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD) - Austin, TX, USA (2018.9.24-2018.9.26)] 2018 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD) - Topography Simulation of 4H-SiC-Chemical-Vapor-Deposition Trench Filling Including an OrientationDependent Surface Free Energy
摘要： Topography simulation of chemical-vapor-deposition (CVD) trench filling has been advanced as a tool for designing fabrication processes of high-voltage 4H-SiC superjunction devices. In the longitudinal section of filled stripe trenches, an experimentally observed dip, which had not been well reproduced with a previous technique using a fixed surface free energy (γ), came to be qualitatively reproduced by including an orientation dependence of γ.
关键词： orientation,SiC,surface free energy,CVD,trench
更新于2025-09-04 15:30:14
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Optimization and Characterization of High-Harmonic Generation for Probing Solid Density Plasmas
摘要： The creation of high energy density plasma states produced during laser–solid interaction on a sub-picosecond timescale opens a way to create astrophysical plasmas in the lab to investigate their properties, such as the frequency-dependent refractive index. Available probes to measure absorption and phase-changes given by the complex refractive index of the plasma state are extreme-UV (EUV) and soft X-ray (XUV) ultra-short pulses from high harmonic generation (HHG). For demanding imaging applications such as single-shot measurements of solid density plasmas, the HHG probe has to be optimized in photon number and characterized in intensity and wavefront stability from shot-to-shot. In an experiment, a coherent EUV source based on HHG driven by a compact diode-pumped laser is optimized in photons per pulse for argon and xenon, and the shot-to-shot intensity stability and wavefront changes are characterized. The experimental results are compared to an analytical model estimating the HHG yield, showing good agreement. The obtained values are compared to available data for solid density plasmas to con?rm the feasibility of HHG as a probe.
关键词： pump-probe,XUV,diode-pumped lasers,high energy density physics,high-harmonic generation
更新于2025-09-04 15:30:14
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Lidar arc scan uncertainty reduction through scanning geometry optimization
摘要： Doppler lidars are frequently operated in a mode referred to as arc scans, wherein the lidar beam scans across a sector with a ?xed elevation angle and the resulting measurements are used to derive an estimate of the n minute horizontal mean wind velocity (speed and direction). Previous studies have shown that the uncertainty in the measured wind speed originates from turbulent wind ?uctuations and depends on the scan geometry (the arc span and the arc orientation). This paper is designed to provide guidance on optimal scan geometries for two key applications in the wind energy industry: wind turbine power performance analysis and annual energy production prediction. We present a quantitative analysis of the retrieved wind speed uncertainty derived using a theoretical model with the assumption of isotropic and frozen turbulence, and observations from three sites that are onshore with ?at terrain, onshore with complex terrain and offshore, respectively. The results from both the theoretical model and observations show that the uncertainty is scaled with the turbulence intensity such that the relative standard error on the 10 min mean wind speed is about 30 % of the turbulence intensity. The uncertainty in both retrieved wind speeds and derived wind energy production estimates can be reduced by aligning lidar beams with the dominant wind direction, increasing the arc span and lowering the number of beams per arc scan. Large arc spans should be used at sites with high turbulence intensity and/or large wind direction variation.
关键词： arc scans,wind energy,Doppler lidar,scan geometry optimization,turbulence intensity
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE 6th Workshop on Wide Bandgap Power Devices and Applications (WiPDA) - Atlanta, GA, USA (2018.10.31-2018.11.2)] 2018 IEEE 6th Workshop on Wide Bandgap Power Devices and Applications (WiPDA) - 6.5kV SiC JFET-based Super Cascode Power Module with High Avalanche Energy Handling Capability
摘要： A new Super Cascode Power Module (SCPM) topology was designed, and a 6.5kV/100A implementation was fabricated and tested. Simulation and test results show 175kHz switching with 28ns switching time. Vulnerability to avalanche energy was observed, and a solution was proposed and verified with simulation. Simulation shows more than 99% of the avalanche energy is diverted to the power devices from balancing diodes, which have much smaller die size compared with the power device.
关键词： avalanche energy,super cascode,SiC JFET
更新于2025-09-04 15:30:14
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Estimating the Influence of Quantum Noises on the Quality of Material Identification by the Dual-Energy Method
摘要： A mathematical model has been developed to describe the radiation transparency of a test object with allowance for quantum noise. The technique of estimating the effective atomic number of the test object by the dual-energy method has been improved based on the analysis of radiation transparency with regard to necessary restrictions and recommendations. An algorithm is presented for the statistical evaluation of the influence of quantum noises on the quality of test-object material identification by the dual-energy method. An example is given of using the algorithm in a baggage and carry-on inspection system that has the maximum X-ray energies of 80 and 160 keV and is equipped with total-absorption detectors.
关键词： quantum noise,dual-energy method,effective atomic number,material identification,digital radiography
更新于2025-09-04 15:30:14
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Research and Development Work on Solar Assisted Drying Systems
摘要： The solar energy research group from Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia (UKM) has designed and constructed solar assisted drying systems for drying agricultural and marine products. This study is a review of numerous types of solar dryer systems developed by SERI, UKM. The classification of solar drying systems has divided by two namely air based solar collector systems and water based solar collector systems. Drying with solar assisted drying systems was found to be a viable option with many benefits such as protected drying environment, improved dried quality of products and reduces drying time compared with the traditional sun drying method. Therefore, SERI’s solar assisted drying system shows a great potential for application in drying process of agricultural and marine products.
关键词： solar collector,Solar assisted drying,solar thermal,solar energy
更新于2025-09-04 15:30:14