- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Region-of-interest based image compression using the discrete Tchebichef transform in wireless visual sensor networks
摘要： Reducing the algorithmic complexity of image compression techniques is a major challenge in wireless image sensor networks (WISNs). Many image compression standards, such as JPEG and JPEG20 0 0, are unsuitable for implementation in WISNs because of their high energy consumption. In this paper, a solution to this problem is proposed. It consists of a region-of-interest (ROI) based image compression using the discrete Tchebichef transform (DTT).The main idea is about compressing only the ROI instead of the whole image. The DTT is used as an alternative to the discrete cosine transform (DCT) due to its low complexity and good energy compaction. Simulation results have shown that the proposed method reduces the number of arithmetic operations, the processing/transmission energy consumption and the amount of transmitted data. The savings obtained generally exceed 50%. Furthermore, it has a competitive compression e?ciency compared with the state-of-the-art image compression techniques.
关键词： WISNs,Discrete cosine transform,Region-of-interest coding,Image compression,Energy consumption,Discrete Tchebichef transform
更新于2025-09-10 09:29:36
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Solar Water Pump
摘要： Solar powered water pumping systems have become the interest of many people in the recent years. Acknowledging that nature has provided a bounty of energy which can be converted into electrical energy has created innovative ways of discovering materials that can be used to make a system that supports turning heat into electricity. In this regard, the paper presented different concepts that relate to how the whole energy creation process is done and discusses useful ways of turning heat into useful energy. Furthermore, the recommendations dictate that while advancements in the technology are given attention, the issue of the investment cost and how it will thrive in the market is still a question. Nevertheless, many developing and developed countries continue to express interest in this area, and most are actively using and exploring how solar power can be used in other ways. Photovoltaic systems which are used to pump water for people, livestock and plants are an important move for technology and use of solar energy. Pumping water system using this PV technology has shown that is simple and that it does not require a lot of maintenance. In this regard, the idea gained the interest of farmers whose main concern is providing sufficient water not only for themselves but also for their plants and crops and livestock. The only major difference to this is that the system relies on solar energy as a power source for the pumps.
关键词： Energy,Direct Current (DC),Photovoltaic Energy,Electric Power Plant,Array,Photovoltaic (PV) System,Displaced or Volumetric Pump,Energy Consumption
更新于2025-09-09 09:28:46
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Encyclopedia of Wireless Networks || Energy Modeling for Nanoscale Terahertz Communication
摘要： Energy modeling for nanoscale terahertz communication is required to investigate the relationship between energy harvesting and consumption in nanoscale terahertz communication and analyze the trade-off between them by jointly considering the constraints of nanonetworks and the peculiarities of terahertz communications, in order to achieve perpetual nanonetworks.
关键词： Energy consumption,Nanoscale communication,Terahertz,Energy harvesting
更新于2025-09-09 09:28:46
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End-of-life of silicon PV panels: A sustainable materials recovery process
摘要： In this paper, the management of end-of-life PV modules based on an advanced eco-sustainable process has been presented and discussed. The thermal removal of the polymeric compounds contained in c-Si PV modules has been investigated to separate and recover Si, Ag, Cu, Al and glass. A two-step thermal process has been employed. In the first step, the rear polymeric layer has been removed without emissions of dangerous fluorinated substances. In the second step, the remaining polymers have been completely removed with low volatile organic compounds (VOCs) emissions. The polymers degradation has been studied at combustion equivalent ratios U varying from 0.5 to 2 and at 500 °C. The materials recovery has been evaluated from an environmental point of view and optimized by considering the energy cost, through the identification of the best operating conditions, in terms of temperature, time, atmosphere and gas flow. One hour of heat treatment and a slightly oxidizing atmosphere have been enabled to separate and recover the different materials of the module. The elemental compositions of the PV sample and the residue condensed organic products have been determined. The gaseous degradation products have been characterized by gas chromatographic analysis (GC).
关键词： Recycling,Photovoltaic module,Thermal treatment,Polymer removal,Energy consumption
更新于2025-09-09 09:28:46
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Influence of exposure time on energy consumption and mechanical properties of SLM fabricated parts
摘要： Purpose – Many process parameters in selective laser melting (SLM) can be con?gured to optimize build time, which directly relates to energy consumption, and to achieve acceptable part quality. This study aims to investigate whether energy can be effectively reduced with acceptable mechanical properties. The in?uence of exposure time is primarily focused to correlate energy consumption to mechanical properties. Design/methodology/approach – Through single-factor design and experiment result analysis, three levels of exposure time were examined in fabricating two sets of sample parts, for energy analysis and mechanical property tests. Manufacturing power pro?le was measured online, and four mechanical properties, tensile, ?exural, torsional strengths and part density, were investigated. A graphical growth rate tendency (GRT) plot is proposed to jointly analyze multiple variables. Findings – Energy consumption increases in fabricating a same part with the increase of exposure time in the tested range, but exposure time was found to in?uence build power rather than build time in the given SLM system. Mechanical properties do not increase linearly, and grow at different rates. It is found that within the tested range, increased energy consumption brought to a small improvement of part density, but a notable improvement of tensile strength and maximum torque. Practical implications – Producing quality SLM parts can be energy-effective through quantitative study. The proposed GRT plot is an intuitive visual aid to compare the growth rates of different variables, which offers more information to additive manufacturing practitioners. Originality/value – In this research, energy consumption and mechanical property are jointly analyzed for the ?rst time to advance the knowledge of energy-effective SLM fabrication. This helps additive manufacturing technology to be truly energy-ef?cient and environmental-friendly.
关键词： Mechanical properties,Energy consumption,Selective laser melting,Exposure time
更新于2025-09-09 09:28:46