In order to enhance the safety of personnel involved in water rescue and training missions, it is necessary to rapidly detect and forecast hazardous waters in real time. In this study, a device for detecting and alert...
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Biomass carbon has the advantage of a wide spectral absorption range, which makes it great potential for solar thermal utilization. In this study, porous skeleton support materials of sugarcane-derived carbon were pre...
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Biomass carbon has the advantage of a wide spectral absorption range, which makes it great potential for solar thermal utilization. In this study, porous skeleton support materials of sugarcane-derived carbon were prepared by freeze-drying-high-temperature carbonization method using natural sugarcane as raw material, and the characterization results demonstrate that the porous skeleton of sugarcane-derived carbon has outstanding porous support properties. By combining CuS with sugarcane-derived carbon, a porous material with outstanding photothermal conversion performance was synthesized. Four photo-thermal composite phase change materials（CPCMs） were prepared, the maximum loading mass of the support material C600 to the phase change materials（PCMs） reached 79.77 %. The C600-CuS-OC had excellent thermal storage properties with an enthalpy of melting of 276.3 J/g and a thermal conductivity of 0.61 W·m-1·K-1. The photo-thermal conversion efficiency of C600-CuS-OC was 83.2 %. Sugarcane carbon-based CPCMs are a low-cost and high-efficiency solar thermal storage material, which has great potential for applications in solar thermal storage, biomass utilization, and thermal management.
Germanium,a critical yet often overlooked metal,has experienced significant shifts in its global market,largely driven by China’s dominant ***,concerns are growing over the sustainability of germanium supply in China...
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Germanium,a critical yet often overlooked metal,has experienced significant shifts in its global market,largely driven by China’s dominant ***,concerns are growing over the sustainability of germanium supply in China due to imbalances in mining,manufacturing,recycling,and rising *** this study,we employ substance flow analysis to provide a quantitative assessment of China’s germanium flow system in 2019,and we project future demand and anthropogenic mineral generation up to 2050 using stock-driven *** results indicate that by 2050,domestic demand for germanium will increase to 164–187 t—double the demand in 2019—with infrared optics and solar cells being the primary drivers.A supply shortage is anticipated before 2040,although recycling through urban mining could meet around 30%of the *** findings underscore the urgent need to address emerging supply challenges and offer critical insights for policymakers and stakeholders to inform strategic decision-making.
In order to enhance the safety of personnel involved in water rescue and training missions,it is necessary to rapidly detect and forecast hazardous waters in real *** this study,a device for detecting and alerting to ...
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In order to enhance the safety of personnel involved in water rescue and training missions,it is necessary to rapidly detect and forecast hazardous waters in real *** this study,a device for detecting and alerting to torrents has been developed using a deep learning object detection *** target detection,dangerous points in torrent waters are identified and ***,the intensity of rapids is analyzed in order to enhance perceptual *** findings indicate that the convolutional neural network is capable of successfully detecting and recognizing discontinuous target *** field measurements,the device demonstrates a strong sensing alarm *** practical significance lies in further enhancing the rescue personnel's ability to perceive and predict the risks of hazardous factors such as *** application of the device also improves the efficiency and safety of water rescue.
The vertical position of the smoke layer within the cable compartment of a utility tunnel plays a pivotal role in governing the dynamics of smoke emission. Given the scarcity of existing research in this area, the pre...
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Reducing casualties and property losses through effective evacuation route planning has been a key focus for researchers in recent *** part of this effort,an enhanced sparrow search algorithm(MSSA)was ***,the Golden S...
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Reducing casualties and property losses through effective evacuation route planning has been a key focus for researchers in recent *** part of this effort,an enhanced sparrow search algorithm(MSSA)was ***,the Golden Sine algorithm and a nonlinear weight factor optimization strategy were added in the discoverer position update stage of the SSA ***,the Cauchy-Gaussian perturbation was applied to the optimal position of the SSA algorithm to improve its ability to jump out of local ***,the local search mechanism based on the mountain climbing method was incorporated into the local search stage of the SSA algorithm,improving its local search *** evaluate the effectiveness of the proposed algorithm,the Whale Algorithm,Gray Wolf Algorithm,Improved Gray Wolf Algorithm,Sparrow Search Algorithm,and MSSA Algorithm were employed to solve various test *** accuracy and convergence speed of each algorithm were then compared and *** results indicate that the MSSA algorithm has superior solving ability and stability compared to other *** further validate the enhanced algorithm’s capabilities for path planning,evacuation experiments were conducted using different maps featuring various obstacle ***,a multi-exit evacuation scenario was constructed according to the actual building environment of a teaching *** the sparrow search algorithm and MSSA algorithm were employed in the simulation experiment for multiexit evacuation path *** findings demonstrate that the MSSA algorithm outperforms the comparison algorithm,showcasing its greater advantages and higher application potential.
This paper evaluates the influence of natural ventilation on the longitudinal temperature attenuation of cable tunnel wall fires. It took into account the effects of different fuel quantities, cable types, cable layer...
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To determine the deicing force of forest fire preventive clothing, modified aided equipment for a universal testing machine was designed. Firstly, the cold situations were analyzed in five clothing climate zones of Ch...
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Integrated micro and nanostructures,heterogeneous components,defects,and interfaces is the way to develop high-performance microwave absorbing ***,there still needs to be more precise experimental routes and effective...
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Integrated micro and nanostructures,heterogeneous components,defects,and interfaces is the way to develop high-performance microwave absorbing ***,there still needs to be more precise experimental routes and effective *** this work,by a continuous process of vacuum sintering,hydrothermal,and carbon thermal reduction,magnetic FeCo nanoparticles were successfully embedded on the hollow double-shell mesoporous SiC@C surface,thus solving the challenges of a single component loss *** hollow double-shell nanostructure introduces air to enhance impedance matching while significantly reducing the density of the *** extensive defects and heterogeneous grain boundaries effectively enhance the polarization loss *** magnetic loss mechanism introduced by the magnetic particles effectively improves the impedance matching properties of the *** synergy of these multiple advantages has enabled the SCFC_(2)-8(here SiC@C@FeCo is abbreviated to SCFC,2 represents the initial metal ion content,and 8 represents the hydrothermal time)sample to achieve an adequate absorption bandwidth of 6.09 GHz at 2.0 *** a minimum reflection loss of-60.56 dB,the absorption bandwidth can cover the entire C,X,and Ku bands by adjusting the matching thickness(1.3–4.0 mm).This work provides a valuable paradigm for the deeper exploitation of microwave absorption potential and guides the development of other high-performance materials.
Achieving synergistic absorption of electromagnetic waves(EMWs)in the mid-high frequency and absorption band conversion is an urgent ***,the present solution is usually a straightforward mixture of magnetic component-...
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Achieving synergistic absorption of electromagnetic waves(EMWs)in the mid-high frequency and absorption band conversion is an urgent ***,the present solution is usually a straightforward mixture of magnetic component-carbon ***,we optimize the magnetic properties and electrical relaxation response from a chemical synthesis *** integrated design,the contents of carbon components and multi-dimensional morphology are controlled by retaining strong magnetic *** morphology design and the construction of heterogeneous interfaces will boost the intense response of charge in the surrounding to enhance the polarization *** multi-dimensional structure and electromagnetic(EM)properties of the sample after optimized engineering have an extremely powerful absorption conversion effect on EMW ***@C particles ultimately achieve synergistic absorption effects at low thickness(d<3.5 mm)at middle frequencies(6–10 GHz)and high frequencies(10.5–18 GHz).Our work establishes a correlation mechanism between the physical and chemical properties of materials and EM *** also provides insight into the synergistic absorption of EMWs in the mid-high frequency and absorption band conversion strategies.
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