Currently, residential area renovation in urban planning is facing many problems. Traditional sensitivity analysis methods are often difficult to handle. Therefore, this article proposes a comprehensive method that co...
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The effect of alcoholic polyethylene-vinyl acetate(EVA) product ethylene-vinyl alcohol copolymer(EVAL)on the low-temperature flow properties of model oil containing asphaltene(ASP) was *** change of wax crystal micros...
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The effect of alcoholic polyethylene-vinyl acetate(EVA) product ethylene-vinyl alcohol copolymer(EVAL)on the low-temperature flow properties of model oil containing asphaltene(ASP) was *** change of wax crystal microscopic morphology of model oil before and after modification were examined,and the influence of asphaltene mass fraction on the rheological improvement effect of EVAL was *** composite system of EVAL and asphaltene significantly reduced the pour point,gel point,apparent viscosity,storage modulus and loss modulus of waxy oil at low *** the EVAL concentration is 400 ppm and the asphaltene mass fraction is 0.5 wt%,the synergistic effect of the two is optimal,which can reduce the pour point by 17℃ and the modulus value by more than 98%.The introduction of EVAL strengthens the interaction between asphaltenes and wax crystals,forming EVALASP aggregates,which promote the adsorption of wax crystals on asphaltenes to form composite particles,and the polar groups prevent the aggregation of wax crystals and reduce the size of wax crystals,thus greatly improving the fluidity of waxy oils.
Carbon fibre,steel fibre and graphite were used as conductive fillers to prepare cementitious materials with excellent electrothermal *** electrically conductive cementitious materials with different volume dosages we...
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Carbon fibre,steel fibre and graphite were used as conductive fillers to prepare cementitious materials with excellent electrothermal *** electrically conductive cementitious materials with different volume dosages were analysed through compressive and flexural strength,electrochemical impedance spectroscopy and temperature rise *** equivalent circuit model was established to study the electrically conductive heat generation mechanism in the electrically conductive cementitious *** results indicate that the mechanical properties of cementitious composite materials with a ternary conductive phase are better than those of pristine cementitious materials because the fibrous filler improves their mechanical ***,the incorporation of graphite in the material reduces its *** fibrous and point-like conductive phase materials into the cementitious material enhances the overall conductive pathway and considerably reduces the electrical resistance of the cementitious material,enhancing its conductive *** volume ratios of carbon fibre,steel fibre and graphite that achieve an optimal complex doping in the cementitious material were 0.35%,0.6%and 6%,*** was determined using the mutation point of each circuit element parameter as the percolation *** addition,at a certain safety voltage,there is a uniform change between the internal and surface temperatures of the conductive cementitious material,and the heating effect in this materialis is considerably better than that in the pristine cementitious material.
Calibrating the building energy simulation(BES)models is a typical way to bridge energy performance gaps for existing ***,evidence-based and data-driven calibration are both widely used and have their advantages and *...
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Calibrating the building energy simulation(BES)models is a typical way to bridge energy performance gaps for existing ***,evidence-based and data-driven calibration are both widely used and have their advantages and ***,a systematic approach to combining the advantages of these two approaches has not been *** study performed evidence-based and data-driven calibration consecutively using a real-world data-rich building,assuming different scenarios of data availability.24 intermediate and ultimate models were obtained and comprehensively evaluated,by inspecting the calibrated parameters,calculating the predictive errors,and evaluating the energy conservation *** is shown that a satisfactory CV(RMSE)could be achieved even without any detailed evidence about the building,which was misleading due to the drifted parameter ***,data acquisition recommendations were made considering the importance and acquisition ***,despite similarly low errors,different models can estimate monthly energy savings and percentages with discrepancies exceeding 1000 kWh and 10%.Using a“calibrated”model without knowing the potential risk,the cascading performance gaps can lead to wrong decisions.
It is important to analyze the damage evolution process of surrounding rock under different water content for the stability of engineering rock *** on digital speckle correlation(DSCM),acoustic emission(AE)and electro...
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It is important to analyze the damage evolution process of surrounding rock under different water content for the stability of engineering rock *** on digital speckle correlation(DSCM),acoustic emission(AE)and electromagnetic radiation(EMR),uniaxial hierarchical cyclic loading and unloading tests were carried out on sandstones with different fracture numbers under dry,natural and saturated water content,to explore the fracture propagation,failure precursor characteristics and damage response mechanism under the influence of water content *** results show that with the increase of water content,the peak stress and crack initiation stress decrease gradually,and the decreases are 15.28%-21.11%and 17.64%-23.04%,*** peak strain and crack initiation strain increase gradually,and the increases are 19.85%-44.53%and 19.15%-41.94%,*** precracked rock with different water content is mainly characterized by tensile failure at different loading ***,with the increase of water content,the proportion of shear cracks gradually increases,while acoustic emission events gradually decrease,the dissipative energy and energy storage limits of the rock under peak load gradually decrease,and the charge signal increases significantly,which is because the lubrication effect of water reduces the friction coefficient between crack surfaces.
Eutrophication is a significant challenge for surface water,with sediment phosphorus(P)release being a key *** biological aluminum-based P-inactivation agent(BA-PIA)has shown effectiveness in controlling P release fro...
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Eutrophication is a significant challenge for surface water,with sediment phosphorus(P)release being a key *** biological aluminum-based P-inactivation agent(BA-PIA)has shown effectiveness in controlling P release from sediment,the efficiency and mechanism by BA-PIA capping is still not fully *** study explored the efficiency and mechanism of using BA-PIA capping controlling P release from *** main mechanisms controlling P release from sediment via BA-PIA capping involved transforming mobile and less stable fractions into stable ones,passivating DGT-labile P and establishing a 13 mm’P static layer’within the ***,BA-PIA’s impact on Fe redox processes significantly influenced P release from the *** BA-PIA capping,notable reductionswere observed in total P,soluble reactive P(SRP),and diffusive gradient in thin-films(DGT)-measured labile P(DGT-labile P)concentration in the overlying water,with reduction rates of 95.6%,92.7%,and 96.5%,*** BA-PIA capping,the diffusion flux of SRP across the sediment-water interface and the apparent P diffusion flux decreased by 91.3%and 97.8%,***,BA-PIA capping led to reduced concentrations of SRP,DGT-labile P,and DGT-measured labile Fe(II)in the sediment interstitial ***,BA-PIA capping significantly reduced P content and facilitated transformation in the 0∼30 mm sediment layers but not in the 30∼45 mm and 45∼60 mm sediment layers for NaOH-extractable inorganic P and HCl-extracted *** findings offer a theoretical basis and technical support for the practical application of BA-PIA capping to control P release from sediment.
Optimization problems aim to identify the best solution from a wide range of possibilities. The Particle Swarm Optimization (PSO) algorithm is widely recognized for its simplicity and efficiency, but it suffers from i...
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Engagement and motivation are critical factors in effective learning, particularly in educational contexts that require deep understanding and retention, such as architectural history. This study investigates the role...
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Since lightweight steel structures are one of the most important aspects of prefabricated building construction, very little research has been perf...
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This study investigates the application of the Fruit Fly Optimization Algorithm (FOA) in enhancing the predictive performance of the Light Gradient Boosting Machine (LightGBM) model for smart sustainable architecture....
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