The structural design parameters of a plastic centrifugal pump were calculated and modeled,and flow field simulation analysis of the model was performed using CFD,in the framework of an orthogonal design method(or exp...The structural design parameters of a plastic centrifugal pump were calculated and modeled,and flow field simulation analysis of the model was performed using CFD,in the framework of an orthogonal design method(or experiment).The inlet mounting angleβ1,outlet mounting angleβ2,wrap angleϕ,and impeller inlet diameter D1 of the pump impeller were the four factors assumed for the application of the orthogonal experiment,using the efficiency and Net Positive Suction Head(NPSH)as evaluation indices.Moreover,taking the maximum efficiency and minimum NPSH of the plastic centrifugal pump as the evaluation factors,the parameters of the pump impeller were re-optimized through the Taguchi algorithm(leading to the following optimal combination:inlet diameter 35 mm,inlet angle 26°,outlet angle 27°,and wrap angle 110°).The minimum NPSH and the maximum efficiency have been found to be 0.957%and 61.5%,respectively.展开更多
The aim of the study is to determine the optimal structural parameters for a plastic centrifugal pump inducer within the framework of an orthogonal experimental method.For this purpose,a numerical study of the related...The aim of the study is to determine the optimal structural parameters for a plastic centrifugal pump inducer within the framework of an orthogonal experimental method.For this purpose,a numerical study of the related flow field is performed using CFX.The shaft power and the head of the pump are taken as the evaluation indicators.Accordingly,the examined variables are the thickness(S),the blade cascade degree(t),the blade rim angle(β1),the blade hub angle(β2)and the hub length(L).The impact of each structural parameter on each evaluation index is examined and special attention is paid to the following combinations:S2 mm,t 2,β1235°,β2360°and L 140 mm(corresponding to a maximum head of 98.15 m);S 5 mm,t 1.6,β1252°,β2350°and L 140 mm(corresponding to a minimum shaft power of 63.06 KW).Moreover,using least squares and fish swarm algorithms,the pump shaft power and head are further optimized,yielding the following optimal combination:S 5 mm,t 1.9,β1252°,β2360°and L 145 mm(corresponding to the maximum head of 91.90 m,and a minimum shaft power of 64.83 KW).展开更多
Vertical infusion(self-emptying)bags used for Intravenous infusion are typically obtained by moulding a soft envelope of polypropylene.In normal conditions a continuous flow of liquid can be obtained with no need to u...Vertical infusion(self-emptying)bags used for Intravenous infusion are typically obtained by moulding a soft envelope of polypropylene.In normal conditions a continuous flow of liquid can be obtained with no need to use a pump.In the present study,the relationship between air pressure effects and the drug drip rate have been investigated experimentally and numerically.After determining relevant experimental data about the descending height of liquid level,the dropping speed and pressure,the ordinary least square method and MATLAB have been used to reconstruct the related variation and interrelation laws.Numerical simulations have been performed to determine the best gas-liquid volume ratio and improve the overall performances of these bags.According to these results,that the biggest effect on the drip rate is produced by the diameters of the used needles.展开更多
N-heterocyclic carbene(NHC)polymers,characterized by abundant nitrogen sources,tunable metal centers and excellent chemical stability,serve as ideal precursors for metal-incorporated N-doped carbon materials.Herein,li...N-heterocyclic carbene(NHC)polymers,characterized by abundant nitrogen sources,tunable metal centers and excellent chemical stability,serve as ideal precursors for metal-incorporated N-doped carbon materials.Herein,ligand engineering and temperature-induced strategies are employed to fabricate NHC-derived N/metal dual-doped carbon materials(CN-X-700,X=Cu,Cu/Co,and Co)with two-dimensional nanoribbon morphology.The optimized carbonization temperature endows CN-X-700 with substantial N-doping levels,numerous defects and moderate electrical conductivity.These structural advantages balance polarization and conductive losses,thereby elevating dielectric dissipation.More importantly,the Cu/Co bimetallic heterointerfaces significantly improve the electromagnetic wave(EMW)absorption capability by combining impedance matching and multiple synergistic losses,including magnetic loss,interfacial polarization and conductive loss.The comparison shows that CN-Cu/Co-700 exhibits superior loss capacity and a broad absorption range,with a minimum reflection loss(RL_(min))of-62.24 dB and an effective absorption bandwidth(EAB)covering 7.11 GHz(10.53–17.64 GHz).This study reveals the intrinsic relationship between heterointerfaces,multi-loss mechanisms and EMW dissipation,providing a novel structural regulation strategy for designing high-performance carbon-based microwave absorbers.展开更多
Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)has been the most prominent conducting polymer due to its outstanding electrical properties,chemical stability,biocompatibility,and commercial availab...Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)has been the most prominent conducting polymer due to its outstanding electrical properties,chemical stability,biocompatibility,and commercial availability.In this mini review,we aimto comprehensively outline the chemical approaches employed in tailoring PEDOT:PSS for bioelectronic applications.We open our discussion by showcasing various synthetic techniques and commercially accessible forms of PEDOT:PSS,providing practical advice and approaches to greatly enhance its electrical properties,and presenting diverse chemical designs and processing methods that are essential for converting PEDOT:PSS into different form factors,such as fibers,gels,and films,for integration a range of device structures.Additionally,we explore several burgeoning applications of PEDOT:PSS in bioelectronics,ranging from wearable health monitoring to implantable neural interfaces,underscoring its essential impact on improving device efficiency and biological compatibility,as it opens avenues for innovative diagnostic and therapeutic techniques in the realm of precision medicine.Concluding with an outlook,the review presents insights into the ongoing challenges and future research paths for PEDOT:PSS in the ever-evolving landscape of bioelectronics.We emphasize the need for continued innovation in materials science and engineering to further harness the full potential of this dynamic domain.展开更多
基金This article belongs to the project of the“The University Synergy Innovation Program of Anhui Province(GXXT-2019-004)”.
文摘The structural design parameters of a plastic centrifugal pump were calculated and modeled,and flow field simulation analysis of the model was performed using CFD,in the framework of an orthogonal design method(or experiment).The inlet mounting angleβ1,outlet mounting angleβ2,wrap angleϕ,and impeller inlet diameter D1 of the pump impeller were the four factors assumed for the application of the orthogonal experiment,using the efficiency and Net Positive Suction Head(NPSH)as evaluation indices.Moreover,taking the maximum efficiency and minimum NPSH of the plastic centrifugal pump as the evaluation factors,the parameters of the pump impeller were re-optimized through the Taguchi algorithm(leading to the following optimal combination:inlet diameter 35 mm,inlet angle 26°,outlet angle 27°,and wrap angle 110°).The minimum NPSH and the maximum efficiency have been found to be 0.957%and 61.5%,respectively.
基金project of the“The University Synergy Innovation Program of Anhui Province(GXXT-2019-004)”,“Natural Science Research Project of Anhui Universities(KJ2021ZD0144)”,“Wuhu Key R&D Project:Research and Industrialization of Intelligent Control Method of Engine Energy-Feeding Hydraulic Semi-Active Mount”.
文摘The aim of the study is to determine the optimal structural parameters for a plastic centrifugal pump inducer within the framework of an orthogonal experimental method.For this purpose,a numerical study of the related flow field is performed using CFX.The shaft power and the head of the pump are taken as the evaluation indicators.Accordingly,the examined variables are the thickness(S),the blade cascade degree(t),the blade rim angle(β1),the blade hub angle(β2)and the hub length(L).The impact of each structural parameter on each evaluation index is examined and special attention is paid to the following combinations:S2 mm,t 2,β1235°,β2360°and L 140 mm(corresponding to a maximum head of 98.15 m);S 5 mm,t 1.6,β1252°,β2350°and L 140 mm(corresponding to a minimum shaft power of 63.06 KW).Moreover,using least squares and fish swarm algorithms,the pump shaft power and head are further optimized,yielding the following optimal combination:S 5 mm,t 1.9,β1252°,β2360°and L 145 mm(corresponding to the maximum head of 91.90 m,and a minimum shaft power of 64.83 KW).
基金This article belongs to the project of“The University Synergy Innovation Program of Anhui Province(GXXT-2019-004)”“Teaching Research Project of Anhui Education Department(2019jyxm0229)”.
文摘Vertical infusion(self-emptying)bags used for Intravenous infusion are typically obtained by moulding a soft envelope of polypropylene.In normal conditions a continuous flow of liquid can be obtained with no need to use a pump.In the present study,the relationship between air pressure effects and the drug drip rate have been investigated experimentally and numerically.After determining relevant experimental data about the descending height of liquid level,the dropping speed and pressure,the ordinary least square method and MATLAB have been used to reconstruct the related variation and interrelation laws.Numerical simulations have been performed to determine the best gas-liquid volume ratio and improve the overall performances of these bags.According to these results,that the biggest effect on the drip rate is produced by the diameters of the used needles.
基金support provided by the National Natural Science Foundation of China(Nos.22375166,22475170,W2433032)Natural Science Basic Research Program of Shaanxi(No.2024JC-JCQN-44)Innovation Capability Support Program of Shaanxi Science and Technology Innovation Team Project(No.2025RS-CXTD-024).
文摘N-heterocyclic carbene(NHC)polymers,characterized by abundant nitrogen sources,tunable metal centers and excellent chemical stability,serve as ideal precursors for metal-incorporated N-doped carbon materials.Herein,ligand engineering and temperature-induced strategies are employed to fabricate NHC-derived N/metal dual-doped carbon materials(CN-X-700,X=Cu,Cu/Co,and Co)with two-dimensional nanoribbon morphology.The optimized carbonization temperature endows CN-X-700 with substantial N-doping levels,numerous defects and moderate electrical conductivity.These structural advantages balance polarization and conductive losses,thereby elevating dielectric dissipation.More importantly,the Cu/Co bimetallic heterointerfaces significantly improve the electromagnetic wave(EMW)absorption capability by combining impedance matching and multiple synergistic losses,including magnetic loss,interfacial polarization and conductive loss.The comparison shows that CN-Cu/Co-700 exhibits superior loss capacity and a broad absorption range,with a minimum reflection loss(RL_(min))of-62.24 dB and an effective absorption bandwidth(EAB)covering 7.11 GHz(10.53–17.64 GHz).This study reveals the intrinsic relationship between heterointerfaces,multi-loss mechanisms and EMW dissipation,providing a novel structural regulation strategy for designing high-performance carbon-based microwave absorbers.
基金supported by the start-up funding from the University of Pennsylvania.
文摘Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)has been the most prominent conducting polymer due to its outstanding electrical properties,chemical stability,biocompatibility,and commercial availability.In this mini review,we aimto comprehensively outline the chemical approaches employed in tailoring PEDOT:PSS for bioelectronic applications.We open our discussion by showcasing various synthetic techniques and commercially accessible forms of PEDOT:PSS,providing practical advice and approaches to greatly enhance its electrical properties,and presenting diverse chemical designs and processing methods that are essential for converting PEDOT:PSS into different form factors,such as fibers,gels,and films,for integration a range of device structures.Additionally,we explore several burgeoning applications of PEDOT:PSS in bioelectronics,ranging from wearable health monitoring to implantable neural interfaces,underscoring its essential impact on improving device efficiency and biological compatibility,as it opens avenues for innovative diagnostic and therapeutic techniques in the realm of precision medicine.Concluding with an outlook,the review presents insights into the ongoing challenges and future research paths for PEDOT:PSS in the ever-evolving landscape of bioelectronics.We emphasize the need for continued innovation in materials science and engineering to further harness the full potential of this dynamic domain.
