The park-level integrated energy system(PIES)is essential for achieving carbon neutrality by managing multi-energy supply and demand while enhancing renewable energy integration.However,current carbon trading mechanis...The park-level integrated energy system(PIES)is essential for achieving carbon neutrality by managing multi-energy supply and demand while enhancing renewable energy integration.However,current carbon trading mechanisms lack sufficient incentives for emission reductions,and traditional optimization algorithms often face challenges with convergence and local optima in complex PIES scheduling.To address these issues,this paper introduces a low-carbon dispatch strategy that combines a reward-penalty tiered carbon trading model with P2G-CCS integration,hydrogen utilization,and the Secretary Bird Optimization Algorithm(SBOA).Key innovations include:(1)A dynamic reward-penalty carbon trading mechanism with coefficients(μ=0.2,λ=0.15),which reduces carbon trading costs by 47.2%(from$694.06 to$366.32)compared to traditional tiered models,incentivizing voluntary emission reductions.(2)The integration of P2G-CCS coupling,which lowers natural gas consumption by 41.9%(from$4117.20 to$2389.23)and enhances CO_(2) recycling efficiency,addressing the limitations of standalone P2G or CCS technologies.(3)TheSBOA algorithm,which outperforms traditionalmethods(e.g.,PSO,GWO)in convergence speed and global search capability,avoiding local optima and achieving 24.39%faster convergence on CEC2005 benchmark functions.(4)A four-energy PIES framework incorporating electricity,heat,gas,and hydrogen,where hydrogen fuel cells and CHP systems improve demand response flexibility,reducing gas-related emissions by 42.1%and generating$13.14 in demand response revenue.Case studies across five scenarios demonstrate the strategy’s effectiveness:total operational costs decrease by 14.7%(from$7354.64 to$6272.59),carbon emissions drop by 49.9%(from 5294.94 to 2653.39kg),andrenewable energyutilizationincreases by24.39%(from4.82%to8.17%).These results affirmthemodel’s ability to reconcile economic and environmental goals,providing a scalable approach for low-carbon transitions in industrial parks.展开更多
Few-layer nanosheets(NSs)of hexagonal boron nitride(h-BN)and molybdenum disulfide(MoS_(2))display notable piezoelectric properties.Yet,their integration into polymers typically yields non-piezoelectric composites due ...Few-layer nanosheets(NSs)of hexagonal boron nitride(h-BN)and molybdenum disulfide(MoS_(2))display notable piezoelectric properties.Yet,their integration into polymers typically yields non-piezoelectric composites due to NSs’random distribution.We introduce a facile method for fabricating intrinsic piezoelectric composites incorporated with NSs without electric poling.Our innovative process aligns NSs within polyvinyl alcohol polymer,leveraging ice-water interfacial tension,water crystallization thrust,and directional cross-linking during freezing.The resulting PE composites exhibit a maximum piezoelectric coefficient of up to 25.5-28.4 pC N^(-1),comparable to polyvinylidene difluoride(PVDF),with significant costefficiency,safety,and scalability advantages over conventional materials.Using this composite,we develop highly sensitive wearable pressure and strain sensors,and an ultrasound energy harvester.These sensors detect finger bending and differentiate between walking and running,while the harvester generates1.18 V/2.31μA under 1Wcm^(-2)ultrasound input underwater.This universal method offers a novel manufacturing technique for piezoelectric composites,demonstrating remarkable effectiveness in synthesizing intrinsic piezoelectric composites based on 2D materials.Moreover,its potential extends to applications in wearable electronics and energy harvesting,promising significant advancements in these fields.展开更多
Metal alloy anode materials with high specific capacity and low voltage have recently gained significant attention due to their excellent electrochemical performance and the ability to suppress dendrite growth.However...Metal alloy anode materials with high specific capacity and low voltage have recently gained significant attention due to their excellent electrochemical performance and the ability to suppress dendrite growth.However,experimental investigations of metal alloys can be time-consuming and expensive,often requiring extensive experimental design and effort.In this study,we developed a machine learning model based on the Crystal Graph Convolutional Neural Network(CGCNN)to screen alloy anode materials for seven battery systems,including lithium(Li),sodium(Na),potassium(K),zinc(Zn),magnesium(Mg),calcium(Ca),and aluminum(Al).We utilized data with tens of thousands of alloy materials from the Materials Project(MP)and Automatic FLOW for Materials Discovery(AFLOW)databases.Without any experimental voltage input,we identified over 30 alloy systems that have been experimentally validated with good precision.Additionally,we predicted over 100 alloy anodes with low potential and high specific capacity.We hope this work to spur further interest in employing advanced machine learning models for the design of battery materials.展开更多
[Objectives]To apply the novel induction heating(IH)technology for the extraction of Ophiopogon japonicus polysaccharide(OJPS),fully utilize the advantages of IH technology to improve the extraction yield of OJPS,and ...[Objectives]To apply the novel induction heating(IH)technology for the extraction of Ophiopogon japonicus polysaccharide(OJPS),fully utilize the advantages of IH technology to improve the extraction yield of OJPS,and compare it with traditional Chinese medicine polysaccharide extraction methods.[Methods]Using the polysaccharide extraction yield as the evaluation index,the IH extraction process for OJPS was optimized through an L_(9)(3^(4))orthogonal test,and systematic methodological validation was conducted.Finally,the process parameters and procedure for extracting OJPS using IH technology were optimized.[Results]The optimal extraction process was as follows:solid-liquid ratio of 1:55,extraction time of 75 min,and alcohol precipitation ratio of 1:4.The methodological investigation showed that OJPS had a good linear relationship in the range of 20-140μg/mL,with R^(2)=0.9993.The average recovery rate was 99.94%(RSD=1.32%).The RSD s for precision,repeatability,and stability were all less than 2%,indicating that the measurement method for OJPS extraction yield was excellent.The extraction yields of OJPS by reflux extraction,ultrasonic extraction,and IH extraction were 26.67%,40.70%,and 51.74%,respectively.[Conclusions]The novel IH extraction technology is stable and reliable,has a significant impact on the extraction yield of OJPS,and also improves the conversion rate of OJPS.It is expected to become an emerging technology and research direction for the extraction of Chinese medicine polysaccharides.展开更多
We investigated the solid–liquid suspension characteristics in the tank with a liquid height/tank diameter ratio of 1.5 stirred by a novel long-short blades(LSB) impeller by the Euler granular flow model coupled with...We investigated the solid–liquid suspension characteristics in the tank with a liquid height/tank diameter ratio of 1.5 stirred by a novel long-short blades(LSB) impeller by the Euler granular flow model coupled with the standard k–ε turbulence model. After validation of the local solid holdup by experiments,numerical predictions have been successfully used to explain the influences of impeller rotating speed,particle density, particle size, liquid viscosity and initial solid loading on the solid suspension behavior,i.e. smaller particles with lower density are more likely to be suspended evenly in the liquid with higher liquid viscosity. At a low impeller rotating speed(N), increase in N leads to an obvious improvement in the solid distribution homogeneity. Moreover, the proposed LSB impeller has obvious advantages in the uniform distribution of the solid particles compared with single Rushton turbine(RT), dual RT impellers or CBY hydrofoil impeller under the same power consumption.展开更多
DNA methyltransferase 1(DNMT1)is a useful biomarker for lung cancer in early clinical diagnosis.A rapid magnetic chemiluminescence immunoassay(MCLIA)for DNMT1 in human serum has been developed.Horseradish peroxidase(H...DNA methyltransferase 1(DNMT1)is a useful biomarker for lung cancer in early clinical diagnosis.A rapid magnetic chemiluminescence immunoassay(MCLIA)for DNMT1 in human serum has been developed.Horseradish peroxidase(HRP)-second-Ab was used to labeled polyclonal antibodies of anti-DNMT1.DNMT1 in sample integrates with specific immunomagnetic beads and can constitute a supersandwiched immunoreaction.In magnetic field,nonspecific materials can be separated.After luminescent substrate luminol-H2O2-BIP was added,the relative light unit(RLU)of HRP was detected and was discovered to be directly proportional to the content of DNMT1 in sample.The correlative variables involved in the MCLIA value were optimized and the methodological evaluation was carried out.After optimization,in the range of0.5–128 ng/mL,the linear regression equation was y=0.5014 x+1.769(x was logCDNMT1,y was relative luminescence units(RLU)/RLU0),and the limit of detection was 0.01 ng/mL.The RSD of intra-and interassays were 15.8%–16.9%and 14.3%–18.1%,respectively.The recovery was from 70.0%to 106.2%.Furthermore,paralleled with purchasable enzyme-linked immunosorbent assay(ELISA)kits,MCLEIA had lower detection limit,wider linear range and shorter detection time.Therefore,the MCLEIA established in this study could be used for the sensitive detection of DNMT1 in serum sample.展开更多
The first-passage statistics of Duffing-Rayleigh- Mathieu system under wide-band colored noise excitations is studied by using stochastic averaging method. The motion equation of the original system is transformed int...The first-passage statistics of Duffing-Rayleigh- Mathieu system under wide-band colored noise excitations is studied by using stochastic averaging method. The motion equation of the original system is transformed into two time homogeneous diffusion Markovian processes of amplitude and phase after stochastic averaging. The diffusion process method for first-passage problem is used and the corresponding backward Kolmogorov equation and Pontryagin equation are constructed and solved to yield the conditional reliability function and mean first-passage time with suitable initial and boundary conditions. The analytical results are confirmed by Monte Carlo simulation.展开更多
This work focuses on the design improvement of the long-short blades(LSB)impeller by using pitched short blades(SBs)to regulate the flow field in the stirred vessel.After mesh size evaluation and velocity field valida...This work focuses on the design improvement of the long-short blades(LSB)impeller by using pitched short blades(SBs)to regulate the flow field in the stirred vessel.After mesh size evaluation and velocity field validation by the particle image velocimetry,large eddy simulation method coupled with sliding mesh approach was used to study the effect of the pitched SBs on the flow characteristics.We changed the inclined angles of the SBs from 30°to 60°and compared the flow characteristics when the impeller was operated in the down-pumping and up-pumping modes.In the case of down-pumping mode,the power number is relatively smaller and vortexes below the SBs are suppressed,leading to turbulence intensification in the bottom of the vessel.Whereas in the case of up-pumping mode,the axial flow rate in the center increased significantly with bigger power number,resulting in more efficient mass exchange between the axial and radial flows in the whole vessel.The LSB with 45°inclined angle of the SBs in the up-pumping mode has the most uniform distributions of flow field and turbulent kinetic energy compared with other impeller configurations.展开更多
A palladium-catalyzed cascade cyclization of allenylethylene carbonates with 1,3-indandiones was developed, providing biologically interesting tetracyclic dihydrocyclopentaindenofuranone derivatives having three conti...A palladium-catalyzed cascade cyclization of allenylethylene carbonates with 1,3-indandiones was developed, providing biologically interesting tetracyclic dihydrocyclopentaindenofuranone derivatives having three contiguous quaternary carbon centers in moderate to high yields with excellent diastereoselectivities. In this reaction, the allene moiety was fully fused into the cyclopentene ring.展开更多
The development of high-performance binders is a simple but effective approach to address the rapid capacity decay of high-capacity anodes caused by large volume change upon lithiation/delithiation.Herein,we demonstra...The development of high-performance binders is a simple but effective approach to address the rapid capacity decay of high-capacity anodes caused by large volume change upon lithiation/delithiation.Herein,we demonstrate a unique organic/inorganic hybrid binder system that enables an efficient in situ crosslinking of aqueous binders(e.g.,sodium alginate(SA)and carboxymethyl cellulose(CMC))by reacting with an inorganic crosslinker(sodium metaborate hydrate(SMH))upon vacuum drying.The resultant 3D interconnected networks endow the binders with strong adhesion and outstanding self-healing capability,which effectively improve the electrode integrity by preventing fracturing and exfoliation during cycling and facilitate Li^(+)ion transfer.SiO anodes fabricated from the commercial microsized powders with the SA/0.2SMH binder maintain 1470 mAh g^(-1)of specific capacity at 100 mA g^(-1)after 200 cycles,which is 5 times higher than that fabricated with SA binder alone(293 mAh g^(-1)).Nearly,no capacity loss was observed over 500 cycles when limiting discharge capacity at 1500 mAh g^(-1).The new binders also dramatically improved the performance of Fe_(2)O_(3),Fe_(3)O_(4),NiO,and Si electrodes,indicating the excellent applicability.This finding represents a novel strategy in developing high-performance aqueous binders and improves the prospect of using high-capacity anode materials in Li-ion batteries.展开更多
Aqueous zinc-ion batteries(ZIBs) are considered promising power sources for grid storage,but they face several issues,including dendrite growth,corrosion,hydrogen evolution,etc.,which are related to the Zn metal/liqui...Aqueous zinc-ion batteries(ZIBs) are considered promising power sources for grid storage,but they face several issues,including dendrite growth,corrosion,hydrogen evolution,etc.,which are related to the Zn metal/liquid electrolyte interface.To address these challenges,many researchers have focused on modifying the Zn anode with surface adsorption.However,the underlying mechanism between the Zn surface and adsorbed/protective molecules has not been thoroughly explored.In this study,we built a multiscale simulation platform that integrates state-of-art simulation methods to comprehensively investigate the adsorption process of amino acids on the Zn metal surface.Our major finding is that adsorption sites,adsorbate–surface angle,and average distance are critical parameters for the stability and strength of surface adsorption.Additionally,ab initio molecular dynamics reveal the kinetics of the surface adsorption and molecule reorientation processes.Specifically,it can be discovered that the amino acids prefer to align parallel to the Zn metal surface,leading to better surface protection against corrosion and preventing dendrite growth.These findings pave the way for an in-depth understanding of the surface adsorption process,as well as providing concrete design principles for stable Zn metal anodes.展开更多
This paper focuses on the general case （GC） airborne bistatic synthetic aperture radar （SAR） data processing, and a new analytical imaging algorithm based on the extended Loffeld＇s bistatic formula （ELBF） is pr...This paper focuses on the general case （GC） airborne bistatic synthetic aperture radar （SAR） data processing, and a new analytical imaging algorithm based on the extended Loffeld＇s bistatic formula （ELBF） is proposed. According to the bistatic SAR geometry, the track decoupling formulas that convert the bistatic geometry to the receiver-referenced geometry in a concise way are derived firstly. Then phase terms of ELBF are decomposed into two independent phase terms as the range phase term and the azimuth phase term in a new way. To get the focusing result, the bistatic deformation （BD） term is compensated in the two-dimensional （2- D） frequency domain, and the space-variances of the range phase term and the azimuth phase term are eliminated by chirp scaling （CS） and chirp z-transform （CZT）, respectively. The effectiveness of the proposed algorithm is verified by the simulation results.展开更多
In this work,a supersonic turbulent boundary layer with freestream Mach number 2.25 and Reynolds number based on the momentum thickness around 4000 is obtained by a direct numerical simulation.The wall-pressure fluctu...In this work,a supersonic turbulent boundary layer with freestream Mach number 2.25 and Reynolds number based on the momentum thickness around 4000 is obtained by a direct numerical simulation.The wall-pressure fluctuations are split into positive and negative families by the conditional correlation and clustering method.The negative wall-pressure fluctuation has smaller integral length scales than the positive one.But they have comparable integral time scales.Positive wall-pressure fluctuation is convected slightly faster than the negative one.Statistically,wall-pressure clusters are self-similarly packed on the wall,i.e.,the absolute distance between two wall-pressure clusters is proportional to their sizes.Closest pairs of wall-pressure clusters of the same sign are largely spanwise aligned.While wall-pressure clusters of the opposite signs are streamwise paired.Wall-pressure fluctuations are non-locally associated with wall shear stresses.The streamwise wall shear stress is largely downstream of the wall-pressure fluctuations.While the spanwise wall shear stress and wall-pressure are diagonally aligned in two opposite directions,their cross-correlation is a quadrupole with the two correlation lobes upstream of wall-pressure fluctuations being dominant.展开更多
Organic piezoelectric materials have attracted significant interest for applications in sensing,energy harvesting,and flexible electronics.However,its piezoelectric properties are yet to be improved.This study introdu...Organic piezoelectric materials have attracted significant interest for applications in sensing,energy harvesting,and flexible electronics.However,its piezoelectric properties are yet to be improved.This study introduces a facile strategy to fabricate homogenous and dense polyvinylidene fluoride(PVDF)films with high piezoelectric performance via anhydrous CaCl_(2)doping.The strong ion-dipole interaction between Ca^(2+)and F atoms,along with directional dipole alignment under an electric field at elevated temperature,as verified by molecular dynamics simulations and material characterizations.This results in an impressiveβ-phase content of 92.78%and a piezoelectric coefficient of 29.26 pm/V.A piezoelectric device fabricated from this PVDF film delivers an output voltage exceeding 12 V under external pressure and maintains stability over 60,000 cycles.When integrated with an LC resonant circuit,it functions as a wireless sensor for real-time motion monitoring.This scalable approach significantly advances piezoelectric polymer performance for practical applications.展开更多
Traditional ferroelectric materials,such as lead zirconate titanate(PZT)ceramics,exhibit positive strain when subjected to an electric field along the polarization direction.In contrast,the piezoelectric polymer polyv...Traditional ferroelectric materials,such as lead zirconate titanate(PZT)ceramics,exhibit positive strain when subjected to an electric field along the polarization direction.In contrast,the piezoelectric polymer polyvinylidene fluoride(PVDF)and its copolymer P(VDF-TrFE)display unique negative strain properties.While extensive research has focused on understanding the origin and mechanisms of this negative strain,limited efforts have been directed toward regulating these properties.This study optimizes the electro-strain and ferroelectric properties of P(VDF-TrFE)piezoelectric films through the synergistic effect of PbTiO_(3)nanosheets and an in-situ electrostatic field.Our results demonstrate that while the incorporation of PbTiO_(3)nanosheets does not notably enhance ferroelectricity,it significantly improves electro-strain properties,particularly negative strain,which increases from-0.097%to-0.185%,an enhancement of 91%.Moreover,the ferroelectric polarization and positive strain of P(VDF-TrFE)are further enhanced under the combined influence of PbTiO_(3)nanosheets and in-situ electrostatic field,increasing maximum polarization from 10.79μmC/cm^(2)to 13.16μmC/cm^(2),a 22%improvement,and positive strain from 0.213%to 0.267%,a 25%enhancement.We propose a possible mechanism for these improvements,attributed to the enhanced flexibility of the amorphous phase and increased content of polar b-phase in P(VDF-TrFE)films under this synergistic effect.This work highlights novel strategies for controlling the electro-strain and ferroelectric properties of P(VDF-TrFE)piezoelectric films.展开更多
The separation of electron-hole pairs while inhibiting their recombination under ultrasound irradiation is vital phenomena to the generation of reactive oxygen species(ROS)in sonodynamic therapy(SDT).With this bearing...The separation of electron-hole pairs while inhibiting their recombination under ultrasound irradiation is vital phenomena to the generation of reactive oxygen species(ROS)in sonodynamic therapy(SDT).With this bearing in mind,we have designed and synthesized nano heterostructure of FeMoO_(y)and MoS_(x)(FeMoO_(y)@MoS_(x),FMOS),featuring a MoS_(x)nanoflower core,via a two-step hydrothermal process.This structure is subsequently enveloped with cell membrane to form FMOS@cell membrane(FMOS@CM)nano-sonosensitizer.The growth of FeMoO_(y)on MoS_(x)effectively narrows the bandgap of MoS_(x)and facilitates the separation of ultrasound-activated electrons and holes,which significantly enhances SDT performance under ultrasonic irradiation.Additionally,the material harnesses ultrasonic energy to activate surface electrons,converting Fe^(3+)to Fe^(2+).This conversion increases charge utilization efficiency,promotes the activity of Fenton reaction,and optimizes the chemodynamic therapy(CDT)performance of the material.Moreover,the encapsulation within the cell membrane guarantees the tumor-targeting capability and biocompatibility of FMOS@CM,thereby facilitating a more effective and safer tumor treatment strategy.In conclusion,this study presents a novel methodology for synthesizing sonosensitizers by in situ growth-induced assembly of metal ions.This approach provides innovative insights for the development of a new,precise,high-efficiency,multimodal synergistic treatment platform mediated by ultrasound.展开更多
(Bi,Sb)_(2)(Te,Se)_(3) alloys are widely used commercial thermoelectric(TE)materials for solid-state refrigeration around room temperature.The composition-induced structural phase transition could be realized by varyi...(Bi,Sb)_(2)(Te,Se)_(3) alloys are widely used commercial thermoelectric(TE)materials for solid-state refrigeration around room temperature.The composition-induced structural phase transition could be realized by varying the compositions in these alloys,which may largely alter the electronic structure and phonon dispersion.Among them,the Se-alloyed Sb_(2)Te_(3) accompanied with structural transition is seldom reported.Herein,the interrelations of Se-alloying induced changes in structural phase transition,band structure and TE properties of p-type zone-melted Sb_(2)Te_(3-x)Se_(x)(x=1.5-2.4)alloys near phase transition boundary are systematically investigated.The results demonstrate that Sb_(2)Te_(3-x)Se_(x) shows a structural transition from a rhombohedral phase to mixed structure at x=2.0.The carrier concentration and bandgap at room temperature of Sb_(2)Te_(3)-xSex(x=1.5-2.4)constantly decrease with increasing Se contents x.The zT peak of the Sb_(2)TeSe_(2) matrix is improved and shifted to higher temperature by optimizing carrier concentration via Ag doping.A maximum zT of~0.4 is obtained at 680 K in Sb_(1.97)Ag_(0.03)TeSe_(2) alloy,about 100% enhancement compared with the undoped sample.展开更多
Piezoelectric materials that can effectively convert natural mechanical energy into electrical energy without time and space constraints have been widely applied for energy harvesting and conversion.The piezocomposite...Piezoelectric materials that can effectively convert natural mechanical energy into electrical energy without time and space constraints have been widely applied for energy harvesting and conversion.The piezocomposites with high piezoelectricity and flexibility have shown great promise for renewable electric energy generation that can power implantable and wearable electronics.This minireview aims to summarize the recent progress of the piezocomposites with different composite structures,as well as the role of the theoretical understandings and designs in the development of new piezoelectric nanogenerator materials.Thereinto,the most common composite structural types(0-3,1-3,and 3-3)have been discussed systematically.Several strategies for high output performance of piezocomposites are also proposed on the basis of current experimental and simulation results.Finally,the review concludes with perspectives on the future design of flexible piezoelectric nanocomposites for energy harvesters.展开更多
基金funded by State Grid Beijing Electric Power Company Technology Project,grant number 520210230004.
文摘The park-level integrated energy system(PIES)is essential for achieving carbon neutrality by managing multi-energy supply and demand while enhancing renewable energy integration.However,current carbon trading mechanisms lack sufficient incentives for emission reductions,and traditional optimization algorithms often face challenges with convergence and local optima in complex PIES scheduling.To address these issues,this paper introduces a low-carbon dispatch strategy that combines a reward-penalty tiered carbon trading model with P2G-CCS integration,hydrogen utilization,and the Secretary Bird Optimization Algorithm(SBOA).Key innovations include:(1)A dynamic reward-penalty carbon trading mechanism with coefficients(μ=0.2,λ=0.15),which reduces carbon trading costs by 47.2%(from$694.06 to$366.32)compared to traditional tiered models,incentivizing voluntary emission reductions.(2)The integration of P2G-CCS coupling,which lowers natural gas consumption by 41.9%(from$4117.20 to$2389.23)and enhances CO_(2) recycling efficiency,addressing the limitations of standalone P2G or CCS technologies.(3)TheSBOA algorithm,which outperforms traditionalmethods(e.g.,PSO,GWO)in convergence speed and global search capability,avoiding local optima and achieving 24.39%faster convergence on CEC2005 benchmark functions.(4)A four-energy PIES framework incorporating electricity,heat,gas,and hydrogen,where hydrogen fuel cells and CHP systems improve demand response flexibility,reducing gas-related emissions by 42.1%and generating$13.14 in demand response revenue.Case studies across five scenarios demonstrate the strategy’s effectiveness:total operational costs decrease by 14.7%(from$7354.64 to$6272.59),carbon emissions drop by 49.9%(from 5294.94 to 2653.39kg),andrenewable energyutilizationincreases by24.39%(from4.82%to8.17%).These results affirmthemodel’s ability to reconcile economic and environmental goals,providing a scalable approach for low-carbon transitions in industrial parks.
基金funded by the Key Research Project of Zhejiang(LD22E030007)the“Leading Goose”R&D Program of Zhejiang Province(No.2022C01136)+2 种基金National Science Foundation of China(NSFC No.61974037,No.61904042,No.62274049)Zhejiang University Education Foundation Global Partnership Fund(No.100000-11320)the support of the Micro-nano Fabrication Center of International campus of Zhejiang University.
文摘Few-layer nanosheets(NSs)of hexagonal boron nitride(h-BN)and molybdenum disulfide(MoS_(2))display notable piezoelectric properties.Yet,their integration into polymers typically yields non-piezoelectric composites due to NSs’random distribution.We introduce a facile method for fabricating intrinsic piezoelectric composites incorporated with NSs without electric poling.Our innovative process aligns NSs within polyvinyl alcohol polymer,leveraging ice-water interfacial tension,water crystallization thrust,and directional cross-linking during freezing.The resulting PE composites exhibit a maximum piezoelectric coefficient of up to 25.5-28.4 pC N^(-1),comparable to polyvinylidene difluoride(PVDF),with significant costefficiency,safety,and scalability advantages over conventional materials.Using this composite,we develop highly sensitive wearable pressure and strain sensors,and an ultrasound energy harvester.These sensors detect finger bending and differentiate between walking and running,while the harvester generates1.18 V/2.31μA under 1Wcm^(-2)ultrasound input underwater.This universal method offers a novel manufacturing technique for piezoelectric composites,demonstrating remarkable effectiveness in synthesizing intrinsic piezoelectric composites based on 2D materials.Moreover,its potential extends to applications in wearable electronics and energy harvesting,promising significant advancements in these fields.
基金supported by the National Key R&D Program of China(2023YFB2504000,YH)a start-up grant from Zhejiang University and the Fundamental Research Funds for the Central Universities(2021FZZX001,226-2024-00005)supported by Special Support Plan for High Level Talents in Zhejiang Province(2023R5231)。
文摘Metal alloy anode materials with high specific capacity and low voltage have recently gained significant attention due to their excellent electrochemical performance and the ability to suppress dendrite growth.However,experimental investigations of metal alloys can be time-consuming and expensive,often requiring extensive experimental design and effort.In this study,we developed a machine learning model based on the Crystal Graph Convolutional Neural Network(CGCNN)to screen alloy anode materials for seven battery systems,including lithium(Li),sodium(Na),potassium(K),zinc(Zn),magnesium(Mg),calcium(Ca),and aluminum(Al).We utilized data with tens of thousands of alloy materials from the Materials Project(MP)and Automatic FLOW for Materials Discovery(AFLOW)databases.Without any experimental voltage input,we identified over 30 alloy systems that have been experimentally validated with good precision.Additionally,we predicted over 100 alloy anodes with low potential and high specific capacity.We hope this work to spur further interest in employing advanced machine learning models for the design of battery materials.
基金Supported by General Program of Natural Science Foundation of Jiangxi Province(20232BAB206169)Science and Technology Program of Jiangxi Administration of Traditional Chinese Medicine(2024B0037)+2 种基金Science and Technology Plan of Jiangxi Provincial Health Commission(202211411)Open Fund of Key Laboratory of Modern Preparation of TCM,Ministry of Education,Jiangxi University of Traditional Chinese Medicine(TCM-201909)National College Students Innovation and Entrepreneurship Training Program(202110412041,202410410212,202510412017).
文摘[Objectives]To apply the novel induction heating(IH)technology for the extraction of Ophiopogon japonicus polysaccharide(OJPS),fully utilize the advantages of IH technology to improve the extraction yield of OJPS,and compare it with traditional Chinese medicine polysaccharide extraction methods.[Methods]Using the polysaccharide extraction yield as the evaluation index,the IH extraction process for OJPS was optimized through an L_(9)(3^(4))orthogonal test,and systematic methodological validation was conducted.Finally,the process parameters and procedure for extracting OJPS using IH technology were optimized.[Results]The optimal extraction process was as follows:solid-liquid ratio of 1:55,extraction time of 75 min,and alcohol precipitation ratio of 1:4.The methodological investigation showed that OJPS had a good linear relationship in the range of 20-140μg/mL,with R^(2)=0.9993.The average recovery rate was 99.94%(RSD=1.32%).The RSD s for precision,repeatability,and stability were all less than 2%,indicating that the measurement method for OJPS extraction yield was excellent.The extraction yields of OJPS by reflux extraction,ultrasonic extraction,and IH extraction were 26.67%,40.70%,and 51.74%,respectively.[Conclusions]The novel IH extraction technology is stable and reliable,has a significant impact on the extraction yield of OJPS,and also improves the conversion rate of OJPS.It is expected to become an emerging technology and research direction for the extraction of Chinese medicine polysaccharides.
基金the financial support from the National Natural Science Foundation of China (22078058)Open Research Fund Program of CAS Key Laboratory of Energy Regulation Materials (ORFP2020–02)
文摘We investigated the solid–liquid suspension characteristics in the tank with a liquid height/tank diameter ratio of 1.5 stirred by a novel long-short blades(LSB) impeller by the Euler granular flow model coupled with the standard k–ε turbulence model. After validation of the local solid holdup by experiments,numerical predictions have been successfully used to explain the influences of impeller rotating speed,particle density, particle size, liquid viscosity and initial solid loading on the solid suspension behavior,i.e. smaller particles with lower density are more likely to be suspended evenly in the liquid with higher liquid viscosity. At a low impeller rotating speed(N), increase in N leads to an obvious improvement in the solid distribution homogeneity. Moreover, the proposed LSB impeller has obvious advantages in the uniform distribution of the solid particles compared with single Rushton turbine(RT), dual RT impellers or CBY hydrofoil impeller under the same power consumption.
基金supported by the National Natural Science Foundation of China(Nos.81402721,81573203,21605131)Science and Technology Department of Henan Province(No.22170004)
文摘DNA methyltransferase 1(DNMT1)is a useful biomarker for lung cancer in early clinical diagnosis.A rapid magnetic chemiluminescence immunoassay(MCLIA)for DNMT1 in human serum has been developed.Horseradish peroxidase(HRP)-second-Ab was used to labeled polyclonal antibodies of anti-DNMT1.DNMT1 in sample integrates with specific immunomagnetic beads and can constitute a supersandwiched immunoreaction.In magnetic field,nonspecific materials can be separated.After luminescent substrate luminol-H2O2-BIP was added,the relative light unit(RLU)of HRP was detected and was discovered to be directly proportional to the content of DNMT1 in sample.The correlative variables involved in the MCLIA value were optimized and the methodological evaluation was carried out.After optimization,in the range of0.5–128 ng/mL,the linear regression equation was y=0.5014 x+1.769(x was logCDNMT1,y was relative luminescence units(RLU)/RLU0),and the limit of detection was 0.01 ng/mL.The RSD of intra-and interassays were 15.8%–16.9%and 14.3%–18.1%,respectively.The recovery was from 70.0%to 106.2%.Furthermore,paralleled with purchasable enzyme-linked immunosorbent assay(ELISA)kits,MCLEIA had lower detection limit,wider linear range and shorter detection time.Therefore,the MCLEIA established in this study could be used for the sensitive detection of DNMT1 in serum sample.
基金the Foundation of ECUST(East China University of Science and Technology)for Outstanding Young Teachers(YH0157105)
文摘The first-passage statistics of Duffing-Rayleigh- Mathieu system under wide-band colored noise excitations is studied by using stochastic averaging method. The motion equation of the original system is transformed into two time homogeneous diffusion Markovian processes of amplitude and phase after stochastic averaging. The diffusion process method for first-passage problem is used and the corresponding backward Kolmogorov equation and Pontryagin equation are constructed and solved to yield the conditional reliability function and mean first-passage time with suitable initial and boundary conditions. The analytical results are confirmed by Monte Carlo simulation.
基金financial support from the National Natural Science Foundation of China (22078058)。
文摘This work focuses on the design improvement of the long-short blades(LSB)impeller by using pitched short blades(SBs)to regulate the flow field in the stirred vessel.After mesh size evaluation and velocity field validation by the particle image velocimetry,large eddy simulation method coupled with sliding mesh approach was used to study the effect of the pitched SBs on the flow characteristics.We changed the inclined angles of the SBs from 30°to 60°and compared the flow characteristics when the impeller was operated in the down-pumping and up-pumping modes.In the case of down-pumping mode,the power number is relatively smaller and vortexes below the SBs are suppressed,leading to turbulence intensification in the bottom of the vessel.Whereas in the case of up-pumping mode,the axial flow rate in the center increased significantly with bigger power number,resulting in more efficient mass exchange between the axial and radial flows in the whole vessel.The LSB with 45°inclined angle of the SBs in the up-pumping mode has the most uniform distributions of flow field and turbulent kinetic energy compared with other impeller configurations.
基金supported by the Natural Science Foundation of China(Nos.21871293 and 22071264)。
文摘A palladium-catalyzed cascade cyclization of allenylethylene carbonates with 1,3-indandiones was developed, providing biologically interesting tetracyclic dihydrocyclopentaindenofuranone derivatives having three contiguous quaternary carbon centers in moderate to high yields with excellent diastereoselectivities. In this reaction, the allene moiety was fully fused into the cyclopentene ring.
基金support from the National Outstanding Youth Foundation of China(52125104)the National Natural Science Foundation of China(52071285 and 51831009)+1 种基金the Fundamental Research Funds for the Central Universities(2021FZZX001-09)the National Youth Top-Notch Talent Support Program.Z.H.acknowledges support under the Australian Research Council's Future Fellowship(FT190100658).
文摘The development of high-performance binders is a simple but effective approach to address the rapid capacity decay of high-capacity anodes caused by large volume change upon lithiation/delithiation.Herein,we demonstrate a unique organic/inorganic hybrid binder system that enables an efficient in situ crosslinking of aqueous binders(e.g.,sodium alginate(SA)and carboxymethyl cellulose(CMC))by reacting with an inorganic crosslinker(sodium metaborate hydrate(SMH))upon vacuum drying.The resultant 3D interconnected networks endow the binders with strong adhesion and outstanding self-healing capability,which effectively improve the electrode integrity by preventing fracturing and exfoliation during cycling and facilitate Li^(+)ion transfer.SiO anodes fabricated from the commercial microsized powders with the SA/0.2SMH binder maintain 1470 mAh g^(-1)of specific capacity at 100 mA g^(-1)after 200 cycles,which is 5 times higher than that fabricated with SA binder alone(293 mAh g^(-1)).Nearly,no capacity loss was observed over 500 cycles when limiting discharge capacity at 1500 mAh g^(-1).The new binders also dramatically improved the performance of Fe_(2)O_(3),Fe_(3)O_(4),NiO,and Si electrodes,indicating the excellent applicability.This finding represents a novel strategy in developing high-performance aqueous binders and improves the prospect of using high-capacity anode materials in Li-ion batteries.
基金supported by the National Key R&D Program (2022YFB2502000)the Zhejiang Provincial Natural Science Foundation of China (LZ23B030003)the Fundamental Research Funds for the Central Universities (2021FZZX001-08,2021FZZX001-09)。
文摘Aqueous zinc-ion batteries(ZIBs) are considered promising power sources for grid storage,but they face several issues,including dendrite growth,corrosion,hydrogen evolution,etc.,which are related to the Zn metal/liquid electrolyte interface.To address these challenges,many researchers have focused on modifying the Zn anode with surface adsorption.However,the underlying mechanism between the Zn surface and adsorbed/protective molecules has not been thoroughly explored.In this study,we built a multiscale simulation platform that integrates state-of-art simulation methods to comprehensively investigate the adsorption process of amino acids on the Zn metal surface.Our major finding is that adsorption sites,adsorbate–surface angle,and average distance are critical parameters for the stability and strength of surface adsorption.Additionally,ab initio molecular dynamics reveal the kinetics of the surface adsorption and molecule reorientation processes.Specifically,it can be discovered that the amino acids prefer to align parallel to the Zn metal surface,leading to better surface protection against corrosion and preventing dendrite growth.These findings pave the way for an in-depth understanding of the surface adsorption process,as well as providing concrete design principles for stable Zn metal anodes.
文摘This paper focuses on the general case （GC） airborne bistatic synthetic aperture radar （SAR） data processing, and a new analytical imaging algorithm based on the extended Loffeld＇s bistatic formula （ELBF） is proposed. According to the bistatic SAR geometry, the track decoupling formulas that convert the bistatic geometry to the receiver-referenced geometry in a concise way are derived firstly. Then phase terms of ELBF are decomposed into two independent phase terms as the range phase term and the azimuth phase term in a new way. To get the focusing result, the bistatic deformation （BD） term is compensated in the two-dimensional （2- D） frequency domain, and the space-variances of the range phase term and the azimuth phase term are eliminated by chirp scaling （CS） and chirp z-transform （CZT）, respectively. The effectiveness of the proposed algorithm is verified by the simulation results.
基金supported by the National Natural Science Foundation of China(Grant No.NSFC-52172079).
文摘In this work,a supersonic turbulent boundary layer with freestream Mach number 2.25 and Reynolds number based on the momentum thickness around 4000 is obtained by a direct numerical simulation.The wall-pressure fluctuations are split into positive and negative families by the conditional correlation and clustering method.The negative wall-pressure fluctuation has smaller integral length scales than the positive one.But they have comparable integral time scales.Positive wall-pressure fluctuation is convected slightly faster than the negative one.Statistically,wall-pressure clusters are self-similarly packed on the wall,i.e.,the absolute distance between two wall-pressure clusters is proportional to their sizes.Closest pairs of wall-pressure clusters of the same sign are largely spanwise aligned.While wall-pressure clusters of the opposite signs are streamwise paired.Wall-pressure fluctuations are non-locally associated with wall shear stresses.The streamwise wall shear stress is largely downstream of the wall-pressure fluctuations.While the spanwise wall shear stress and wall-pressure are diagonally aligned in two opposite directions,their cross-correlation is a quadrupole with the two correlation lobes upstream of wall-pressure fluctuations being dominant.
基金funded by the“Leading Goose”R&D Program of Zhejiang Province(No.2022C01136)the Key Research Project of Zhejiang(LD22E030007)Zhejiang University Education Foundation Global Partnership Fund(No.100000-11320).
文摘Organic piezoelectric materials have attracted significant interest for applications in sensing,energy harvesting,and flexible electronics.However,its piezoelectric properties are yet to be improved.This study introduces a facile strategy to fabricate homogenous and dense polyvinylidene fluoride(PVDF)films with high piezoelectric performance via anhydrous CaCl_(2)doping.The strong ion-dipole interaction between Ca^(2+)and F atoms,along with directional dipole alignment under an electric field at elevated temperature,as verified by molecular dynamics simulations and material characterizations.This results in an impressiveβ-phase content of 92.78%and a piezoelectric coefficient of 29.26 pm/V.A piezoelectric device fabricated from this PVDF film delivers an output voltage exceeding 12 V under external pressure and maintains stability over 60,000 cycles.When integrated with an LC resonant circuit,it functions as a wireless sensor for real-time motion monitoring.This scalable approach significantly advances piezoelectric polymer performance for practical applications.
基金supported by the Zhejiang Provincial Natural Science Foundation(No.LD22E030005,LY22E020005)the“Leading Goose”R&D Program of Zhejiang Province(No.2022C01136)+2 种基金the Joint Funds of the National Science Foundation of China(No.U20A20172)the Fundamental Research Funds for the Central Universities(Grant No.226-2024-00120,226-2024-00188)the Open Research Project of Innovation Center of Yangtze River Delta of Zhejiang University.
文摘Traditional ferroelectric materials,such as lead zirconate titanate(PZT)ceramics,exhibit positive strain when subjected to an electric field along the polarization direction.In contrast,the piezoelectric polymer polyvinylidene fluoride(PVDF)and its copolymer P(VDF-TrFE)display unique negative strain properties.While extensive research has focused on understanding the origin and mechanisms of this negative strain,limited efforts have been directed toward regulating these properties.This study optimizes the electro-strain and ferroelectric properties of P(VDF-TrFE)piezoelectric films through the synergistic effect of PbTiO_(3)nanosheets and an in-situ electrostatic field.Our results demonstrate that while the incorporation of PbTiO_(3)nanosheets does not notably enhance ferroelectricity,it significantly improves electro-strain properties,particularly negative strain,which increases from-0.097%to-0.185%,an enhancement of 91%.Moreover,the ferroelectric polarization and positive strain of P(VDF-TrFE)are further enhanced under the combined influence of PbTiO_(3)nanosheets and in-situ electrostatic field,increasing maximum polarization from 10.79μmC/cm^(2)to 13.16μmC/cm^(2),a 22%improvement,and positive strain from 0.213%to 0.267%,a 25%enhancement.We propose a possible mechanism for these improvements,attributed to the enhanced flexibility of the amorphous phase and increased content of polar b-phase in P(VDF-TrFE)films under this synergistic effect.This work highlights novel strategies for controlling the electro-strain and ferroelectric properties of P(VDF-TrFE)piezoelectric films.
基金supported by Beijing Life Science Academy(BLSA)(No.2023400CA0100)the National Natural Science Foundation of China(No.52172289)Fundamental Research Funds for the Central Universities and the Funds of the Natural Science Foundation of Hangzhou(No.2024SZRYBH180004).
文摘The separation of electron-hole pairs while inhibiting their recombination under ultrasound irradiation is vital phenomena to the generation of reactive oxygen species(ROS)in sonodynamic therapy(SDT).With this bearing in mind,we have designed and synthesized nano heterostructure of FeMoO_(y)and MoS_(x)(FeMoO_(y)@MoS_(x),FMOS),featuring a MoS_(x)nanoflower core,via a two-step hydrothermal process.This structure is subsequently enveloped with cell membrane to form FMOS@cell membrane(FMOS@CM)nano-sonosensitizer.The growth of FeMoO_(y)on MoS_(x)effectively narrows the bandgap of MoS_(x)and facilitates the separation of ultrasound-activated electrons and holes,which significantly enhances SDT performance under ultrasonic irradiation.Additionally,the material harnesses ultrasonic energy to activate surface electrons,converting Fe^(3+)to Fe^(2+).This conversion increases charge utilization efficiency,promotes the activity of Fenton reaction,and optimizes the chemodynamic therapy(CDT)performance of the material.Moreover,the encapsulation within the cell membrane guarantees the tumor-targeting capability and biocompatibility of FMOS@CM,thereby facilitating a more effective and safer tumor treatment strategy.In conclusion,this study presents a novel methodology for synthesizing sonosensitizers by in situ growth-induced assembly of metal ions.This approach provides innovative insights for the development of a new,precise,high-efficiency,multimodal synergistic treatment platform mediated by ultrasound.
基金financially supported by the National Science Foundation of China(No.51871199,51861145305,51572237,61534001)the Zhejiang Provincial Natural Science Foundation(No.LZ17E020003)+1 种基金the Fundamental Research Funds for the Central Universities(No.2017XZZX001-04,2017QNA4011)the 111 Project(No.B16042).
文摘(Bi,Sb)_(2)(Te,Se)_(3) alloys are widely used commercial thermoelectric(TE)materials for solid-state refrigeration around room temperature.The composition-induced structural phase transition could be realized by varying the compositions in these alloys,which may largely alter the electronic structure and phonon dispersion.Among them,the Se-alloyed Sb_(2)Te_(3) accompanied with structural transition is seldom reported.Herein,the interrelations of Se-alloying induced changes in structural phase transition,band structure and TE properties of p-type zone-melted Sb_(2)Te_(3-x)Se_(x)(x=1.5-2.4)alloys near phase transition boundary are systematically investigated.The results demonstrate that Sb_(2)Te_(3-x)Se_(x) shows a structural transition from a rhombohedral phase to mixed structure at x=2.0.The carrier concentration and bandgap at room temperature of Sb_(2)Te_(3)-xSex(x=1.5-2.4)constantly decrease with increasing Se contents x.The zT peak of the Sb_(2)TeSe_(2) matrix is improved and shifted to higher temperature by optimizing carrier concentration via Ag doping.A maximum zT of~0.4 is obtained at 680 K in Sb_(1.97)Ag_(0.03)TeSe_(2) alloy,about 100% enhancement compared with the undoped sample.
基金Zhejiang Provincial Natural Science Foundation(no.LD22E030005)Fundamental Research Funds for the Central Universities(no.2021FZZX001-08 to Z.H.and no.226-2022-00123 to Y.H.)+1 种基金NSFC-Zhejiang Joint Fund for the Integration of Industrialization and information(no.U1909212 to Y.W.)The“Leading Goose”R&D Program of Zhejiang Province(no.2022C01136 to Z.H.and Y.H.).
文摘Piezoelectric materials that can effectively convert natural mechanical energy into electrical energy without time and space constraints have been widely applied for energy harvesting and conversion.The piezocomposites with high piezoelectricity and flexibility have shown great promise for renewable electric energy generation that can power implantable and wearable electronics.This minireview aims to summarize the recent progress of the piezocomposites with different composite structures,as well as the role of the theoretical understandings and designs in the development of new piezoelectric nanogenerator materials.Thereinto,the most common composite structural types(0-3,1-3,and 3-3)have been discussed systematically.Several strategies for high output performance of piezocomposites are also proposed on the basis of current experimental and simulation results.Finally,the review concludes with perspectives on the future design of flexible piezoelectric nanocomposites for energy harvesters.
