Electrified transportation requires batteries with high energy density and high-rate capability for both charging and ***-ion batteries(LiBs)face a dilemma:increasing areal capacity and reducing electrode porosity to ...
详细信息
Electrified transportation requires batteries with high energy density and high-rate capability for both charging and ***-ion batteries(LiBs)face a dilemma:increasing areal capacity and reducing electrode porosity to boost energy density often reduces rate capability due to a longer and more tortuous ion transfer *** cell design parameters to balance these metrics is essential but ***,we present a multi-objective optimization framework targeting energy density,fast charging,high-rate discharging,and lifespan *** cell parameters-cathode areal capacity,N-P ratio,cathode porosity,and anode poros-ity-along with operating temperature,are selected as design variables.A physics-based pseudo-2D model,validated against experimental data,generates data to train the surrogate model,which is combined with the NSGA-Ⅱalgorithm for rapid *** different objective calculation methods are compared to identify the maximum sum of energy densities,lowest polarization,and most balanced performance,*** design parameters are optimized at different temperatures using the most balanced optimization *** demonstrate that elevating cell operating temperature achieves high-rate capability while maintaining high energy density,mitigating the energy-power trade-off and broadening battery design parameter ranges.
The impact of information dissemination on epidemic control is essentially subject to individual behaviors. Vaccination is one of the most effective strategies against the epidemic spread, whose correlation with the i...
详细信息
The impact of information dissemination on epidemic control is essentially subject to individual behaviors. Vaccination is one of the most effective strategies against the epidemic spread, whose correlation with the information dissemination should be better understood. To this end, we propose an evolutionary vaccination game model in multiplex networks by integrating an information-epidemic spreading process into the vaccination dynamics, and explore how information dissemination influences vaccination. The spreading process is described by a two-layer coupled susceptible-alert-infected-susceptible(SAIS) model, where the strength coefficient between two layers characterizes the tendency and intensity of information *** find that the impact of information dissemination on vaccination decision-making depends on not only the vaccination cost and network topology, but also the stage of the system evolution. For instance, in a two-layer BA scale-free network, information dissemination helps to improve vaccination density only at the early stage of the system evolution, as well as when the vaccination cost is smaller. A counter-intuitive conclusion that more information transmission cannot promote vaccination is obtained when the vaccination cost is larger. Moreover, we study the impact of the strength coefficient and individual sensitivity on the fraction of infected individuals and social cost, and unveil the role of information dissemination in controlling the epidemic.
Terrain classification information is of great significance for legged robots to traverse various ***,this communication presents an online terrain classification framework for legged robots,utilizing the acoustic sig...
详细信息
Terrain classification information is of great significance for legged robots to traverse various ***,this communication presents an online terrain classification framework for legged robots,utilizing the acoustic signals produced during *** Mel-Frequency Cepstral Coefficient(MFCC)feature vectors are extracted from the acoustic data recorded by an on-board *** the Gaussian mixture models(GMMs)are used to classify the MFCC features into different terrain type *** proposed framework was validated on a quadruped ***,our investigations achieved a classification time-resolution of 1 s when the robot trotted over three kinds of terrains,thus recording a comprehensive success rate of 92.7%.
This work presents simple post-treatment methods to selectively and partially remove the Pd core of Pd-Pt core–shell(Pt@Pd/C)*** proton exchange membrane fuel cell with the post-treated Pt@Pd/C cathode(Pt loading:0.1...
详细信息
This work presents simple post-treatment methods to selectively and partially remove the Pd core of Pd-Pt core–shell(Pt@Pd/C)*** proton exchange membrane fuel cell with the post-treated Pt@Pd/C cathode(Pt loading:0.10 mg·cm^(-2))delivers an impressive peak power density of 1.2 W·cm^(-2).The partial removal of Pd core endows an ultrahigh oxygen reduction reaction(ORR)mass activity of 0.32 A·g_(PGM)-1 when normalized to the platinum group metal(PGM)mass,or equivalently 0.55 A·mg_(Pt)^(-1) at 0.9 V measured in a fuel *** post-treatment thickens the Pt shells and mitigates the Pd dissolution during potential *** a result,the post-treated core-shell catalyst demonstrates superior durability in ORR mass activity and polarization power density retention than untreated core-shell catalyst and benchmark Pt/***-situ inductively coupled plasmamass spectrometry(ICP-MS)results highlight that the amount of dissolved Pd in post-treated core–shell catalyst is 17-times lower than that of the untreated *** findings highlight the importance of structural tuning of catalysts in enhancing their mass activity and durability.
The design of van der Waals heterojunctions with S-scheme charge transfer pathway is expected to be an effective strategy for improvement of photocatalytic ***,two-dimensional(2D)phosphorus-doped g-C_(3)N_(4)/Bi_(5)O_...
详细信息
The design of van der Waals heterojunctions with S-scheme charge transfer pathway is expected to be an effective strategy for improvement of photocatalytic ***,two-dimensional(2D)phosphorus-doped g-C_(3)N_(4)/Bi_(5)O_(7)Ivan der Waals heterojunctions with reduced graphene oxide as electron bridge(PCN/RGO/Bi_(5O)_(7)I)were successfully synthesized via hydrothermal *** van der Waals interaction endowed 2D PCN/RGO/Bi_(5O)_(7)I with intimate contact interface,lattice match,tunable band structure,and internal electric field,which efficiently promoted interfacial charge separation and enhanced redox ability of photogenerated charge *** a result,the S-scheme PCN/RGO/Bi_5O_7I van der Waals heterojunctions exhibited superior photocatalytic performance in ciprofloxacin degradation and real pharmaceutical wastewater *** optimized 12%PCN/RGO/Bi_5O_7I displayed the highest photocatalytic activity with 92%removal of ***,the COD removal efficiency and extent of mineralization of real pharmaceutical wastewater reached 66.9%and 59.8%,respectively,and the biodegradability of pharmaceutical wastewater was significantly *** photocatalytic mechanism of the S-scheme PCN/RGO/Bi_(5)O_(7)I van der Waals heterojunctions based on the analysis of reactive species,work function,and internal electric field was *** study provides fresh insights into plausible design of S-scheme van der Waals heterojunction to enhance photocatalytic redox ability.
Epigenetic regulation in the rumen,a unique ruminant organ,remains largely unexplored compared with other tissues studied in model *** this study,we perform an in-depth analysis of the epigenetic and transcriptional l...
详细信息
Epigenetic regulation in the rumen,a unique ruminant organ,remains largely unexplored compared with other tissues studied in model *** this study,we perform an in-depth analysis of the epigenetic and transcriptional landscapes across fetal and adult bovine tissues as well as pluripotent stem *** the extensive methylation differences across various stages and tissues,we identify tissue-specific differentially methylated regions(tsDMRs)unique to the rumen,which are crucial for regulating epithelial development and energy *** tsDMRs cluster within super-enhancer regions that overlap with transcription factor(TF)binding *** models indicate that DNA methylation,along with H3K27me3 and H3K27ac,can be used to predict enhancer *** upstream TFs,including SOX2,FOSL1/2,and SMAD2/3,primarily maintain an inhibitory state through bivalent modifications during fetal *** functional genes are maintained mainly in a stable repressive state via DNA methylation until differentiation is *** study underscores the critical role of tsDMRs in regulating distal components of rumen morphology and function,providing key insights into the epigenetic regulatory mechanisms that may influence bovine production traits.
Electromagnetic absorbing materials may convert electromagnetic energy into heat energy and dissipate ***,in a high-power electromagnetic radiation environment,the temperature of the absorbing material rises significa...
详细信息
Electromagnetic absorbing materials may convert electromagnetic energy into heat energy and dissipate ***,in a high-power electromagnetic radiation environment,the temperature of the absorbing material rises significantly and even *** becomes critical to ensure electromagnetic absorption performance while minimizing temperature ***,we systematically study the coupling mechanism between the electromagnetic field and the temperature field when the absorbing material is irradiated by electromagnetic *** find out the influence of the constitutive parameters of the absorbing materials(including uniform and non-uniform)on the temperature ***,through a smart design,we achieve better absorption and lower temperature *** accuracy of the model is affirmed as simulation results aligned with theoretical *** work provides a new avenue to control the temperature distribution of absorbing materials.
In this paper,we consider the positive definiteness of fourth-order partially symmetric ***,two analytically sufficient and necessary conditions of positive definiteness are provided for fourth-order two dimensional p...
详细信息
In this paper,we consider the positive definiteness of fourth-order partially symmetric ***,two analytically sufficient and necessary conditions of positive definiteness are provided for fourth-order two dimensional partially symmetric ***,we obtain several sufficient conditions for rank-one positive definiteness of fourth-order three dimensional partially symmetric tensors.
Heavy metal(loid)s contamination is a constant issue at smelting *** is essential to investigate the spatial distribution and migration characteristics of heavy metal(loid)s in the soil for environmental management an...
详细信息
Heavy metal(loid)s contamination is a constant issue at smelting *** is essential to investigate the spatial distribution and migration characteristics of heavy metal(loid)s in the soil for environmental management and remediation strategies of non-ferrous smelting *** this study,203 soil samples from 57 sites were collected in a typical lead smelting *** findings demonstrated that there were significant Pb,Zn,Cd,and As contamination in soil *** spatial distribution of heavy metal(loid)s showed strong spatial heterogeneity,the contaminated soil areas of Pb,As,Cd,and Zn were 99.5%,98.9%,85.3%,and 72.4%,***,Cd,and As contamination of the soil reached a depth of 5 m,which migrated from the surface to deep soil *** leaching contents of Zn,Pb,and As decreased obviously in 3-4 m soil layer,but the leaching content of Cd was still high,which indicated the high migration of *** the increase of depth,the proportion of acid soluble fraction of heavy metal(loid)s decreased,and the residual fraction *** acid soluble fraction of Cd accounted for a higher proportion,and As mainly existed in reducible and residual fractions in *** to the calculation of the migration factor,the migration of heavy metal(loid)s in soils were ordered as Cd>Zn>Pb>*** outcomes are advantageous for risk reduction and site remediation for non-ferrous metal smelting sites.
An analysis of the features of the 6-year planning period including new ambitious goals set by the President of the Russian Federation showed that there are possible scenarios in which these goals may be unachievable ...
详细信息
暂无评论