Sluggish conversion reaction kinetics and spontaneous shuttle effect of lithium polysulfides(LiPSs)are deemed as the two big mountains that hinder the practical application of lithium-sulfur batteries(LSBs).Herein,dua...
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Sluggish conversion reaction kinetics and spontaneous shuttle effect of lithium polysulfides(LiPSs)are deemed as the two big mountains that hinder the practical application of lithium-sulfur batteries(LSBs).Herein,dual-defect engineering strategy is implemented by introducing boron-doping and phosphorusvacancy sites with MoP@NC composite as the *** on the experimental characterizations and theoretical calculations,B-MoP_(1-x)@NC-based electrode presents low oxidation potential,high lithium diffusivity,small Tafel slope and strong adsorption capability for polysulfides,which is beneficial to enhance the adsorption capability for LiPSs,reduce the lithium diffusion energy barriers and Gibbs free energy for the conversion reactions of *** demonstrated,the corresponding Li-S/B-MoP1-x@NC batteries can remain high reversible capacity of 753 mAh/g at 0.5 C after 300 cycles,and keep a stable capacity of 520 mAh/g at 0.5 C after 100 cycles even at the high-loading content of 5.1mg/cm^(2).According to the results of in-situ UV–vis spectra,the satisfactory battery performance majorly originates from the existence of dual-defect characteristics in B-MoP1-x@NC catalyst,which effectively promotes the conversion reaction kinetics of LiPSs,and restrains the shuttle behavior of *** key ideas of this work will enlighten the development of catalytic cathode materials for sulfur-based secondary batteries.
Pork is the primary red meat consumed globally. Given the rise in global pork trade, to explore the robustness of the nternational pork trade networks (IPTN) to trade shocks is necessary. In this paper, we construct n...
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We proposed a new measure to optimize the comprehensive magnetic properties of SmCo5 *** compounding Fe-15Ni-3Al-1Ti(FNAT)alloy with high saturation magnetization and Sm(Co,Cu)5 matrix alloy in the liquid state,an inn...
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We proposed a new measure to optimize the comprehensive magnetic properties of SmCo5 *** compounding Fe-15Ni-3Al-1Ti(FNAT)alloy with high saturation magnetization and Sm(Co,Cu)5 matrix alloy in the liquid state,an innovative two-phase separation microstructure or cellular microstructure is formed after melt-spinning using the phase separation effect of the two *** the same time,the element concentration,relative phase content,and microstructure are adjusted by adding different con-tents of FNAT *** results show that FNAT addition promotes the as-spun ribbons phase separation(or spinodal decomposition)into Co-rich SmCo5-and Sm-Ni-rich CeCo5-or Sm2Co7-type *** 3 wt.％FNAT increases the coercivity,saturation magnetization,and remanence of the ribbons by 320.6％,39.8％,and 82.8％,*** 5 wt.％ FNAT promotes forming the Sm2(Co,M)7 cell-wall phase and increases the coercivity and remanence by 272.7％ and 48.1％,***,the corresponding microstructure evolution models,magnetization,and demagnetization mechanisms are proposed.
The Segment Anything Model (SAM) is a vision big model proposed in 2023. It completes a series of segmentation tasks by prompt-driven, aiming to solve all image segmentation problems in a unified way. However, relevan...
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antagonistic interactions,data security and transient-steady state performance of the system are two key *** ensure data security,an intermittent privacy preservation(IPP)mechanism is proposed for the first time.A nov...
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antagonistic interactions,data security and transient-steady state performance of the system are two key *** ensure data security,an intermittent privacy preservation(IPP)mechanism is proposed for the first time.A novel setting time initial mask function and a novel intermittent mask function are *** can implement intermittent preservation for the system according to actual requirements,which solves the irreversibility problem after conventional mask disappears and balances control accuracy and system *** ensure transient-steady state performance,a novel error transformation function(ETF)is proposed and integrated into the predefined-time prescribed performance control *** to conventional hyperbolic tangent type ETFs,the proposed ETF can improve the convergence accuracy of errors under the same ***,a unified model of the air-sea HMASs is established,which improves the model accuracy compared with the simplified ***,the proposed IPP security control strategy is applied to the air-sea delivery mission to verify its feasibility and effectiveness.
Microbiologically influenced corrosion and bacterial infection lead to serious losses to human production and *** alloys with inherent antibacterial properties is a vital way to solve the above ***,the widely used Cu-...
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Microbiologically influenced corrosion and bacterial infection lead to serious losses to human production and *** alloys with inherent antibacterial properties is a vital way to solve the above ***,the widely used Cu-containing stainless steels show insufficient antimicrobial properties and relatively low yield strengths,which further limit their application in extreme service *** on the design concept of high-entropy alloys(HEAs),a novel low-cost Co-free CrFeNi_(0.5)Cu_(0.3)HEA with an optimal combination of antibacterial and mechanical properties was designed and *** alloy comprises triple-phase structures,including FeNi-rich face-centered cubic(FCC1),Cu-rich FCC2 and FeCr-rich body-centered cubic(BCC).The antibacterial rate of this HEA is up to 99.99%against Escherichia coli,which is far superior to that of classic 304 Cu-bearing stainless steel(304-Cu SS)and the most reported antibacterial *** addition,the HEA exhibits excellent mechanical properties with a tensile strength of 1032 MPa and yield strength of 842 MPa,far surpassing the corresponding values of 304-Cu SS(i.e.,528 MPa and 210 MPa,respectively).These findings provide new insights for the development of low-cost and high-performance antibacterial alloys.
The performance breakthroughs of some stealth materials have benefited from incorporating biomimetic concepts,and the design ideas of wave-absorbing metamaterials have been greatly ***-ever,stealth materials developed...
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The performance breakthroughs of some stealth materials have benefited from incorporating biomimetic concepts,and the design ideas of wave-absorbing metamaterials have been greatly ***-ever,stealth materials developed based on a single biological structure still have limitations regarding overall performance and design ***,a dual-structure element combination model with a butterfly-wing porous structure and moth-eye raised structure arranged in an orderly manner is *** iron and polyurethane are mixed as wave absorbents,and the model is utilized to make a biomimetic metamaterial(CSMA),which has an absorption rate of more than 90％at 6.07-18 GHz,achieving broadband effective *** has been verified that the two biostructures designed after an ordered arrangement show synergistic effects in the combined model,and the cooperation between the structures induces the formation of current vector vortices,which are able to induce microwave losses to broaden the effective absorbing ***,the model has the combined application perfor-mance of polarization insensitivity,strong stability of oblique incidence,and low bistatic *** a thought based on the combination of multiple components provides an effective strategy for the design of broadband-absorbing metamaterials.
Unsupervised domain adaptation (UDA) for time series classification (TSC) is an important but challenging task. In the process of UDA, feature learning is most critical. Most of the existing works in this area are bas...
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Dear Editor,In this letter, a constrained networked predictive control strategy is proposed for the optimal control problem of complex nonlinear highorder fully actuated (HOFA) systems with noises. The method can effe...
Dear Editor,In this letter, a constrained networked predictive control strategy is proposed for the optimal control problem of complex nonlinear highorder fully actuated (HOFA) systems with noises. The method can effectively deal with nonlinearities, constraints, and noises in the system, optimize the performance metric, and present an upper bound on the stable output of the system.
This paper considers the value iteration algorithms of stochastic zero-sum linear quadratic games with unkown ***-policy and off-policy learning algorithms are developed to solve the stochastic zero-sum games,where th...
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This paper considers the value iteration algorithms of stochastic zero-sum linear quadratic games with unkown ***-policy and off-policy learning algorithms are developed to solve the stochastic zero-sum games,where the system dynamics is not *** analyzing the value function iterations,the convergence of the model-based algorithm is *** equivalence of several types of value iteration algorithms is *** effectiveness of model-free algorithms is demonstrated by a numerical example.
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