Recently, redactable blockchain has been proposed and leveraged in a wide range of real systems for its unique properties of decentralization, traceability, and transparency while ensuring controllable on-chain data r...
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Recently, redactable blockchain has been proposed and leveraged in a wide range of real systems for its unique properties of decentralization, traceability, and transparency while ensuring controllable on-chain data redaction. However, the development of redactable blockchain is now obstructed by three limitations, which are data privacy breaches, high communication overhead, and low searching efficiency, respectively. In this paper, we propose PriChain, the first efficient privacy-preserving fine-grained redactable blockchain in decentralized settings. PriChain provides data owners with rights to control who can read and redact on-chain data while maintaining downward compatibility, ensuring the one who can redact will be able to read. Specifically, inspired by the concept of multi-authority attribute-based encryption, we utilize the isomorphism of the access control tree, realizing fine-grained redaction mechanism, downward compatibility, and collusion resistance. With the newly designed structure, PriChain can realize O（n） communication and storage overhead compared to prior O（n2） schemes. Furthermore, we integrate multiple access trees into a tree-based dictionary, optimizing searching efficiency. Theoretical analysis proves that PriChain is secure against the chosen-plaintext attack and has competitive complexity. The experimental evaluations show that PriChain realizes 10× efficiency improvement of searching and 100× lower communication and storage overhead on average compared with existing schemes.
In this work,the combined addition of strontium/indium(Sr/In)to the magnesium anode for Mg-Air Cells is investigated to improve discharge performance by modifying the anode/electrolyte *** exists as solid solution ato...
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In this work,the combined addition of strontium/indium(Sr/In)to the magnesium anode for Mg-Air Cells is investigated to improve discharge performance by modifying the anode/electrolyte *** exists as solid solution atoms in theα-Mg matrix without its second-phase generation,and at the same time facilitates grain refinement,dendritic segregation and Mg17Sr2-phases *** discharge operation,Sr modifies the film composition via its compounds and promoted the redeposition of In at the substrate/film interface;their co-deposition behavior on the anodic reaction surface enhances anode reaction kinetics,suppresses the negative difference effect(NDE)and mitigates the“chunk effect”(CE),which is contributed to uniform dissolution and low self-corrosion hydrogen evolution rate(HER).Therefore,Mg-Sr-xIn alloy anodes show excellent discharge performance,e.g.,0.5Sr-1.0In shows an average discharge voltage of 1.4234 V and a specific energy density of 1990.71 Wh kg^(-1)at 10 mA cm^(-2).Furthermore,the decisive factor(CE and self-discharge HE)for anodic efficiency are quantitively analyzed,the self-discharge is the main factor of cell efficiency ***,all Mg-Sr-xIn anodes show anodic efficiency greater than 60%at high current density(≥10 mA cm^(-2)),making them excellent candidate anodes for Mg-Air cells at high-power output.
Augmenting the working voltage is an effective way to maximize the energy density of Ni-rich layered Li[Ni0.8Co0.1Mn0.1]O2（NCM） to approach its theoretical ***,NCM suffers from structural degradation in deep delithi...
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Augmenting the working voltage is an effective way to maximize the energy density of Ni-rich layered Li[Ni0.8Co0.1Mn0.1]O2（NCM） to approach its theoretical ***,NCM suffers from structural degradation in deep delithiation state,which is often accompanied by severe surface lattice oxygen loss and transition metal dissolution,leading to restricted cycle ***,a facile and effective surfacestrengthening strategy is proposed,in which Mn（OH）2nanoshells are uniformly grown on the NCM surface as a Li+capturer and then converted to thin spinel Li4Mn5O12layers during subsequent hightemperature *** resultant Li4Mn5O12layers can enhance cathode-electrolyte interface electrochemical stability with inhibited electrolyte corrosion and accelerated Li+*** theoretical calculations confirms that the Mn-O bonds formed at the interfaces can effectively decrease the oxygen activity,thereby further inhibiting the lattice oxygen release and structural degradation caused by the irreversible phase ***,the Li4Mn5O12-coated NCM displays high capacity retention of 80.3% and 94.9% at 1 C and 5 C compared to the pristine NCM（52.5% and 10.1%） after 200 cycles and can operate stably at 2.7-4.6 V and 60℃.The spinel Li4Mn5O12-coating demonstrates an effective route to enhance the structural/electrochemical stability of NCM for next-generation advanced lithium-ion batteries.
Aqueous zinc-ion batteries（AZIBs） are gaining attention owing to their affordability,high safety,and high energy density,making them a promising solution for large-scale energy ***,their performance is hampered by t...
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Aqueous zinc-ion batteries（AZIBs） are gaining attention owing to their affordability,high safety,and high energy density,making them a promising solution for large-scale energy ***,their performance is hampered by the instability of both the anode-electrolyte interface and the cathode-electrolyte *** use of sodium gluconate（SG）,an organic sodium salt with multiple hydroxyl groups,as an electrolyte additive is *** and theoretical analyses demonstrate that Na+from SG can intercalate and deintercalate within the associated V2O5cathode during in situ electrochemical *** action supports the layered structure of V2O5,prevents structural collapse and phase transitions,and enhances Zn2+diffusion ***,the gluconate anion disrupts the original Zn2+solvation structure,mitigates water-induced side reactions,and suppresses Zn dendrite *** synchronous regulation of both the V2O5cathode and Zn anode by the SG additive leads to considerable performance ***‖Zn symmetric batteries demonstrate a cycle life exceeding 2800 h at 0.5 mA cm-2and 1 mAh *** Zn‖V2O5full batteries,a high specific capacity of 288.92 mAh g-1and capacity retention of 82.29% are maintained over 1000 cycles at a current density of 2 A *** multifunctional additive strategy offers a new pathway for the practical application of AZIBs.
In this study,the efects of diferent heat treatment process parameters on the microstructure and mechanical properties of Al-12Si-5Cu-1.1Mg-2.3Ni-0.3La alloy were *** showed that eutectic Si underwent three stages dur...
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In this study,the efects of diferent heat treatment process parameters on the microstructure and mechanical properties of Al-12Si-5Cu-1.1Mg-2.3Ni-0.3La alloy were *** showed that eutectic Si underwent three stages during solution treatment:difusing,spheroidization and *** the solution temperature and time increased,the size of eutectic Si showed a trend of frst decreasing and then *** with the heat treatment time,the heat treatment temperature had a more signifcant efect on the mechanical *** coarsening of microstructure was the main reason for the deterioration of mechanical *** Al_(3)Ti and Al_(3)CuNiLa in the microstructure after aging can signifcantly improve the mechanical properties of the *** Al_(11)La_(3) with secondary precipitation occurred in the La-rich *** addition of La inhibited the growth of coherent/semi-coherentθandβphases,which was very benefcial for the improvement of high-temperature *** the optimal heat treatment process parameters of 500℃×4 h+190℃×4 h,the ultimate tensile strength(UTS)of the alloy reached 366.65 *** high-temperature strength and elongation of the alloy reached 101.98 MPa and 13.77%at 350℃,respectively.
Based on the principles of thermodynamics, we elucidate the fundamental reasons behind the hysteresis of spontaneous polarization in ferroelectric materials during heating and cooling processes. By utilizing the effec...
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Based on the principles of thermodynamics, we elucidate the fundamental reasons behind the hysteresis of spontaneous polarization in ferroelectric materials during heating and cooling processes. By utilizing the effective Hamiltonian method in conjuction with the phase-field model, we have successfully reproduced the thermal hysteresis observed in ferroelectric materials during phase transitions. The computational results regarding the electrocaloric effect from these two different computational scales closely align with experimental measurements. Furthermore, we analyze how the first-order ferroelectric phase transition gradually diminishes with an increasing applied electric field, exhibiting characteristics of second-order-like phase transition. By employing the characteristic parameters of thermal hysteresis, we have established a pathway for calculations across different computational scales, thereby providing theoretical support for further investigations into the properties of ferroelectric materials through concurrent multiscale simulations.
This work introduces a novel Custom Question Answering (CQA) model leveraging Adam optimized Bidirectional Encoder Representations from Transformers (BERT-AO). This model tackles the challenge of combining textual and...
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In pumped hydro compressed air energy storage systems,the heat exchange performance between air and water significantly affects the thermodynamic *** study proposes an enhanced heat transfer method by adding trays and...
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In pumped hydro compressed air energy storage systems,the heat exchange performance between air and water significantly affects the thermodynamic *** study proposes an enhanced heat transfer method by adding trays and investigates the effects of parameters such as the number of trays,tray diameter,and tray mounting ***,the working principle of the heat transfer method when adding trays was clarified,and a mathematical model was ***,the effects of the number,diameter,and mounting height of the trays were ***,the thermodynamic,energy,and exergy performances of the system without trays,Tank 1 with trays,Tank 2 with trays,and Tanks 1 and 2 with trays were *** results show that the heat transfer between air and water is enhanced and the variation in air temperature is reduced when Tanks 1 and 2 have *** number and diameter of trays significantly affected the thermodynamic performance of the system,whereas the impact of the tray mounting height was not *** installing 30 trays uniformly in Tanks 1 and 2,the temperature variations in Tanks 1 and 2 were reduced by 8.2%and 15.4%,respectively;additionally,the round-trip and exergy efficiencies of the system were improved by 1.4%and 1.3%,respectively.
If adversaries were to obtain quantum computers in the future, their massive computing power would likely break existing security schemes. Since security is a continuous process, more substantial security schemes must...
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Motivated by the early works on bidirectional interaction and the breakthrough to estimate seismic response to bidirectional shaking via unidirectional analysis,it is essential to answer the question:When is the inter...
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Motivated by the early works on bidirectional interaction and the breakthrough to estimate seismic response to bidirectional shaking via unidirectional analysis,it is essential to answer the question:When is the interaction effect significant?Early works concluded that the effect of interaction is pronounced for stiff systems;consequently,the straightforward method for estimating seismic response to bidirectional excitation by using unidirectional analyses is verified primarily for short period ***,it is essential to identify the domain of significance for bidirectional interaction before adopting this simple methodology in *** parametrically defined systems with elastoplastic and degrading hysteresis models are studied under near-fault motions,assuming strength-independent and strength-dependent *** force-based and displacement-based analyses,conducted in parallel,reveal that the interaction effect is considerable for stiff systems,especially with degrading characteristics in a relatively low inelasticity ***,the bidirectional effect may be significant even for highly flexible systems,especially for residual deformation,which in earlier works was *** range of significance depends on the hysteresis model,system parameters,and response *** analysis is carried out with the results of the case studies,and the derived regression models may be used for a preliminary assessment of the impact of interaction in advance.
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