检索结果-内蒙古大学图书馆

DeCoTa: a lightweight decentralized cross-chain transfer scheme based on hash-locking

SCIENTIFIC REPORTS 2025年第1期15卷 1-15页

作者： Zou, Huiying Sun, Hua Chen, Sheng Ren, Wei Zheng, Xianghan China Univ Geosci Sch Comp Sci Wuhan 430074 Peoples R China Soochow Univ Adv Comp Prov Univ Key Lab Data Intelligence Suzhou Peoples R China Sichuan Univ Key Lab Data Protect & Intelligent Management Minist Educ Chengdu Peoples R China Third Surveying & Mapping Inst Hunan Prov Changsha Hunan Peoples R China Hunan Engn Res Ctr Geog Informat Secur & Applicat Changsha Hunan Peoples R China Hubei Univ Econ Hubei Key Lab Digital Finance Innovat Wuhan Peoples R China CASM State Key Lab Geoinformat Engn Key Lab Surveying & Mapping Sci & Geospatial Infor Beijing Peoples R China Fuzhou Univ Coll Comp & Big Data Fuzhou Peoples R China Sanya Coll Sch Informat & Intelligent Engn Sanya Peoples R China

With the wide application of blockchain comes the challenge of cross-chain interaction. For example, the isolation between the information stored in different blockchains can result in the "isolated islands of value" effect in blockchains. In addition, conventional cross-chain methods have a number of drawbacks such as centralization, or have a very restricted application scope. (e.g., hash-locking can only be utilized for asset exchanges, but asset transfer is a more common and demanding requirement). Other solutions like sidechain may be an overkill (e.g., too complex) for simple applications. To address these challenges, we propose an cross-chain transaction scheme that integrates hash-locking with notary mechanisms to enable decentralized asset transfers. By embedding notary scheme within the hash-lock structure, our approach ensures support for asset transfers while mitigating centralization risks. Additionally, we enhance the traditional hash-locking mechanism, making it more flexible and suitable for diverse cross-chain scenarios. This combination of hash-locking and notary scheme allows our scheme to overcome the original shortcomings of them both, while maintaining high efficiency and security. In addition to designing the transaction method, we also constructed a transaction model, conducted experiments on transaction gas consumption, performed a detailed security analysis, and presented an in-depth discussion of our scheme while proposing directions for future work. Experiment and analysis demonstrate the practicability of our scheme in terms of performance and security.

关键词： Cross-chain Blockchain Hash-locking Notary scheme Decentralization Smart contract

来源：评论

学校读者我要写书评

暂无评论

Self-Interference Digital Optofluidic Genotyping for Integrated and Automated Label-Free Pathogen Detection

引用

ACS SENSORS 2024年第12期9卷 6411-6420页

作者： Zhou, Tianqi Fu, Rongxin Hou, Jialu Yang, Fan Chai, Fengli Mao, Zeyin Deng, Anni Li, Fenggang Guan, Yanfang Hu, Hanqi Li, Hang Lu, Yao Huang, Guoliang Zhang, Shuailong Xie, Huikai Beijing Inst Technol Sch Med Technol Beijing 100081 Peoples R China Beijing Inst Technol Zhengzhou Res Inst Zhengzhou 450000 Henan Peoples R China Beijing Inst Technol Engn Res Ctr Integrated Acousto Optoelect Microsys Sch Integrated Circuits & Elect Minist Educ China Beijing 100081 Peoples R China Beijing Inst Technol Chongqing Inst Microelect & Microsyst Chongqing 400000 Peoples R China Beijing Inst Technol Sch Mech Engn Beijing Adv Innovat Ctr Intelligent Robots & Syst Beijing 100081 Peoples R China Tsinghua Univ Sch Biomed Engn Beijing 100084 Peoples R China Henan Univ Technol Sch Mech & Elect Engn Zhengzhou 450052 Henan Peoples R China

Pathogen, prevalent in both natural and human environments, cause approximately 4.95 million deaths annually, ranking them among the top contributors to global mortality. Traditional pathogen detection methods, reliant on microscopy and cultivation, are slow and labor-intensive and often produce subjective results. While nucleic acid amplification techniques such as polymerase chain reaction offer genetic accuracy, they necessitate costly laboratory equipment and skilled personnel. Consequently, isothermal amplification methods like recombinase polymerase amplification (RPA) have attracted interest for their rapid and straightforward operations. However, these methods face challenges in specificity and automated sample processing. In this study, we introduce a self-interferometric digital optofluidic platform incorporating asymmetric direct solid-phase RPA for real-time, label-free, and automated pathogen genotyping. By integration of digital microfluidics with a DNA monolayer detection method using hyperspectral interferometry, this platform enables rapid, specific, and sensitive pathogen detection without the need for exogenous labeling or complex procedures. The system demonstrated high sensitivity (10 CFUmL-1), specificity (differentiating four Candida species), detection efficiency (fully automated within 50 min for Gram-negative bacteria), and throughput (simultaneous detection of four indices). This integrated approach to pathogen quantitation on a single microfluidic chip represents a significant advancement in rapid pathogen diagnostics, providing a practical solution for timely pathogen detection and analysis.

关键词： optical biosensor optofluidic in vitro diagnosis digital microfluidics recombinase polymerase amplification microbial analysis

来源：评论

学校读者我要写书评

暂无评论

Simultaneously Geometrical and Electronic Modulation of L10-PtZn by Trace Ge Boosts High-performance Oxygen Reduction Reaction

引用

SMALL 2024年第15期20卷 2305296-2305296页

作者： Lu, Shaojie Hu, Yiping Xia, Fanjie Yang, Shaokang Jiang, Shuaihu Zhou, Yu Ma, Dongsheng Zhang, Wenjing Li, Jing Wu, Jinsong Rao, Dewei Yue, Qin Univ Elect Sci & Technol China Inst Fundamental & Frontier Sci Chengdu 610054 Peoples R China Wuhan Univ Technol State Key Lab Adv Technol Mat Synth & Proc NRC Nanostruct Res Ctr Wuhan 430070 Peoples R China Jiangsu Univ Sch Mat Sci & Engn Zhenjiang 212013 Peoples R China Chongqing Univ Dept Sch Chem & Chem Engn Chongqing 401331 Peoples R China

Developing a highly active, durable, and low-platinum-based electrocatalyst for the cathodic oxygen reduction reaction (ORR) is for breaking the bottleneck of large-scale applications of proton exchange membrane fuel cells (PEMFCs). Herein, ultrafine PtZn intermetallic nanoparticles with low Pt-loading and trace germanium (Ge) involvement confined in the nitrogen-doped porous carbon (Ge-L-10-PtZn@N-C) are reported. The Ge-L-10-PtZn@N-C exhibit superior ORR activity with a mass activity of 3.04 A mg(Pt)(-1) and specific activity of 4.69 mA cm(-2), approximate to 12.2- and 10.2-times improvement compared to the commercial Pt/C (20%) at 0.90 V in 0.1 m KOH. The cathodic catalyst Ge-L-10-PtZn@N-C assembled in the PEMFC shows encouraging peak power densities of 316.5 (at 0.86 V) and 417.2 mW cm(-2) (at 0.91 V) in alkaline and acidic fuel-cell, respectively. The combination of experiment and density functional theory calculations (DFT) results robustly reveal that the participation of trace Ge can not only trigger a "growth site locking effect" to effectively inhibit nanoparticle growth, bring miniature nanoparticles, enhance dispersion uniformity, and achieve the exposure of the more electrochemical active site, but also effectively modulates the electronic structure, hence optimizing the adsorption/desorption of the oxygen intermediates.

关键词： Ge doping intermetallic nanoparticles low-platinum oxygen reduction reactions proton exchange membrane fuel cells

来源：评论

学校读者我要写书评

暂无评论

Reversible Zn Metal Anodes Enabled by Trace Amounts of Underpotential Deposition Initiators

引用

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 2023年第18期62卷 e202301192-e202301192页

作者： Dai, Yuhang Zhang, Chengyi Zhang, Wei Cui, Lianmeng Ye, Chumei Hong, Xufeng Li, Jinghao Chen, Ruwei Zong, Wei Gao, Xuan Zhu, Jiexin Jiang, Peie An, Qinyou Brett, Dan J. L. Parkin, Ivan P. He, Guanjie Mai, Liqiang Wuhan Univ Technol State Key Lab Adv Technol Mat Synth & Proc Wuhan 430070 Peoples R China UCL Dept Chem Christopher Ingold Lab London WC1H 0AJ England UCL Dept Chem Engn Electrochem Innovat Lab London WC1E 7JE England Wuhan Univ Inst Technol Sci Wuhan 430072 Peoples R China Univ Cambridge Dept Mat Sci & Met Cambridge CB3 0FS England Peking Univ Sch Mat Sci & Engn Beijing Key Lab Theory & Technol Adv Batteries Mat Beijing 100871 Peoples R China

Routine electrolyte additives are not effective enough for uniform zinc (Zn) deposition, because they are hard to proactively guide atomic-level Zn deposition. Here, based on underpotential deposition (UPD), we propose an "escort effect" of electrolyte additives for uniform Zn deposition at the atomic level. With nickel ion (Ni2+) additives, we found that metallic Ni deposits preferentially and triggers the UPD of Zn on Ni. This facilitates firm nucleation and uniform growth of Zn while suppressing side reactions. Besides, Ni dissolves back into the electrolyte after Zn stripping with no influence on interfacial charge transfer resistance. Consequently, the optimized cell operates for over 900 h at 1 mA cm(-2) (more than 4 times longer than the blank one). Moreover, the universality of "escort effect" is identified by using Cr3+ and Co2+ additives. This work would inspire a wide range of atomic-level principles by controlling interfacial electrochemistry for various metal batteries.

关键词： Aqueous Battery Electrolyte Additive Interfacial Electrochemistry Underpotential Deposition Zinc Anode

来源：评论

学校读者我要写书评

暂无评论

Efficient and Secure Spatial Range Query over Large-scale Encrypted Data 43

Efficient and Secure Spatial Range Query over Large-scale En...

引用

43rd IEEE International Conference on Distributed Computing Systems (ICDCS)

作者： Miao, Yinbin Xu, Chao Zheng, Yifeng Liu, Ximeng Meng, Xiangdong Deng, Robert H. Xidian Univ Sch Cyber Engn Xian Peoples R China Harbin Inst Technol Sch Comp Sci & Technol Shenzhen Peoples R China Fuzhou Univ Sch Math & Comp Sci Fuzhou Peoples R China Henan Key Lab Network Cryptog Technol Zhengzhou Peoples R China Singapore Management Univ Sch Informat Syst Singapore Singapore

ISBN: (纸本)9798350339864

Spatial range query enjoys widespread application scenarios due to the ever-growing geo-positioning technology in recent years. Huge amounts of encrypted geo-location data are being outsourced to cloud servers to alleviate local storage and computational overheads without leaking sensitive information. However, most existing Privacy-preserving Spatial Range Query (PSRQ) cannot achieve high efficiency while satisfying strong security over large-scale encrypted spatial data. To strike a best-possible balance between security and efficiency, we propose a novel efficient Privacy-preserving Spatial Range Query (ePSRQ) scheme in dual-cloud architecture over large-scale dataset. Specifically, we propose an efficient PSRQ scheme by designing a novel index structure based on Geohash algorithm, Circular Shift and Coalesce Zero-Sum Garbled Bloom Filter (CSC-ZGBF) and Symmetric Homomorphic Encryption (SHE), which makes the computational complexity of query process independent of dataset size. Formal security analysis proves that our scheme can achieve Indistinguishability against Chosen-Plaintext Attack (IND-CPA), and extensive experiments prove that our scheme is feasible in real-world applications.

关键词： Spatial range query privacy-preserving encrypted spatial data dual-cloud large-scale dataset

来源：评论

学校读者我要写书评

暂无评论

Interfacial reaction mechanism between Stellite 6 alloy and CuO

引用

MATERIALS LETTERS 2022年 318卷 132193-132193页

作者： Wang, Ruidong Hu, Rong Zhang, Jun Zhang, Chao Li, Guangshi Zhang, Yuwen Wu, Wenhe Lu, Xionggang Shanghai Univ State Key Lab Adv Special Steel Shanghai 200444 Peoples R China Shanghai Univ Shanghai Key Lab Adv Ferromet Shanghai 200444 Peoples R China Shanghai Univ Sch Mat Sci & Engn Shanghai 200444 Peoples R China

The interfacial reaction of Stellite 6 alloy with CuO at 1200 degrees C in pure argon was investigated. The bubbling phenomenon was observed during the reaction. The results show that the reaction produced solid oxides (CoO, Cr2O3, SiO2, MnO2 and CoCr2O4/NiCr2O4/Fe3O4) and pure copper, as well as possible CO and CO2 gases. The product gases and oxides caused holes and cracks in the sample.

关键词： Stellite 6 CuO Interfacial reactions Defects Microstructure

来源：评论

学校读者我要写书评

暂无评论

Free Fault Leakages for Deep Exploitation: Algebraic Persistent Fault Analysis on Lightweight Block Ciphers

IACR Transactions on Cryptographic Hardware and Embedded Sys...

引用

IACR Transactions on Cryptographic Hardware and Embedded Systems 2022年第2期2022卷 289-311页

作者： Zhang, Fan Feng, Tianxiang Li, Zhiqi Ren, Kui Zhao, Xinjie School of Cyber Science and Technology College of Computer Science and Technology Zhejiang University Hangzhou310027 China State Key Laboratory of Cryptology P.O.Box 5159 Beijing100878 China Alibaba-Zhejiang University Joint Research Institute of Frontier Technologies Hangzhou310027 China Key Laboratory of Blockchain and Cyberspace Governance of Zhejiang Province Hangzhou310027 China Henan Province Key Laboratory of Cyberspace Situation Awareness Zhengzhou450001 China

Persistent Fault Analysis (PFA) is a new fault analysis method for block ciphers proposed in CHES 2018, which utilizes those faults that persist in encryptions. However, one fact that has not been raised enough attention is that: while the fault itself does persist in the entire encryption, the corresponding statistical analysis merely leverages fault leakages in the last one or two rounds, which ignores the valuable leakages in deeper rounds. In this paper, we propose Algebraic Persistent Fault Analysis (APFA), which introduces algebraic analysis to facilitate PFA. APFA tries to make full usage of the free fault leakages in the deeper rounds without incurring additional fault injections. The core idea of APFA is to build similar algebraic constraints for the output of substitution layers and apply the constraints to as many rounds as possible. APFA has many advantages compared to PFA. First, APFA can bypass the manual deductions of round key dependencies along the fault propagation path and transfer the burdens to the computing power of machine solvers such as Crypto-MiniSAT. Second, thanks to the free leakages in the deeper round, APFA requires a much less number of ciphertexts than previous PFA methods, especially for those lightweight block ciphers such as PRESENT, LED, SKINNY, etc. Only 10 faulty ciphertexts are required to recover the master key of SKINNY-64-64, which is about 155 times of reduction as compared to the state-of-the-art result. Third, APFA can be applied to the block ciphers that cannot be analyzed by PFA due to the key size, such as PRESENT-128. Most importantly, APFA replaces statistical analysis with algebraic analysis, which opens a new direction for persistent-fault related researches. © 2022, Ruhr-University of Bochum. All rights reserved.

关键词： Side channel attack

来源：评论

学校读者我要写书评

暂无评论

Decomposition and prediction of hydrodynamic loads on a floating counter-rotating tidal turbine under surge motion

引用

PHYSICS OF FLUIDS 2024年第10期36卷

作者： Sun, Jiyuan Miao, Hongjiang Wang, Pengzhong Huang, Bin Wang, Yu Zhejiang Univ Ocean Coll Zhoushan 316021 Peoples R China Hangzhou Dalu Ind Co Ltd Hangzhou 311227 Zhejiang Peoples R China Zhejiang Univ Ocean Res Ctr Zhoushan Zhoushan 316021 Peoples R China Tonglu MOULD Machinery Mfg Co Ltd Hangzhou 310027 Peoples R China

In the actual marine environment, the hydrodynamic characteristics of floating counter-rotating tidal turbines (FCRTTs) are influenced by the motion responses of their carrier platforms. Therefore, accurately analyzing and predicting hydrodynamic loads under the motions of FCRTTs are crucial. In this paper, a fitting formula for hydrodynamic loads of FCRTTs applicable to rotational motion is derived. Then, the effects of surge amplitude, surge frequency, and tip speed ratio on the hydrodynamic loads of an FCRTT are also calculated. It is found that the instantaneous load fluctuation of the rear rotor is more severe than that of the front rotor. However, the average torque of both rotors is similar, which can effectively enhance the operational stability of the FCRTT. Additionally, the hydrodynamic loads are decomposed into average hydrodynamic force, damping force, and added mass force based on the least squares method. A fitting formula for the hydrodynamic loads applicable to different surge conditions is derived, incorporating 11 hydrodynamic coefficients. The results indicate that the damping coefficients n(P)(0) and n(T)(0) play a dominant role in the fluctuation amplitude of the hydrodynamic loads. Finally, an effective and fast prediction model for various hydrodynamic coefficients is successfully established using the three-dimensional radial basis function. The relative errors between the predicted peak values of all performance coefficients and the values calculated using the computational fluid dynamics (CFD) method are within -3.5%. This paper provides important guidance for engineering design and load prediction of FCRTTs. Moreover, the predictive methodology can be extended for application to other single-degree-of-freedom and couple motions.

关键词： Damping

来源：评论

学校读者我要写书评

暂无评论

Proximal Policy Optimization-Based Transmit Beamforming and Phase-Shift Design in an IRS-Aided ISAC System for the THz Band

引用

IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2022年第7期40卷 2056-2069页

作者： Liu, Xiangnan Zhang, Haijun Long, Keping Zhou, Mingyu Li, Yonghui Poor, H. Vincent Univ Sci & Technol Beijing Beijing Adv Innovat Ctr Mat Genome Engn Beijing Engn & Technol Res Ctr Convergence Networ Inst Artificial Intelligence Beijing 100083 Peoples R China BaiCells Technol Co Beijing 100094 Peoples R China Univ Sydney Sch Elect & Informat Engn Sydney NSW 2006 Australia Princeton Univ Dept Elect & Comp Princeton NJ 08544 USA

In this paper, an IRS-aided integrated sensing and communications (ISAC) system operating in the terahertz (THz) band is proposed to maximize the system capacity. Transmit beamforming and phase-shift design are transformed into a universal optimization problem with ergodic constraints. Then the joint optimization of transmit beamforming and phase-shift design is achieved by gradient-based, primal-dual proximal policy optimization (PPO) in the multi-user multiple-input single-output (MISO) scenario. Specifically, the actor part generates continuous transmit beamforming and the critic part takes charge of discrete phase shift design. Based on the MISO scenario, we investigate a distributed PPO (DPPO) framework with the concept of multi-threading learning in the multi-user multiple-input multiple-output (MIMO) scenario. Simulation results demonstrate the effectiveness of the primal-dual PPO algorithm and its multi-threading version in terms of transmit beamforming and phase-shift design.

关键词： Array signal processing Optimization Sensors MISO communication Resource management Wireless communication Radar Integrated sensing and communications transmit beamforming phase shift design intelligent reflecting surface distributed reinforcement learning

来源：评论

学校读者我要写书评

暂无评论

Primal-Dual Learning for Cross-Layer Resource Management in Cell-Free Massive MIMO IIoT

引用

IEEE INTERNET OF THINGS JOURNAL 2022年第18期9卷 17026-17034页

作者： Liu, Xiangnan Zhang, Haijun Wen, Xiangming Long, Keping Wang, Jianquan Sun, Lei Univ Sci & Technol Beijing Inst Artificial Intelligence Beijing Adv Innovat Ctr Mat Genome Engn Beijing Engn & Technol Res Ctr Convergence Networ Beijing 100083 Peoples R China Beijing Univ Posts & Telecommun Sch Informat & Commun Engn Beijing Key Lab Network Syst Architecture & Conve Beijing 100876 Peoples R China Beijing Univ Posts & Telecommun Beijing Lab Adv Informat Networks Beijing 100876 Peoples R China Univ Sci & Technol Beijing Sch Automat & Elect Engn Beijing 100083 Peoples R China

The use of cell-free massive multiple-input-multiple-output (MIMO) is regarded as a novel technique in the Industrial Internet of Things (IIoT) networks, and many studies have been reported on its cross-layer optimization, including random access and power allocation. Nevertheless, the cooperation of deep reinforcement learning (DRL) and cell-free massive lacks of deep study. In this article, a primal-dual deep deterministic policy gradient (DDPG) algorithm is designed to obtain cross-layer radio resource management, including power allocation in the physical layer and random access in the medium access layer. Different from the current studies, the random access and power allocation is formulated in cell-free massive MIMO IIoT networks, utilized by the stochastic ergodic optimization. In contrast to the stochastic policy gradient algorithm, a primal-dual DDPG algorithm is designed for the cross-layer optimization. Moreover, a multiagent primal-dual DDPG algorithm is proposed to different scenarios in the cell-free massive MIMO IIoT networks. Simulations are presented to verify the effectiveness of the primal-dual DDPG algorithm for random access and power allocation in the cell-free massive MIMO IIoT networks.

关键词： Cell-free massive multiple-input-multiple-output (MIMO) Industrial Internet of Things (IIoT) power allocation primal-dual learning random access

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：