检索结果-南通市图书馆

Modulation of electronic state in copper-intercalated 1T-TaS_(2)

Nano Research 2022年第5期15卷 4327-4333页

作者： Wenhao Zhang Degong Ding Jingjing Gao Kunliang Bu Zongxiu Wu Li Wang Fangsen Li Wei Wang Xuan Luo Wenjian Lu Chuanhong Jin Yuping Sun Yi Yin Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310027China State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China Vacuum Interconnected Nanotech workstation(Nano-X) Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of Sciences(CAS)Suzhou 215123China High Magnetic Field Laboratory HFIPSChinese Academy of SciencesHefei 230031China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Intercalation is an effective method to modify physical properties and induce novel electronic states of transition metal dichalcogenide(TMD)***,it is difficult to reveal the microscopic electronic state evolution in the intercalated *** we successfully synthesize the copper-intercalated 1T-TaS_(2) and characterize the structural and electronic modification combining resistivity measurements,atomic-resolution scanning transmission electron microscopy(ADF-STEM),and scanning tunneling microscopy(STM).The intercalated Cu atom is determined to be directly below the Ta atom and suppresses the commensurate charge density wave(CCDW)*** specific electronic modulations are discovered in the near-commensurate(NC)CDW phase:the electron doping state near the defective star of Davids(SDs)in metallic domains and the spatial evolution of the Mott gap in insulating *** modulations reveal that intercalated Cu atoms act as a medium to enhance the interaction between intralayer SDs,in addition to the general charge transfer *** also solidifies the Mott foundation of the insulating gap in pristine *** intriguing electronic evolution in Cu-intercalated 1T-TaS_(2) will motivate further exploration of novel electronic states in the intercalated TMD materials.

关键词： intercalation scanning tunneling microscopy Mott insulator charge transfer electron doping

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Differentially Authorized Deduplication System Based on Blockchain

引用

ZTE Communications 2021年第2期19卷 67-76页

作者： ZHAO Tian LI Hui YANG Xin WANG Han ZENG Ming GUO Haisheng WANG Dezheng Shenzhen Graduate School Peking UniversityShenzhen 518055China ZTE Corporation Shenzhen 518057China

In architecture of cloud storage, the deduplication technology encrypted with theconvergent key is one of the important data compression technologies, which effectively improvesthe utilization of space and bandwidth. To further refine the usage scenarios for varioususer permissions and enhance user’s data security, we propose a blockchain-based differentialauthorized deduplication system. The proposed system optimizes the traditionalProof of Vote (PoV) consensus algorithm and simplifies the existing differential authorizationprocess to realize credible management and dynamic update of authority. Based on thedecentralized property of blockchain, we overcome the centralized single point fault problemof traditional differentially authorized deduplication system. Besides, the operations oflegitimate users are recorded in blocks to ensure the traceability of behaviors.

关键词： convergent key deduplication blockchain differential authorization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Analysis of L1-Galerkin FEMs for Time-Fractional Nonlinear Parabolic Problems

引用

Communications in Computational Physics 2018年第6期24卷 86-103页

作者： Dongfang Li Hong-Lin Liao Weiwei Sun Jilu Wang Jiwei Zhang School of Mathematics and Statistics Huazhong University of Science and TechnologyWuhan430074China Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and TechnologyWuhan 430074China Department of Mathematics City University of Hong KongKowloonHong Kong Department of Mathematics Nanjing University of Aeronautics and AstronauticsNanjing211106China Department of Scientific Computing Florida StateUniversityTallahasseeFL 32306USA Beijing Computational Science Research Center Beijing 100094China.

This paper is concerned with numerical solutions of time-fractional nonlinear parabolic problems by a class of L1-Galerkin finite element *** analysis of L1 methods for time-fractional nonlinear problems is limited mainly due to the lack of a fundamental Gronwall type *** this paper,we establish such a fundamental inequality for the L1 approximation to the Caputo fractional *** terms of the Gronwall type inequality,we provide optimal error estimates of several fully discrete linearized Galerkin finite element methods for nonlinear *** theoretical results are illustrated by applying our proposed methods to the time fractional nonlinear Huxley equation and time fractional Fisher equation.

关键词： Time-fractional nonlinear parabolic problems L1-Galerkin FEMs Error estimates discrete fractional Gronwall type inequality Linearized schemes

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Optimization of the Hot Pressing Process for Preparing Flax Fiber/PE Thermoplastic Composite

引用

Mechanical Engineering Science 2019年第1期1卷 41-45页

作者： Yiqi Wang Guangpeng Cui Zhujian Shao Yongjie Bao Hang Gao Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education Dalian University of TechnologyDalian 116024China Marine engineering college Dalian Maritime UniversityDalian 116026China

The hot pressing process parameters were optimized to prepare flax fiber reinforced polyethylene(PE)thermoplastic composite by the Taguchi *** optimal hot pressing process parameters were determined to increase the tensile strength of the *** optimal parameters of the design include the following sections:hot pressing temperature,pressure,hot pressing time and coupling agent modification *** L9(3*4)orthogonal matrix based on the Taguchi method was *** means of analysis of signal-to-noise ratio and analysis of variance,the optimal hot pressing process parameters combination was found,compared to the average tensile strength in the nine design experiments,and the tensile strength was improved nearly 10%.

关键词： flax fiber hot pressing process optimization Taguchi method ANOVA

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Special Issue Devoted to Petroleum Geology in Marginal Sea Deepwater Settings—Take the South China Sea as an Example

引用

Acta Geologica Sinica(English Edition) 2021年第1期95卷 I0001-I0006页

作者： ZHANG Gongcheng FENG Yangwei State Key Laboratory of Continental Dynamics Northwest UniversityXi'an 710069China Department of Geology Northwest UniversityXi'an 710069China CNOOC Research Institute Co. Ltd.Beijing 100028China School of Geographical Science and Tourism Nanyang Normal UniversityNanyangHenan 473061China School of Earth Sciences East China University of TechnologyNanchang 330013China PetroJindian(Beijing)Sci-Tech Co. Ltd.Beijing 100000China

1 Deepwater Settings of Marginal Seas一the Frontier of Oil and Gas Exploration From the perspective of geographical environment,the areas of global oil and gas exploration can be divided into land,shallow water and deep water *** timespan of oil and gas discovery in each field is *** and gas have been discovered on land since ancient tinies,but the application of modern technology to discover oil and gas began in 1859 in Pennsylvania,USA(Hua,1984).Largescale oil and gas exploration began in the 1920s,and the reserve discovery reached its peak in the 1960s and 1970s.

关键词： shallow Deep exploration

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Survey on Adversarial Examples in Deep Learning

引用

Journal on Big Data 2020年第2期2卷 71-84页

作者： Kai Chen Haoqi Zhu Leiming Yan Jinwei Wang School of Computer&Software Nanjing University of Information Science&TechnologyNanjing210044China School of Atmospheric Sciences Nanjing University of Information Science&TechnologyNanjing210044China

Adversarial examples are hot topics in the field of security in deep *** feature,generation methods,attack and defense methods of the adversarial examples are focuses of the current research on adversarial *** article explains the key technologies and theories of adversarial examples from the concept of adversarial examples,the occurrences of the adversarial examples,the attacking methods of adversarial *** article lists the possible reasons for the adversarial *** article also analyzes several typical generation methods of adversarial examples in detail:Limited-memory BFGS(L-BFGS),Fast Gradient Sign Method(FGSM),Basic Iterative Method(BIM),Iterative Least-likely Class Method(LLC),***,in the perspective of the attack methods and reasons of the adversarial examples,the main defense techniques for the adversarial examples are listed:preprocessing,regularization and adversarial training method,distillation method,etc.,which application scenarios and deficiencies of different defense measures are pointed *** article further discusses the application of adversarial examples which currently is mainly used in adversarial evaluation and adversarial ***,the overall research direction of the adversarial examples is prospected to completely solve the adversarial attack *** are still a lot of practical and theoretical problems that need to be *** out the characteristics of the adversarial examples,giving a mathematical description of its practical application prospects,exploring the universal method of adversarial example generation and the generation mechanism of the adversarial examples are the main research directions of the adversarial examples in the future.

关键词： Adversarial examples generation methods defense methods

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Global Energetics of Solar Powerful Events on 2017 September 6

引用

天文和天体物理学研究:英文版 2023年第9期23卷 180-193页

作者： Dong Li Alexander Warmuth Jincheng Wang Haisheng Zhao Lei Lu Qingmin Zhang Nina Dresing Rami Vainio Christian Palmroos Miikka Paassilta Annamaria Fedeli Marie Dominique Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China State Key Laboratory of Space Weather Chinese Academy of SciencesBeijing 100190China Leibniz-Institut fur Astrophysik Potsdam(AIP) An der Sternwarte 16D-14482 PotsdamGermany Yunnan Observatories Chinese Academyof Sciences.Kunming 650216China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsCASBeijing 00049China Department of Physics and Astronomy University of TurkuTurku 20014Finland Solar-Terrestrial Centre of Excellence/SIDC Royal Observatory of Belgium3 Avenue CirculaireB-1180 UccleBelgium

Solar flares and coronal mass ejections(CMEs)are thought to be the most powerful events on the *** can release energy as high as~10^(32)erg in tens of minutes,and also can release solar energetic particles(SEPs)into interplanetary *** explore global energy budgets of solar major eruptions that occurred on 2017 September 6,including the energy partition of a powerful solar flare,and the energy budget of the accompanying CME and *** the wavelength range shortward of~222 nm,a major contribution of the flare radiated energy is in the soft X-ray(SXR)0.1-7 nm *** flare energy radiated at wavelengths of Lyαand mid-ultraviolet is larger than that radiated in the extreme ultraviolet wavelengths,but it is much less than that radiated in the SxR *** total flare radiated energy could be comparable to the thermal and nonthermal *** energies carried by the major flare and its accompanying CME are roughly equal,and they are both powered by the magnetic free energy in the NOAA AR ***,the CME is efficient in accelerating SEPs,and the prompt component(whether it comes from the solar flare or the CME)contributes only a negligible fraction.

关键词： Sun flares-Sun magnetic fields-Sun coronal mass ejections(CMEs)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Lightweight and Efficient Attention-Based Superresolution Generative Adversarial Networks

引用

国际计算机前沿大会会议论文集 2023年第1期 165-181页

作者： Shushu Yin Hefan Li Yu Sang Tianjiao Ma Tie Li Mei Jia School of Electronic and Information Engineering Liaoning Technical UniversityHuludao 125105China The First Affiliated Hospital Dalian Medical UniversityDalian 116011China

To address the problems of lack of high-frequency information and texture details and unstable training in superresolution generative adversarial net-works,this paper optimizes the generator and discriminator based on the SRGAN ***,the residual dense block is used as the basic structural unit of the gen-erator to improve the network’s feature extraction ***,enhanced lightweight coordinate attention is incorporated to help the network more precisely concentrate on high-frequency location information,thereby allowing the gener-ator to produce more realistic image reconstruction ***,we propose a symmetric and efﬁcient pyramidal segmentation attention discriminator network in which the attention mechanism is capable of derivingﬁner-grained multiscale spatial information and creating long-term dependencies between multiscale chan-nel attentions,thus enhancing the discriminative ability of the ***,a Charbonnier loss function and a gradient variance loss function with improved robustness are used to better realize the image’s texture structure and enhance the model’s ***ﬁndings from the experiments reveal that the reconstructed image quality enhances the average peak signal-to-noise ratio(PSNR)by 1.59 dB and the structural similarity index(SSIM)by 0.045 when compared to SRGAN on the three test *** with the state-of-the-art methods,the reconstructed images have a clearer texture structure,richer high-frequency details,and better visual effects.

关键词： Superresolution Generative adversarial networks Attention mechanism Texture structure Residual dense blocks

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Position Self-Adaptive Method to Detect Fake Access Points

引用

Journal of Quantum Computing 2020年第2期2卷 119-127页

作者： Ping Lu Information Security Center State Key Laboratory of Networking and Switching TechnologyBeijing University of Posts and TelecommunicationsBeijing100876China Guizhou University Sate Key Laboratory of Public Big DataGuiyang550025China

In recent years,with the maturity and popularity of Wi-Fi technology,wireless hotspots have been deployed on a large scale in public *** at the same time,it brings many security issues that cannot be *** them,the fake access point attack is a very serious threat in wireless local area *** this paper,we propose a method to detect fake access points in wireless local area ***,our detection method is passive,which means there is almost no additional traffic will be generated during the program’s ***,different from many existing methods,our method allows the detection device to change position,the move will be perceived and the fingerprint will be updated ***,we use a variety of features as fingerprints to describe an access point better and improve *** last,the method we propose is more in line with the actual scene and has been proved effective by experiments.

关键词： Fake AP WLAN beacon frame

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cipherchain:A Secure and Efficient Ciphertext Blockchain via mPECK

引用

Journal of Quantum Computing 2020年第1期2卷 57-83页

作者： Hailin Chen Gang Xu Yuling Chen Xiubo Chen Yixian Yang Ruibin Fan Kaixiang Zhang Huizhong Li Information Security Center State Key Laboratory of Networking and Switching TechnologyBeijing University of Posts and TelecommunicationsBeijing100876China Guizhou University Sate Key Laboratory of Public Big DataGuizhou550025China North China University of Technology School of Computing Science and TechnologyBeijingChina Webank Shenzhen518000China

Most existing blockchain schemes are based on the design concept“openness and transparency”to realize data security,which usually require transaction data to be presented in the form of ***,it inevitably brings the issues with respect to data privacy and operating *** this paper,we proposed a novel blockchain scheme called Cipherchain,which can process and maintain transaction data in the form of ciphertext while the characteristics of immutability and auditability are *** in our scheme,transactions can be encrypted locally based on a searchable encryption scheme called multi-user public key encryption with conjunctive keyword search(mPECK),and can be accessed by multiple specific participants after appended to the globally consistent distributed *** introducing execution-consensus-update paradigm of transaction flow,Cipherchain cannot only make it possible for transaction data to exist in the form of ciphertext,but also guarantee the overall system performance not greatly affected by cryptographic operations and other local execution *** addition,Cipherchain is a promising scheme to realize the technology combination of“blockchain+cloud computing”and“permissioned blockchain+public blockchain”.

关键词： Blockchain Cipherchain cloud computing mPECK

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：