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A Self-Powered Nanogenerator for the Electrical Protection of Integrated Circuits from Trace Amounts of Liquid

Nano-Micro Letters 2020年第1期12卷 54-62页

作者： Zhuang Hui Ming Xiao Daozhi Shen Jiayun Feng Peng Peng Yangai Liu Walter WDuley YNorman Zhou Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of GeosciencesBeijing 100083People’s Republic of China Department of Mechanics and Mechatronics Engineering Centre for Advanced Materials JoiningUniversity of WaterlooWaterlooON N2L 3G1Canada School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191People’s Republic of China Waterloo Institute of Nanotechnology University of WaterlooWaterlooON N2L 3G1Canada Institute for Quantum Computing University of WaterlooWaterlooON N2L 3G1Canada State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001People’s Republic of China Department of Physics and Astronomy University of WaterlooWaterlooON N2L 3G1Canada

With the increase in the use of electronic devices in many different environments,a need has arisen for an easily implemented method for the rapid,sensitive detection of liquids in the vicinity of electronic *** this work,a high-performance power generator that combines carbon nanoparticles and TiO2 nanowires has been fabricated by sequential electrophoretic deposition(EPD).The opencircuit voltage and short-circuit current of a single generator are found to exceed 0.7 V and 100μA when 6μL of water was *** generator is also found to have a stable and reproducible response to other *** output voltage of 0.3 V was obtained after 244,876,931,and 184μs,on exposure of the generator to 6μL of water,ethanol,acetone,and methanol,*** fast response time and high sensitivity to liquids show that the device has great potential for the detection of small quantities of *** addition,the simple easily implemented sequential EPD method ensures the high mechanical strength of the *** compact,reliable device provides a new method for the sensitive,rapid detection of extraneous liquids before they can impact the performance of electronic circuits,particularly those on printed circuit board.

关键词： Self-powered generator Sub-millisecond response Liquid protection

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A dynamic network change detection method using network embedding 4th

A dynamic network change detection method using network embe...

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4th International Conference on Cloud computing and Security, ICCCS 2018

作者： Sun, Tong Liu, Yan China State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

ISBN: (纸本)9783030000059

Dynamic networks are ubiquitous. Detecting dynamic network changes is helpful to understand the network development trend and discover network anomalies in time. It is a research hotspot at present. The structure of the network in the real world is very complex, the current feature learning method is difficult to capture a variety of network connectivity patterns, and the definition of efficient network features requires a large number of neighborhood knowledge and computational costs. In order to overcome this limitation, this paper presents a method of dynamic network change detection using network embedding, which automates the whole process by using feature extraction as a embedding problem, and carries out dynamic network change detection by analyzing the distribution of nodes in space after network embedding processing. We use this method to simulate dynamic network and real dynamic network datasets to prove the validity of this method. © Springer Nature Switzerland AG 2018.

关键词： Network embeddings

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Achieving Efficient Alkaline Hydrogen Evolution Reaction on Long-Range Ni Sites in Ru Clusters-Immobilized Ni3n Array Catalyst

SSRN

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SSRN 2022年

作者： Gao, Xiaorui Zang, Wenjie Li, Xin Qian, Bin Zheng, Lirong Kou, Zongkui School of Electronic and Information Engineering Changshu Institute of Technology Changshu 215500 China Department of Materials Science and Engineering University of California-Irvine IrvineCA92697 United States School of Physical & Mathematical Sciences Nanyang Technological University 637371 Singapore Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Hydrogen (H2) production from alkaline water electrocatalysis is economically appealing yet significantly hindered by the sluggish H2O adsorption and H* binding kinetics on active sites during hydrogen evolution reaction (HER). Herein, we interfacially immobilize Ru clusters on the hierarchical nickel nitride (Ru-Ni3N) nanosheet arrays via the filling of Ru3+ species into the metal vacancies of nickel hydroxide precursors and the subsequent controllable nitridation. The optimized Ru-Ni3N shows the outstanding HER performance, affording a 30-fold rise in the intrinsic activity of Ni sites, a outperforming-Pt/C overpotential at ≥125 mA cm-2 while remaining a robust stability. We further establish by a combined study of density functional theory (DFT) calculations with experimental analyses that long-range Ni sites around Ru sites act as active sites via the electron delocalization, remarkably weakening the H2O adsorption and H* binding barriers for enhancing the alkaline HER kinetics. Moreover, it also demonstrates an excellent pH-universal HER and overall water splitting performance. © 2022, The Authors. All rights reserved.

关键词： Electrocatalysts

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Truth discovery on categorical multi-valued attributes with source relations 4

Truth discovery on categorical multi-valued attributes with ...

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4th IEEE International Conference on Computer and Communications, ICCC 2018

作者： Zheng, Yan Luo, Junyong Yin, Meijuan Yang, Wen China State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

ISBN: (纸本)9781538683392

In the era of big data, a mass of data fusion applications need to obtain accurate and complete attribute information about various objects. Most existing truth discovery methods are for single-valued attributes, which will be invalid for multi-valued attributes. They are usually based on the assumption that the data sources are independent of each other. It is not in line with the reality that related relationship occurs between them. Since multi-valued attributes are at large discrete, this paper proposes a truth discovery method incorporating the qulity and the correlations of data sources, namely Categorical Multi-Truths Finder algorithm (CMTF), which iteratively derives the accuracy and the recall rate of data source along with the truth set for each attribute. The experimental results show that CMTF outperforms the state-of-the-art. © 2018 IEEE.

关键词： Data fusion

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HHL Analysis and Simulation Verification Based on Origin Quantum Platform

引用

Journal of Physics: Conference Series 2021年第1期2113卷

作者： Xiaonan Liu Lina Jing Lin Han Jie Gao State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou 450001 China Henan Supercomputing Center Zhengzhou University Zhengzhou 450001 China

Solving large-scale linear equations is of great significance in many engineering fields, such as weather forecasting and bioengineering. The classical computer solves the linear equations, no matter adopting the elimination method or Kramer's rule, the time required for solving is in a polynomial relationship with the scale of the equation system. With the advent of the era of big data, the integration of transistors is getting higher and higher. When the size of transistors is close to the order of electron diameter, quantum tunneling will occur, and Moore's Law will not be followed. Therefore, the traditional computing model will not be able to meet the demand. In this paper, through an in-depth study of the classic HHL algorithm, a small-scale quantum circuit model is proposed to solve a 2×2 linear equations, and the circuit diagram and programming are used to simulate and verify on the Origin Quantum Platform. The fidelity under different parameter values reaches more than 90%. For the case where the matrix to be solved is a sparse matrix, the quantum algorithm has an exponential speed improvement over the best known classical algorithm.

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A binary translation backend registers allocation algorithm based on priority 5th

A binary translation backend registers allocation algorithm ...

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5th International Conference on Geo-Spatial Knowledge and Intelligence, GSKI 2017

作者： Wang, Jun Pang, Jianmin Fu, Liguo Shan, Zheng Yue, Feng Zhang, Jiahao State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou450001 China

ISBN: (纸本)9789811308956

As most binary translation systems don’t consider the difference of register requirements of basic blocks, which brings redundant memory access instructions caused by unnecessary registers overflow. To solve this problem, a binary translation backend registers allocation algorithm based on priority (BTBRAP) is proposed. Firstly, local global register is allocated statically to reduce the global register maintenance overhead, according to the statistical features of registers on the source platform. Then, the number of every register requested in basic blocks is determined, according to the relationship between intermediate representation and the source platform registers. So the priority of registers allocation is obtained. Conclusively, allocate the registers dynamically based on the priority to reduce the registers overflow. As the test results of nbench, representative recursive programs and SPEC2006 show, the algorithm effectively reduces the redundant memory access of local code, and improves the program performance with an average increase of 7.94%. © Springer Nature Singapore Pte Ltd. 2018.

关键词： Software testing

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A Novel Timing-based Network Covert Channel Detection Method

A Novel Timing-based Network Covert Channel Detection Method

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2019 International Conference on Artificial Intelligence Technologies and Applications, ICAITA 2019

作者： Lu, Shoupu Chen, Zhifeng Fu, Guangxin Li, Qingbao State Key Laboratory of Mathematical Engineering and Advanced Computing Henan Province Zhengzhou450001 China Henan University of Economics and Law Henan Province Zhengzhou450000 China P.O.Box 5111 Beijing China

Network stealth events are endless, and covert timing channel is one of the most difficult means to prevent. In order to further improve the detection rate of covert timing channel, several typical network covert timing channel construction algorithms are analyzed. On the basis of the above analysis, a detection method based on IPDs multidimensional features was proposed in this paper. IPDs of covert timing channels from three dimensions: shape, change rule and data statistics are analyzed. Respectively, polarization feature, autocorrelation feature, clustering feature are proposed, and the three features are unified into a model. The threshold method is used to determine whether the channel to be detected is a normal channel. Experiments show that the method can detect the existing covert timing channel with less time cost and compared with the traditional detection method has a certain rate of improvement. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Timing circuits

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The attack surface shifting in the mimic defense system 4

The attack surface shifting in the mimic defense system

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4th IEEE International Conference on Computer and Communications, ICCC 2018

作者： Wang, Liqun Zhang, Zheng Li, Weichao Liu, Hao MEAC State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

ISBN: (纸本)9781538683392

The notion of attack surface shifting is introduced to describe the situation of shifting the attack surface in the moving target defense system. However, the situation of shifting the attack surface in the mimic defense system is different from the situation of shifting the attack surface in the moving target defense system. Hence, the existing notion of attack surface shifting can't be applied to describe the situation of shifting the attack surface in mimic defense system. In this paper, we redefine the notion of attack surface shifting for the mimic defense system, and provide a formal method for quantifying the shifting. Experimental results reveal that the new notion of attack surface shifting contributes to improve the strategy of scheduling the heterogeneous redundant executive entity so as to enhance the security of mimic defense system. © 2018 IEEE.

关键词： Formal methods

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Topological refraction in dual-band valley sonic crystals

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Physical Review B 2021年第14期103卷 144309-144309页

作者： Ding Jia Yong Ge Haoran Xue Shou-qi Yuan Hong-xiang Sun Yihao Yang Xiao-jun Liu Baile Zhang Research Center of Fluid Machinery Engineering and Technology School of Physics and Electronic Engineering School of Computer Science and Communication Engineering Jiangsu University Zhenjiang 212013 China Key Laboratory of Modern Acoustics National Laboratory of Solid State Microstructures Department of Physics and Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation College of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China Centre for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore

Valley pseudospins, as quantum states of energy extrema in momentum space, have been introduced from condensed-matter systems into classical sound systems, and several valley sonic crystals (VSCs) have been realized experimentally. However, in the existing VSCs, topological kink states generally appear in a single band gap, which apparently has become an obstacle for multiband topological sound devices. To overcome this challenge, we here experimentally demonstrate dual-band VSCs, in which robust valley kink states exist in two separated bulk band gaps. More interestingly, two opposite valleys separately located in two band gaps are locked to a single propagation direction, which arises from the fact that the bands below two band gaps show opposite valley Chern numbers at the K/K′ valley. This double valley-locking phenomenon has been demonstrated via measuring the topological refraction of the kink states into the ambient space at a zigzag termination. We observe positive refraction at the lower band gap, whereas the coexistence of positive and negative refraction at the higher band gap. Additionally, we observe the robust valley transport through the sharp corners at two band gaps. The designed VSCs with the dual-band topological refraction and robust valley transport could find potential applications in multiband and multidirectional devices.

关键词： Acoustic wave phenomena Acoustics Band gap Geometric & topological phases Valleytronics

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Secure Intelligent Reflecting Surface Aided Integrated Sensing and Communication

arXiv

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arXiv 2022年

作者： Hua, Meng Wu, Qingqing Chen, Wen Dobre, Octavia A. Swindlehurst, A. Lee The State Key Laboratory of Internet of Things for Smart City University of Macau 999078 China The Department of Electronic Engineering Shanghai Institute of Advanced Communications and Data Sciences Shanghai Jiao Tong University Minhang200240 China The Faculty of Engineering and Applied Science Memorial University St. John’sNLA1B 3X5 Canada The Center for Pervasive Communications and Computing University of California at Irvine IrvineCA92697 United States

In this paper, an intelligent reflecting surface (IRS) is leveraged to enhance the physical layer security of an integrated sensing and communication (ISAC) system in which the IRS is deployed to not only assist the downlink communication for multiple users, but also create a virtual line-of-sight (LoS) link for target sensing. In particular, we consider a challenging scenario where the target may be a suspicious eavesdropper that potentially intercepts the communication-user information transmitted by the base station (BS). To ensure the sensing quality while preventing the eavesdropping, dedicated sensing signals are transmitted by the BS. We investigate the joint design of the phase shifts at the IRS and the communication as well as radar beamformers at the BS to maximize the sensing beampattern gain towards the target, subject to the maximum information leakage to the eavesdropping target and the minimum signal-to-interference-plus-noise ratio (SINR) required by users. Based on the availability of perfect channel state information (CSI) of all involved user links and the accurate target location at the BS, two scenarios are considered and two different optimization algorithms are proposed. For the ideal scenario where the CSI of the user links and the target location are perfectly known at the BS, a penalty-based algorithm is proposed to obtain a high-quality solution. In particular, the beamformers are obtained with a semi-closed-form solution using Lagrange duality and the IRS phase shifts are solved for in closed form by applying the majorization-minimization (MM) method. On the other hand, for the more practical scenario where the CSI is imperfect and the target location is uncertain, a robust algorithm based on the S-procedure and sign-definiteness approaches is proposed. Simulation results demonstrate the effectiveness of the proposed scheme in achieving a trade-off between the communication quality and the sensing quality, and also show the tremendous pot

关键词： Channel state information

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