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arXiv 2024年

作者： Kang, Zheng Wu, Mei Feng, Yiyu Li, Jiahao Zhang, Jieming Tian, Haiyi Wang, Ancheng Wu, Yunkai Wang, Xu College of Big Data and Information Engineering Guizhou University Guizhou Guiyang550025 China Department of Mathematics The Chinese University of Hong Kong 999077 Hong Kong Key Laboratory of Advanced Manufacturing Technology Ministry of Education Guizhou Guiyang550025 China

In light of recent advancements in energy technology, there is an urgent need for lead-free barium titanate (BTO) -based materials that exhibit remarkable ferroelectric and photoelectric properties. Notwithstanding the considerable experimental advances, a theoretical understanding from the electron and atomic perspectives remains elusive. This study employs the generalized gradient approximation plane wave pseudopotential technique to investigate the structural, electronic, ferroelectric, and optical properties of (Zn, Co) co-doped BaTiO3 (BZCT) based on density functional theory. The objective is to ascertain the extent of performance enhancement and the underlying mechanism of (Zn, Co) co-doping on barium titanate. Our findings reveal that the incorporation of (Zn, Co) into the BaTiO3 lattice significantly augments the tetragonality of the unit cell. Moreover, the ferroelectric properties are enhanced, with a spontaneous polarization that is stronger than that observed in pure BTO, exhibiting excellent ferroelectricity. The results of the Hubbard+U algorithm indicate that the band gap of BZCT is reduced. Concurrently, the enhanced ferroelectric polarization increases the built-in electric field of the material, facilitating the separation of photogenerated carriers and improving optical absorption. Consequently, the optical absorption ability and photorefractive ability are effectively enhanced. BZCT, with its high spontaneous polarization and outstanding optical properties, can serve as a promising candidate material in the fields of energy storage and photovoltaics. © 2024, CC BY-NC-ND.

关键词： Ferroelectricity

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Software for data acquisition AMC module with PCI Express interface

Software for data acquisition AMC module with PCI Express in...

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International conference on Mixed Design of Integrated Circuits and Systems (MIXDES)

作者： Sergiusz Szachowalow Grzegorz Jablonski Dariusz Makowski Lukasz Butkowski Waldemar Koprek Stefan Simrock Department of Microelectronics and Computer Science Technical University of Lodz Lodz Poland Institute of Electronic Systems Warsaw University of Technology Warsaw Poland Deutsches Electronen Synchrotron DESY Hamburg Germany

Free Electron Laser in Hamburg (FLASH) and X-Ray Free Electron Laser (XFEL) are linear accelerators that require a complex and accurate Low Level Radio Frequency (LLRF) control system. Currently working systems are based on aged Versa Module Eurocard (VME) architecture. One of the alternatives for the VME bus is the Advanced Telecommunications and Computing Architecture (ATCA) standard. The ATCA based LLRF controller mainly consists of a few ATCA carrier boards and several Advanced Mezzanine Cards (AMC). AMC modules are available in variety of functions such as: ADC, DAC, data storage, data links and even CPU cards. This paper focuses on the software that allows user to collect and plot the data from commercially available TAMC900 board.

关键词： data acquisition X-ray lasers Free electron lasers Telecommunication control Computer architecture Linear accelerators Radio frequency optical control Radio control Control systems

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Novel comparative torsional analytical technique to predict mechanical reliability of emerging memory cards and packages

Novel comparative torsional analytical technique to predict ...

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Electronics Packaging technology conference (EPTC)

作者： Jason Wong Hu Guo Jun Leow Chiap Yong Spencer Chew Cookson Electronics Semiconductor Products Singapore

Torsional test is a method widely used to determine the behaviour of materials when subjected to torsional force. Packaged devices ranging from memory modules to cards are subjected to this test to predict its mechanical lifetime reliability. It is however, a challenge to predict an optimum torsion testing condition for new emerging packaged devices, with different package configurations. This paper explores a novel technique to accurately predict the maximum torsional force of various new memory card packages such as micro-secure digital (mu-SD) card profiles and other emerging card types with different die, material and substrate constructions. This technique involves extrapolating torsional results gathered through subjecting various memory packages with known constructions, as well as data correlation of torsional results using various optical and chemical analysis techniques. This facilitates the recommendation of optimum material properties such as mold filler content, as well as the design rules for package construction and material properties of memory cards or packages, to cater for better mechanical reliability. With a novel torsion test setup, a torsional force is applied to different types of memory packages, the authors were able to extrapolate the results from a chart plotting maximum applied torque versus volume of package. Together with chemical and optical characterization tests, we can accurately predict the optimum muSD card torsional force requirements. In addition, results of memory packages with different geometry and criteria to meet torsion test are shared. Results relating to mold compound properties such as flexural storage modulus, which is strongly influenced by filler composition and resin chemistries, contribute to meet torsion test requirements

关键词： Packaging Material properties Materials testing Life testing Building materials optical materials Chemical analysis Materials reliability Torque Geometrical optics

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Three-Dimensional Terahertz Metasurfaces for Ultrafast All-optical Logic Operations with Temporal Properties

Three-Dimensional Terahertz Metasurfaces for Ultrafast All-O...

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IEEE International conference on Plasma Science (ICOPS)

作者： H. Yuan J. Liang Air Force Engineering University Air Defense and missile Defense Academy Shaanxi Xi’an China

ISBN: (数字)9798350360912

ISBN: (纸本)9798350360929

Terahertz metadevices play a crucial role in driving major breakthroughs in terahertz technology, especially in the fields of communications, sensor, and computing [1–5] . However, in order to realize multifunction integration of the current terahertz metadevice, the inevitable introduction of complex excitation mechanism leads to large volume design and the information computing and processing capacity has not been greatly improved. In order to overcome these problems, in this paper a three-dimensional simple terahertz metasurface for three-bit logic operations triggered by a single excitation field is proposed. By introducing an active material silicon layer combined with an anisotropic metal structure, a twodimensional active terahertz metasurface has been realized under optically pumped excitation. In addition, due to the relaxation characteristics of the silicon photoactive layer, the metasurface reintroduces the time dimension to realize the three-dimensional active terahertz metasurface. Therefore, two kinds of three-bit logic gates “AND” and “NAND” are obtained from the metasurface in two wide bands by utilizing the optical pumping strength, polarization characteristic and time-varying characteristic. This work may promote the miniaturization, excitation simplicity and functional diversification of current computing integrated devices, paving the way for further improvement of terahertz computing, data storage and information processing capabilities in the future.

关键词： Plasma properties optical polarization Terahertz materials Metasurfaces Silicon optical pumping optical materials

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Synthesis, Kinetics and Electrochemical Properties of a New Photochromic Diarylethene

Synthesis, Kinetics and Electrochemical Properties of a New ...

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2011 International conference on Advanced Materials and Computer Science(ICAMCS 2011)

作者： Shouzhi Pu Renjie Wang Hongying Xia Gang Liu Jiangxi Key Laboratory of Organic Chemistry Jiangxi Science and Technology Normal University

A new unsymmetrical photochromic diarylethene [1-(2-methyl-5-(3-methoxyphenyl)-3-thienyl), 2-(2-methyl-3-benzothienyl)] perfluorocyclopentene(1a), was synthesized, and its photochromic properties such as photochromism, kinetics and electrochemical properties were investigated in detail. The results showed that the compound exhibited excellent photochromism both in solution and in PMMA film with alternating irradiation by UV/Vis light. The kinetic and electrochemical experiments indicated that the cyclization/cycloreversion process of the compound was determined to be the zeroth/first order reaction, and the electrochemcial switching property can be potential use for electrochemistry data storage. At last, using this dithienylethene as recording medium was performed successfully.

关键词： Diarylethene Photochromism Electrochemical optical storage

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Ledger technology of Blockchain and its Impact on Operational Performance of Banks: A Review

Ledger Technology of Blockchain and its Impact on Operationa...

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IEEE conference on Innovative Technologies in Intelligent Systems and Industrial Applications (CITISIA)

作者： Teja Goud Allam A B M Mehedi Hasan Angelika Maag P.W.C. Prasad Study Group Australia Australian Institute of Higher Education Australia Western Sydney University Australia

ISBN: (纸本)9781665417853

The distributed ledger technology eliminates third party providers from the transaction system to enhance strength and store information using digital storage techniques. In this research paper, we incorporate distributed ledger technology and Blockchain for secure financial transactions. This technology protectively transfers information and solves other issues. It carries an extra investigation process in a smart logistic area to enhance the overall system. This research paper follows some steps to generate an infrastructure that contains four major elements. These are - input, analysis, evolution, and output. It is also useful to implement a peer-to-peer networking approach in digital currency modules. It helps to transfer currency from one account to another with more stability and security. Here researchers also provide bitcoin techniques for the international market using Blockchain and distributed ledger technology. It is applicable for the KYC system and data management. In this paper, we provide a detailed literature review on this topic and generate an evolution table. This research paper’s verification table contains the frequency of each component selected from previously published research papers. The discussion part of the paper provides a helpful approach to manage transformation data using private as well as public Blockchain.

关键词： Distributed ledger optical fiber networks Stability analysis Blockchains Peer-to-peer computing Internet Security

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Human Action Recognition using Local Spatio-Temporal Discriminant Embedding

Human Action Recognition using Local Spatio-Temporal Discrim...

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26th IEEE conference on Computer Vision and Pattern Recognition (CVPR 2008), vol.10

作者： Kui Jia Dit-Yan Yeung Shenzhen Institute of Advanced Integration Technology CAS/CUHK Shenzhen China Hong Kong University of Science and Technology Hong Kong China

Human action video sequences can be considered as nonlinear dynamic shape manifolds in the space of image frames. In this paper, we address learning and classifying human actions on embedded low-dimensional manifolds. We propose a novel manifold embedding method, called Local Spatio-Temporal Discriminant Embedding (LSTDE). The discriminating capabilities of the proposed method are two-fold: (1) for local spatial discrimination, LSTDE projects data points (silhouette-based image frames of human action sequences) in a local neighborhood into the embedding space where data points of the same action class are close while those of different classes are far apart;(2) in such a local neighborhood, each data point has an associated short video segment, which forms a local temporal subspace on the embedded manifold. LSTDE finds an optimal embedding which maximizes the principal angles between those temporal subspaces associated with data points of different classes. Benefiting from the joint spatio-temporal discriminant embedding, our method is potentially more powerful for classifying human actions with similar space-time shapes, and is able to perform recognition on a frame-by-frame or short video segment basis. Experimental results demonstrate that our method can accurately recognize human actions, and can improve the recognition performance over some representative manifold embedding methods, especially on highly confusing human action types.

关键词： Humans Shape Space technology Video sequences Learning systems Information analysis Computer vision optical computing Image recognition Content addressable storage

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On measurement accuracy of lubricant thicknesses on sliders by ellipsometry

On measurement accuracy of lubricant thicknesses on sliders ...

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Asia-Pacific Magnetic Recording conference (APMRC)

作者： J. M. Zhao M.S. Zhang M.C. Yang Data Storage Institute Agency for Science Technology and Research Singapore

Transferred lubricant will affect IIMS and deteriorate flying stability, causing overall system reliability issues. Therefore, it is necessary to accurately determine the transferred lubricant thicknesses on sliders. Because the slider optical constants - vary with the measured spot, the measurement accuracy is a critical concern for ellipsometry application in measuring lubricant thicknesses on sliders. This paper investigates the measurement accuracy of lubricant thicknesses on sliders based on uncertainty propagation analysis and experimental studies. The results reveal that elliopsometry can't work out the correct lubricant thicknesses on slider.

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Manifesto of edge ICT fabric

Manifesto of edge ICT fabric

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International conference on Intelligence in Next Generation Networks (ICIN)

作者： A. Manzalini R. Minerva E. Kaempfer F. Callegari A. Campi W. Cerroni Noel Crespi E. Dekel Y. Tock W. Tavernier K. Casier S. Verbrugge D. Colle R. Vilalta R. Muñoz R. Casellas R. Martínez Nicola Mazzocca Elisa Maini Innovative Architectures Telecom Italia - Strategy - Future Centre Turin Italy IBM Research - Haifa Haifa Israel Universita di Bologna Bologna Emilia-Romagna IT Communications and Storage Infrastructure Group Intel Corporation Phoenix United States Department of Information Technology (INTEC) Ghent University-iMinds Belgium Department of Electrical Electronic and Information Engineering “G. Marconi” and CIRI-ICT University of Bologna Bologna Italy Optical Networks and Systems Department Centre Tecnològic de Telecomunicacions de Catalunya (CTTC) Castelldefels Spain Telecom SudParis Institut Mines-Telecom Paris France Department of Electrical Engineering and Information Technology University of Naples Naples Italy

technology advances are making available huge amounts of processing, storage, networking capabilities at the edge (i.e., up to End-Users premises) of current networks. It is argued that these trends, coupled with new emerging paradigms such as Software Defined Networks, will impact deeply the evolution of future networks, allowing to design highly flexible architectures at the edge capable of creating a galaxy of new ICT business opportunities. This paper presents this vision by proposing a so-called “manifesto of Edge ICT Fabric”: the sheer number of nodes, devices and systems being deployed at the edge, up to Users' premises, will create an ICT fabric offering an enormous processing and storage power. Using this Edge ICT fabric, which is closer to the Users, for executing network functions and services will bring several advantages, both in term of improved performance and cost savings (e.g., determined by the removal of middle-boxes). It is argued that incentives, cooperation and competition at the edge will boost the long-term value of networks: like in ecosystems, where evolution select the winning species, winning services will succeed, grow, and promote further investments, while losing ideas will fade away.

关键词： Computer architecture Fabrics Hardware Distributed databases Telecommunications Standards Virtualization

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Nanofabrication of sub-wavelength size aperture array for near field optical probe array

Nanofabrication of sub-wavelength size aperture array for ne...

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IEEE conference on Nanotechnology

作者： J.T. Ok S.S. Choi D.W. Kim C.K. Chun J.W. Kim J.H. Boo Department of Physics Research Center for Nanoscience and Technology Sunmoon University Ansan Chungcheongnam South Korea Department of Mechanical Engineering Sunmoon University Ansan Chungcheongnam South Korea Department of nanoscience & Technology Sungkyunkwan University Suwon Gyeonggi South Korea

Recently there have been tremendous interests about near field optical lithographic techniques for the next generation gigabyte information storage devices. The near field optical lithographic technique will circumvent the classical diffraction limit and can provide the sub-wavelength size patterns less than 100 nm and the parallel data processing has been examined. Therefore, several parallel processing techniques such as multi-cantilever array and the nano-size aperture array have been previously reported. In this work, the nano-fabrication technique for the sub-wavelength size aperture array is presented. Initially, the (50/spl times/50) dot array was patterned on the SiO/sub 2/ thermally grown on Si (100) substrate. Each dot has (5/spl times/5) /spl mu/m/sup 2/ pattern size. The anisotropic TMAH etching of the Si substrate was performed and followed by anisotropic stress-dependent thermal oxidation at 1000/spl deg/C and backside Si etching using TMAH solution. The opening of the nano-size aperture on the oxide pyramid array was carried out using water-diluted (50:1) HF solution. The uniformity of the (50/spl times/50) nano-size aperture array was examined carefully on the four corners of the array patterns. The average diameter of the aperture was -260 nm and its deviation was found to be /spl sim/10%. The optical characterization for the oxide pyramidal array was performed and its diffraction pattern was revealed. In addition, the 50 nm thick Al thin film for the near field probe was deposited and the result of its characterization is reported.

关键词： optical arrays Nanofabrication Apertures Probes optical films optical diffraction Substrates Anisotropic magnetoresistance Etching optical devices

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