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arXiv 2020年

作者： Jakobs, F. Ostler, T.A. Lambert, C.-H. Yang, Y. Salahuddin, S. Wilson, R.B. Gorchon, J. Bokor, J. Atxitia, U. Dahlem Center for Complex Quantum Systems and Fachbereich Physik Freie Universität Berlin Berlin14195 Germany LiégeB-4000 Belgium College of Business Technology and Engineering Sheffield Hallam University Howard Street SheffieldS1 1WB United Kingdom Department of Electrical Engineering and Computer Sciences University of California BerkeleyCA94720 United States Department of Materials Science and Engineering University of California BerkeleyCA94720 United States Lawrence Berkeley National Laboratory 1 Cyclotron Road BerkeleyCA94720 United States Department of Mechanical Engineering and Materials Science and Engineering Program University of California RiversideCA92521 United States ETH Zurich Hönggerbergring 64 Zürich8093 Switzerland Portland Technology Development Department Intel Corp. HillsboroOR97006 United States Universite de Lorraine CNRS IJL NancyF-54000 France

Many questions are still open regarding the physical mechanisms behind the magnetic switching in GdFeCo alloys by single optical pulses. Phenomenological models suggest a femtosecond scale exchange relaxation between sublattice magnetization as the driving mechanism for switching. The recent observation of thermally induced switching in GdFeCo by using both several picosecond optical laser pulse as well as electric current pulses has questioned this previous understanding. This has raised the question of whether or not the same switching mechanics are acting at the femoand picosecond scales. In this work, we aim at filling this gap in the understanding of the switching mechanisms behind thermal single-pulse switching. To that end, we have studied experimentally thermal single-pulse switching in GdFeCo alloys, for a wide range of system parameters, such as composition, laser power and pulse duration. We provide a quantitative description of the switching dynamics using atomistic spin dynamics methods with excellent agreement between the model and our experiments across a wide range of parameters and timescales, ranging from femtoseconds to picoseconds. Furthermore, we find distinct element-specific damping parameters as a key ingredient for switching with long picosecond pulses and argue, that switching with pulse durations as long as 15 picoseconds is possible due to a low damping constant of Gd. Our findings can be easily extended to speed up dynamics in other contexts where ferrimagnetic GdFeCo alloys have been already demonstrated to show fast and energy-efficient processes, e.g. domain-wall motion in a track and spin-orbit torque switching in spintronics devices. Copyright © 2020, The Authors. All rights reserved.

关键词： Ternary alloys

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Charge and Energy Transfer Dynamics of Hybridized Exciton-Polaritons in 2D Halide Perovskites

arXiv

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arXiv 2023年

作者： Anantharaman, Surendra B. Lynch, Jason Stevens, Christopher E. Munley, Christopher Li, Chentao Hou, Jin Zhang, Hao Torma, Andrew Darlington, Thomas Coen, Francis Li, Kevin Majumdar, Arka Schuck, P. James Mohite, Aditya Harutyunyan, Hayk Hendrickson, Joshua R. Jariwala, Deep Department of Electrical and Systems Engineering University of Pennsylvania PhiladelphiaPA19104 United States KBR Inc. BeavercreekOH45431 United States Air Force Research Laboratory Sensors Directorate Wright-Patterson Air Force Base OH45433 United States Department of Physics University of Washington SeattleWA98195 United States Department of Physics Emory University AtlantaGA30322 United States Department of Chemical and Biomolecular Engineering Rice University HoustonTX77005 United States Department of Materials Science and Nanoengineering Rice University HoustonTX77005 United States Applied Physics Program Smalley‐Curl Institute Rice University HoustonTX77005 United States Department of Mechanical Engineering Columbia University New YorkNY10027 United States Department of Electrical and Computer Engineering University of Washington SeattleWA98195 United States

Excitons, bound electron-hole pairs, in Two-Dimensional Hybrid Organic Inorganic Perovskites (2D HOIPs) are capable of forming hybrid light-matter states known as exciton-polaritons (E-Ps) when the excitonic medium is confined in an optical cavity. In the case of 2D HOIPs, they can self-hybridize into E-Ps at specific thicknesses of the HOIP crystals that form a resonant optical cavity with the excitons. However, the fundamental properties of these self-hybridized E-Ps in 2D HOIPs, including their role in ultrafast energy and/or charge transfer at interfaces, remain unclear. Here, we demonstrate that > 0.5 µm thick 2D HOIP crystals on Au substrates are capable of supporting multiple-orders of self-hybridized E-P modes. These E-Ps have high Q factors (> 100) and modulate the optical dispersion for the crystal to enhance sub-gap absorption and emission. Through varying excitation energy and ultrafast measurements, we also confirm energy transfer from higher energy upper E-Ps to lower energy, lower E-Ps. Finally, we also demonstrate that E-Ps are capable of charge transport and transfer at interfaces. Our findings provide new insights into charge and energy transfer in E-Ps opening new opportunities towards their manipulation for polaritonic devices. © 2023, CC BY.

关键词： Charge transfer

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Spatial atlas of the mouse central nervous system at molecular resolution (vol 622, pg 552, 2023)

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NATURE 2024年第7993期625卷 E6-E6页

作者： Shi, Hailing He, Yichun Zhou, Yiming Huang, Jiahao Maher, Kamal Wang, Brandon Tang, Zefang Luo, Shuchen Tan, Peng Wu, Morgan Lin, Zuwan Ren, Jingyi Thapa, Yaman Tang, Xin Chan, Ken Y. Deverman, Benjamin E. Shen, Hao Liu, Albert Liu, Jia Wang, Xiao Broad Institute of MIT and Harvard Cambridge MA USA Department of Chemistry Massachusetts Institute of Technology Cambridge MA USA John A. Paulson School of Engineering and Applied Sciences Harvard University Boston MA USA Computational and Systems Biology PhD Program Massachusetts Institute of Technology Cambridge MA USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Department of Biology Massachusetts Institute of Technology Cambridge MA USA Klarman Cell Observatory Broad Institute of MIT and Harvard Cambridge MA USA Department of Chemistry and Chemical Biology Harvard University Cambridge MA USA Stanley Center for Psychiatric Research Broad Institute of MIT and Harvard Cambridge MA USA

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APPLICATION OF A GENERAL-PURPOSE CAD SYSTEM IN THE DDG-51 DESIGN PROCESS

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NAVAL ENGINEERS JOURNAL 1988年第3期100卷 265-274页

作者： AYERS, RE CALLAHAN, PJ KASSEL, B Randy E. Ayers:is a naval architect in the Computer Aided Engineering Division (Sea 507) of the Naval Sea Systems Command. He received his B.S.E. degree cum laude in structural materials and fluids engineering from the University of South Florida in 1979. Mr. Ayers began his career in the naval shipbuilding industry as a structural design engineer for the Long Beach Naval Shipyard. Currently he is the computer applications manager for the DDG-51 consultant for other ship design projects and has special responsibility for teaching CAD applications and utilization. He has received a letter of appreciation for his work on the DDG-51 ship design and has earned several superior achievement awards while involved in such projects as the battleship modernization and CIWS. Mr. Ayers has been a project leader for the LHA and FF-1052 class of ships and for a number of other ships undergoing construction. He is also an active member of ASNE. Patrick J. Callahan:is the manager of the Computer Aided Design Branch of the Computer Applications Directorate at Designers & Planners Inc. Mr. Callahan worked at General Dynamics Electric Boat Division for 10 years where he was involved in CAD detail design efforts for the SSBN-726 class and the SSN-688 class submarines. In 1984 he joined M. Rosenblatt & Son Inc. and was CAD design supervisor overseeing the operations of their CAD system. Currently managing the CAD Branch at D&P he is responsible for a variety of CAD projects such as being a key member of the DDG-51 Computer Aided Ship Design Program developing procedures and documentation for systems operation. He served as project manager for the IGES conversion of 650 FFG-7 class drawings from a McAuto to a Computervision database. Most recently he was responsible for generating the digital drawing package for the AO-177 (Jumbo) contract design. Ben Kassel:received his BSME from the University of Maine in 1981 and joined the David Taylor Research Center as a mechanical design engineer and later became the CAD/CAM system

This paper describes how the Naval Sea systems Command (NavSea) applied computer-aided design (CAD) to the DDG-51 class ship design. CAD tools and techniques are described along with a discussion on how new modes of operation, procedures, and standards are being introduced to take full advantage of CAD technology. Because geometric modeling techniques and geometric model analysis are major purposes of a CAD system they are described in detail. An explanation of how the model interfaces with other design tools is also presented. A summary of the computer applications implemented during the DDG-51 design is provided and areas which require additional consideration and future development are identified.

关键词： WARSHIPS

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WHY NOT SAILS

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NAVAL ENGINEERS JOURNAL 1978年第5期90卷 57-62页

作者： MORISSEAU, KC The author graduated from the New York State Maritime College in 1956 receiving his BS degree in Marine Engineering. He then reported to the Navy's Bureau of Ships where after 18 months training he was assigned to the Hull Mechanical Section in the Hull Design Branch. During this period he was involved in the contract design of various materials handling features of naval ships including vehicle and cargo handling for Amphibious Ships electronics equipment handling and replenishment at sea and in addition also was charged with the management and operation of the Division's computer installation. In 1964 he became the Hull Project Coordinator for the AOR 1 Class AO(J) 51 Class and the AOE 3 Class ships and after completing their contract design was transferred to the Auxiliary Type Desk and reassigned as AE 26 Class Project Engineer. From 1965 until 1974 he was the Program Manager for the FAST System and the Missile/Cargo STREAM System in the Underway Replenishment Project Office (PMS–390)/Underway Replenishment Division (SHIPS–490) and its organizational predecessors. In April 1974 when SHIPS–490 and SHIPS–427 were merged he became Head of the Underway Replenishment Improvement Branch the position he now holds in the Naval Sea Systems Command.

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One Day Smart Grid Supersession - Analytics and Integration

One Day Smart Grid Supersession - Analytics and Integration

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IEEE Power and Energy Society General Meeting

作者： W. H. Edwin Liu Stephen McArthur Jay Giri Karen Miu Rob Pratt Jun Wen Bob Uluski Luther Dow Gerard Labut Pacific Gas & Electric Company USA Bechtel Institute for Energy and Environment British Energy Advanced Diagnostics Centre University of Strathclyde UK Power Systems Technology and Strategic Initiatives ALSTOM Grid Redmond WA USA Electrical and Computer Engineering Department Drexel University USA Smart Grid Research and Development Pacific Northwest National Laboratory's (PNNL's) USA Transmission and Interconnection Planning Group Southern California Edison (SCE) Company USA EPRI's Power USA West Coast Operations Quanta Technology USA SmartCurrentssm Program Strategy DTE Energy Detroit MI USA

ISBN: (纸本)9781457710001

The effort of "Smart Grid" is to modernize grid infrastructure and build-in intelligence to power grids and delivery systems, and their interfaces to customer premises. However, the perspectives range from an emphasis on infrastructure to an emphasis on new paradigm-shifting applications. Alternatively, the smart grid can be thought of as the advanced information technologies that enable the desired analytical applications. As a general understanding, we believe that Smart Grid needs to integrate power system analysis, computing and economics to enhance grid reliability, efficiency, and security, and contributes to the climate change strategic goal. In this Supersession, the analytics that empowers smart grid applications is discussed;and the practical implementation and integration challenges will be presented.

关键词： Smart grid Analytical applications System integration Smart grids systems Integration Power system analysis computing information technology DNA Integration integration INFRASTRUCTURE

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Parallel 3D temperature image reconstruction using multi-color magnetic particle imaging (MPI)

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AIP Conference Proceedings 2024年第1期3230卷

作者： Klaus N. Quelhas Mark-Alexander Henn Ricardo Farias Weston L. Tew Solomon I. Woods National Institute of Standards and Technology (NIST) 100 Bureau Drive Gaithersburg MD USA Systems Engineering and Computer Science Program (PESC) Federal University of Rio de Janeiro Rio de Janeiro RJ Brazil College of Computer Mathematical & Natural Sciences University of Maryland 7998 Regents Dr College Park MD USA

Magnetic Particle Imaging (MPI) is a novel technique developed for remotely detecting magnetic nanoparticle (MNP) tracers, with great potential for biomedical imaging (as an alternative to traditional methods like MRI or CT), cell tracking, targeted drug delivery and magnetic hyperthermia. More recently, MPI has been studied as a potential method of non-contact temperature measurement. This work presents a simulation study of the multi-color MPI method tailored for 3D temperature imaging, discusses the feasibility of the method for 3D temperature measurements, and shows a parallel implementation of the multi-color T-MPI reconstruction algorithm in graphics processing unit (GPU). While the use of the parallel algorithm resulted in executions about 40x faster when compared to the serial implementation, the method exhibited serious limitations in accurately resolving particle temperatures between the calibration temperatures by interpolation.

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THE AEGIS DATA BUS EXPERIMENT

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NAVAL ENGINEERS JOURNAL 1989年第5期101卷 53-58页

作者： FRINK, JG VERVEN, DM John G. Frink is an assistant group supervisor in the Fleet Systems Department of The Johns Hopkins University Applied Physics Laboratory. He received his B.S. degree in physics from Michigan State University in 1968 and the M.S. degree in computer science from the University of Maryland in 1971. Mr. Frink worked at the Naval Surface Weapons Center White Oak Laboratory on a variety of weapons systems before joining the Applied Physics Laboratory in 1978. Mr. Frink has supervised the development of a large scale battle group simulation that successfully employs the receiver selection paradigm described herein on a hardware suite composed of an extensible number of (currently 15) processors. David M. Verven is a senior electrical engineer in the Fleet Systems Department of The Johns Hopkins University Applied Physics Laboratory. He received the B.S. degree in electrical engineering from the University of Maryland College Park in 1979 and the M. S. degree in the same discipline from The Johns Hopkins University in 1984. Mr. Verven joined the Applied Physics Laboratory in 1979 and initially worked on analysis of Navy sensor systems. In 1981 he was the AN/SPS-49 test team leader for the New Threat Upgrade (NTU) combat system land-based test. In 1982 he became involved in the development of the BBWRS system. Currently he is involved in real-time computer program development for the CEP project.

This paper documents an experiment performed by The Johns Hopkins University Applied Physics Laboratory to measure the effect of inserting a data bus into a combat system. The experiment was conducted at the Aegis computer Center located at the Naval Surface Weapons Center in Dahlgren, Virginia (NSWC/DL). The purpose of the experiment was to determine whether or not the Aegis Weapon System (the core of the Aegis Combat System) could be operated with a portion of its point-to-point interelement cables replaced by a data bus. The data bus chosen for the experiment employs message broadcasting with receiver selection. A primary goal of the experiment was to minimize the amount of Aegis computer program changes required to accommodate the data bus. The results presented in this paper will show that the experiment was a success. Key certification tests were passed with no computer program changes to the tactical elements and minimal changes in the Aegis tactical executive (ATES) program (less than 110 words changed).

关键词： Data Transmission Equipment

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What happened to the system perspective in reliability?

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Quality and Reliability engineering International 1992年第5期8卷 391-412页

作者： Halverson, Mark Ozdes, Demir Mark Halverson:received a BSEE from the University of Michigan in 1972 followed by an MS in Computer Information and Control System Engineering in 1973 also from the University of Michigan. Mr. Halverson has worked predominantly on military and aerospace design projects for such companies as Litton and Northrop. He is a specialist in inertial navigation and control systems. He has also worked with PLG Inc. as a risk analyst on various projects including commercial military and space applications. Since 1986 Mr. Halverson is an aerospace consultant working in Europe where he among other activities codeveloped the BRAT probabilistic risk analysis program. Demir Ozdes:received his BSEE from Purdue University in 1958 and his MSEE from the University of Arizona in 1963. He has over 35 years of experience in electronic design system engineering optimal control system design and analysis as well as in the design analysis and simulation of synergistic navigation systems. He has worked at Northrop Teledyne SPC TRW and Litton. Since 1984 he has been a private consultant in the aerospace field in Europe and is co-holder of patents as well as being a co-developer of the BRAT probabilistic risk analysis program.

This paper takes a broad overview of the reliability and safety engineering practice as it is commonly exercised in the aerospace and military industries today, especially with respect to complex electronic equipment which typically includes considerable software content. A general deficiency is noted with regard to the system-level approach to reliability. It would appear that the system-level reliability activities are given less attention than is needed, while excessive emphasis is placed on component micro- physics, component failure models, and various component-oriented analyses. systems-level reliability topics, which predominate in the equipment reliability which is actually observed, are sometimes ignored by reliability engineers. Methods and practical philosophies to re-establish a solid system engineering foundation for contemporary reliability practice, which have been developed through the authors' experience in the field, are presented. Finally, an example analysis is shown to illustrate the concepts.

关键词： Reliability

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Instruction Multi-Constraint Molecular Generation Using a Teacher-Student Large Language Model

arXiv

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arXiv 2024年

作者： Zhou, Peng Wang, Jianmin Li, Chunyan Wang, Zixu Liu, Yiping Sun, Siqi Lin, Jianxin Wei, Leyi Cai, Xibao Lai, Houtim Liu, Wei Wang, Longyue Liu, Yuansheng Zeng, Xiangxiang College of Information Science and Engineering Hunan University Changsha China The Interdisciplinary Graduate Program in Integrative Biotechnology Yonsei University Incheon21983 Korea Republic of School of Informatics Yunnan Normal University Kunming650500 China Department of Computer Science University of Tsukuba Tsukuba3058577 Japan Research Institute of Intelligent Complex Systems Fudan University Shanghai200433 China Shanghai AI Laboratory Shanghai200232 China Centre for Artificial Intelligence driven Drug Discovery Faculty of Applied Science Macao Polytechnic University China School of Informatics Xiamen University Xiamen China Tencent AI Lab China

While various models and computational tools have been proposed for structure and property analysis of molecules, generating molecules that conform to all desired structures and properties remains a challenge. Here, we introduce a multi-constraint molecular generation large language model, TSMMG, which, akin to a student, incorporates knowledge from various small models and tools, namely, the 'teachers'. To train TSMMG, we construct a large set of text-molecule pairs by extracting molecular knowledge from these 'teachers', enabling it to generate novel molecules that conform to the descriptions through various text prompts. We experimentally show that TSMMG remarkably performs in generating molecules meeting complex, natural language-described property requirements across two-, three-, and four-constraint tasks, with an average molecular validity of over 99% and success ratio of 82.58%, 68.03%, and 67.48%, respectively. The model also exhibits adaptability through zero-shot testing, creating molecules that satisfy combinations of properties that have not been encountered. It can comprehend text inputs with various language styles, extending beyond the confines of outlined prompts, as confirmed through empirical validation. Additionally, the knowledge distillation feature of TSMMG contributes to the continuous enhancement of small models, while the innovative approach to dataset construction effectively addresses the issues of data scarcity and quality, which positions TSMMG as a promising tool in the domains of drug discovery and materials science. Copyright © 2024, The Authors. All rights reserved.

关键词： Students

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