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ACQUISITION REFORM AND BEST PRODUCT PROCUREMENT - AN ENGINEERING VIEW

NAVAL ENGINEERS JOURNAL 1994年第6期106卷 41-57页

作者： FISHER, DA SKOLNICK, A He has been involved with several weapon system developments. Among these were the Trident II fire control and navigation systems the BSY-I Anti-Submarine Warfare System and the Navy standard computers (UYK44 and EMSP). He served as manager of the Digital Circuits Engineering Branch and was then appointed as manager of the Automatic Test Equipment (ATE) Technology Division. As manager of the ATE Technology Division he was responsible for the SP-23 Fire Control System Support Project the SP-24 Navigation Project and the Fleet Progressive Maintenance Program (2M/ATE). This Division was responsible for selection and application of electronic product technology and for developing fleet test and repair techniques. He holds a B.S. in Electrical Engineering from the University of Evansville and is currently pursuing a Masters of Public Administration at Indiana University-Purdue University Indianapolis. Dr. Alfred Skolnick:retired from the Navy in 1983 with the rank of captain. He is president of System Science Consultants (SSC) specializing in strategic planning technical program definition technology assessment and engineering analyses on selected matters of national interest. Dr. Skolnick taught mathematics and management sciences at University of Virginia and Marymount University. He is adjunct faculty at Northern Virginia Community College. From 1985 to 1989 he was president of the American Society of Naval Engineers. In the Navy he served at Applied Physics Laboratory/The Johns Hopkins University then aboard USSBoston(CAG-1) and played leading roles in several weapon system developments inertial navigation (Polaris) deep submergence (DSRV) and advanced ship designs (SES). He later was director Combat System Integration Naval Sea Systems Command and head Combat Projects Naval Ship Engineering Center. In 1975 he became a major project manager and led the Navy's High Energy Lasers Program in 1981 he was assigned all Navy Directed Energy Weapons development efforts. He was vice president advanced tech

The military services are being moved in the direction of performance-based specifications and standards. They are being steered against dictating ''how to'' produce an item since such action forecloses on the ability to gain access to components or technology that may have a commercial equivalent. Why should the engineering community embrace the new approach? Aside from the obvious weight of it being approved policy, therefore currently mandated, it warrants examination because it is the correct approach at this time when applied to appropriate products. Military specifications and standards are to be displaced then, by acceptable alternative contractor design solutions. Industry bidders will be allowed to propose the particular design details, permitting procurement flexibility by contractually citing only system level or interface requirements, both physical and functional. Hopefully, this can broaden the industrial base and increase competition with reduced costs to follow. Conceptually, the approach appears both performance-sensible and cost-attractive (there are, of course, consequent risks) but how does implementation proceed? Is it possible to pursue the goals envisioned along paths that are not in themselves experimental? Can the American postulate, minimal loss of life and limb to U.S. military people, continue to be honored? Experience and track record elsewhere imply encouraging possibilities in select situations-useful prospects are identified and discussed in practical terms.

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Anionic Chemistry Modulation Enabled Environmental Self-Charging Aqueous Zinc Batteries: The Case of Carbonate Ions

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Angewandte Chemie 2024年第39期136卷

作者： Guangmeng Qu Lu Wang Yongzheng Zhao Dedong Wang Xixi Zhang Bin Wang Fengbo Wang Zhongxin Jing Xijin Xu Liqiang Xu Hongfei Li Key Laboratory of Colloid and Interface Chemistry Ministry of Education School of Chemistry and Chemical Engineering Shandong University Jinan Shandong 250100 P. R. China School of Physics and Technology University of Jinan Jinan Shandong 250022 P. R. China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen Guangdong 518055 China

Anionic chemistry modulation represents a promising avenue to enhance the electrochemical performance and unlock versatile applications in cutting-edge energy storage devices. Herein, we propose a methodology that involves anionic chemistry of carbonate anions to tailor the electrochemical oxidation-reduction reactions of bismuth (Bi) electrodes, where the conversion energy barrier for Bi (0) to Bi (III) has been significantly reduced, endowing anionic full batteries with enhanced electrochemical kinetics and chemical self-charging property. The elaborately designed batteries with an air-switch demonstrate rapid self-recharging capabilities, recovering over 80 % of the electrochemical full charging capacity within a remarkably short timeframe of 1 hour and achieving a cumulative self-charging capacity of 5 Ah g −1 . The aqueous self-charging battery strategy induced by carbonate anion, as proposed in this study, holds the potential for extending to various anionic systems, including seawater-based Cl − ion batteries. This work offers a universal framework for advancing next-generation multi-functional power sources.

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SI-YOLO: A Deep Learning Algorithm Suitable for Surgical Instrument Detection

SSRN

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SSRN 2022年

作者： Liu, Zhenzhong Zhou, Yifan Sun, Qiyuan Wang, Yan Polat, Kemal Nour, Majid Alenezi, Fayadh Alhudhaif, Adi Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China Tianjin300384 China Department of Electrical and Electronics Engineering Bolu Abant Izzet Baysal University Bolu14280 Turkey Department of Electrical and Computer Engineering Faculty of Engineering King Abdulaziz University Jeddah21589 Saudi Arabia Department of Electrical Engineering College of Engineering Jouf University 72238 Saudi Arabia Department of Computer Science College of Computer Engineering and Sciences in Al-kharj Prince Sattam bin Abdulaziz University P.O. Box 151 Al-Kharj 11942 Saudi Arabia

Surgical instrument detection and tracking is one of the core technologies of surgical robots, which can assist clinicians in completing operations. However, existing methods need further improvement in terms of real-time performance and accuracy. We propose a deep learning algorithm, SI-YOLO, for detection of surgical instruments. SimAM attention mechanism is used to improve the feature extraction ability of YOLOv5. Replacing PANet with BiFPN in the neck network improves the feature fusion strategy. The α-IoU loss function is used to improve the regression accuracy of detection boxes. The mAP and FPS of the SI-YOLO reach 99.2% and 120 frames/sec, respectively. Aiming at the problem of ID transformation in the disappearance and occlusion of surgical instruments, the Inception-ResNet-v2 structure is added on the basis of the appearance feature extraction network Cosine of the DeepSort tracking algorithm. Combining SI-YOLO with the improved DeepSort implements the Tracking by Detection (TBD) algorithm. In the case of device disappearance or occlusion, the frequency of ID transitions is reduced by approximately 30%. Finally, we built a simulated surgery experimental platform, established our own data set, and realized the preliminary application of the proposed algorithm. © 2022, The Authors. All rights reserved.

关键词： Object detection

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Intelligent Identification of Building Patches and Assessment of Roof Greening Suitability in High-density Urban Areas:A Case Study of Chengdu

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Journal of Resources and Ecology 2022年第2期13卷 247-256页

作者： LUO Luhua CHEN Mingjie DONG Lulu SU Wei LI Xin HU Xiaodong ZHANG Xin LI Chen CHENG Weiming SHI Hanning LUO Jiancheng Faculty of Geomatics Lanzhou Jiaotong UniversityLanzhou 730070China National-Local Joint Engineering Research Center of Technological and Application for National Geographic State Monitoring Lanzhou 730070China Gansu Provincial Engineering Laboratory for National Geographic State Monitoring Lanzhou 730070China College of Geoscience and Surveying Engineering China University of Mining&Technology(Bejing)Beijing 100083China School of Earth Science and Engineering Hebei University of EngineeringHebei 056000China Tianjin University Urban Planning and Design Institute Co.Ltd Tianjin 300072China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China The ImageSky International Co.Ltd SuzhouJiangsu 215000China Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100101China School of Architecture Tianjin UniversityTianjin 300072China

With the expansion of a city,the urban green space is occupied and the urban heat island effect is *** the roof surfaces of urban buildings is an effective way to increase the area of urban green space and improve the urban ecological *** provide effective data support for urban green space planning,this paper used high-resolution images to(1)obtain accurate building spots on the map of the study area through deep learning assisted manual correction;and(2)establish an evaluation index system of roof greening including the characteristics of the roof itself,the natural environment and the human society *** weight values of attributes not related to the roof itself were calculated by Analytic Hierarchy Process(AHP).The suitable green roof locations were evaluated by spatial join,weighted superposition and other spatial analysis *** the areas within the Chengdu city’s third ring road as the study area,the results show that an accurate building pattern obtained by deep learning greatly improves the efficiency of the *** roof surfaces unsuitable for greening can be effectively classified by the method of feature extraction,with an accuracy of 86.58%.The roofs suitable for greening account for 48.08%,among which,the high-suitability roofs,medium-suitability roofs and low-suitability roofs represent 45.32%,38.95%and 15.73%.The high-suitability green buildings are mainly distributed in the first ring district and the western area outside the first ring district in *** paper is useful for solving the current problem of the more saturated high-density urban area and allowing the expansion of the urban ecological environment.

关键词： deep learning roof greening suitability assessment spatial join weighted overlay

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Annual business and news:: Beginning the 31st year of the Journal of Guidance, Control, and Dynamics

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JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 2008年第1期31卷 1-1页

作者： Schmidt, George T. Aeronautics and Astronautics Massachusetts Institute of Technology (MIT) AIAA Institute of Electrical and Electronics Engineers Russian Federation Academy of Navigation and Motion Control Department of Mechanical and Aerospace Engineering and Engineering Mechanics University of Missouri-Rolla(UMR) Lockheed Electronics Company Center for Space Research University of Texas Austin United States Wright Laboratory Eglin Air Force Base UMR AIAA Guidance Navigation and Control Technical Committee American Automatic Control Council Lockheed Martin Aeronautics Company Palmdale CA United States C4ISR and Unmanned Air Vehicle (UAV) Programs for Air Vehicle Sciences and Systems Accreditation Board Engineering and Technology Inc./Aeronautical National Technical Committee on Guidance Navigation and Control Department of Mechanical and Aerospace Engineering University at Buffalo State University of New York (SUNY) AIAA Technical Committee on GN and C Air Vehicles Directorate Air Force Research Laboratory (AFRL) Wright-Patterson Air Force Base Space Access and Hypersonic Vehicle Guidance and Control Group Control Science Center of Excellence AFRL AIAA Technical Committee on Guidance Navigation and Control Department of Mechanical and Aeronautical Engineering University of California (UC) Davis United States Boeing Company Modernized Flight Control System for the Apache Longbow AIAA Institute of Electrical and Electronics Engineers AHS Jet Propulsion Laboratory California Institute of Technology Boeing Company Flight Sciences and Advanced Design Group Guidance Navigation and Control (GN and C) Systems Engineer Distributed Space Systems NASA Goddard Space Flight Center (GSFC) AIAA GN and C Technical Committee Department of Aerospace Engineering and Engineering Mechanics University of Texas Austin United States Institute of Navigation American Astronautical Society AIAA Guidance Navigation (GN and C) and Control Technical Committee Department of Aerospace Engineering Iowa State University Iowa

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Corrigendum to “Load-bearing behaviors of sandwich plates with non-uniformly distributed grid cores: Dynamic impact and blast” [Mater. Today Commun., vol. 40, (2024), 110163]

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Materials Today Communications 2024年 41卷

作者： Youlong Wang Haixia Yang Jie Chen Quanjin Ma Yiheng Song Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education School of Civil Engineering Southeast University Nanjing 211189 PR China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen 518055 PR China School of Engineering The University of Tokyo Tokyo 113-8656 Japan

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Morphology and temporal interactions of silica particles influence the chemotherapeutic cancer cell death

Nano TransMed

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Nano TransMed 2024年 3卷

作者： Sharma, Astha Yan, Jiachen Siwakoti, Prakrit Saeed, Ayad Agarwal, Vipul Xu, Zhi Ping Wang, Ran Kumeria, Tushar School of Materials Science and Engineering University of New South Wales Kensington Sydney 2052 NSW Australia Australian Centre for Nanomedicine University of New South Wales Kensington Sydney 2052 NSW Australia Cluster for Advanced Macromolecular Design (CAMD) School of Chemical Engineering University of New South Wales Kensington Sydney 2052 NSW Australia Institute of Biomedical Health Technology and Engineering Shenzhen Bay Laboratory Shenzhen China The Australian Institute for Bioengineering and Nanotechnology The University of Queensland St Lucia Brisbane 4072 QLD Australia Institute of System and Physical Biology Shenzhen Bay Laboratory Shenzhen 518107 China Mater Research Institute – The University of Queensland Translational Research Institute Woolloongabba QLD Australia School of Pharmacy University of Queensland Woolloongabba 4102 QLD Australia

Encapsulation of drugs into nanocarriers is proven to be highly promising approach in reducing drug toxicity and enhancing therapeutic efficacy. However, controlling the loading efficiency and capacity, and release of therapeutics at specific disease site has remained a key challenge, particularly for toxic chemotherapeutic drugs. This work explored the effect of treatment with empty silica nanoparticles (SNPs) and a chemotherapeutic drug either together (i.e. co-treatment) or in tandem (i.e. temporally spaced) on the cell ablation ability of the drug. The study also investigated whether the efficacy of the drug in response to these treatments was dependent on the morphology of particles. SNPs of four different morphologies (solid: SSNPs, dendritic: DSNPs, mesoporous: MSNPs, and rod: RSNP) were used, while cisplatin (CisPt) served as model chemotherapeutic. The efficacy of CisPt as a function of SNPs morphology and temporal treatment strategy was tested in HeLa cells. The results indicated that the morphology of particles as well as treatment strategy (i.e. co-incubation and post treatment) had an impact on not only the cell viability but also the cell death pathways, as evidenced by varying IC50 values and the flow cytometry analysis. Interestingly, co-treatment of SNPs with CisPt resulted in an across-the-board lower IC50 value compared to when the cells were first treated with SNPs for 24 h followed by CisPt treatment and even when CisPt was loaded into the particles for most of the SNPs. © 2024 The Author(s)

关键词： Apoptosis Cytotoxicity Drug-resistance Necrosis Silica nanoparticles

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INTEGRATED SHIP MACHINERY systemS REVISITED

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NAVAL ENGINEERS JOURNAL 1989年第3期101卷 93-101页

作者： LEVEDAHL, WJ The author:is the assistant for technology in the Propulsion and Auxiliary Systems Department of the David Taylor Research Center (DTRC) Annapolis Md. After a World War II combat tour as a 15th AAF P-51 fighter pilot he received a B.S. in general engineering from MIT and was elected to Sigma Xi. He subsequently studied gas turbines and aeronautical engineering at ETH in Zurich and as a National Science Foundation Fellow he received his Doktor Ingenieur in applied thermodynamics at the TH Aachen Germany. He conducted basic research in combustion at the National Bureau of Standards and was head of advanced submarine reactor core design at the Knolls Atomic Power Laboratory (General Electric) during the 1950s. He then joined Combustion Engineering as chief project physicist in the design of central-station reactors. Subsequently he become manager of research at Martin Marietta involved largely in direct energy conversion for outer space. In 1970 he joined DTRC to establish the Superconductive Electric Propulsion Program and in 1974 assumed his present position. He has received the Distinguished Flying Cross and the Meritorious Civilian Service Award. Dr. Levedahl joined ASNE in 1978.

In the late 1980s, the world of U.S. Navy surface combatants is confronted with three new needs: to reduce ship signatures by factors of 10 to 1000; to provide ten-gigawatt power pulses to new combat systems; and to reduce the high cost of hull, mechanical and electrical (HM&E) systems by taking advantage of newly-available technology. These needs have caused an active response of the surface-ship community to the many apparent benefits of integrated machinery systems. The acoustic signature problem accelerated interest in integrated machinery systems. A substantial reduction in noise at cruise speeds requires the elimination of propeller cavitation and requires reductions in machinery noise. The use of contrarotating tractor propellers driven by bicoupled epicyclic gears and an alternating-current electric motor in a pod which faces directly into the flow stream is potentially capable of such performance; even better would be a contrarotating superconductive electric motor in the pod. No other concept seems even remotely competitive with these. The major reductions in installed power, fuel consumption, and reduced displacement reported in the April 1980 Naval Engineers Journal are retained. Large reductions in infrared signature and further reductions in fuel consumption are provided by intercooled recuperated gas turbines. An integrated electric propulsion system provides the opportunity to temporarily “borrow” power from the propulsion system and transform it into pulses for advanced combat systems. Not only the power of the turbines, but also the kinetic energy of the ship are available.

关键词： Ship Equipment

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Corrigendum to “Oscillation-free source term inversion of atmospheric radionuclide releases with joint model bias corrections and non-smooth competing priors” [J. Hazard. Mater. 440 (2022) 129806]

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Journal of Hazardous Materials 2023年 445卷

作者： Sheng Fang Xinwen Dong Shuhan Zhuang Zhijie Tian Tianfeng Chai Yuhan Xu Yungang Zhao Li Sheng Xuan Ye Wei Xiong Institute of Nuclear and New Energy Technology Collaborative Innovation Centre of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University Beijing 100084 China China Institute for Radiation Protection Taiyuan 030006 China NOAA Air Resources Laboratory (ARL) NOAA Center for Weather and Climate Prediction 5830 University Research Court College Park MD 20740 USA Cooperative Institute for Climate and Satellites University of Maryland College Park MD 20740 USA Key Laboratory of Beam Technology of Ministry of Education College of Nuclear Science and Technology Beijing Normal University Beijing 100875 China CTBT Beijing National Data Centre and Beijing Radionuclide Laboratory Beijing 100085 China CMA Earth System Modeling and Prediction Center (CEMC) Beijing 100081 China

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A CAPABLE, AFFORDABLE 21ST-CENTURY DESTROYER

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NAVAL ENGINEERS JOURNAL 1993年第3期105卷 213-223页

作者： LEVEDAHL, WJ The Author:is the assistant for technology in the Machinery Research and Development Dictorate of the Naval Surface Warfare Center Carderock Division Annapolis Md. After a 50-mission tour as a P-51 Mustang pilot he received a B.S. in general engineering from MIT and was elected to Sigma Xi. He subsequently studied gas turbines and aeronautical engineering at the Federal Polytechnic Institute in Zurich Switzerland and as a National Science Foundation fellow he received his Doktor Ingenieur at the Technical University of Aachen Germany. He conducted basic research in combustion at the National Bureau of Standards and was head of advanced core design at the Knolls Atomic Power Laboratory (General Electric) during the 1950s when the currently used reactor cores were designed. He then joined Combustion Engineering as chief project physicist in the design of central-station reactors. Subsequently he became manager of research at Martin Marietta involved largely in direct energy conversion for outer space. In 1970 he joined the Annapolis Laboratory to establish the Superconductive Electric Propulsion Program and in 1974 assumed his present position. He has received the Distinguished Flying Cross the Meritorious Civilian Service Award 10 patents and is the author of many technical papers.

A simple tumblehome hull of 4500LT lightship displacement carries 1200LT of military payload 6000NMi at 20kts with inherently-low acoustic, infrared, and radar signatures, and with superior seakeeping, without seawater ballast. Its two intercooled, recuperated turbines replace the seven simple-cycle engines of a comparably-armed conventional destroyer and consume 59% less fuel;both ships share a 30kt sustained speed at 80% power. Use of stern flaps permits carrving more fuel;range is doubled to 12,000 NMi. Two removable, prealigned and pretested steerable propulsor modules are attached to the stern after construction and are pierside replaceable without drydocking;each includes a steerable pod aligned to the water inflow. Contrarotating tractor propellers are driven by a pretested integrated capsule which comprises seals, thrust bearings, contrarotating ringring bicoupled epicyclic gears, and an alternating-current electric motor. A streamlined strut connects each pod rigidlv to a vertical steerable barrel which contains the individually-replaceable propulsor auxiliaries. Two power modules are removable and are mounted in the helicopter hangar. Each module comprises a 26,400 HP intercooled regenerated gas turbine, a 3 Mw ship-service generator, and a propulsion generator with a second high-voltage winding for electrothermal guns.

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