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Biochemical performance of new cardiovascular needles

Journal of Long-Term Effects of Medical Implants 2001年第1-2期11卷 55-63页

作者： Thacker, John G. Ferguson Jr., Robert E. H. Rodeheaver, George T. Edlich, Richard F. Department of Mechanical and Aerospace Engineering University of Virginia Charlottesville VA United States Department of Plastic Surgery University of Virginia School of Medicine Box 800376 Charlottesville VA 22908 United States Plastic Surgery Research Program University of Virginia Health System P.O. Box 801351 Charlottesville VA 22908-1351 United States Trauma Specialists LLP Legacy Emanuel Hospital 22500 NE 128th Circle Brush Prairie WA 98606 United States

Cardiovascular needles are now being manufactured from new stainless steel alloys containing high concentrations of nickel, Surgalloy™ and Ethalloy™. The purpose of this study was to compare the biomechanical performance of a cardiovascular needle made of Surgalloy with a comparably sized needle made of Ethalloy. The parameters of biomechanical performance included sharpness, maintenance of sharpness, resistance to bending, and ductility. Because the biomechanical performance of these needles was remarkably similar, cardiovascular needles made of either the Surgalloy or Ethalloy alloys are recommended for cardiovascular surgery.

关键词： Cardiovascular system

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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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Determination of Mung Bean Seed Viability Change in Vacuum Packaging during Storage in Different Temperatures

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IOP Conference Series: Materials Science and engineering 2019年第1期557卷

作者： M. Faisal U. Ahmad D. Wulandani Postharvest Technology Master Course Program Graduate School Bogor Agricultural University Indonesia Dept. of Mechanical and Bio-system Engineering IPB Bogor Agricultural University Indonesia

Mung bean seeds decreased their viability very fast during storage, especially in tropical area without proper packaging. The purpose of this study is to observethe decrease in viability of mung bean seeds during storage and to build a mathematical model for shelf life prediction. Dried mung bean seeds were vacuum packed and stored in Accelerated Shelf-life Testing chamber at five different temperatures of 30° C, 35° C, 40° C, 45° C, 50° C with approximately 80% in relative humidity, to facilitate rapid deterioration with different rate of physical and chemical change in the seed. The results show that there was an increase in moisture content and the germination decreased in different rates. Changes in values for some parametersof the seeds affected the viabilty of the seeds during rapid deterioration. The value of constant (k)for viability decreasing was calculated and used to build the mathematical model for predicting the shelf life of mung bean seeds during storage at any temperature. Using the developed model, it was observed that the shelf life of the Sriti variety of mung bean seeds in vacuum packaging could maintain 90% of germination level for 421 days or 14.3 months if stored at 20 °C, and for 173.37 days or 5.78 months if stored at 25 °C.

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Continuous Prediction of Leg Kinematics during Walking using Inertial Sensors, Smart Glasses, and Embedded Computing

Continuous Prediction of Leg Kinematics during Walking using...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Oleksii Tsepa Roman Burakov Brokoslaw Laschowski Alex Mihailidis Department of Computer Science AGE-WELL Networks of Centres of Excellence program University of Toronto and the Vector Institute for Artificial Intelligence Department of Mathematical Methods of System Analysis Igor Sikorsky Kyiv Polytechnic Institute Kyiv Ukraine Department of Computer Science University of Toronto Toronto ON Canada Department of Mathematics National University of Kyiv-Mohyla Academy Kyiv Ukraine Department of Mechanical and Industrial Engineering University of Toronto Toronto ON Canada Toronto Rehabilitation Institute University Health Network Toronto ON Canada Institute of Biomedical Engineering University of Toronto Toronto ON Canada

Unlike traditional hierarchical controllers for robotic leg prostheses and exoskeletons, continuous systems could allow persons with mobility impairments to walk more naturally in real-world environments without requiring high-level switching between locomotion modes. To support these next-generation controllers, we developed a new system called KIFNet (Kinematics and Image Fusing Network) that uses lightweight and efficient deep learning models to continuously predict the leg kinematics during walking. We tested different sensor fusion methods to combine kinematics data from inertial sensors and computer vision data from smart glasses and found that adaptive instance normalization achieved the lowest RMSE predictions for knee and ankle joint kinematics. We also deployed our model on an embedded device. Without inference optimization, our model was 20 times faster than the previous state-of-the-art and achieved 20% higher prediction accuracies, and during some locomotor activities like stair descent, decreased RMSE up to 300%. With inference optimization, our best model achieved 125 FPS on an NVIDIA Jetson Nano. These results demonstrate the potential to build fast and accurate deep learning models for continuous prediction of leg kinematics during walking based on sensor fusion and embedded computing, therein providing a foundation for real-time continuous controllers for robotic leg prostheses and exoskeletons.

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MEASURES OF EFFECTIVENESS AS APPLIED TO MAINTENANCE PRACTICES

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NAVAL ENGINEERS JOURNAL 1992年第4期104卷 101-102页

作者： JACOBS, KS ELFONT, M PROCACCINO, V Mark Elfont Ph.D:. is head of the Engineering Analysis Staff at the Naval Ship Systems Engineering Station (NAVSSES). At NAVSSES Dr. Elfont developed the Ships Machinery Analysis and Reporting Technique (SMART) System that utilizes direct access to the Ships 3-M database to calculate the fleet performance of HM&E systems. The SMART process is an automated approach to performance trending and offers the in-service engineers and life cycle managers cost effective information on the performance of equipments and systems in the actual fleet environment. Prior to coming to NAVSSES Dr. Elfont was at the Naval Air Development Center (NADC) for 18 years with most of his service as program manager for various avionic weapon system developments. Dr. Elfont also spent three years as the business manager of a private telecommunication firm. Vincent Procaccino:is the measures of effectiveness coordinator within the Performance and Business Indicators Section of the Equipment Assessment and Alteration Department Naval Ship System Engineering Station (NAVSSES). Mr. Procaccino is responsible for developing processes and techniques for determining the effectiveness of condition assessment efforts primarily the Assessment of Equipment Condition (AEC) program. NAVSSES is the Navy's in service engineering agent for HM&E equipment and is currently pursuing several programs which are in the process of evaluating condition assessment of HM&E systems. The efforts include continuous on-line monitors and expert system applications. Prior to arriving at NAVSSES in December 1988 Mr. Procaccino received a bachelor of science degree in mechanical engineering from Penn State University in August of 1987. He then worked as a project engineer for a small manufacturing firm until his arrival at NAVSSES.

Recent developments in surface ship maintenance strategies have been advanced on the promise of achieving reduced maintenance costs and improving the availability of shipboard systems. Included in the melange of proposed solutions are the Phased Maintenance Concept, Condition Based Maintenance, Expert system Diagnostics, as well as many other variations of these notions. As programs are initiated to evaluate prototype systems, or in some cases install production units, it is crucial that effective measurement procedures be instituted to determine to what extent the respective program goals and objectives are achieved. This paper explores various data sources that offer potential application to evaluation of advanced maintenance concept effectiveness. Also examined are data analysis and reporting techniques to clearly identify the benefits gained from those activities. The authors feel that it is important that the process of effectiveness evaluation, while remaining an objective process, become a part of the maintenance process itself. Maximum use of existing databases and in-place data collection procedures is advocated.

关键词： Naval Vessels

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COMBAT system MAINTENANCE CENTRAL (CSMC)

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NAVAL ENGINEERS JOURNAL 1994年第1期106卷 47-53页

作者： SACKETT, WH DORMAN, ML Colonel William H. Sackett:served over 30 years in the United States Marine Corps earning during his career a BS degree in mechanical engineering through a transitory combination of university studies and military schools. During the period June 1976 to December 1988 he participated as a principal member of the RCA AEGIS Ship Combat System Readiness Development Team. His activities included the conduct of feasibility studies and the identification of physical characteristics in the development of a combat system readiness concept for implementation in the Combat System Maintenance Central of the AEGIS ship. Marshall L. Dorman Jr.:received his BS degree in mechanical engineering from the University of Washington in 1959. He worked at the Boeing Company in Seattle on various airplane/missile programs and the Navy's PHM hydrofoil program. He was employed by RCA on the Aegis program from June 1976 until February 1988 as a lead engineer in arrangements for the Aegis CG 47 class cruisers the CGN-42 proposal and the strike cruiser proposal. For efforts in this position he received the Aegis Excellence Award. Following the Aegis program he returned to Boeing and was employed in system engineering as a configurator on the Navy E-6 AW ACS and the F22 advanced tactical fighter programs. Marshall a life member of ASNE the Naval Institute and the Navy League was a qualified engineering duty officer in the Naval Reserve and served several training duty tours with NavSea in Washington DC. He is also a registered professional engineer in Washington State and was a registered professional engineer while at RCA in New Jersey.

Combat system maintenance central (CSMC) is an innovative manned space concept. New to the Navy, it is proving to be a major asset to the AEGIS cruisers and destroyers. ''The primary mission of the CSMC is to provide an organized environment for the coordination and control of operability testing and maintenance, and the collection, evaluation, and timely dissemination of combat system operational readiness information. CSMC grew from a minimal size, ''broom closet'' concept (see Figure 1) to one of a critically manned operating area. The growth and evolution of the concept was a major challenge. Several iterations were subjected to intensive design reviews until the CSMC concept was finally fully approved by the Navy (see Figure 2). Combat system contractor personnel working closely with NavSea PMS 400, Aegis program office, personnel were responsible for the development of the CSMC. The space was configured to meet and has met all operational requirements imposed.

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AIR-CUSHION LANDING CRAFT NAVIGATION

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NAVAL ENGINEERS JOURNAL 1985年第4期97卷 248-260页

作者： GRAHAM, HR KIM, JC BAND, EGU FOWLER, AW Herbert R. Graham:received his degrees of B.S. in 1951 and M.S. in 1958 in aeronautical engineering from the Massachusetts Institute of Technology and the California Institute of Technology respectively. He also attended the Harvard Graduate School of Business Administration. He is presently a task manager at TRW Inc. McLean Virginia responsible for landing craft air cushion (LCAC) engineering support. Since joining TRW in 1967 he has had several technical project management and system engineering responsibilities in amphibious ships transportation and energy. He was responsible for the preliminary engineering design and cost estimates for tracked air cushion vehicles (TACVs). He has been active in several professional societies including ASNE and served as vice-chairman Los Angeles Section American Institute of Aeronautics and Astronautics. John C. Kim:received his degrees of B.S. in electrical engineering Tri-State University 1959 M.S. in electrical engineering Michigan State University 1960 and Ph.D. in electrical engineering Michigan State University. He is presently a senior staff engineer with TRW Inc. McLean Virginia where his technical experience has included communications system engineering and navigation system analysis. Since joining TRW in 1969 he has held numerous positions including section head project manager and department manager. His previous employment includes E-Systems/Melpar Division and Honeywell. Dr. Kim has been active in the IEEE Washington Chapter activities which included secretary vice-chairman and chairman of Systems Science and Cybernetics Group. Edward G.U. Band:received a B.S. degree in mechnical engineering in 1946 and a D.I.C in aeronautical engineering in 1947 at the City and Guilds College of London University. In 1951 he received an M.S. degree from Stevens Institute of Technology in fluid dynamics. After a career in the aircraft industry in England Canada and the U.S.A. he spent several years teaching in Chile and at Webb Institute of Naval Archi

Air cushion vehicles (ACVs) have operated successfully on commercial routes for about twenty years. The routes are normally quite short; the craft are equipped with radar and radio navigation aids and maintain continuous contact with their terminals. Navigation of these craft, therefore, does not present any unusual difficulty. The introduction of air cushion vehicles into military service, however, can present a very different picture, especially when external navigation aids are not available and the craft must navigate by dead reckoning. This paper considers the problems involved when navigating a high-speed air cushion vehicle by dead reckoning in conditions of poor visibility. A method is presented to assess the ACV's navigational capability under these circumstances. A figure of merit is used to determine the sensitivity of factors which affect navigation such as the range of visibility, point-to-point distance, speed, turning radius and accuracy of onboard equipment. The method provides simplistic but adequate answers and can be used effectively to compare the-capability and cost of alternative navigation concepts.

关键词： AIR CUSHION VEHICLES

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Precooling of air entering an air-conditioner condenser by cooling water from an open-pond via an inline or staggered tube bank heat exchanger

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AIP Conference Proceedings 2024年第1期3236卷

作者： Viza Heang Attakorn Asanakham Tanongkiat Kiatsiriroat Energy Engineering Program Department of Mechanical Engineering Faculty of Engineering and Graduate School Chiang Mai University 239 Huay Kaew Road Muang District Chiang Mai 50200 Thailand Thermal System Research Laboratory Department of Mechanical Engineering Faculty of Engineering Chiang Mai University 239 Huay Kaew Road Muang District Chiang Mai 50200 Thailand

Precooling air entering a 2TR 134a air-conditioner condenser under a Chiang Mai climate via an inline or staggered tube bank heat exchanger to enhance the unit’s cooling performance was theoretically investigated. The cooling water was sourced from a 5 m x 5 m x 1 m open pond, with various ratios of surface area to depth (A/D) between 15 to 25, and an initial temperature of 23 °C at 8 a.m. In the context of office buildings, an A/D ratio of 25 with a 25 m3 water volume was identified as the minimum appropriate value since on the following morning, the pond’s temperature could potentially revert to its level from the prior day after serving as a heat sink during the daytime in April, which is the hottest month. The tube bank heat exchangers had a tube diameter of 15.88 mm. For each configuration, there were four rows in the flow direction, totaling 164, 136, and 104 tubes, with longitudinal and transversal pitch ratios set at 1.25, 1.5, and 2, respectively. The daily average electrical power savings of the air-conditioner was found to be 18.69%, 13.69%, and 8.53%, respectively, for the staggered tube bank configuration and 18.2%, 12.48%, and 7.11%, respectively, for the inline design.

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Size selection of an inline tube bank heat exchanger with an electric field for air cooling of an air-conditioner condenser

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AIP Conference Proceedings 2024年第1期3236卷

作者： Ekuong Tang Tanongkiat Kiatsiriroat Attakorn Asanakham Energy Engineering Program Department of Mechanical Engineering Faculty of Engineering and Graduate School Chiang Mai University 239 Huay Kaew Road Muang District Chiang Mai 50200 Thailand Thermal System Research Laboratory Department of Mechanical Engineering Faculty of Engineering Chiang Mai University 239 Huay Kaew Road Muang District Chiang Mai 50200 Thailand

Air precooling before entering the condenser of an air-conditioner increases the cooling performance of the unit. A better heat transfer coefficient could lower the temperature of air leaving a heat exchanger, resulting in a higher COP for a refrigeration cycle. In this study, an electrohydrodynamic (EHD) technique for heat transfer enhancement of air flowing in a square inline tube bank under laminar forced convection was investigated. The tube bank had 10 rows with 155 mm diameter tubes with air flowing normal to the tubes. The pitch ratios of the center-to-center spacing between tubes and tube diameter ST/D=SL/D were set at 2, 3 and 4. High DC voltage pulses, between 7-17 kV, were supplied to a set of wires installed at the center of the square tubes and tube bank served as electrodes with positive and negative polarities, respectively. The tube bank surface temperature was set at 30 °C, while the inlet air temperature was varied between 40-50°C. It was found that smaller pitch ratios yielded lower outlet air temperatures. Additionally, with an electric field, a better heat transfer coefficient was obtained. Then, the outlet air temperature could be further reduced. At an inlet air temperature of 40 °C, with a tube bank having ST/D=SL/D=3.0 and an entering air velocity of 0.2 m/s, when the outlet air temperature was not set to a value greater than 32 °C, the number of tube columns was only 2 for a 16.5 kV supplied voltage compared with 10 for the tube bank with no electric field. This means that 80% of the total area could be reduced using an appropriate EHD voltage.

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Wind tunnel testing of JSAE standard Low-aerodynamic-drag vehicle body using 1/5 scale model

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Review of Automotive engineering 2009年第1期30卷 51-60页

作者： Shimano, Kenjiro Kumano, Takahiro Takagi, Michitoshi Ono, Kenji Horinouchi, Nariaki Tarumi, Seiji Department of Mechanical Systems Engineering Faculty of Engineering Musashi Institute of Technology 1-28-1 Tamazutsumi Setagaya Tokyo 158-8557 Japan Layout Group Automobile Platform Design Department Suzuki Motor Corporation 300 Takatsuka-cho Minami-ku Hamamatsu-shi Shizuoka 432-8611 Japan Department of Prime Mover Engineering School of Engineering Tokai University 1117 Kitakaname Hiratsuka-shi Kanagawa 259-1292 Japan VCAD System Research Program RIKEN 2-1 Hirosawa Wako Saitama 351-0198 Japan Heat Transfer and Fluid Flow Laboratory Toyota Central R and D Labs. Inc. Nagakute Aichi 480-1192 Japan CAE Testing Division Yamaha Motor Co. Ltd. 2500 Shingai Iwata-shi Shizuoka 438-8501 Japan

As computational fluid dynamics plays a crucial role in vehicle body design, the CFD committee, one of the technical committees comprising JSAE, embarked on a benchmark project in which a number of CFD codes would be tested on the same vehicle body. A wind tunnel test of the 1/5 scale model was conducted to provide reference data for the benchmark test. In this paper, details of the measurements are presented. On the body surface, smooth flow patterns were visualised by tufting. It was also found that total pressure loss in the wake of the model displayed a unique pattern similar to a mushroom cloud. © 2009 Society of Automotive Engineers of Japan, Inc. All rights reserved.

关键词： Computational fluid dynamics

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