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Corrosion behaviour of PEEK or β-TCP-impregnated Ti6Al4V SLM structures targeting biomedical applications

Transactions of Nonferrous Metals Society of China 2019年第12期29卷 2523-2533页

作者： M.M.COSTA T.A.DANTAS F.BARTOLOMEU N.ALVES F.S.SILVA G.MIRANDA F.TOPTAN Center for Micro Electro Mechanical Systems(CMEMS) University of Minho(UMinho)4800-058 GuimarãesPortugal MIT Portugal Program School of EngineeringUniversity of MinhoGuimarãesPortugal Centre for Rapid and Sustainable Product Development Polytechnic Institute of Leiria Rua General Norton de MatosApartado 4133LeiriaPortugal IBTN/Br–Brazilian Branch of the Institute of Biomaterials Tribocorrosion and NanomedicineUNESPCampus de BauruAv.Eng.Luiz Edmundo Carrijo Coube14-0117033-360BauruSPBrazil

Ti6Al4V cellular structures were produced by selective laser melting(SLM)and then filled either with beta-tricalcium phosphate(β-TCP)or PEEK(poly-ether-ether-ketone)through powder metallurgy techniques,to improve osteoconductivity and wear *** corrosion behavior of these structures was explored considering its importance for the long-term performance of *** revealed that the incorporation of open cellular pores induced higher electrochemical kinetics when being compared with dense *** impregnation ofβ-TCP and PEEK led to the creation of voids or gaps between the metallic matrix and the impregnated material which also influenced the corrosion behavior of the cellular structures.

关键词： Ti6Al4V cellular structures corrosion multimaterial design poly-ether-ether-ketone(PEEK) beta-tricalcium phosphate(β-TCP)

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Stress analysis during micro-coil deployment in membranous model of saccular aneurysm with bleb

Stress analysis during micro-coil deployment in membranous m...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Carlos R. Tercero Masahiro Kojima Seiichi Ikeda Katsutoshi Ooe Toshio Fukuda Fumihito Arai Makoto Negoro Ikuo Takahashi Guiryong Kwon Global COE program for Research of Micro-Nano Mechatronics University of Nagoya Nagoya Japan Department of Mechanical Engineering University of Nagoya Nagoya Japan Department of Neurosurgery Fujita Health University Toyoake Japan Department of Neurosurgery Anjo Kosei Hospital Anjo Japan Product Development Division Terumo Clinical Supply Company Limited Kakamigahara Gifu Japan

For the development of medical micro-robotics and robotic manipulation of catheter it is necessary to ensure tissue integrity. In-vitro evaluation of tissue manipulation can be achieved using photoelastic stress analysis and vasculature modeling with photoelastic materials. In this research we propose epoxy resin as photoelastic material for vasculature modeling as it has a larger photoelastic coefficient than previously studied materials and it has a young modulus similar to human vasculature. A model of a saccular aneurysm with bleb was built with the purpose of measuring stress overshoots that enable to differentiate embolization techniques according to the respect for tissue integrity. During embolization using a coil with smaller size than the aneurysm dome diameter, an average area of 0.72 mm 2 with stress above 90 kPa was measured. This area increased to 0.77 mm 2 when the dome was touched with the release mechanism of the coil, and to 0.74 mm 2 for embolization with larger size coil. The presented modeling material and measurement technique is useful for tissue respect quantification for micro-mechanisms evaluation.

关键词： Stress Aneurysm Embolization Coils Materials Stress measurement Wires

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Configuration and coordination of activities within a supply chain: Exploring the synergy between modularity and information technology

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International Journal of Automotive Technology and Management 2006年第1期6卷 6-19页

作者： Kim, Ki-Chan Sohn, Changsoo Roemer, Thomas Yassine, Ali Department of Business Administration Catholic University of Korea Yeouido Post Office 35-1 Yeouido-dong Yeongdeoungpo-gu Seoul 150-010 Korea Republic of Manufacturing Program A. P. Sloan School of Management Massachusetts Institute of Technology Cambridge MA 02139-4307 United States Product Development Research Laboratory University of Illinois at Urbana-Champaign Urbana IL 61801 United States Department of Business Administration Catholic University of Korea Seoul Korea Republic of Sloan School MIT United States Department of General Engineering University of Illinois Urbana-Champaign United States Product Development Research Lab. Japan Catholic University of Korea Korea Republic of

This research studies the impact of information technology-enabled coordination on product modularisation in the automotive industry. A structural equation model is tested based on 177 responses to questionnaires from 177 Korean first-tier automotive suppliers. The results provide support for the hypothesis that high quality of exchanged information enables better supply chain coordination, which in turn supports product modularisation. Copyright © 2006 Inderscience Enterprises Ltd.

关键词： Automotive industry

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INTERCOMPARTMENTAL FLUID SHIFTS IN HEMODIALYSIS-PATIENTS

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BIOTECHNOLOGY PROGRESS 1987年第2期3卷 69-73页

作者： HEINEKEN, FG EVANS, MC KEEN, ML GOTCH, FA COBE Laboratories Inc. Lakewood Colorado Fred G. Heineken is currently Program Director for Biotechnology within the Emerging Engineering Technologies Division of the Engineering Directorate of the National Science Foundation. He received his B.Sc. degree in Chemical Engineering from Northwestern University and his Ph.D. degree in the same discipline from the University of Minnesota. His work experience includes fermentation research at Monsanto teaching and research in respiration physiology at the University of Colorado and hemodialysis product design and evaluation at COBE Laboratories. Hemodialysis Treatment and Research Center Franklin Hospital Ralph K. Davis Medical Center San Francisco California Mary C. Evans has a BS degree in Chemistry from the University of Florida. She has held positions in the artificial kidney development group at Dow Chemical Company and the new product development group of Cordis-Dow Corporation. She is currently working in clinical research in the Hemodialysis Treatment & Research Center at Franklin Hospital in San Francisco. Marcia Keen is currently a doctoral student at the University of California San Francisco and serves as Clinical Research Supervisor at the Hemodialysis Treatment & Research Center at Franklin Hospital in San Francisco. She received her MS at the University of California San Francisco. Her thesis research developed a non-invasive Doppler technique to quantitate vascular access graft flow in hemodialysis patients. Her research interests include physiologic responses to dialysis therapy manipulations. Frank Gotch is an Associate Clinical Professor of Medicine at the University of California San Francisco. He received his BA and MD from the University of California and is currently Medical Director of the Hemodialysis Treatment & Research Center at Franklin Hospital in San Francisco. His research has addressed such issues as adequacy of dialysis and mathematical modeling of hemodialysis and associated therapies. He is a past president of the American

Hemodialysis is a therapeutic procedure for replacing some functions of the natural kidney. As such, it is capable of allowing people with little or no residual kidney function to survive and in some cases to lead productive lives. There are, unfortunately, a number of side effects associated with this procedure (shock, muscle cramps, fatigue, etc.). In order to minimize these side effects, we have undertaken to model shifts of fluid between the intracellular and extracellular fluid spaces in hemodialysis patients. Fluid shifts are primarily a function of osmolality differences between these fluid spaces. Changes in osmolality are caused mainly by changes in urea and salt concentrations. Least squares analysis of patient data has been used to estimate the appropriate ultrafiltration and urea mass transfer coefficients for each patient. The model has then been used to find a dialysate sodium concentration profile that will minimize fluid shifts into and out of the intracellular fluid space.

关键词： BIOMEDICAL EQUIPMENT

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ADVANCED-CYCLE GAS-TURBINES FOR NAVAL SHIP PROPULSION

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NAVAL ENGINEERS JOURNAL 1984年第3期96卷 262-271页

作者： BOWEN, TL GROGHAN, DA Thomas L. Bowen began his career at the David W. Taylor Naval Ship Research and Development Center in 1969 by enrolling in the Cooperative Education Program at the Annapolis laboratory. He earned a Bachelor of Science degree in chemical engineering in 1973 at West Virginia Institute of Technology. Daniel A. Groghan:received a Bachelor of Science degree in mechanical engineering from West Virginia Institute of Technology in 1966 and later did graduate work at the George Washington University and the University of Maryland. He came to the Naval Ship Systems Command in June 1966 and began working in the Internal Combustion and Gas Turbine Engines Branch. He worked on development of the Orenda OT-4 recuperated gas turbine and marinization of the Garrett 831 gas turbine. He was also project engineer responsible for fleet installations and product improvements on the Solar Saturn gas turbines Boeing gas turbines American Locomotive diesels Electro-Motive diesels and Ruston Pax-man diesels. In 1976 he became head of the Engines Research and Development Branch where he was responsible for such programs as development of hot section gas turbine materials improved gas turbine inlets Pratt and Whitney FT9 gas turbine General Electric LM2500 Condition Monitor and initiation of the RACER program. In 1982 he became the Program Manager for propulsion systems development where he is responsible for developments on the DDG-51 AOE-6 and initiation of the recuperated cruise gas turbine.

Investigations are currently being conducted by the Navy and several contractors to determine the technical feasibility and cost effectiveness of advanced regenerative or intercooled-regenerative gas turbines as a naval propulsion engine for future mid-size surface combatants. A comparison of the performance characteristics of these engines indicates that significant increases in the thermal efficiency above current simple-cycle engines will result by adding heat exchangers for regeneration alone or with intercooling. Design and performance characteristics of several advanced-cycle gas turbines are described which utilize turbomachinery from various existing simple-cycle gas turbines. Estimates of the weight and volume of recuperators and intercoolers for these conceptual engines are provided. The nominal part-load fuel consumption trends of the simple-cycle and the advanced-cycle engines are used to compare annual fuel usage of typical ships with various combinations of propulsion engines. The relative impacts of the advanced-cycle gas turbine on propulsion machinery spaces are compared with other energy efficient prime movers using the simple-cycle gas turbine as the baseline. Commercial applications for an advanced-cycle gas turbine are surveyed according to output power and market sector. This paper presents an overview of current results and discusses the technology areas which require additional investigation.

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Synthesis and thermal stabilizing effect on polyvinyl chloride of calcium/zinc carboxylate from palm fatty acid distillate: Effect of metal to fatty acid ratio

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AIP Conference Proceedings 2024年第1期3073卷

作者： I. Dewa Gede Arsa Putrawan Nadya Amalia Pratiwi Nento Adli Azharuddin Antonius Indarto Dendy Adityawarman Chemical Engineering Product Design and Development Research Group Institut Teknologi Bandung Indonesia Master Program in Chemical Engineering Institut Teknologi Bandung Indonesia Chemical Reaction Technology and Catalysis Research Group Institut Teknologi Bandung Indonesia Chemical Engineering Process Design and Development Research Group Institut Teknologi Bandung Indonesia

Polyvinyl chloride (PVC) has many applications in construction, such as pipes, floors, roofs, walls, frames, and cables. Since it is easily degraded by heat, a heat stabilizer must be added to the PVC resin before it is molded into final products. Mixed calcium/zinc carboxylate has become a popular PVC thermal stabilizer since it is more friendly than the conventional lead base thermal stabilizers and is relatively inexpensive. This research aims to investigate the synthesis and assess the effectiveness of a mixed calcium/zinc thermal stabilizer in stabilizing PVC. The stabilizer was prepared from palm fatty acid distillate (PFAD), and different metal salt-to-fatty acid molar ratios were employed for the study. The synthesis was carried out by a metathesis method at 10% deficiency, stoichiometric, and 10% excess of metal salt-to-fatty acid molar ratio. The stabilizing effects of the obtained metal carboxylates as mixed metal thermal stabilizers have also been evaluated by standard thermal stability tests. The calcium and zinc carboxylates prepared at a 10% deficiency were found to have high pHs and lower metal contents than those at stoichiometric molar ratios due to the presence of residual sodium soap. Their thermal stabilizing effects on PVC are also worst when prepared at a deficient metal salt-to-fatty acid molar ratio. Increasing the metal-to-fatty acid molar ratio above the stoichiometric requirement lowers the thermal stabilizing effect of zinc carboxylate but has little influence on the thermal stabilizing effect of calcium carboxylate obtained. Synthesis at stoichiometric metal salt-to-fatty acid molar ratios is recommended for preparing calcium and zinc carboxylates as mixed metal PVC thermal stabilizers.

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Applying fuzzy functions and sequential coordination to optimization of machinery arrangement and pipe routing

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NAVAL ENGINEERS JOURNAL 1998年第6期110卷 43-54页

作者： Wu, BC Young, GS Schmidt, W Choppella, K Dr. Bi-Chu Wu:received a PhD in Mechanical Engineering from the University of Maryland College Park in 1991. She has worked on projects involving naval architecture design optimization solid mechanics and database development. Presently a senwr engineer with Angle Incorporated Dr Wu's research interests are in design optimization and fuzzy logic applications. Dr. Gin-Shu Young: a senior engineer with Angle Incorporated holds a PhD in Mechanical Engineering from the University of Maryland College Park. As a guest researcher with National Institute of Standards and Technologies from 1990 to 1993 he worked on vision-based navigation for autonomous vehicles. His experience also includes applications of optimization fuzzy logic neural network and genetic algorithm methods to engineering system design Mr. William Schmidt:co-founded Angle Incorporated in 1990 and has served as Vice PresidentlChiefScientist during this tame. He holds a B.Sc. in Applied Science from the Naval Acadt?my and an M.Sc. in Physics from the Naval Post Graduate School. He has cner 20 years experience in technical leadership material and personnel management. He has led the application of computer aided design (CAD) and Product Model Information Exchange to the shipbuilding industry. His experience also includes leading the amlication of model based operational analysis to support the Live Fire Test Program for DDG 51 Class Destroyers. Mr. Krishna M. Choppella:is a Sofware Engineer at Eidea Laboratories Incotporated where he works on componentbased distributed enterpvise frameworks. He has been involved in creating data analysis tools for the US Nay by integrating CAD modeis databases and graphical front ends. His work in the Masters degree program in Mechanical Engineering at the University of Texas at Austin was in di0ddase.r spectroscopy of combustion products in porous-matri burners. He received his Bachelors degree in Electrical Engineering in India. He was a Research Associate at the Centre for Laser Technology and Project Engi

Ship design is often multidisciplinary involving several design elements with various types of objectives and constraints (O/C) some easily described as mathematical formulas, others better modeled as descriptive assertions. This paper describes a method based on fuzzy functions and an integrated performance index to model O/C using descriptive assertions to be used with mathematical formulas in optimization. Another issue addressed in this paper concerns the coordination of design elements when sequentially coupled, that is, when one leads the other and the performance of the follower depends greatly on the design of the leader. Based on neuro-fuzzy techniques, the method described here coordinates and optimizes sequentially coupled elements. The two methods are applied to machinery arrangement (MA) and pipe routing (PR). Preliminary models for optimization of MA and PR are described considering convenience, producibility: engine room size, interference and location as factors in the O/C set. Some test results from MA/PR applications are presented and discussed. The methods are generic and can be extended to other elements in ship design. They are mutually independent and may be used separately Two advantages of their use are an improvement in overall performance and a reduction in the need for redesign of elements.

关键词： Optimization

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Mission Results from FORMOSAT-3/COSMIC Constellation System

Mission Results from FORMOSAT-3/COSMIC Constellation System

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AIAA Space 2007 Conference

作者： Fong, Chen-Joe Huang, Cheng-Yung Chu, Vicky Hsiao, Albert Yang, Eddy Yen, Nick Chen, Shao-Shing Hawes, Dean Kuo, Ying-Hwa Liou, Yuei-An Chi, Sen Hsin-Chu 300 Taiwan Orbital Sciences Corporation 21839 Atlantic Blvd Dulles VA 20166 United States University Corporation for Atmospheric Research Boulder CO 80307 United States Chung-Li 320 Taiwan Hsinchu 300 Taiwan Yuan Ze University Chungli 320 Taiwan FORMOSAT-3 Program Office F8 No 9 Prosperity 1st Road AIAA Department of Photonics Institute of Electro-Optical Engineering NCTU Science Development Office F8 No 9 Prosperity 1st Road FORMOSAT-3 Mission Operation Team F8 No 9 Prosperity 1st Road Flight Dynamic Facility FORMOSAT-3 Mission Operation Team F8 No 9 Prosperity 1st Road FORMOSAT-3 Program Office F8 No 9 Prosperity 1st Road Hsin-Chu 300 Taiwan F8 No 9 Prosperity 1st Road FORMOSAT-3 Spacecraft Program MicroStar Product Line Orbital Sciences Corporation 21839 Atlantic Blvd Dulles VA 20166 COSMIC University Corporation for Atmospheric Research Boulder CO 80307 United States Center for Space and Remote Research National Central University 300 Jhongda Rd. Department of Electrical Engineering Yuan Ze University

ISBN: (纸本)1563479079

The FORMOSAT-3/COSMIC spacecraft constellation consisting of six LEO satellites is the world's first operational GPS radio occultation mission. The mission is jointly developed by Taiwan's National Space Organization (NSPO) and United States' UCAR in collaboration with NASA's Jet Propulsion Laboratory and Naval Research Laboratory for three onboard payloads including GPS Occultation Receiver (GOX), Tri-Band Beacon (TBB), and Tiny Ionospheric Photometer (TIP). The FORMOSAT-3/COSMIC mission was launched successfully from Vandenberg on April 15, 2006 into the same orbit plane of the designated 516 km circular parking orbit altitude. All six FORMOSAT-3/COSMIC satellites are maintained in the good state of health except spacecraft flight model no. 2 (FM2) having power shortage and are on their way toward the final constellation of six separate orbit planes with 30-degree separations as planned. Four out of six satellites have reached their final mission orbit of 800 km as of May 2007. The FORMOSAT-3/COSMIC has processed over 1800 good atmospheric sounding profiles per day in average which has over the number of worldwide radiosondes launched per day (∼900 mostly above the land mass). The atmospheric radio soundings data are assimilated into the Numerical Weather Prediction (NWP) models for real-time weather prediction and typhoon/hurricane forecast. The global and nation's weather prediction centers have shown significant positive impact and the forecast result will be also adapted into the nation's disaster warning and relief system once constellation deployment completed by end of year 2007. With the invention of the open loop technique by UCAR, the quality, the accuracy and the lowest penetration altitude of the RO sounding profiles are better than CHAMP data. This paper also describes the mission highlight;the constellation spacecraft system performance summary;the constellation mission operation result;and the mission science results.

关键词： Cosmic rays

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Design Evaluation and Model of Attention Demand (DEMAnD): A tool for in-vehicle information system designers

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Public Roads 2000年第3期64卷 10-14页

作者： Monk, Christopher A. Moyer, M. Joseph Hankey, Jonathan M. Dingus, Thomas A. Hanowski, Richard J. Wierwille, Walter W. Science Applications International Corp. Human-Centered Systems Team's Intelligent Transportation Systems Program Federal Highway Administration's Turner-Fairbank Highway Research Center McLean VA United States Human-Centered Systems Team FHWA's Office of Safety Research and Development Turner-Fairbank Highway Research Center Advanced Product Evaluation Group Virginia Tech Transportation Institute Blacksburg VA United States Department of Industrial and Systems Engineering Virginia Tech. Transportation Institute Blacksburg VA United States Safety and Human Factors Group Virginia Tech. Transportation Institute Blacksburg VA United States

An in-vehicle information system (IVIS) has been developed designed to evaluate the demands placed on drivers attentional resources. A behavioral model predicting the driver's interaction with the program was analyzed. A prototype software package was used to evaluate the attention demand required to operate a given IVIS. The developmental and functional aspects of the program provided information on the status of the prototype software.

关键词： Intelligent vehicle highway systems

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STRUCTURAL-ANALYSIS METHODS FOR LIGHTWEIGHT METALLIC CORRUGATED CORE SANDWICH PANELS SUBJECTED TO BLAST LOADS

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NAVAL ENGINEERS JOURNAL 1991年第4期103卷 134-136页

作者： WIERNICKI, CJ LIEM, F WOODS, GD FURIO, A WHIDDON, WD SMITH, MA PACKARD, WT Christopher J. Wiernickiis the director of the Structures and Materials Division of Designers and Planners Inc. He has over 10 years of experience in marine structural design and advanced material product development. He received a B.S. degree in civil engineering from Vanderbilt University and M.S. degrees from both George Washington University and Massachusetts Institute of Technology. He is a registered professional engineer and is a member of ASNE SNAME and SAMPE. Franz Liemis a senior structural engineer of ASTECH. He has over 18 years of experience in structural engineering. He received M.S. degrees in civil/structural engineering from Carollo Wilhelmina University in West Germany. He is a registered professional engineer. Gregory D. Woodsis the Naval Sea Systems Command's lightweight metallic structures program manager. Until recently a naval architect in the Structural Integrity Application Division he currently works in the Amphibious Auxiliary and Support Ship Branch. He received a B.S. degree in mechanical engineering from Tennessee State University with additional graduate level course work at the NavSea Institute. Anthony J. Furiois the program manager for lightweight metallic structures in the Ship Structure Division of the David Taylor Research Center. He has over 19 years of experience in ship structure research and light weight metallic development for U.S. Navy fleet applications. He received a B.S. in civil engineering from Long Island University and a M.S. in ocean engineering from Stevens Institute of Technology.

Since the early 1980s, the U.S. Navy, in conjunction with industry, has continued to develop and test innovative lightweight structural concepts with the purpose of seeking alternative replacements for conventional plate beam metallic structures. One commercially available concept currently under investigation is lightweight metallic corrugated core sandwich panels. This paper presents both elastic and plastic design methods for lightweight metallic corrugated core sandwich panels subjected to air blast loading. The equations presented in this paper, while not a complete solution to the complicated dynamic, elastic plastic phenomena of blast wave-rigid body interaction, are offered as a set of relatively simple analytical expressions that can be used in preliminary design. Because of the closed form nature of the equations the designer has the capability to quickly identify the most important parameters effecting the response of lightweight metallic corrugated core sandwich panels to air blast loads.

关键词： Shipbuilding Materials

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