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(SAM) Alloy Parts Using X-Ray CT
Research Article ISSN 2639-9466 Nanotechnology & Applications Porosity Determination and Characterization of Binder Jet Printed Structural Amorphous Metal (SAM) Alloy Parts Using X-Ray CT Amamchukwu B. Ilogebe1*, Benedict Uzochukwu2, and Amy M. Elliot3 1North Carolina A&T State University, US. *Correspondence: Amamchukwu B. Ilogebe, North Carolina A&T State University, 2Virginia State University, US. US. 3Oak Ridge National Laboratory, US. Received: 04 November 2019; Accepted: 29 November 2019 Citation: Amamchukwu B. Ilogebe, Benedict Uzochukwu, Amy M. Elliot. Porosity Determination and Characterization of Binder Jet Printed Structural Amorphous Metal (SAM) Alloy Parts Using X-Ray CT. Nano Tech Appl. 2019; 2(1): 1-6. ABSTRACT The advent of Binder jet additive manufacturing continued to a revelation in the manufacture of intricate metal parts. This technology has been utilized in medical, aerospace and automotive industries, not much has been reported in the printing of parts from amorphous metal powders, which have found numerous applications in engineering because of their special properties. In this research, special emphasis was placed on two different manufacturing methods for structural amorphous metal alloy (SAM alloy); Die compaction and Binder jet printing. Samples of SAM alloy was created from these two-manufacturing methods and were subsequently, sintered, analyzed and compared. Previous studies show that as much as up to 50% porosity could be recorded in binder jet printing [1,2]. In this regard, different techniques were used to determine the percentage porosity from both manufacturing methods. The Archimedes method was used to determine the density and percentage porosity of the parts from the two methods. Similarly, percentage porosity was also determined using different tools in computed tomography (CT) analysis. -
Special Feature on Advanced Mobile Robotics
applied sciences Editorial Special Feature on Advanced Mobile Robotics DaeEun Kim School of Electrical and Electronic Engineering, Yonsei University, Shinchon, Seoul 03722, Korea; [email protected] Received: 29 October 2019; Accepted: 31 October 2019; Published: 4 November 2019 1. Introduction Mobile robots and their applications are involved with many research fields including electrical engineering, mechanical engineering, computer science, artificial intelligence and cognitive science. Mobile robots are widely used for transportation, surveillance, inspection, interaction with human, medical system and entertainment. This Special Issue handles recent development of mobile robots and their research, and it will help find or enhance the principle of robotics and practical applications in real world. The Special Issue is intended to be a collection of multidisciplinary work in the field of mobile robotics. Various approaches and integrative contributions are introduced through this Special Issue. Motion control of mobile robots, aerial robots/vehicles, robot navigation, localization and mapping, robot vision and 3D sensing, networked robots, swarm robotics, biologically-inspired robotics, learning and adaptation in robotics, human-robot interaction and control systems for industrial robots are covered. 2. Advanced Mobile Robotics This Special Issue includes a variety of research fields related to mobile robotics. Initially, multi-agent robots or multi-robots are introduced. It covers cooperation of multi-agent robots or formation control. Trajectory planning methods and applications are listed. Robot navigations have been studied as classical robot application. Autonomous navigation examples are demonstrated. Then services robots are introduced as human-robot interaction. Furthermore, unmanned aerial vehicles (UAVs) or autonomous underwater vehicles (AUVs) are shown for autonomous navigation or map building. -
A Brief Review on Robotic Exoskeletons for Upper Extremity
botic Ro s & n A i u s t e o m Islam et al., Adv Robot Autom 2017, 6:3 c n a a Advances in Robotics t v i DOI: 10.4172/2168-9695.1000177 o d n A ISSN: 2168-9695 & Automation Research Article Open Access A Brief Review on Robotic Exoskeletons for Upper Extremity Rehabilitation to Find the Gap between Research Porotype and Commercial Type Md Rasedul Islam*, Christopher Spiewak, Mohammad Habibur Rahman and Raouf Fareh College of Engineering and Applied Science, University of Wisconsin-Milwaukee, USA Abstract The number of disabled individuals due to stroke is increasing day by day and is projected to continue increasing at an alarming rate in United States. But the current amount of health professionals in physical therapy is inadequate to provide rehabilitation to these large groups. From early 1990s, researchers have been trying to develop an easy and feasible solution to this problem and lot of assistive devices both end effector type or exoskeleton type have been developed till to date. However, only a few of them have been commercialized and are being used in rehabilitation of post-stroke patients. Making the use of exoskeletons and other devices to regain lost motor function is rare. Providing therapy to this large group is quite impossible without commercializing of exoskeleton. This has motivated the authors to make a literature review and figure the reasons out that need to be solved to bridge the gap between research prototype to commercial version. This paper covers the necessity of incorporating robotic devices in rehabilitation, a brief description of existing devices particularly upper limb exoskeletons, their hardware limitations, and control issues. -
Automatic Support Control of an Upper Body Exoskeleton — Method and Validation Using the Stuttgart Exo-Jacket
Wearable Technologies (2020), 1, e2 doi:10.1017/wtc.2020.1 RESEARCH ARTICLE Automatic support control of an upper body exoskeleton — Method and validation using the Stuttgart Exo-Jacket Raphael Singer* , Christophe Maufroy and Urs Schneider Biomechatronic Systems, Fraunhofer-Gesellschaft, Institute for Manufacturing Engineering and Automation (IPA), Stuttgart, Germany *Corresponding author. Email: [email protected] Received: 1 February 2020; Revised: 9 May 2020; Accepted: 25 May 2020 Keywords: Exoskeletons; Human-Robot Interaction; Physical Human-Robot Interactive Controllers; Industry; Control Abstract Although passive occupational exoskeletons alleviate worker physical stresses in demanding postures (e.g., overhead work), they are unsuitable in many other applications because of their lack of flexibility. Active exoskeletons that are able to dynamically adjust the delivered support are required. However, the automatic control of support provided by the exoskeleton is still a largely unsolved challenge in many applications, especially for upper limb occupational exo- skeletons, where no practical and reliable approach exists. For this type of exoskeletons, a novel support control approach for lifting and carrying activities is presented here. As an initial step towards a full-fledged automatic support control (ASC), the present article focusses on the functionality of estimating the onset of user’s demand for support. In this way, intuitive behavior should be made possible. The combination of movement and muscle activation signals of the upper limbs is expected to enable high reliability, cost efficiency, and compatibility for use in industrial applications. The functionality consists of two parts: a preprocessing—the motion interpretation—and the support detection itself. Both parts were trained with different subjects, who had to move objects. -
Molecular Nanotechnology - Wikipedia, the Free Encyclopedia
Molecular nanotechnology - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Molecular_manufacturing Molecular nanotechnology From Wikipedia, the free encyclopedia (Redirected from Molecular manufacturing) Part of the article series on Molecular nanotechnology (MNT) is the concept of Nanotechnology topics Molecular Nanotechnology engineering functional mechanical systems at the History · Implications Applications · Organizations molecular scale.[1] An equivalent definition would be Molecular assembler Popular culture · List of topics "machines at the molecular scale designed and built Mechanosynthesis Subfields and related fields atom-by-atom". This is distinct from nanoscale Nanorobotics Nanomedicine materials. Based on Richard Feynman's vision of Molecular self-assembly Grey goo miniature factories using nanomachines to build Molecular electronics K. Eric Drexler complex products (including additional Scanning probe microscopy Engines of Creation Nanolithography nanomachines), this advanced form of See also: Nanotechnology Molecular nanotechnology [2] nanotechnology (or molecular manufacturing ) Nanomaterials would make use of positionally-controlled Nanomaterials · Fullerene mechanosynthesis guided by molecular machine systems. MNT would involve combining Carbon nanotubes physical principles demonstrated by chemistry, other nanotechnologies, and the molecular Nanotube membranes machinery Fullerene chemistry Applications · Popular culture Timeline · Carbon allotropes Nanoparticles · Quantum dots Colloidal gold · Colloidal -
A Powered Exoskeleton for Complete Paraplegics
applied sciences Article A User Interface System with See-Through Display for WalkON Suit: A Powered Exoskeleton for Complete Paraplegics Hyunjin Choi 1,2,* , Byeonghun Na 1, Jangmok Lee 1 and Kyoungchul Kong 1,2 1 Angel Robotics Co. Ltd., 3 Seogangdae-gil, Mapo-gu, Seoul 04111, Korea; [email protected] (B.N.); [email protected] (J.L.); [email protected] (K.K.) 2 Department of Mechanical Engineering, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, Korea * Correspondence: [email protected] or [email protected]; Tel.: +82-70-7601-0174 Received: 18 October 2018; Accepted: 14 November 2018; Published: 19 November 2018 Abstract: In the development of powered exoskeletons for paraplegics due to complete spinal cord injury, a convenient and reliable user-interface (UI) is one of the mandatory requirements. In most of such robots, a user (i.e., the complete paraplegic wearing a powered exoskeleton) may not be able to avoid using crutches for safety reasons. As both the sensory and motor functions of the paralyzed legs are impaired, the users should frequently check the feet positions to ensure the proper ground contact. Therefore, the UI of powered exoskeletons should be designed such that it is easy to be controlled while using crutches and to monitor the operation state without any obstruction of sight. In this paper, a UI system of the WalkON Suit, a powered exoskeleton for complete paraplegics, is introduced. The proposed UI system consists of see-through display (STD) glasses and a display and tact switches installed on a crutch for the user to control motion modes and the walking speed. -
The Nanobank Database Is Available at for Free Use for Research Purposes
Forthcoming: Annals of Economics and Statistics (Annales d’Economie et Statistique), Issue 115/116, in press 2014 NBER WORKING PAPER SERIES COMMUNITYWIDE DATABASE DESIGNS FOR TRACKING INNOVATION IMPACT: COMETS, STARS AND NANOBANK Lynne G. Zucker Michael R. Darby Jason Fong Working Paper No. 17404 http://www.nber.org/papers/w17404 NATIONAL BUREAU OF ECONOMIC RESEARCH 1050 Massachusetts Avenue Cambridge, MA 02138 September 2011 Revised March 2014 The construction of Nanobank was supported under major grants from the National Science Foundation (SES- 0304727 and SES-0531146) and the University of California’s Industry-University Cooperative Research Program (PP9902, P00-04, P01-02, and P03-01). Additional support was received from the California NanoSystems Institute, Sun Microsystems, Inc., UCLA’s International Institute, and from the UCLA Anderson School’s Center for International Business Education and Research (CIBER) and the Harold Price Center for Entrepreneurial Studies. The COMETS database (also known as the Science and Technology Agents of Revolution or STARS database) is being constructed for public research use under major grants from the Ewing Marion Kauffman Foundation (2008- 0028 and 2008-0031) and the Science of Science and Innovation Policy (SciSIP) Program at the National Science Foundation (grants SES-0830983 and SES-1158907) with support from other agencies. Our colleague Jonathan Furner of the UCLA Department of Information Studies played a leading role in developing the methodology for selecting records for Nanobank. We are indebted to our scientific and policy advisors Roy Doumani, James R. Heath, Evelyn Hu, Carlo Montemagno, Roger Noll, and Fraser Stoddart, and to our research team, especially Amarita Natt, Hsing-Hau Chen, Robert Liu, Hongyan Ma, Emre Uyar, and Stephanie Hwang Der. -
Potential Applications and Human Biosafety of Nanomaterials Used in Nanomedicine
HHS Public Access Author manuscript Author ManuscriptAuthor Manuscript Author J Appl Toxicol Manuscript Author . Author manuscript; Manuscript Author available in PMC 2019 May 09. Published in final edited form as: J Appl Toxicol. 2018 January ; 38(1): 3–24. doi:10.1002/jat.3476. Potential applications and human biosafety of nanomaterials used in nanomedicine Hong Sua,†, Yafei Wanga,†, Yuanliang Gua,†, Linda Bowmanb, Jinshun Zhaoa,b,*, and Min Dingb,* aDepartment of Preventative Medicine, Zhejiang Provincial Key Laboratory of Pathological and Physiological Technology, School of Medicine, Ningbo University, 818 Fenghua Road, Ningbo, Zhejiang Province 315211, People’s Republic of China bToxicology and Molecular Biology Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV, 26505, USA Abstract With the rapid development of nanotechnology, potential applications of nanomaterials in medicine have been widely researched in recent years. Nanomaterials themselves can be used as image agents or therapeutic drugs, and for drug and gene delivery, biological devices, nanoelectronic biosensors or molecular nanotechnology. As the composition, morphology, chemical properties, implant sites as well as potential applications become more and more complex, human biosafety of nanomaterials for clinical use has become a major concern. If nanoparticles accumulate in the human body or interact with the body molecules or chemical components, health risks may also occur. Accordingly, the unique chemical -
Model Characteristics and Properties of Nanorobots in the Bloodstream Michael Makoto Zimmer
Florida State University Libraries Electronic Theses, Treatises and Dissertations The Graduate School 2005 Model Characteristics and Properties of Nanorobots in the Bloodstream Michael Makoto Zimmer Follow this and additional works at the FSU Digital Library. For more information, please contact [email protected] THE FLORIDA STATE UNIVERSITY FAMU-FSU COLLEGE OF ENGINEERING MODEL CHARACTERISTICS AND PROPERTIES OF NANOROBOTS IN THE BLOODSTREAM By MICHAEL MAKOTO ZIMMER A Thesis submitted to the Department of Industrial and Manufacturing Engineering in partial fulfillment of the requirements for the degree of Master of Science Degree Awarded: Spring Semester 2005 The members of the Committee approve the Thesis of Michael M. Zimmer defended on April 4, 2005. ___________________________ Yaw A. Owusu Professor Directing Thesis ___________________________ Rodney G. Roberts Outside Committee Member ___________________________ Reginald Parker Committee Member ___________________________ Chun Zhang Committee Member Approved: _______________________ Hsu-Pin (Ben) Wang, Chairperson Department of Industrial and Manufacturing Engineering _______________________ Chin-Jen Chen, Dean FAMU-FSU College of Engineering The Office of Graduate Studies has verified and approved the above named committee members. ii For the advancement of technology where engineers make the future possible. iii ACKNOWLEDGEMENTS I want to give thanks and appreciation to Dr. Yaw A. Owusu who first gave me the chance and motivation to pursue my master’s degree. I also want to give my thanks to my undergraduate team who helped in obtaining information for my thesis and helped in setting up my experiments. Many thanks go to Dr. Hans Chapman for his technical assistance. I want to acknowledge the whole Undergraduate Research Center for Cutting Edge Technology (URCCET) for their support and continuous input in my studies. -
Acknowledgements Acknowl
2161 Acknowledgements Acknowl. B.21 Actuators for Soft Robotics F.58 Robotics in Hazardous Applications by Alin Albu-Schäffer, Antonio Bicchi by James Trevelyan, William Hamel, The authors of this chapter have used liberally of Sung-Chul Kang work done by a group of collaborators involved James Trevelyan acknowledges Surya Singh for de- in the EU projects PHRIENDS, VIACTORS, and tailed suggestions on the original draft, and would also SAPHARI. We want to particularly thank Etienne Bur- like to thank the many unnamed mine clearance experts det, Federico Carpi, Manuel Catalano, Manolo Gara- who have provided guidance and comments over many bini, Giorgio Grioli, Sami Haddadin, Dominic Lacatos, years, as well as Prof. S. Hirose, Scanjack, Way In- Can zparpucu, Florian Petit, Joshua Schultz, Nikos dustry, Japan Atomic Energy Agency, and Total Marine Tsagarakis, Bram Vanderborght, and Sebastian Wolf for Systems for providing photographs. their substantial contributions to this chapter and the William R. Hamel would like to acknowledge work behind it. the US Department of Energy’s Robotics Crosscut- ting Program and all of his colleagues at the na- C.29 Inertial Sensing, GPS and Odometry tional laboratories and universities for many years by Gregory Dudek, Michael Jenkin of dealing with remote hazardous operations, and all We would like to thank Sarah Jenkin for her help with of his collaborators at the Field Robotics Center at the figures. Carnegie Mellon University, particularly James Os- born, who were pivotal in developing ideas for future D.36 Motion for Manipulation Tasks telerobots. by James Kuffner, Jing Xiao Sungchul Kang acknowledges Changhyun Cho, We acknowledge the contribution that the authors of the Woosub Lee, Dongsuk Ryu at KIST (Korean Institute first edition made to this chapter revision, particularly for Science and Technology), Korea for their provid- Sect. -
Process, Structure, Property and Applications of Metallic Glasses
AIMS Materials Science, 3(3): 1022-1053. DOI: 10.3934/matersci.2016.3.1022 Received: 15 March 2016 Accepted: 07 July 2016 Published: 26 July 2016 http://www.aimspress.com/journal/Materials Short review Process, structure, property and applications of metallic glasses Bindusri Nair and B. Geetha Priyadarshini * Nanotech Research Innovation and Incubation Centre, PSG Institute of Advanced Studies, Coimbatore, Tamil Nadu, India-641004 * Correspondence: Email: [email protected]. Abstract: Metallic glasses (MGs) are gaining immense technological significance due to their unique structure-property relationship with renewed interest in diverse field of applications including biomedical implants, commercial products, machinery parts, and micro-electro-mechanical systems (MEMS). Various processing routes have been adopted to fabricate MGs with short-range ordering which is believed to be the genesis of unique structure. Understanding the structure of these unique materials is a long-standing unsolved mystery. Unlike crystalline counterpart, the outstanding properties of metallic glasses owing to the absence of grain boundaries is reported to exhibit high hardness, excellent strength, high elastic strain, and anti-corrosion properties. The combination of these remarkable properties would significantly contribute to improvement of performance and reliability of these materials when incorporated as bio-implants. The nucleation and growth of metallic glasses is driven by thermodynamics and kinetics in non-equilibrium conditions. This comprehensive review article discusses the various attributes of metallic glasses with an aim to understand the fundamentals of relationship process-structure-property existing in such unique class of material. Keywords: metallic glasses; glass transition; amorphous; mechanical properties 1. Introduction Metallic Glasses (MG) are a class of materials which has caught the eye of many researchers since Klement et al’s [1] first work on Au-Si alloys in early 1960’s. -
Mechanical Behavior of Amorphous Alloys
Acta Materialia 55 (2007) 4067–4109 www.elsevier.com/locate/actamat Overview No. 144 Mechanical behavior of amorphous alloys Christopher A. Schuh a,*, Todd C. Hufnagel b, Upadrasta Ramamurty c a Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, M.I.T., Cambridge, MA 02139, USA b Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA c Department of Materials Engineering, Indian Institute of Science, Bangalore-560 012, India Received 14 August 2006; received in revised form 29 January 2007; accepted 31 January 2007 Available online 19 April 2007 Abstract The mechanical properties of amorphous alloys have proven both scientifically unique and of potential practical interest, although the underlying deformation physics of these materials remain less firmly established as compared with crystalline alloys. In this article, we review recent advances in understanding the mechanical behavior of metallic glasses, with particular emphasis on the deformation and fracture mechanisms. Atomistic as well as continuum modeling and experimental work on elasticity, plastic flow and localization, frac- ture and fatigue are all discussed, and theoretical developments are connected, where possible, with macroscopic experimental responses. The role of glass structure on mechanical properties, and conversely, the effect of deformation upon glass structure, are also described. The mechanical properties of metallic glass-derivative materials – including in situ and ex situ composites, foams and nanocrystal- reinforced glasses – are reviewed as well. Finally, we identify a number of important unresolved issues for the field. Ó 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. Keywords: Metallic glass; Amorphous metal; Mechanical properties 1.