ACMME2018 Keynote & Plenary Speakers
Prof. Omar S. Es-Said
Loyola Marymount University, USA
Biography: Omar S. Es-Said is a professor in the Mechanical Engineering Department at Loyola Marymount University in Los Angeles, California. He was hired as an assistant professor from 1985-1992, associate professor from 1992-1998, and full professor from 1998-present. He received his B.S. degree in physics and his M.S. degree in solid state physics from The American University in Cairo. He received his PhD in Metallurgical Engineering and Materials Science from the University of Kentucky, Lexington in 1985. His current research interests include metallic processing, modeling, experimental, techniques, and failure analysis. He published over 300 papers, which included refereed journal articles, conference proceedings, industrial reports, and Department of Defense (DoD) reports. He has been an associate editor from 2008-present for the American Society of Materials’ (ASM) Journal of Materials Engineering and Performance (JMEP). He has been a key reader for the Metallurgical Transactions A Journal from 2004-present. He has been on the editorial board of the Engineering Failure Analysis Journal from 2003-present. He received several awards: The Society of Automotive Engineers (SAE), Teetor Award in 1994, until the Elmer L. Hann Award from The Society of Naval Architects and Marine Engineers in 2011. He received several grants for research funds and research equipment from the National Science Foundation (NSF), NASA, Boeing Cooperation, and the Navy for a total of over $3.2 million dollars. He was a consultant for the Navy from 1994-present. He was hired as a Distinguished Summer Faculty Fellow at The Navy Facilities Engineering Services Center (NFESC) in the summers of 2010-2014. He became an American Science of Materials (ASM) Fellow in 2005. He was an invited speaker in many conferences and universities including: Cambridge University, The American University in Cairo, and Paris 8 University.
Title of Speech: 4340M Steel Shot Peening Coverage ( 100%, 200%, and 300%) Comparison
Abstract: Shot peening method has been widely used for improving the fatigue performance of structural component. The method increases the fatigue life with few detrimental side effects, if it is properly controlled. Shot peening could optimize the fatigue life of an Ultra-high strength material such as 4340M steel. To ensure optimum results, shot peening factors should be carefully analyzed. Shot peening factors include: peening media, peening intensity, and peening coverage. The objectives of the study are to increase the fatigue life of the 4340M by shot peening, and to compare three different shot peening coverages (100%, 200%, and 300% coverage), to choose the optimum coverage for the 4340M steel. This steel has ~55 HRC hardness and is loaded in a fully reversed way or the stress ratio R=-1. Fatigue lives, or number of cycles, were obtained using a rotating bending machine, to compare the three coverage performances. Results showed that the optimum coverage for the 4340M steel is 200%. Scanning Electron Microscopy (SEM) was used to evaluate the microstructural properties, hence to know the crack nucleation sites and to estimate the depth and the length of the crack. Additionally, SEM was used to differentiate between the three coverages. Residual stresses were measured for each coverage using X-ray diffraction method.
Prof. Dennis K. Lieu
University of California, Berkeley, USA
Biography: Dennis Lieu is a Professor of Mechanical Engineering and former Associate Dean of the College of Engineering at UC Berkeley. He received his BS, MS and D.Eng. in Mechanical Engineering from UC Berkeley in 1977, 1978 and 1982, respectively. After working for six years as a design engineer in industry, he returned to his alma mater and has been a member of its faculty for 30 years. He is the author or co-author of numerous articles on permanent magnet motor design and engineering graphics education, and is the lead author of Visualization, Modeling, and Graphics for Engineering Design (Cengage Publishers). His research interests are in the design of electro-mechanical devices and the design of sports equipment. He is a recipient of the UC Berkeley Distinguished Teaching Award. In 2008, he was awarded the Orthogonal Medal for his contributions to engineering graphics education. In 2015, he received the Distinguished Service Award from the Engineering Design Graphics Division of the ASEE. Prof. Lieu is currently engaged in the development of design courseware associated with the new Jacobs Design Institute at UC Berkeley.
Title of Speech: Kinetic Energy Storage and Recovery for Hybrid Vehicles
Abstract: Regenerative braking in hybrid vehicles is an emergent technology that has successfully increased vehicle fuel economy by utilizing the bi-directional energy flow capability of electric motors to capture and reuse the vehicle’s kinetic energy normally dissipated during braking. However, regenerative braking has been hampered by current chemical battery technology; only 40% of the available braking energy is captured and reused, limited by the relatively poor charge rate of popular battery technologies, including lithium-ion. Excess energy the batteries cannot accept is still simply lost. Flywheels are capable of much faster rates of charge/discharge, and thus would be capable of augmenting the areas where batteries fall short by providing high power density and efficiency for regenerative breaking and acceleration. The efficiency of regenerative braking can be improved by increasing the power density of the hybrid system through the use of a flywheel as a mechanical “surge battery”. Although flywheel energy storage systems have been studied for many years and are even used in car racing applications, there is still a need for the development of cost-effective, reliable systems for commercial and consumer vehicles. This project seeks to develop an innovative, low-cost triple-hybrid (gasoline engine, electric motor, and mechanical flywheel) system that will have improved regenerative energy storage and acceleration when compared to traditional hybrids which employ only batteries in energy storage.
Prof. Yong Suk Yang
Pusan National University, Korea
Biography: Yong Suk Yang is a Professor Emeritus in the Nanoenergy Engineering Department and former Dean of the College of Nanoscience & Nanotechnology, and former Director of the Research Center for Dielectric and Advanced Matter Physics at Pusan National University. He received his BS in physics in 1977 from Sogang University, Seoul, and PhD in solid state physics in 1990 from McGill University, Montreal. He is a faculty member since 1993. He has been carrying out experiments at neutron- and synchrotron radiation- related international facilities, NSLS, APS, SSRL, Oak Ridge (USA), AECL (Canada), SPring8 (Japan), Riso (Denmark), KAERI (Korea). He has published various articles on the phase transitions of structural order-disorder, spin dynamics on low dimensional magnet, glass-crystallization through nucleation and growth, negative thermal expansion. Multiferroics, dielectric relaxation, solid oxide fuel cell, lithium ion battery are also his recent interests. Not only research but he also emphases the importance of education and training. He has taught under and graduate students over 30 different subjects, quantum mechanics, statistics, solid state physics, thin films, electronic properties of materials, thermoelectric, semiconductor, thermal physics, ceramics, dielectrics, modern physics…, during the last 20 years.
Title of Speech: Temperature dependency of Structural Instability and Oxygen behavior in LixNi0.5Mn1.5O4 Electrode for Lithium Ion Battery
Abstract: LiMn2O4, one of the cathode materials for lithium battery, has the advantage of low cost, environmental sustainability, high ionic and electronic conductivities. LiNi0.5Mn1.5O4, the LiMn2O4 modified material, has attracted interest because of the high operating voltage with dense energy. There exist two kinds of LiNi0.5Mn1.5O4 spinel structures. One is the face-centered cubic FCC, called disordered structure, and the other is the primitive simple cubic SC, called ordered structure. The production, whether the crystal structure belongs to FCC or SC, is much dependent on the synthesizing process. The SC spinel can be obtained by annealing LiNi0.5Mn1.5O4 in air below 700 oC. Meanwhile, with higher synthesizing temperature than this, the FCC disordered structure is produced, and the high temperature phase is normally accompanied with a secondary phase, assigned either to NixO, (LiNiMn)xO, or LixNi1-xO. In this study, different Li compositions of LixNi0.5Mn1.5O4 powder were prepared by sol-gel process and the changes of weight, ionicity, composition and structure under different environments in the broad temperature range have been investigated to trace the origin of structural instability during the synthesizing process.
Prof. Ching An Huang
Chang Gung University, Taiwan
Biography: Prof. Ching An Huang received the B. S. degree in Department of Mechanical Engineering from National Chiao Tung University, Taiwan, in 1983 and Dr.-Ing. in Department of Materials Engineering from Aachen University, Germany, in 1993. In 2006, he joined the faculty of Chang Gung University, Taoyuan, Taiwan, where he is currently a Professor with the Department of Mechanical Engineering. His main research interests are microstructure analysis of materials, electropolishing behavior, corrosion engineering, and electroplating technology. Based on his research results, he published about 60 articles in SCI journals, such as Thin Solid Films, Surface and Coatings Technology, Electrochimica Acta, and Materials Science and Engineer A etc. Moreover, he got about 10 patents from Taiwan, Main China, USA, and Japan.
Title of Speech: Development and applications of electroplated diamond tools with Ni-Cr-C or Ni-B substrate
Abstract: Unlike powder metallurgy, electroplating is a low temperature and cost process. Therefore, electroplated diamond tools are widely used for cutting hard-to-cut materials, such as ceramics of Al2O3 and SiC with high hardness values. To fabricate an electroplated diamond tool, a metal-diamond composite coating is electroplated on a suitable tool substrate; for example, a medium carbon steel substrate. The composite coating can be easily achieved through composite electroplating in a Ni-Watt bath containing diamond particles in sizes between 30 and 50 µm to obtain a Ni-diamond composite deposit on the tool substrate. It is well known that a relatively high hardness of composite substrate is helpful to increase the cutting ability of an electroplating. In this presentation, electroplated diamond milling tools with metal-diamond substrates of Ni, Ni-B- and Ni-Cr-C deposits were prepared respectively on a medium carbon steel. Fabrication of electroplated Ni-B-diamond and Ni-Cr-C-diamond milling tools will be introduced. The former was electroplated by using intermittent stirring method during direct-current electroplating, and the latter was made through sequential three-step electroplating processes. The milling abilities of prepared electroplated diamond milling tools were evaluated through their maximum milling lengths on an Al2O3 plate. Prior composite electroplating, a Ni undercoat with a thickness of 50 µm was electroplated on the steel rod. The Ni-B-diamond composite electroplating was conducted in the Ni-Watt plating bath with an addition of 3 g/L TMAB and 300 g/L diamond particles. Experimental results show that the diamond density is strongly affected by the stirring cycle applied. A relatively high diamond density in the Ni-B-diamond composite coating was obtained through intermittent stirring with an on period of 5 s and an off period of 80 s. The milling ability of electroplated Ni-B-diamond milling tool is much higher than that of electroplated Ni-diamond milling tool. Moreover, a relatively high milling ability of the Ni-B-diamond tool was evidenced after annealing at 300 or 500oC for 30 min. The Ni-Cr-C-diamond composite was prepared through three sequential steps of Ni coating, Ni-diamond co-deposition, and Cr-C strengthening coating. Co-electrodeposition of Cr-C-diamond was performed in a trivalent Cr plating bath. Because the hardness of 500oC-annealed Cr-C coating could be increased to 1600 Hv, the milling ability of 500oC-annealed electroplated Ni-Cr-C-diamond milling tool is obviously higher than that of annealed electroplated Ni-B-diamond one. The Cr-C deposit is suitably used as the metal-diamond substrate for fabricating an electroplated diamond tool.
Assoc. Prof. Ki Tae Nam
Seoul National University, South Korea
Biography: Dr. Nam has been an associate professor of the Materials Science and Engineering at the Seoul National University since 2010. He received the B.S degree and M.S degree in Materials Science and Engineering from Seoul National University, and the Ph.D. in Materials Science and Engineering from Massachusetts Institute of Technology with the award “Outstanding PhD Thesis” in 2007. He worked as a postdoc at the Molecular Foundry in the Lawrence Berkeley National Laboratory. His research interest is currently on the bioinspired materials synthesis and electrochemical devices for Solar Fuel. His scientific contribution to this research include his PhD work- Virus Based Battery published in Science 2006 and Nature Materials 2006 and his postdoc work- Peptoid 2D Assembly in Nature Materials 2010. In 2016, his group published perovskite based photocatalysis in Nature Energy. He also served as the academic consultant for LG Electronics and LG Display.
Title of Speech: Mn Based Water Oxidation Electrocatalyst
Abstract: Water splitting is regarded as a promising step towards environmentally sustainable energy schemes because electrolysis produces only hydrogen and oxygen, without any by-products. The oxygen evolution reaction (OER), an anodic half-cell reaction, requires extremely high overpotential due to its slow reaction kinetics. In nature, there exists a water oxidation complex (WOC) in photosystem II (PSII) comprised of the Mn and Ca elements. The WOC in PSII, in the form of a cubical Mn4CaO5 cluster, efficiently catalyzes water oxidation with extremely low overpotential value (~160 mV) and a high turnover frequency (TOF) number (~25,000 mmolO2 mol-1Mn s-1).
We first identified a new crystal structure, Mn3(PO4)2-3H2O, and demonstrated its superior catalytic performance at neutral pH. We revealed that structural flexibility can stabilize Jahn-Teller distorted Mn(III), and thus facilitate Mn redox during catalysis. Additionally, a new pyrophosphate based Mn compound, Li2MnP2O7 was studied. We verified the influence of Mn valency and asymmetric geometry on water oxidation catalysis using Li2MnP2O7 and its derivatives.
Specific questions that our group intensively focus for the further applications include 1) how we can translate the underlying principles in Mn4CaO5 cluster into the synthetic heterogeneous catalysts and 2) how we can mimic the redox molecule involved biological dark reaction for the CO2 reduction. Toward this vision, we have been developing a new catalytic platform based on sub-10 nm uniform nanoparticles to bridge the gap between atomically defined biological catalysts or their metalloenzyme counterparts and the scalable, electrode depositable heterogeneous catalysts. In this approach, the local atomic geometry is controlled by the nitrogen containing graphitic carbon and the heterogeneous atom doping, that enhance the catalytic activity and selectivity. Additional surface modification by the specific ligand allows for the atomic scale tunability to realize the unique electronic hybridization.
ACMME2017 Keynote Speakers
Prof. Omar S. Es-Said
Loyola Marymount University, USA
Prof. Dr. Mohd Hamdi Abdul Shukor
University of Malaya, Malaysia
Prof. Ching An Huang
Chang Gung University, Taiwan
Prof. Jiyoung Kim
The University of Texas at Dallas, USA