Prof. Hitoshi Soyama
Hitoshi Soyama has completed his PhD from Tohoku University, Japan. He has been working at Tohoku University since 1991, and he was promoted to a professor at 2003. He was awarded as a Fellow of American Society of Mechanical Engineers ASME and a honorary member of Water Jet Technology Society of Japan. He is known for his work in the fields of cavitation and its practical applications such as water treatment and mechanical surface treatment, i.e., cavitation peening. Although cavitation impacts causes severe damage in hydraulic machineries, his research utilized cavitation impacts for enhancement of fatigue properties of metallic materials.
Improvement of Fatigue Strength of Additive Manufactured Metals by Solid-Liquid-Gas Interfacial Phenomena Induced by Pulse Laser
Additive manufacturing (AM) processing of metallic materials is attractive processing for biomedical and aero-space area, as it is easy to make components directly from computer-aided design CAD with weight saving and design freedom without having to consider machining. Unfortunately, the fatigue strength of AM metals are considerably weak comparing with that of bulk materials. As mechanical surface treatment such as shot peening can improve fatigue strength of metallic materials, it is possible to enhance fatigue strength of AM metals by the treatment. In the case of shot peening had several problems such as dust explosion and/or materials transfer which might be a source of corrosion. Soyama proposed a novel mechanical surface treatment using solid-liquid-gas interfacial phenomena induced by pulse laser. Conventional laser peening is using impact induced by laser ablation. The proposed method is using impact produced by bubble, which develops after laser ablation and behaves as similar to cavitation bubble. Thus, it is called as laser cavitation. In the keynote lecture, the improvement of fatigue life and strength manufactured by electron beam melting EBM by the proposed method was demonstrated. This work was partly supported by JSPS KAKENHI Grant Number 18KK0103.
Prof. Chen Hsu
Lungwha University of Science and Technology, Taiwan
Chen Hsu received his D. Phil. degree from Oxford University in Materials in 1999. Now Dr. Chen Hsu, D. Phil, is a professor of Department of Chemical and Materials Engineering, Editor-in-chief of Nanomedicine & Nanotechnology Open Access published by Medwin publishers, Editorial member of SCIRES Journal of materials, Editorial member of OPAST advanced in nanoscience and nanotechnology. He is also the members of many association. Dr. Chen Hsu and his coworkers have done many interesting research works on, such as, high temperature alloys by heat-pressed process, optical modulation of nanoporous materials, novel semiconductors, superparamagnetics, sensing devices for biosensor in vitro, and nanomedicine …etc. Currently his researches focus on the laser additive and plasma processes for various materials to forming devices, such as normal-temperature hydrogen , hydrocarbon sensors, thermoelectrical semiconductor, superconductor, novel batteries, light emitting displays and touch technique, and novel drug delivery systems without using superpararmagnetic nanoparticles. His especial research aims are concentrated on microstructures to applications.
Possibility and dilemma of P-N Junction Semiconductor for Thermoselectrical Application by Additive Technique
At weather temperatures, PN functioned semiconductors in thermoelectric applications are often thermoelectrically cooled or thermally induced on both sides. In this issue, this study used a PN junction to make a thermoelectric PN-type thermoelectric element. We use the relationship between voltage, resistance and temperature to understand the thermoelectric properties with the Seeback coefficient of the thermoelectric element to calculate the thermoelectric quality of ZT (thermoelectric figure of merit). In this study, a laser laminate was used to make test pieces. The addition of flux helps the deposition of graphene and zinc oxide on the copper substrate to increase adhesion. The two conductors are used to form a closed loop by using a wire. If there is a temperature difference between the two ends of the closed loop, a slight electromotive force is generated. An external power supply is connected at both ends, and one end has heat absorption and one end has heat release, which is called thermoelectric cooling or heating effect, depending on the characteristics of the building elements.
Prof. Liu Feng
Northwestern Polytechnical University, China
Professor Liu is a Distinguished Professor of Yangtze River Scholar, Ministry of Education of China, a recipient of National Outstanding Youth Science Fund Award, StatesRecognizedTalent Project, Chinese Youth Science &Technology Prize winner, also The Youth Leader in Technological InnovationTalents, enjoy the State Council Special Allowance, and the leader of Rapid Solidification and Metastable Materials Research Group of State Key Laboratory of Solidification Technology. Prof. Liu earned a Ph.D. degree from Northwestern Polytechnical University in 2001. After his doctoral study, he was awarded more thanthere-year postdoctoral and Humboldt research cooperation in Max Planck Institute for Metals Research and University of Göttingen in Germany, respectively. Since 2006, he had been visited Max Planck Institute for Metals Research for further academic exchange many times. Prof. Liu owned one won the First-place Prize in Shaanxi Province Science &Technology, and two won the Second-place Prize. He has published over 220 technical papers in important international academic journals and conferences at home and abroad, including 33 papers of IF is more than 3, also including two review papers published inInternational Materials Reviews journal and 28 papers published inActa Materialia journal. His research interests lie in the fields ofnon-equilibrium solidification theory and technology, unifying theories research between non-equilibrium solidification and solid transformation,solid-state phase transformation kinetics, preparation and stability studyof amorphous and metastable nanomaterials and preparation of high strength aluminum magnesium alloys.
Concurring Kinetics of Phase Transition and Grain Growth in Nanostructured Alloy
Experimental observation and theoretical interpretation on the concurring kinetics of grain growth and phase transition in nanostructured Fe91Ni8Zr1 alloy were first presented. From in situ high temperature X-ray diffraction and differential scanning calorimetry, it can be confirmed that concomitant grain growth occurs and comes to a halt before phase transition is fully completed. From the currently kinetic description, grain growth not only adjusts the constitution of enthalpy change, but also influences the kinetics of phase transition. The present findings, offer a new behavior of phase transition owing to the size effect, and further, extend the understanding of the role grain boundary played in solid-state phase transition.
Dr. Diaa Salama AbdElminaan
Information Systems Department, Faculty of Computers and Informatics, Egypt
Assistance Professor, Information Systems Department, Faculty of Computers & Informatics, Banha University, Banha, Egypt. Dr. Diaa does research in Computer Security and Reliability, Distributed Computing and Theory of Computation. Their current project is 'Elastic framework for augmenting the performance of mobile applications using cloud computing'.