[Category II] Ionized Gas Dynamics Laboratory
Device Science and Engineering
Yukihiko Yamagata , Associate Professor
Plasma and laser processing using the advantage of ionized gas dynamics can potentially cause a variety of unique physical/chemical interactions, and is widely used as one of the advanced technologies for supporting sustainable society in various research fields such as electronics, material science, and environmental science. Our group tries to develop next generation technologies by application of plasmas and lasers. These include spectroscopic characterization of optical/electronic device systems, development of new-type optical sources, decomposition of environmental pollutants, development of electronic materials and devices operable under harsh environments, and development of biomedical materials and devices compatible with the human body.
1. Study of plasma and laser processing by laser diagnostics
2. Remote measurement of temperature/strain of semiconductor devices
3. Synthesis of low-k films using DUV pulsed-laser deposition
4. Field emission devices using nanostructured materials
5. Diodes and capacitors using wide band gap semiconductors for high temperature condition
6. Surface functionalization and biological characterization of ultrahard materials
[Category Ⅲ] Thermal Science and Energy Laboratory
Mechanical and Systems Engineering
Professor Hiroaki Watanabe , Assistant Professor Reo KAI,
Low carbonization of energy systems such as power generation and transportation systems such as aircrafts is an extremely important issue for humankind. In our laboratory, we are investigating innovative energy conversion/combustion technology that realizes a low-carbon society by means of numerical simulations and experiments of fluid dynamics with thermochemistry coupled with infromation sciences, which are the core elements of the system.
- Highly efficient and zero emission gas turbine
- Low-NOx aircraft jet engines
- Highly efficienty energy conversion of solid materials
- Methane hydrate utilization technology
[Category II] Energy Chemical Engineering
Plasma and Quantum Science and Engineering
Associate Professor Kazunari Katayama , Assistant Professor Makoto Oya,
With the aim of developing attractive next-generation energy systems, we are engaged in education and research in the fields of chemical engineering such as process engineering and thermal mass transfer engineering. Through fundamental experiments, we try to model chemical reactions and mass transfer phenomena, and then to use numerical simulations to pursue optimal systems. In the development area of most advanced science and technology, there are many situations in which it is difficult to predict phenomena based on just conventional knowledge.In our laboratory, we are challenging to correctly understand and model mass transfer phenomena occuring in special environments such as the interface between plasma or supercritical CO2 and solid walls, the flow field of high-temperature melts (liquid metals and molten salts), and the field of nuclear transmutation reaction by neutrons. Additonally, we are also actively studying on the hydrogen production using solid electrolyte cell or plasma, and environmental dynamics of tritium, which is a radioactive hydrogen isotope. These scientific achievements will be useful for the realization of nuclear fusion reactors, next-generation fission reactors, and a society utilizing hydrogen energy and renewable energy.
・Development of fuel cycle system in fusion power plants.
・Modeling of tritium mass transfer phenomena in soils and plants
・Development of liquid metal and molten salt circulation system
・Development of hydrogen production / extraction technology using plasma, solid electrolytic cells, etc.
[Category Ⅲ] Science on social and environmental complex systems
Professor Jun Tanimoto , Assistant Professor Yoshiko Katahira,
To solve environmental problems with bringing meningul provisions to our society, we should model complex systems as literally they are, not to much simplified. For ensuringn such modeling, we do need to take a bottom-up approach not relying on a conventional analytical approach from top-down viewscope. In the laboraotory, we explored various studies with intensive scientific passions so as to clarify the mechanisms of 'Human-Environemnt-Social system' by employing applied mathematics and social physics underpined by complex science, evolutionary game theory, non-linear dynamics and multi-agent simulation.
dillema structure in complex science
disease spread machanisms
traffic flow dynamics
[Category Ⅲ] Architectural Environmental Engineering
Mechanical ans Systems Engineering
Professor Kazuhide Ito , Assistant Professor Kazuki Kuga,
The overarching objectives of our research team are to develop a comprehensive and universal CSP (i.e., an in silico human model or computer simulated person) for indoor environmental quality assessment; and to develop an integrated numerical simulation procedure for airflow, temperature, and contaminant transport by CFD (computational fluid dynamics) technique using the newly created CSP.
Developmemtn of in silico human model
Inhalation exposure analysis by Physiologically-Based Pharmacokinetics
Airborne transmission analysis of virus laden droplet in infoors
Thermal comfort and sensation analysis
[Category Ⅲ] Thermal Energy Conversion Systems
Mechanical and Systems Engineering
Professor Takahiko Miyazaki , Associate Professor Kyaw Thu,
In TECS lab, we are actively working on thermal energy conversion systems. The key research areas include heat pumps (mechanical & chemical), heat engines (ORCs), evaporative coolers (M-cycle) and desalination (thermal) systems. We develop and investigate adsorbent materials (activated carbon & composites), thermophysical properties, adsorption isotherms & kinetics, thermodynamic models and system simulation of adsorption heat pumps. For mechanical vapour compression systems, we measure the thermophysical properties of NEXT-generation refrigerants (being members of NRXT-RP center, I2CNER), conduct cycle performance and the equation of state (EOS).
- Adsorption heat pump
- Biomass derived actibated carbons for dehumidification
- Heat pump systems with low global waming potential refrigerant
- Thermal management for electric vehicles
[Category II] Nonlinear Physics
Device Science and Engineering
Associate Professor Hidetsugu SAKAGUCHI , Associate Professor Kai MORINO , Assistant Professor Tomokatsu ONAGA,
Our laboratory focuses on various theoretical problems of nonlinear systems based on knowledge of physics, mathematics, and informatics. We employ numerical simulations for analyses of nonlinear systems such as chaos and fractal and of complex systems that a lot of elements are strongly coupled. We also analyze the robustness of nonlinear dynamical systems under severe damages including power networks. We investigate algorithms of machine learning and brain-morphic AI based on nonlinear dynamics and construct mathematical models for the prediction of real dataset. We also analyze a vortex soliton in the Bose-Einstein condensates at ultra-low temperature and a spiral pattern in a mathematical model for the aggregate of amoeba-like unicellular organisms called cellular slime molds. For more details, see our website.
●Synchronization of nonlinear oscillators
●Mathematical analyses of real datasets
●Dynamical robustness and machine learning algorithms based on nonlinear dynamics
●Vortex solitons in Bose-Einstein condensates
●Aggregation pattern of cellular slime molds