To explore the origin and acceleration mechanism of high energy cosmic rays and propagation processes in the galaxy and extragalaxy, extensive air shower have been observed in our campus and several sites in Japan. The simulation study of EAS phenomena as well as astrophysica process have also been carried out to study our aims.
The balloon borne nuclear emulsion chamber have been used to search astronomical gamma rays from the galactic point source and diffusive components. The new technology of nuclear emulsions, so called as Emulsionics, are utilized by producing emulsion gel at our labratory. It allows us to control grain size, density and sensitivities and so on. And the emulsion shifter system provide the timing information of gamma rays. With all these systems, we carried out the balloon flight at Australia (GRAINE 2015 campaign) to resolve Vela pulsar morphology.
The Bolide observation systems have been monitored at our campus since November 2011, and interchange the data with more wide range observation systems.

(1) Electric materials for the next 6G system
　We have synthesized a new polymer with the lowest dielectric constant in all-aromatic hydrocarbon-type polymers, and are developing it for electric materials of the next 6G system.

(2) Production of green hydrogen
　The catalysts and materials for production of green hydrogen are studied such as artificial photosynthesis and electrolysis of water by renewable energy.

(3) Secondary battery with ultra-high capacity
　The new cathode materials with ultra-high capacity in lithium ion battery are developped to increase driving distances for EV.

Tsunami deposits are useful in attempted reconstructins of prehistoric tsunamis. Geological analyses of tsunami deposits can provide estimates of several parameters of tsunamis, such as recurrence intervals and inundation areas. To assess the history of paleotsunami, we investigate the tsunami deposits around the coastal lowlands on the eastern margin of the Sea of Japan. These studies provides useful information for advancing tsunami disaster risk assessment in coastal lowlands.
In addition, we are active in the practice of disaster education.

Several organisms have been servayed and elucidated the density and population structure of their habitat in Asahi river flowing through the Okayama Prefecture. In ecological field research, we examine whether there are common conditions between a organism’s different habitats in Asahi river. We also analyzes the impact of the other species that inhabit the habitat.
In phylogeographic research, We examine whether differences of mitochondrial DNA sequence or morphological characteristics are relevant in geographyical distribution of the inter-regional organism’s group.
We do a demonstration experiment in Okayama Castle inner moat to make sure to suppress the excessive blooming of blue-green algae by competing aquatic plants.

My research area is a representation theory of commutative algebras. I am interested in the category of maximal Cohen-Macaulay modules over Gorenstein rings. I have also an interest to the totally reflexive modules. Because the following conditions are equivalent:

1. The base ring R is Gorenstein.
2. For any finitely generated R-module M, enough large syzygy module of M is totally reflexive.

Moreover, the category of totally reflexive module is a Frobenius category. So, the stable category of it has a triangulated category structure.

I am studying these categories by using above properties.

Our laboratory researches the new functional material by using high-pressure technique. It is important for materials properties the crystal structure and electrical structure. High-pressure X-ray diffraction studies are carried out by using the synchrotron source, ex. SPring-8 at Aioi, Photon factory at Tsukuba. The high pressure synthesis by the piston cylinder method are carried out at Institute for Planetary Materials in Okayama University.
Recentry we research the Mg2Si thermoelectric material wich is expected as an environmental friendly material.

Dissolved organic matter (DOM) is a ubiquitous material in the hydrosphere and plays many important roles. In soil water, DOM is not only the main energy source for microorganisms but changes the mobility and toxicity of other chemicals such as metal ions or organic pollutants by forming complex or adsorbing itself. DOM controls the growth rate of microorganisms and water quality of soil, river and even sea water. For these reasons, DOM dynamics is very important. To study DOM dynamics in aquatic ecosystems in qualitative and quantitative ways, we characterize DOM in various naturalwater samples using TOC analyzer, excitation-emission matrix fluorescence spectroscopy (EEM) and Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT ICR MS).

My research interests are in the area of differential equations, functional differential (or difference) equations and integral equations with infinite delay. We have established linear theory for these equations via functional analytic methods; and now develop theory of invariant manifolds, specifically center manifolds, together with theory of bifurcation structure of solutions.

The aim of the research is to clarify the origin and evolution of the Solar System using various types of meteorite samples. Analytical techniques I am using for the studies are optical microscope, scanning electron microscope, electron probe micro analyzer (EPMA) and Micro Raman spectroscopy etc. Our target bodies are all of the celestial bodies include Earth. I am also joining the deep space exploration. My E/PO activities are exhibitions of meteorites and public lectures.

I reconstruct paleovegetation by pollen analysis contained in sediments such as lakes and marshes, and elucidate how the environment changed in the past. I also research the human impacts on vegetation using charcoal analysis. Currently, I am focusing on the chronological study of human migration to the eastern Polynesia. In addition, we measure airborne pollen, understand the scattering status of hay fever pollen. And we report these data to the Japan Meteorological Association, and forecast scattering for the next year.

Graphene, integrated into the 3D nanoarchtecture with the smoothly interconnected curved surface, is promissing to clarify the novel properteis of the curved atomic layers adding to the amplifications of various material performance per unit projected area. We experimentally clarify the basic properties of the electrical transport on the 3D curved surface utilizing the high quality 3D graphene materials (so-called 3D nanoporous graphene). We also focus on the coexistence of the localized and itinerant electron properties originating from nitrogen-doping induced the local structural deformation of the 3D curved surface toward applications for the catalyst electrodes and thermoelectric materials using multifunctional electronic properties.

I are investigating fiber bundle determined by singularities by using Newton polygon and pertubations of maps. This technique allows you to study singularities with combinational information. Based on this information, I am studying fibers of and monodromy of fiber bundles.

The integral of a function is intuitively the “area under the graph”, but it is now generalized in many ways. And when functions “converge” the function in some sense, do their integrals also converge it? The question “is this true?” can be a yes or no. The answer depends on the situation. By clarifying the nature of the concept of integrals, I am trying to clarify the mechanism by which such things do or do not happen.
Also, probability and integration are closely related. The so-called “expected value” or “variance (standard deviation)” is the integral of a random variable, and stochastic integrals are used to analyze stochastically varying processes such as stock prices.
However, the concept of “probability” that currently prevails in mathematics does not match well enough the image that people have of “probability. For this reason, there is still a debate among philosophers as to what probability is. This also has a negative impact on probability in school education. By resolving this issue, the human way of thinking about probability should evolve.