Tohoku University. Research Profiles

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"O" Researcher - 15 Result(s)

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Innovative Preparing and Thick Coating Technique without Heat Affected Zone and Phase Transformation

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Features
The cold spray (CS) technique is known as a new technique not only for coating but also for thick depositions. It has many advantages, i.e. dense coating, high deposition rate, low oxidation, and no phase transformation. We have been carrying out establishment of innovative preparing and coating techniques using the CS, and maintenance of reliability and safety of the cold sprayed repairing parts and coatings. Moreover, in order to evaluate the compatibility between a substrate material and particles based on an adhesion mechanism and scientific basis, various adhesion conditions are examined a micro / nano-structure observation and a molecular simulation.

Targeted Application(s)/Industry
Our targets were mainly hot section parts of thermal power plants and reactor piping and tubes etc. Recently, it is possible to make a ceramic coating. Therefore, we accelerate the evolution of the other fields including the creation of the functionality materials in near future.

Fracture and Reliability Research Institute, Graduate School of Engineering
OGAWA, Kazuhiro, Professor Doctor of Engineering

Molecular Dynamics Analysis of Coating and Surface Modification

Molecular-scale mechanism of solid-liquid affinity, wettability, thermal boundary resistance and molecular deposition are analyzed by molecular dynamics simulations toward its control. With a background of heat and mass transport and interfacial thermodynamics, transport phenomena of various scales ranging from spin coating of photoresist to SAM (self-assembled monolayer) and hydrophobic/hydrophilic treatment by attaching some molecular basis are studied. Futhermore, the molecular-scale mechanisms which determine thermophysical properties and the molecular structure that realizes desired thermophysical properties are studied. We can conduct effective collaboration and provide academic consultations to companies interested in our research.

Institute of Fluid Science
OHARA, Taku, Professor Doctor of Engineering

Development of a High-Efficiency Hydrogen Transportation and Storage System Using Slush Hydrogen and Liquid Hydrogen

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Features
Solid-liquid two-phase slush hydrogen has a number of desirable characteristics as a functionally thermal fluid, taking advantage of the high density and latent heat of fusion due to the solid particles. The principal researcher has been proposing a high-efficiency hydrogen energy system (Fig. 1). The principal researcher has also undertaken research and development works such as density and mass flow-rate meters for slush hydrogen (Fig. 2), heat transfer characteristics of slush hydrogen as the refrigerant for superconducting machines, and a numerical analysis for thermo-fluid characteristics of slush fluid flow (Fig. 3).

Targeted Application(s)/Industry
We hope to conduct collaborative research with a willing company for a practical application of these technologies in hydrogen energy industry.

Institute of Fluid Science
OHIRA, Katsuhide, Professor Doctor of Engineering

Research and Development of Ultra-Low Power Spintoronics-Based VLSIs

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Features

Under the project "Research and Development of Ultra-low Power Spintronics- based VLSIs" (core researcher : Hideo Ohno) supported by JSPS's FIRST, the Center for Spintronics Integrated Systems (CSIS) aims to overcome the performance ceiling by power consumption increase and interconnection delay in logic integrated circuits. We lead the world in spintronics technology through our design and fabrication of spintronics-based CMOS logic integrated circuits, and by demonstrating ultra-low power and high performance potential through the use of 30nm-diameter spintronics devices which are non-volatile, high speed, and highly reliable.


Targeted Application(s)/Industry

Very large logic integrated circuits, where intelligent systems are integrated on a single chip die, are the key technology not only for information communication systems but also for energy systems and other infrastructure in modern society. The CSIS research aims at developing spintronics technology through collaboration among industry, universities, and government laboratories.

Center for Spintronics Intergrated Systems (CSIS)
OHNO, Hideo, Professor Ph.D.

Advanced Software Development Environment Based on a New Functional Language SML#

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Features

We have been developing a new functional programming language, SML#. This language combines the benefits of higher-order and typed programming language ML with the practically important features including: flexible treatment of record structures through record polymorphism, seamless interoperability with C language, and seamless integration of SQL, a standard database query language. These features make SML# a viable alternative to existing programming languages in developing large and complex software systems. In particular, its seamless integration of SQL would enhance the productivity and reliability in developing recently emerging cloud computing software, for which database access and high-level programming are essential.


Targeted Application(s)/Industry

We hope to conduct collaborative research with a willing company on developing advanced and reliable software development environment based on SML# and the underlying language technologies.

Research Institute of Electrical Communication
OHORI, Atsushi, Professor PhD

Biomodel for Development of Endovascular Treatment

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Features
We perform in-vitro or computational researches for development of medical devices. We develop a model of artery or bone to evaluate medical devices. And we apply optimization way for development of medical devices. Our main target is, currently, stent, or catheter.

Targeted Application(s)/Industry
Our collaboration company can be; medical equipment, device, medical image, MEMS, standardization, medical training, or polymer.

Institute of Fluid Science
OHTA, Makoto, Professor Doctor of Engineering

Development of new materials based on the calculation of thermodynamic properties through electronic theory

Features
We are conducting studies on computing the free energies of materials; the structures and physical properties of grain boundaries and stacking faults; and the thermodynamic properties of the liquid and glassy phases by coupling first-principles calculations and cluster variation methods, as well as quantum molecular dynamics.

Targeted Application(s) / Industry
Furthermore, the world’s highest-purity materials are produced through a combination of chemical and physical refining methods to confirm the calculated thermodynamic properties with high accuracy and to develop new materials such as magnetic materials, semiconductors, and lightweight materials based on Mg and Al alloys.

Institute of Multidisciplinary Research for Advanced Materials
OHTANI, Hiroshi, Professor Doctor of Engineering

Hybridized Organic and Polymer Nanocrystals for Optically Functional Materials

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Features
Organic-inorganic hybridized nano-material is one of the most important objectives in current material science, which would provide peculiar properties and unique function induced by optoelectronic interactions at the interface. Aiming at the development of novel nanostructure toward photonic devices, we have tried to fabricate well-defined core-shell type hybridized nanocrystals and their ordered array structure, and to evaluate linear and nonlinear optical properties.

Targeted Application(s)/Industry
Optical devices will contribute the development in the information and commutations, medical field etc. in near future. In addition, these employed fabrication techniques will be applied smoothly to polymer industry so as to enhance remarkably properties in polymer composites.

Institute of Multidisciplinary Research for Advanced Materials
OIKAWA, Hidetoshi, Professor Doctor of Science

Developing energy creation and saving materials

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Features
Most innovations have been triggered by advent of new materials. We focus on to explore new inorganic materials and their synthesis routes on the basis of our knowledge about the material design and various materials processing technologies. We develop proton conducting phosphate glasses working at intermediate temperatures and narrow gap oxide semiconductors applicable in visible and NIR regions, simple and safe synthesis routes to cadmium-free quantum dot phosphors and colloidal indium arsenide quantum dots for solar cells. Thin-film solar cells, fuel cells and light-emitting devices using those materials are also developing.

Targeted Applications / Industry

We focus on oxide semiconductors, proton conducting electrolytes and electrodes, quantum dots and nanocrystals in order to apply them in solar cells, fuel cells, light-emitting devices and displays. But, applicable area of our technologies is not limited in those applications.


Institute of Multidisciplinary Research for Advanced Materials (IMRAM)
OMATA, Takahisa, Professor Doctor of Engineering

Precipitation Hardened Co-based Alloy

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The high-temperature strength in Co-based alloys is inferior to that in Ni-based superalloys due to no available ’ phase for strengthening Co-based alloys. We have found a new intermetallic compound Co3(Al,W) ’ phase, and /’ Co-Al-W-based wrought and cast alloys show excellent high-temperature strength. The /’ Ir-Al-W-based alloys are also available for high-temperature uses at over 1100 °C. The Co-based alloys also have good wear resistance. For example, friction stir welding (FSW) of high-softening-temperature materials such as steels and titanium alloys is possible using a Co-based alloy tool. We hope to conduct collaborative research with willing company for a practical application of the Co- or Ir-based alloys for high-temperature uses including FSW applications.

Department of Metallurgy, Graduate School of Engineering
OMORI, Toshihiro, Associate Professor Ph.D.

A Comparative Semantic Analysis of English and Japanese

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Features
When people communicate with each other through language, what mechanisms are there to convey meanings? Do the mechanisms vary from language to language, or are they the same across languages? These are the questions to which I am seeking answers through my research on English and Japanese. Sometimes one word can express several different meanings. For example, if you say "There is a newspaper on the table", "newspaper" denotes a printed matter, whereas if you say "The newspaper denounced the injustice", the same word denotes the media. The coexistence of multiple possible meanings for a single word or phrase is called polysemy. I am interested in how people produce and understand words with many different meanings in actual communication.

Targeted Application(s)/Industry
The outcome of my research will bring better understanding of polysemy and contribute to the foundation of language processing and automatic translation, and to construction of lexicons (dictionaries) that are used for those purposes. It will also make contribution to the development of materials and methods in foreign language teaching/learning.

Graduate School of International Cultural Studies
ONO, Naoyuki, Professor Doctor of Letters

“HYDRIDE" Researches for Energy Applications

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Features
This group is engaged in basic and applied researches of "hydrides" for practical use in hydrogen energy system. The main subject is the exploration of advanced hydrogen storage materials which support hydrogen energy technologies such as fuel cells. Currently, we synthesize a wide variety of novel hydrides composed of lightweight metals with specific nano-structures using advanced techniques for crystal and electronic structure analyses. In addition to the hydrogen storage, we develop the wide research fields related to hydrides, such as fast lithium ionic conductors.

Targeted Application(s)/Industry
Besides the contributions in industrial progress through the material development for future hydrogen energy system and next-generation secondary battery, we positively provide technical assistance to organizations and companies concerned about our findings.

WPI Advanced Institute for Materials Research /Institute for Materials Research
ORIMO, Shin-ichi, Professor

Development of Terahertz Semiconductor Devices Using Novel Nano-Heterostructures and Materials and their ICT Applications

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Features

Terahertz coherent electromagnetic waves are expected to explore the potential application fields of future information and communications technologies. We are developing novel, ultra-broadband integrated signal-processing devices/systems operating in the terahertz frequency regime employing novel semiconductor nano-heterostructures and materials.
Frequency-tunable plasmon-resonant terahertz emitter and detectors and metamaterial circuits. By using an original dual-grating-gate high-electron mobility transistor (DGG-HEMT) structure with InP-based material systems record-breaking ultrahigh-sensitive detection and coherent monochromatic emission of terahertz radiation have been realized at room temperature. These devices work for terahertz imaging and spectroscopy.
Ultimately-fast terahertz transistors utilizing graphene, carbon-based new material, and compound semiconductor heterojunction material systems.
Graphene-based novel terahertz photonics devices, breaking through the limit on conventional technology. Recently we have succeeded in observation of light amplification of stimulated emission of terahertz radiation from optically pumped graphene. This will be the first step to realize a new type of graphene-based terahertz lasers.


Targeted Application(s)/Industry

By making full use of these world-leading device/circuit technologies, we are exploring future ultra-broadband wireless communication systems as well as spectroscopic/imaging systems for safety and security. We hope to conduct collaborative research with a willing company for a practical application of this technology in industry.

Research Institute of Electrical Communication
OTSUJI, Taiichi, Professor Doctor of Engineering

Development of Frequency Tunable Coherent TERAHERTZ Light Sources and their Potential Applications

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Features
Terahertz wave (THz) is quite new electromagnetic wave. THz wave is expected to show wide variety of important practical applications. In view of the scientific fields, THz spectroscopy can reveal quite new inter-molecular vibration. We successfully realized the THz wave emission via both non-linear optical effects of NIR laser light and the high frequency semiconductor device operations. The frequency region realized is ranging between 0.03THz and a few 10 THz. It is also noted that the device assembly of THz semiconductor devices and the crystal growth of non-linear optical crystal have been performed in our laboratory.

Targeted Application(s)/Industry
Applications
Non-destructive and non-contact defect recognition of building blocks and water diffusion recognition in polymers, paints, woods and concrete, adhesion failure of ceramics tiles on concrete walls, chirality discrimination of medicines, hydro-oxide formation of medicines, recognition of polytypes of organic and nonorganic crystalline compounds, THz spectroscopic imaging using specific molecular vibrations

Industry
Civil and architecture engineering, Metal construction like bridge, tunnel construction, automobile and train, semiconductor fabrication, electronic device fabrication, medicine, chemical engineering.

Department of Materials Science and Engineering, Graduate School of Engineering
OYAMA, Yutaka, Professor Doctor of Engineering