Research Profiles

JP

"I" Keywords - 65 Result(s)

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 I

[in-situ]

newQuantitative analysis of microstructure in nuclear materials by week-beam scanning transmission electron microscopy

概要

We have developed a technique for quantitative analysis of microstructures (e.g., dislocations and irradiation defect aggregates) of activated and nuclear-burned specimens in the context of the Week Beam Scanning Transmission Electron Microscope (WB-STEM) method, which boasts extremely high measurement accuracy as a quantitative analysis method for lattice defects.
In combination with a dedicated heated sample holder with fully automated temperature measurement and current control in a cartridge-type heating furnace, changes in dislocation microstructure can be dynamically measured in-situ along with a highly reliable temperature history.

従来技術との比較

Conventional TEM methods require expertise in reciprocal space and dislocation theory, but our WB-STEM method is equipped with automatic analysis software for film thickness measurement and dislocation loop feature extraction, making it possible to analyze irradiation defects easily and precisely.

特徴・独自性
  • Since its design, the WB-STEM method has been developed for implementation and on-site repair in radiation controlled areas where nuclear materials are handled, with special aperture and diffraction disc selection equipment, control and analysis software.
  • WB-STEM accepts irradiation defect analysis of activated specimens from all over the world, including RPV monitoring specimens from European reactors and neutron-irradiated materials from US research reactors.
  • It is also used to analyze the properties of iron-containing nuclear fuel simulated debris in decommissioning projects.
実用化イメージ

We support research organizations that currently use transmission electron microscopy to observe microstructures to introduce the WB-STEM method by special modification. We will instruct researchers who have no experience using transmission electron microscopy in the procedure for dislocation analysis.

Researchers

Institute for Materials Research

Kenta Yoshida

[In-situ stress]

Development of the method of Baby Borehole Hydraulic Fracturing, BABHY

特徴・独自性
  • For the effective measurement of the reopening pressure in hydraulic fracturing, it is necessary to use the testing equipment with sufficiently small compliance. This limitation makes it difficult to apply the hydraulic fracturing for the measurement of the maximum stress, because the compliance of conventional equipments is generally so large. Taking account of this situation, we proposed a new concept which allows us to do the in-situ tests of hydraulic fracturing for stress measurement at so deep depths as more than 1 km. We call the concept the Baby Borehole Hydrofracturing, BABHY for short. In order to put the new concept into practice, we developed the BABHY sonde and finally we succeeded to carry out hydraulic fracturing test by using the tools in a vertical borehole of 811 m depth. We hope to conduct collaborative research with a willing company for a practical application of this technology in industry.
実用化イメージ

Researchers

Institute of Fluid Science

Takatoshi Ito

[inactivation]

Development of next-generation sterilization method by a plasma flow at atmospheric pressure

 
 
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特徴・独自性
  • Plasma sterilization has been developed as an alternative sterilization method due to its chemical activity, operation at low temperature and atmospheric pressure, low power consumption, low cost and safety. We have studied a mechanism of chemical species generation and transport in a plasma flow and, the sterilization efficacy and mechanism for several plasma sources at atmospheric pressure, such as a microwave plasma flow, a dielectric barrier discharge in a tube and a water vapor plasma flow. We already clarified that the damages of outer membrane and destructions of the cytoplasmic membrane of Escherichia coli by exposure to the microwave plasma flow. Fig. 1 shows the effect of plasma exposure on the E. coli. When the E. coli was exposed to the plasma, the height of the E. coli decreased and the potassium leakage of cytoplasmic material increased. For sterilization in a tube, we also clarified that an induced flow in the narrow tube by DBD transports chemical species and sterilize the whole inside surface of a tube as shown in Fig. 2. We hope to conduct collaborative research with a willing company for a practical application of this technology in industry.
実用化イメージ

Researchers

Institute of Fluid Science

Takehiko Sato

[incommensurate crystals]

Development of Potential Thermoelectric Materials

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特徴・独自性
  • We have been exploring novel thermoelectric materials. Functions of a solid substance primarily depend on the electronic structure, directly derived from its crystal structure. Through high-quality structure analyses using neutron and X-ray diffraction, combined with first-principles calculations, we have been fabricating materials with desired functions. To date, more than 40 novel materials have been discovered based on our guiding principles.
実用化イメージ

For developing future device technologies, challenges on thin-film thermionic multilayers and organic thermoelectric materials are currently underway.

Researchers

Graduate School of Engineering

Yuzuru Miyazaki

[India]

Religion, language, society, and life in ancient India

 
 
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特徴・独自性
実用化イメージ

Researchers

Graduate School of Arts and Letters

Naoko Nishimura

[Industrial Ecology]

Eco-Material Processing

 
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特徴・独自性
  • The major subject of our group is ferrous process metallurgy including thermodynamics of metals, alloys and molten slags, high temperature heterogeneous kinetics, phase equilibria of complex oxide systems and so on. We are interested in physic-chemical fundamentals of processing of metals, slags, scrap and waste. Recently our research interests are extended to multidisciplinary area so-called "Industrial Ecology" by the combination of process metallurgy, LCA (life cycle assessment) and social science such as econometrics.
実用化イメージ

Typically our research group is aggressively working in the area of material flow analysis of critical metals considering the quality of recycled materials. Currently our major research partners are steel and non-ferrous industries, while we do hope to collaborate with waste treatment company, mineral industry and an administrative organ.

Researchers

New Industry Creation Hatchery Center

Tetsuya Nagasaka

[information credibility analysis]

Natural Language Processing for Semantic Analysis of Big Data

 
 
 
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特徴・独自性
  • This lab conducts fundamental research for deep natural language processing (NLP) and NLP-oriented information organization such as classification, extraction, and summarization of language information. Our activities also cover a broad range of applied research including NLP-based information and knowledge mining, information credibility analysis, and resilient ICT through the maximal use of Big Data.
実用化イメージ

(i) Analysis of market trend or research trend through intelligent text mining, (ii) Discovery of potential needs and risks from opinions in social media, (iii) Management of knowledge in a company by analyzing internal documents, etc.

Researchers

Center for Language AI Research

Kentaro Inui

[Information Security]

Visual Computing with Secure ICT in the Big Data Era

 
 
 
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特徴・独自性
  • Our study focuses on sensing, processing, recognition, understanding, and analysis of enormous visual data collected in real-world environments. We have invented a set of advanced techniques of sub-pixel image analysis using phase-based image matching. Potential applications include personal recognition using various biometric traits (e.g., face, fingerprint, palm print, finger knuckle print, iris, and medical radiographs), machine vision, multi-view 3D reconstruction, image database search, and medical image computing. We are also studying fundamental techniques for building secure ICT infrastructure for the big data era; our research interests include tamper-resistant cryptographic processing and biometrics-based secure remote authentication.
実用化イメージ

We can provide collaboration and information exchange services for industries and other research organizations in the fields of image processing, computer vision, information security, biometrics, LSI design, and embedded system technologies. Many researchers and engineers from various companies, universities, and research institutions have visited our laboratory regardless of their technology fields. Our staff at the Intelligent Information System (IIS) Research Center will welcome potential collaborators: info@iisrc.ecei.tohoku.ac.jp

Researchers

Administrative Staff

Takafumi Aoki

Cyber Physical Systems Security and Its Applications

 
 
 
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特徴・独自性
  • Our study focuses on information security technologies for the next-generation ICT society fusing real-world and cyber-space computing. We are now conducting the research and development of ultra-high-speed, ultra-low power LSI computing to perform security functions such as encryption and secure computing, secure implementation technologies to protect systems from various physical attacks (attacks carried out by physical access to the system), and security optimization technologies tailored to the system usage environment and application area.
実用化イメージ

We can provide collaboration and information exchange services in the fields of information security. In particular, we have experiences of domestic/international collaborative researches on embedded security with some companies, universities, and governmental institutes.

Researchers

Research Institute of Electrical Communication

Naofumi Homma

[Informatization of Education]

ICT Use by Teachers and Students in the Classrooms of Elementary and Secondary Schools

 
 
 
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特徴・独自性
  • My research focuses on ICT use in the classrooms of elementary and secondary schools in Japan.
  • When we consider introducing technologies to the classrooms, particularly for the compulsory education in public schools, there are "inevitable issues" around consistency with the educational mission of academic development of school students, practicability and sustainability of the use of technologies for busy teachers, cost economy, and equity in the public education.
  • My research is characterized by its direction toward empirical approach to the ICT use in consideration of these issues.
  • In the past, I have been engaged in (1) a research that found the most accepted ICT among teachers was a document camera and the way teachers use it was dependent on each teacher's teaching style, (2) a research on the technology that takes fewer man-hours to develop digital textbooks and other contents, and (3) a development of e-learning materials with which elementary school students can learn key board typing.
実用化イメージ

My research can be applied to a development of teaching support tools for elementary and secondary school teachers which can be used in the classroom and a consulting service to assist development of digital teaching materials for school students.

Researchers

Graduate School of Information Sciences

Tatsuya Horita

[infrastructure]

[InGaN]

Cheaper, higher quality GaN freestanding substrates using N polarity control.

概要

Nitride semiconductor free-standing substrate production method
https://www.t-technoarch.co.jp/data/anken_en/T14-121.pdf
This invention relates to a technique for producing high-quality nitride semiconductor freestanding substrates at a lower cost. The invention also includes the use of SCAlMgO4 substrates as seed crystals. The dislocation density of nitride semiconductors on this substrate becomes lower. By controlling the crystal polarity, the crystal diameter can be expanded as well as the thickness of the nitride semiconductor.

従来技術との比較

It is possible to fabricate freestanding nitride semiconductor substrates with lower through-dislocation density than conventional substrates. Furthermore, the cleavage property of ScMgAlO4, which serves as the substrate, facilitates the exfoliation of the nitride semiconductor and reduces the cost of substrate fabrication.

特徴・独自性
  • Usage of ScAlMgO4 as a source substrate.
  • Expansion of crystal diameter by using N-polar growth
  • When ScAlMgO4 is used as the seed crystal and AlN is formed as the surface protective layer of this crystal, the surface shall be further nitrided after oxidation of the surface.
  • The main surface of the seed crystal shall be inclined 0.4 to 1.2° from the c-plane.
実用化イメージ

This invention is to provide high-quality, low-cost free-standing nitride semiconductor substrates for optical devices such as light-emitting diodes and lasers, and transistors operated under high power, high voltage, and high frequency. Companies are expected to verify the commercialization of the product.

Researchers

New Industry Creation Hatchery Center

Takashi Matsuoka

[inhibitors]

Development of the next generation anti-HIV agents

 
 
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特徴・独自性
  • HIV infection is one of most serious concern in infectious diseases. We will perform anti-HIV assays for unmet medical needs in control of HIV infections with established novel assays. We have developed reverse transcriptase inhibitor that has novel mechanism of inhibition, translocation-inhibition (J Biol Chem, 2009). Dr Kodama participated in the primary screening and development of a new HIV integrase inhibitor, elvitegravir (J Virol 2009), and a unique reverse transcriptase inhibitor, islatravir, which phase III clinical trials by the Merck & Co., Inc. will complete, soon. We have a representative resistant HIV strain-library for anti-HIV screening and several target oriented high through-put screening systems.
実用化イメージ

We can establish high through-put screening for new targets, so please consult with us individually. We are open to joint development requiring BSL3/P3 experimental facilities and academic guidance including other microorganisms.

Researchers

International Research Institute of Disaster Science

Eiichi Kodama

[InN]

Cheaper, higher quality GaN freestanding substrates using N polarity control.

概要

Nitride semiconductor free-standing substrate production method
https://www.t-technoarch.co.jp/data/anken_en/T14-121.pdf
This invention relates to a technique for producing high-quality nitride semiconductor freestanding substrates at a lower cost. The invention also includes the use of SCAlMgO4 substrates as seed crystals. The dislocation density of nitride semiconductors on this substrate becomes lower. By controlling the crystal polarity, the crystal diameter can be expanded as well as the thickness of the nitride semiconductor.

従来技術との比較

It is possible to fabricate freestanding nitride semiconductor substrates with lower through-dislocation density than conventional substrates. Furthermore, the cleavage property of ScMgAlO4, which serves as the substrate, facilitates the exfoliation of the nitride semiconductor and reduces the cost of substrate fabrication.

特徴・独自性
  • Usage of ScAlMgO4 as a source substrate.
  • Expansion of crystal diameter by using N-polar growth
  • When ScAlMgO4 is used as the seed crystal and AlN is formed as the surface protective layer of this crystal, the surface shall be further nitrided after oxidation of the surface.
  • The main surface of the seed crystal shall be inclined 0.4 to 1.2° from the c-plane.
実用化イメージ

This invention is to provide high-quality, low-cost free-standing nitride semiconductor substrates for optical devices such as light-emitting diodes and lasers, and transistors operated under high power, high voltage, and high frequency. Companies are expected to verify the commercialization of the product.

Researchers

New Industry Creation Hatchery Center

Takashi Matsuoka

[Inorganic pigments]

Colorful titanium oxide pigments without transition metals

概要

Colorful TiO2 Particle
https://www.t-technoarch.co.jp/data/anken_en/T19-849.pdf

従来技術との比較

Transition metal compounds are known to exhibit a wide variety of colors. Until now, it has been possible to color white titanium oxide by doping with transition metal ions, but it is difficult to avoid biotoxicity derived from transition metals.

特徴・独自性
  • In the present invention, titanium oxide inorganic pigments that do not contain transition metals and have various colors such as white, yellow, red, gray, green, purple, black, and skin color have been realized.
実用化イメージ

New applications of titanium oxide pigments are expected in the cosmetics field, where biotoxicity is an issue.

Researchers

Institute of Multidisciplinary Research for Advanced Materials

Yin Shu

[Input Output Analysis]

Visualization of supply chain risks from the resource logistics perspective

 
 
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特徴・独自性
  • With the increased global concerns of resource and environmental constraints of recent years, the role of mining, as a constituent of social responsibility associated with resource extraction and usage, is becoming increasingly important in the science, technology, and innovation policy. Under increasing public and shareholders' concerns of social and environmental sustainability, the fabrication industries require careful attention owing to their own risks related to the resources and materials that are used in their products and services. The Material Flow Analysis tool and Input output technique provide useful perspectives and valuable evidences for avoiding or minimizing the social and environmental risks related to the demand of resources.
実用化イメージ

Our developed model evaluates the risk weighted flow analysis by combining the resource logistics database and Global Link Input Output model. The estimated results shed light on how resource logistics prepares policy makers and R&D engineers to confront the risks behind resource usage and how the information should be shared among the stakeholders.

Researchers

Graduate School of Environmental Studies

Kazuyo Matsubae

[insects]

Lethal effects of blue light on insects

 
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特徴・独自性
  • We revealed the strong lethal effect of short-wavelength visible light (blue light: 400–500 nm) on insects. That is, we found that blue light irradiation by using a common light-emitting diode (LED) can kill the eggs, larvae, pupae, and adults of various orders of insects. Our findings will provide clean and safe pest-control technique as well as important information on the hazards of exposure to visible light.
実用化イメージ

Researchers

Graduate School of Agricultural Science

Masatoshi Hori

[Insulin]

Development of devices regulating inter-organ neural network for diabetes therapy

 
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特徴・独自性
  • Diabetes induces several complications, including retinopathy and nephropathy. In patients with type 1 diabetes as well as those with type 2 diabetes, pancreatic beta cells have reportedly decreased. Therefore, regeneration therapy of pancreatic beta cells may be very effective for major populations of diabetic patients. We discovered a neuronal network, from the liver, which selectively elicits pancreatic beta cell proliferation (Science 2008, Fig.). In a murine model with insulin-deficient diabetes, stimulation of this network improved diabetes. Thus, building devices which regulate the inter-organ neuronal network may lead to “regenerative therapy” for diabetes which regenerates pancreatic beta cells in the pancreas using patients’ own cells and patients’ own systems. We hope to conduct collaborative research with a willing company for a practical application of this technology.
実用化イメージ

Researchers

Graduate School of Medicine

Hideki Katagiri

[integrated circuit]

Hardware Development of Brain Computer and its Application to Visual Information Processing

 
 
 
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特徴・独自性
  • Toward realizing a high-performance neuromorphic vision processing system, our research involves a neural network model of spatial perception based on motion-stereo vision and its implementation on a very large scale integrated circuit (VLSI). Important parameters for spatial perception such as time-to-contact, orientation, and the shortest distance to plane surfaces of a target object are recognized by using the model without knowing moving direction and velocity of the object. We have developed a VLSI capable of performing visual perception based on the model with low power consumption, reduced less than 1/100 compared with a commercial CPU.
実用化イメージ

Targeted applications include a drone flying autonomously equipped with collision avoidance system by visual perception. Targeted industry includes infrastructure inspection, agriculture, logistics, and so on.

Researchers

Research Institute of Electrical Communication

Shigeo Sato

Spintronics device

特徴・独自性
  • To realize ultralow-power and high-performance integrated circuit and information processing, spintronics physics, material, devices are studied.
実用化イメージ

Researchers

Research Institute of Electrical Communication

Shunsuke Fukami

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