Research Profiles

JP

"T" Keywords - 48 Result(s)

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 T

[tribology]

Development of a Numerical Prediction System for Sliding Part Wear and Seizure Occurrence Portions

 
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概要

Focusing on the lubricant film flow with phase change between the engine piston pin and connecting rod small end, we developed a new multiphase fluid-structure coupled analysis method that takes into account elastic deformation of the structure and flow path changes and developed a simulation prediction method for tribological properties under high load conditions. The simulation prediction method for tribological properties under high load conditions has been created. As a result, we succeeded in simulation prediction of the wear/seizure generating areas in sliding parts. We discovered that the peculiar deformation behavior of the components is the cause of wear/seizure.

従来技術との比較

It has been thought that computational prediction is impossible to verify the wear and seizure locations in fluid lubrication. Still, this study succeeded in the simulation prediction of wear and seizure locations in sliding parts.

特徴・独自性
  • Numerical prediction of the wear and seizure locations in the sliding parts of engine piston pins was successfully performed.
  • The bow-like deformation of the piston pin was identified as the cause of mechanical contact and seizure at the connecting rod edge.
  • A three-dimensional multiphase fluid-structure coupled analysis method has been successfully developed, considering the piston pin's elastic deformation and connecting rod and thin-film cavitation1 lubrication with unsteady flow path changes.
実用化イメージ

This research method applies to automotive engines and all sliding component elements using fluid lubrication. It contributes to damage prediction and the development of safety guidelines for transportation and industrial machinery components, enabling the optimal design of components.

Researchers

Institute of Fluid Science

Jun Ishimoto

[Truku]

Universal Design in Language Use

 
 
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概要

My current research topic is "universal design in language use," with special reference to order in language and thought. In particular, I am investigating (1) similarities and differences in neural processing of languages with different basic word orders, (2) to what extent the order in non-verbal thought is affected by the order in language, and vice versa, and (3) what is the optimal order in human language and human thought, if any.

従来技術との比較

Many studies have reported that subject-object (SO) word order, where the subject (S) precedes the object (O), tends to have lower processing costs and is preferred by native speakers compared to object-subject (OS) word order. However, traditional studies have primarily focused on SO languages, such as Japanese and English, where SO word order is the grammatical default. As a result, it remains unclear whether the preference for SO word order reflects the basic word order of individual languages or more universal cognitive characteristics of humans.

特徴・独自性
  • To address this, we are conducting research on the cognitive processing of minority languages that use object-subject (OS) word order as their basic word order—specifically Kaqchikel and Truku, which have not been studied before. This research focuses on the relationship between “word order in language” and “order of thought.” The findings are then compared to the cognitive processing of Japanese and English.
  • For this purpose, experimental equipment is brought to the speakers’ regions (Guatemala and Taiwan) to conduct a variety of investigations and experiments, including behavioral experiments, eye-tracking, and brain function measurements. Additionally, for experiments requiring large, non-portable equipment such as MRI scanners, the speakers are invited to Japan for the studies.
実用化イメージ

Although I am conducting basic research, I believe it helps develop (1) effective language teaching/learning methods, (2) rehabilitation programs for aphasia, (3) dynamic preservation of endangered languages/dialects, and so on.

Researchers

Graduate School of Arts and Letters

Masatoshi Koizumi

[Tsunami]

[Tsunami Engineering]

[tumor-specific]

Production of Tumor-Specific Monoclonal Antibodies

 
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特徴・独自性
  • Podoplanin (PDPN/Aggrus/T1α), a platelet aggregation-inducing mucin-like sialoglycoprotein, is highly expressed in many cancers and normal tissues. A neutralizing monoclonal antibody (mAb; NZ-1) can block the association between podoplanin and C-type lectin-like receptor-2 (CLEC-2) and inhibit podoplanin-induced cancer metastasis, but NZ-1 reacts with podoplanin-expressing normal cells such as lymphatic endothelial cells. Recently, we established a platform to produce cancer-specific mAbs (CasMabs). The newly established LpMab-2 mAb reacted with podoplanin-expressing cancer cells but not with normal cells, as shown by flow cytometry and immunohistochemistry; therefore, LpMab-2 is an anti-podoplanin CasMab that is expected to be useful for molecular targeting therapy against podoplanin-expressing cancers.
実用化イメージ

We can produce cancer-specific mAbs (CasMabs) against all membranous proteins. CasMabs are expected to be useful for molecular targeting therapy without side effects.

Researchers

Graduate School of Medicine

Yukinari Kato

[tunnel magnetoresistance]

Development of High Sensitive Magnetic Sensor Operating at Room Temperature with Tunnel Magnetoresistance Devices

 
 
 
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特徴・独自性
  • Recently, many tunnel magnetoresistance devices with high magnetoresistance effect are reported. These are expected to be applied to high sensitive magnetic sensors. There are many magnetic sensors with variety of the mechanism, in order to meet the demand of the very wide range of sensing magnetic field. However, there is no magnetic sensor which has high sensitivity, easy to use, operation at room temperature and low cost. Only a magnetic sensor with tunnel magnetoresistance devices can satisfy all the demand in principle. As the device has very wide range of the sensing magnetic field, it can be designed for any demand to the sensors.
実用化イメージ

For example, this device can sense a bio-magnetic field easily at room temperature, so that it could be replaced SQUID device, which is popular now but is very expensive and not easy to use personally. Therefore, by using this device, we expect we can conduct effective collaborative research in medical field.

Researchers

Graduate School of Engineering

Yasuo Ando

[Two-dimensional system]

Transport Control of Semiconductor Quantum Structures and Highly Sensitive NMR

 
 
 
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特徴・独自性
  • Highly-sensitive NMR technique has been developed by manipulation polarization of nuclear spins via control of transport characteristics in GaAs and InSb quantum structures. This highly-sensitive NMR can be applied to two-dimensional and nanostructures. Furthermore, ideal gate controllability has been demonstrated in InSb quantum structures with Al2 O3 dielectrics. More importantly, the concept of generalized coherence time was introduced, where noise characteristics felt by nuclear spins can be measured including their frequency dependence. This concept will bring about a change in all nuclear-spin related measurements.
実用化イメージ

Next generation InSb devices based on good gate controllability. Various nuclear-spin based measurements and NMR utilizing the concept of generalized coherence time. Highly-sensitive NMR is now important for fundamental physics studies. In the future, it will contribute to quantum information processing.

Researchers

Center for Science and Innovation in Spintronics

Yoshiro Hirayama

[tyhoon]

Prediction and evaluation of future thermal and wind environments based on CFD, and planning of urban environments adaptable to future climate

 
 
 
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特徴・独自性
  • Numerical simulations of the physical environment of urban outdoor spaces are conducted to predict the physical environment, such as temperature, humidity, wind, and pollutant concentration, and field measurements are conducted to understand the actual physical environment. In addition, the future outdoor environments and heat stroke risks due to global warming are predicted and evaluated.
    Furthermore, the impacts of urban morphology (building shape and layout, street trees, etc.) on the adaptation to severe heat in summer and rare typhoons and floods are evaluated quantitatively.
実用化イメージ

Numerical analysis is used to quantitatively evaluate the "merits and demerits" of designing buildings, planning city blocks and urban areas, and introducing various heat control technologies on the wider thermal environment and the formation of wind ventilation paths, as well as the adverse effects of typhoons and other disasters. The materials for making decisions on whether or not to introduce these technologies are provided.

Researchers

Graduate School of Engineering

Yasuyuki Ishida

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