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New Research Results

Reliable transistor 07/08/2019

Development of a 1200-V-class SiC Transistor with a Built-in Schottky Barrier Diode (SBD)
– For development of a high-efficiency, high-reliability power module for hybrid electric vehicles (HEVs) and electric vehicles (EVs) –

AIST has developed a high-reliability 1200-V-class SiC transistor with a unique structure. The developed transistor has trench type gates and SBD built on a trench sidewall. The cell pitch, i.e., the spacing of the gates, was reduced to 5 µm, less than one third of the conventional pitch. Thus, the voltage applied to the PiN diodes was reduced and a high-reliability transistor that does not suffer from current degradation was developed. Its performance was verified using a mass-production-quality prototype.

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Artificial teeth 10/16/2019

Practical Use of Artificial Teeth (Dentures) Made with 3D Printing Technology
– Making it possible for digital dental manufacturing to replace conventional dental casting –

AIST and IDS Co., Ltd. have developed technology that enables the production of artificial teeth using 3D printing technology. AIST researched the microstructure of additive manufacturing material, as well as the effects of the powder size and layering direction on durability, to determine the conditions necessary for practical use. IDS Co., Ltd. obtained pharmaceutical regulatory approval of a cobalt-chrome alloy powder.

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Arterial stiffness 06/19/2019

A Long-term Follow-up Study of Individual Differences in Arterial Stiffening

AIST evaluated decadal changes in arterial stiffness of 92 volunteers by a follow-up study. It also investigated the volunteers’ specific gene polymorphisms and physical activity levels. A specific combination of the gene polymorphisms was associated with 2.4 times greater decadal increase in arterial stiffness. The decadal increase in arterial stiffness in the high-physical activity group was less than half of that in the other groups. The results are potentially useful for developing a gene marker to identify the risk of cardiovascular disease.

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Monoatomic films 10/18/2019

Development of Synthesis Technology for Various Monoatomic Films
– Contributing to the realization of new high-quality 2D materials with advanced electron microscopy technology of AIST –

AIST has developed a simple synthesis method to grow a monoatomic film of transition metal chalcogenide on a substrate. The developed synthesis method uses chemical vapor deposition. By adding salts to a transition metal source and melting it, then supplying a chalcogen source, 47 types of transition metal chalcogenide monatomic films can be synthesized.

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Motile spermatozoa 10/4/2019

Technology for Selection and Collection of Spermatozoa Advantageous for Conception Based on Swimming Pattern
– Selecting healthy spermatozoa based on their swimming pattern and fertility evaluation of cattle –

AIST has developed a motile spermatozoa selection device with microchannels. The characteristic flow created by the microchannels guides motile spermatozoa and selects spermatozoa based on their upward swimming ability. Furthermore, this technology can collect healthy spermatozoa in number applicable to artificial insemination. The developed technology is expected to contribute to improving the fertility of cattle and other livestock.

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Crustal deformation 07/26/2018

Unraveling the Mystery of Crustal Deformation of the Japanese Islands
– Movement of the Philippine Sea Plate causes the east-west contraction –

Thought experiments in combination with analogue models have elucidated the cause of the east-west contraction and crustal deformation of the Japanese islands in the Quaternary Period. It was concluded that the cause of the east-west contraction is not movement of the Pacific Plate itself, as conventionally thought, but rather movement of the Philippine Sea Plate.

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Thermoelectric module 08/02/2019

Development of a High-Power Flexible Thermoelectric Module
– Output power of 87 mW/cm2 generated at a temperature difference of 70 °C on a curved heat source –

AIST has developed a high-power flexible thermoelectric module. The developed thermoelectric material is a transition metal-doped bismuth-tellurium alloy. Thermoelectric chips were produced from an ingot of the material and a flexible thermoelectric module was built by mounting the chips at high density on a flexible substrate. The developed module allows to be adhered to heat sources with curved surfaces and can be used for a variety of power generation applications using waste heat.

Developed high-power flexible thermoelectric module

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