"C" Keywords - 110 Result(s)

 C

[crystal growth]

High-Temperature Processes and Measurements of Materials

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特徴・独自性
  • Fukuyama laboratory studies novel material processing based on chemical thermodynamics with high-temperature thermophysical property measurements. As examples, we are developing new crystal growth processes to bring a breakthrough in nitride-semiconductor devices, which are promising materials for next-generation optical devices applied in environmental, medical, bio and information technologies fields. Database of thermophysical properties of materials is needed for modeling heat and mass transports in materials processes.
実用化イメージ

A new thermophysical property measurement system is currently under development, which enables accurate measurements of heat capacity, thermal conductivity, emissivity, density and surface tension of high-temperature melts, utilizing electromagnetic levitation in a dc magnetic field.

Researchers

Institute of Multidisciplinary Research for Advanced Materials

Hiroyuki Fukuyama

[crystal structure]

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

[crystallinity]

Extraction of cellulose nanofibers (CNFs) from sea pineapples' shells and application for energy materials

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概要

The sea pineapple is the only animal that produces cellulose, and its shells, excluding the edible parts, are treated as industrial waste. By removing proteins and other components from the sea squirt shells and fibrillating them, cellulose nanofibers (CNFs) can be extracted. We have focused on the fact that CNFs derived from sea squirt shells have a higher degree of crystallinity and greater mechanical strength compared to those from wood, and we are exploring various applications of this material. Furthermore, since the material transforms into high-quality carbon upon calcination, we successfully developed "nano-blood carbon catalysts" by mixing it with dried blood powder and calcining the mixture. These catalysts are being applied in fuel cells, water electrolysis, and metal-air batteries.

従来技術との比較

CNFs derived from sea pineapple's shells have a higher degree of crystallinity compared to those from wood and provide longer fibers, resulting in high strength. When calcined, they transform into high-performance carbon.

特徴・独自性
  • We are the only research laboratory that has consistently developed a process for the simple and large-scale purification of CNFs derived from sea pineapple's shells, along with the creation of film materials that leverage their unique properties (mechanical, engineering, surface science, electrical, and thermal characteristics), as well as the development of carbonized materials.
実用化イメージ

We offer materials derived from sea pineapples' shell CNFs, as well as their carbonized products and catalysts. Please feel free to consult us regarding material supply, carbonization processes, or the utilization of catalysts.

Researchers

Advanced Institute for Materials Research

Hiroshi Yabu

[crystallization]

Study on Phase Change Materials for PCRAM Application

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特徴・独自性
  • Phase change random access memory (PCRAM) has attracted attention as next-generation non-volatile memories. A conventional PCM is Ge-Sb-Te which shows a fast crystallization speed and an excellent reversibility of phase transition. However, Ge-Sb-Te has a low crystallization temperature of about 150 ºC and a high melting temperature of over 600 ºC , which limits data retention and causes high power consumption, respectively.
  • We have developed a new phase change materials with high crystallization temperature and low melting point such as Ge-Cu-Te etc, which have high potential as PCRAM materials with high thermal stability and low power consumption (Fig.1,2).
実用化イメージ

Our materials are developed for PCRAM, DVD recording materials etc. We hope the collaboration research with companies which are interested in our developed phase change materials.

Researchers

Graduate School of Engineering

Yuji Suto

[CT]

X-Ray Phase Imaging for High-Sensitive Non-Destructive Testing

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特徴・独自性
  • Conventional X-ray imaging methods that rely on X-ray attenuation cannot generate clear contrast in the observation of low-density materials such as polymers consisting of low-Z elements. However, the sensitivity to the materials can be improved drastically by X-ray phase imaging that detects X-ray refraction caused by the materials. X-ray Talbot or Talbot-Lau interferometry consisting of X-ray transmission gratings is now constructed in laboratories for X-ray phase imaging. X-ray phase tomography is also realized, enabling high-sensitive three-dimensional observation.
  • X-ray phase imaging can be utilized for X-ray non-destructive testing of industrial products and baggage that cannot be checked conventionally.
実用化イメージ

We aim at appending a phase-contrast mode to micro-CT apparatuses and developing screening apparatuses in production lines.

Researchers

Institute of Multidisciplinary Research for Advanced Materials

Atsushi Momose

High-speed X-ray phase tomography with a millisecond-order temporal resolution

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特徴・独自性
  • We successfully realized millisecond-order X-ray phase tomography using a fringe-scanning method in grating-based X-ray interferometry. We obtained phase tomograms with a measurement time of 4.43 ms using a white synchrotron X-ray beam. The use of a fringe-scanning method enables us to achieve not only a higher spatial resolution but also a higher signal-to-noise ratio than that attained by the Fourier transform method. In addition, our approach can be applied to realize four-dimensional or high-throughput X-ray tomography for samples that can be rotated at a high speed.
実用化イメージ

Researchers

International Center for Synchrotron Radiation Innovation Smart

Wataru Yashiro

[Current-mode logic]

High-speed and low-power asynchronous Network-on-Chip system based multiple-valued current-mode logic

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特徴・独自性
  • Global intra-chip interconnection complexity not only limits the clock frequency, but causes clock-skew problems in synchronous system. Asynchronous control-based circuit design, where timing is managed locally, is one of the possible approaches to solve the above serious interconnection problem because the asynchronous design has many features which are low power dissipation, high speed and robustness. However, communication-steps overhead caused by handshaking much would generally affect the cycle time.
  • In our approach, a high-speed asynchronous data-transfer scheme is proposed based on multiple-valued encoding and current-mode circuits. The multiple-valued encoding enables to improve communication protocol essentially. Moreover, the current-mode circuits which has high-driving capability makes it possible to perform high-speed intra- and inter-chip network. By using this method, we expect that we can conduct effective collaborative research in high-speed and low-power communication LSIs such as a many-core LSI and a multi-module NoC.
実用化イメージ

Researchers

Research Institute of Electrical Communication

Takahiro Hanyu

[Cutting]

Joule Heat Welding of Ultrathin Metallic Wires and its Application for Producing Functionality

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特徴・独自性
  • For producing a new functionality from metallic micro and nano matarials, the welding and cutting technologies for small scale materials utilizing Joule heat has been developed (Fig. 1). A constant direct current is supplied to the system, where the free ends of two metallic wires are contacted, and the ends are successfully welded together in self-completed manner. This technology is also useful for manipulating a small scale materials.
実用化イメージ

Joule heat welding technology enables us to produce the functional elements on the electrode chips, e.g., a free-standing micro-ring and very-thin thermoelectric element (Fig. 2). Moreover, we have developed the technique for characterizing the physical properties of small scale materials (Fig. 3). We hope to conduct collaborative research with a willing company for a practical application of this technology in industry.

Researchers

Graduate School of Engineering

Hironori Tohmyoh

[cyclodepsipeptides]

Synthesis of Biologically Active Cyclodepsipeptide Natural Products

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特徴・独自性
  • Cyclodepsipeptide natural products include optically active hydroxy acids as well as various unnatural amino acids and exhibit a variety of biological activity depending on the peptide sequence, chirality, and selection of the hydroxy acids. Structure-activity relationships of a synthetic library of natural products could give us significant information of not only biologically important moieties but also intact positions in the biologically active small molecules. On the basis of the former information, more potent compounds and/or peptide mimetics can be designed. The latter information can also be important for making a molecular probe that is used for exploration of a target molecule.
実用化イメージ

We study for combinatorial synthesis of natural product analogues using solid-phase.

Researchers

Graduate School of Pharmaceutical Sciences

Takayuki Doi

[Cyclotron]

Development of the cyclotron accelerator and its application

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特徴・独自性
  • We develop technology of the cyclotron accelerator and its application as follows. 1)Ion source (particularly heavy ion source), 2)design of ion optics, 3)device control system for the cyclotron, 4)RF system, 5)detectors for charged particles, gamma ray, and neutron, 6) radiation test by ion and neutron beam.
実用化イメージ

We have beam lines dedicated to the neutron irradiation and the ion irradiation, respectively. We can provide fast neutron beam (20-70 MeV), and various ion beam such as p, alpha, and heavy ions up to Xe. We also develop a neutron imaging technique using fast neutron.

Researchers

Research Center for Accelerator and Radioisotope Science

Masatoshi Itoh