Skip to main content

14 Result(s)

within Ryo Toda Remove this filter

and

  1. No Access

    Article

    A Simple Experimental Setup for Simultaneous Superfluid-Response and Heat-Capacity Measurements for Helium in Confined Geometries

    Torsional oscillator (TO) is an experimental technique which is widely used to investigate superfluid responses in helium systems confined in porous materials or adsorbed on substrates. In these systems, heat ...

    Jun Usami, Ryo Toda, Sachiko Nakamura… in Journal of Low Temperature Physics (2022)

  2. Article

    Open Access

    Lung cancer CT image generation from a free-form sketch using style-based pix2pix for data augmentation

    Artificial intelligence (AI) applications in medical imaging continue facing the difficulty in collecting and using large datasets. One method proposed for solving this problem is data augmentation using ficti...

    Ryo Toda, Atsushi Teramoto, Masashi Kondo, Kazuyoshi Imaizumi… in Scientific Reports (2022)

    Download PDF (1670 KB) View Article

  3. No Access

    Article

    Synthetic CT image generation of shape-controlled lung cancer using semi-conditional InfoGAN and its applicability for type classification

    In recent years, convolutional neural network (CNN), an artificial intelligence technology with superior image recognition, has become increasingly popular and frequently used for classification tasks in medic...

    Ryo Toda, Atsushi Teramoto… in International Journal of Computer Assisted… (2021)

  4. No Access

    Article

    Characterization of Pyrolytic Graphite Sheet: A New Type of Adsorption Substrate for Studies of Superfluid Thin Films

    We have measured the surface morphology and gas adsorption characteristics of an uncompressed pyrolytic graphite sheet (uPGS) which is a candidate substrate for AC and DC superflow experiments on monolayers of ...

    Sachiko Nakamura, Daisuke Miyafuji, Ryo Toda… in Journal of Low Temperature Physics (2018)

  5. No Access

    Article

    Quantum States of Helium Atoms Confined in Nanocage in Na-Y Zeolite

    We have studied the heat capacities of heliums adsorbed in Na-Y zeolite down to 70 mK. The Y-type zeolite has void cages 1.3 nm in diameter connected through narrow apertures 0.8 nm in diameter. In the nanopor...

    Taku Matsushita, Ryo Toda, Mitsunori Hieda… in Journal of Low Temperature Physics (2010)

  6. No Access

    Article

    Vortex Diffusivity and Core Diameter of 2D Superfluid in 4He Films on Gold and H2 Substrates

    The two-dimensional (2D) 4He fluid films show the Kosterlitz-Thouless (KT) transition where pairing and unpairing of the 2D vortices play an important role. However, the vortex properties (the diffusion constant

    Takuya Oda, Mitsunori Hieda, Ryo Toda… in Journal of Low Temperature Physics (2010)

  7. No Access

    Article

    Helium Film Formed in 1.2 nm Pore in Zeolite Templated Carbon

    We have measured the vapor pressure of 4He adsorbed in zeolite templated carbon (ZTC) at 4.2 K, in order to examine 4He film growth in the nanopore. ZTC has a framework made of non-stacked graphene, and has a rel...

    Yusuke Kinosita, Ryo Toda, Taku Matsushita… in Journal of Low Temperature Physics (2010)

  8. Article

    Open Access

    Fluid States of Helium Adsorbed in Nanopores

    We have studied helium adsorbed in new nanopores which have regular structures from nano-cage to three-dimensionally (3D) connected pores. Adsorption potential and layer formation of the adsorbed helium are ob...

    Nobuo Wada, Taku Matsushita, Mitsunori Hieda… in Journal of Low Temperature Physics (2009)

    Download PDF (3209 KB)

  9. No Access

    Article

    One-Dimensional Phonon State of 4He Films Adsorbed in Straight Nanopores

    We have studied heat capacities of 4He adsorbed in straight nanopores 1.8, 2.2, and 2.8 nm in diameter. Heat capacities of the 4He fluid film on the solid layer at 0.08–0.4 K show power laws close to T in 1.8 nm...

    Yuki Matsushita, Junko Taniguchi, Ryo Toda… in Journal of Low Temperature Physics (2008)

  10. No Access

    Article

    Possible 3He Boltzmann Gas Formed on Three-Dimensional Nanopores Preplated with 4He

    We have measured the heat capacity of 3He adsorbed on three-dimensionally connected nanopores, 2.7 nm in diameter, preplated with about 1.3 atomic layers of 4He. At low coverages of 3He, the 3He heat capacity is...

    Ryo Toda, Yuki Matsushita, Mitsunori Hieda… in Journal of Low Temperature Physics (2007)

  11. No Access

    Article

    Production of 2n pollen of Asiatic hybrid lilies by nitrous oxide treatment

    Tetraploid varieties of lilies have superior agronomic traits such as large flowers and resistance to physiological disorders. In the present study, we attempted to induce 2n pollen of Asiatic hybrid lilies by ar...

    Masako Akutsu, Satomi Kitamura, Ryo Toda, Ichiro Miyajima, Keiichi Okazaki in Euphytica (2007)

  12. No Access

    Article

    Influence of Adsorption Potential on 3He Fluid States Formed on 4He-Preplated Substrates

    From heat capacity measurements for 3He adsorbed on 4He-preplated mesopore in substrates, FSM-16, HMM-2, and Hectorite, we found fluid states of the 3He adatoms. At very dilute 3He densities, however, it strongly...

    Taku Matsushita, Ryo Toda, Junko Taniguchi… in Journal of Low Temperature Physics (2005)

  13. No Access

    Article

    Adsorption Potentials and Film Growths of 4He in Nanometer Pores of FSM-16 (2.8 nm) and HMM-2 (2.7 nm)

    To find the one- and the three-dimensionalities for the superfluid onset of the 4He films formed in nanopores, we have been studying 4He adsorbed on FSM-16 and HMM-2 that have pores of almost the same diameter, 2...

    Ryo Toda, Junko Taniguchi, Ryota Asano… in Journal of Low Temperature Physics (2005)

  14. No Access

    Article

    Superfluid State of 4He Films Adsorbed on 27 Å Pores in HMM-2

    We have measured the superfluid density ρ s of 4He films adsorbed on the porous material HMM-2 by a torsional oscillator. The substrate has pores of 27 Å in diameter with ordered three-dimensional connectivity. ρ

    Tomoya Yamada, Ryo Toda, Yuki Matsushita… in Journal of Low Temperature Physics (2004)