Satoshi Takahashi

Okayama University

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Jiajia Yang

Okayama University

Jinglong Wu

Beijing Institute of Technology

Yoshimichi Ejima

Okayama University

Qiong Wu

Okayama University

Seiichi WASHIO

Okayama University

Jinglong Wu

Beijing Institute of Technology

Masahide Tona

Fukuda Denshi (Japan)

Nobuyuki Nakamura

University of Electro-Communications

Weiping Yang

Hubei University

Nobuo Yoshiyasu

University of Electro-Communications

Cooperative Institutions

Center for Special Minimally Invasive and Robotic Surgery

244

Robotic Technology (United States)

244

Liuyang City Maternal and Child Health Hospital

224

Robotic Research (United States)

224

Azur Space Solar Power

198

Japan Atomic Energy Agency

171

Okayama University

136

Advanced Science Research Center

131

Chinese Academy of Sciences

RobotSystem (Czechia)

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Generation and Observation of Tensile Waves in Oil Columns.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B (1992)

Seiichi WASHIO Satoshi Takahashi Tadataka KONISHI Hitoshi Moriwake

Tensile stresses in liquids are not necessarily a familiar idea in fluid engineering, so much less accepted is the reality of tensile waves travelling through a liquid continuum. The present paper aims at giving evident proof for the premise. In a pipe with its end closed, branching from the main line where column separation is started, alternating tensile and compressive waves have been beautifully created and measured. It has turned out that the ordinary viscous wave equation can properly predict the time profiles of the masured pressures, which reveals that a tensile wave propagates in oil at the same speed as a compressive one. The observations by use of a transparent acrylic tube have also revealed the rupturing of an oil column under an excessive transient tensile stress; in the aftermath there has emerged a bubble which is usually mistaken for the cause of cavitation, but is actually brought about by diffusive separation of gas from the oil into the rupture.

10.1299/kikaib.58.779

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Citations (0)

Near-field second-harmonic generation at a metal tip apex

Applied Physics Letters (2002)

Satoshi Takahashi Anatoly V. Zayats

Second-harmonic generation at a gold tip apex has been studied within the context of applications in apertureless scanning near-field microscopy. Polarization and distance dependencies of second-harmonic generation have been investigated and compared to respective dependencies for scattered fundamental light. The results shows that, in general, different topological features of a tip are responsible for scattering and second-harmonic generation in the far and near field. The near-field interaction between a probe tip and a surface significantly modifies enhancement of the electromagnetic field at the tip and results in different distance dependencies of near-field scattering and second-harmonic generation. The polarization contrast obtained with the second-harmonic signal significantly exceeds the polarization contrast of linear scattering from the tip.

Second-harmonic imaging microscopy

Harmonic

10.1063/1.1478780

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Citations (46)

Audiovisual Integration Delayed by Stimulus Onset Asynchrony Between Auditory and Visual Stimuli in Older Adults

Perception (2016)

Yanna Ren Weiping Yang Kohei Nakahashi Satoshi Takahashi Jinglong Wu

Although neuronal studies have shown that audiovisual integration is regulated by temporal factors, there is still little knowledge about the impact of temporal factors on audiovisual integration in older adults. To clarify how stimulus onset asynchrony (SOA) between auditory and visual stimuli modulates age-related audiovisual integration, 20 younger adults (21-24 years) and 20 older adults (61-80 years) were instructed to perform an auditory or visual stimuli discrimination experiment. The results showed that in younger adults, audiovisual integration was altered from an enhancement (AV, A ± 50 V) to a depression (A ± 150 V). In older adults, the alterative pattern was similar to that for younger adults with the expansion of SOA; however, older adults showed significantly delayed onset for the time-window-of-integration and peak latency in all conditions, which further demonstrated that audiovisual integration was delayed more severely with the expansion of SOA, especially in the peak latency for V-preceded-A conditions in older adults. Our study suggested that audiovisual facilitative integration occurs only within a certain SOA range (e.g., -50 to 50 ms) in both younger and older adults. Moreover, our results confirm that the response for older adults was slowed and provided empirical evidence that integration ability is much more sensitive to the temporal alignment of audiovisual stimuli in older adults.

Stimulus (psychology)

Stimulus onset asynchrony

Asynchrony (computer programming)

Auditory stimuli

10.1177/0301006616673850

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Citations (36)

PTCR characteristics in undoped barium titanate ceramics with core-shell type duplex microstructures

M. Kuwabara Eiji Matsuyama Satoshi Takahashi Hirokazu Shimooka Yoshiki Urakawa

Undoped barium titanate ceramics exhibiting a distinct positive temperature coefficient of resistivity (PTCR) effect have been produced by sintering high-purity barium titanate powder compacts in the temperature range 1300-1400/spl deg/C in air. The formation of core-shell type duplex microstructures in the materials covered with a nearly full dense layer is responsible for this phenomenon, where undoped barium titanate ceramics (which are normally insulating) were converted to semiconductors and, moreover, exhibited distinct PTCR effects. The core-shell grain structure is described as a duplex microstructure consisting of a large-grained (/spl ap/50 /spl mu/m) semiconducting phase inside and a small-grained (<10 /spl mu/m) insulating phase outside.

Barium titanate

Temperature coefficient

Barium

10.1109/isaf.1994.522481

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Citations (3)

Visual Orientation Sequence Task enhances Working Memory in Younger and Older Adults

2022 IEEE International Conference on Mechatronics and Automation (ICMA) (2020)

Ting Guo Yanna Ren Yinghua Yu Yiyang Yu Seongyeol Yun

Working memory is an important component of higher-order cognitive processes which are negatively impacted by aging effects. Recent researches have shown that plentiful behavioral training had positive impact on working memory. However, it remains difficult to achieve significant training results and thus improve the ability of working memory and general cognitive function for older adults who was suffered with cognitive decline. Based on this premise, our study aims to compare the working memory training effects in younger and older participants, and hopes to found reliable ways to improve training effects for older and cognitive ability-damaged subjects. To achieve this purpose, we recruited 42 younger (12 men, 4 women; mean age: 25.4 years) and older adults (12 men, 12 women; mean age: 69.9 years) who were divided into two subgroups randomly to participate the current experiment. We executed a visual orientation discrimination task and a modified visual orientation sequence tasks to train the visual working memory for all participants, and evaluated the training effects by comparing results of the same pre and posttests. Our results showed that both younger and older participants could benefit from the designed training tasks. These findings indicated the robust plasticity of working memory even in aging brain, and our results further suggest that more effective training gains could be achieved by adjusting the difficulty of training task for participants with different cognitive ability.

Cognitive Training

10.1109/icma49215.2020.9233631

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Absent Audiovisual Integration Elicited by Peripheral Stimuli in Parkinson’s Disease

Parkinson s Disease (2018)

Yanna Ren Keisuke Suzuki Weiping Yang Yanling Ren Fengxia Wu

The basal ganglia, which have been shown to be a significant multisensory hub, are disordered in Parkinson’s disease (PD). This study was to investigate the audiovisual integration of peripheral stimuli in PD patients with/without sleep disturbances. Thirty-six age-matched normal controls (NC) and 30 PD patients were recruited for an auditory/visual discrimination experiment. The mean response times for each participant were analyzed using repeated measures ANOVA and race model. The results showed that the response to all stimuli was significantly delayed for PD compared to NC (allp<0.01). The response to audiovisual stimuli was significantly faster than that to unimodal stimuli in both NC and PD (p<0.001). Additionally, audiovisual integration was absent in PD; however, it did occur in NC. Further analysis showed that there was no significant audiovisual integration in PD with/without cognitive impairment or in PD with/without sleep disturbances. Furthermore, audiovisual facilitation was not associated with Hoehn and Yahr stage, disease duration, or the presence of sleep disturbances (allp>0.05). The current results showed that audiovisual multisensory integration for peripheral stimuli is absent in PD regardless of sleep disturbances and further suggested the abnormal audiovisual integration might be a potential early manifestation of PD.

10.1155/2018/1648017

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Citations (11)

A New Analysis of Minor Hysteresis Loops and QNDE

AIP conference proceedings (2005)

Satoshi Takahashi

A new analysis of minor hysteresis loops is introduced in Fe single crystals with plastic deformation that can be applied to the non‐destructive evaluation of degradation in ferromagnetic materials. In the analysis four parameters are found to be sensitive to dislocations and they are independent of the magnetic field amplitude Ha. The new parameters contain much more information about lattice defects such as dislocations. Their sensitivity is higher than the coercive force.

Hysteresis

Minor (academic)

Lattice (music)

10.1063/1.1916819

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Citations (3)

Performance of NiO/MgFe2O4 composite cathode for a molten carbonate fuel cell

Journal of Power Sources (2004)

Hajime Okawa J.-H. Lee Tadashi Hotta Satoshi Ohara Satoshi Takahashi

Non-blocking I/O

10.1016/j.jpowsour.2003.11.092

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Citations (40)

G305 Observation of flow structure around the separation point using PIV method

Ryuutai Kougaku Bumon Kouenkai kouen rombunshuu/Ryutai Kogaku Bumon Koenkai koen ronbunshu (2007)

Satoshi Takahashi Seiichi WASHIO Toshihiro Ogata

Separation (statistics)

10.1299/jsmefed.2007._g305-1_

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Planar chiral meta-materials: controlling the polarization state of light in the far- and near- field

Darren M. Bagnall A. Papakostas A. Polls S. L. Prosvirnin Satoshi Takahashi

We have extended our research to the study of near-field polarization effects arising from the planar chirality. The interaction between the neighboring elements in a metallic structure can be visualized with near-field measurements. Coupling between metallic gammadions that gives rise to the scattered electromagnetic field with polarization components different from the polarization state of the incident light can be directly identified. We have also investigated far-field effects in two-dimensional gratings consisting of regular patterns of dielectric gammadions on a silicon substrate.

Planar chirality

10.1109/cleoe.2003.1313744

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