Yutaka Ito

Ijinkai Takeda General Hospital

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[A study of how to distinguish the side on which TMJ noise is occurring].

PubMed (1990)

Kenji Hashimoto S Takehana Yutaka Ito Mikihito Takenaka Nobuhiro Suzuki

Many patients with TMJ dysfunction suffer from TMJ noise. The measurement of TMJ noise is an important factor in assessing the state of the TMJ dysfunction. Consequently we measured the TMJ noise using electrical techniques in order to make an accurate record. However, determining the side on which the noise occurs is not always easy in auscultation or when picking up the noise electrically, because the sound is carried across the bony structure and picked up on both sides. To solve this problem, we used a three-directional accelerometer, measuring the sound on both sides in the hope that a difference in measurements would allow us to identify the side of the noise. In this study, we vibrated one side of the TMJ with pulse waves, and we compared the vibrated side to the unvibrated side. The height of the pulses was held at 4 volts. In addition, we changed the rising time from 0 volt to 4 volts within a range of 0.6-2.0 msec. The following results were obtained. 1. The time difference between the peaks of the three directions was from 0.32 msec to 3.22 msec on the vibrated side, and from 2.92 msec to 18.2 msec on the unvibrated side. 2. Whenever the time was increased within the selected range, the time difference between the peaks of the three directions on the vibrated side was shorter than that on the unvibrated side. 3. These results suggest that the use of a three-directional accelerometer is a reliable method of distinguishing on which side the TMJ noise is occurring.

Volt

Source

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Citations (2)

Investigation of Single Ammonia Droplet Evaporation Characteristics Under High Temperature and Pressure Conditions

L.S. Khuong Nozomu Hashimoto Yutaka Ito Nakamichi Nobuto Y. Konno

10.2139/ssrn.5146398

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Citations (0)

Thermodynamic Effect on Backflow Vortex Cavitation

53rd AIAA Aerospace Sciences Meeting (2015)

Atsuhiro Tsunoda Yutaka Ito Naoki Tani Takao Nagasaki

An experimental apparatus was developed to visualize a rotating inducer with speeds of 0 to 8000 rpm. The transparent casing outside the inducer was made of quartz glass, so that tip clearance remained almost constant. All other key parts were chosen based on their suitability for both cryogen and water. Backflow vortex cavitation on a rotating inducer was observed in either liquid nitrogen or water. Consequently, the orbital rotational rate, the orbital rotational diameter, and the diameter of each backflow vortex cavitation should be sorted by head coefficient. Further, thermodynamic effects were observed for the diameter of each backflow vortex cavitation.

Backflow

10.2514/6.2015-0471

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Citations (1)

The applications of virtual reality for interdisciplinary planning

WIT transactions on the built environment (2009)

T H Lorentzen Yasunobu Kobayashi Yutaka Ito

This paper evaluates virtual reality (VR) model implementations on their ability to inform and engage interdisciplinary groups in transportation planning.First we present a VR simulation system used by engineers and planners to share proposals and work with members of the public.The system consists of several elements: real-time simulation software for visualization, motion and audio hardware systems that allow users to take a driver's perspective, and output methods for presentation and collaboration.Applications are then described, including: visualizations of a new LRT system in Sakai City, Japan; simulations for road design in Busan, Korea, and Fukui, Japan; and an urban planning model of Phoenix, USA.These case studies are evaluated, and it is concluded that optimal implementation involves 1) structured integration of the VR model within the project planning framework, and 2) interactive presentation methods.

Implementation

Presentation (obstetrics)

10.2495/ut090191

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Direct dark matter search with a cryogenic detector.

M. Minowa Michiaki Sakamoto Yutaka Ito W. Ootani T. Watanabe

Source

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Performance and Heat Transfer Characteristics of a Latent Heat Storage Unit with Finned Tubes: Experimental Study on Liquefaction of LNG Boil-off Gas by Melting n-Pentane as a Phase-change Material

KAGAKU KOGAKU RONBUNSHU (2004)

Yoshihiko YAMASHITA Yushi Hirata Yukio Iwata Kiyoshi YAMAZAKI Yutaka Ito

LNGガス化プロセスに蓄冷システムを適用すると, 日内や季節内のガス供給量の変動に伴う冷熱発生量の変動が平準化され, LNG冷熱利用の促進を図ることができる. 本研究では, 蓄冷システムを適用したボイルオフガス再液化プロセスを実用化するため, 実用プラントと同規模の伝熱管長を有するフィンチューブ型潜熱蓄冷装置を用いて, 蓄冷材 (Phase-Change Material) 融解過程におけるLNG二相流の液化実験を行い, 蓄冷装置の性能とフィンチューブ周りの伝熱特性を調査した. 実験の結果, フィンチューブ内外におけるLNGとPCMの相変化挙動が明らかになった. また, 蓄冷装置の液化時間は, 装置負荷とほぼ反比例の関係にあるが, 負荷の増加に伴って装置出口近くに残存するPCM固相量が増加するため, 減少することがわかった. さらに, PCM融解過程におけるフィンチューブ周りの熱コンダクタンスが既存の伝熱式を用いて推定できることがわかった.

Pentane

Liquefied natural gas

Phase-change material

Heat transfer fluid

10.1252/kakoronbunshu.30.399

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Citations (4)

Pilot study of the short-term effects of range-of-motion exercise for the temporomandibular joint in patients with temporomandibular joint disc displacement without reduction

Journal of Physical Therapy Science (2017)

Shigemitsu Sakuma Yoshihiro Yamaguchi Nozomu TAGUCHI Nobumi Ogi Kenichi Kurita

[Purpose] This study investigated the effectiveness of a short-term exercise program combining range-of-motion exercise for the temporomandibular joint and self-traction therapy in patients with temporomandibular joint disc displacement without reduction. [Subjects and Methods] The study participants comprised 36 females with jaw trismus and moderate to severe functional pain. The range-of-motion exercise for the temporomandibular joint was performed at the first visit by the therapist, and the patients were instructed to perform self-traction therapy in the morning and during daily bathing until the next visit 2 weeks later. Maximum mouth opening distance and the visual analogue scale score were used to compare pain on motion and mastication as well as the impact of the program on daily activities at the first consultation and 2 weeks later. [Results] All symptoms were significantly improved after 2 weeks of treatment. [Conclusion] A program that combines exercise for the temporomandibular joint and self-traction therapy can improve range of motion at the joint in the short term and reduce pain and difficulty associated with daily activity in patients with temporomandibular joint disc displacement without reduction. The results of this study suggest that such a program can serve as an effective conservative treatment.

Trismus

Mastication

10.1589/jpts.29.274

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Citations (4)

Alpha-decay-correlated mass measurement of 206,207Ra using an $α$-TOF detector equipped MRTOF-MS system

arXiv (Cornell University) (2021)

T. Niwase Masayoshi WADA P. Schury P. Brionnet S. D. Chen

The atomic masses of the isotopes $^{206,207}$Ra have been measured via decay-correlated mass spectroscopy using a multi-reflection time-of-flight mass spectrograph equipped with an $α$-TOF detector. The Ra isotopes were produced as fusion-evaporation products in the $^{51}$V+$^{159}$Tb reaction system and delivered by the gas-filled recoil ion separator GARIS-II at RIKEN. The $α$-TOF detector provides for high-accuracy mass measurements by correlating time-of-flight signals with subsequent $α$-decay events. The masses of $^{206}$Ra and $^{207g,m}$Ra were directly measured using a multi-reflection time-of-flight mass spectrograph equipped with an $α$-TOF detector. A mass excess of ME = 3538(15) keV/c$^2$ and an excitation energy of E$_{\rm ex}$ = 552(42) keV were determined. The $α$-decay branching ratio of $^{207m}$Ra, b$α$ = 0.26(20), was directly determined from decay-correlated time-of-flight signals, and the reduced alpha width of $^{207m}$Ra was calculated to be $δ^2$ = 50+62-41 keV from the branching ratio. The spin-parity of $^{207m}$Ra was confirmed to be $J^π$ = 13/2$^-$ from decay correlated mass measurement results.

10.48550/arxiv.2108.06245

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Bolometric direct dark matter search at the University of Tokyo

Nuclear Physics B - Proceedings Supplements (1996)

M. Minowa Yutaka Ito W. Ootani Keiji Nishigaki Yasuhiro Kishimoto

Dilution refrigerator

Instrumentation

10.1016/s0920-5632(96)00522-1

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Citations (1)

The World's First Test Facility That Enables the Experimental Visualization of Cavitation on a Rotating Inducer in Both Cryogenic and Ordinary Fluids

Journal of Fluids Engineering (2021)

Yutaka Ito

Abstract It is well known that cavitation breakdown, which is a phenomenon in which the pump head suddenly drops with a decrease in the inlet cavitation number, occurs in turbopumps. Especially in cryogenic pumps, cavitation breakdown occurs at a lower inlet cavitation number than that of ordinary fluids such as water. This phenomenon is referred to as a thermodynamic effect, as Stepanoff reported. The thermodynamic properties of the working fluid affect the sizes of the cavitation elements, which affect cavitation breakdown; therefore, experimental flow visualization is an effective approach to realize a more efficient and more reliable cryogenic pump. In 2010, the author and colleagues developed the world's first test facility to enable the visualization of cavitation on a rotating inducer in both cryogenic and ordinary fluids. At that time, only two reports on the flow visualization of a rotating cryogenic impeller had been published: one on flow visualization in liquid hydrogen by NASA in 1967 and the other on flow visualization in liquid nitrogen by the Japan Aerospace Exploration Agency (JAXA) in 2010. The present facility employs a triple-thread helical inducer with a diameter of 65.3 mm and a rotation rate of up to 8000 rpm, with both liquid nitrogen and water available as working fluids. Unsteady visualization experiments for cavitation on an inducer in liquid nitrogen and water have revealed the characteristics of tip vortex cavitation, backflow vortex cavitation, and cavitation element size based on comparisons between cryogenic fluids that exhibit a stronger thermodynamic effect and ordinary fluids such as water.

Backflow

Liquid nitrogen

10.1115/1.4051849

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Citations (15)