Yoko SAKAKIBARA
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View article: Asbestos in organochlorine insecticide powder sprinkled between pages of antiquarian books in a library in Japan
Asbestos in organochlorine insecticide powder sprinkled between pages of antiquarian books in a library in Japan Open
Librarians at a university had planned to check the collection prior to the library renovations that began in 2015. They had previous knowledge of the presence of a light greyish-white powder with an unpleasant odour (hereinafter referred …
View article: Study on Sound Radiated from Jet Issuing from Circular Convergent Nozzle
Study on Sound Radiated from Jet Issuing from Circular Convergent Nozzle Open
View article: Oscillation mode of pressure on inner wall of cylinder on which underexpanded jet impinges
Oscillation mode of pressure on inner wall of cylinder on which underexpanded jet impinges Open
View article: On sound radiated from radially spread underexpanded free jet
On sound radiated from radially spread underexpanded free jet Open
View article: A study on Sound radiated from underexpanded radial jet impinging on inner wall of cylinder
A study on Sound radiated from underexpanded radial jet impinging on inner wall of cylinder Open
View article: Measurement of Shear Stress Acting on Flat Plate Using Oil Film Interferometry
Measurement of Shear Stress Acting on Flat Plate Using Oil Film Interferometry Open
Measurements of frictional resistance play an important role in engineering practice. There are several types of air resistance acting on an aircraft, for example. One of them, frictional resistance, accounts for half of the air resistance…
View article: Behavior of Vortices Moving in the Vicinity of Supersonic Jet
Behavior of Vortices Moving in the Vicinity of Supersonic Jet Open
An underexpanded jet is one of supersonic jets. The jet becomes underexpanded when the pressure ratio exceeds the critical value across the convergent nozzle discharging it. The jet is not uniform because of the presence of the expansion w…
View article: A study on underexpanded radial jet impinging on inner wall of cylinder
A study on underexpanded radial jet impinging on inner wall of cylinder Open
A jet radially spreading like a disc from a small gap between two circular tubes placed face to face with each other was experimentally analysed in this study. The jet is underexpanded and impinges on a cylindrical inner wall concentric wi…
View article: 5. Service Robots for a Railway Station in JR East
5. Service Robots for a Railway Station in JR East Open
View article: Relation between Sound Radiated from Underexpanded Impinging Jet and Disturbance Convection Velocity
Relation between Sound Radiated from Underexpanded Impinging Jet and Disturbance Convection Velocity Open
An underexpanded jet perpendicularly impinging on a flat plate was experimentally studied in this study. The flow field radiates noise including screech, and its frequency and sound pressure are varied against the nozzle pressure ratio and…
View article: Five-year Survey of Personal Computer Work by the Staff of a Teacher Training University and Affiliated Schools
Five-year Survey of Personal Computer Work by the Staff of a Teacher Training University and Affiliated Schools Open
Objective: Occupational research relevant to visual display terminal (VDT) work is expanding on a global scale. To date, examination of possible occupational health-related issues has been insufficient. Methods: We conducted a longitudinal…
View article: A study on formation process of plate shock in underexpanded impinging jet
A study on formation process of plate shock in underexpanded impinging jet Open
This study focuses on the formation process of plate shock in an underexpanded jet impinging on a flat plate. The jet discharged from a convergent nozzle is underexpanded when the pressure ratio across the nozzle exceeds the critical value…
View article: Structure and Screech Tone of Radially Underexpanded Jet Emitted by Facing Cylinders
Structure and Screech Tone of Radially Underexpanded Jet Emitted by Facing Cylinders Open
An underexpanded jet has typical shock-cell structure and strongly oscillates, its behavior being known to cause many industrial problems. An underexpanded jet radially issues from intake and exhaust valves of an internal combustion engine…
View article: Characteristics of sound waves emitted from underexpanded jet impinging on flat plate
Characteristics of sound waves emitted from underexpanded jet impinging on flat plate Open
An underexpanded jet is often used as an assist gas to eliminate molten material during laser processing and as a cooling jet of glass tempering process. When the jet impinges on a flat plate to be processed, a plate shock wave is generate…
View article: Relationship Between Shock Wave and Oscillation Phenomena of Supersonic Jet Impinging on Flat Plate
Relationship Between Shock Wave and Oscillation Phenomena of Supersonic Jet Impinging on Flat Plate Open
An underexpanded jet impinging on a flat plate is numerically studied in this study. The jet, which is exhausted from a circular nozzle with the nozzle pressure ratio higher than the critical pressure ratio, becomes underexpanded and impin…
View article: A Study on Structure of Radial Jet in Underexpanded State
A Study on Structure of Radial Jet in Underexpanded State Open
This paper focuses on structure of an underexpanded jet spreading radially. The underexpanded radial jet can be seen in various industrial fields, such as intake process of an internal combustion engine, flow rate control by a pressure con…
View article: A Numerical Study on Jet Structure and Noise Emission of Underexpanded Radial Jet
A Numerical Study on Jet Structure and Noise Emission of Underexpanded Radial Jet Open
In this study, an underexpanded radial jet issuing from a small gap between two circular tubes facing each other is investigated numerically. Radial jet is formed, for example, downstream of high-pressure valves in piping system and of pop…
View article: A Study on Broad Band Noise Emitted from Underexpanded Radial Jet
A Study on Broad Band Noise Emitted from Underexpanded Radial Jet Open
This study focuses on a noise emitted from a radial underexpanded jet. The underexpanded jet is well known as one of supersonic jets and it is formed when the pressure ratio across a convergent nozzle is more than the critical value. The u…
View article: Acoustic analysis of flow field of supersonic jet
Acoustic analysis of flow field of supersonic jet Open
An underexpanded jet is one of supersonic jets. The jet becomes underexpanded when the pressure ratio exceeds the critical value across the convergent nozzle discharging it. The jet is not uniform because of the presence of the expansion w…
View article: Noise emission and structure of underexpanded radial jet and rectangular jet
Noise emission and structure of underexpanded radial jet and rectangular jet Open
An underexpanded radial jet is generated downstream of intake and exhaust valves of an internal combustion engine, a pressure control valve and so on. In addition, when a supersonic jet issuing from a circular nozzle impinges on a flat pla…
View article: Numerical Study on Supersonic Impinging Jet Issuing from Laval Nozzle
Numerical Study on Supersonic Impinging Jet Issuing from Laval Nozzle Open
The objective of this study is to investigate the decreasing ambient pressure at nozzle exit. If there is a sudden expansion section in supersonic ow at the Laval nozzle exit, phenomenon of decreasing pressure will occur at the downstream.…
View article: A Study on Screech Phenomena of Radial Underexpanded Jet
A Study on Screech Phenomena of Radial Underexpanded Jet Open
Supersonic impinging jet on at flat plate is commonly used as a simple model of flow field of industrial applications of high speed jet such as an assist gas for laser cutting, a cooling jet in glass tempering process and so on. In case of…
View article: The association among ferruginous body, uncoated fibers, asbestos and non-asbestos fibers in lung tissue in terms of length
The association among ferruginous body, uncoated fibers, asbestos and non-asbestos fibers in lung tissue in terms of length Open
To demonstrate the correlations between the concentrations of ferruginous body as well as uncoated fiber both of which can be observed with phase-contrast microscope and the concentration of various inorganic fibers including asbestos whic…
View article: Numerical Study on Supersonic Immpinging Jet Issuing from Laval Nozzle
Numerical Study on Supersonic Immpinging Jet Issuing from Laval Nozzle Open
Laval nozzle is commonly used in the cold spray processing, which is a material deposition process using supersonic gas flow. Small powder particles of material are injected into the gas flow and accelerated to velocities enough to form fi…