Edge Of Frame Research Articles

Electron-beam-induced discharge phenomena of teflon films for space use

We investigated the discharge phenomena of Teflon FEP (fluorinated ethylene propylene) films used as thermal control material of spacecraft by electron-beam irradiation simulating hot plasma in space. FEP films of two thicknesses, 25 and 127 μm, were tested. The results obtained were as follows. (1) In 127-μm-thick FEP film, a surface discharge triggered by high electric field at the triple junction of the edge of the metal frame occurred. (2) In 25-μm-thick FEP film, punchthrough discharge accompanied by surface flashover occurred. (3) Discharge frequency increased as nearly the 1/2 power of the electron-beam current density under constant irradiation energy. On the other hand, it increased linearly with the irradiation energy under constant beam current density, but with sufficient threshold electron energy to cause discharge. These results were explained by comparison between the surface electric field and the bulk electric field in FEP film obtained analytically by using a two-dimensional charging model. © 1999 Scripta Technica, Electr Eng Jpn, 129(1): 10–19, 1999

Computational simulation of flows in an entire centrifugal heart pump.

A prototype computational code to numerically simulate the blood flows in an entire centrifugal heart pump has been developed. The unsteady incompressible Navier-Stokes equations are solved on a parallel computer, the Cray T3E. By domain decomposition, the whole flow space is decomposed to a number of subdomains for each of which a structured algebraic grid is assigned. The grids for the inlet eye and blade regions are on the rotating frame while grids for other regions are on the nonrotating frame, and the edge of the rotating grids slides over the edge of the nonrotating frame, and the edge of the rotating grids slides over the edge of the nonrotating grids. The code is able to simulate the flows in the rotor, volute, and diffuser as well as to find pump performance indicators. The present paper presents an overview of the code and describes a study on the effect of volute width.

8.3: Aperture‐Grille Vibration Suppression in Diamondtron CRT

AbstractThe Aperture Grille AG of a Diamondtron CRT is fixed on an AG frame with some tension in a specific direction and supported on a panel by four springs welded to the edge of the AG frame. When the panel vibrates, the vibration is transmitted to the AG frame and the AG. This causes a disturbance in the image on the panel. It is therefore necessary to restrain AG vibration in order to make the CRT high‐resolution. This paper describes the vibration measurement system developed to analyze the vibration of the AG and its frame, the vibration model based on experimental results, and the method utilized to restrain the AG vibration.

Large‐area, high‐resolution image analysis of composite materials

An image analysis system based on a small network of parallel processors hosted within a PC has been developed to measure the orientations of glass and carbon fibres in a polymer matrix from a polished section using optical microscopy. A computer‐controlled XY translation stage is used to scan a large sample area (mm × mm), at a high magnification to minimize measurement errors. The distance that the stage moves between adjacent image frames is accurately measured allowing partial images at the edges of image frames to be reconstructed and so produce a continuous area. By removing a small amount of material from the sample by polishing and rescanning the same sample area, data from a number of serial sections can be obtained. Pattern matching is then used to correlate the fibre images from each section, allowing full three‐dimensional orientation data to be extracted, overcoming the limitations of measurements from a single, two‐dimensional section plane.

A Painting Procedure Based on the Use of Superimposed Reversed Transparent Photographic Images and an Implication of the Procedure

two reasons for making the film. First, I wished to make a summarizing record of my work, which I thought would stimulate me to start afresh. Second, I intended that the film itself would be an artwork. After the film was made, I employed two identical copies of it to make a new film by superimposing the two copies face to face, so that the right edge of one frame of one copy coincided with the left edge of the identical frame in the other copy. In effect, pairs of reversed images were superimposed and the resulting images were recorded on the final film, frame by frame. Figure 1 shows an example of an image on one frame recorded on the film.

MODIFICATION OF THE ESMARCH CHLOROFORM INHALER.

This modification of Esmarch's inhaler possesses the following advantages: A simple, firm and rapid method of fastening gauze or other material to the Esmarch frame by fitting the ring inside of the frame instead of on the outside, as in the old model. The ring and frame are so fastened together that one can not be lost from the other, nor can they in any manner be put together wrong. The patient is not annoyed by the rough edge of the gauze or metallic frame, and yet it will fit closer to the face, thereby requiring less of the anesthetic. Should the gauze become soiled with vomit or sputa during anesthesia it can be almost instantly replaced with new.