The Determination of Flash Temperature in Intermittent Magnetic Head/Disk Contacts Using Magnetoresistive Heads: Part II—Experimental Investigation

1993 ◽  
Vol 115 (1) ◽  
pp. 179-184 ◽  
Author(s):  
Yufeng Li ◽  
Aric R. Kumaran
Keyword(s):  
Experimental Investigation ◽  
Temperature Sensitivity ◽  
Radial Direction ◽  
Flash Temperature ◽  
Magnetic Head ◽  
Magnetoresistive Sensor ◽  
Magnetoresistive Heads ◽  
Transient Contact ◽  
Spinning Speed

The flash temperature during intermittent head/disk contacts was measured using specially fabricated magnetoresistive heads. Microasperities were intentionally created on disk substrates, and ZrO2 was sputtered on disc surfaces as overcoat. It was found that with a disk spinning speed of 20 m/s, flash temperature could reach 50 to 100°C for transient contact (head was moving in disk radial direction), but less than 40°C for dwell on track contact (head was stationary). The contact times were in the range from submicroseconds to several microseconds, contact widths on the order of several micrometers, and temperature sensitivity coefficients in the range from 0.15 to 0.7 for a 2.5–μ high magnetoresistive sensor.

The Determination of Flash Temperature in Intermittent Magnetic Head/Disk Contacts Using Magnetoresistive Heads: Part I—Model and Laser Simulation

1993 ◽  
Vol 115 (1) ◽  
pp. 170-178 ◽  
Author(s):  
Yufeng Li ◽  
Aric R. Kumaran
Keyword(s):  
Theoretical Model ◽  
Temperature Response ◽  
Sensitivity Coefficient ◽  
Flash Temperature ◽  
Magnetic Head ◽  
Response Characteristics ◽  
Power Intensity ◽  
Magnetoresistive Sensor ◽  
Laser Simulation ◽  
Magnetoresistive Heads

The feasibility of using a magnetoresistive magnetic head to determine the flash temperature of intermittent magnetic head/disk contacts is investigated. A finite difference model is developed to study the effects of the magnetoresistive sensor height, the contact power intensity and the contact duration on the temperature response characteristics of the magnetoresistive sensor. A pulsed neody-minum:yttrium-aluminum-garnet laser is used as the heat source to simulate the contact and verify the model. The simulation results agree well with the theoretical model. Based on the theoretical model and laser simulation, a temperature sensitivity coefficient ζ is proposed to determine the surface temperature rise.

Experimental Investigation on the Quasi-Ballistic Transport: Part I—Determination of a New Backscattering Coefficient Extraction Methodology

2009 ◽  
Vol 56 (3) ◽  
pp. 408-419 ◽  
Author(s):  
Vincent Barral ◽  
Thierry Poiroux ◽  
JÉrÔme Saint-Martin ◽  
Daniela Munteanu ◽  
Jean-Luc Autran ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Ballistic Transport ◽  
Backscattering Coefficient ◽  
Transport Part

Experimental Investigation of Microcutting Mechanisms in Marble Grinding

2009 ◽  
Vol 131 (6) ◽  
Author(s):  
LJ. Tanovic ◽  
P. Bojanic ◽  
R. Puzovic ◽  
S. Klimenko
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Cutting Force ◽  
Surface Finish ◽  
Normal Component ◽  
Natural Material ◽  
Grinding Process ◽  
Force Component ◽  
Diamond Grain

This paper offers an experimental study of the microcutting mechanisms in marble grinding to aid the optimization of the marble grinding process. The necessity for investigating these mechanisms is dictated by the increased use of marble in many applications and the fact that grinding and polishing processes are the dominant technologies used to meet surface finish requirements in this natural material. The experiments are aimed at the determination of the normal component of the cutting force and of the grain traces in microcutting with a single diamond grain. The investigations carried out make provisions for establishing critical grain penetration and cutting depths and allow the prediction of the normal cutting force component as a function of grain penetration speed and depth.

Shrinkage of Fine-Grained Composites Based on Alkali-Activated Slag

2018 ◽  
Vol 761 ◽  
pp. 7-10 ◽  
Author(s):  
Barbara Kucharczyková ◽  
Vlastimil Bílek Jr. ◽  
Dalibor Kocáb ◽  
Ondřej Karel
Keyword(s):  
Experimental Investigation ◽  
Experimental Determination ◽  
Alkali Activated Slag ◽  
Fine Grained ◽  
Shrinkage Reducing Admixture ◽  
Activated Slag ◽  
Alkali Activated

The paper deals with the experimental determination of shrinkage development of the composites based on the alkali-activated slag (AAS). The main aim of the experimental investigation was to verify the effect of the addition of shrinkage-reducing admixture (SRA) on the overall process of shrinkage properties during AAS composites ageing.

scholarly journals Determination of Cure Shrinkage in Sl Layer Built Plates using Lamination Theory

2001 ◽  
Vol 10 (1) ◽  
pp. 096369350101000 ◽  
Author(s):  
A. Aggelopoulos ◽  
D. Karalekas
Keyword(s):  
Experimental Investigation ◽  
Solidification Process ◽  
Shrinkage Strain ◽  
Uv Exposure ◽  
Chemical Shrinkage ◽  
Resin Layer ◽  
Lamination Theory ◽  
Cure Shrinkage

This paper reports on a combined analytical and experimental investigation undertaken for the determination of polymerisation shrinkage strains resulted in photopolymer resin plates during the laser solidification process. A resin layer is laser cured on an identical layer of the same material that already has been cured and post cured under ultraviolet (UV) exposure. The assembled laminate is then UV cured, and the resulting warpage is recorded by means of the shadow moirtι method. The resulting warpage, consisting of elliptical equal deflection contours, is related to the polymerisation effective chemical shrinkage strain using the elastic lamination theory.

Momentum Exchanges and Energy Transfers in Cross Flow Fans

1987 ◽  
Author(s):  
Joseph Mazur ◽  
Trilochan Singh
Keyword(s):  
Experimental Investigation ◽  
Flow Field ◽  
Cross Flow ◽  
Operating Conditions ◽  
Energy Transfers ◽  
Cross Flow Fan

An experimental investigation of the flow in a cross flow fan at three operating conditions is reported. Velocity and pressure maps for the flow field are presented along with a determination of the momentum exchanges and energy transfers between the blading and the flow field regions.

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