In-Process Measurement of Surface Roughness in Turning by Laser Beams

1981 ◽  
Vol 103 (2) ◽  
pp. 203-209 ◽  
Author(s):  
M. Shiraishi
Keyword(s):  
Surface Roughness ◽  
Optical Method ◽  
Experimental Results ◽  
Laser Beams ◽  
New Technique ◽  
Process Measurement ◽  
Feed Direction ◽  
A New Technique

A new technique for in-process measurement of surface roughness is introduced which employs an optical method by using double laser beams. This makes it possible to detect the surface roughness not only along the circumferential path but also along the feed direction even during machining. The experimental results show that the presence of chipping and chattering can be detected sensitively along both measurements directions and the maximum roughness value is always obtainable from the reading along the feed direction.

A Technique for the Laboratory Determination of Recirculation in Single Needle Dialysis

1993 ◽  
Vol 16 (2) ◽  
pp. 63-70 ◽  
Author(s):  
N.A. Hoenich ◽  
P.T. Smirthwaite ◽  
C. Woffindin ◽  
P. Lancaster ◽  
T.H. Frost ◽  
...  
Keyword(s):  
Experimental Data ◽  
Flow Rate ◽  
Experimental Results ◽  
New Technique ◽  
Treatment Efficiency ◽  
Single Lumen ◽  
Theoretical Predictions ◽  
Lumen Catheter ◽  
A New Technique

Recirculation is an important factor in single needle dialysis and, if high, can compromise treatment efficiency. To provide information regarding recirculation characteristics of access devices used in single needle dialysis, we have developed a new technique to characterise recirculation and have used this to measure the recirculation of a Terumo 15G fistula needle and a VasCath SC2300 single lumen catheter. The experimentally obtained results agreed well with those established clinically (8.5 ± 2.4% and 18.4 ± 3.4%). The experimental results have also demonstrated a dependence on access type, pump speeds and fistula flow rate. A comparison of experimental data with theoretical predictions showed that the latter exceeded those measured with the largest contribution being due to the experimental fistula.

scholarly journals X-Ray Reflectivity Measurements of Surface Roughness Using Energy Dispersive Detection

1990 ◽  
Vol 208 ◽  
Author(s):  
E. Chason ◽  
D. T. Warwick
Keyword(s):  
Surface Roughness ◽  
Excellent Agreement ◽  
Ion Bombardment ◽  
Energy Dispersive ◽  
New Technique ◽  
Scattering Angle ◽  
X Ray ◽  
Growth Chambers ◽  
A New Technique ◽  
Better Than

ABSTRACTWe describe a new technique for measuring X-ray reflectivity using energy dispersive X-ray detection. The benefits of this method are the use of a fixed scattering angle and parallel detection of all energies simultaneously. These advantages make the technique more compatible with growth chambers and useable with laboratory X-ray sources. We find excellent agreement between the calculated Fresnel reflectivity and the reflectivity obtained from a smooth Ge (001) surface. Reflectivities obtained during 500 eV Xe ion bombardment of Ge surfaces demonstrate the sensitivity of the technique to be better than 1 Å.

A New Tightening Technique for Threaded Fasteners

1994 ◽  
Vol 116 (2) ◽  
pp. 64-69 ◽  
Author(s):  
M. Hagiwara ◽  
N. Ohashi
Keyword(s):  
Rotation Angle ◽  
High Accuracy ◽  
Experimental Results ◽  
New Technique ◽  
Relative Rotation ◽  
Threaded Fasteners ◽  
Accuracy And Precision ◽  
Different Types ◽  
A New Technique

A new technique for tightening threaded fasteners was proposed aiming to assure the quality and the reliability in the tightening operations. The technique is based on the torque difference and the relative rotation angle in tightening and loosening process, and no preliminary experiment is required. Repeated tightening (and loosening) experiments were performed for different types of lubricant to verify the applicability of this technique. Experimental results show that the preload provided to the joint can be estimated with high accuracy and precision by this technique, and the possibility to boost the reliability of tightening control is confirmed.

Performance Upgrade of Pantograph Using Variable Stiffness Device

2010 ◽  
Author(s):  
Yoshitaka Yamashita ◽  
Mitsuru Ikeda
Keyword(s):  
Numerical Simulation ◽  
Dynamic Characteristics ◽  
Variable Stiffness ◽  
Experimental Results ◽  
New Technique ◽  
Current Collection ◽  
Simulation Results ◽  
Basic Characteristics ◽  
A New Technique

This paper proposes a new technique to improve the current collection performance of pantographs. For this purpose, the pan springs, which are usually coil springs, are replaced with variable stiffness devices. The device described in this paper is comprised of two air springs facing each other. This paper firstly outlines the method for the improvement for current collection performance and exhibits some numerical simulation results, which supports the efficacy of the method. It then presents the prototype of the variable stiffness device and shows its basic characteristics. Finally, it shows the experimental results of the dynamic characteristics control of a pantograph using the variable stiffness devices.

scholarly journals The mortality of the haemolytic Streptococcus on the skin and on other surfaces

1938 ◽  
Vol 38 (5) ◽  
pp. 575-586 ◽  
Author(s):  
J. M. L. Burtenshaw
Keyword(s):  
Experimental Work ◽  
Experimental Results ◽  
New Technique ◽  
Haemolytic Streptococcus ◽  
School Of Medicine ◽  
National School ◽  
Technical Assistant ◽  
A New Technique

1. A new technique is described for recovering applied organisms from the skin and other surfaces.2. Experiments are analysed, in which staphylococci and streptococci are recovered by this technique from various areas of the skin and from glass and rubber.3. It is concluded that the surfaces examined can be arranged in a definite order of decreasing disinfectant power.4. The peculiar disinfectant power of rubber is considered.5. The deterioration in surface viability of streptococci still surviving in saline suspension is described.6. The experimental results are discussed in the light of previous investigations.My grateful thanks are due to Professor J. B. Duguid, Department of Pathology and Bacteriology, Welsh National School of Medicine, Cardiff, for his patient counsel and criticism, and to Mr J. P. Napper, Technical Assistant for his skill in making apparatus and his help in the experimental work.

scholarly journals Ultrasound Modulation of Diffusive Optical Waves for Medical Imaging

2000 ◽  
Author(s):  
Daniel J. Townsend ◽  
Jonathan J. Stott ◽  
Ronald A. Roy ◽  
Charles A. DiMarzio
Keyword(s):  
Medical Imaging ◽  
Focused Ultrasound ◽  
Optical Tomography ◽  
The Body ◽  
Experimental Results ◽  
New Technique ◽  
Physical Limitation ◽  
Tissue Phantoms ◽  
Ultrasound Modulation ◽  
A New Technique

Abstract Diffusive optical tomography [DOT] is a technique for imaging within the body. While DOT provides excellent results under good conditions, there are many situations (due to anatomy or other physical limitation) in which it suffers from a “limited view” problem. In this paper we discuss our work on a new technique for combining DOT with focused ultrasound to generate virtual sources of illumination. These virtual sources help overcome the limited view problem. We present our experimental results using laboratory tissue phantoms.

Anticipating π-Bond Dispositions in Cyclic, Even, Classical Hydrocarbons

2011 ◽  
Vol 64 (3) ◽  
pp. 324 ◽  
Author(s):  
Richard F. Langler
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Experimental Results ◽  
New Technique ◽  
Structural Isomers ◽  
Functional Theory ◽  
Singlet States ◽  
Hückel Theory ◽  
A New Technique

A new technique, which employs π-bond placement coefficients, is presented. That technique, in conjunction with a few parameters that are readily available from traditional Hückel theory, permits one to systematically anticipate π-bond placements for optimized lowest-lying singlet states. One may then foresee the relative magnitudes of calculated ΔHf values for selected sets of structural isomers. Structural predictions are compared with parameterization method 3 (PM3) calculations, density functional theory calculations and experimental results. Reasonable expectations for the most stable structure narrow the choice of molecules that may then be scrutinized by more exact computations or by experiment.

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