Temperature decay of a laser-produced aluminum plasma

1970 ◽  
Vol 48 (12) ◽  
pp. 1421-1425 ◽  
Author(s):  
N. H. Burnett ◽  
P. R. Smy
Keyword(s):  
Laser Irradiation ◽  
Cross Section ◽  
Small Cross Section ◽  
Aluminum Target ◽  
Early Stages ◽  
Temperature Decay ◽  
Aluminum Plasma ◽  
Carbon Plasma ◽  
Good Agreement

The temperature of the plasma produced by Q-spoiled laser irradiation of an aluminum target has been measured by monitoring the emission and absorption through a small cross section of the plasma in the early stages of the flare decay. The temperature obtained in this manner is found to be much less than previous estimates based on the velocities of emitted ions, but is in good agreement with recent measurements on a carbon plasma.

Detonation Propagation at Bend Angles in Channels of Small Cross Section

2018 ◽  
Vol 54 (5) ◽  
pp. 624-628
Author(s):  
E. V. Khaldeev ◽  
A. V. Bessonova ◽  
D. A. Pronin ◽  
Yu. M. Sustaeva ◽  
O. V. Shevlyagin
Keyword(s):  
Cross Section ◽  
Small Cross Section ◽  
Detonation Propagation ◽  
Bend Angles

The continuous absorption of light in alkali-metal vapours

1953 ◽  
Vol 219 (1136) ◽  
pp. 89-101 ◽  
Keyword(s):  
Cross Section ◽  
Alkali Metals ◽  
Theoretical Calculations ◽  
Wave Length ◽  
Energy Difference ◽  
Continuous Absorption ◽  
Absorption Of Light ◽  
Sodium Vapour ◽  
Good Agreement ◽  
Dipole Length

The first section of this paper is an account of some experiments on the absorption of light in sodium vapour from the series limit at 2412 Å to about 1600 Å (an energy difference of 2·6 eV). The absorption cross-section at the limit is 11·6 ± 1·2 x 10 -20 cm 2 . The cross-section decreases giving a minimum of 1·3 ± 0·6 x 10 -20 cm 2 at 1900 Å and then increases to 1600 Å. A theoretical calculation by Seaton based on the dipole-length formula gives good agreement with the experiments at the series limit and also correctly predicts the wave-length for the minimum, but it predicts a significantly lower absorption at the minimum. The experiments described in the first section of the paper conclude a series on the absorption of light in the alkali metals. The second section consists of a general discussion of the results of these experiments and of their relation to theoretical calculations. There is good agreement between theory and experiment except in regard to the magnitude of the absorption at the minimum.

scholarly journals The Numerical Techniques for Thermal Distribution Analysis in Optical Waveguides

2008 ◽  
Vol 4 (2) ◽  
Author(s):  
Maslina Yaacob ◽  
Mohd Haniff Ibrahim ◽  
Norazan Mohd Kassim ◽  
Abu Bakar Mohammad
Keyword(s):  
Heat Transfer ◽  
Cross Section ◽  
Optical Waveguides ◽  
Distribution Analysis ◽  
Heat Transfer Mechanism ◽  
Numerical Techniques ◽  
Planar Optical Waveguide ◽  
Thermal Distribution ◽  
Single Heater ◽  
Good Agreement

In this paper, the analysis of thermal distribution in planar optical waveguide cross-section when a single heater electrode applied is presented. Starting from the heat equation, the thermal analysis has been done using two proposed numerical methods which are include finite difference method (FDM) and finite element method (FEM). By considering conduction as the only heat transfer mechanism, the obtained results from the mentioned methods are shown to have a good agreement.

scholarly journals Studies of Deuteron–Proton Collisions at 100 MeV

2021 ◽  
Vol 62 (4) ◽  
Author(s):  
I. Skwira-Chalot ◽  
N. Kalantar-Nayestanaki ◽  
St. Kistryn ◽  
A. Kozela ◽  
E. Stephan
Keyword(s):  
Cross Section ◽  
Effective Field Theory ◽  
Beam Energy ◽  
Effective Field ◽  
Breakup Reaction ◽  
Low Energy ◽  
Chiral Effective Field Theory ◽  
Proton Collisions ◽  
Realistic Potentials ◽  
Good Agreement

AbstractDifferential cross section for the $$^1H(d,pp)n$$ 1 H ( d , p p ) n reaction is sensitive to various dynamical ingredients and allows for thorough tests of theoretical potentials describing the interaction in the three nucleon systems. The analysis of the experimental data collected for the breakup reaction at the beam energy of 100 MeV has been performed and the first cross section results for selected configurations are presented in this paper. They are in good agreement with calculations based on the realistic potentials. Studies at this relatively low energy will also be important for examining awaited calculations within the Chiral Effective Field Theory.

Numerical and Experimental Evaluation of Turbulent Flow in Volute

2003 ◽  
Author(s):  
Akitomo Igarashi ◽  
Kazuyuki Toda ◽  
Makoto Yamamoto ◽  
Toshimichi Sakai
Keyword(s):  
Numerical Simulation ◽  
Cross Section ◽  
Three Dimensional ◽  
Experimental Result ◽  
Centrifugal Fan ◽  
Flow Conditions ◽  
Flow Angle ◽  
Fan Performance ◽  
Centrifugal Fans ◽  
Good Agreement

The performance of centrifugal fans is considerably influenced by the design of tongue at the re-circulation port. The flow in the volute of a centrifugal fan was studied both experimentally and numerically. In this experiment, flow angle, pressure and velocity profiles were measured at a large number of locations in the volute. The flow field in the volute passage was analyzed using Computational Fluid Dynamics. The flow was assumed to be three dimensional, turbulent and steady. The numerical simulation produced qualitatively good agreement with the experimental result. The results from experiment and numerical simulation indicated that the adoption of a re-circulating flow port improved fan performance for all flow conditions. In addition, the existence of strong secondary flow was apparent at the cross-section of the volute passage.

scholarly journals Radar Cross-Section Formulation of a Shell-Shaped Projectile Using Modified PO Analysis

2012 ◽  
Vol 2012 ◽  
pp. 1-9
Author(s):  
Mohammad Asif Zaman ◽  
Md. Abdul Matin
Keyword(s):  
Differential Geometry ◽  
Cross Section ◽  
Current Density ◽  
Surface Current ◽  
Radar Cross Section ◽  
Analysis Procedure ◽  
Physical Optics ◽  
Surface Current Density ◽  
Filtering Method ◽  
Good Agreement

A physical optics based method is presented for calculation of monostatic Radar Cross-Section (RCS) of a shell-shaped projectile. The projectile is modeled using differential geometry. The paper presents a detailed analysis procedure for RCS formulation using physical optics (PO) method. The shortcomings of the PO method in predicting accurate surface current density near the shadow boundaries are highlighted. A Fourier transform-based filtering method is proposed to remove the discontinuities in the approximated surface current density. The modified current density is used to formulate the scattered field and RCS. Numerical results are presented comparing the proposed method with conventional PO method. The results are also compared with published results of similar objects and found to be in good agreement.

Provision of Long Item Materials

2013 ◽  
Vol 572 ◽  
pp. 257-260
Author(s):  
Markus Straub ◽  
Shu Jun Zhang ◽  
Carsten Manz ◽  
Kevin Hapeshi
Keyword(s):  
Case Studies ◽  
Cross Section ◽  
The Other ◽  
Small Cross Section ◽  
Plant Area

Purpose: This paper shows the effects of using Minomi on the provision of long items in the plant area. In details it will be evaluated if the Minomi principle is usable for the provision of long item material at the manufacturing area and what improvements can be achieved. Definitions of the term Minomi and the term long item: The term long item is used in the logistic sector for all materials that are longer than 2.5 meters, require individually packing and have a relatively small cross section [1,2]. The term Minomi has not been clearly defined. In practise, the term Minomi is often associated with a system that does not use boxes for the material provision [3]. Findings: Through the case studies, it has been found that additional advantages can be obtained by using Minomi for the provision of long items than the other existing methods.

Analysis of Uniform Deep Oval Reinforcing Rings

1964 ◽  
Vol 8 (02) ◽  
pp. 21-28 ◽  
Author(s):  
William P. Vafakos
Keyword(s):  
Hydrostatic Pressure ◽  
Cross Section ◽  
Composite Structure ◽  
Reference Line ◽  
Taylor Model ◽  
Test Results ◽  
Local Curvature ◽  
Oval Cross Section ◽  
Ring Shell ◽  
Good Agreement

Equations which are applicable to uniform deep oval rings in which the local curvature of an arbitrary reference line is prescribed are derived and simplified for application to oval ring-shell combinations. Theoretical estimates of the stresses and displacements are obtained for a typical reinforcing ring of a ring-stiffened oval cylinder recently tested under hydrostatic pressure by the David Taylor Model Basin. These results are obtained by appropriately approximating the oval cross section and by assuming that the composite structure responds as an oval ring. The theoretical flange stresses are shown to be in good agreement with available test results.

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