An improved semi-empirical procedure for Compton scattering technique applied to measure pipeline thickness

2021 ◽  
Author(s):  
Vo Hoang Nguyen ◽  
Nguyen Huu Bao ◽  
Huynh Dinh Chuong ◽  
Nguyen Duy Thong ◽  
Tran Thien Thanh ◽  
...  
Keyword(s):  
Compton Scattering ◽  
Empirical Procedure ◽  
Scattering Technique ◽  
Semi Empirical

Measurement of Mass Attenuation Coefficients of Blue Sapphire at Different Photon Energy by Compton Scattering Technique

2011 ◽  
Vol 103 ◽  
pp. 71-75 ◽  
Author(s):  
Jakrapong Kaewkhao ◽  
P. Lofimkitjaroenporn ◽  
S. Tuscharoen ◽  
T. Kittiauchawal ◽  
W. Chewpraditkul ◽  
...  
Keyword(s):  
Compton Scattering ◽  
Attenuation Coefficient ◽  
Gamma Rays ◽  
Mass Attenuation Coefficient ◽  
Attenuation Coefficients ◽  
Scattering Technique ◽  
Mass Attenuation Coefficients ◽  
Experimental Values ◽  
Good Agreement ◽  
Mass Attenuation

The mass attenuation coefficients of blue sapphire were measured at the different energy of γ-rays using the Compton scattering technique. There are in good agreement of scattered gamma rays energies between theoretical value and experimental value, reflecting the validation of Compton scattering system setup. The results show that, the experimental values of mass attenuation coefficient are in good agreement with the theoretical values. The mass attenuation coefficients increase with the decrease in gamma rays energies. This may be attributed to the higher photon interaction probability of blue sapphire at lower energy. This result is a first report of mass attenuation coefficient of blue sapphire at different gamma rays energies.

Étude théorique des réactions d'abstraction d'hydrogène , avec R, X≡H, CH3, NH2,OH et F

1985 ◽  
Vol 63 (7) ◽  
pp. 1447-1456 ◽  
Author(s):  
Georges Leroy ◽  
Michel Sana ◽  
Anne Tinant
Keyword(s):  
Transition State ◽  
Rate Constants ◽  
Transition State Theory ◽  
Hydrogen Abstraction ◽  
State Theory ◽  
Arrhenius Behavior ◽  
Activation Barriers ◽  
Empirical Procedure ◽  
Semi Empirical ◽  
Theory And Experiment

Hydrogen abstraction reactions [Formula: see text] with R, X≡H, CH3, NH2,OH, and F have been studied at the abinitio 6-31G – UHF level. However, energetic properties were computed at the CI level. Rate constants and Arrhenius parameters have been obtained using the transition state theory formalism with Eckart's tunneling correction. The discrepancy between theoretical and experimental results led us to elaborate a semi-empirical procedure to calculate activation barriers, in which the bonds R—H and X—H are represented by Morse curves. Thus, the agreement between theory and experiment is much better. Moreover, the results obtained by this procedure demonstrate the non-Arrhenius behavior of all the reactions under consideration and allow us to rationalize a large number of experimental facts.

scholarly journals Validation of a Semi-Empirical Procedure for Estimating Steady-State, Groundwater Inflows in Shallow Rock Tunnels Through Case Study Analyses

2021 ◽  
Author(s):  
Mark J. Vanarelli
Keyword(s):  
Steady State ◽  
Case Studies ◽  
Test Data ◽  
Groundwater Inflow ◽  
Empirical Procedure ◽  
Pressure Test ◽  
Under Construction ◽  
Rock Tunnels ◽  
Semi Empirical

Abstract The construction of underground excavations and tunnels can only be done safely and economically when the subsurface conditions are adequately understood. Excessive groundwater inflows into rock tunnels under construction can injury personnel and terminate the construction of the tunnel project. Therefore, it is important to accurately estimate groundwater inflows into rock tunnels. A semi-empirical procedure/method for estimating steady-state, groundwater inflows in shallow rock tunnels is presented and discussed in this paper. In addition, this paper presents two case study analyses which include the Elizabethtown tunnel in New Jersey and the Toledo tunnel in Ohio. Packer test (i.e., pressure test) data was analyzed for both case studies utilizing this semi-empirical procedure. This paper reviews the theory behind the procedure, summarizes validates the procedure through case study analyses. It also describes previous proposed modifications and clarifies the need for any such modifications. In general, good groundwater inflow estimates were derived for shallow rock tunnels utilizing this semi-empirical procedure/method.

scholarly journals Electronic Structure of Copper Antimony Using Compton Scattering Technique

2016 ◽  
Vol 13 (1) ◽  
pp. 167-173
Author(s):  
Sameen Mohammed ◽  
◽  
Mohamad Ahmed ◽  
Abdulhadi Ghaleb ◽  
◽  
...  
Keyword(s):  
Electronic Structure ◽  
Compton Scattering ◽  
Scattering Technique

Electronic Structure of Gadolinium and Dysprosium Using Compton Scattering Technique

2006 ◽  
Vol 61 (5-6) ◽  
pp. 299-305
Author(s):  
Shabha Khera ◽  
Narayan Lal Heda ◽  
Sonal Mathur ◽  
Babu Lal Ahuja
Keyword(s):  
Electronic Structure ◽  
Compton Scattering ◽  
Gamma Rays ◽  
Free Electron ◽  
Cohesive Energy ◽  
Electron Model ◽  
Free Electron Model ◽  
Scattering Technique ◽  
Derivatives Of

In this paper we present the first ever measured Compton profiles of polycrystalline gadolinium and dysprosium using 661.65 keV gamma-rays. The Compton data are compared with renormalized-freeatom (RFA) and free-electron model profiles. In both cases the RFA model (with e− - e− correlation) gives a better agreement with the experiment. The hybridization effects of s-, p-, d-, and f-electrons are discussed, using the first derivatives of the Compton profiles. We also report the cohesive energy of both samples, computed from the RFA calculations. - PACS numbers: 13.60.F, 71.15.Nc, 78.70. -g, 78.70.Ck

Electronic structure of CdMoO4 using Compton scattering technique

2014 ◽  
Author(s):  
Khushboo Sharma ◽  
Jagrati Sahariya ◽  
B. L. Ahuja
Keyword(s):  
Electronic Structure ◽  
Compton Scattering ◽  
Scattering Technique

scholarly journals Dynamics of chemical reactions of astrophysical interest

1997 ◽  
Vol 178 ◽  
pp. 271-280 ◽  
Author(s):  
M. Alagia ◽  
N. Balucani ◽  
L. Cartechini ◽  
P. Casavecchia ◽  
G.G. Volpi
Keyword(s):  
Potential Energy ◽  
Ab Initio ◽  
Chemical Reactions ◽  
Potential Energy Surfaces ◽  
Experimental Results ◽  
Empirical Potential ◽  
Beam Scattering ◽  
Scattering Technique ◽  
Energy Surfaces ◽  
Semi Empirical

The dynamics of the astrophysically relevant reactions OH + H2,OH+CO,N(2D)+C2H2 and O(1D)+H2 are studied using the crossed beam scattering technique. Comparisons of the experimental results with those of dynamics calculations on ab initio and semi-empirical potential energy surfaces are discussed.

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