Final state effects in the neutron Compton scattering on hydrogen molecules—a new approach

2012 ◽  
Vol 694 ◽  
pp. 286-296 ◽  
Author(s):  
Erik B. Karlsson
Keyword(s):  
Compton Scattering ◽  
Final State ◽  
New Approach ◽  
Hydrogen Molecules

scholarly journals Compton scattering tomography for agricultural measurements

2006 ◽  
Vol 26 (1) ◽  
pp. 151-160 ◽  
Author(s):  
Paulo E. Cruvinel ◽  
Fatai A. Balogun
Keyword(s):  
Compton Scattering ◽  
Linear Correlation ◽  
Imaging Technique ◽  
Reconstruction Algorithm ◽  
Transmission Tomography ◽  
Electronic Density ◽  
New Approach ◽  
Quantitative Results ◽  
Water Contents ◽  
Better Than

This paper presents a new approach in tomographic instrumentation for agriculture based on Compton scattering, which allows for the simultaneous measurements of density and moisture of soil samples. Compton tomography is a technique that can be used to obtain a spatial map of electronic density of samples. Quantitative results can be obtained by using a reconstruction algorithm that takes into account the absorption of incident and scattered radiation. Results show a coefficient of linear correlation better than 0.81, when comparison is made between soil density measurements based on this method and direct transmission tomography. For soil water contents, a coefficient of linear correlation better than 0.79 was found when compared with measurements obtained by time domain reflectrometry (TDR). In addition, a set of Compton scatter images are presented to illustrate the efficacy of this imaging technique, which makes possible improved spatial variability analysis of pre-established planes.

scholarly journals Final-state interaction in Compton scattering from electron liquids

2000 ◽  
Vol 62 (12) ◽  
pp. R7687-R7690 ◽  
Author(s):  
C. Sternemann ◽  
K. Hämäläinen ◽  
A. Kaprolat ◽  
A. Soininen ◽  
G. Döring ◽  
...  
Keyword(s):  
Compton Scattering ◽  
Final State Interaction ◽  
State Interaction ◽  
Final State ◽  
Electron Liquids

Final-state electron-electron interaction in Compton scattering

2001 ◽  
Vol 64 (12) ◽  
Author(s):  
J. A. Soininen ◽  
K. Hämäläinen ◽  
S. Manninen
Keyword(s):  
Compton Scattering ◽  
Electron Interaction ◽  
Final State ◽  
State Electron

Subsystem measurement in unitary quantum measurement theory with redundant entanglement

2014 ◽  
Vol 12 (05) ◽  
pp. 1450032 ◽  
Author(s):  
Fedor Herbut
Keyword(s):  
Quantum Measurement ◽  
Measurement Theory ◽  
Quantum Measurement Theory ◽  
Final State ◽  
Unitary Evolution ◽  
New Approach ◽  
Change Of State ◽  
Complete Measurement ◽  
Distant Measurement ◽  
Dynamical Relation

Measurement of a degenerate (or non-degenerate) discrete observable is investigated in the framework of quantum measurement theory short of collapse, i.e. premeasurement theory, based on a unitary evolution operator that includes the measurement interaction between object and measuring instrument. A pointer observable with eigen-projectors of, in general, many (or even infinitely) dimensional ranges is introduced as a new approach. It leads to redundant entanglement in the final state. As the first main result, the basic dynamical relation of the approach is derived. It is shown to be equivalent to the calibration condition, which is known to define general exact measurement. The latter is given a practical form. Complete measurement (premeasurement with objectification or collapse), which is in some sense implied by the premeasurement theory, performed on a subsystem of a bipartite object in a pure state is studied with particular attention to its effect on the opposite, interactionally unaffected subsystem. The change of state of the latter is derived for exact complete subsystem measurement, and it is shown that the change is the same as for the simplest, i.e. ideal measurement (this is the second main result). It is applied to the case of twin observables and thus distant measurement obtains a new, more satisfactory, foundation (the third main result). Distant measurement is a basic concept in the EPR phenomenon. The well-known importance of the latter implies importance of the former.

PARTONIC PICTURE OF GTMDS

2014 ◽  
Vol 25 ◽  
pp. 1460009 ◽  
Author(s):  
SIMONETTA LIUTI ◽  
ABHA RAJAN ◽  
AURORE COURTOY ◽  
GARY R. GOLDSTEIN ◽  
J. OSVALDO GONZALEZ HERNANDEZ
Keyword(s):  
Angular Momentum ◽  
Compton Scattering ◽  
Orbital Angular Momentum ◽  
Scattering Amplitude ◽  
Final State Interaction ◽  
Deeply Virtual Compton Scattering ◽  
Virtual Compton Scattering ◽  
Matrix Elements ◽  
Final State ◽  
Wigner Distributions

We argue that due to parity constraints, the helicity combination of the purely momentum space counterparts of the Wigner distributions — the generalized transverse momentum distributions — that describes the configuration of an unpolarized quark in a longitudinally polarized nucleon, can enter the deeply virtual Compton scattering amplitude only through matrix elements involving a final state interaction. The relevant matrix elements in turn involve light cone operators projections in the transverse direction, or they appear in the deeply virtual Compton scattering amplitude at twist three. Orbital angular momentum or the spin structure of the nucleon was a major reason for these various distributions and amplitudes to have been introduced. We show that twist three contributions to deeply virtual Compton scattering provide observables related to orbital angular momentum.

scholarly journals Analytical fragility assessment of structures under earthquake and tsunami loads: a case study on the Colombian Pacific coast

2019 ◽  
Vol 29 (2) ◽  
Author(s):  
Miguel Rivas ◽  
Patricia Luna ◽  
Juan Lizarazo-Marriaga
Keyword(s):  
Pacific Coast ◽  
Final State ◽  
New Approach ◽  
Inelastic Displacement ◽  
Flood Depth ◽  
Starting Point ◽  
Non Linear ◽  
San Andres ◽  
Colombian Pacific

This article presents a procedure for the fragility assessment of structures in response to earthquake and tsunami loads using the accumulation of inelastic displacement as a measure of damage. The proposed methodology considers a non-linear static analysis (pushover) for the case of the earthquake and a non-linear static load for the case of the tsunami, taking as starting point the final state of the structure after the occurrence of an earthquake. However, since the impulse force is the critical component of the tsunami load, a simplified approximation in terms of the flood depth is used to estimate the total of the tsunami load. By combining the effect of earthquake and tsunami hazard, a function is obtained relating the spectral acceleration of the earthquake, the flood depth of the tsunami and the drift. Finally, a case study of timber houses located in the municipality of San Andrés de Tumaco at the Colombian Pacific coast is analyzed to assess de proposed methodology. The fragility curve obtained allows a new approach to Multi-hazard risk assessment in areas susceptible to the occurrence of earthquake and tsunami.

On the Role of Different Strain Components, Material Plasticity, and Edge Effects When Predicting Machining-Induced Residual Stresses Using Finite Element Modeling

2017 ◽  
Vol 139 (7) ◽  
Author(s):  
Mohamed N. A. Nasr
Keyword(s):  
Relaxation Process ◽  
Orthogonal Cutting ◽  
Thermal Relaxation ◽  
Classical Approach ◽  
Final State ◽  
New Approach ◽  
One Dimensional ◽  
Strain Components ◽  
Cutting Direction

Finite element modeling (FEM) of machining-induced residual stresses (RS) takes place over two consecutive steps: a cutting step and a relaxation step. In the latter, the workpiece is left to cool down after deactivating all external loads. The current work focuses on the relaxation step, and how different strain components, material plasticity, and workpiece edge deflections affect the final state of different RS components. First, a two-dimensional arbitrary-Lagrangian–Eulerian (ALE) plane strain thermomechanical explicit model was used to simulate dry orthogonal cutting. After that, the relaxation process was modeled using three approaches: (1) the classical approach, (2) a new approach that is first presented here, and (3) a modified approach that was developed earlier by the current author. In the classical approach, the same exact machined workpiece is relaxed, considering all stress/strain components and material plasticity. On the other hand, the new approach uses a pure elastic one-dimensional thermal relaxation model, in the cutting direction, and assumes that the workpiece edges normal to the cutting direction remain so. The differences between the RS predicted by the new and classical approaches reflected the combined effects of the examined parameters. The role of each parameter was isolated using three different versions of the modified approach. The current findings confirmed that for orthogonal cutting, the stress relaxation process can be considered as a one-dimensional pure elastic thermal relaxation process. Also, the workpiece edges normal to the cutting direction deflect during relaxation, contributing to the final state of RS.

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