A new effective method for determination of the Bjorken sum rule from experimental data

2019 ◽  
Author(s):  
D. Kotlorz ◽  
S. V. Mikhailov ◽  
O. V. Teryaev ◽  
A. Kotlorz
Keyword(s):  
Experimental Data ◽  
Sum Rule ◽  
Bjorken Sum Rule

scholarly journals Optimized determination of the polarized Bjorken sum rule

2020 ◽  
Vol 1435 ◽  
pp. 012017
Author(s):  
D Kotlorz ◽  
S V Mikhailov ◽  
A Kotlorz
Keyword(s):  
Sum Rule ◽  
Bjorken Sum Rule

scholarly journals A THERMODYNAMICAL BAG MODEL FOR THE NUCLEON SPIN

1996 ◽  
Vol 11 (02) ◽  
pp. 147-156 ◽  
Author(s):  
V. DEVANATHAN ◽  
J.S. McCARTHY
Keyword(s):  
Experimental Data ◽  
Equations Of State ◽  
Recent Experimental Data ◽  
Nucleon Spin ◽  
Bag Model ◽  
Sum Rule ◽  
Bjorken Sum Rule

A thermodynamical bag model was developed to study the nucleon spin. Equations of state for the bag are deduced and solved self-consistently. The recent experimental data of the SMC and the E143 collaboration and the Bjorken sum rule are completely explained within the framework of the model.

scholarly journals Bjorken sum rule in QCD frameworks with analytic (holomorphic) coupling

2018 ◽  
Vol 33 (18n19) ◽  
pp. 1850112 ◽  
Author(s):  
César Ayala ◽  
Gorazd Cvetič ◽  
Anatoly V. Kotikov ◽  
Binur G. Shaikhatdenov
Keyword(s):  
Experimental Data ◽  
Perturbation Theory ◽  
Perturbative Qcd ◽  
Light Front ◽  
Analytic Perturbation Theory ◽  
Sum Rule ◽  
Bjorken Sum Rule ◽  
Analytic Perturbation ◽  
Good Agreement

We investigate the polarized Bjorken sum rule (BSR) in three approaches to QCD with analytic (holomorphic) coupling: Analytic Perturbation Theory (APT), Two-delta analytic QCD (2[Formula: see text]anQCD) and Three-delta lattice-motivated analytic QCD in the three-loop and four-loop MOM scheme (3l3[Formula: see text]anQCD, 4l3[Formula: see text]anQCD). These couplings do not have unphysical (Landau) singularities, and have finite values when the transferred momentum goes to zero, which allows us to explore the infrared regime. With the exception of APT, these theories at high momenta practically coincide with the underlying perturbative QCD (pQCD) in the same scheme. We apply them in order to verify the Bjorken sum rule within the range of energies available in the data collected by the experimental JLAB collaboration, i.e. [Formula: see text] and compare the results with those obtained by using the perturbative QCD coupling. The results of the new frameworks with respective couplings (2[Formula: see text] and 3[Formula: see text]) are in good agreement with the experimental data for [Formula: see text] already when only one higher-twist term is used. In the low-[Formula: see text] regime [Formula: see text], we use [Formula: see text]PT-motivated expression or an expression motivated by the light-front holography (LFH) QCD used earlier in the literature.

Equilibrium Sorptions in Heterogeneous Ion Exchange Membranes

1992 ◽  
Vol 57 (9) ◽  
pp. 1905-1914
Author(s):  
Miroslav Bleha ◽  
Věra Šumberová
Keyword(s):  
Experimental Data ◽  
Ion Exchange ◽  
Total Content ◽  
Distribution Coefficients ◽  
Exchange Capacity ◽  
Ion Exchange Membranes ◽  
Ion Exchange Capacity ◽  
Equilibrium Sorption ◽  
Inhomogeneity Factor

The equilibrium sorption of uni-univalent electrolytes (NaCl, KCl) in heterogeneous cation exchange membranes with various contents of the ion exchange component and in ion exchange membranes Ralex was investigated. Using experimental data which express the concentration dependence of equilibrium sorption, validity of the Donnan relation for the systems under investigation was tested and values of the Glueckauf inhomogeneity factor for Ralex membranes were determined. Determination of the equilibrium sorption allows the effect of the total content of internal water and of the ion-exchange capacity on the distribution coefficients of the electrolyte to be determined.

Numerical evaluation of hydrodynamic characteristics of planing hulls by using a hybrid method

2021 ◽  
pp. 147509022199024
Author(s):  
Emre Kahramanoglu ◽  
Silvia Pennino ◽  
Huseyin Yilmaz
Keyword(s):  
Experimental Data ◽  
Hybrid Method ◽  
Design Stage ◽  
Hydrodynamic Characteristics ◽  
Calm Water ◽  
Preliminary Design Stage ◽  
Reduction Function ◽  
Hull Forms ◽  
Good Agreement

The hydrodynamic characteristics of the planing hulls in particular at the planing regime are completely different from the conventional hull forms and the determination of these characteristics is more complicated. In the present study, calm water hydrodynamic characteristics of planing hulls are investigated using a hybrid method. The hybrid method combines the dynamic trim and sinkage from the Zarnick approach with the Savitsky method in order to calculate the total resistance of the planing hull. Since the obtained dynamic trim and sinkage values by using the original Zarnick approach are not in good agreement with experimental data, an improvement is applied to the hybrid method using a reduction function proposed by Garme. The numerical results obtained by the hybrid and improved hybrid method are compared with each other and available experimental data. The results indicate that the improved hybrid method gives better results compared to the hybrid method, especially for the dynamic trim and resistance. Although the results have some discrepancies with experimental data in terms of resistance, trim and sinkage, the improved hybrid method becomes appealing particularly for the preliminary design stage of the planing hulls.

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.

Theoretical determination of the structures of CaSiO3 perovskites

2006 ◽  
Vol 62 (6) ◽  
pp. 1025-1030 ◽  
Author(s):  
Razvan Caracas ◽  
Renata M. Wentzcovitch
Keyword(s):  
Crystal Structure ◽  
Experimental Data ◽  
Density Functional Theory ◽  
Density Functional ◽  
Theoretical Determination ◽  
Functional Theory ◽  
Starting Point ◽  
Atomic Coordinates ◽  
The Ideal

Density functional theory is used to determine the possible crystal structure of the CaSiO3 perovskites and their evolution under pressure. The ideal cubic perovskite is considered as a starting point for studying several possible lower-symmetry distorted structures. The theoretical lattice parameters and the atomic coordinates for all the structures are determined, and the results are discussed with respect to experimental data.

Excited charm baryons in semileptonic Λb decay and their contribution to a Bjorken sum rule

1991 ◽  
Vol 254 (1-2) ◽  
pp. 215-219 ◽  
Author(s):  
Nathan Isgur ◽  
Mark B. Wise ◽  
Michael Youssefmir
Keyword(s):  
Sum Rule ◽  
Bjorken Sum Rule ◽  
Charm Baryons
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