Parton densities and structure functions of nucleons and light nuclei based on the modified chiral quark-exchange model

2015 ◽  
Vol 92 (1) ◽  
Author(s):  
H. Nematollahi ◽  
M. M. Yazdanpanah
Keyword(s):  
Structure Functions ◽  
Exchange Model ◽  
Light Nuclei

The Structure Functions of 3 He and 3 H Nuclei in the Constituent Quark Exchange Model

2013 ◽  
Vol 55 (2) ◽  
pp. 85-100 ◽  
Author(s):  
M. Modarres ◽  
M. Rasti ◽  
M. M. Yazdanpanah
Keyword(s):  
Constituent Quark ◽  
Structure Functions ◽  
Exchange Model

scholarly journals Structure functions for light nuclei

2010 ◽  
Vol 82 (5) ◽  
Author(s):  
S. A. Kulagin ◽  
R. Petti
Keyword(s):  
Structure Functions ◽  
Light Nuclei

THE ROLE OF FERMI MOTION ON THE STRUCTURE FUNCTIONS OF 3He AND 3H NUCLEI IN THE QUARK EXCHANGE FRAMEWORK

2013 ◽  
Vol 22 (06) ◽  
pp. 1350037 ◽  
Author(s):  
M. MODARRES ◽  
M. RASTI
Keyword(s):  
Experimental Data ◽  
Wave Function ◽  
Three Dimensional ◽  
Structure Functions ◽  
Exchange Model ◽  
Coordinate Space ◽  
Nuclear Wave Function ◽  
Fermi Motion ◽  
Nucleon Wave Function

The quark exchange model and the full three-nucleon wave function in the configuration space are used to evaluate the role of Fermi motion on the structure functions (SFs) of helium-3 and tritium nuclei. The three-nucleon wave function is obtained from the solution of the Faddeev equations with the Malfliet–Tjon-type potential, by using the three-dimensional approach as a function of the magnitudes of the Jacobi momenta vectors and the angle between them. In this calculation, the initial valence quarks inputs are taken from the GRV's (Glück, Reya and Vogt) fitting procedure and the next-to-leading order (NLO) QCD calculation on [Formula: see text], which give a very good fit to the available experimental data in the (x, Q2)-plane. The role of Fermi motion on the EMC ratio of the SFs of 3 He and 3 H nuclei are analyzed through the NLO expansion of the nuclear wave function in the coordinate space. A good agreement between the calculated EMC ratios, the corresponding experimental data and the theoretical results is found. Finally, the ratios of the SFs of the neutron to the proton (with the isospin symmetry assumption) with and without the Fermi motion effect, are also calculated, and they are compared with the available experimental data. Our results show that the roles of the Fermi motion in the framework of the quark exchange model for the calculations of the nuclear SFs are important.

Heavy Flavour Effects in the Virtual Photon Structure Functions to NLO in QCD

2009 ◽  
Author(s):  
Tsuneo Uematsu ◽  
Yoshio Kitadono ◽  
Ken Sasaki ◽  
Takahiro Ueda
Keyword(s):  
Virtual Photon ◽  
Structure Functions ◽  
Photon Structure

Double exchange model and the unique properties of the manganites

2001 ◽  
Vol 171 (2) ◽  
pp. 121 ◽  
Author(s):  
Yurii A. Izyumov ◽  
Yu.N. Skryabin
Keyword(s):  
Double Exchange ◽  
Exchange Model

Matrix metalloproteinases: structure, functions and genetic polymorphism

2017 ◽  
pp. 14-23
Author(s):  
А.С. Шадрина ◽  
И.В. Терешкина ◽  
Я.З. Плиева ◽  
Д.Н. Кушлинский ◽  
Д.О. Уткин ◽  
...  
Keyword(s):  
Genetic Polymorphism ◽  
Matrix Metalloproteinases ◽  
Active Center ◽  
Human Body ◽  
Enzymatic Catalysis ◽  
Structure Functions ◽  
Zinc Ion ◽  
Etiological Factors ◽  
Mmp Genes

Матриксные металлопротеиназы (ММП) - ферменты класса гидролаз, осуществляющие ферментативный катализ с помощью связанного в активном центре иона цинка. Функции ММП разнообразны, и нарушение баланса их активности может быть одним из этиологических факторов различных заболеваний. В данном обзоре рассмотрена классификация ММП человека, особенности их структуры и регуляции, а также роль в физиологических и патологических процессах в организме человека. Приведен перечень наиболее изученных на настоящий момент полиморфных вариантов генов MMП, описаны их функциональные эффекты и представлены результаты ассоциативных исследований. Matrix metalloproteinases (MMPs) are enzymes of the hydrolase class that carry out enzymatic catalysis with the help of a zinc ion bound in the active center. MMP functions are diverse, and a disturbance in the balance of their activity may be one of the etiological factors of various diseases. In this review, the classification of human MMP, the features of their structure and regulation, as well as the role in physiological and pathological processes in the human body are considered. A list of the most studied polymorphic versions of MMP genes has been given, their functional effects have been described, and the results of associative studies have been presented.

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