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On the geometry of the space-time and motion of the spinning bodies

100%
Trenčevski K.
Open Physics
|
2013
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vol. 11
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issue 3
296-316
EN
In this paper an alternative theory about space-time is given. First some preliminaries about 3-dimensional time and the reasons for its introduction are presented. Alongside the 3-dimensional space (S) the 3-dimensional space of spatial rotations (SR) is considered independently from the 3-dimensional space. Then it is given a model of the universe, based on the Lie groups of real and complex orthogonal 3 × 3 matrices in this 3+3+3-dimensional space. Special attention is dedicated for introduction and study of the space S × SR, which appears to be isomorphic to SO(3,ℝ) × SO(3,ℝ) or S 3 × S 3. The influence of the gravitational acceleration to the spinning bodies is considered. Some important applications of these results about spinning bodies are given, which naturally lead to violation of Newton’s third law in its classical formulation. The precession of the spinning axis is also considered.
2
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Mechanically changed band gap of single walled carbon nanotube: a third neighbor tight-binding approach

100%
Pakkhesal M., Ghayour R.
|
EN
Analytical derivation of electronic band gap of Single Walled Carbon Nanotube (SWCNT) under a small percent of uniaxial and torsional strains is in this paper. Our approach is based on a kind of π-Tight Binding (π-TB) approximation which includes interactions of the second and the third neighbors of each carbon atom in addition to the nearest ones. Implementing the approach of this paper, yields more precise results than those of other researches.
3
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A non-diagonal singularity-free model in torsion gravity

100%
Korunur M.
Open Physics
|
2012
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vol. 10
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issue 4
846-849
EN
In the context of torsion (teleparallel) gravity, we focus on discussing the spin effects of Dirac particles associated with the non-diagonal singularity-free model (Mars space-time). We see that the vector part depends on the radial r and z directions and the axial-vector will be along the radial direction, that is, it will be symmetric about radial direction. Furthermore, the t = 0 case of the Mars metric is considered, thence it is seen that the axial-vector vanishes.
4
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Phase space analysis of interacting dark energy in f(T) cosmology

88%
Jamil M., Yesmakhanova K., Momeni D., Myrzakulov R.
Open Physics
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2012
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vol. 10
|
issue 5
1065-1071
EN
In this paper, we examine the interacting dark energy model in f(T) cosmology. We assume dark energy as a perfect fluid and choose a specific cosmologically viable form f(T) = β√T. We show that there is one attractor solution to the dynamical equation of f(T) Friedmann equations. Further we investigate the stability in phase space for a general f(T) model with two interacting fluids. By studying the local stability near the critical points, we show that the critical points lie on the sheet u* = (c − 1)v* in the phase space, spanned by coordinates (u, v, Ω, T). From this critical sheet, we conclude that the coupling between the dark energy and matter c ∈ (−2, 0).
5
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Torsed Intraabdominal Testicular Tumor Diagnosed during Surgery Performed due to Suspicion of Acute Appendicitis

88%
Staniuk T., Szymański Ł., Trocha M.
Polish Journal of Surgery
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2012
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vol. 84
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issue 10
526-530
EN
Intra-abdominal neoplasmatic testicular torsion is a very rare clinical condition, which is normally not considered during differential diagnosis of acute appendicitis. The above-mentioned is most often observed in patients after puberty, without any previous specific symptoms apart from the absence of the testis in the scrotum and inguinal canal or periodic pain in the right lower abdomen. The study presented a case of a 22-year old male patient who was admitted and operated with suspicion of acute appendicitis. During surgery we observed intra-abdominal testicular torsion, both the testis and appendix were excised. Postoperative histopathological results were as follows: seminoma of the testis and normal appendix. The study presented available data concerning the above-mentioned rare clinical condition, as well as principles of diagnosis and treatment.
6
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DIC in validation of boundary conditions of numerical model of reinforced concrete beams under torsion

75%
Turoń B., Ziaja D., Buda-Ożóg L., Miller B., Turoń B., Ziaja D., Buda-Ożóg L., Miller B.
Archives of Civil Engineering
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2018
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vol. 64
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issue 4-II
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