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Inertial Propagation of Streamers after External Voltage Termination
Issue:
Volume 2, Issue 5, September 2013
Pages:
242-247
Received:
25 June 2013
Published:
20 July 2013
Abstract: The fundamental processes of streamer propagation in the streamer chamber after external voltage termination are considered on the basis of a plasma-waveguide model of gas electric breakdown. The model analyses the time dependence of streamer radiation under the mentioned conditions. The velocity and time scales of the process have been defined, and the electron density is estimated in the plasma waveguide formed before the external voltage termination. Earlier shortcomings of theories of this phenomenon are corrected.
Abstract: The fundamental processes of streamer propagation in the streamer chamber after external voltage termination are considered on the basis of a plasma-waveguide model of gas electric breakdown. The model analyses the time dependence of streamer radiation under the mentioned conditions. The velocity and time scales of the process have been defined, an...
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Relic Streams of Photons and Neutrinos
Issue:
Volume 2, Issue 5, September 2013
Pages:
248-250
Received:
4 June 2013
Published:
30 July 2013
Abstract: The possible reasons of features of the nature of neutrino are discussed. The estimation of modern density of the number of neutrinos which differs from traditional calculation methods in thermodynamics is proposed. The obtained results in the order of size will be co-ordinated with calculation in thermodynamics. The explanation of the nature of small neutrino mass is offered.
Abstract: The possible reasons of features of the nature of neutrino are discussed. The estimation of modern density of the number of neutrinos which differs from traditional calculation methods in thermodynamics is proposed. The obtained results in the order of size will be co-ordinated with calculation in thermodynamics. The explanation of the nature of sm...
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Sessile Axisymmetric Drops in Microgravity Conditions
Amelia Carolina Sparavigna
Issue:
Volume 2, Issue 5, September 2013
Pages:
251-254
Received:
5 July 2013
Published:
10 August 2013
Abstract: Fluid interfaces are producing several static and dynamic phenomena. These interfaces are governing, for instance, the shape of sessile droplets and the spread of liquids on surfaces. In this paper, we will discuss the shape of sessile axisymmetric drops on a solid surface and how it is depending on gravity, obtaining results that are in agreement with experimental observations under conditions of microgravity.
Abstract: Fluid interfaces are producing several static and dynamic phenomena. These interfaces are governing, for instance, the shape of sessile droplets and the spread of liquids on surfaces. In this paper, we will discuss the shape of sessile axisymmetric drops on a solid surface and how it is depending on gravity, obtaining results that are in agreement ...
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Modification of Einstein's E= mc2 to E =1/22 mc2
Issue:
Volume 2, Issue 5, September 2013
Pages:
255-263
Received:
28 July 2013
Published:
20 August 2013
Abstract: The Egyptian engineering scientist and theoretical physicist Mohamed El Naschie has found a definite resolution to the missing dark energy of the cosmos based on a revision of the theory of Relativity. Einstein’s equation of special relativity E= mc2, where m is the controversial rest mass and c is the velocity of light developed in smooth 4D space-time was transferred by El Naschie to a rugged Calabi-Yau and K3 fuzzy Kähler manifold. The result is an accurate, effective quantum gravity energy-mass relation which correctly predicts that 95.4915028% of the energy in the cosmos is the missing hypothetical dark energy. The agreement with WMAP and supernova measurements is astounding. Different theories are used by El Naschie to check the calculations and all lead to the same quantitative result. Thus the theories of varying speed of light, scale relativity, E-infinity theory, M-theory, Heterotic super strings, quantum field in curved space-time, Veneziano’s dual resonance model and Nash’s Euclidean embedding all reinforce, without any reservation, the above mentioned theoretical result of El Naschie which in turn is in total agreement with the most sophisticated cosmological measurement. Incidentally these experimental measurements and analysis were awarded the 2011 Nobel Prize in Physics to Adam Riess, Brian Schmidt, and Saul Perlmutter.
Abstract: The Egyptian engineering scientist and theoretical physicist Mohamed El Naschie has found a definite resolution to the missing dark energy of the cosmos based on a revision of the theory of Relativity. Einstein’s equation of special relativity E= mc2, where m is the controversial rest mass and c is the velocity of light developed in smooth 4D space...
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Bianchi Type I Bulk Viscous Barotropic Fluid Cosmological Model with Varying Λ and Functional Relation on Hubble Parameter in Self-Creation Theory of Gravitation
Mukunda Sudam Borkar,
Nilesh Kawaduji Ashtankar
Issue:
Volume 2, Issue 5, September 2013
Pages:
264-269
Received:
28 July 2013
Published:
30 August 2013
Abstract: We have investigated Bianchi type I bulk viscous barotropic fluid cosmological model with varying Λ and functional relation on Hubble parameter in self-creation theory of gravitation. It is observed that the scalar function ϕ(t) affected the physical parameters of the universe and our model may have more than three spatial-dimensions in the beginning which is a theoretical evidence pointed out in the geometry of universe. The propose variation law for Hubble parameter leads cosmological model which is dominated by decelerating phase at initial stage and at later stage, the universe has accelerating phase and the universe expanding exponentially with acceleration supporting the observational data. Also other geometrical and physical properties of the model have been evaluated.
Abstract: We have investigated Bianchi type I bulk viscous barotropic fluid cosmological model with varying Λ and functional relation on Hubble parameter in self-creation theory of gravitation. It is observed that the scalar function ϕ(t) affected the physical parameters of the universe and our model may have more than three spatial-dimensions in the beginni...
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Effect of MgO Addition on the Mechanical and Thermal Properties of Mullite Synthesised through Reaction Sintering of Al2O3 and Algerian Kaolin
A. Ouali,
M. Heraiz,
F. Sahnoune,
H. Belhouchet,
M. Fatmi,
N. Saheb
Issue:
Volume 2, Issue 5, September 2013
Pages:
270-275
Received:
19 June 2013
Published:
20 September 2013
Abstract: The influence of MgO addition on the structure and properties of mullite prepared through reaction sintering of Algerian kaolin and Al2O3 was investigated. The raw powders were wet ball milled, dried and cold compacted using a uniaxial press. The green compacts were sintered 8 hours at 1600 and 1650°C. The microstructure of samples was characterized using a scanning electron microscope. Mechanical and thermal properties were characterized using Vicker’s hardness tester, a universal testing machine and a dilatometer. It was found that the increase of MgO content from 0 to 3 wt-% increased the hardness of samples sintered 8 hours at 1600°C from 1039 to 1316.57 HV. Also, the increase of MgO content in samples sintered 8 hours at 1600 and 1650°C increased the compressive strength up to a maximum then decreased it. For a sintering temperature of 1600°C, the increase of MgO content up to 2 wt-% increased the flexural strength, but a further increase of MgO to 3 wt-% decreased it again, while for a sintering temperature of 1650°C, the increase of MgO content from 0 to 3 wt-% increased the flexural strength from 103.45 to 472.25 MPa. Amongst MgO containing samples, the increase of MgO content increased the coefficient of thermal expansion; however, it remained lower than the coefficient of thermal expansion of the sample without MgO addition.
Abstract: The influence of MgO addition on the structure and properties of mullite prepared through reaction sintering of Algerian kaolin and Al2O3 was investigated. The raw powders were wet ball milled, dried and cold compacted using a uniaxial press. The green compacts were sintered 8 hours at 1600 and 1650°C. The microstructure of samples was characterize...
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