Michalina Ślemp,
Michalina Ślemp
Institution: Institute of Advanced Materials, Faculty of Chemistry, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland
Email:
Andrzej Miniewicz
Andrzej Miniewicz
Institution: Institute of Advanced Materials, Faculty of Chemistry, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland
Email:
Marangoni bursting describes the spontaneous spread of a droplet of a binary mixture of alcohol/water deposited on a bath of oil, followed by its fast spontaneous fragmentation into a large number of smaller droplets in a self-similar way. Several papers have aimed to describe the physical phenomena...
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Marangoni bursting describes the spontaneous spread of a droplet of a binary mixture of alcohol/water deposited on a bath of oil, followed by its fast spontaneous fragmentation into a large number of smaller droplets in a self-similar way. Several papers have aimed to describe the physical phenomena underlying this spectacular phenomenon, in which two opposite effects, solutal and thermal Marangoni stresses, play competitive roles. We performed investigations of the Marangoni bursting phenomenon, paying attention to the surface temperature changes during bursting and after it. Fragmentation instabilities were monitored using a thermal camera for various initial alcohol/water compositions and at different stages of the process. We uncovered the role of thermocapillary Marangoni flows within the more viscous oil phase that are responsible for outward and inward shrinking of the periphery circle at the final stage of the phenomenon, enabling a more comprehensive understanding of the thermal Marangoni effect. Simulations of the Marangoni thermocapillary effect in an oil bath by solving coupled Navier–Stokes and heat transport equations using the COMSOL Multiphysics software platform support our experimental observations.
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3 days ago
S. Kavitha1*, R.K. Bhoopesh1 and K.S. Mohan2
Department of Electronics and Communication Engineering, Nandha Engineering College, Erode, Tamil Nadu, India
Department of Physics, Nandha Engineering College, Erode, Tamil Nadu, India
1 week ago
Muhammad Moin,
Muhammad Moin
Institution: Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu China; Department of Physics, University of Engineering and Technology, Lahore, Pakistan
Email:
Abdul Anwar,
Abdul Anwar
Institution: Department of Physics, University of Engineering and Technology, Lahore, Pakistan
Email:
Mehrunisa Babar,
Mehrunisa Babar
Institution: Department of Physics, University of Engineering and Technology, Lahore, Pakistan
Email:
Udayabhaskararao Thumu,
Udayabhaskararao Thumu
Institution: Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu China
Email:
Anwar Ali
Anwar Ali
Institution: Department of Physics, University of Engineering and Technology, Lahore, Pakistan
Email:
A first principle study intense on the density functional theory with Heydscuseria-Ernzerhof screened hybrid functional hybrid function (HSEO6) is used to assess the structural, Electronic, elastic, mechanical and optical responses of LaXOlt;subgt;3lt;/subgt; (X = Al, In, Ga) perovskite materials. T...
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A first principle study intense on the density functional theory with Heydscuseria-Ernzerhof screened hybrid functional hybrid function (HSEO6) is used to assess the structural, Electronic, elastic, mechanical and optical responses of LaXOlt;subgt;3lt;/subgt; (X = Al, In, Ga) perovskite materials. The compressive investigation under the external static isotropic pressure (P= 0 to 80GaP), phase stability, band structure and their important impact on the optical response of LaAlOlt;subgt;3lt;/subgt;, LaInOlt;subgt;3lt;/subgt; and LaGaOlt;subgt;3lt;/subgt;. Electronic band structure shows that LaXOlt;subgt;3lt;/subgt; (X = Al, In Ga) semiconductor with indirect band gap and an optically inactive response up to 20GPa, while the band gap becomes direct at 80GaP. There are gamma points (G-X-Q) at 80GPa and the band gap changes from indirect to direct nature. Under main desperation physical parameters of perovskite materials are well explained the response of TDOS, PDOS and EPDOS contour plots have been well understood for the full description of the band gap. It is further observed that the external pressure enhanced upto 40GPa both materials are significantly more mechanically stable compared to pristine LaXOlt;subgt;3lt;/subgt; (X = Al, In, Ga) at 0GPa. The optical properties of LaAlOlt;subgt;3lt;/subgt;, LaGaOlt;subgt;3 lt;/subgt;and LaInOlt;subgt;3lt;/subgt;, dielectric coefficient lt;igt;(εlt;subgt;1lt;/subgt;, iεlt;subgt;2lt;/subgt;)lt;/igt; have been employed along with the optical responses like absorption, energy loss function, reflectivity and reflective index are obtained in the energy scale from 0 to 60 eV. It was observed that static dielectric constant decreases with the decrease in optical band gap. The optical tunings under the effect of pressure which are good candidates in practical optoelectronic applications are extensively used and interpreted by the calculation of the dielectric function.
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1 week ago
Gemechu Feyisa Yadeta
Gemechu Feyisa Yadeta
Institution: Physics Department, College of Natural and Computational Sciences, Mattu University, Mattu
Email: info@rnfinity.com
In this work, the alpha particle-induced reaction on Cadmium-116 in the energy range 20-40 MeV has been studied. The excitation function for the following reaction channels of this type have been studied in the energy range of 15 MeV-40 MeV are; 48-Cd-116(α, n) 50-Sn-119. This reaction has a total ...
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In this work, the alpha particle-induced reaction on Cadmium-116 in the energy range 20-40 MeV has been studied. The excitation function for the following reaction channels of this type have been studied in the energy range of 15 MeV-40 MeV are; 48-Cd-116(α, n) 50-Sn-119. This reaction has a total number of exciton six, number of neutron one and number of holes also one. 48-Cd-116(α, 2n + p) 49-In-117. In this reaction (TD = 10, Ex1 = 3 and Ex2 = 3). 48-Cd-116(α, 3n) 50-Sn-117. The exciton number of this reaction is (TD = 10, Ex1 = 3 and Ex2 = 3) 48-Cd-116(α, 3n + p) 49-In-116. It has an exciton number of (TD = 12 Ex1 = 4 and Ex2 = 4) 48-Cd-116(α, n + α) 48-Cd-115. This reaction has (TD = 14, Ex1 = 1, Ex2 = 5 and Ex3 = 4) were studied and comparative analysis was performed for reaction channels of 116-Cd target nuclei. The experimentally measured excitation functions obtained from the EXFOR data source, IAEA, were compared with the theoretical calculations with and without the inclusion of pre-equilibrium emission of particles, made by the COMPLET code. The level density parameter is varied to obtain good agreement between the calculated and measured data with minimum effort on the fitting parameter.
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6 months ago
Helena Drueke,
Helena Drueke
Institution: Institute of Physics, University of Rostock, 18051 Rostock, Germany
Email: helena.drueke@uni-rostock.de
Dieter Bauer
Dieter Bauer
Institution: Institute of Physics, University of Rostock, 18051 Rostock, Germany
Email: dieter.bauer@uni-rostock.de
"Periodic driving may cause topologically protected, chiral transport along edges of a 2D lattice that, without driving, would be topologically trivial. We study what happens if one adds a different on-site potential along the diagonal of such a 2D grid. In addition to the usual bulk and edge states...
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"Periodic driving may cause topologically protected, chiral transport along edges of a 2D lattice that, without driving, would be topologically trivial. We study what happens if one adds a different on-site potential along the diagonal of such a 2D grid. In addition to the usual bulk and edge states, the system then also exhibits doublon states, analogous to two interacting particles in one dimension. A particle initially located at an edge propagates along the system's boundary. Its wavefunction splits when it hits the diagonal and continues propagating simultaneously along the edge and the diagonal. The strength of the diagonal potential determines the ratio between both parts. We show that for specific values of the diagonal potential, hopping onto the diagonal is prohibited so that the system effectively separates into two triangular lattices. For other values of the diagonal potential, we find a temporal delay between the two contributions traveling around and through the system. This behavior could enable the steering of topologically protected transport of light along the edges and through the bulk of laser-inscribed photonic waveguide arrays."
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2 years ago
Meir Shimon
Meir Shimon
Institution: School of Physics and Astronomy, Tel Aviv University,
Email: meirs@tauex.tau.ac.il
In the standard cosmological model the dark energy (DE) and nonrelativistic (NR) matter densities are determined to be comparable at the present time, in spite of their greatly different evolution histories. This ‘cosmic coincidence’ enigma could be explained as a non-anthropic observational se...
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In the standard cosmological model the dark energy (DE) and nonrelativistic (NR) matter densities are determined to be comparable at the present time, in spite of their greatly different evolution histories. This ‘cosmic coincidence’ enigma could be explained as a non-anthropic observational selection effect: We show that in a suitably chosen frame the Universe is at its most probable epoch when the Hubble radius attains a maximum, at the epoch when the energy densities of DE and NR
matter are comparable.
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2 years ago
Oleg Lebedev,
Oleg Lebedev
Institution: Department of Physics and Helsinki Institute of Physics, Gustaf Hallstromin katu 2a, FI-00014
Email: info@res00.com
Jong-Hyun Yoon
Jong-Hyun Yoon
Institution: Department of Physics and Helsinki Institute of Physics, Gustaf Hallstromin katu 2a, FI-00014
Email: info@res00.com
We consider dark matter production during the inflation oscillation epoch. It is conceivable that renormalizable interactions between dark matter and inflation may be negligible. In this case, the leading role is played by higher dimensional operators generated by gravity and thus suppressed by the ...
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We consider dark matter production during the inflation oscillation epoch. It is conceivable that renormalizable interactions between dark matter and inflation may be negligible. In this case, the leading role is played by higher dimensional operators generated by gravity and thus suppressed by the Planck scale. We focus on dim-6 operators and study the corresponding particle production in perturbative and non–perturbative regimes. We find that the dark matter production rate is dominated by non–derivative operators involving higher powers of the inflation field. Even if they appear with small Wilson coefficients, such operators can readily account for the correct dark matter abundance.
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2 years ago
Joseph E Brierly
Joseph E Brierly
Institution: Joseph E Brierly, Ph.D., Wayne State University,
Email: jbrierly@comcast.net
This article gives a overall picture of how the universe works from the likelihood that our universe is infinite dimensional at the nanometer scale of an indestructible quark. The article explains that we only can perceive for sure up to 4 dimensions of physical reality. However, the speculation in ...
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This article gives a overall picture of how the universe works from the likelihood that our universe is infinite dimensional at the nanometer scale of an indestructible quark. The article explains that we only can perceive for sure up to 4 dimensions of physical reality. However, the speculation in this article seems very clear that likely we are seeing activity in the 5th dimension in particle physics experimentation explaining the EPR paradox and other mysteries seen in particle physics. Finally, the article shows why the Mendeleev Chart has historically listed possible stable atoms without giving the exact number possible. The way protons and other hadrons are composed of six quarks and six antiquarks held together by gluons leads to the inevitable conclusion that
only 108 stable atoms can exist. Being stable means the protons in an atom are composed of 3 quarks/antiquarks having charge 1. Recent discoveries in particle physics research demonstrates that there exists a particle named the pentaquark composed of five quarks. The article explains that pentaquarks have been identified in recent particle research. It is not known yet whether the pentaquark leads to a different proton that leads in turn to a pentaquark atom. New particle research will likely answer this question.
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2 years ago
Robert J Buenker Buenker
Robert J Buenker Buenker
Institution: Faculty of C-Mathematics and Natural Sciences, Bergische Universität Wuppertal,
Email: rjbuenker@gmail.com
A number of the most often cited results of relativity theory deal with the relationships between energy, momentum and inertial mass. The history of how Einstein and Planck came to these conclusions is reviewed. It is pointed out that considerations of how the speed of light is affected by the motio...
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A number of the most often cited results of relativity theory deal with the relationships between energy, momentum and inertial mass. The history of how Einstein and Planck came to these conclusions is reviewed. It is pointed out that considerations of how the speed of light is affected by the motion of the Earth played a determining role in these developments. After the Michelson-Morley null-interference result became available, Voigt introduced a new space-time transformation by amending the classical Galilean transformation so that the speed of light in free space has the same value of c regardless of the state of motion of both the light source and the observer. This led to the Lorentz transformation which has been the cornerstone of relativity theory for
the past century. A thought experiment is presented which proves, however, that there are many situations for which the measured speed of light is NOT equal to c. Furthermore, it is pointed out that the rate of an inertial clock cannot change spontaneously, which result is perfectly compatible with Newton’s First Law of Kinetics (Law of Inertia). This result contradicts the space-time mixing characteristic of the Lorentz transformation and leads to the conclusion that events which are spontaneous for one inertial frame will also be so for every other one. The uniform scaling procedure is a generalization of this result for all other physical properties than elapsed times. Its application shows that the commonly accepted relationships between energy and momentum are
only special cases in which it is assumed that the observer is stationary in the rest frame in which force has been applied to cause the object’s acceleration
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2 years ago
Berov G Lyubomir
Berov G Lyubomir
Institution: Engineer, Independent Innovative Ideas Researcher, Smolyan 4700,
Email: my_kaly1@mbox.contact.bg
The present, at any particular moment, is the realization of one of the many intentions of the All-creating Intellect. Here "realization" specifically means the materialization or the appearance of an object in the material world, which had not existed until now. This newly born material object exis...
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The present, at any particular moment, is the realization of one of the many intentions of the All-creating Intellect. Here "realization" specifically means the materialization or the appearance of an object in the material world, which had not existed until now. This newly born material object exists only for the duration of the moment of "now". This moment is infinitely short, or, if we use a concept from calculus, it is infinitesimal in duration. In my hypothesis, this new object is a product of a specific energy field of the All-creating Intellect. We call this particular energy field Time.
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2 years ago