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Inflation in Non-de Sitter Background with Coherent States

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Communications in Theoretical Physics 2016年第3期65卷 308-314页

作者： e.Yusofi m.mohsenzadeh m.R.Tanhayi Department of Physics Ayatollah Amoli BranchIslamic Azad University Department of Physics Qom BranchIslamic Azad University Department of Physics Islamic Azad UniversityCentral Tehran Branch

We use the excited coherent states built over the initial non-de Sitter modes,to study the modification of spectra of primordial scalar ***-de Sitter modes are actually the asymptotic solution of the inflaton field equation[*** energy Phys.09（2014） 020].We build excited coherent states over the non-de Sitter modes and despite the Jack of interactions in the Lagrangian,we find a non-zero one-point *** is shown that the primordial non-Gaussianity resulting from excited-de Sitter modes depend both of time and background *** is very tiny of order（≤10^-24）,at the Planck initial fixed time that confirmed by resent observations for single field inflation but it grows in the present ***,our results at the leading order are similar to what obtained with general initial states and in the dS limit leads to standard results[***.1202（2012） 005].We will show that the non-dS modes and its resulting spectrum.a.e.more usable for far past time limit.

关键词： inflation initial states planck time background space-time

Abundant exact Traveling Wave Solutions of Generalized Bretherton equation via Improved (G′/G)-expansion method

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Communications in Theoretical Physics 2012年第2期57卷 173-178页

作者： m.Ali Akbar Norhashidah Hj.mohd.Ali e.m.e.Zayed School of mathematical Sciences Universiti Sains MalaysiaMalaysia mathematics Department Faculty of ScienceZagazig UniversityZagazigEgypt

In this article, we construct abundant exact traveling wave solutions involving free parameters to the generalized Bretherton equation via the improved (G′/G)-expansion method. The traveling wave solutions are presented in terms of the trigonometric, the hyperbolic, and rational functions. When the parameters take special values, the solitary waves are derived from the traveling waves.

关键词： improved (G'/G)-expansion method travelling wave solutions the Bretherton equation nonlinearevolution equations

Coexistence and fluctuations phenomena with Davidson-like potentials in quadrupoleoctupole deformed nuclei

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Communications in Theoretical Physics 2021年第3期73卷 105-118页

作者： m m Hammad W H mansour e m el-maghraby H A motaweh Ayman A Aly Faculty of Science Mathematics DepartmentDamanhour UniversityEgypt Faculty of Science Physics DepartmentDamanhour UniversityEgypt

The energy spectra of three types of two-dimensional potentials(we will call them‘Davidson-like potentials’(DLPs)),characterized by four minima separated by barriers,are *** predictions for spectra and wave functions are obtained by using the nine-point finite-difference *** these potentials,with the existence of a single configuration,a transition of spectra,as a function of barrier height,is covered from tunneling splitting modes to fluctuations phenomena,with equal peaks wave functions,crossing to the spectra of purely anharmonic oscillator potentials(AOPs).A different type of phase transition occurs when two(or more)configurations *** the change of the parameters,a transition of spectra is covered from coexistence phenomena of two distinct quantum tunneling modes to fluctuations phenomena,with unequal peaks wave functions,crossing to the spectra of purely *** DLPs,a particular application of the coherent quadropole-octupole model to describe energy bands with alternating parity of the nuclei^(100)mo,^(146,148)Nd,^(148,150)Sm,^(220)Ra,^(220,222)Rn,and^(220,222)Th is *** global parametrization of the model for the selected nuclei is achieved.

关键词： quantum phase transitions fluctuations phenomena coherent quadrupole-octupole motion model coexistence phenomena

Study of fluctuations in the martian magnetosheath using a kurtosis technique:mars express observations

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earth and Planetary Physics 2022年第1期6卷 28-41页

作者： A.m.S.Franco e.echer m.J.A.Bolzan m.Fraenz National Institute for Space Research(INPe) Sao Jose dos CamposBrazil Federal University of Jatai JataiBrazil max Planck Institute for Solar System Research GöttingenGermany

Planetary magnetosheaths are characterized by high plasma wave and turbulence *** martian magnetosheath is no exception;both upstream and locally generated plasma waves have been observed in the region between its bow shock and magnetic boundary layer,its induced *** statistical study of wave activity in the martian magnetosheath is based on 12 years(2005-2016)of observations made during mars express(meX)crossings of the planet’s magnetosheath-in particular,data on electron density and temperature data collected by the electron spectrometer(eLS)of the plasma analyzer(ASPeRA-3)experiment on board the meX spacecraft.A kurtosis parameter has been calculated for these plasma *** value indicates intermittent behavior in the data when it is higher than 3(the value for a normal or Gaussian distribution).The variation of wave activity occurrence has been analyzed in relation to solar cycle,martian orbit,and distance to the bow ***-Gaussian properties are observed in the magnetosheath of mars on all analyzed scales,especially in those near the proton gyrofrequency in the upstream region of the martian *** also report that non-Gaussian behavior is most prominent at the smaller scales(higher frequencies).A significant influence of the solar cycle was also observed;the kurtosis parameter is higher during declining and solar maximum phases,when the presence of disturbed solar wind conditions,caused by large scale solar wind structures,*** kurtosis decreases with increasing distance from the bow shock,which indicates that the intermittence level is higher near the bow *** the electron temperature data the kurtosis is higher near the perihelion due to the higher incidence of eUV when the planet is closer to the Sun,which causes a more extended exosphere,and consequently increases the wave activity in the magnetosheath and its upstream *** extended exosphere seems to play a lower effect in the electron den

关键词： mars magnetosheath kurtosis ULF waves

Antimonene-based saturable absorber for a soliton mode-locked and Q-switched fiber laser in the 2 μm wavelength region

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Chinese Physics B 2023年第6期32卷 259-269页

作者： H Ahmad B Nizamani m Z Samion N Yusoff m F Ismail Photonics Research Centre Universiti Malaya50603 Kuala LumpurMalaysia Physics Department Faculty of ScienceUniversiti Malaya50603 Kuala LumpurMalaysia Distinguished Visiting Professor Universiti Kuala Lumpur British Malaysian Institute(UniKL BMI)Batu 8Jln Sungai Pusu53100SelangorMalaysia

We demonstrate antimonene as a saturable absorber(SA) to generate an ultrafast mode-locked and Q-switched laser in the 2 μm wavelength region. The two antimonene-based SAs were prepared and inserted separately in a thulium–holmiumdoped fiber laser to produce the pulsed laser. Antimonene was coated onto a tapered fiber to generate soliton mode-locked pulses and used in thin-film form for the generation of Q-switched pulses. The mode-locking was stable within a pump power of 267 m W–511 m W, and the laser operated at a central wavelength of 1897.4 nm. The mode-locked laser had a pulse width of 1.3 ps and a repetition rate of 12.6 mHz, with a signal-to-noise ratio of 64 d B. Q-switched laser operation was stable at a wavelength of 1890.1 nm within a pump power of 312 m W–381 m W. With the increase in pump power from 312 m W to 381 m W, the repetition rate increased to a maximum of 56.63 k Hz and the pulse width decreased to a minimum value of 2.85 μs. Wide-range tunability of the Q-switched laser was also realized within the wavelength range of1882 nm–1936 nm.

关键词： mode-locking Q-switched fiber laser optical saturable absorber

Remaining Phosphorus estimate Through multiple Regression Analysis

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Pedosphere 2006年第5期16卷 566-571页

作者： m.e.ALVeS A.LAVOReNTI Departamento de Ciencias exatas Escola Superior de Agriculture‘Luiz de Queiroz’-ESALQ/USPPiracicaba (SP) 13418-900 (Brazil)

The remaining phosphorus (Prem), P concentration that remains in solution after shaking soil with 0.01 mol L-1 CaCl2 containing 60μg mL-1 P, is a very useful index for studies related to the chemistry of variable charge soils. Although the Prem determination is a simple procedure, the possibility of estimating accurate values of this index from easily and/or routinely determined soil properties can be very useful for practical purposes. The present research evaluated the Prem estimation through multiple regression analysis in which routinely determined soil chemical data, soil clay content and soil pH measured in 1 mol L-1 NaF (pHNaF) figured as Prem predictor variables. The Prem can be estimated with acceptable accuracy using the above-mentioned approach, and pHNaF not only substitutes for clay content as a predictor variable but also confers more accuracy to the Prem estimates.

关键词： anionic adsorption pHNaF pedotransfer functions tropical soils

Skew Braces of Size p^(2)q I:Abelian Type

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Algebra Colloquium 2022年第2期29卷 297-320页

作者： e.Acri m.Bonatto ImAS-CONICeT and Universidad de Buenos Aires Pabellon 1 Ciudad Universitaria1428Buenos AiresArgentina Dipartimento di matematica e Informatica Universita di FerraraItaly

This is the first part of a series of two *** this paper we enumerate and classify the left braces of size p^(2)q,where p and q are distinct prime numbers,by the classification of regular subgroups of the holomorph of... 详细信息

关键词： Yang-Baxter equation set-theoretical solution skew brace Hopf-Galois extension

Higher order corrections to asymptotic-de Sitter inflation

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Chinese Physics C 2017年第8期41卷 112-117页

作者： m.mohsenzadeh e.Yusofi Department of Physics Qom BranchIslamic Azad UniversityQomIran Department of Physics Ayatollah Amoli BranchIslamic Azad UniversityAmolMazandaranIrana School of Astronomy Institute for Research in Fundamental Sciences(IPM)P.O.Box 19395-5531TehranIran

Since trans-Planckian considerations can be associated with the re-definition of the initial vacuum, we investigate further the influence of trans-Planckian physics on the spectra produced by the initial quasi-de Sitter（d S） state during inflation. We use the asymptotic-d S mode to study the trans-Planckian correction of the power spectrum to the quasi-d S inflation. The obtained spectra consist of higher order corrections associated with the type of geometry and harmonic terms sensitive to the fluctuations of space-time（or gravitational waves） during *** an important result, the amplitude of the power spectrum is dependent on the choice of c, i.e. the type of spacetime in the period of inflation. Also, the results are always valid for any asymptotic d S space-time and particularly coincide with the conventional results for d S and flat space-time.

关键词： initial state trans-Planckian effects inflation

modeling the Spike Response for Adaptive Fuzzy Spiking Neurons with Application to a Fuzzy XOR

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Computer modeling in engineering & Sciences 2018年第6期115卷 295-311页

作者： A.m.e.Ramírez-mendoza CONACYT Research Fellow–State University of Nuevo León(UANL for its acronym in Spanish) Mechanical and Electrical Engineering School(FIME for its acronym in Spanish)Center for Research and Innovation in Aeronautical Engineering(CIIIA for its acronym in Spanish)Carretera a Salinas Victoria km.2.3ApodacaNuevo LeónMéxico

A spike response model(SRm)based on the spikes generator circuit(SGC)of adaptive fuzzy spiking neurons(AFSNs)is *** SRm is simulated in matlabTm *** proposed model is applied to a configuration of a fuzzy exclusive or(fuzzy XOR)operator,as an illustrative example.A description of the comparison of AFSNs with other similar methods is *** novel method of the AFSNs is used to determine the value of the weights or parameters of the fuzzy XOR,first with dynamic weights or self-tuning parameters that adapt continuously,then with fixed weights obtained after training,finally with fixed weights and a dynamic gain or self-tuning gain for a fine adjustment of amplitude.

关键词： Spike response model spikes generator circuit fuzzy XOR adaptive fuzzy spiking neuron learning algorithm fuzzy neuron self-tuning