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Dark energy in five-dimensional Brans-Dicke cosmology with dimensional reduction

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Research in Astronomy and Astrophysics 2011年第8期11卷 888-894页

作者： Ahmad rami El-Nabulsi Department of Nuclear Engineering Cheju National University South Korea College of Mathematics and Information Sciences Neijiang Normal University

We explore a 5D Brans-Dicke scalar cosmology by conjecturing that the four-dimensional Hubble parameter varies as H = εФ^s, ε ∈ R and s is some unknown power index and that the extra-dimensions compactify as the visible dimensions expand as b（t） ≈ a^x （t）, x ∈R^-. We mainly discuss the case x = - 1. For critical values of e close to unity, it was observed that the acceleration of the universe occurs at red- shift close to z = 0.8 which indicates that in our model, accelerated expansion of the universe began only recently. Several interesting points are revealed and discussed in some detail.

关键词： Brans-Dicke cosmology -- dark energy

Charged Randall-Sundrum Braneworld Type Ⅱ with Higher Order Curvature Corrections from Superstring Arguments and Dominated by Quintessence

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Communications in Theoretical Physics 2010年第5期53卷 869-881页

作者： EL-NABULSI Ahmad rami Department of Nuclear and Energy Engineering Cheju National University

We discuss a new class of RSII braneworld cosmology exhibiting accelerated expansion and dominated by quintessence. It is explicitly demonstrated that the universe expansion history （transition from inflation to deceleration epoch to acceleration and effective quintessence era） may naturally occur in such unified theory for some classes of inverse scalar potentials. Besides a decaying effective cosmological constant, the model incorporates an increasing black hole mass, an increasing Maxwellian electrical charge with cosmic time and a time-dependent brahe tension. The cosmological model exhibits several features of cosmological and astrophysical interest for both the early and late universe consistent with recent observations, in particular the ones concerned with the gravitational constants, black holes masses and charges and variation of the gauge coupling parameters with cosmic time. One interesting mark of the constructed model concerns the fact that a black hole mass surrounded by quintessence energy may increase with time even if the horizon disappears.

关键词： brane world RSII cosmology higher order curvature corrections black hole black strings effective cosmological constant Maxwellian charge quintessence accelerated expansion

Inhibition of autophagy rescues HT22 hippocampal neurons from erastin-induced ferroptosis

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Neural Regeneration Research 2023年第7期18卷 1548-1552页

作者： Nora Hanke Abdelhaq rami Institut für Experimentelle Neurobiologie(Anatomie Ⅱ) Klinikum der Johann Wolfgang von Goethe-UniversitätTheodor-Stern-Kai 760590 Frankfurt/MainGermany

Ferroptosis is a regulated form of cell death which is considered an oxidative iron-dependent *** lipid hydroperoxidase glutathione peroxidase 4 prevents the iron(Fe2+)-dependent formation of toxic lipid reactive oxygen *** emerging evidence indicates that inhibition of glutathione peroxidase 4 as a hallmark of ferroptosis in many cancer cell lines,the involvement of this biochemical pathway in neuronal death remains largely ***,we investigate,first whether the ferroptosis key players are involved in the neuronal cell death induced by *** second objective was to examine whether there is a cross talk between ferroptosis and *** third main was to address neuron response to erastin,with a special focus on ferritin and nuclear receptor coactivator 4-mediated *** test this in neurons,erastin(0.5-8μM)was applied to hippocampal HT22 neurons for 16 *** addition,cells were cultured with the autophagy inhibitor,3-methyladenin(10 mM)and/or ferroptosis inhibitors,ferrostatin 1(10-20μM)or deferoxamine(10-200μM)before exposure to *** this study,we demonstrated by immunofluorescence and western blot analysis,that erastin downregulates dramatically the expression of glutathione peroxidase 4,the sodium-independent cystine-glutamate antiporter and nuclear receptor coactivator *** protein levels of ferritin and mitochondrial ferritin in HT22 hippocampal neurons did not remarkably change following erastin *** addition,we demonstrated that not only the ferroptosis inhibitor,ferrostatin1/deferoxamine abrogated the ferroptotic cell death induced by erastin in hippocampal HT22 neurons,but also the potent autophagy inhibitor,*** conclude that(1)erastin-induced ferroptosis in hippocampal HT22 neurons,despite reduced nuclear receptor coactivator 4 levels,(2)that either nuclear receptor coactivator 4-mediated ferritinophagy does not occur or is of secondary importance in this model,(3)that ferroptos

关键词： erastin ferritin ferritinophagy ferroptosis glutathione peroxidase 4 HT22 neurons nuclear receptor coactivator 4

Scalar Tensor Cosmology With Kinetic, Gauss-Bonnet and Nonminimal Derivative Couplings and Supersymmetric Loop Corrected Potential

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Communications in Theoretical Physics 2019年第7期71卷 831-836页

作者： rami Ahmad El-Nabulsi Athens Institute for Education and Research Mathematics and Physics Divisions8 Valaoritou StreetKolonaki 10671 AthensGreece

We discuss a particular four-dimensional cosmology based on non-minimal scalar tensor theories characterized by a supersymmetric loop corrected potential and a Hubble parameter defined as a function of the scalar ***-law solutions are obtained in the FRW background giving rise to acceleratedly expanding universe characterized by a scale factor and a scalar field depending both on the non-minimal coupling parameterξ.Based on SNeIa data and on Hubble data X-ray gas mass fraction measurements,we find 0.116<ξ<0.225 which results on a universe dominated by vacuum energy.

关键词： scalar tensor cosmology Gauss-Bonnet coupling non-minimal derivative coupling vacuum energy

Wireless capsule video endoscopy:Three years of experience

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World Journal of Gastroenterology 2004年第9期10卷 1238-1239页

作者： rami Eliakim Department of Gastroenterology Rambam Medical CenterTechnion School of MedicineHaifaIsrael

AIM:To review and summerize the current literatue regarding M2A wireless capsule endoscopy. METHODS:Peer reviewed publications regarding the use of capsule endoscopy as well as our personal experience were reviewed. RESULTS:Review of the literature dearly showed that capsule endoscopy was superior to enteroscopy,small bowel follow through and computerized tomography in patients with obscure gastrointestinal bleeding,iron deficiency anemia, or suspected Crohn's *** was very sensitive for the diagnosis of small bowel tumors and for survailance of small bowel pathology in patients with Gardner syndrome or familial adenomatous polyposis *** role in celiac disease and in patients with known Crohn's disease was currently being investigated. CONCLUSION:Capsule video endoscopy is a superior and more sensitive diagnostic tool than barium follow through, enteroscopy and entero-CT in establishing the diagnosis of many small bowel pathologies.

关键词： Crohn Disease Digestive System Endoscopy Gastrointestinal Diseases Humans Telemetry Video Recording

Oscillating Flat FRW Dark Energy Dominated Cosmology from Periodic Functional Approach

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Communications in Theoretical Physics 2010年第7期54卷 16-20页

作者： EL-NABULSI Ahmad rami Department of Nuclear and Energy Engineering Cheju National University

I discuss the modification of Einstein＇s Theory of General Relativity based on a periodic functional approach. In this new approach, a corrected periodic gravitational coupling constant arises and plays the role of periodic damping term acting on the theory. It is found that it is achievable to have an oscillating universe dominated by dark energy and expanding aceeleratedly in time.

关键词： corrected gravitational coupling constant dark energy cosmological constant oscillating universe accelerated expansion

Generalized uncertainty principle from long-range kernel effects:The case of the Hawking black hole temperature

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Chinese Physics B 2023年第9期32卷 153-156页

作者： rami Ahmad El-Nabulsi Waranont Anukool Center of Excellence in Quantum Technology Faculty of EngineeringChiang Mai UniversityChiang Mai 50200Thailand Quantum-Atom Optics Laboratory and Research Center for Quantum Technology Faculty of ScienceChiang Mai UniversityChiang Mai 50200Thailand Department of Physics and Materials Science Faculty of ScienceChiang Mai UniversityChiang Mai 50200Thailand Institute of Hydrobiology Biology Centre of the Czech Academy of SciencesČeskéBudějoviceCzech Republic

We prove the existence of an analogy between spatial long-range interactions,which are of the convolution-type introduced in non-relativistic quantum mechanics,and the generalized uncertainty principle predicted from quantum gravity *** an illustration,black hole temperature effects are *** is observed that for specific choices of the moment's kernels,cold black holes may emerge in the theory.

关键词： long-range kernel effects generalized uncertainty principle

New Metrics from a Fractional Gravitational Field

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Communications in Theoretical Physics 2017年第9期67卷 309-312页

作者： rami Ahmad El-Nabulsi Athens Institute for Education and Research Mathematics and Physics Divisions

Agop et al. proved in Commun. Theor. Phys. （2008） that, a Reissner-Nordstrom type metric is obtained, if gauge gravitational field in a fractal spacetime is constructed by means of concepts of scale relativity. We prove in this short communication that similar result is obtained if gravity in D-spacetime dimensions is fractionalized by means of the Glaeske-Kilbaz Saigo fractional. Besides, non-singular gravitational fields are obtained without using extra-dimensions. We present few examples to show that these gravitational fields hold a number of motivating features in spacetime physics.

关键词： D-spacetime dimensions fractional gravitational field

An Optimal Method for High-Resolution Population Geo-Spatial Data

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Computers, Materials & Continua 2022年第11期73卷 2801-2820页

作者： rami Sameer Ahmad Al Kloub Department of Disaster Management Al-Balqa Applied UniversityPrince Al-Hussien Bin Abdullah II Academy for Civil ProtectionJordan

China' Mainland has a poor distribution of meteorological *** models’estimation accuracy for creating high-resolution surfaces of meteorological data is restricted for air temperature,and low for relative humidity and wind speed(few studies reported).This study compared the typical generalized additive model(GAM)and autoencoder-based residual neural network(hereafter,residual network for short)in terms of predicting three meteorological parameters,namely air temperature,relative humidity,and wind speed,using data from 824 monitoring stations across China’s mainland in *** performance of the two models was assessed using a 10-fold cross-validation *** air temperature models employ basic variables such as latitude,longitude,elevation,and the day of the *** relative humidity models employ air temperature and ozone concentration as covariates,while the wind speed models use wind speed coarse-resolution reanalysis data as covariates,in addition to the fundamental *** coordinates represent spatial variation,while the time index of the day captures time variation in our spatiotemporal *** comparison to GAM,the residual network considerably improved prediction accuracy:on average,the coefficient of variation(CV)R2 of the three meteorological parameters rose by 0.21,CV root-mean square(RMSE)fell by 37%,and the relative humidity model improved the *** accuracy of relative humidity models was considerably improved once the monthly index was included,demonstrating that varied amounts of temporal variables are crucial for relative humidity *** also spoke about the benefits and drawbacks of using coarse resolution reanalysis data and closest neighbor values as *** comparison to classic GAMs,this study indicates that the residual network model may considerably increase the accuracy of national high spatial(1 km)and temporal(daily)resolution meteorological *** findings have implications for high-resoluti

关键词： Machine learning remote sensing geography disaster management geo-spatial analysis