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Anisotropic stellar structures in the f(T)theory of gravity with quintessence via embedding approach

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Chinese Physics C 2021年第4期45卷 426-439页

作者： Allah Ditta Mushtaq Ahmad Ibrar Hussain g.mustafa Department of Mathematics COMSATS University IslamabadLabore CampusPakistan National University of Computer and Emerging Sciences Chiniot-Faisalabad CampusPakistan School of Electrical Engineering and Computer Science National University of Sciences and TechnologyH-12IslanpabadPakistan Department of Mathematics Shanghai UniversityShanghai 200444China

This work suggests a new model for anisotropic compact stars with quintessence in f(T)gravity by us-ing the off-diagonal tetrad and the power-law as f(T)=βT^(n),where T is the scalar torsion andβand n are real *** acquired field equations incorporating the anisotropic matter source along with the quintessence field,in f(T)gravity,are investigated by making use of the specific character of the scalar torsion T for the observed stars PSRJ1614-2230,***-3,EXO1785-248,and *** is suggested that all the stellar struc-tures under examination are advantageously independent of any central singularity and are *** graphical analysis shows that various physical features which are crucially important for the emergence of the stellar structures are conferred.

关键词： quintessence power-law model f(T)gravity anisotropic compact stars

Exploring physical features of anisotropic quark stars in Brans-Dicke theory with a massive scalar field via embedding approach

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Chinese Physics C 2022年第4期46卷 185-198页

作者： Abdelghani Errehymy g.mustafa Youssef Khedif Mohammed Daoud Laboratory of High Energy Physics and Condensed Matter(LPHEMaC) Department of PhysicsFaculty of Sciences Aïn ChockHassanⅡUniversity of CasablancaB.P.5366 MaarifCasablanca 20100Morocco Department of Physics Zhejiang Normal UniversityJinhua 321004China Department of Physics Faculty of SciencesUniversity of Ibn TofailB.P.133Kenitra 14000Morocco Abdus Salam International Centre for Theoretical Physics MiramareTrieste 34151Italy

The main aim of this study is to explore the existence and salient features of spherically symmetric relativistic quark stars in the background of massive Brans-Dicke *** exact solutions to the modified Einstein field equations are derived for specific forms of coupling and scalar field functions using the equation of state relating to the strange quark matter that stimulates the phenomenological MIT-Bag model as a free Fermi gas of *** use a well-behaved function along with the Karmarkar condition for class-one embedding as well as junction conditions to determine the unknown metric *** radii of strange compact stars viz.,PSR J1416-2230,PSR J1903+327,4U 1820-30,CenX-3,and EXO1785-248,are predicted via their observed mass for different values of the massive Brans-Dicke *** explore the influences of the mass of scalar field m_(ϕ),coupling parameter ωBD,and bag constant B on state determinants and perform several tests on the viability and stability of the constructed stellar ***,we find that our stellar system is physically viable and stable as it satisfies all the energy conditions and necessary stability criteria under the influence of a gravitational scalar field.

关键词： Brans-Dicke gravity karmarkar's condition exact solutions strange stars MIT bag EoS anisotropy

Shadows and gravitational weak lensing by the Schwarzschild black hole in the string cloud background with quintessential field

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Chinese Physics C 2022年第12期46卷 321-332页

作者： g.mustafa Farruh Atamurotov Ibrar Hussain Sanjar Shaymatov Ali Övgün Department of Physics Zhejiang Normal UniversityJinhua 321004China Inha University in Tashkent Ziyolilar 9Tashkent 100170Uzbekistan Akfa University Milliy Bog Street 264Tashkent 111221Uzbekistan National University of Uzbekistan Tashkent 100174Uzbekistan Tashkent State Technical University Tashkent 100095Uzbekistan School of Electrical Engineering and Computer Science National University of Sciences and TechnologyH-12IslamabadPakistan Samarkand State University University Avenue 15Samarkand 140104Uzbekistan Ulugh Beg Astronomical Institute Astronomicheskaya 33Tashkent 100052Uzbekistan Institute of Fundamental and Applied Research National Research University TIIAMEKori Niyoziy 39Tashkent 100000Uzbekistan Physics Department Eastern Mediterranean UniversityFamagusta99628 North Cyprus via Mersin 10Turkey

In this study,we observe that,in the presence of the string cloud parameter a and the quintessence parameterγ,with the equation of state parameter,ω_(q) = -2/3the radius of the shadow of the Schwarzschild black hole increases as compared with that in the pure Schwarzschild black hole *** existence of both quintessential dark energy and the cloud of strings increases the shadow size;hence,the strength of the gravitational field around the Schwarzschild black hole *** the data collected by the Event Horizon Telescope(EHT)collaboration for M87*and Sgr A*,we obtain upper bounds on the values of a andγ.Further,we see the effects of a andγon the rate of emission energy for the Schwarzschild black *** notice that the rate of emission energy is higher in the presence of clouds of strings and ***,we study the weak deflection angle using the gauss-Bonnet *** show the influence of a andγon the weak deflection *** notice that both a andγincrease the deflection angleα.

关键词： shadow gravitational Lensing string cloud quintessence Schwarzschild black hole

Cosmological test of dark energy parametrizations within the framework of Horava-Lifshitz gravity via baryon acoustic oscillation

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Chinese Physics C 2024年第11期48卷 203-219页

作者： Himanshu Chaudhary Shibesh Kumar Jas Pacif Ujjal Debnath Farook Rahaman g.mustafa Pacif Institute of Cosmology and Selfology(PICS) SagaraSambalpur 768224OdishaIndia Department of Applied Mathematics Delhi Technological UniversityDelhi-110042India Department of Mathematics Shyamlal CollegeUniversity of DelhiDelhi-110032India Department of Mathematics Indian Institute of Engineering Science and TechnologyShibpurHowrah-711103India Department of Mathematics Jadavpur UniversityKolkata-700032India Department of Physics Zhejiang Normal UniversityJinhua 321004China

We conduct an investigation to explore late-time cosmic acceleration through various dark energy parametrizations(Wettrich,Efstathiou,and Ma-Zhang)within the Horava-Lifshitz gravity *** an alternative to general relativity,this theory introduces anisotropic scaling at ultraviolet *** primary objective is to constrain the key cosmic parameters and baryon acoustic oscillation(BAO)scale,specifically the sound horizon(rd),by utilizing 24 uncorrelated measurements of BAOs derived from recent galaxy surveys spanning a redshift range from z=0.106 to z=***,we integrate the most recent Hubble constant measurement by Riess in 2022(denoted as R22)as an extra *** the parametrizations of Wettrich,Efstathiou,and Ma-Zhang,our analysis of BAO data yields sound horizon results of r_(d)=148.1560±2.7688 Mpc,r_(d)=148.6168±10.2469 Mpc,and r_(d)=147.9737±10.6096 Mpc,*** the R22 prior into the BAO dataset results in r_(d)=139.5806±3.8522 Mpc,r_(d)=139.728025±2.7858 Mpc,and r_(d)=139.6001±2.7441 *** outcomes highlight a distinct inconsistency between early and late observational measurements,analogous to the H_(0) tension.A notable observation is that,when we do not include the R22 prior,the outcomes for rd tend to be in agreement with Planck and SDSS *** this,we conducted a cosmography test and comparative study of each parametrization within the Lambda Cold Dark Matter *** diagnostic analyses demonstrate that all models fit seamlessly within the phantom *** dark energy parametrizations predict an equation of state parameter close ω=-1,indicating a behavior similar to that of a cosmological *** statistical analysis indicates that neither of the two models can be ruled out based on the latest observational measurements.

关键词： dark energy parametrizations Horava-Lifshitz gravity baryon acoustic oscillation

西洋蓍草提取物对糖尿病大鼠的β细胞保护活性及降糖、降脂作用(英文)

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中国天然药物 2012年第3期10卷 185-189页

作者： Khalid g.mustafa Bashir A.ganai Seema Akbar Mohamad Y.Dar Akbar Masood Department of Biochemistry Faculty of Biological SciencesUniversity of Kashmir Drug Standardisation Research Unit Regional Research Institute of Unani Medicine(CCRUM)Naseem BaghUniversity of KashmirCampus

AIM:To evaluate the therapeutic uses of Achillea millifolium in diabetic ***:Diabetes was induced bysingle intraperitoneal injection of freshly prepared solution of alloxan monohydrate(150 mg·kg.1 body weight) in Wistar rats of150.200 g body *** this study,the aqueous and methanolic extract of Achillea millifolium was studied for its hypoglycemic andhypolipidemic *** rats were divided into several groups,serving as Normal group,Diabetic Control group,Diabetictreated with glibenclamide,and extract treated *** blood serum collected from the various groups of rats was analysed for itsvarious biochemical parameters like glucose,cholesterol,triglycerides,VLDL,SgOT,SgPT and *** the 14th day of the experimentthe rats were scarified and pancreas was collected for histopathological ***:The extracts at dose levels of 250and 500 mg·kg.1 body weight showed significant(P ≤ 0.05) decrease in blood glucose level,TgL,VLDL,cholesterol,SgOT,SgPT,and ALP in diabetic *** extracts prevented the β-cells of pancreas from the cytotoxic effects of Alloxan ***:The results indicate that the extracts as mentioned above are effective in hyperglycemia and can effectively protectagainst other metabolic aberrations caused by alloxan monohydrate.

关键词： Achillea millifolium Hypoglycemic Hypolipidemic Alloxan monohydrate

Bake-Hardening Response of High Martensite Dual-Phase Steel with Different Morphologies and Volume Fractions

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Acta Metallurgica Sinica(English Letters) 2014年第2期27卷 279-289页

作者： mustafa Trkmen Sleyman gndz Department of Metallurgy Kocaeli University Hereke Vocational School Department of Manufacturing Engineering Technology FacultyKarabk University

Bake-hardening behaviour of carbon steel with different martensite morphologies and volume fraction was investigated. The specimens with fibrous and bulky martensite were prestrained in tension by 4%. After this, they were unloaded and bake hardened at 180 ℃ for 10-160 min. It was found that dual-phase steel samples which were bake hardened at 180 ℃ for 20 rain showed an increase in the yield stress （YS） and ultimate tensile stress （UTS） but a decrease in ductility. Further increase in the bake-hardening time of 80 or 160 min has reduced the YS and UTS, but increased the ductility. △σ （increase in stress due to bake hardening）, YS and UTS values are higher for the microstructure containing fibrous martensite compared to the microstructure-containing bulky martensite. It was also observed that at a given baking temperature Aa, YS and UTS increased by volume of martensite.

关键词： Dual-phase steel Bake hardening Martensitic transformation

Functional roles and clinical values of insulin-like growth factor-binding protein-5 in different types of cancers

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Chinese Journal of Cancer 2012年第6期31卷 266-280页

作者： gökçe güllü Sevgi Karabulut mustafa Akkiprik Department of Medical Biology School of MedicineDMarmara University

Insulin-like growth factor-bindin g proteins (IgFBPs) are critical regulators of the mitogenic activity of insulin-like growth factors (IgFs). IgFBP5, one of these IgFBPs, has special structural features, including a nuclear transport domain, heparin-binding motif, and IgF/extracellular matrix/acid-labile subunit-binding sites. Furthermore, IgFBP5 has several functional effects on carcinogenesis and even normal cell processes, such as cell growth, death, motility, and tissue remodeling. These biological effects are sometimes related with IgF (IgF-dependent effects) and sometimes not (IgF-independent effects). The functional role of IgFBP5 is most likely determined in a cell-type and tissue-type specific manner but also depends on cell context, especially in terms of the diversity of interacting proteins and the potential for nuclear localization. Clinical findings show that IgFBP5 has the potential to be a useful clinical biomarker for predicting response to therapy and clinical outcome of cancer patients. In this review, we summarize the functional diversity and clinical importance of IgFBP5 in different types of cancers.

关键词：胰岛素样生长因子结合蛋白临床价值组织类型癌症患者细胞外基质 IgFs 生物标志物有丝分裂

Electro-Optics and Band gap Energies of Nanosilver-Coated TiO2 Nanotubes on Titanium Metal

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Acta Metallurgica Sinica(English Letters) 2018年第2期31卷 153-163页

作者： Ugursoy Olgun mustafa gülfen Fatih Ustel Hale Arslan Department of Chemistry Faculty of Arts and Sciences Sakarya University 54187 Sakarya Turkey Department of Metallurgical and Materials Engineering Faculty of Engineering Sakarya University 54187 Sakarya Turkey

TiO2 nanotubes on Ti metal surface were prepared by the electrochemical anodization method. Then, nanosilver was deposited onto the nanotubes by the electroless dip coating and the anodization. The obtained TiO2 nanotubes were examined by using scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, cyclic voltammetry, and UV–Vis. The electrochemical band gap（Eg^CV） of the nanosilver-coated TiO2 nanotubes prepared by the anodization was found as 1.54 eV. Using the UV–Vis measurements, the optical band gap energy（Eg^op.） was calculated as 1.51 eV for the Ag/TiO2 nanotubes obtained by electroless dip coating. The electrical conductivity of the TiO2 nanotubes also increased from 3.0 × 10^-4 to 34.7 S/cm after nano Ag deposition by the anodization *** Ag/TiO2 nanotubes with low band gap and high electrical conductivity are desirable for the applications in electronics, Li-ion batteries, and solar cells.

关键词： Electrochemical anodization TiO2 nanotubes Nano Ag deposition Band gap energy Electrical conductivity

Simultaneous Determination of Amoxicillin, Lansoprazole, and Levofloxacin in Pharmaceuticals by HPLC with UV-Vis Detector

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Journal of Analysis and Testing 2020年第1期4卷 45-53页

作者： mustafa gülfen YazgiCanbaz AbdilÖzdemir Department of Chemistry Faculty of Arts and SciencesSakarya University54187 SakaryaTurkey

In this study,a specific and rapid high-performance liquid chromatography(HPLC)method has been developed and validated for the simultaneous determination of amoxicillin,lansoprazole,and levofloxacin in *** was used as internal standard(IS)in the ***-Vis absorption spectra of the analytes and the IS were taken for the determination of suitable absorption wavelength of UV-Vis detector(diode array detector,DAD)in the HPLC instrument.A reverse-phase C18 column was used in the separation and determination of amoxicillin,lansoprazole,and levofloxacin together with the *** pharmaceutical analytes were quantified by the UV-Vis diode array detector in the HPLC using MeOH-0.01 M CH_(3)COONH_(4)(70:30)as the mobile *** linear calibration curves of them were measured in the ranges of 15-40 mg/L,2.5-15.0 mg/L,and 7.5-20.0 mg/L for amoxicillin,lansoprazole,and levofloxacin,*** calibration correlations(R^(2):0.9942,0.9997,and 0.9974)were *** percentage recoveries of the amoxicillin,lan-soprazole,and levofloxacin in commercial pharmaceuticals were obtained as 105.5%,98.57%,and 102.5%,*** results showed that amoxicillin,lansoprazole,and levofloxacin together with paracetamol IS could be separated and determined simultaneously with low LOD and LOQ values using the proposed HPLC method.

关键词： HPLC Amoxicillin Levofloxacin Lansoprazole Simultaneous determination