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Invariant subspaces,exact solutions and stability analysis of nonlinear water wave equations

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Journal of Ocean Engineering and Science 2020年第1期5卷 35-40页

作者： K.Hosseini M.Inc M.Shafiee M.Ilie A.Shafaroody a.yusuf M.Bayram Department of Mathematics Rasht BranchIslamic Azad UniversityRashtIran Department of Mathematics Science FacultyFirat University23119 ElazigTurkey Young Researchers and Elite Club Rasht BranchIslamic Azad UniversityRashtIran Department of Mathematics Federal University Dutse7156 JigawaNigeria Department of Computer Engineering Istanbul Gelisim UniversityIstanbulTurkey

The key purpose of the present research is to derive the exact solutions of nonlinear water wave equations(NLWWEs)in oceans through the invariant subspace scheme(ISS).In this respect,the NLWWEs which describe specific nonlinear waves are converted to a number of systems of ordinary differential equations(ODEs)such that the resulting systems can be efficiently handled by computer algebra *** an accomplishment,the performance of the well-designed ISS in extracting a group of exact solutions is formally *** the end,the stability analysis for the NLWWE is investigated through the linear stability scheme.

关键词： Nonlinear water wave equations Invariant subspace scheme Exact solutions Stability analysis.

Physical and geometrical parameters of CVBS XIV:the two nearby systems HIP 19206 and HIP 84425

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Research in Astronomy and Astrophysics 2021年第7期21卷 62-70页

作者： Mashhoor A.Al-Wardat Enas Abu-Alrob Abdallah M.Hussein Mohammad K.Mardini Ali A.Taani Hatem S.Widyan Zahraa T.Yousef Hamid M.Al-Naimiy Nihad a.yusuf Department of Applied Physics and Astronomy University of SharjahSharjahUAE Sharjah Academy for Astronomy Space Science and TechnologySharjahUAE Department of Physics Al al-Bayt UniversityMafraq25113 Jordan Key Lab of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China Physics Department Faculty of ScienceAl-Balqa Applied University19117 SaltJordan Department of Applied Physics Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia43600 UKM BangiSelangorMalaysia Department of Physics Yarmouk UniversityIrbid21163Jordan

Data release 2(DR2) from the Gaia mission was of great help in precise determination of fundamental parameters of Close Visual Binary and Multiple Systems(CVBMSs), especially masses of their components, which are crucial parameters in understanding formation and evolution of stars and galaxies. This article presents the complete set of fundamental parameters for two nearby close visual binary systems(CVBSs), which are HIP 19206 and HIP 84425. We utilised a combination of two methods;the first one is Tokovinin's dynamical method to solve the orbit of the system and to estimate orbital elements and the dynamical mass sum, and the second one is Al-Wardat's method for analysing CVBMSs to estimate the physical parameters of the individual components. The latest method employs grids of Kurucz lineblanketed plane parallel model atmospheres to build synthetic Spectral Energy Distributions(SEDs) of the individual components. Trigonometric parallax measurements given by Gaia DR2 and Hipparcos catalogues are used to analyse the two systems. The difference in these measurements yielded slight discrepancies in the fundamental parameters of the individual components, especially masses. So, a new dynamical parallax is suggested in this work based on the most convenient mass sum as given by each of the two methods. The new dynamical parallax for the system HIP 19205 of 22.97±0.95 mas coincides well with the trigonometric one reported recently(in December 2020) by Gaia EDR3 of 22.3689 ± 0.4056 mas. The positions of the components of the two systems on the evolutionary tracks and isochrones are plotted, which suggest that all components are solar-type main sequence stars. Their most probable formation and evolution scenarios are also discussed.

关键词： binaries:close binaries:visual-stars:fundamental parameters stars:individual:HIP 19206 and HIP 84425

Impact of Africa Regional Food Security Program on Nigerian Farmers： The Case of National Special Program for Food Security

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Journal of Agricultural Science and Technology 2010年第5期4卷 51-60页

作者： P. O. Agbola S. a.yusuf A. A. Adubi D. O. Awotide Osun State University Osogbo 230001 Nigeria University of lbadan lbadan 200005 Nigeria World Bank Country Office Abuja 900001 Nigeria Olabisi Onabanjo University Ago-Iwoye 120005 Nigeria

This paper examined the impact of National Special Program for Food Security （NSPFS） on the beneficiaries through a qualitative measurement of the food security status of the beneficiaries. A food insecurity index was estimated to measure the well-being of the beneficiaries as affected by the impact of the program. Beneficiaries were classified into four categories： food secure （41%）, food insecure without hunger （46%）, food insecure with moderate hunger （11%）, and food insecure with severe hunger （2%）. Perceptions of beneficiaries were measured. In conclusion, the program has had a positive impact and enhanced food security among the Nigerian beneficiaries. It is not without its short comings which include delayed and untimely disbursement of funds and lack of output markets, irrigation facilities, production inputs and adequate training on technology know-how. The default rate and number of debtors remain high among beneficiaries. Efforts should be made to correct the short comings to improve the effectiveness of the program and justify the huge financial resources that have been committed.

关键词： National special program for food security beneficiaries Nigeria.

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国际法院适用反面解释方法研究

法律方法 2018年第1期24卷 73-81页

作者：阿布杜加维·优素福丹尼尔·皮特黄炎国际法院华东政法大学科学研究院

国际法院近期就'尼加拉瓜/哥伦比亚领土争端案'和'尼加拉瓜/哥伦比亚海洋划界案'的初步反对意见做出判决,并在判决中明确提及反面解释方法。尽管常设国际法院和国际法院已在多个案例中适用反面解释方法,但有关反面解释的性质、地位等问... 详细信息

国际法院近期就'尼加拉瓜/哥伦比亚领土争端案'和'尼加拉瓜/哥伦比亚海洋划界案'的初步反对意见做出判决,并在判决中明确提及反面解释方法。尽管常设国际法院和国际法院已在多个案例中适用反面解释方法,但有关反面解释的性质、地位等问题仍有待厘清。本文将尝试分析国际司法机构适用反面解释方法的具体实践,并在此基础上探讨其重要性和价值。

关键词：反面解释

Measuring the temperature of the spin via weak measurement

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Communications in Theoretical Physics 2020年第5期72卷 92-97页

作者： yusuf Turek School of Physics and Electronic Engineering Xinjiang Normal UniversityUrumqiXinjiang 830054China

In this study,we give a new proposal to measure the temperature of the spin in a sample in a magnetic resonance force microscopy system by using postselected weak measurement,and investigating the Fisher information to estimate the precision of the *** show that in a high temperature regime the temperature of the spin can be measured via a weak measurement technique with proper postselection and our scheme is able to increase the precision of temperature estimation.

关键词： weak measurement weak value spin

Mechanistic Transformations Involving Radical and Cationic Polymerizations

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Chinese Journal of Polymer Science 2020年第3期38卷 205-212,I0004页

作者： Gorkem Yilmaz yusuf Yagci Istanbul Technical University Department of ChemistryMaslak34469 IstanbulTurkey Center of Excellence for Advanced Materials Research(CEAMR)and Department of Chemistry Faculty of ScienceKing Abdulaziz University21589 JeddahSaudi Arabia

Mechanistic transformation approach has been widely applied in polymer synthesis due to its unique feature combining structurally different polymers prepared by different polymerization *** methods for the formation of block and graft copolymers through mechanistic transformation involve almost all polymerizations ***,certain polymerization processes require extensive purification processes,which can be time-consuming and *** developments on controlled/living polymerizations involving radical and cationic mechanisms with the ability to control molecular weight and functionality led to new pathways for mechanistic *** this mini-review,we systematically discussed relevant advances in the field through three main titles namely(i)from radical to cationic mechanism,(ii)from cationic to radical mechanism,and(iii)application of specific catalyst systems for both radical and cationic polymerizations.

关键词： Transformation Radical polymerization Cationic polymerization Controlled/living polymerization Photopolymerization

Evaluation of Orbital- and Ground State Energies of Some Open- and Closed-Shell Atoms over Integer and Noninteger Slater Type Orbitals

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Chinese Journal of Chemistry 2007年第1期25卷 25-31页

作者： YAKAR, yusuf Department of Physics Faculty of Arts and Science Aksaray University Aksaray Turkey

Ab initio calculations of the orbital and the ground state energies of some open- and closed-shell atoms over Slater type orbitals with quantum numbers integer and Slater type orbitals with quantum numbers noninteger have been performed. In order to increase the efficiency of these calculations the atomic two-electron integrals were expressed in terms of incomplete beta function. Results were observed to be in good agreement with the literature.

关键词： integer and noninteger Slater type orbital ground state energy of open- and closed-shell atoms incomplete beta function.

L-Factor of Irreducible χ_1×χ_2■σ

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Chinese Annals of Mathematics,Series B 2017年第4期38卷 1019-1036页

作者： yusuf DANISMAN Basic Sciences Department University of Dammam PO BOX 1982 Dammam 31441 Kingdom of Saudi Arabia

The L-factor of irreducible x1 × x2 ×｜ σdefined by Piatetski-Shapiro is computed by using non-split Bessel functional.

关键词： Bessel model L-factor GSp(4) Regular pole

An effective-field theory study of hexagonal Ising nanowire: Thermal and magnetic properties

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Chinese Physics B 2014年第4期23卷 465-471页

作者： yusuf Kocakaplan Ersin Kantar Institute of Science Erciyes University Department of Physics Erciyes University

By means of the effective-field theory （EFT） with correlations, the thermodynamic and magnetic quantities （such as magnetization, susceptibility, internal energy, specific heat, free energy, hysteresis curves, and compensation behaviors） of the spin-l/2 hexagonal Ising nanowire （HIN） system with core/shell structure have been presented. The hysteresis curves are obtained for different values of the system parameters, in both ferromagnetic and antiferromagnetic cases. It has been shown that the system only undergoes a second-order phase transition. Moreover, from the thermal variations of the total magnetization, the five compensation types can be found under certain conditions, namely the Q-, R-, S-, P-, and N-types.

关键词： hexagonal Ising nanowire effective-field theory hysteresis curve compensation behavior