Browsing Mathematics, Statistics & Physics by Title

Now showing items 344-363 of 687

    • Investigation of optical and electrical properties of Cobalt-doped Ge-Sb-S thin film 

      Musa I.; Qamhieh Z.; Mahmoud S.; El-Shaer M.; Ayesh A.; ... more authors ( Elsevier B.V. , 2019 , Article)
      Amorphous Germanium Antimony Sulphide (Ge-Sb-S) doped with Cobalt (Co) have been deposited on glass substrates by thermal evaporation technique on a glass substrate. The films deposited onto glass substrates are characterized ...

    • Investigation of phase transformation for ferrite-austenite structure in stainless steel thin films 

      Merakeb, Noureddine; Messai, Amel; Ayesh, Ahmad I. ( Elsevier B.V. , 2016 , Article)
      In this work we report on phase transformation of 304 stainless steel thin films due to heat treatment. Ex-situ annealing was applied for evaporated 304 stainless steel thin films inside an ultra-high vacuum chamber with ...

    • Investigation of Proton Diffusion Coefficient for PbO2 Prepared from Intermediate Oxides 

      Rahmani, L.; Fitas, R.; Messai, A.; Ayesh, A.I. ( Pleiades Publishing , 2019 , Article)
      Lead dioxide was extracted from used batteries, and used to synthesize the following intermediate oxides by heating at different temperatures: Pb12O19, Pb12O17, and Pb3O4. Each of the prepared intermediate oxide was subject ...

    • Investigation on inlet obstruction in transitional flow regime: Heat transfer augmentation and pressure drop analysis 

      Basma, Souayeh; Bhattacharyya, Suvanjan; Hdhiri, Najib; Alam, Mir Waqas; Yasin, Essam; ... more authors ( Elsevier , 2022 , Article)
      Thermohydraulic characteristics of air as the working medium in a circular heated channel fitted with inlet obstruction (ribbed prism) at the inlet is carried out experimentally for transitional flow regime. The ribbed ...

    • Investigations of He <sup>+</sup> implantation and subsequent annealing effects in InP 

      Al-Qaradawi, I. Y. ( Elsevier , 2006 , Article)
      The influence of 70 keV He + ion implantation and subsequent annealing of Cz-indium phosphide (InP) samples has been investigated using a slow positron beam-based Doppler broadening spectrometer. Three samples with ion ...

    • Ion beam modification of surface properties of polyethylene 

      Andrzej, Turos; Jagielski, Jacek; Piątkowska, Anna; Bieliński, Dariusz; Ślusarski, Ludomir; ... more authors ( Elsevier , 2003 , Conference Paper)
      Improvement of polymer tribological properties is an essential issue for their application when used as parts of machines or artificial human joints. Ion implantation is a very promising technique in this respect. This ...

    • Ion impact induced ionization/fragmentation dynamics of rare gas Dimers 

      Kim, H. K.; Titze, J.; Schöffler, M.; Trinter, F.; Waitz, M.; ... more authors ( IOP Publishing , 2013 , Conference Paper)
      We have measured the ionization and fragmentation of Helium, Neon and Argon Dimers induced by ion impact and observed two different pathways, the sequential ionization on each atom and the interatomic Cou-lombic decay. © ...

    • Ion-impact-induced interatomic Coulombic decay in neon and argon dimers 

      Kim, H. K.; Gassert, H.; Schöffler, M. S.; Titze, J. N.; Waitz, M.; ... more authors ( American Physical Society , 2013 , Article)
      We investigate the contribution of interatomic Coulombic decay induced by ion impact in neon and argon dimers (Ne2 and Ar2) to the production of low-energy electrons. Our experiments cover a broad range of perturbation ...

    • Is hypertension a predictor for heart failure? A cross cultural comparison over a 10-year period 

      Bener, A.; Al Suwaidi, J.; Ghaffar, A. ( Elsevier B.V. , 2005 , Article)
      This was a retrospective cohort study to assess the effect of hypertension (HTN) among Qatari and Asian patients admitted to the Hamad General Hospital in Qatar with heart failure (HF) and to identify risk factors that ...

    • Isomorphic Hilbert spaces associated with different complex contours of the PT-symmetric (-x^4) theory 

      Shalaby, Abouzeid M. ( World Scientific Publishing Co. , 2014 , Article)
      In this work, we stress the existence of isomorphisms which map complex contours from the upper half to contours in the lower half of the complex plane. The metric operator is found to depend on the chosen contour but the ...

    • Isoperimetric properties of condenser capacity 

      Mohamed M.S., Nasser; Vuorinen, Matti ( Elsevier , 2021 , Article)
      For compact subsets E of the unit disk D we study the capacity of the condenser (D,E) by means of set functionals defined in terms of hyperbolic geometry. In particular, we study experimentally the case of a hyperbolic ...

    • Iterative approximation of common attractive points of further generalized hybrid mappings 

      KhanS.H. ( SpringerInternationalPublishing , 2018 , Article)
      Our purpose in this paper is (i) to introduce the concept of further generalized hybrid mappings, (ii) to introduce the concept of common attractive points (CAP), and (iii) to write and use Picard-Mann iterative process ...

    • Iterative scheme for an elliptic non-local free boundary problem 

      Barkhudaryan, R.; Juráš, M.; SalehiM. ( Taylor & Francis , 2016 , Article)
      In this paper we treat a non-local free boundary problem arising in financial bubbles, where the model is set in the framework of viscosity solutions. We suggest an iterative scheme which consists of a sequence of obstacle ...

    • Joint spatial time-series epidemiological analysis of malaria and cutaneous leishmaniasis infection 

      ADEGBOYE, O. A.; AL-SAGHIR, M.; LEUNG, D. H. Y. ( Cambridge University Press , 2017 , Article)
      Malaria and leishmaniasis are among the two most important health problems of many developing countries especially in the Middle East and North Africa. It is common for vector-borne infectious diseases to have similar ...

    • K-shell photoionization of O+ and O2+ ions: Experiment and theory 

      Bizau, J.M.; Cubaynes, D.; Guilbaud, S.; Al-Shorman, M. M.; Gharaibeh, M. F.; ... more authors ( American Physical Society , 2015 , Article)
      Absolute cross sections for the single and double K-shell photoionization of carbon like O2+ and nitrogen like O+ ions were measured in the 526–620-eV photon energy range by employing the ion-photon merged-beam technique ...

    • Koopman Operator Approximation Under Negative Imaginary Constraints 

      Mabrok, Mohamed A.; Aksikas, Ilyasse; Meskin, Nader ( Institute of Electrical and Electronics Engineers Inc. , 2023 , Article)
      Nonlinear Negative Imaginary (NI) systems arise in various engineering applications, such as controlling flexible structures and air vehicles. However, unlike linear NI systems, their theory is not well-developed. In this ...

    • Large sample and bootstrap intervals for the gamma scale parameter based on grouped data 

      Baklizi, Ayman; Al-Nasser, Amjad ( Wayne State University , 2006 , Article)
      Interval estimation of the scale parameter of the gamma distribution using grouped data is considered in this article. Exact intervals do not exist and approximate intervals are needed Recently, Chen and Mi (2001) proposed ...

    • Large-scale global optimization based on hybrid swarm intelligence algorithm 

      Mashwani, W.K.; Hamdi, A.; Asif Jan, M.; Goktas, A.; Khan, F. ( IOS Press , 2020 , Article)
      There are numerous large-scale global optimization problems encountered in real-world applications including engineering, manufacturing, economics, networking fields. Over the last two decades different varieties of swarm ...

    • Large-Scale Swarm Control in Cluttered Environments 

      Elsayed, Saber; Mabrok, Mohamed ( Springer Science and Business Media Deutschland GmbH‏ , 2024 , Conference Paper)
      In the evolving era of social robots, managing a swarm of autonomous agents to perform particular tasks has become essential for numerous industries. The task becomes more challenging for large-scale swarms and complex ...

    • Least-squares spectral methods for ODE eigenvalue problems 

      Hashemi, Behnam; Nakatsukasa, Yuji ( Society for Industrial and Applied Mathematics , 2022 , Article)
      We develop spectral methods for ODEs and operator eigenvalue problems that are based on a least-squares formulation of the problem. The key tool is a method for rectangular generalized eigenvalue problems, which we extend ...