Department of Physics

Permanent URI for this collection

Browse

Recent Submissions

Now showing 1 - 5 of 5
  • Item
    UNDERSTANDING THE DIVERSITY AMONG HUMAN URINES USING AN ARTIFICIAL URINE SYSTEM AND FTIR SPECTROSCOPY
    ( 2023-02-07) AHMED, Mariam Hany Farouk Mohamed ; KORKMAZ ÖZKAN, Filiz
    Urine tests are a common and convenient way to identify and diagnose a variety of disorders. In this study, we employ a novel artificial urine protocol (MP-AU) to determine the spectra of the normal minimum and maximum values of 9 urine components within the normal physiological range. Fourier Transform Infrared (FTIR) spectroscopy is employed to generate these spectra, which will aid in the early detection of disorders, if any exists. The spectrum obtained from the patient's urine sample would be compared to the spectra obtained from artificial urine solutions for the minimum and maximum normal values. The outcome of this comparison will be related to the patient's health. If the patient's spectrum lies between these two normal spectra, the patient can be considered healthy. Correspondingly, if the patient's spectrum falls outside of the normal range, more tests can be ordered to detect the anomaly. The findings of this study reveal that the quantity of components within the artificial urine system is correlated with the amplitudes of the peaks in the FTIR spectra. Furthermore, characteristic peak positions of the tested urine components are identified, which can be used as a reference in further studies. This study was financially supported by Atilim University Research Support program, Grant number ATU-ADP-2122-01.
  • Item
    ELECTRON TRANSPORT THROUGH ONE–DIMENSIONAL QUANTUM SYSTEMS
    ( 2022-02-28) Algadi, Latifa ; Oymak, Hüseyin
    We study the quantum transport of an electron through some one-dimensional (1D) quantum systems (or seemingly 2D systems which are practically reducible to 1D systems) coupled to two ideal leads. After reviewing the rudiments of electricity phe nomena, leading to the concept of current, and some magnetism phenomena in terms of classical mechanics, we provide the basic formalism of quantum mechanics by elucidating its working machinery in terms of Dirac notation. We next deal with 1D scattering problems and study in detail some examples containing delta-function po tentials. We then focus on the so-called two-state quantum systems, like the am monia molecule, the hydrogen molecular ion, and the hydrogen molecule. Later on we investigate the propagation of an electron in a 1D crystal lattice with all of its fine details. After settling down the rudiments of 1D finite linear atomic-chain and atomic-ring structures, we come to the subject of resonant transport that we investi gate through some illustrative problems. We then present the mathematics and physics of the Aharonov-Bohm (AB) rings, for which we touch the classical Lagrangian and Hamiltonian dynamics for a charged particle moving in an electromagnetic field and the relevant gauge transformations. Finally, for obtaining transport properties of 1D quantum systems, we demonstrate how to use a pruning technique, called Ricattiratios method, which changes the time-independent discrete Schrodinger ¨ equation into a two-point recursive equation. We test the method in some 1D well-known systems as well as in single and double AB rings by simply reducing them to one dimension with the help of a decimation method.
  • Item
    STRUCTURAL AND ELLIPSOMETRIC PROPERTIES OF GaS(x)Se(1-x) LAYERED MIXED CRYSTALS
    ( 2022-02-28) Habaibi, Om-Alhana ; Işık, Mehmet ; Korkmaz Özkan, Filiz
    GaSxSe1-x layered mixed crystals were investigated using structural and optical characterization techniques. Structural characterization of samples grown by Bridgman method were accomplished using x-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and fourier transform infrared (FTIR) spectroscopy techniques. Compositional dependence of mixed crystals were obtained from EDS experiments. Results of measurement indicated that used samples correspond to composition of x varying from 0 to 1 by 0.25 intervals. The crystal structures of the samples were revealed using the results of XRD measurements and a software program for analyses. FTIR spectra of the samples indicated the presence of multiphonon absorptions in the samples for compositions of x = 0, 0.25 and 0.50. The results of XRD and FTIR experiments were associated between the used compositions. Optical characterization of the samples were achieved by ellipsometry experiments carried out in the spectral range of 1.2-6.0 eV. The output data of measurement system were converted to data presenting the spectral dependency of optical parameters. Ellipsometric data was used to obtain the band gap energy of the samples. Obtained band gap energy values showed that as sulfur composition is increased in the mixed crystals, band gap energy increases from 2.04 eV (x = 0) to 2.57 eV (x = 1). According to revealed band gap energy values, a graph presenting the compositional dependence of bang gap energy was plotted.
  • Item
    ANALYSES OF SPECTROSCOPIC PARAMETERS OF GROUND STATE AND FIRST ORBITALLY EXCITED STATE HEAVY BARYON SIGMA(Q) WITHIN QUANTUM CHROMODYNAMICS SUM RULES
    ( 2022-02-14) Alsafi, Haneen ; Saraç Oymak, Yasemin
    In this work, we investigate the spectroscopic properties, such as masses and residues, of the ground state ~Q baryons having spin-~ and their first orbital excitation (lP) states. In the calculations we use the QCD sum rule method, which is among the successful nonperturbative approaches. The obtained results are compared with the existing experimental ones and present theoretical predictions, as well. The mass cal culations of these baryons provide us with important insights into not only understand ing the nature and substructure of these baryons but also gaining better understanding on the strong interaction.
  • Item
    GROWTH AND CHARACTERIZATION OF MoO THIN FILMS
    ( 2022-01-21) Al-Noor, Karrar Noor Hussein ; Güllü, Hasan Hüseyin
    In this thesis, the experimental work was focused on growth and characterization of MoO thin films. Therefore, thin film samples in the compositional stoichiometry were deposited using DC magnetron sputtering method. Two sets of samples depending on their sputtering times were obtained. Keeping DC power at 100 W that allows to get a fixed deposition ratio, timing was arranged as 30 and 60 minutes. In addition, the effects of substrate temperature were investigated. For each set, four different samples due to their substrate temperatures, in between the room temperature and 300°C, during the sputtering process were prepared. Thus, structural, surface, optical and electrical characteristics of these samples depending on deposition time and the variation in substrate temperature were evaluated.