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Distribution Of Circles On A Circle And Correlation Between Vortex Rings Of Superfluids, Mehmet Onur Fen, Şaki̇r Erkoç Jan 2007

Distribution Of Circles On A Circle And Correlation Between Vortex Rings Of Superfluids, Mehmet Onur Fen, Şaki̇r Erkoç

Turkish Journal of Physics

Superfluids are characterized by absence of viscosity. When superfluids are rotated, differently from normal fluids, they form more than one vortex in the containers where they are placed. The number of vortices change as the rotation velocity changes, but this change is not linear. M.W. Zwierlein et al. observed the vortices in experiments, observing up to a number of 80. Experiments also showed that the vortex distributions cannot include large spaces. By using experimental data, we noticed that when we think of vortices as vortex rings, their centers are at the same geometric location and these geometric locations are concentric …

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Role Of Sn In The Density Of Defect States In A-Se_{0.75}Te_{0.25} And A-Se_{0.85}Te_{0.15}Thin Films, N. Sharma, Santosh Kumar Jan 2007

Role Of Sn In The Density Of Defect States In A-Se_{0.75}Te_{0.25} And A-Se_{0.85}Te_{0.15}Thin Films, N. Sharma, Santosh Kumar

Turkish Journal of Physics

In this paper we report the effect of Sn incorporation in the density of defect states of two binary Se-Te glassy systems, comparing the properties of a-Se_{0.75}Te_{0.25}, a-Se_{0.85}Te_{0.15} and a-Se_{0.75}Te_{0.15}Sn_{0.10} glassy alloys. Properties of d.c. conductivity at high electric fields in vacuum were examined; and current-voltage (I-V) characteristics have been measured at various fixed temperatures. Ohmic behavior is observed at low electric fields; while at high electric fields (E \sim 10^4 V/cm), non-ohmic behavior is observed. An analysis of the experimental data confirms the presence of space charge limited conduction (SCLC) in the studied glassy materials. Density of defect states …

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Effects Of The Left-Right Asymmetry Parameter In The End Point Of The Tritium-Beta Spectrum, A. Gutierrez-Rodriguez, M. A. Hernandez-Ruiz, F. Ramirez-Sanchez Jan 2007

Effects Of The Left-Right Asymmetry Parameter In The End Point Of The Tritium-Beta Spectrum, A. Gutierrez-Rodriguez, M. A. Hernandez-Ruiz, F. Ramirez-Sanchez

Turkish Journal of Physics

We start with a Left-Right Symmetric Model and we analyze the endpoint of the beta decay of tritium ^3H \rightarrow ^3He + e- + bar{\nu}_e. We applied this model to incorporate the right currents, whereby we propose an amplitude whose leptonic part contains the parameter \lambda defined as a left-right asymmetry parameter which measures the parity violation. We realized a numerical computation for the sensibility of the Mainz and Troitsk experiments for m_{\nu_e}= 2.2 eV; and for the future beta decay experiment KATRIN, which will reach a sensitivity of m_{\nu_e} \approx 0.2 eV. We find that the electron energy spectrum …

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Algebraic Treatment Of Scattering Via The Manning-Rosen Potential Related To The So(2, 1) Group, Nurşen Seçki̇n Görgün, Fi̇kret Işik Jan 2007

Algebraic Treatment Of Scattering Via The Manning-Rosen Potential Related To The So(2, 1) Group, Nurşen Seçki̇n Görgün, Fi̇kret Işik

Turkish Journal of Physics

In this study, we consider SO(2,1) \supset SO(1,1) subgroup reduction from one dimensional scattering systems related to SO(2,1). As an analytical application, we show via algebraic approach the Manning-Rosen potential belongs to the class of potentials corresponding to the reduction SO(2,1) \supset SO(1,1). The wave function and the scattering matrix of the system with this potential were determined.

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Time Dependent Entropy Of Constant Force Motion, Özgür Özcan, Ethem Aktürk, Ramazan Sever Jan 2007

Time Dependent Entropy Of Constant Force Motion, Özgür Özcan, Ethem Aktürk, Ramazan Sever

Turkish Journal of Physics

Time dependent entropy of constant force motion is investigated. Obtained is the joint entropy, also known as the Leipnik entropy. The main purpose of this work is to calculate the Leipnik entropy via a time dependent wave function which is obtained by the Feynman path integral method. For this case it is found the Leipnik entropy increases with time, and is the same behavior as in the free particle case.

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Green Function Of The Morse Potential Using Perturbation Series, B. Boudjedaa, M. T. Meftah, Lyazid Chetouani Jan 2007

Green Function Of The Morse Potential Using Perturbation Series, B. Boudjedaa, M. T. Meftah, Lyazid Chetouani

Turkish Journal of Physics

We find the Green function of the Schrodinger equation for the Morse potential using perturbation series. By Fourier transformation on the end point of the perturbation series, and with some formulas for terms generating the perturbation series, we are able to derive the Green function of the problem.

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Optical Properties And Structural Characterizations Of Sb_2s_3 Thin Films Deposited By Chemical Bath Deposition Technique, F. I. Ezema, A. B. C. Ekwealor, P. U. Asogwa, P. E. Ugwuoke, C. Chigbo, R. U. Osuji Jan 2007

Optical Properties And Structural Characterizations Of Sb_2s_3 Thin Films Deposited By Chemical Bath Deposition Technique, F. I. Ezema, A. B. C. Ekwealor, P. U. Asogwa, P. E. Ugwuoke, C. Chigbo, R. U. Osuji

Turkish Journal of Physics

Thin films of Sb_2S_3 were deposited on glass substrates at 300 K by chemical bath deposition (CBD) technique and annealed at various temperatures. The absorption coefficient \alpha was determined using the absorbance and transmission measurements from a Unico UV-2102 PC spectrophotometer, at normal incidence of light in the wavelength range 200--1000 nm, and the structural characterization were done using XRD and photomicrograph. The films have high absorption, greater than 90%, in the UV region but with moderate transmittance of greater than 50% for as-deposited, and poor transmittance of less than 45% for the annealed throughout the entire spectrum. Plots of …

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A Single Junction Barrier Model For Varistors, Mustapha Tioursi, Abdallah Chaouch Jan 2007

A Single Junction Barrier Model For Varistors, Mustapha Tioursi, Abdallah Chaouch

Turkish Journal of Physics

In this paper, we propose a simplified model that explains the experimental behaviour of the single junction barrier height in varistors. The equation obtained for the barrier height variation versus voltage contains all parameters that characterize the grain boundary and has no adjustable parameters. It allows us to describe the equilibrium state for each voltage level. From this model, it is concluded that the threshold voltage and the nonlinearity coefficient for a single junction barrier are strongly related to the unoccupied traps level at zero bias, when the barrier height at zero bias and the leakage current are related to …

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Application Of Pma Towards Moderating The Charge Storage Capability Of Mis Memory Cell Based On Pecvd Deposited Silicon Nitride Thin Films, Satinder K. Sharma, B. Prasad, Dinesh Kumar Jan 2007

Application Of Pma Towards Moderating The Charge Storage Capability Of Mis Memory Cell Based On Pecvd Deposited Silicon Nitride Thin Films, Satinder K. Sharma, B. Prasad, Dinesh Kumar

Turkish Journal of Physics

A memory capacitor formed from Al/Si_3N_4/Si was prepared by means of trapping and de trapping mechanism of the dielectric films. Charge trapping and interface state characteristics of silicon nitride (Si_3N_4) films deposited by standard plasma enhanced chemical vapor deposition technique were investigated. High frequency capacitance-voltage (C-V), conductance-voltage (G-V) and current voltage (I-V) measurements were carried out at various temperatures on metal-oxide-semiconductor capacitors, for as-deposited samples, post metallization annealed (PMA) at 400 °C and 600 °C samples. The electrically measured characteristics indicate the shift in flat band voltage V_FB in silicon nitride (Si_3N_4) was initially much higher in the as-deposited samples. …

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The Origin Of X-Ray Emission Lines From Ss Cgy, Romanus N. C. Eze Jan 2007

The Origin Of X-Ray Emission Lines From Ss Cgy, Romanus N. C. Eze

Turkish Journal of Physics

SS Cyg is a dwarf nova binary star that undergoes frequent large amplitude outburst within a period of 40 days. SS Cyg was observed with the Chandra x-ray telescope in quiescence on 2000 August 24, and near the peak and early decline of a narrow outburst on 2000 September 12 and 14 (exposures of 47 and 96 ks). The spectrum of the source shows strong emission lines of O VII and O VIII in all three observations. These lines, we note, originate from the boundary layer.

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Study Of Vickers´ Micro Hardness On Inbi_0.85sb_0.15 Single Crystals, Dimple Shah, G. R. Pandya, S. M. Vyas, M. P. Jani Jan 2007

Study Of Vickers´ Micro Hardness On Inbi_0.85sb_0.15 Single Crystals, Dimple Shah, G. R. Pandya, S. M. Vyas, M. P. Jani

Turkish Journal of Physics

InBi_0.85Sb_0.15 single crystals have been grown by zone-melting method. The growth velocity was 0.8 cm/h and the freezing interface temperature was 35 °C/cm. A Vickers' projection microscope was used for the study of micro hardness of the crystals. Hardness tests were carried out on the as-cleaved, cold-worked and annealed surfaces of the crystals. The effect of perfection of crystals on micro hardness with respect to the cold-worked, as-cleaved and annealed crystals have been studied and the results are reported.

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Variational Ground State Approach For A Tunnelling Exciton Coupled To Phonons, Dezider Kulak Jan 2007

Variational Ground State Approach For A Tunnelling Exciton Coupled To Phonons, Dezider Kulak

Turkish Journal of Physics

In this paper a variational study of a tunnelling exciton (Frenkel exciton) coupled to an arbitrary number of phonon modes is presented. The results of our model are presented both for weak non-adiabatic cases and for strong cases; and we come to the conclusion that the tunnelling reduction factor, the ground state energy of the tunnelling exciton-phonons system, and the mean number of ground state phonons, as the functions of the exciton-phonons coupling strength, are continuous, a condition that does not apply in cases of the tunnelling exciton-phonons models presented in the previous studies. In comparison with the previous studies, …

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Longitudinal Form Factor Of Isoscalar Particle-Hole States In ^{16}O, ^{12}C And ^{40}Ca With M3y Interaction, Ali H. Taqi, Raad A. Radhi Jan 2007

Longitudinal Form Factor Of Isoscalar Particle-Hole States In ^{16}O, ^{12}C And ^{40}Ca With M3y Interaction, Ali H. Taqi, Raad A. Radhi

Turkish Journal of Physics

Longitudinal form factors of the low-lying, T = 0, particle-hole states of ^{16}O, ^{12}C and ^{40}Ca are studied in the framework of Random Phase Approximation RPA. The basis of single particle states is considered to include 0s, 0p, 1s-0d and 0f-1p. The Hamiltonion is diagonalized in the presence of Michigan three-rang Yakawa (M3Y) interaction and compared with our previous results depend on Modified Surface Delta Interaction MSDI interaction. Admixture of higher configuration up to 2p-1f is considered for the ground state. Effective charges are used to account for the core polarization effect. Comparisons are made to experimental data where available …

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Photovoltaic Properties Of N-(Zns)_X(Cdte)_{1-X}/P-Si, S. K. J. Al-Ani, A. Kh. Ba-Yashoot, M. N. Makadsi, A. M. Al-Sharbaty Jan 2007

Photovoltaic Properties Of N-(Zns)_X(Cdte)_{1-X}/P-Si, S. K. J. Al-Ani, A. Kh. Ba-Yashoot, M. N. Makadsi, A. M. Al-Sharbaty

Turkish Journal of Physics

Hetrojunction solar cells n-(ZnS)_{x}(CdTe)_{1-x}/p-Si, with Al, In and Au as front grid contacts, have been fabricated by thermal evaporation technique. Their photovoltaic properties and the forward I-V characteristics of the annealed cells at 400 °C were studied. The efficiency, ideality factor and other parameters have been obtained. The results showed that the efficiency, as well as the ideality factor, depends on the ZnS content in the cell and the efficiency is high for Au front contact compared with that of Al and In.

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Opto-Electrical Properties Of Copper-Indium-Selenium Thin Films, S. F. Shaukat, S. A. Khan, Robina Farooq Jan 2007

Opto-Electrical Properties Of Copper-Indium-Selenium Thin Films, S. F. Shaukat, S. A. Khan, Robina Farooq

Turkish Journal of Physics

Copper-Indium-Selenium (CIS) thin films have been characterised using various experimental techniques. These compounds are extensively used in solar cell technology as absorber layers due to their exciting characteristics. Optical transmission measurements on different compositions of CIS films are observed and the absorption coefficient is determined. The Van der Pauw technique is used to divulge the electrical characteristics of these films. The electrical conductivity is found relatively high for the films annealed in vacuum but decreases for films synthesised optimally. It is observed that p-type films have higher conductivity than n-type films. The grain size, composition, structure and the spacing of …

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Magnetic Levitation Of A Small Magnetic Ring Above Cylindrical Superconductor Sample In The Meissner State, H. M. Al-Khateeb, F. Y. Alzoubi, M. K. Alqadi, N. Y. Ayoub Jan 2007

Magnetic Levitation Of A Small Magnetic Ring Above Cylindrical Superconductor Sample In The Meissner State, H. M. Al-Khateeb, F. Y. Alzoubi, M. K. Alqadi, N. Y. Ayoub

Turkish Journal of Physics

The levitation force between a cylindrical superconductor in the Meissner state and a small magnetic ring was calculated using the dipole-dipole interaction model under the assumption that the magnetic ring is small compared with the physical dimensions of the system. We obtained analytical expressions for the levitation forces as a function of the geometrical parameters of the ring and the superconductor sample as well as the height of magnetic ring. We analyzed the levitation force in two configurations of the magnetic moment of the small ring with respect to the surface of the superconductor: one horizontal in which the magnetic …

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Thickness Dependent Structural, Electrical And Optical Properties Of Chemically Deposited Nanopartical Pbs Thin Films, A. U. Ubale, A. R. Junghare, N. A. Wadibhasme, A. S. Daryapurkar, R. B. Mankar, V. S. Sangawar Jan 2007

Thickness Dependent Structural, Electrical And Optical Properties Of Chemically Deposited Nanopartical Pbs Thin Films, A. U. Ubale, A. R. Junghare, N. A. Wadibhasme, A. S. Daryapurkar, R. B. Mankar, V. S. Sangawar

Turkish Journal of Physics

Nanostructured thin films have attracted the attention of an increasing number of researchers from several disciplines during the last ten years, due to their outstanding electronic and optical properties and extensively useful applications in various optoelectronic devices. PbS thin films were deposited onto glass substrate by the method of chemical bath deposition (CBD) at 330 K temperature. The structure and surface morphology of the films were characterized by X-ray diffraction and scanning electron microscopy. The optical investigation showed that, depending on thickness films have direct allowed transitions in the range 1.88-2.28 eV. The decrease in dc dark resistivity with increase …

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Preparation And Study Of The Structural, Optical And Electrical Properties Of Cu(In,Ga)Se_2 Thin Films, Athar Javed Jan 2007

Preparation And Study Of The Structural, Optical And Electrical Properties Of Cu(In,Ga)Se_2 Thin Films, Athar Javed

Turkish Journal of Physics

Thin film samples of Cu(In,Ga)Se_2 (CIGS) were prepared at room temperature by physical vapor deposition (PVD) technique using resistive heating method onto soda lime glass substrates. Deposition conditions were same for all the samples. The prepared samples were annealed in vacuum at temperature of 200 °C for 5, 10, 15, 30 and 60 minutes and were characterized structurally, optically and electrically. The structural analysis indicate the partial formation of quaternary CIGS compounds for the samples which were annealed in vacuum at 200 °C for 30 and 60 minutes. XRD analysis indicate that there is a continuous growth and improvement in …

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Silver Mode For Heavy Higgs Search In The Presence Of A Fourth Sm Family, Saleh Sultansoy, Gökhan Ünel Jan 2007

Silver Mode For Heavy Higgs Search In The Presence Of A Fourth Sm Family, Saleh Sultansoy, Gökhan Ünel

Turkish Journal of Physics

We investigate the possible enhancement to the discovery of the heavy Higgs boson through the possible fourth standard model family heavy neutrino. Using the channel h\to\nu_4\bar{\nu}_4 \to \mu W\mu W \to \mu j j\mu j j it is found that for certain ranges of the Higgs boson and \nu_4 masses, LHC could discover both of them simultaneously with 1fb^{-1} integrated luminosity.

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Five Dimensional Anisotropic Homogeneous Cosmological Models In Second Self Creation Theory Of Gravitation, Ganeshwar Mohanty, Kamal Lochan Mahanta Jan 2007

Five Dimensional Anisotropic Homogeneous Cosmological Models In Second Self Creation Theory Of Gravitation, Ganeshwar Mohanty, Kamal Lochan Mahanta

Turkish Journal of Physics

Five dimensional homogeneous anisotropic cosmological models in Barber's second self creation theory are constructed when the gravitational field is generated by a perfect fluid. Under the power law dependence of the scale factors, the perfect fluid models degenerate Zeldovich fluid models. The physical and geometrical features of these models are discussed.

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On The Eigensolutions Of The One-Dimensional Kemmer Oscillator, A. Boumali Jan 2007

On The Eigensolutions Of The One-Dimensional Kemmer Oscillator, A. Boumali

Turkish Journal of Physics

In the present paper, we solve the one-dimensional Kemmer equation in the presence of the Dirac oscillator potential. Following Greiner in [23], we have shown that the eigensolutions are decoupled in two sets.

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An Investigation Of The Effects Of Hydrogen On Local Strain Fields And Structural Disorder-To-Order Transition In Hydrogenated Amorphous Silicon, Aniekan Magnus Ukpong Jan 2007

An Investigation Of The Effects Of Hydrogen On Local Strain Fields And Structural Disorder-To-Order Transition In Hydrogenated Amorphous Silicon, Aniekan Magnus Ukpong

Turkish Journal of Physics

This study utilizes the fluctuations in the mean silicon-silicon near neighbour distances and local atomic-level stresses to study the chemically-induced disorder-to-order transition in hydrogenated amorphous silicon as a function of hydrogen concentration C_H. The correlation between a suitable stress and structure parameter shows a three-stage structure transition that culminates in the formation of a crystalline phase at high C_H. In the low C_H limit, the structural changes are characterized by a linear response to stress giving a rigidity modulus of 73.43+-15 GPa. In the intermediate and high C_H limits, the stress-structure correlation shows a volume-dependence. At very high hydrogen concentrations, …

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Optical Properties And Determination Of Thermal Transformation Parameters For Se_{0.65}Te_{0.35} High Reflectance Thin Films, Ayman Ahmed El-Amin, Aly Mohammed Badr, Foaud Abdel-Wahaab Jan 2007

Optical Properties And Determination Of Thermal Transformation Parameters For Se_{0.65}Te_{0.35} High Reflectance Thin Films, Ayman Ahmed El-Amin, Aly Mohammed Badr, Foaud Abdel-Wahaab

Turkish Journal of Physics

Chalcogenide glasses Se-Te have been prepared from the high purity constituent elements. Thin films of these materials have been deposited by vacuum evaporation. The thickness effects on the optical properties have been performed for the as-deposited films. The impact of varying thickness on the value of the optical gap is also reported and discussed. The resultant films were in amorphous nature. The reflectance and transmittance spectra were measured for the mentioned films and analyzed in the incident photon energy range from 1.16 to 2.47 eV. The refractive indices were determined as a function of wavelength via the transmittance analysis in …

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Electrical Resistivity Of Liquid Alkali Na-Based Binary Alloys, Aditya M. Vora Jan 2007

Electrical Resistivity Of Liquid Alkali Na-Based Binary Alloys, Aditya M. Vora

Turkish Journal of Physics

The study of the electrical resistivity \rho_L of alkali Na-based binary alloys Na_{1-x}Li_x, Na_{1-x}K_x, Na_{1-x}Rb_x and Na_{1-x}Cs_x have been made by well-recognized model potential of Gajjar et al. The most recent exchange and correlation functions due to Farid et al (F) and Sarkar et al (S) are used for the first time in the study of electrical resistivity of liquid binary mixtures and found suitable for such study. The results, due to the inclusion of Sarkar et al's local field correction function, are found superior to those obtained due to Farid et al's local field correction function. Electrical resistivity of …

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2d Maxy--Jres Nmr Spectroscopy Of Ch_Nch_M (Ca_Ncx_M) Groups: Product Operator Theory And Simulation, İrfan Şaka, Sedat Gümüş, Azmi̇ Gençten Jan 2007

2d Maxy--Jres Nmr Spectroscopy Of Ch_Nch_M (Ca_Ncx_M) Groups: Product Operator Theory And Simulation, İrfan Şaka, Sedat Gümüş, Azmi̇ Gençten

Turkish Journal of Physics

There exist a variety of multi-pulse NMR experiments for spectral editing of complex molecules in solution. Maximum quantum correlation NMR spectroscopy (MAXY NMR) is one of the techniques for distinguishing CH_n groups by editing ^1H NMR spectra. Spectral assignments of 2D homonuclear J-resolved NMR spectroscopy become too difficult, due to complex overlapping spectra. In order to overcome this problem a new technique called 2D MAXY-JRES NMR spectroscopy, which is the combination of MAXY NMR and homonuclear J-resolved NMR spectroscopy techniques, is used. In this study, product operator theory of 2D MAXY-JRES NMR spectroscopy is performed for IS_n I'S'_m (I = …

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Comparison Of The Antibacterial Effects Of Two Local Anesthetics: Lidocaine And Articaine, Kadi̇r Kaya, Seyyal Rota, Bora Doğan, Gi̇zem Kökten, Berri̇n Günaydin, Gülendam Bozdayi Jan 2007

Comparison Of The Antibacterial Effects Of Two Local Anesthetics: Lidocaine And Articaine, Kadi̇r Kaya, Seyyal Rota, Bora Doğan, Gi̇zem Kökten, Berri̇n Günaydin, Gülendam Bozdayi

Turkish Journal of Medical Sciences

Aim: The antibacterial effect of lidocaine has been studied widely, but the effect of articaine has not yet been evaluated. We aimed to investigate whether commercially available articaine possesses bactericidal or bacteriostatic effect in comparison with lidocaine in a prospective laboratory setting. Materials and Methods: The antibacterial effects of articaine and lidocaine were studied on Pseudomonas aeruginosa ATCC27853, Staphylococcus aureus ATCC25923, Escherichia coli ATCC35218, and Proteus mirabilis ATCC7002 strains and a patient isolate of Serratia marcescens. For this study, 2% lidocaine HCl and articaine HCl were diluted to 10, 5, 2.5, 1.25, 0.625, 0.312, 0.156, and 0.078 mg ml^{-1} concentrations …

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Risk Factors For Fecal Carriage Of Extended-Spectrum Beta-Lactamase Producing Escherichia Coli And Klebsiella Spp. In The Community, Özlem Kurt Azap, Hande Arslan, Sedef Ö. Karaman, Turhan Togan Jan 2007

Risk Factors For Fecal Carriage Of Extended-Spectrum Beta-Lactamase Producing Escherichia Coli And Klebsiella Spp. In The Community, Özlem Kurt Azap, Hande Arslan, Sedef Ö. Karaman, Turhan Togan

Turkish Journal of Medical Sciences

Aim: Community-acquired infections caused by extended-spectrum beta-lactamase (ESBL)-producing bacteria are an emerging problem. Digestive tract colonization is a prerequisite for infections by ESBL-producing microorganisms. The aim of this study was to determine the prevalence of and risk factors for fecal carriage of ESBL-producing Escherichia coli (E. coli) or Klebsiella spp. in the community. Materials and Methods: A total of 928 stool samples admitted to the laboratory during a four-month period were included in the study. Samples were diluted in saline and cultured in two EMB agar plates supplemented with either 1 µg/ml cefotaxime or 1 µg/ml ceftazidime. All isolates that …

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The Role Of Periodontal Disease On Acute Phase Proteins In Patients With Coronary Heart Disease And Diabetes, Gonca Çayir Keleş, Burcu Özkan Çeti̇nkaya, Selen Burçak Şi̇mşek, Di̇yar Köprülü, Hakki Kahraman Jan 2007

The Role Of Periodontal Disease On Acute Phase Proteins In Patients With Coronary Heart Disease And Diabetes, Gonca Çayir Keleş, Burcu Özkan Çeti̇nkaya, Selen Burçak Şi̇mşek, Di̇yar Köprülü, Hakki Kahraman

Turkish Journal of Medical Sciences

Aims: Chronic infections such as periodontal disease (PD) have been suggested to be a risk factor for coronary heart disease (CHD). Elevated levels of acute phase proteins are associated with increased risk for cardiovascular events in both healthy individuals and patients with known CHD. This study aimed to investigate the role of PD on C-reactive protein (CRP) and fibrinogen levels in patients with either CHD or type 2 diabetes. Materials and Methods: 80 subjects were evaluated in four groups: individuals with CHD+PD (group 1; n: 20), individuals with type 2 diabetes+PD (group 2; n: 20), individuals with PD without any …

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Water Sorption And Solubility Of Different Luting And Restorative Dental Cements, Fi̇li̇z Keyf, S. Hakan Tuna, Murat Şen, Agnes Safrany Jan 2007

Water Sorption And Solubility Of Different Luting And Restorative Dental Cements, Fi̇li̇z Keyf, S. Hakan Tuna, Murat Şen, Agnes Safrany

Turkish Journal of Medical Sciences

Aim: The purpose of this study was to compare the water sorption and solubility of four provisional, three permanent luting cements and five restorative cements. Methods: A split ring mould was fabricated for the preparation of specimen discs which were 15.0 mm in diameter and 1.5 mm thick. All specimens were manipulated according to the manufacturer's instructions and then subjected to water sorption and solubility tests. Data were analysed with Wilcoxon Signed Ranks Test. Scanning electron microscopy was used to evaluate surface topography and roughness. Results: All tested materials demonstrated different degrees of sorption and solubility. The difference between sorption …

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Brain Perfusion Single-Photon Emission Computed Tomography Findings In A Patient With Aicardi Syndrome, Mustafa Aydin, Tansel Ansal Balci, Ni̇met Kabakuş Jan 2007

Brain Perfusion Single-Photon Emission Computed Tomography Findings In A Patient With Aicardi Syndrome, Mustafa Aydin, Tansel Ansal Balci, Ni̇met Kabakuş

Turkish Journal of Medical Sciences

Aicardi syndrome is a rare X-linked dominant genetic disorder characterized by infantile spasms, agenesis or hypogenesis of the corpus callosum, and chorioretinal lacunae. There remain many unresolved questions regarding the clinical features of this disorder. Recent advancements in neuroimaging techniques have allowed us to obtain information about brain development and perfusion. Thus, we present herein the brain single-photon emission computed tomography (SPECT) findings in a 15-month-old female with Aicardi syndrome, which revealed that perfusion had shifted from the posterior to anterior regions. Furthermore, the right temporal lobe was not visualized, while significant hypoperfusion was determined on the occipital regions and …

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