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Articles 13711 - 13740 of 15009
Full-Text Articles in Entire DC Network
Lattice Changes In Shape Memory Cuznal Alloys On Aging At Room Temperature, Seyfetti̇n Çakmak, Ekrem Artunç, Nejdet Kayali, Osman Adigüzel
Lattice Changes In Shape Memory Cuznal Alloys On Aging At Room Temperature, Seyfetti̇n Çakmak, Ekrem Artunç, Nejdet Kayali, Osman Adigüzel
Turkish Journal of Physics
The aging behavior of CuZnAl martensites (Cu-21.62 wt.% Zn-5.68 wt.% Al and Cu-24.98 wt.% Zn-4.43 wt.% Al) at about 297 K was studied by analyzing diffraction line profiles obtained by X-ray diffractometry. For the alloys, the change of the lattice parameters and the tetragonality associated with the aging time at room temperature were investigated. The habit planes versus the aging time at room temperature were calculated using the De Vos-Aernoundt-Delaey model, based on the crystallographic theory of Wechsler-Lieberman-Read(WLR), and from the DO_{3}\rightarrow 18R martensite transformation theory.
Physical Properties Of Melt-Cast Annealed Bi_{1.6}Pb_{0.4}Sr_{2}Ca_{3}Cu_{4} O_{12} Compound, Ati̇lla Coşkun, Beki̇r Özçeli̇k, Keri̇m Kiymaç
Physical Properties Of Melt-Cast Annealed Bi_{1.6}Pb_{0.4}Sr_{2}Ca_{3}Cu_{4} O_{12} Compound, Ati̇lla Coşkun, Beki̇r Özçeli̇k, Keri̇m Kiymaç
Turkish Journal of Physics
A Bi_{1.6}Pb_{0.4}Sr_{2}Ca_{3}Cu_{4}O_{12} compound was produced by melt-casting method. The microstructure of the sample was studied by Scanning Electron Microscopy. Phase analysis was carried out by X-ray diffraction patterns and EDAX. The electrical resistance exhibites the existance of a superconducting phase with an onset temperature T_{c} at 110 K along with a minor phase with an onset T_{c} at 80 K. It has been found that the superconducting phase temperature T_{c} increases with increasing sintering temperature.
Effect Of Nitriding On Phase Transformations In The Fe-Mn Alloys, K. G. Binnatov, I. I. Ali-Zade, A. O. Mekhrabov
Effect Of Nitriding On Phase Transformations In The Fe-Mn Alloys, K. G. Binnatov, I. I. Ali-Zade, A. O. Mekhrabov
Turkish Journal of Physics
We present results concerning the nitriding effects on phase transformations in Fe -- 40 at. % Mn and Fe -- 50 at. % Mn alloys. These alloys were studied by means of X-ray diffraction and Mössbauer-effect spectroscopy methods at room temperature. Results indicate that, after nitriding, in the absorption spectra of these alloys appears lines with hyperfine field H\sim 330 kOe which corresponds to the field on the ^{57} Fe nuclei in the \alpha -Fe. Annealing of the alloys at 650 ^oC temperature (nitriding temperature) in argon atmosphere do not change the form of the M\\"{o}ssbauer absorption spectra. It appears …
The Effect Of Phonon Drag Of Charge Carriers In In_{1 - X} Ga_{X} Sb, Sadiyar Ahmedoglu Zeynalov
The Effect Of Phonon Drag Of Charge Carriers In In_{1 - X} Ga_{X} Sb, Sadiyar Ahmedoglu Zeynalov
Turkish Journal of Physics
The temperature dependencies of the thermal power a_{0} and thermal conductivity \kappa in two samples of In_{1 - x} Ga_{x}Sb (x=0.65 and 0.45) doped by {Te\sim } 0.001 at\%, with electron concentration n = 5.9 \cdot 10^{16} and 1.3 \cdot 10^{17} cm^{ - 3} (at 100K), have been investigated. It is shown that in In_{0.35}Ga_{0.65}Sb a_{0} increases with decreasing T below 50K. At 14K a_{0} passes through maximum and it falls sharply with decreasing T. It is shown that the maximum value of a_{0} is in agreement with the maximum value of \kappa . In In_{0.55}Ga_{0.45}Sb, starting from T = …
Characteristics Of The Weathering Zones Developed Within The Tuffs Of The Midas Monument, Tamer Topal, Burak Sözmen
Characteristics Of The Weathering Zones Developed Within The Tuffs Of The Midas Monument, Tamer Topal, Burak Sözmen
Turkish Journal of Earth Sciences
The Midas monument, an impressive cult facade located in the southern part of the Eskişehir province in central Anatolia, Turkey, was made within tuffs (white and pink), which now have deterioration problems. In this study, the depth and characteristics of the weathering zones that have developed in the white and pink tuffs have been investigated through thin-section studies, X-ray powder diffractometry, methylene blue adsorption tests, major-element analyses, and some index parameters. It has been determined that the feldspar minerals are mechanically fractured due to weathering. The tuffs contain small amounts of clay minerals. An approximately 1-cm-thick silica-rich zone has developed …
Development Of A Basic Gis Database For The Yeşilırmak Watershed Provinces Using Satellite Images And Other Data, Hülya Yildirim, Erhan Alparslan, Mehmet Emi̇n Özel, Ci̇hangi̇r Aydöner, Samuray Eli̇taş, Nalan Jale Di̇van, Mehmet Dağci, Asli Süha Dönertaş
Development Of A Basic Gis Database For The Yeşilırmak Watershed Provinces Using Satellite Images And Other Data, Hülya Yildirim, Erhan Alparslan, Mehmet Emi̇n Özel, Ci̇hangi̇r Aydöner, Samuray Eli̇taş, Nalan Jale Di̇van, Mehmet Dağci, Asli Süha Dönertaş
Turkish Journal of Earth Sciences
Remote-sensing and geographic-information-systems (GIS) techniques were jointly used in this study to establish a GIS database system for the Yeşilırmak watershed provinces, which include Amasya, Tokat, Çorum, Yozgat and Samsun. Composite multicolour images (down to 6 m resolution) from the LANDSAT TM and Indian IRS C/D satellites, land-use/land-cover maps derived from these images, road networks, soil information, digital terrain model, slope and aspect information derived from digital elevation data and meteorological data at province level are the major constituents of this database. A 'project office' has been established with trained personnel at each province centre to effectively use the resultant …
Some Physical Characteristics And Utilization Of Coarse Fiber Obtained From Hair Goats, Gürsel Dellal, Ayhan Eli̇çi̇n, Feryal Söylemezoğlu, Zeynep Erdoğan, İbrahi̇m Zafer Arik
Some Physical Characteristics And Utilization Of Coarse Fiber Obtained From Hair Goats, Gürsel Dellal, Ayhan Eli̇çi̇n, Feryal Söylemezoğlu, Zeynep Erdoğan, İbrahi̇m Zafer Arik
Turkish Journal of Veterinary & Animal Sciences
In this research, some physical characteristics and uses of the coarse fibers obtained from hair goats raised in some provinces of Turkey were examined. For the general provinces, the diameter of fiber and natural length of fiber were 92.1±0.56 µ and 11.6±1.37 cm resepctively. According to the findings, the coarse fibres of hair goats can be used in products such as tents, stiffening cloth, card weaving, floor weaving (çul ve cicim), saddle-bags, bags, sacks, animal feeding bags and socks.
Cover And Contents
Turkish Journal of Veterinary & Animal Sciences
No abstract provided.
The Effects Of Physical Texture Of Feed And Feeding Regime On The Gizzards Of Broilers, Bahri̇ Yildiz, Hüseyi̇n Yildiz, Ali̇ Bahadir
The Effects Of Physical Texture Of Feed And Feeding Regime On The Gizzards Of Broilers, Bahri̇ Yildiz, Hüseyi̇n Yildiz, Ali̇ Bahadir
Turkish Journal of Veterinary & Animal Sciences
The effects of physical texture of feed and feeding regimes in broiler's gizzards were observed. Firstly, chicks were divided into three groups. The chicks in groups A, B and C were fed on mash, mash + pellet and crumble + pellet respectively. These groups were exposed to ad libitum and meal feeding, and grit was added to this feed. On day fourty-two, the chicks were sacrificed and the characteristics of the gizzard were observed. The impact of adding grit to the broiler rations on the weight and volume of the gizzard of broiler having ad-libitum rations was investigated. Statistically significant …
Cover And Contents
Turkish Journal of Veterinary & Animal Sciences
No abstract provided.
Computational Study For The Structural Change Of The System Cdte_{1-X} S_X Thin Film, Emad Khdayer Al-Shakarchi
Computational Study For The Structural Change Of The System Cdte_{1-X} S_X Thin Film, Emad Khdayer Al-Shakarchi
Turkish Journal of Physics
Polycrystalline thin film of the graded system CdTe_{1-x}S_{x} for x=0,0.1,\ldots,1 are prepared by using thermal evaporation technique deposited on the glass substrate with an average thickness 3000 Å for each individual value of x . XRD technique is used with the aid of a computational program to study the phase change from cubic zinc blend structure to hexagonal wurtzite with an inversion point related to the x-value. It is found that x=0.1 gives us an inversion point in the structural change from cubic to hexagonal phase.
A Theoretical Model For The Non-Linear Susceptibility Of The Antiferromagnetic Systems, Beki̇r Özçeli̇k, Keri̇m Kiymaç, Ahmet Eki̇ci̇bi̇l
A Theoretical Model For The Non-Linear Susceptibility Of The Antiferromagnetic Systems, Beki̇r Özçeli̇k, Keri̇m Kiymaç, Ahmet Eki̇ci̇bi̇l
Turkish Journal of Physics
In this study, we have developed a general theoretical model, based upon the simple mean field model of N\'{e}el, for the non-linear response of an antiferromagnetic system. The results indicate that the odd order derivatives, (d^{2n + 1}m_{a})_{0} = (-d^{2n + 1}m_{b})_{0}, where n=1,2,3......, will diverge and the even order derivatives, (d^{2n}m_{a})_{0} = (d^{2n}m_{b})_{0} will vanish due to the symmetry of two sublattices, ``a'' and ``b'', forming the antiferromagnet. This model also supports our experimental results performed on two antiferromagnetic samples, namely, Cs_{2}MnCl_{4}.2H_{2}O and MnCl_{2}.4H_{2}O [1].
Iba-1 Calculations Of E2/M1 Mixing Ratios And Quadrupole Moments In ^{154}Gd, Mehmet Baylan
Iba-1 Calculations Of E2/M1 Mixing Ratios And Quadrupole Moments In ^{154}Gd, Mehmet Baylan
Turkish Journal of Physics
In this study the Interacting Boson Approximation is applied in its basic form (IBA-1) to the calculation of gamma-ray E2/M1 multipole mixing ratios and quadrupole moments [Q( 2^{+} )] of electromagnetic transitions in ^{154}Gd. The numerical results obtained for ^{154}Gd are in reasanably good agreement with previous experimental and theoretical values.
Excitation Plus Ionization In Electron-Atom Collisions To He^{+} (N=2): (E,2e), (E, E\Gamma ) And (E, 2e\Gamma ) Studies, Mevlut Dogan, Albert Crowe
Excitation Plus Ionization In Electron-Atom Collisions To He^{+} (N=2): (E,2e), (E, E\Gamma ) And (E, 2e\Gamma ) Studies, Mevlut Dogan, Albert Crowe
Turkish Journal of Physics
Simultaneous excitation-ionization of helium atoms by electron impact is observed by the coincidence detection of the outgoing particles. The relationship between (e,2e), (e,e\gamma ) and (e,2e\gamma ) experiments is discussed.
Covariant Two Fermion Equations With Anomalous Moments, Ahmet Turan Alan, Z. Zekeri̇ya Aydin, Nuretti̇n Karagöz, Ali̇ Ulvi̇ Yilmazer
Covariant Two Fermion Equations With Anomalous Moments, Ahmet Turan Alan, Z. Zekeri̇ya Aydin, Nuretti̇n Karagöz, Ali̇ Ulvi̇ Yilmazer
Turkish Journal of Physics
We derive covariant equations for two-fermion systems, taking into account the anomalous magnetic moments of the particles.
Double Transition Effect In Anderson Transition, Hüseyi̇n Aktaş
Double Transition Effect In Anderson Transition, Hüseyi̇n Aktaş
Turkish Journal of Physics
In this work we have studied the electronic mobility \mu within a completely disordered lattice system by using the strong interatomic hopping potential V(r) = ( - {\frac{{r}}{{a_{o}} }}) \exp( - r / a_{o} ) for site representation of the Hamiltonian. It is shown that a metallic system of a completely disordered lattice first goes insulating and then goes back to metallic again at higher atomic density \rho .
Magnetization Measurements On Electrodeposited Cu_{1 - X}Co_{X} Alloy Films, Ömer F. Bakkaloğlu, İsmai̇l H. Karahan, Hasan Efeoğlu, Muhammet Yildirim, Uğur Çevi̇k, Yahya Kemal Yoğurtçu
Magnetization Measurements On Electrodeposited Cu_{1 - X}Co_{X} Alloy Films, Ömer F. Bakkaloğlu, İsmai̇l H. Karahan, Hasan Efeoğlu, Muhammet Yildirim, Uğur Çevi̇k, Yahya Kemal Yoğurtçu
Turkish Journal of Physics
The magnetic properties of Cu_{1 - x}Co_{x} alloy films prepared by electrodeposition technique were investigated by Alternating Gradient Force Magnetometer. The magnetization curves of Cu_{0.94}Co_{0.06}, Cu_{0.87}Co_{0.13} and Cu_{0.74}Co_{0.26} films were easily saturated while the other Cu_{1 - x}Co_{x} samples with x= 0.17, 0.19 and 0.21 had more inclined magnetization curves. The saturation magnetization value of Cu_{1 - x}Co_{x} film increased with increasing Co content in the film. The minimum values of the ratio of remanence to magnetization and the coercive field were determined in the Cu_{0.81}Co_{0.19} alloy film among the others. The ferromagnetic order in the Cu_{1 - x}Co_{x} films …
Path Integral Treatment For Spinless Relativistic Equation In The Two Component Theory, M. Merad, T. Boudjedaa, Lyazid Chetouani
Path Integral Treatment For Spinless Relativistic Equation In The Two Component Theory, M. Merad, T. Boudjedaa, Lyazid Chetouani
Turkish Journal of Physics
In this paper we have set up a path integral formalism for Feshbach-Villars equation by using the fermionic Schwinger model for Pauli matrices which describe an isocharge symmetry. This choice is made in analogy with spin model and the coherent state representation is then used. We have also given a general method of treating the problem of vanishing scalar potential by reducing it the to non-relativistic case and then, via Foldy-Wouthuysen canonical transformation, an explicit solution is constructed. The free case and constant magnetic field interaction are explicitly exposed. In each cases the propagators are evaluated and the energy spectrum …
Optical Transmission Measurements On Glow-Discharge Amorphous Silicon Nitride Films, İlker Ay, Hüseyi̇n Tolunay
Optical Transmission Measurements On Glow-Discharge Amorphous Silicon Nitride Films, İlker Ay, Hüseyi̇n Tolunay
Turkish Journal of Physics
Hydrogenated amorphous silicon nitride films have been prepared by the glow-discharge decomposition of ammonia/silane gas mixture. From optical transmission measurements in the wavelength range from 400 nm to 1100 nm refractive indices absorption coefficients and optical Tauc gaps of the films have been obtained. A systematic investigation of optical parameters has been carried out as a function of the nitrogen content of samples.
Determination Of The Trapping Parameters Of Glow Peaks Of Caf2:Dy(Tld-200) By Using Computer Glov Curve Deconcolution Method, A. Necmeddi̇n Yazici, M. Yakup Hacii̇brahi̇moğlu
Determination Of The Trapping Parameters Of Glow Peaks Of Caf2:Dy(Tld-200) By Using Computer Glov Curve Deconcolution Method, A. Necmeddi̇n Yazici, M. Yakup Hacii̇brahi̇moğlu
Turkish Journal of Physics
Computerized glow curve deconvolution method is used to determine the number of peaks, the order of kinetics b, the activation energy E_a,frequency factor s and number of the trapped electrons n_0 associated with the glow peaks in single crystal of CaF_2:Dy (TLD-200). Glow curve analysis indicate that the glow curve in the temperature region between room temperature and 250 ^oC can be best described as a superposition of six peaks. First five peaks are described by first-order kinetics and sixth peak general-order kinetic. The number of trapped electrons, activation energies and frequency factor for individual glow peaks are as follows: …
Preparation Of Pb Doped 110 K Phase Bisrcacuo Thick Films By Screen Printing, Ertan Şahi̇n, Necdet Baştürk
Preparation Of Pb Doped 110 K Phase Bisrcacuo Thick Films By Screen Printing, Ertan Şahi̇n, Necdet Baştürk
Turkish Journal of Physics
Thick Films of Bi_2Sr_2Ca_2Cu_3O_x were obtained on cleaved MgO (100) substrates from a component gel of stoichiometric composition with partial Pb substitution of Bi. Formation employeed screen printing method. Films were subjected two step annealing at temperatures above 850^oC and 880^\oC for the formation of the crystal structure and to attain superconducting properties. X-ray diffraction patterns and R-T measurements showed coexistence of the (2212) and (2223) phases for most of the films. Metallic behaviour in resistance and 110 K onset temperature were observed for good quality films with a completed superconducting transition between 78-103 K. Critical current densities were found …
Vacuum Cryostat's Pressure Dependent Dark Conductivity Measurements On A-Si:H And A-Sin:H Films, İlker Ay, Hüseyi̇n Tolunay
Vacuum Cryostat's Pressure Dependent Dark Conductivity Measurements On A-Si:H And A-Sin:H Films, İlker Ay, Hüseyi̇n Tolunay
Turkish Journal of Physics
The electrical properties of a-Si:( H ) and a- SiN ):( H ) films prepared by plasma deposition from SiH_4+NH_3 gas mixtures have been investigated. We observed anomalous peaks in the temperature dependent dark conductivity curves of annealed a-Si:H and a-SiN:H samples when the temperatures were increased from 90 K to room temperature at a constant heating rate. To study the surface adsorption effect, vacuum cryostat pressure dependence of these peaks are investigated. We have also studied the effect of nitrogen on these observed peaks in dark conductivity.