Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
-
- Turkey (105)
- 1 (99)
- 2 (82)
- Classification (70)
- Optimization (65)
-
- Deep learning (61)
- Genetic algorithm (61)
- Machine learning (61)
- Synthesis (61)
- Adsorption (53)
- Particle swarm optimization (51)
- Antimicrobial activity (47)
- Geochemistry (47)
- 3 (44)
- Stability (39)
- Artificial neural network (37)
- Phthalocyanine (35)
- Support vector machine (34)
- Feature extraction (32)
- Wireless sensor networks (31)
- Antibacterial activity (29)
- Artificial neural networks (28)
- Feature selection (28)
- Copper (27)
- Cytotoxicity (27)
- Power quality (27)
- Fuzzy logic (26)
- Molecular docking (26)
- Palladium (26)
- Preconcentration (26)
- Publication Year
Articles 4381 - 4410 of 10319
Full-Text Articles in Physical Sciences and Mathematics
A Promising Materials Approach To Combatting Renal Hyperphosphatemia: Fe(Ii)-Montmorillonites, Xiaotong Yuan, Dawei Qin, Min Qiao, Gang Liu, Hongxin Li, Xia Niu
A Promising Materials Approach To Combatting Renal Hyperphosphatemia: Fe(Ii)-Montmorillonites, Xiaotong Yuan, Dawei Qin, Min Qiao, Gang Liu, Hongxin Li, Xia Niu
Turkish Journal of Chemistry
The objective of the current effort was to determine the efficacy of Fe(II)-montmorillonite (Fe(II)-MMT) as an adjuvant for specific targeted adsorption of phosphate. Specifically, Fe(II)-MMT was studied to combat hyperphosphatemia and anemia arising from chronic renal failure. The adsorption of phosphate over time, pH, and initial concentration was studied. The systems were characterized by X-ray diffraction (XRD), Raman, and zeta potential. The experimental results demonstrated the adsorption time was set to 140 min to achieve maximum adsorption efficiency. It was thus found that the maximum adsorption was at pH 3.0. In addition, it reached equilibrium when the initial phosphate concentration …
Ultrasound-Assisted Surfactant/Ionic Liquid Aqueous Two-Phase System Extraction Prior To High Performance Liquid Chromatography For The Determination Of Tetracyclines In Milk And Honey Samples, Hayri̇ye Mi̇ne Antep, Taşkin Mumcu, Kami̇l Bostanci, Serap Seyhan Bozkurt, Melek Merdi̇van
Ultrasound-Assisted Surfactant/Ionic Liquid Aqueous Two-Phase System Extraction Prior To High Performance Liquid Chromatography For The Determination Of Tetracyclines In Milk And Honey Samples, Hayri̇ye Mi̇ne Antep, Taşkin Mumcu, Kami̇l Bostanci, Serap Seyhan Bozkurt, Melek Merdi̇van
Turkish Journal of Chemistry
In this work, an ultrasonic-assisted surfactant/ionic liquid aqueous two-phase system (ATPS) extraction method was developed to extract six tetracycline antibiotics from food samples before their chromatographic determination using high performance liquid chromatography. The ATPS was formed with 1-allyl-3-methyl-imidazolium bromide, Triton X-100, and dipotassium hydrogen phosphate. The parameters including type and amount of surfactant, ionic liquid and salt, pH of sample solution, and sonication time were optimized. Under the optimized conditions, linear calibration curves of the six tetracyclines were obtained in the range of 10--500 $\mu $g L$^{-1}$ with $>$ r$^{2} =$ 0.990 (n $=$ 9). The proposed green analytical …
Adsorption Of Copper Ions And Alizarin Red S From Aqueous Solutions Onto A Polymeric Nanocomposite In Single And Binary Systems, Omnia Ali, Sahar Mohamed
Adsorption Of Copper Ions And Alizarin Red S From Aqueous Solutions Onto A Polymeric Nanocomposite In Single And Binary Systems, Omnia Ali, Sahar Mohamed
Turkish Journal of Chemistry
Adsorption of Cu(II) ions and alizarin red S (ARS) has been studied using beads of chitosan (CS) and a chitosan/ZnO nanorod composite (CS-ZnO) in single and binary systems. The beads were synthesized and characterized using Fourier transform infrared spectroscopy, X-ray diffraction, high-resolution transmission electron microscopy, scanning electron microscopy, and energy dispersive X-ray analysis. Factors affecting adsorption of Cu(II) ions and ARS such as pH and initial concentrations as well as adsorption kinetics, isotherms, thermodynamics, reusability, and competitive adsorption in binary systems were studied. The results showed that the adsorption kinetics and isotherm data for both adsorbates followed a pseudo-second-order model …
Spectrophotometric Detection Of Rhodamine B In Tap Water, Lipstick, Rouge, And Nail Polish Samples After Supramolecular Solvent Microextraction, Nebi̇ye Özkantar, Mustafa Soylak, Mustafa Tüzen
Spectrophotometric Detection Of Rhodamine B In Tap Water, Lipstick, Rouge, And Nail Polish Samples After Supramolecular Solvent Microextraction, Nebi̇ye Özkantar, Mustafa Soylak, Mustafa Tüzen
Turkish Journal of Chemistry
A simple and sensitive supramolecular solvent-based dispersive liquid--liquid microextraction method was described for the separation/preconcentration and spectrophotometric detection of rhodamine B. The microextraction method, which was realized at ambient temperature for the detection of rhodamine B, was carried out by using supramolecular solvents such as tetrahydrofuran and decanoic acid. The method was based on analyses of rhodamine B by using UV-Vis spectrophotometry at 558 nm. The influences of some parameters such as pH, sample volume, eluent solutions, centrifugation time, and ultrasonic bath time were optimized. The effects of various matrix ions were also investigated. Moreover, the limit of detection and …
Magnet Design For The Storage Ring Of Turkay, Zafer Nergi̇z
Magnet Design For The Storage Ring Of Turkay, Zafer Nergi̇z
Turkish Journal of Physics
In synchrotron light sources the radiation is emitted from bending magnets and insertion devices (undulators, wigglers) placed on the storage ring by accelerating charged particles radially. The frequencies of produced radiation can range over the entire electromagnetic spectrum and have polarization characteristics. In synchrotron machines, the electron beam is forced to travel on a circular trajectory by the use of bending magnets. Quadrupole magnets are used to focus the beam. In this paper, we present the design studies for bending, quadrupole, and sextupole magnets for the storage ring of the Turkish synchrotron radiation source (TURKAY), which is in the design …
Remarks On The Treatments Of Nonsolvable Potentials, Bülent Gönül, Yücel Cançeli̇k
Remarks On The Treatments Of Nonsolvable Potentials, Bülent Gönül, Yücel Cançeli̇k
Turkish Journal of Physics
A recently introduced scheme is extended to propose an algebraic nonperturbative approach for the analytical treatment of Schrödinger equations with nonsolvable potentials involving an exactly solvable potential form together with an additional potential term. As an illustration the procedure is successfully applied to the Cornell potential by means of very simple algebraic manipulations. However, instead of providing numerical eigenvalues for the only consideration of the small strength of the related linear potential as in the previous reports, the present model puts forward a clean route to interpret related experimental or precise numerical results involving a wide range of the linear …
On The Calculus Of Parameterized Fractal Curves, Alireza Khalili Golmankaneh
On The Calculus Of Parameterized Fractal Curves, Alireza Khalili Golmankaneh
Turkish Journal of Physics
In this paper, we apply $F^{\alpha}$-calculus on the fractal Koch and Ces\`{a}ro curves with different dimensions. A generalized Newton's second law on the fractal Koch and Ces\`{a}ro curves is given. Density of the moving particles absorbed on fractal Ces\`{a}ro are derived. Illustrative examples are given to present the details of $F^{\alpha}$-integrals and $F^{\alpha}$-derivatives.
Temperature Measurements In A Manufactured Rf Plasma Jet In Various Ar/N$_{2}$ Mixtures, Mohammad Nasir Rostami Ravari, Alireza Ganjovi, Farideh Shojaei, Amir Falahat
Temperature Measurements In A Manufactured Rf Plasma Jet In Various Ar/N$_{2}$ Mixtures, Mohammad Nasir Rostami Ravari, Alireza Ganjovi, Farideh Shojaei, Amir Falahat
Turkish Journal of Physics
In this paper, using the optical emission spectroscopy technique, a comparative study is performed on the argon excitation and nitrogen vibrational temperatures in the plasma discharge medium of a manufactured RF plasma jet. The argon contribution in the Ar/N$_{2}$ mixture is varied from 70% to 98% and the obtained optical emission spectra from argon and molecular nitrogen are analyzed. The highest emission intensities of neutral argon (Ar I) are recorded in the wavelength range of 790-850 nm. It is seen that, at the higher argon percentages in the mixture, the emission intensity from all the formed species in the plasma …
Determination Of Height Profile From A Two-Dimensional Fringe Signal Using A Two-Dimensional Continuous Wavelet Transform, Özlem Kocahan Yilmaz
Determination Of Height Profile From A Two-Dimensional Fringe Signal Using A Two-Dimensional Continuous Wavelet Transform, Özlem Kocahan Yilmaz
Turkish Journal of Physics
The main objective of this study was 3-dimensional (3D) profile measurements with standard fringe projection, consisting of a CCD and a projector. For obtaining height information of objects pixel by pixel, phases have to be calculated from the images taken by the fringe projection technique. In this study, the 2-dimensional continuous wavelet transform (2D CWT) phase method was used for phase extraction. 1D and 2D CWT analyses of noisy images were compared in simulations performed for a 2-dimensional fringe signal by introducing the carrier frequencies in two spatial directions, $x $ and $y$. Profile measurement of an object was made …
Organic Geochemical Characteristics And Depositional Environment Of Lower-Middle Miocene Küçükkuyu Formation, Edremit Gulf, Nw Turkey, Ayşe Bozcu
Turkish Journal of Earth Sciences
The Lower-Middle Miocene Küçükkuyu Formation crops out extensively in the Edremit Gulf area (NW Turkey). In this study, shale samples from this unit were investigated to evaluate source rock characteristics, depositional conditions, and hydrocarbon potential. Outcrop samples of the Küçükkuyu Formation were taken from different locations and analyzed by Rock-Eval pyrolysis, vitrinite reflectance (Ro), stable carbon isotope (δ13C), total sulfur (TS), gas chromatography (GC), and gas chromatography-mass spectrometry (GC-MS). The total organic carbon (TOC) values range from 0.23 to 6.1 wt.% with an average of 1.76 wt.% for the northern samples and 0.24 to 2.82 wt.% with an average of …
Higher-Resolution Biostratigraphy For The Kinta Limestone And An Implication For Continuous Sedimentation In The Paleo-Tethys, Western Belt Of Peninsular Malaysia, Haylay Tsegab Gebretsadik, Chow Weng Sum, Gatovsky A.Yuriy, Aaron W. Hunter, Jasmi Ab Talib, Solomon Kassa
Higher-Resolution Biostratigraphy For The Kinta Limestone And An Implication For Continuous Sedimentation In The Paleo-Tethys, Western Belt Of Peninsular Malaysia, Haylay Tsegab Gebretsadik, Chow Weng Sum, Gatovsky A.Yuriy, Aaron W. Hunter, Jasmi Ab Talib, Solomon Kassa
Turkish Journal of Earth Sciences
The paleogeography of the juxtaposed Southeast Asian terranes, derived from the northeastern margins of Gondwana during the Carboniferous to Triassic, resulted in complex basin evolution with massive carbonate deposition on the margins of the Paleo-Tethys. Due to the inherited structural and tectonothermal complexities, discovery of diagnostic microfossils from these carbonates has been problematic. This is particularly the case for the Kinta Limestone, a massive Paleozoic carbonate succession that covers most of the Kinta Valley in the central part of the Western Belt of Peninsular Malaysia. Owing to the complex structural and igneous events, as well as extensive diagenetic alterations, establishing …
Evaluation Of Hydrogeochemical And Isotopic Properties Of The Geothermal Waters In The East Of Mount Sabalan, Nw Iran, Rahim Masoumi, Ali Asghar Calagari, Kamal Siahcheshm, Soheil Porkhial
Evaluation Of Hydrogeochemical And Isotopic Properties Of The Geothermal Waters In The East Of Mount Sabalan, Nw Iran, Rahim Masoumi, Ali Asghar Calagari, Kamal Siahcheshm, Soheil Porkhial
Turkish Journal of Earth Sciences
The Mount Sabalan district is regarded as the best place to investigate geothermal activities in northwest Iran. Since the last episode of volcanic activity in the Plio-Quaternary time, hot springs and surficial steams as conspicuous manifestation of geothermal activities have appeared around the slopes of Mount Sabalan. The hot fluids circulating in this geothermal field contains anions chiefly of HCO3- and Cl-; however, SO42- content in some water samples is relatively high, imparting sulfate characteristics to such fluids. Geothermometric studies provided compelling evidence for estimation of the reservoir temperature (~150 °C) in the study areas. Thus, in this respect, the …
Linear Instability Of Dust Acoustic Waves In A Magnetized Gravitating Plasma In The Presence Of Dust Streaming, Himangshu Sahoo, Basudev Ghosh, Kalyan Kumar Mondal
Linear Instability Of Dust Acoustic Waves In A Magnetized Gravitating Plasma In The Presence Of Dust Streaming, Himangshu Sahoo, Basudev Ghosh, Kalyan Kumar Mondal
Turkish Journal of Physics
Linear instability of dust acoustic waves (DAWs) has been theoretically studied in a collisionless gravitating dust-ion magnetized plasma including the effect of dust streaming. A linear dispersion relation has been derived by using the method of normal mode analysis. Gravitational effect is found to make the low-frequency DAW mode linearly unstable in certain parametric regions. The dependence of the growth rate of the instability on various plasma parameters such as streaming of dust particles, size of the dust grain, strength of the magnetic field, obliqueness of propagation, and number density of dust particles has been numerically analyzed and presented graphically.
A Theoretical Study Of Radio Wave Attenuation Through A Polycrystalline Silicon Solar Cell, Adama Ouedraogo, Vinci De Dieu Bokoyo Barandja, Issa Zerbo, Martial Zoungrana, Emmanuel Wendsongre Ramde, Dieudonne Joseph Bathiebo
A Theoretical Study Of Radio Wave Attenuation Through A Polycrystalline Silicon Solar Cell, Adama Ouedraogo, Vinci De Dieu Bokoyo Barandja, Issa Zerbo, Martial Zoungrana, Emmanuel Wendsongre Ramde, Dieudonne Joseph Bathiebo
Turkish Journal of Physics
One-dimensional study of both electronic and electrical parameters of a silicon solar cell in the presence or not of an electric field, a magnetic field, or an electromagnetic field does not take into account the grain size and the grain boundary recombination velocity. A three-dimensional study, on the contrary, takes those factors into account. However, the three-dimensional study poses the problem of the attenuation of the wave in the grain of the polycrystalline solar cell as well as the issue of finding the expressions of its components. This study aimed to solve these issues by considering radio waves, which are …
Higher-Dimensional Dust Collapse In F(R) Gravity, Zahid Ahmad, Muhammad Shoaib Khan
Higher-Dimensional Dust Collapse In F(R) Gravity, Zahid Ahmad, Muhammad Shoaib Khan
Turkish Journal of Physics
The $n+2$-dimensional gravitational collapse of pressureless fluid is investigated in metric $f(R)$ gravity. Matching conditions are derived by taking the $n+2$-dimensional Friedmann-Robertson-Walker (FRW) metric as interior spacetime and the $n+2$-dimensional Schwarzschild metric as exterior spacetime. In the analysis of the solution of field equations, the scalar curvature is assumed to be a constant. It is observed that the scalar curvature constant term $f(R_{0})$ slows the collapse.
Effect Of Pu Content On Uncertainty In Reactor Parameters Due To Use Of No Temperature Gradient In (U-Pu)O$_{2}$ Fuels, Mehmet Türkmen
Effect Of Pu Content On Uncertainty In Reactor Parameters Due To Use Of No Temperature Gradient In (U-Pu)O$_{2}$ Fuels, Mehmet Türkmen
Turkish Journal of Physics
Radial temperature distribution in a fuel rod is a parabolic function. Neutronics calculations are in general performed over a volume-averaged temperature by ignoring this distribution. Such an assumption results in an uncertainty in reactor design parameters. In this study, the magnitude of this uncertainty is estimated by solving the heat equation with a temperature-dependent conductivity coefficient coupled with a reactor physics code. The effect of radial fuel temperature distribution is investigated by representing the fuel region as multiregional. Uncertainty is investigated for various Pu contents of (U-Pu)O$_{2}$ fuel, a mix of depleted U and reactor-grade Pu. The effect of Pu …
Investigating The Instability Of The Torus Around The Blackhole In The Presence Of The Radial And Angular Velocity Perturbations, Orhan Dönmez
Turkish Journal of Physics
We have performed the numerical simulation of the perturbed relativistic torus around the black hole by solving the general relativistic hydrodynamics equations on the equatorial plane. We have monitored the different simple models by applying the radial and angular velocity perturbations to the steady state torus around the black hole. The instabilities are triggered by adding the subsonic velocity fields over the radial and angular velocities of the stable torus. We have found the disk instability so-called the Papaloizou-Pringle instability and excited modes of the Quasi-Periodic Oscillations (QPOs) in the thin disk approximation case. The significant oscillations and oscillation modes …
Relationships Between Sequence Stratigraphy And Diagenesis Of Corals And Foraminifers In The Middle Eocene, Northern Egypt, Mohamed Tawfik, Abdelbaset S. El-Sorogy, Mahmoud Moussa
Relationships Between Sequence Stratigraphy And Diagenesis Of Corals And Foraminifers In The Middle Eocene, Northern Egypt, Mohamed Tawfik, Abdelbaset S. El-Sorogy, Mahmoud Moussa
Turkish Journal of Earth Sciences
Outcrops of the Middle Eocene in northern Egypt represent a Tethyan reef-rimmed carbonate platform with bedded inner-platform facies. The diagenesis of these outcrops was studied in detail. The facies are characterized by a reef core, back reef and outer lagoon, shoal, inner lagoon, and tidal flat carbonate sequences. The diagenetic sequences on the scleractinian corals and foraminifers were thoroughly examined. These sequences show various diagenetic features during episodes of fluctuating sea levels and appear to be related to the primary composition of the studied components and the transgressive-regressive cycles. The carbonate diagenetic history of the examined samples successively includes marine-phreatic, …
Petrogenesis Of Plio-Quaternary Basanites In The Gandom Beryan Area, Kerman,Iran: Geochemical Evidence For The Low-Degree Partial Melting Of Enriched Mantle, Seyed Javad Yousefi, Abbas Moradian, Hamid Ahmadipour
Petrogenesis Of Plio-Quaternary Basanites In The Gandom Beryan Area, Kerman,Iran: Geochemical Evidence For The Low-Degree Partial Melting Of Enriched Mantle, Seyed Javad Yousefi, Abbas Moradian, Hamid Ahmadipour
Turkish Journal of Earth Sciences
In the Gandom Beryan area, basanitic lava flows erupted from fractures in the Nayband fault zone and formed an area of about 300 km2 of basanitic rocks in the western part of the Lut Block. Olivine and clinopyroxene are the major phenocrysts in a microlitic groundmass for these basanitic rocks. The geochemical data show that Gandom Beryan rocks are basanite in composition and belong to intercontinental rifts related to alkali basanites. These rocks have low Fe/Mg ratios (Fe2O3t/MgO = 1.07-1.43) with low silica content (SiO2 = 44.89-48.26 wt.%) and are high-Ti basanites. The investigated rocks are characterized by a significant …
Estimation Of The Crustal Structure In Central Anatolia (Turkey) Using Receiver Functions, Begüm Çivgin, Bülent Kaypak
Estimation Of The Crustal Structure In Central Anatolia (Turkey) Using Receiver Functions, Begüm Çivgin, Bülent Kaypak
Turkish Journal of Earth Sciences
The receiver function analysis method was used to determine the crustal structure in Central Anatolia, Turkey, by using teleseismic earthquake records. The method is based on the conversion of incident P waves into S waves reaching an interface in the crust or upper mantle and arrival of the converted wave to the station just after the direct P waves. A temporary seismic network, the Ankara Earthquake Monitoring Network (AnkNET), consisting of six broadband seismograph stations, has been deployed in order to monitor the seismicity in Ankara and its surroundings during the period of 2007?2010. In this study, the crustal structures …
Karstic Depressions On Bolkar Mountain Plateau, Central Taurus (Turkey):Distribution Characteristics And Tectonic Effect On Orientation, Muhammed Zeynel Öztürk, Mesut Şi̇mşek, Mustafa Utlu, Mehmet Furkan Şener
Karstic Depressions On Bolkar Mountain Plateau, Central Taurus (Turkey):Distribution Characteristics And Tectonic Effect On Orientation, Muhammed Zeynel Öztürk, Mesut Şi̇mşek, Mustafa Utlu, Mehmet Furkan Şener
Turkish Journal of Earth Sciences
This study investigates the spatial distribution characteristics of karstic depressions that developed on a 2558 km2 plateau with gently sloping in neritic (reef) limestones in the western section of the Bolkar Mountains. The 30,132 karstic depressions identified are located at elevations between 1315 and 2525 m, while 31°/km2 slope and 5.6 km/km2 drainage density are limited to the spatial distribution of depressions. In the central section of the study area at the anticlinal surface, maximum density (99 depressions/km2) is reached between elevations of 1930 and 2080 m. The orientation of depressions is predominantly NE-SW. However, in the same area, the …
The Physical And Physicochemical Properties Of Some Turkish Thermal Muds And Pure Clay Minerals And Their Uses In Therapy, Muazzez Çeli̇k Karakaya, Necati̇ Karakaya, Senar Aydin
The Physical And Physicochemical Properties Of Some Turkish Thermal Muds And Pure Clay Minerals And Their Uses In Therapy, Muazzez Çeli̇k Karakaya, Necati̇ Karakaya, Senar Aydin
Turkish Journal of Earth Sciences
The physical and physicochemical properties of thermal muds (peloids) from 20 spas in Turkey were defined and compared with those of naturally pure clay minerals, smectite, illite, sepiolite, and kaolinite, to define the suitability of their use in pastes, masks, creams, and/or mud baths. The liquid and plastic limit values of the peloids show medium to high plasticity. The values of the pure clay minerals vary from 110 to 369 and 60 to 130, respectively, being higher than those of the peloid samples except for illite and kaolinite. The peloid samples show very soft, soft, semihard, hard, and fluid properties …
Investigating Moho Depth, Curie Point, And Heat Flow Variations Of The Yozgat Batholith And Its Surrounding Area, North Central Anatolia,Turkey, Using Gravity And Magnetic Anomalies, Funda Bi̇li̇m
Turkish Journal of Earth Sciences
This paper proposes an interpretation of the Bouguer gravity and magnetic anomaly map of the Yozgat Batholith and its surrounding area (north central Anatolia) for determination of crustal and geothermal structures. In the study area, the Moho and Conrad depths based on a relationship between Bouguer gravity anomaly and seismically determined crustal thickness were estimated as 34-39 km and 19.5-21.5 km, respectively. The crustal thickness of the study area increases from west to east. The estimated Curie point depths in the study area by means of spectral analysis of the magnetic data vary between 10.4 and 19.5 km. The shallow …
Feather-Like Hornblende Aggregates In The Phyllites From The Southern Sanandaj-Sirjan Zone, Iran; Their Origin And Mode Of Formation, Hossein Fatehi, Hamid Ahmadipour, Nakashima Kuzuo, Hesamaddin Moeinzadeh
Feather-Like Hornblende Aggregates In The Phyllites From The Southern Sanandaj-Sirjan Zone, Iran; Their Origin And Mode Of Formation, Hossein Fatehi, Hamid Ahmadipour, Nakashima Kuzuo, Hesamaddin Moeinzadeh
Turkish Journal of Earth Sciences
Several outcrops of spectacular feather-like hornblende aggregates occur in the phyllites of the Gol-e-Gohar complex (southeast of Iran) and form special Garbenschiefer rock types. The Gol-e-Gohar complex, as a part of the southern Sanandaj-Sirjan metamorphic zone, contains a succession of metabasites, phyllites, and slates intruded by dioritic intrusions. There are two types of hornblendes in the phyllites; the first one is concentrated around the fractures and the second one is randomly distributed in the rocks and forms radial feather-like hornblende aggregates. Petrographical and chemical characteristics of these two shapes of hornblendes are the same, except the latter is developed parallel …
Improved Composition Of Hawaiian Basalt Bhvo-1 From The Application Of Two New And Three Conventional Recursive Discordancy Tests, Surendra P. Verma, Mauricio Rosales-Rivera, Lorena Díaz-González, Alfredo Quiroz-Ruiz
Improved Composition Of Hawaiian Basalt Bhvo-1 From The Application Of Two New And Three Conventional Recursive Discordancy Tests, Surendra P. Verma, Mauricio Rosales-Rivera, Lorena Díaz-González, Alfredo Quiroz-Ruiz
Turkish Journal of Earth Sciences
In order to establish the best statistical procedure for estimating improved compositional data in geochemical reference materials for quality control purposes, we evaluated the test performance criterion (πD C) and swamping (πswamp) and masking (πmask) effects of 30 conventional and 32 new discordancy tests for normal distributions from central tendency slippage δ = 2-10, number of contaminants E = 1-4, and sample sizes n = 10, 20, 30, 40, 60, and 80. Critical values or percentage points required for 44 test variants were generated through precise and accurate Monte Carlo simulations for sample sizes nmin(1)100. The recursive tests showed overall …
Depositional Stages Of The Eğribucak Inner Basin (Terrestrial To Marine Evaporite And Carbonate) From The Sivas Basin (Central Anatolia, Turkey), Özgen Kangal, Nazi̇re Erdem, Baki̇ Erdoğan Varol
Depositional Stages Of The Eğribucak Inner Basin (Terrestrial To Marine Evaporite And Carbonate) From The Sivas Basin (Central Anatolia, Turkey), Özgen Kangal, Nazi̇re Erdem, Baki̇ Erdoğan Varol
Turkish Journal of Earth Sciences
The Sivas Cenozoic Basin and coeval Central Anatolian basins such as Çankırı and Tuz Gölü are characterized by both marine and terrestrial sediments ranging in age from the Eocene to early Miocene. The evaporite regime here generally appeared during the late stage of Eocene transgression and persisted through the Oligocene time. However, marine-induced Oligocene evaporites are less known because of less paleontological evidence and regional tectonics and salt diapirism that mostly caused the destruction of their original stratigraphic positions. The Eğribucak area studied here, located about 25 km southeast of Sivas, provides a well-stratified key section to shed light on …
Terrestrial-Marine Sedimentary Cycles In The South Yellow Sea, China: Implications For Paleoenvironmental Reconstruction Since Mis 5, Liangtao Ye, Ge Yu, Mengna Liao, Shouyun Hu, Longsheng Wang, Lei Gao
Terrestrial-Marine Sedimentary Cycles In The South Yellow Sea, China: Implications For Paleoenvironmental Reconstruction Since Mis 5, Liangtao Ye, Ge Yu, Mengna Liao, Shouyun Hu, Longsheng Wang, Lei Gao
Turkish Journal of Earth Sciences
Sedimentary records of the continental shelves since Marine Isotope Stage (MIS) 5 are valuable for paleoenvironmental reconstruction and decipherment of land-sea interactions. Since the 1990s, different perspectives on global glacioclimate magnitudes and the associated evolution of major sedimentary environments during the Late Pleistocene have caused a distinctive understanding of marine transgressions and coastal deposits during MIS 3 and MIS 5. Moreover, the chronology of sediment sequences from this region was primarily determined based on radiocarbon dating, which might be problematic for deposits of 40-50 ka BP or older. In this study, we used both a 150-m-long sedimentary core (YZ07) as …
Diluted Magnetic Semiconductor: Structure, Size And Shape, And Magnetic Properties, Muhammet Arucu
Diluted Magnetic Semiconductor: Structure, Size And Shape, And Magnetic Properties, Muhammet Arucu
Turkish Journal of Physics
In dilute magnetic metallic alloys, spin exchange interactions among transition metal ions at the ZnO structure cause changes in the magnetic properties of the nanocrystals depending on size and shape. The effect of size and shape on the structural and magnetic properties of semiconductors, using atomistic spin calculations, is the main topic of this study. When the size of the system decreases to a few nanometers, stability is not observed as a result of the large size. We theoretically examine the magnetic properties of CoZnO materials according to size and shape effects using the Monte Carlo method and the Heisenberg …
Triangular Quantum Profiles: Transmission Probability And Energy Spectrum, Altuğ Arda
Triangular Quantum Profiles: Transmission Probability And Energy Spectrum, Altuğ Arda
Turkish Journal of Physics
Analytical expressions for the transition probability and the energy spectrum of the 1D Schrödinger equation with position-dependent mass are presented for the triangular quantum barrier and quantum well. The transmission coefficient is obtained by using the wave functions written in terms of Airy's functions and of the solutions of Kummer's differential equation. In order to show the validity of our analysis, an example by taking some numerical values for a GaAs heterostructure is presented.
Investigation Of Low-Lying Magnetic Dipole Excitations In The $^{153}$Eu Nucleus, Emre Tabar
Investigation Of Low-Lying Magnetic Dipole Excitations In The $^{153}$Eu Nucleus, Emre Tabar
Turkish Journal of Physics
The properties of low-lying magnetic dipole ($M$1) excitations in $^{153}$Eu were studied within a rotational invariant quasiparticle phonon model that takes into account the symmetry-restoring as well as spin-spin residual forces. The calculations show that there are purely collective $M$1 excitations lying at 2-4 MeV fragmented over orbital 1$^{+}$ states of the $^{152}$Sm core nucleus. The results were compared to the experimentally known $M$1 excitations at 2-3 MeV. A reasonably good agreement in the total transition strength, the centroid energy, and the resonance width was obtained.