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Production Of (S)-(-)-1-(1´-Napthyl) Ethanol By Rhodotorula Glutinis Isolate Using Ram Horn Peptone, Esabi̇ Başaran Kurbanoğlu, Kani̇ Zi̇lbeyaz, Namudar I. Kurbanoğlu, Mesut Taşkin, Hamdullah Kiliç
Production Of (S)-(-)-1-(1´-Napthyl) Ethanol By Rhodotorula Glutinis Isolate Using Ram Horn Peptone, Esabi̇ Başaran Kurbanoğlu, Kani̇ Zi̇lbeyaz, Namudar I. Kurbanoğlu, Mesut Taşkin, Hamdullah Kiliç
Turkish Journal of Chemistry
The bioreduction of 1-acetonaphthone 1 by locally isolated Rhodotorula glutinis strains using ram horn peptone (RHP) gave (S)-(-)-1-(1´-naphthyl) ethanol (2), an important pharmaceutical intermediate. R. glutinis strains were isolated from the water of fermented Salix leaves. Optimum fermentation conditions for the production of 2 were 200 rpm, 32 °C, and pH 6.5. The production of 2 with excellent enantiomeric excess (>99%), and good conversion (100%) and yield (78%) under optimum conditions was achieved up to preparative scale via a fermenter. Wide temperature, pH, time, and agitation ranges did not affect the enantiomeric excess (ee) of the bioreduction product. A …
High Yielding Oxidative Deprotection Of Silyl And Pyranyl Ethers To Their Corresponding Carbonyl Compounds With Strontium Manganate In The Presence Of Aluminium Chloride In Solution And Under Solvent-Free Conditions, Mostafa Gholizadeh, I. Mohmmadpoor Baltork
High Yielding Oxidative Deprotection Of Silyl And Pyranyl Ethers To Their Corresponding Carbonyl Compounds With Strontium Manganate In The Presence Of Aluminium Chloride In Solution And Under Solvent-Free Conditions, Mostafa Gholizadeh, I. Mohmmadpoor Baltork
Turkish Journal of Chemistry
Strontium manganate (SrMnO_4) in the presence of aluminium chloride (AlCl_3) is an efficient reagent for the high yielding oxidative deprotection of aromatic and aliphatic silyl and pyranyl ethers into their corresponding carbonyl compounds, in solution and under solvent-free conditions.
Preparation Of Palladium Composite Membranes On Pore Structure Modified And Non-Modified Supports By Electroless Plating Procedure, Sali̇ha Kiliçarslan, Osman Muzaffer Afyon, Meltem Doğan
Preparation Of Palladium Composite Membranes On Pore Structure Modified And Non-Modified Supports By Electroless Plating Procedure, Sali̇ha Kiliçarslan, Osman Muzaffer Afyon, Meltem Doğan
Turkish Journal of Chemistry
The effects of pore structure of the support on the plating morphology, thickness, and composition were investigated in an electroless plating procedure. Some of the plating studies were carried out directly on commercially available porous glass supports, while others were performed on modified supports. Two modification steps with alumina were applied on tubular supports. Formation of a 60-\mu m-thick layer on the modified support was detected by SEM analysis after the first 2 plating steps, while layer formation was not observed on the non-modified support. It was shown that the formation of a new layer started on the modified support, …
Examination Of The Electroanalytic Performance Of Carbon Nanotube (Cnt) Modified Carbon Paste Electrodes As Xanthine Biosensor Transducers, Ülkü Anik, Meli̇ha Çubukçu
Examination Of The Electroanalytic Performance Of Carbon Nanotube (Cnt) Modified Carbon Paste Electrodes As Xanthine Biosensor Transducers, Ülkü Anik, Meli̇ha Çubukçu
Turkish Journal of Chemistry
The effect of multi-walled carbon nanotube (MWCNT) and single-wall carbon nanotube (SWCNT) on carbon paste electrode (CPE) electrochemical response was examined by introducing various portions of CNT into the CPE. The optimum electrode structure was determined by comparing the prepared electrodes´ electroanalytical performance towards ferricyanide. Then these optimum compositions were modified with xanthine oxidase (XO) enzyme for obtaining a xanthine biosensor. After the optimization of biosensor working conditions, the developed systems were characterized for xanthine. Linearity was obtained in the concentration range between 1 and 100 \mu M xanthine with an RSD value of 3.35% for MWCNT-CPE, while with SWCNT-CPE …
Potentiometric Determination Of The Stability Constants Of Lanthanide Complexes With Iminodiacetic Acid In Water And Dioxane-Water Mixtures, Sevgi̇ Arzik, Ebru Mavi̇oğlu Ayan, A. Sedat Çelebi̇
Potentiometric Determination Of The Stability Constants Of Lanthanide Complexes With Iminodiacetic Acid In Water And Dioxane-Water Mixtures, Sevgi̇ Arzik, Ebru Mavi̇oğlu Ayan, A. Sedat Çelebi̇
Turkish Journal of Chemistry
The protonation constants of iminodiacetic acid (H_2 ida) and the stability constants of its complexes with Nd(III), Sm(III), Gd(III), Dy(III), and Er(III) ions at metal/ligand mole ratios of 1:1, 1:2, and 1:3 at 25 °C and 0.1 M ionic strength in aqueous medium and 20%, 45%, and 70% w/w dioxane-water mixtures were determined by the potentiometric method using the BEST computer program. The stability constants of the complexes that formed increased as the dioxane content increased. The stability of all the analogues' complexes, both in aqueous medium and in dioxane-water mixtures, were in the order of Nd(III) < Sm(III) < Gd(III) < Dy(III) < Er(III).
Synthesis And Characterization Of New Tridentate Iminooxime Ligands And Their Co(Iii) Complexes, Hasene Mutlu, Gazi̇ İrez
Synthesis And Characterization Of New Tridentate Iminooxime Ligands And Their Co(Iii) Complexes, Hasene Mutlu, Gazi̇ İrez
Turkish Journal of Chemistry
In this study, (hydroxyimino)(2-phenyl(1,2,3,4-tetrahydroquinazolin- 2-yl))methane (H_2L^1) and (hydroxyimino)(2-(2-thienyl)(1,2,3,4- tetrahydroquinazolin-2-yl))methane (H_2L^2) were synthesized by the condensation of 2-(hydroxyimino)-1-phenylethan-1-one (INAP) and 2-(hydroxyimino)-1-(2-thienyl)ethan-1-one (INAT) with 2-aminobenzylamine (2-ABA). Complexes of these ligands with Co^{3+} were prepared with a metal:ligand ratio of 1:2. The ligands and their complexes were elucidated on the basis of elemental analyses, AAS, FT-IR, ^1H- and ^{13}C-NMR spectra, mass spectra, magnetic susceptibility measurements, and molar conductivity.
Comparison Of Catalytic Activities Of Carbon Supported Pt And Pt-Ru Catalysts For Methanol Oxidation In Neutral And Basic Media By Cyclic Voltammetry, Abdul Sattar Ali Khan, Riaz Ahmed, Muhammad Latif Mirza
Comparison Of Catalytic Activities Of Carbon Supported Pt And Pt-Ru Catalysts For Methanol Oxidation In Neutral And Basic Media By Cyclic Voltammetry, Abdul Sattar Ali Khan, Riaz Ahmed, Muhammad Latif Mirza
Turkish Journal of Chemistry
The catalytic activities of an equal amount of 3 different carbon supported catalysts containing 10% Pt, 20% Pt + 10% Ru, and 30% Pt were evaluated in neutral and basic media for methanol oxidation by cyclic voltammetry. The prominent oxidation peak for methanol appeared in the forward anodic sweep at around 1.0 V in neutral medium, while in basic medium it appeared at significantly lower potential close to 0.2 V. The peak current for methanol oxidation was higher on a catalyst containing higher Pt loading. The comparison of polarization behavior of 20% Pt + 10% Ru and 30% Pt catalysts …
Synthesis And Biological Activity Of Allosteric Modulators Of Gaba_B Receptors. Part 4. Synthesis Of Potentially Fluorescent Acridines And Conformationally Restricted N-(Arylpropyl)-1-Arylethylamines, Jabbar Khalafy, Rolf H. Prager, Ni Made Puspawati
Synthesis And Biological Activity Of Allosteric Modulators Of Gaba_B Receptors. Part 4. Synthesis Of Potentially Fluorescent Acridines And Conformationally Restricted N-(Arylpropyl)-1-Arylethylamines, Jabbar Khalafy, Rolf H. Prager, Ni Made Puspawati
Turkish Journal of Chemistry
A series of 8 new derivatives of fendiline was prepared for evaluation as allosteric modulators of GABA_B receptors: 4 based on acridine and 4 with restricted distance between the 2 aryl moieties.
Synthesis And Cloning Of A Small Bacillus Pheromone Gene (Comx_{Ro-B-2}) By Primer-Dimer Formation With Pcr, Devri̇m Demi̇r Dora, Tanil Kocagöz, Fi̇li̇z Öner
Synthesis And Cloning Of A Small Bacillus Pheromone Gene (Comx_{Ro-B-2}) By Primer-Dimer Formation With Pcr, Devri̇m Demi̇r Dora, Tanil Kocagöz, Fi̇li̇z Öner
Turkish Journal of Chemistry
ComX pheromone is the major extracellular signaling peptide stimulating transformation in response to high cell density in Bacillus species. In this study, Bacillus mojavensis ComX_{(RO-B-2)} pheromone gene was cloned to pGEMT-Easy vector based on TA cloning of PCR products. The gene encoding 11 amino acid peptides of Bacillus mojavensis RO-B-2 strain ComX pheromone (GLQIYTNWVPS) was obtained by PCR amplification of 2 primers complementary to each other at their 3' end. This eliminated the need for the original bacterial gene as DNA template for PCR. The amplified PCR products were ligated directly without any modification by T4 DNA ligase into pGEMT-Easy …
Preparation, Characterization, And Potentiometric Titrations Of Some New Di-[3-(3-Alkyl/Aryl-4,5-Dihydro-1h-1,2,4-Triazol-5-One-4-Yl)-Azomethinphenyl] Isophthalate/Terephthalate Derivatives, Haydar Yüksek, Özlem Gürsoy Kol
Preparation, Characterization, And Potentiometric Titrations Of Some New Di-[3-(3-Alkyl/Aryl-4,5-Dihydro-1h-1,2,4-Triazol-5-One-4-Yl)-Azomethinphenyl] Isophthalate/Terephthalate Derivatives, Haydar Yüksek, Özlem Gürsoy Kol
Turkish Journal of Chemistry
3-Alkyl(Aryl)-4-amino-4,5-dihydro-1H-1,2,4-triazol-5-ones (2) reacted with di-(3-formylphenyl) isophthalate (3) and di-(3-formylphenyl) terephthalate (6) to afford the corresponding 6 novel di-[3-(3-alkyl/aryl-4,5-dihydro-1H-1,2,4-triazol-5-one-4-yl)- azomethinphenyl] isophthalates (4) and 6 novel di-[3-(3-alkyl/aryl-4,5- dihydro-1H-1,2,4-triazol-5-one-4-yl)-azomethinphenyl] terephthalates (7), respectively. The acetylation reactions of compounds 4 and 7 were investigated, and 5 and 8 type compounds were obtained, respectively. The new compounds synthesized were characterized by using IR, ^1H-NMR, ^{13}C-NMR, and UV spectral data together with elemental analysis. In addition, to investigate the effects of solvents and molecular structure upon acidity, compounds 4 and 7 were titrated potentiometrically with tetrabutylammonium hydroxide in 5 non-aqueous solvents (isopropyl alcohol, tert-butyl alcohol, N,N-dimethylformamide, acetone, …
Microwave-Assisted Synthesis Of 1,4´-Diazaflavone And N-Alkyl Derivative Pigments With Anti-Microbial Activity, Nuran Yayli, Osman Üçüncü, Nuretti̇n Yayli, Emi̇ne Demi̇r, Zi̇hni̇ Demi̇rbağ
Microwave-Assisted Synthesis Of 1,4´-Diazaflavone And N-Alkyl Derivative Pigments With Anti-Microbial Activity, Nuran Yayli, Osman Üçüncü, Nuretti̇n Yayli, Emi̇ne Demi̇r, Zi̇hni̇ Demi̇rbağ
Turkish Journal of Chemistry
1,4'-Diazaflavone pigment (2) was synthesized by a simple environmentally friendly microwave-assisted one-pot method for the cyclization of 2'-amino (E)-4''-aza-chalcone (1) under solventless conditions using K-10 clay. In addition, 10 new N-alkyl (C_{5-12, 14-15}) substituted 1,4' -diazaflavonium bromide pigments (3-12) were prepared from compound 2 or directly from compound 1, with corresponding alkyl halides in acetonitrile under reflux. The anti-microbial activity of compounds 1-12 was tested. The N-alkyl substituted 1,4' -diazaflavonium bromides (3-12) showed good antimicrobial activity against the gram-positive bacteria tested with minimal bactericidal concentration (MBC) values for the reference antibiotic kanamycin. The optimum length of the alkyl chain for …
A Novel Theoretical Procedure To Determine Absorption And Gain Coefficients In A Symmetric Single Step-Index Quantum Well Laser, Mustafa Temi̇z, Özgür Önder Karakilinç, Mehmet Ünal
A Novel Theoretical Procedure To Determine Absorption And Gain Coefficients In A Symmetric Single Step-Index Quantum Well Laser, Mustafa Temi̇z, Özgür Önder Karakilinç, Mehmet Ünal
Turkish Journal of Electrical Engineering and Computer Sciences
If the indices n_{II}, n_{I,III} of the regions, the thickness 2a of the active region (AR) and the wavelength \lambda for a single symmetric step-index quantum well laser (SSSIQWL) are given, the normalized propagation constant (NPC) \alpha is obtained. In this novel method, absorption and gain coefficients for the SSSIQWL have been obtained in terms of the NPCs \alpha in the even and odd fields, directly.
Evolutionary Algorithms For The Unit Commitment Problem, A. Şi̇ma Uyar, Belgi̇n Türkay
Evolutionary Algorithms For The Unit Commitment Problem, A. Şi̇ma Uyar, Belgi̇n Türkay
Turkish Journal of Electrical Engineering and Computer Sciences
This paper compares three evolutionary computation techniques, namely Steady-State Genetic Algorithms, Evolutionary Strategies and Differential Evolution for the Unit Commitment Problem. The comparison is based on a set of experiments conducted on benchmark datasets as well as on real-world data obtained from the Turkish Interconnected Power System. The results of two state-of-the-art evolutionary approaches, namely a Generational Genetic Algorithm and a Memetic Algorithm for the same benchmark datasets are also included in the paper for comparison. The tests show that Differential Evolution is the best performer among all approaches on the test data used in the paper. The performances of …
The Earthquake Catalogues For Turkey, Onur Tan, M. Cengi̇z Tapirdamaz, Ahmet Yörük
The Earthquake Catalogues For Turkey, Onur Tan, M. Cengi̇z Tapirdamaz, Ahmet Yörük
Turkish Journal of Earth Sciences
The earthquake data from instrumental records in the last 40 years indicate the general seismicity of the earth. However, examining historical records is necessary to understand long-term seismicity. Catalogue studies about historical earthquakes in Turkey are limited. All these catalogues are on printed paper and a digital database has not yet been prepared. On the other hand, there is no common database for the focal mechanism solutions of the recent destructive earthquakes (Mw>=5.5) in the region. The present study aims to prepare two new digital databases for earth scientists so that the earthquake parameters can be reached from a …
Post-Miocene Deformation In The South Of The Galatean Volcanic Province, Nw Of Central Anatolia (Turkey), Bora Rojay, A. Karaca
Post-Miocene Deformation In The South Of The Galatean Volcanic Province, Nw Of Central Anatolia (Turkey), Bora Rojay, A. Karaca
Turkish Journal of Earth Sciences
Central Anatolia, located on the immense Alpine-Himalayan orogenic belt, has a complicated neotectonic evolution, and NE-SW-trending Neogene horsts-graben systems that rejuvenate pre-existing palaeostructures are among the most important structures which help us understand the tectonic evolution of Central Anatolia. Post-Miocene deformational studies were carried out in Miocene-Quaternary sequences situated at the southeastern margin of the Galatean Volcanic Province (NW of Central Anatolia, Turkey) in order to understand the deformational history of Central Anatolia. The structural analyses were based on bedding attitude data and fault plane slip data. Fold analysis in Miocene units gave an asymmetrical fold axis trending 046ºN. Although …
Punctuated Exhumation And Foreland Basin Formation And Infilling In (Circum)-Central Anatolia (Turkey) Associated With The Neo-Tethyan Closure, Durmuş Boztuğ, Haluk Temi̇z, Raymond Jonckheere, Lothar Ratscbacher
Punctuated Exhumation And Foreland Basin Formation And Infilling In (Circum)-Central Anatolia (Turkey) Associated With The Neo-Tethyan Closure, Durmuş Boztuğ, Haluk Temi̇z, Raymond Jonckheere, Lothar Ratscbacher
Turkish Journal of Earth Sciences
Apatite fission-track data indicate that the (circum)-central Anatolian granitoids (CAG) were exhumed during successive shortening phases following continent-continent collisions within the Neo-Tethyan domain in central and east-central Anatolia. The Early to Middle Paleocene exhumation of the CAG is thought to be a consequence of the collision between the Tauride-Anatolide platform (TAP) and the Eurasian plate (EP) following the consumption of the İzmir-Ankara-Erzincan strand of the northern Neo-Tethys. The Oligocene exhumation documented by the data for the Kösedağ pluton in east-central Anatolia is considered to be related to the compression due to continuing convergence between the EP and TAP which seems …
Textural And Compositional Evidence For Magma Mixing In The Evolution Of The Çamlıdere Volcanic Rocks (Galatean Volcanic Province), Central Anatolia, Turkey, Eli̇f Varol, Abi̇di̇n Temel, Alain Gourgaud
Textural And Compositional Evidence For Magma Mixing In The Evolution Of The Çamlıdere Volcanic Rocks (Galatean Volcanic Province), Central Anatolia, Turkey, Eli̇f Varol, Abi̇di̇n Temel, Alain Gourgaud
Turkish Journal of Earth Sciences
The Çamlıdere area, in the Galatean Volcanic Province (Ankara), Turkey, is composed of rhyolitic, andesitic, trachytic, dacitic and locally basaltic rocks. The older volcanic rocks in the studied area are rhyolitic and the younger ones basaltic. The phenocrysts from all the volcanic rocks exhibit some petrographic disequilibrium features such as: (a) coexistence of reversely, normally and oscillatory zoned sieved or unsieved plagioclase in the same rock; (b) wide compositional variation of An% in feldspar phenocrysts; (c) sieved, unsieved, normally and reversely zoned pyroxenes occur together in a single rock; (d) some orthopyroxene phenocrysts are surrounded by clinopyroxene; (e) reaction textures, …
Statistical Earthquake Frequency Analysis For Western Anatolia, Esi̇n Fi̇ruzan
Statistical Earthquake Frequency Analysis For Western Anatolia, Esi̇n Fi̇ruzan
Turkish Journal of Earth Sciences
In order to apply a statistical earthquake frequency analysis to western Anatolia, the area has been restricted within coordinates 36.50º-40º North and 26.00º-30.00º East. Data used in the analysis belong to the instrumental period from 1.1.1900 to 10.11.2006 (Ms ≥ 4.0). The earthquake record was assumed to be representative of longer periods and the possibility of clusters of seismicity or of extreme magnitude events were ignored. The study area has been divided into eight zones with different seismotectonic properties. All computations have been performed for these zones separately. The earthquake magnitude series is termed as the instantaneous peak over the …
Quaternary Calcrete Development In The Mersin Area, Southern Turkey, Muhsi̇n Eren, Selahatti̇n Kadi̇r, Zübeyde Hati̇poğlu, Murat Gül
Quaternary Calcrete Development In The Mersin Area, Southern Turkey, Muhsi̇n Eren, Selahatti̇n Kadi̇r, Zübeyde Hati̇poğlu, Murat Gül
Turkish Journal of Earth Sciences
Quaternary calcretes are widespread in the Mersin area and occur in a variety of forms. Several distinct calcrete profiles are recognized and subdivided into two major groups defined by mature and immature profiles. Mature calcrete profiles comprise a generally isolated calcrete horizon at the base and hard laminated crust at the top with rarely pisolithic crust in the uppermost part. The immature calcrete profiles consist mainly of an isolated calcrete horizon which is rarely overlain by a laminated crust. Calcrete forms show three main stages of development: (i) a mottled or plugged horizon, comprising isolated calcrete forms such as powdery, …
Relative Sea-Level Changes Of The Lower Cretaceous Deposits In The Chotts Area Of Southern Tunisia, Lazzez Marzouk, Mohamed Ben Youssef
Relative Sea-Level Changes Of The Lower Cretaceous Deposits In The Chotts Area Of Southern Tunisia, Lazzez Marzouk, Mohamed Ben Youssef
Turkish Journal of Earth Sciences
A transition facies between evaporate and clay, carbonate and siliciclastic deposits occurs within the Lower Cretaceous of Southern Tunisia. The sedimentary deposits comprise four major transgressive-regressive sedimentary sequences with distinctive sabkha, tidal to shallow carbonate marine platform, and mixed siliciclastic ramp environments. Sedimentation rates, as well as thickness and facies changes were controlled by tectonic, climatic and eustatic factors. Transgression pulses encompassing the whole Late Hauterivian-Barremian, Early Aptian and Late Albian have controlled the basin infill. Evaporate and siliciclastic systems pass gradually to carbonate deposition in the Chotts area. Our sedimentation model helps to decipher the roles of tectonics and, …
Effects Of Opacity On Stellar Radii And Their Relevance To Observational Data, Gülay İnlek, Aysun Böke, Oktay Yilmaz, Edwin Budding
Effects Of Opacity On Stellar Radii And Their Relevance To Observational Data, Gülay İnlek, Aysun Böke, Oktay Yilmaz, Edwin Budding
Turkish Journal of Physics
We have examined the effect of varying opacities on envelope structure with the aid of Paczynski's public domain stellar modelling programs. For this, we prepared new opacity tables from the data of Kurucz [1], using Lagrange interpolation to obtain the tabular values. We compare the results of these Kurucz opacities with similar tabulations from Huebner et al. [2], Iglesias and Rogers [3], Rogers and Iglesias [4] and Iglesias and Rogers [5]. We have checked calculations for the same ranges of stars considered originally by Schwarzschild [6], and compared our findings, using newer opacity data, with those of other sources. We …
Emc Effect Using Thermodynamical Bag Model, Kuppusamy Ganesamurthy, Raghavan Sambasivam
Emc Effect Using Thermodynamical Bag Model, Kuppusamy Ganesamurthy, Raghavan Sambasivam
Turkish Journal of Physics
The nuclear EMC effect has been evaluated in the entire range of Bjorken variable x for the value of Q^2 = 5 GeV^2 using the phenomenological model known as the Thermodynamical bag model (TBM) and the results have been compared with the experimental values obtained in the deep inelastic scattering by SLAC and BCDMS. Also the values of structure function ratio are obtained as a function of Nachtmann variable \xi , which is used to represent the quark momentum in the Bjorken limit.
Theoretical Study Of Electronic Properties Of The Semi-Conductors Aln And Gan With The Empirical Pseudopotential Method Epm, Kaddour Bencherif, Mohamed Sehil, Hamza Abid, Mohamed Elhadi Louhibi
Theoretical Study Of Electronic Properties Of The Semi-Conductors Aln And Gan With The Empirical Pseudopotential Method Epm, Kaddour Bencherif, Mohamed Sehil, Hamza Abid, Mohamed Elhadi Louhibi
Turkish Journal of Physics
The electronic structure of binary compounds AlN and GaN are presented. We have used the empirical pseudo-potential method. Good agreement between the calculated results and experiment is obtained. The charge densities are presented for the sum of the four valence bands of both AlN and GaN.
Superconducting State Parameters Of Be-Zr Glassy Alloys, Aditya M. Vora
Superconducting State Parameters Of Be-Zr Glassy Alloys, Aditya M. Vora
Turkish Journal of Physics
The theoretical investigation of the superconducting state parameters (SSP) viz. electron-phonon coupling strength \lambda , Coulomb pseudopotential \mu*, transition temperature T_C , isotope effect exponent \alpha and effective interaction strength N_O V of Be_c Zr_{1-c} (c= 0.30, 0.35, 0.40 and 0.45) metallic glasses have been reported using Ashcroft's empty core (EMC) model potential for the first time. Five local field correction functions proposed by Hartree (H), Taylor (T), Ichimaru-Utsumi (IU), Farid et al. (F) and Sarkar et al. (S) are used in the present investigation to study the screening influence on the aforesaid properties. It is observed that the electron-phonon …
Optical And Structural Properties Of The Gas_Xse_{1-X}, Gase, Tlgase_2 And Tlins_2 Semiconductors, Aydin Ulubey Kulibekov
Optical And Structural Properties Of The Gas_Xse_{1-X}, Gase, Tlgase_2 And Tlins_2 Semiconductors, Aydin Ulubey Kulibekov
Turkish Journal of Physics
In the present work, crystal structure and optical properties of the layered chalcogenides GaS_xSe_{1-x}, GaSe, TlGaSe_2 and TlInS_2 were investigated in the visible (VIS) and infrared (IR) range of spectra. Partial content of the elements were performed and the space group were determined by help of X-ray diffraction experiments. Making use of the experimental results, we have constructed a scheme of band motion for the transition from GaSe to GaS. It has been established that that the infrared active optical modes show typical two-mode behaviour. DOI: 10.1007/s10762-005-0294-3, 10.1063/1.2128694
Calculated Pressure Induced Bcc-Fcc Phase Transitions In Alkali Metals, Hamdi̇ Dağistanli, Riza Haluk Mutlu
Calculated Pressure Induced Bcc-Fcc Phase Transitions In Alkali Metals, Hamdi̇ Dağistanli, Riza Haluk Mutlu
Turkish Journal of Physics
The partial occupation numbers and density of states (DOS), and the total DOS at the Fermi level are calculated as a function of reduced atomic volume for bcc and fcc alkali metals employing the linear-muffin-tin-orbital (LMTO) method. By means of the abrupt changes obtained in the partial and total DOS values at the Fermi level, good agreement with regard to experiment were found in predicting the bcc-fcc transition volumes of the alkali metals.
Nonlinear Process Between Co-Propagating Signal And Control Pulses In Semiconductor Optical Amplifiers, Jianwei Wu, Hai-Bo Bao
Nonlinear Process Between Co-Propagating Signal And Control Pulses In Semiconductor Optical Amplifiers, Jianwei Wu, Hai-Bo Bao
Turkish Journal of Physics
A nonlinear process between co-propagating signal and control pulses has been proposed and demonstrated numerically, based on semiconductor optical amplifiers (SOA). Results show that a Gaussian signal pulse with picosecond duration can be simultaneously amplified and compressed in a SOA by utilizing a co-propagating high-intensity control pulse. To obtain high quality signal pulse with high peak power level and short pulse width, the center carrier wavelengths of two pulses should locate in the gain region of the SOA. The initial delay time between both pulses should be tuned suitably before entering the SOA.