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Articles 6031 - 6060 of 10319
Full-Text Articles in Physical Sciences and Mathematics
Experimental Investigation Of Drag Reduction Effects Of Polymer Additives On Turbulent Pipe Flow Using Ultrasound Doppler Velocimetry, Şeri̇fe Zeybek Vural, Göknur Bayram, Yusuf Uludağ
Experimental Investigation Of Drag Reduction Effects Of Polymer Additives On Turbulent Pipe Flow Using Ultrasound Doppler Velocimetry, Şeri̇fe Zeybek Vural, Göknur Bayram, Yusuf Uludağ
Turkish Journal of Chemistry
Drag reduction in fully developed turbulent pipe flow with 4 concentrations (200 to 500 wppm or mg/kg) of low molecular weight sodium carboxymethylcellulose (CMC) in aqueous solutions was investigated experimentally. Drag reduction was determined by pressure drop measurements. Maximum drag reduction achieved was 22% using 500 wppm CMC solution. To observe the impact of the presence of CMC on the flow, ultrasound Doppler velocimetry (UDV) was employed to monitor the instantaneous velocity distributions. Experimental measurements were used to calculate Fanning friction factor and radial distributions of the axial time-averaged velocity, velocity fluctuation (turbulent intensity), and eddy viscosity. Two impacts of …
Synthesis And Antimicrobial Activity Of Novel 2-[4-(1h-Benzimidazol-1-Yl)Phenyl]-1h-Benzimidazoles, Mehmet Alp, Ali̇ Hakan Göker, Nurten Altanlar
Synthesis And Antimicrobial Activity Of Novel 2-[4-(1h-Benzimidazol-1-Yl)Phenyl]-1h-Benzimidazoles, Mehmet Alp, Ali̇ Hakan Göker, Nurten Altanlar
Turkish Journal of Chemistry
A new class of 2-[4-(1H-benzimidazol-1-yl)phenyl]-1H-benzimidazoles (13--22) were synthesized via cyclocondensation reaction of the substituted 1,2-phenylenediamines (1, 4--12) and 1-(4-formylpheny)-1H-benzimidazole (3). The synthesized compounds were evaluated for antibacterial and antifungal activities against S. aureus, methicillin-resistant Staphylococcus aureus (MRSA), and Candida albicans by the tube dilution method. Compounds 13, 15, 18, 20, and 21 have moderate antifungal activity against C. albicans.
Preparation Of A Novel Solid Acid Catalyst With Lewis And Brønsted Acid Sites And Its Application In Acetalization, Yijun Du, Linjun Shao, Lingyan Luo, Si Shi, Chenze Qi
Preparation Of A Novel Solid Acid Catalyst With Lewis And Brønsted Acid Sites And Its Application In Acetalization, Yijun Du, Linjun Shao, Lingyan Luo, Si Shi, Chenze Qi
Turkish Journal of Chemistry
A novel melamine--formaldehyde resin (MFR) supported solid acid with Lewis and Brønsted acid sites was synthesized through the immobilization of acidic ionic liquid and cuprous ion on MFR. The scanning electron microscopy (SEM) characterization showed that addition of PEG-2000 in the synthesis of MFR could promote the formation of regular particles with diameters around 3.7 \mu m. The XRD pattern demonstrated that some cuprous ions were aggregated. The catalytic performance of this acid catalyst was evaluated by acetalization. The results showed that the catalytic activity of MFR with Brønsted acid could be improved by addition of Lewis acid. The solid …
Self-Condensation Reactions Of Acyl Phosphonates: Synthesis Of Tertiary O-Protected \Alpha-Hydroxyphosphonates, Serkan Eymur, Mehmet Göllü, Ayhan Sitki Demi̇r
Self-Condensation Reactions Of Acyl Phosphonates: Synthesis Of Tertiary O-Protected \Alpha-Hydroxyphosphonates, Serkan Eymur, Mehmet Göllü, Ayhan Sitki Demi̇r
Turkish Journal of Chemistry
The self-condensation reaction of benzoyl dialkyl phosphonates was developed using cyanide ion as catalyst, affording versatile tertiary O-protected \alpha-hydroxy phosphonates in moderate yield.
Speciation Of Chromium By The Combination Of Dispersive Liquid--Liquid Microextraction And Microsample Injection Flame Atomic Absorption Spectrometry, Yunusemre Ünsal, Mustafa Tüzen, Mustafa Soylak
Speciation Of Chromium By The Combination Of Dispersive Liquid--Liquid Microextraction And Microsample Injection Flame Atomic Absorption Spectrometry, Yunusemre Ünsal, Mustafa Tüzen, Mustafa Soylak
Turkish Journal of Chemistry
A microextraction procedure was established for the speciation of total Cr, Cr(III), and Cr(VI). Sudan blue II was used as a ligand for speciation works. Some factors affecting the recoveries of chromium species, including type of extraction and dispersive solvents, pH, ligand amount, extraction time, and matrix ions, were examined. Optimum values for the dispersive liquid--liquid microextraction method were pH 6, LOD 0.34 \mu g L^{-1}, and preconcentration factor 400. Chromium(III) was quantitatively recovered under optimal conditions, while the recovery of chromium(VI) was below 10%. The relative standard deviation for Cr(III) determinations for the 10-replicate measurement of 0.3 \mu g …
Preparation Of A Lead Sensor Based On Porous Multiwalled Carbon Nanotubes/Thiolated Chitosan Composite Materials, Jun Wan, Ling Xing, Wei Wang
Preparation Of A Lead Sensor Based On Porous Multiwalled Carbon Nanotubes/Thiolated Chitosan Composite Materials, Jun Wan, Ling Xing, Wei Wang
Turkish Journal of Chemistry
Thiolated chitosan (CS--TGA) was prepared using chitosan (CS) and thioglycolic acid (TGA). Then MWCNTs were added to the mixture of CS--TGA and CS to prepare the CS/CS--TGA/MWCNs porous composite by freeze-drying method and this composite was used to modify an indium tin oxide glass electrode. The electrode was used as a sensor for Pb^{2+}. The morphology and structure of the composite were characterized by infrared spectroscopy and scanning electron microscope, and their electrochemical behavior was also studied. Under the optimized experimental conditions, the sensor showed a linear range of 2.0 \times 10^{-9}\sim 2.0 \times 10^{-8} mol L^{-1} for Pb^{2+} with …
Synthesis And X-Ray Powder Diffraction, Electrochemical, And Genotoxic Properties Of A New Azo-Schiff Base And Its Metal Complexes, Mustafa Bal, Gökhan Ceyhan, Bariş Avar, Muhammet Köse, Ahmet Kayraldiz, Mükerrem Kurtoğlu
Synthesis And X-Ray Powder Diffraction, Electrochemical, And Genotoxic Properties Of A New Azo-Schiff Base And Its Metal Complexes, Mustafa Bal, Gökhan Ceyhan, Bariş Avar, Muhammet Köse, Ahmet Kayraldiz, Mükerrem Kurtoğlu
Turkish Journal of Chemistry
A new, substituted 2-[(E)-{[4-(benzyloxy)phenyl]imino} methyl]-4-[(E)-(4-nitrophenyl)diazenyl]phenol azo-azomethine ligand (mbH) was synthesized from 2-hydroxy-5-[(4-nitrophenyl)diazenyl]benzaldehyde and 4-benzyloxyanilinehydrochloride in ethyl alcohol solution. These mononuclear Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) complexes of the ligand were prepared and their structures were proposed by elemental analysis, and infrared and ultraviolet-visible spectroscopy; the proton NMR spectrum of the mbH ligand was also recorded. The azo-azomethine ligand, mbH, behaves as a bidentate ligand coordinating through the nitrogen atom of the azomethine (--CH=N--) and the oxygen atom of the phenolic group. Elemental analyses indicated that the metal:ligand ratio was 1:2 in the metal chelates. Powder X-ray diffraction parameters suggested …
Selective Synthesis Of Cyclododec-2-En-1-Yl Ethers Via Palladium-Catalyzed Allylic Substitution Reaction: A Kinetic Study, Asen Kolev, Magdalena Mitkova, Stefan Kotov, Encho Balbolov
Selective Synthesis Of Cyclododec-2-En-1-Yl Ethers Via Palladium-Catalyzed Allylic Substitution Reaction: A Kinetic Study, Asen Kolev, Magdalena Mitkova, Stefan Kotov, Encho Balbolov
Turkish Journal of Chemistry
The palladium-catalyzed reaction between isomeric cyclododec-2-en-1-yl acetates and primary aliphatic alcohols was found to result in high yields of the reaction products obtained. The selectivity with respect to cyclododec-2-en-1-yl ethers formed as reaction products ranged from 73% to 93%. The kinetics of the reaction of acetoxycyclododec-2-enes with alcohols was studied within the temperature range of 328--358 K. A kinetic equation best fitting the experimental data was provided.
Study Of The Interaction Between Glucosamine Hydrochloride And Sodium Dodecylsulphate Micelles Using Conductometric, Isothermal Calorimetry, Zeta-Potential Titrations, And Nmr Noesy, Marcos Roberto Abreu Alves, Luciano Sindra Virtuoso, Elson Santiago De Alvarenga, Ângelo Márcio Leite Denadai
Study Of The Interaction Between Glucosamine Hydrochloride And Sodium Dodecylsulphate Micelles Using Conductometric, Isothermal Calorimetry, Zeta-Potential Titrations, And Nmr Noesy, Marcos Roberto Abreu Alves, Luciano Sindra Virtuoso, Elson Santiago De Alvarenga, Ângelo Márcio Leite Denadai
Turkish Journal of Chemistry
The aim of this work was to investigate the influence of an anti-inflammatory agent, the bulky counterion named glucosamine (Gl^+), in sodium dodecylsulphate (SDS) in 2 ways: 1) by titration of SDS solutions with different concentrations of Gl^+; and 2) by titration of Gl^+ with SDS solution with concentration close to the critical micellar concentration (cmc) (7.7 mM). In procedure 1, micellisation study by isothermal titration calorimetry (ITC) showed that the increase in Gl^+ concentration reduces the cmc and the micellisation enthalpy. Increasing of the micellisation entropy was also observed, suggesting desolvation of micellar structures as a consequence of electrostatic …
Effect Of Boric Acid On Corrosion And Electrochemical Performance Of Pb-0.08% Ca-1.1% Sn Alloys Containing Cu, As, And Sb Impurities For Manufacture Of Grids Of Lead-Acid Batteries, Said Salih, Ahmed Gad-Allah, Ashraf Abd El-Wahab, Hamid Abd Elrahman
Effect Of Boric Acid On Corrosion And Electrochemical Performance Of Pb-0.08% Ca-1.1% Sn Alloys Containing Cu, As, And Sb Impurities For Manufacture Of Grids Of Lead-Acid Batteries, Said Salih, Ahmed Gad-Allah, Ashraf Abd El-Wahab, Hamid Abd Elrahman
Turkish Journal of Chemistry
The electrochemical performance of lead-acid batteries made of Pb--Ca--Sn alloys with and without 0.1% of each of Cu, As, and Sb individually and combined in 4.0 M H_2SO_4 in the absence and presence of 0.4 M H_3BO_3 was studied. Both impurities and H_3BO_3 were found to reduce the corrosion rate. Cyclic voltammetry revealed that the presence of impurities or H_3BO_3 significantly retarded the formation of large crystal PbSO_4. H_3BO_3 increased the rates of oxygen and hydrogen evolution reactions for all alloys. Impedance measurement was used to quantify the amounts of PbSO_4 and PbO in the initial stage of the oxidation. …
Synthesis And Characterization Of New (E)-N'-(Substituted Benzylidene)-2-(3-(2-Methyl)-4-Oxo-3,4-Dihydroquinazolin-2-Ylthio)Acetohydrazides, Aamer Saeed, Shams-Ul Mahmood, Ulrich Flörke
Synthesis And Characterization Of New (E)-N'-(Substituted Benzylidene)-2-(3-(2-Methyl)-4-Oxo-3,4-Dihydroquinazolin-2-Ylthio)Acetohydrazides, Aamer Saeed, Shams-Ul Mahmood, Ulrich Flörke
Turkish Journal of Chemistry
A small library of new azomethine derivatives of 3-aryl-2-thioxo-2,3-dihydroquinazolin-4(1H)-ones was synthesized. The key intermediates 2-thioxo-quinazolinones (3a--e), obtained in 2 steps from the corresponding anilines, were treated with methyl chloroacetate to afford S-substituted esters (4a,d), which were then converted into corresponding acetohydrazides (5a,d). Further, acetohydrazide (5d) was converted to the azomethines derivatives (6a--k) by reacting with a number of suitably substituted benzaldehydes. FTIR, ^1H NMR, ^{13}C NMR, GC-MS, and elemental analyses were used to confirm the assigned structures of the synthesized compounds. Further, compounds 3a, 5, and 6j were also confirmed by X-ray diffraction data.
Calixpenams: Synthesis, Characterization, And Biological Evaluation Of Penicillins V And X Clustered By Calixarene Scaffold, Fazel Nasuhi Pur, Karim Akbari Dilmaghani
Calixpenams: Synthesis, Characterization, And Biological Evaluation Of Penicillins V And X Clustered By Calixarene Scaffold, Fazel Nasuhi Pur, Karim Akbari Dilmaghani
Turkish Journal of Chemistry
Four 6-aminopenicillanic acid moieties were grafted at either rim of calix[4]arene, giving 2 novel generations of penicillin, which were named calixpenam. Antibiotic tests showed that they have amplified activity with respect to the corresponding penams against 3 gram-positive nonpenicillinase-producing strains of Streptococcus.
Optimization Of Lifepo_4 Synthesis By Hydrothermal Method, Muhsi̇n Mazman, Ömür Çuhadar, Davut Uzun, Ercan Avci, Emre Bi̇çer, Tevhi̇t Cem Kaypmaz, Ümüt Kadi̇roğlu
Optimization Of Lifepo_4 Synthesis By Hydrothermal Method, Muhsi̇n Mazman, Ömür Çuhadar, Davut Uzun, Ercan Avci, Emre Bi̇çer, Tevhi̇t Cem Kaypmaz, Ümüt Kadi̇roğlu
Turkish Journal of Chemistry
Optimization of the LiFePO_4 cathode active material synthesis process in the hydrothermal method consists of many factors, including pH, carbon coating, particle size optimization, sintering and hydrothermal synthesis temperature. The main goal of this study is to determine the effect of particle size, pH and carbon coating on capacity and cycle performance. In this study, LiFePO_4 cathode active materials were prepared at different pH (6.5 and 8.5) and temperature (160 and 180 °C) levels using the hydrothermal method. The hydrothermal synthesis products were sintered at 400, 500, 600, and 700 °C with 5% and 7% carbon source. The initial discharge …
Platinum Or Nickel Nanoparticles Decorated On Silica Spheres By Microwave Irradiation Technique, Ayşe Bayrakçeken
Platinum Or Nickel Nanoparticles Decorated On Silica Spheres By Microwave Irradiation Technique, Ayşe Bayrakçeken
Turkish Journal of Chemistry
Supported catalysts are of great interest because of their wide range of application possibilities. In this study, firstly silica spheres were synthesized and then platinum and nickel nanoparticles were incorporated on this silica by microwave irradiation, which is an efficient technique for catalyst preparation. Synthesized silica spheres and catalysts were characterized by BET, X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, and transmission electron microscopy techniques. Pt or Ni nanoparticles well dispersed over silica support were obtained using microwave irradiation.
Synthesis And Characterization Of New Metallophthalocyanines Containing O_4s_2 Mixed-Donor Substituted Macrocyclic Groups, Meltem Betül Kiliçaslan, Hali̇t Kanteki̇n
Synthesis And Characterization Of New Metallophthalocyanines Containing O_4s_2 Mixed-Donor Substituted Macrocyclic Groups, Meltem Betül Kiliçaslan, Hali̇t Kanteki̇n
Turkish Journal of Chemistry
New phthalocyanine compounds containing mixed-donor substituted macrocyclic groups were synthesized. The complexes of metal phthalocyanines 3--5 were prepared by the reaction of 2 to get dinitrile derivative complexes by means of the corresponding anhydrous metal salts. Structures of the new compounds were characterized by IR, ^1H NMR, ^{13}C NMR, elemental analysis, and MS spectral data.
Geology, Mineralogy, Geochemistry, And Depositional Environment Of A Late Miocene/Pliocene Fluviolacustrine Succession, Cappadocian Volcanic Province, Central Anatolia, Turkey, Ersel Göz, Selahatti̇n Kadi̇r, Ali̇ Gürel, Muhsi̇n Eren
Geology, Mineralogy, Geochemistry, And Depositional Environment Of A Late Miocene/Pliocene Fluviolacustrine Succession, Cappadocian Volcanic Province, Central Anatolia, Turkey, Ersel Göz, Selahatti̇n Kadi̇r, Ali̇ Gürel, Muhsi̇n Eren
Turkish Journal of Earth Sciences
This paper investigates the mineralogy, geochemistry, and depositional environment of Late Miocene/Pliocene fluviolacustrine deposits, including multiple ignimbrite levels and andesitic and basaltic lavas, within the Cappadocian Volcanic Province (CVP) of central Anatolia, Turkey. Palaeosols and calcretes formed within these terrestrial sedimentary rocks under near-surface or surface conditions. The palaeosols are composed predominantly of smectite ± illite with feldspar, quartz, calcite, opal-CT, and amphibole, and the calcretes mainly of calcite with minor feldspar, quartz, and accessory smectite ± palygorskite. The palygorskite occurs on and between the calcite crystals in the calcretes and at the edges of smectite flakes within the palaeosols, …
Temporal Evolution Of The Water Characteristics In The Bays Along The Eastern Coast Of The Aegean Sea: Saros, İzmir, And Gökova Bays, Canan Eronat, Erdem Sayin
Temporal Evolution Of The Water Characteristics In The Bays Along The Eastern Coast Of The Aegean Sea: Saros, İzmir, And Gökova Bays, Canan Eronat, Erdem Sayin
Turkish Journal of Earth Sciences
The seasonal and interannual variability of the local hydrography in 3 bays (Saros, İzmir, and Gökova bays) along the eastern coast of the Aegean Sea are investigated using data sets collected from 1991 to 2010. The data cover the last major deep-water formation episodes and the Eastern Mediterranean Transient (EMT) relaxation period. Aegean Sea hydrology and water mass characteristics influence the water properties of the bays. The data suggest that Saros Bay (North Aegean Sea), İzmir Bay (Central Aegean Sea), and Gökova Bay (South Aegean Sea) have different physical processes and water characteristics. They have their own dynamics independent from …
Eocene To Early Oligocene Turbidite Sedimentation In The Se Aegean (Karpathos Island, Se Greece): Stratigraphy, Facies Analysis, Nannofossil Study,And Possible Hydrocarbon Potential, George Pantopoulos, Avraam Zelilidis
Eocene To Early Oligocene Turbidite Sedimentation In The Se Aegean (Karpathos Island, Se Greece): Stratigraphy, Facies Analysis, Nannofossil Study,And Possible Hydrocarbon Potential, George Pantopoulos, Avraam Zelilidis
Turkish Journal of Earth Sciences
Paleogene turbidite deposits that outcrop at the SE Aegean (Karpathos Island, SE Greece) were investigated using sedimentological, biostratigraphical, and organic geochemical techniques. Results indicate that turbidite sedimentation in the area took place from the Early Eocene (NP12-14) to Late Eocene-Early Oligocene (NP20-21). Six different units were recognized in the turbidite succession based on sedimentological characteristics, outcropping in 2 major areas of the island (1 in the north and 1 in the south) and having a thickness of less than 1000 m. Deposition and spatial arrangement of sedimentary facies was affected by the already deformed carbonate substratum and changes in the …
Toxic Element Contamination In Waters From The Massive Sulfide Deposits And Wastes Around Giresun, Turkey, Necati̇ Karakaya, Muazzez Çeli̇k Karakaya
Toxic Element Contamination In Waters From The Massive Sulfide Deposits And Wastes Around Giresun, Turkey, Necati̇ Karakaya, Muazzez Çeli̇k Karakaya
Turkish Journal of Earth Sciences
This study assessed the quality of water polluted with mine drainage waters, some of which is used for drinking and agriculture, in the urban areas of the Giresun region, Turkey. A total of 40 water samples were collected from the main rivers and stream, spring, and drainage waters. All samples were analyzed for physical and chemical parameters. The tectonically controlled massive sulfide deposits hosted in the Maastrichtian-Eocene magmatic rocks are either active or have been abandoned. The main ore mineral assemblages are chalcopyrite, sphalerite, galena, and pyrite. The oxidation of the sulfide minerals in the deposits and wastes has caused …
Reservoir Characterization Of The Burqan Formation Sandstone From Midyan Basin, Northwestern Saudi Arabia, Abdulaziz Al-Laboun, Abdurrahman Al-Quraishi, Haider Zaman, Mohammed Benaafi
Reservoir Characterization Of The Burqan Formation Sandstone From Midyan Basin, Northwestern Saudi Arabia, Abdulaziz Al-Laboun, Abdurrahman Al-Quraishi, Haider Zaman, Mohammed Benaafi
Turkish Journal of Earth Sciences
The Early Miocene sandstone of the Burqan Formation from Midyan Basin is considered an oil-bearing unit. The outcrops of this sandstone, which are exposed in the northwestern part of the basin, have been studied through field and laboratory-based investigations. During the field work, 81 surface samples were collected for reservoir characterization. Laboratory analyses were undertaken to determine the effect of the diagenesis on the reservoir quality using integrated sedimentological, petrological, and petrophysical analyses. According to these analyses, the sandstone of Burqan Formation is predominately subarkosic and sublitharenite in nature, medium to course grained in size, rounded to subangular in shape, …
Comparative Geochemical Study Of Soils Developed On Characteristic Black And Yellow Polymetallic Massive Sulfide Deposits In Eastern Pontides (Ne Turkey), Nezi̇hi̇ Köprübaşi, Emi̇n Çi̇ftçi̇, Sai̇t Cordan, Necla Köprübaşi, Cafer Özkul, Fatma Şi̇şman Tükel
Comparative Geochemical Study Of Soils Developed On Characteristic Black And Yellow Polymetallic Massive Sulfide Deposits In Eastern Pontides (Ne Turkey), Nezi̇hi̇ Köprübaşi, Emi̇n Çi̇ftçi̇, Sai̇t Cordan, Necla Köprübaşi, Cafer Özkul, Fatma Şi̇şman Tükel
Turkish Journal of Earth Sciences
The Harşit-Köprübaşı (Tirebolu) and Killik (Espiye) volcanogenic massive sulfide (VMS) deposits occur in the Eastern Pontide tectonic belt, one of the major tectonic units comprising Anatolia. They are hosted by Late Cretaceous dacitic to rhyolitic rocks overlain by thin layers of pelitic sediments. The region is considered as a metallogenic province since it is a host to numerous VMS deposits, mainly of the Kuroko type, with varying sizes and reserves and with fairly similar geochemical and mineralogical characteristics. In this study, 489 soil samples were systematically collected from both known mineralized sites and remote areas that have no indication of …
Terebella Lapilloides Münster, 1833 From The Upper Jurassic-Lower Cretaceous İnaltı Carbonates, Northern Turkey: Its Taxonomic Position And Paleoenvironmental-Paleoecological Significance, Mustafa Yücel Kaya, Demi̇r Altiner
Terebella Lapilloides Münster, 1833 From The Upper Jurassic-Lower Cretaceous İnaltı Carbonates, Northern Turkey: Its Taxonomic Position And Paleoenvironmental-Paleoecological Significance, Mustafa Yücel Kaya, Demi̇r Altiner
Turkish Journal of Earth Sciences
The agglutinating annelid Terebella lapilloides Münster, 1833 is commonly encountered in reefal deposits from the Late Jurassic. This annelid is described and documented for the first time from the Upper Jurassic-Lower Cretaceous carbonates of the İnaltı Formation in the Central Pontides, Turkey. The whole İnaltı formation, 395 m in thickness, was studied near Bürnük village and 105 samples were collected along the section. The investigated thin sections reveal the shallow water and the reefal/fore-reefal character of the carbonates with coral-sponge frame-builders. The bioconstituents are accompanied by various microencrusters and microproblematica (such as Lithocodium aggregatum, Bacinella-type structures, Koskinobullina socialis, Radiomura cautica, …
Bramatherium (Artiodactyla, Ruminantia, Giraffidae) From The Middle Siwaliks Of Hasnot, Pakistan: Biostratigraphy And Palaeoecology, Muhammad Akbar Khan, Muhammad Akhtar, Ammara Irum
Bramatherium (Artiodactyla, Ruminantia, Giraffidae) From The Middle Siwaliks Of Hasnot, Pakistan: Biostratigraphy And Palaeoecology, Muhammad Akbar Khan, Muhammad Akhtar, Ammara Irum
Turkish Journal of Earth Sciences
We describe here new remains of the giraffid Bramatherium, from the late Miocene-early Pliocene of Hasnot, northern Pakistan. The fossil giraffid material from Hasnot represents 2 taxa of Bramatherium, B. megacephalum and B. grande. The Hasnot locality is characterised by high proportions of ruminants, namely Boselaphini, Antilopini, Sivatheriinae, Cervini, Dorcatherium, and Dorcabune. The Hasnot fossil ruminant assemblage is fairly typical for the Siwalik province and comparisons with the Greco-Iranian-Afghan and African palaeobiological provinces indicate a late Miocene-early Pliocene age. It is suggested that local Hasnot palaeoenvironments comprised wetlands to woodland biomes, perhaps devoid of expansive dense forests.
On The Reconstruction Of Plant Photosynthetic And Stress Physiology Across The Triassic-Jurassic Boundary, Matthew Haworth, Angela Gallagher, Elysia Sum, Marlene Hill-Donnelly, Margret Steinthorsdottir, Jennifer Mcelwain
On The Reconstruction Of Plant Photosynthetic And Stress Physiology Across The Triassic-Jurassic Boundary, Matthew Haworth, Angela Gallagher, Elysia Sum, Marlene Hill-Donnelly, Margret Steinthorsdottir, Jennifer Mcelwain
Turkish Journal of Earth Sciences
The Triassic-Jurassic boundary (TJB) coincides with major disruption to the carbon cycle and global warming as the Central Atlantic Magmatic Province developed. This resulted in both marine and terrestrial extinctions, with terrestrial plants thought to experience thermal stress as global temperatures and atmospheric CO_2 levels rose. As plant compression fossils typically only preserve external morphological features, it has not been possible to reconstruct plant paleophysiology in order to elucidate the mechanisms underlying plant stress and extinction. Here we present a new approach allowing us to infer the photosynthetic performance and stress physiology of fossil plants, applied to fossil Ginkgoales across …
Experimental Investigation Of Mixtures Of Bentonite And Dredged Sediments From Chorfa Dam In Algeria, Zehour Labiod - Aloui, Habib Trouzine, Moulay Smaine Ghembaza, Tahar Nouioua, Yahya Sebaibi
Experimental Investigation Of Mixtures Of Bentonite And Dredged Sediments From Chorfa Dam In Algeria, Zehour Labiod - Aloui, Habib Trouzine, Moulay Smaine Ghembaza, Tahar Nouioua, Yahya Sebaibi
Turkish Journal of Earth Sciences
Geotechnical properties of dredged sediment from Chorfa dam in Algeria and their mixtures (5%, 10%, 15%, 20%, and 25%) with bentonite were investigated through a series of laboratory experimental tests in order to investigate possibilities of their usage as a barrier against the spread out of the Sebkha of Oran in the northwest of Algeria. Grain size and Atterberg limits tests, chemical and mineral analyses, and compaction, vertical swelling, and horizontal and vertical permeability tests were performed on the soils and their mixtures using tap water and the salty Sebkha water. The results indicate that the bentonite specimens remolded and …
Appraisal Of Active Tectonics Using Dem-Based Hypsometric Integral And Trend Surface Analysis In Emilia-Romagna Apennines, Northern Italy, Saima Siddiqui, Mauro Soldati
Appraisal Of Active Tectonics Using Dem-Based Hypsometric Integral And Trend Surface Analysis In Emilia-Romagna Apennines, Northern Italy, Saima Siddiqui, Mauro Soldati
Turkish Journal of Earth Sciences
The hypsometric integral (HI) has generally been used to explain the stages of landscape evolution and erosional processes. It is an important tool to investigate tectonics and lithologic and climatic effects on topographic change. We analyzed the significance of the HI to investigate active tectonics in the Emilia-Romagna Apennines of northern Italy. We used a digital elevation model of 5-m spatial resolution to calculate grid-based HI values. The HI distribution does not show clear spatial patterns of high and low HI values. However, when statistical methods of local indices of spatial autocorrelation were applied, it was possible to identify clear …
Assessment Of The Perchertal Avalanche In Tyrol, Austria, Tayfun Kurt
Assessment Of The Perchertal Avalanche In Tyrol, Austria, Tayfun Kurt
Turkish Journal of Earth Sciences
The present study has been conducted to analyze the Perchertal avalanche area near Bärenkopf Mountain, which has several avalanche-prone areas on its slopes, within the area of Pertisau, Tyrol, in Austria. The main focus is on identifying the characteristics of the avalanche process itself to determine the potential risk to endangered objects, which include an important road and a hotel. Another focus is to evaluate the current local hazard map. Based on the dynamic avalanche models (Samos-AT, Ramms), several important action parameters such as impact pressure, avalanche velocity, and run-out length of the Perchertal avalanche track are presented and discussed. …
Seismic Hazard Assessment Of Turkey By Statistical Approaches, Serpi̇l Ünal, Sali̇h Çelebi̇oğlu, Bülent Özmen
Seismic Hazard Assessment Of Turkey By Statistical Approaches, Serpi̇l Ünal, Sali̇h Çelebi̇oğlu, Bülent Özmen
Turkish Journal of Earth Sciences
In this study, 2 probabilistic methods are presented for seismic hazard assessment in Turkey: Markov chains based on modeling the transition probabilities of states (related to the presence or absence of the earthquakes having magnitude M >= 4 during the time interval \Deltat = 0.07 years in each region of Turkey located between 36°N and 42°N and 26°E and 45°E), and the Poisson model, used for computing occurrence probability and recurrence periods of earthquakes. In particular, it should be stated that in this study, our purpose is not to compare the results obtained from these 2 methods. The main purpose …
Whole-Rock Geochemistry Of Basic And Intermediate Intrusive Rocks In The Ishiagu Area: Further Evidence Of Anorogenic Setting Of The Lower Benue Rift, Southeastern Nigeria, Anthony Chukwu, Smart Chika Obiora
Whole-Rock Geochemistry Of Basic And Intermediate Intrusive Rocks In The Ishiagu Area: Further Evidence Of Anorogenic Setting Of The Lower Benue Rift, Southeastern Nigeria, Anthony Chukwu, Smart Chika Obiora
Turkish Journal of Earth Sciences
Petrographic studies on the intrusive rocks from the Ishiagu area show that they are gabbro, dolerites, and diorite. The gabbro and diorite occur as stocks while the dolerites occur as sills in folded sedimentary sequence predominated by shale. Geochemical data confirmed the rocks as basic (gabbro and dolerites) and intermediate (diorite) rocks with silica contents ranging from 42.45 to 50.75 wt.% and 55.03 to 60.24 wt.%, respectively. They are predominantly alkaline (gabbro, dolerites, and diorites) with sparse tholeiites (few gabbro). The basic rocks are made up of calcic plagioclase (An_{49-54}), clinopyroxene, olivine (altered), nepheline, and opaques, while the intermediate rocks …
First Report Of Sphaeronitid Blastozoans (Echinodermata) In The Middle Ordovician Of The Taurides, Turkey, Elise Nardin, Mehmet Cemal Göncüoğlu, Bertrand Lefebvre
First Report Of Sphaeronitid Blastozoans (Echinodermata) In The Middle Ordovician Of The Taurides, Turkey, Elise Nardin, Mehmet Cemal Göncüoğlu, Bertrand Lefebvre
Turkish Journal of Earth Sciences
Articulated echinoderm remains are described for the first time in the Ordovician of Turkey. They occur massively, forming a relatively thick cystoid bed within the detrital limestone succession of the Sobova Formation (latest Dapingianearliest Darriwilian) in the western Taurus Mountains. The cystoid bed encompasses a monospecific echinoderm assemblage of densely packed, 3-dimensionally preserved thecae. The presence of numerous suborganised plates with diplopore respiratory structures suggests probable affinities with sphaeronitid blastozoans. Comparable sphaeronitid dense beds are well known in the early Darriwilian of Baltica, and in the mid Darriwilian of the Middle East and Asian terranes.