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Phylogenetic Insights Into Three Turkish Native Sheep Breeds Through Microsatellite Analysis, Mesut Yildirir, Tülay Canatan, Nezi̇h Ata, Zuhal Gündüz, Emre Alarslan, Yasemi̇n Öner, Onur Yilmaz
Phylogenetic Insights Into Three Turkish Native Sheep Breeds Through Microsatellite Analysis, Mesut Yildirir, Tülay Canatan, Nezi̇h Ata, Zuhal Gündüz, Emre Alarslan, Yasemi̇n Öner, Onur Yilmaz
Turkish Journal of Veterinary & Animal Sciences
Animal genetic resources are recognized as an indispensable component of humanity’s natural heritage and are essential for ensuring environmental sustainability for future generations. The aim of this study was to investigate the genetic diversity, population structure, and presence of genetic bottlenecks in three indigenous Turkish sheep breeds: Dağlıç, Karagül, and Sakız, all of which are conserved as genetic resources in Türkiye. Genomic DNA was extracted from 140 blood samples using the salt precipitation technique. These samples were collected from the Sakız (n = 53), Dağlıç (n = 58), and Karagül (n = 29) breeds, which were reared on 13 farms …
Soil Geochemistry Characteristics Of Bimodal-Mafic Type Vms Deposits In The Central Pontides: Importance Of Data Investigation In Exploration And Following Discovery, Buğra Çavdar, Kurtuluş Günay
Soil Geochemistry Characteristics Of Bimodal-Mafic Type Vms Deposits In The Central Pontides: Importance Of Data Investigation In Exploration And Following Discovery, Buğra Çavdar, Kurtuluş Günay
Turkish Journal of Earth Sciences
Çangaldağ Metamorphic Complex is defined with low grade metamorphic equivalents of mafic to felsic intrusive and extrusives, clastics and volcanoclastics. The Au-Cu-Zn Say Yayla (deeply-seated; West Zone) and the Au-dominant Büyük Hill (gossan related; East Zone) deposits are classified as bimodal-mafic type VMS in that complex and they are hosted in the metafelsic ensimatic arc volcanics. These were investigated by soil samples developed over each mineralization to examine the soil characteristics with different textural features. A total of 274 soil samples were collected and they have been geochemically analysed and examined using various statistical methods. The results reveal that both …
Integrated Geochemical, Geoelectrical, And Uav-Based Methods For Analyzing The Güzelyalı Landslide (Çanakkale, Türkiye), Oya Erenoğlu, Emi̇n Ulugergerli̇, R. Cüneyt Erenoğlu, Abdullah Akbaş, Ahmet Evren Ergi̇nal
Integrated Geochemical, Geoelectrical, And Uav-Based Methods For Analyzing The Güzelyalı Landslide (Çanakkale, Türkiye), Oya Erenoğlu, Emi̇n Ulugergerli̇, R. Cüneyt Erenoğlu, Abdullah Akbaş, Ahmet Evren Ergi̇nal
Turkish Journal of Earth Sciences
The number of reactivations increased in the Güzelyalı-Erenköy landslide area after 2013 in Çanakkale, Türkiye, where historical landslide activity has been recorded since 1875. This area is home to numerous summer residences and experiences ongoing slow-moving landslide activity along a 400-m-long slope, extending from the heavily trafficked Çanakkale-İzmir highway to the coastline. In this study, the nature of the reactivations was evaluated by considering the conditioning and triggering factors that contributed to the landslide. The evaluation was based on geochemical analyses, field observations, geoelectric measurements, and unmanned aerial vehicle (UAV) data. The results revealed that the sliding occurred along a …
Apatite Chemistry From The Xv Ioa Deposit, The Bafq–Saqand Metallogenic Province (Bsmp), Central Iran: Constrains On The Genesis Of Ioa Deposits, Sakine Amraei, Majid Ghasemi Siani, Mohammad Yazdi, Liang Qiu, Chang–Zhi Wu, Minghua Ren, Shahrokh Rajabpour
Apatite Chemistry From The Xv Ioa Deposit, The Bafq–Saqand Metallogenic Province (Bsmp), Central Iran: Constrains On The Genesis Of Ioa Deposits, Sakine Amraei, Majid Ghasemi Siani, Mohammad Yazdi, Liang Qiu, Chang–Zhi Wu, Minghua Ren, Shahrokh Rajabpour
Turkish Journal of Earth Sciences
In this study, we present petrographical and microanalytical (EPMA, LA–ICP–MS) results of apatites associated with Fe–Ti±P mineralization in the XV deposit in the BSMP. Apatite is predominantly observed as subhedral to euhedral, homogeneous grains, with no zoning or inclusions. Geochemically, apatite is fluorapatite of magmatic origin, with Cl/OH and Cl/F ratios of <0.05 and 0.01 to 0.07, respectively. Apatites from XV and other IOA deposits in the BSMP display a high F/Cl ratio, which is likely the main characteristic of IOA–type deposits such as the Kiruna-type deposit. Apatites from both rock types (gabbro and pyroxenite) exhibit similar rare earth elements (REEs) and multitrace element patterns, indicative of a shared origin. The highly light rare earth elements (LREEs)–enriched pattern in chondrite–normalized fractionation trends, along with positive Eu and slight negative Ce anomalies, as well the high (La/Sm)N and (La/Yb)N ratios of XV apatite, further corroborates the magmatic genesis of fluorapatite. The Eu/Eu* and Ce/Ce* ratios in XV rocks imply a high oxidation condition, as well as other IOA deposits in BSMP. The sulfur content is less than 1 wt% and shows a positive correlation with SiO2, implying coupled dissolution–reprecipitation of primary fluorapatite. Considering the geological setting of XV and other IOA deposits in the BSMP, the parental magma(s) appear to have originated from oxidizing Fe-Ti±P-rich magma(s), likely formed within an extensional postcollisional setting, influenced by the Proto–Tethys and Central Iranian Microcontinent (CIMC) convergence events.
First Record Of Scyphocrinoids In Türkiye And Recognition Of The Silurian/Devonian Boundary Interval (Halevikdere Section, Eastern Taurides), Eberhard Schindler, Reimund Haude, Mehmet Namik Yalçin, Rainer Brocke, Ati̇ke Nazi̇k, Emine Şeker Zor, Volker Wilde, Achim Wehrmann
First Record Of Scyphocrinoids In Türkiye And Recognition Of The Silurian/Devonian Boundary Interval (Halevikdere Section, Eastern Taurides), Eberhard Schindler, Reimund Haude, Mehmet Namik Yalçin, Rainer Brocke, Ati̇ke Nazi̇k, Emine Şeker Zor, Volker Wilde, Achim Wehrmann
Turkish Journal of Earth Sciences
During the Silurian/Devonian (S/D) boundary interval, scyphocrinoids (Crinoidea, Echinodermata) flourished on a global scale. The first record of scyphocrinoids from Türkiye, especially represented by their bulbuous loboliths, is now described from the Halevikdere Section in the Eastern Taurides. The Devonian part of the section is more than 1300 m thick and covers a time span from the S/D boundary interval to the Late Devonian (Famennian). It consists mainly of fine-grained to sandy siliciclastics, event-driven conglomerates/fanglomerates and biogenic carbonates deposited in deep shelf to shallow-water coastal settings. The S/D boundary interval was measured and studied in great detail. The dominant lithology …
The Quaternary Fluvial-Lacustrine System In The Akarçay Basin (Sw Anatolia): Depositional Environments And Paleoclimatic Interpretation, Koray Aktürk, Sevi̇nç Kapan
The Quaternary Fluvial-Lacustrine System In The Akarçay Basin (Sw Anatolia): Depositional Environments And Paleoclimatic Interpretation, Koray Aktürk, Sevi̇nç Kapan
Turkish Journal of Earth Sciences
The Akarçay Closed Basin, located in southwest Anatolia, contains deformed formations and the drying Akşehir and Eber lakes. This study aimed to interpret the paleoenvironmental and paleoclimatic conditions of the Akşehir and Eber lakes, which are reported to have been connected during the Pleistocene. Based on sedimentological and mineralogical data, three different depositional subenvironments were defined, corresponding to the formation and development stages of the lake. Sedimentary facies analysis of the Pleistocene deposits in the basin revealed the following facies associations, listed from bottom to top: 1) an alluvial fan and fluvial facies association, representing the formation stage of the …
Formation Of Holocene Paleosols In A Relict Sand Dune Sequence At Kıyıköy, Türkiye, Ahmet Evren Ergi̇nal, Mustafa Bozcu, Nuretti̇n Yakupoğlu, Abdullah Akbaş, Hakan Kaya, İsmai̇l Onur Tunç
Formation Of Holocene Paleosols In A Relict Sand Dune Sequence At Kıyıköy, Türkiye, Ahmet Evren Ergi̇nal, Mustafa Bozcu, Nuretti̇n Yakupoğlu, Abdullah Akbaş, Hakan Kaya, İsmai̇l Onur Tunç
Turkish Journal of Earth Sciences
The paleoclimatic indicators from a relict dune and paleosol sequence observed south of Kıyıköy Port, NW Türkiye, provide insights into the variable paleoclimatic conditions in the western Black Sea coastal zone over the last 4700 yrs BP. The relict dune- paleosol sequence consists of reddish-brown coarse sands with abundant shells and overlying paleosol. Radiocarbon dating of Donax trunculus shells collected from the lowest part of the relict dune revealed the onset of sand deposition 4689 ± 123 yrs ago. The dark-colored paleosol layer, with an Rb/Sr ratio of 0.008, yielded an age of 287 ± 32 yrs cal BP. These …
U-Pb Calcite Geochronology, Epr, Geochemistry, And C-O-Sr Isotopes Of Africanomarbles In The Seferihisar (İzmir, Türkiye) U-Pb Calcite Geochronology, Epr, Geochemistry, And C-O-Sr Isotopes Of Africano Marbles In The Seferihisar (İzmir, Türkiye), Fatma Şi̇şman Tükel, Namik Aysal, İpek Deni̇z Yildirim, Marcel Guillong, Tonguç Uysal, Si̇nan Öngen, Emre Erdem
U-Pb Calcite Geochronology, Epr, Geochemistry, And C-O-Sr Isotopes Of Africanomarbles In The Seferihisar (İzmir, Türkiye) U-Pb Calcite Geochronology, Epr, Geochemistry, And C-O-Sr Isotopes Of Africano Marbles In The Seferihisar (İzmir, Türkiye), Fatma Şi̇şman Tükel, Namik Aysal, İpek Deni̇z Yildirim, Marcel Guillong, Tonguç Uysal, Si̇nan Öngen, Emre Erdem
Turkish Journal of Earth Sciences
The Africano marbles (Africano Verde and Bigio Africano) extracted from the region of Sığacık (ancient Teos) region and its surroundings were widely used and even traded in construction and decorative items throughout the Roman period due to their brecciated and colourful appearance. There are two different types of Africano marble, the first consisting of marble breccias embedded in a dark matrix. In this type, the marble breccias show micritic, microsparitic, and sometimes sparitic textures formed by coarse-grained calcite, while the dark matrix consists of chlorite and/or serpentine minerals. The second type is Bigio Africano, which consists of grey-blue homogeneous limestones, …
Vaccine Hesitancy In Türkiye: A Natural Language Processing Study On Social Media, Semi̇h Sari, Ulya Bayram
Vaccine Hesitancy In Türkiye: A Natural Language Processing Study On Social Media, Semi̇h Sari, Ulya Bayram
Turkish Journal of Electrical Engineering and Computer Sciences
Vaccine hesitancy is a significant public healthcare problem that is threatening everyone worldwide. Vaccine hesitancy has become more ingrained in Turkish society, mainly through social media. Unfortunately, reflections of this hesitancy are preventable deaths or permanent disabilities. Because of the uncontrolled spread of misinformation and disinformation on social media, Türkiye is facing a future health crisis. As a step towards preventing this crisis, our main objective is to use the power of artificial intelligence techniques on Turkish social media posts to detect antivaccine posts. Through this study, it will be possible to raise awareness about the importance of vaccines in …
A Hybrid Ahp-Dea Approach For Software Architecture Evaluation And Selection, Mehran Hajipoor, Homayun Motameni, Ali̇ Ebrahimnejad
A Hybrid Ahp-Dea Approach For Software Architecture Evaluation And Selection, Mehran Hajipoor, Homayun Motameni, Ali̇ Ebrahimnejad
Turkish Journal of Electrical Engineering and Computer Sciences
Decisions made during the software architecture stage significantly influence the success or failure of software projects. Software architects must navigate the complex task of selecting the most suitable architecture style while balancing stakeholders’ operational and nonoperational requirements. These requirements often involve diverse and conflicting quality attributes with varying priorities, as well as intricate interactions where some attributes positively or negatively influence others. Furthermore, different architectural styles exhibit varying levels of support for these quality attributes, adding another layer of complexity to the decision-making process. This study leverages the Analytic Hierarchy Process (AHP) and Data Envelopment Analysis (DEA) within a novel …
Enhanced Cuffless Blood Pressure Estimation Using Ecg And Ppg Signals: A Hybrid Approach With Windkessel, Arima, And Lstm, Piyush Mahajan, Amit Kaul
Enhanced Cuffless Blood Pressure Estimation Using Ecg And Ppg Signals: A Hybrid Approach With Windkessel, Arima, And Lstm, Piyush Mahajan, Amit Kaul
Turkish Journal of Electrical Engineering and Computer Sciences
Accurate blood pressure (BP) estimation is essential for the monitoring and management of cardiovascular diseases. This study presents a hybrid model for cuffless BP estimation using electrocardiogram (ECG) and photoplethysmogram (PPG) signals. The model incorporates features from time-domain, frequency-domain, and model-based approaches, including the Windkessel model, AutoRegressive Integrated Moving Average (ARIMA), and Long Short-Term Memory (LSTM) networks. To enhance performance, feature selection and reduction techniques such as Minimum Redundancy Maximum Relevance (MRMR) and autoencoders were employed. Additionally, model ensemble strategies, including average and weighted average modes, were utilized to combine the predictions of different models. The proposed method demonstrated superior …
Robust Sliding Mode Control For Precision Anesthesia Delivery: Addressing Interpatient Variability In Depth Of Hypnosis, Talha Sajjad, Adeel Iqbal, Ali Khaqan, Ali Nauman, Bilal Ijaz, Raja Ali Riaz
Robust Sliding Mode Control For Precision Anesthesia Delivery: Addressing Interpatient Variability In Depth Of Hypnosis, Talha Sajjad, Adeel Iqbal, Ali Khaqan, Ali Nauman, Bilal Ijaz, Raja Ali Riaz
Turkish Journal of Electrical Engineering and Computer Sciences
Anesthesia induction is a critical aspect of ensuring patients' health and safety during surgical procedures. The manual administration of anesthesia can lead to serious medical issues due to variability among patients, as well as the risks of overdosing or underdosing anesthetic drugs. While various linear control techniques have been implemented to enhance the safety of anesthesia infusion, non-linear control strategies have demonstrated superior results in achieving the desired level of hypnosis for surgical activities, primarily due to the significant parametric variations present in different patients.Given these challenges, there is a pressing need to develop an efficient anesthesia infusion system that …
Design And Optimization Of Low-Loss, High-Gain Metamaterial-Based Log-Periodic Dipole Array Antenna For Full Ka-Band Coverage, Mohamed El Moniar, Ahmed Abd El Hady, Yasser Ismail, Nihal Areed
Design And Optimization Of Low-Loss, High-Gain Metamaterial-Based Log-Periodic Dipole Array Antenna For Full Ka-Band Coverage, Mohamed El Moniar, Ahmed Abd El Hady, Yasser Ismail, Nihal Areed
Turkish Journal of Electrical Engineering and Computer Sciences
This work describes a microstrip log-periodic dipole array (MLPDA) antenna that uses metamaterials and operates across the whole Ka-band. The suggested MLPDA antenna layout provides a wide bandwidth with fewer dipole elements than traditional MLPDA antennas while maintaining the same resonance frequencies. To reduce size while covering a wide operational spectrum, the antenna design includes bending dipoles as radiating elements, as well as an incomplete ground plane. Furthermore, the proposed MLPDA antenna’s energy loss has been reduced while boosting its signal strength (gain) by inserting a metamaterial-based structure in front of it at a certain distance and on the same …
A Methodology For Nuclei Segmentation In H&E Images Using Efficientnetb7 Guided U-Net And Multiple Data Augmentation Strategies, Furkan Atlan, Emrah Hançer
A Methodology For Nuclei Segmentation In H&E Images Using Efficientnetb7 Guided U-Net And Multiple Data Augmentation Strategies, Furkan Atlan, Emrah Hançer
Turkish Journal of Electrical Engineering and Computer Sciences
Automating nuclei segmentation in Hematoxylin and Eosin (H&E) stained images is crucial for advancing computational pathology. Despite significant research, challenges such as overlapping nuclei, varying scanner resolutions, and diverse nuclear morphologies continue to hinder segmentation accuracy. In this paper, we propose a deep-learning based methodology that integrates multiple data augmentation strategies with a U-Net architecture enhanced by the EfficientNetB7 encoder. To enhance generalization, we train the model using a combined dataset from MoNuSeg2018, CPM-17, and CoNSeP, exposing it to diverse staining techniques and tissue types. We then evaluate its robustness on the unseen CryoNuSeg dataset, which consists of fully annotated …
Karcı Fractional Artificial Neural Networks (Karcıfann): A New Artificial Neural Networks Model Without Learning Rate And Its Problems, Meral Karakurt, Hülya Saygili, Ali̇ Karci
Karcı Fractional Artificial Neural Networks (Karcıfann): A New Artificial Neural Networks Model Without Learning Rate And Its Problems, Meral Karakurt, Hülya Saygili, Ali̇ Karci
Turkish Journal of Electrical Engineering and Computer Sciences
The learning rate parameter used in classical artificial neural networks (ANNs) designed with stochastic gradient descent causes problems such as failure to learn, getting stuck in local minima, memorization, and long training times (divergence problem). To address these issues, this paper proposes a novel ANN method that uses a fractional derivative instead of Newton’s derivative. This method is referred to as Karcı fractional ANN (KarcıFANN). In classical ANNs, the weight update is done by assigning the same constant value to the learning rate in each iteration or for a set number of iterations. In contrast, in KarcıFANNs, the weight update …
A Proposed Coding Algorithm With Ai-Assisted Restoration Capability, Parviz Gharehbagheri, Hamid Haj Seyyed Javadi
A Proposed Coding Algorithm With Ai-Assisted Restoration Capability, Parviz Gharehbagheri, Hamid Haj Seyyed Javadi
Turkish Journal of Electrical Engineering and Computer Sciences
This paper introduces an innovative encoding method based on the concept of "distancecodes" , which allows characters to appear randomly in different locations during the decoding process. Codeword-based algorithms decode and present their characters sequentially, which can hinder accurate reconstruction in the event of incomplete text decoding, as there is no intelligent or non-intelligent model available for continuing the text reconstruction.In contrast, our proposed algorithm allows for the non-sequential and scattered appearance of characters throughout the data during the decoding process. This enables AI algorithms to restore undecoded characters using contextual information such as decoded characters, adjacent complete and incomplete …
Protein Composition Of The Foam Nest Of Rhacophorus Reinwardtii (Schlegel, 1840) (Anura: Rhacophoridae), With Notes On Breeding Sites Characteristics And Biomedical Applications, Muhammad Asyraf Rijalullah, Nia Kurniawan, Nia Kurnianingsih
Protein Composition Of The Foam Nest Of Rhacophorus Reinwardtii (Schlegel, 1840) (Anura: Rhacophoridae), With Notes On Breeding Sites Characteristics And Biomedical Applications, Muhammad Asyraf Rijalullah, Nia Kurniawan, Nia Kurnianingsih
Turkish Journal of Zoology
Rhacophorus reinwardtii is endemic to Java Island and is currently experiencing a population decline. Therefore, the sustainability of its offspring is important to prevent species extinction. Foam nest as a biosurfactant structure plays a crucial role as egg protection through major protein components function. However, studies on the functional proteins of rhacophoridae foam nests are limited. Thus, this study aims to uncover the protein-specific components and functions of the R. reinwardtii foam nest. Additionally, the characteristics of breeding sites, including abiotic factors, were also assessed. Total protein concentration of the R. reinwardtii foam nest was determined to be 747.7 μg/mL …
Pointwise Slant Riemannian Maps From Almost Contact Metric Manifolds With Horizontal Reeb Vector Field ˆΞ, Ramazan Demi̇r, Cumali̇ Yildirim
Pointwise Slant Riemannian Maps From Almost Contact Metric Manifolds With Horizontal Reeb Vector Field ˆΞ, Ramazan Demi̇r, Cumali̇ Yildirim
Turkish Journal of Mathematics
This paper introduces the notion of pointwise slant Riemannian maps, which extend the concept of slant submanifolds, pointwise slant submanifolds, slant submersions, pointwise slant submersions, and slant Riemannian maps. These maps are defined from almost contact metric manifolds to Riemannian manifolds with horizontal Reeb vektor field . Furthermore, we present examples and investigate the fundamental properties of such maps. Also we explore the geometry of the foliations induced by pointwise slant Riemannian maps and establish decomposition theorems related to their existence.
On The Invariant Integration Of A Vector In Some Problems In Mechanics, Saad Bin Mansoor
On The Invariant Integration Of A Vector In Some Problems In Mechanics, Saad Bin Mansoor
Turkish Journal of Mathematics
Invariant integration of vectors and tensors over manifolds was introduced around fifty years ago by V.N. Folomeshkin, though the concept appears to not have attracted much attention among researchers. Although it is a sophisticated concept, the operation of the invariant integration of vectors is actually required to correctly solve some problems in mechanics. Two such problems are discussed in the present exposition, in the context of a two-dimensional Euclidean space covered by a polar coordinate system. The notion of invariant integration becomes necessary when the space is described without any reference to a Cartesian coordinate system.
On Cesàro And Abel-Poisson Means Of Hexagonal Fourier Series, Ali̇ Güven
On Cesàro And Abel-Poisson Means Of Hexagonal Fourier Series, Ali̇ Güven
Turkish Journal of Mathematics
Approximation properties of Ces`aro and Abel-Poisson means of hexagonal Fourier series are studied. The degree of approximation by these means of hexagonal Fourier series of functions, which are continuous and periodic with respect to the hexagon lattice, is estimated in terms of modulus of continuity of functions.
The Concept Of T-Basis And Vector-Valued Hardy Classes, Bilal Bilalov, Sabina Rahib Sadigova
The Concept Of T-Basis And Vector-Valued Hardy Classes, Bilal Bilalov, Sabina Rahib Sadigova
Turkish Journal of Mathematics
This paper introduces the concept of a t-basis generated by some bilinear mapping t(·;·). It is considered the vector-valued class Lp(X) := Lp(J; X), 1 ≤ p < +∞, where J = [−π, π] and X is a Banach space with the UMD property, and it is proven that the classical system of exponents {eint}n∈ℤ forms a t-basis for Lp(X), 1 < p < +∞. Using this fact, the Hardy vector classes nHp±(X), 1 < p < +∞, different from the classical ones, are defined, and an equivalent definition of these classes is given and some of their properties are studied. In addition, the concept of t-Riesz property of a system of exponentials is introduced in Lp(X), 1 < p < +∞, and it is proved that this system has the t-Riesz property. A new method is given for establishing the Plemelj–Sokhotski formulas for X-valued Cauchy type integrals when X has the UMD property. An abstract analogue of the “1/4-Kadets” theorem is obtained for …
On The Images Of N-Ellipses Under The Möbius Transformations, Ni̇hal Özgür
On The Images Of N-Ellipses Under The Möbius Transformations, Ni̇hal Özgür
Turkish Journal of Mathematics
In this paper, we examine the images of n-ellipses under the Möbius transformations (linear fractional transformations) for n ≥ 3. As a result of this investigation, we present a new and generalized version (called n-generalized Apollonius circle) of the concept of an Apollonius circle in the plane.
On Cr-Structures On The Null Tangent Bundle, Mohamed Tahar Kadaoui Abbassi, Cornelia-Livia Bejan, Khadija Boulagouaz
On Cr-Structures On The Null Tangent Bundle, Mohamed Tahar Kadaoui Abbassi, Cornelia-Livia Bejan, Khadija Boulagouaz
Turkish Journal of Mathematics
The null tangent bundle of an indefinite pseudo-Riemannian manifold is a lightlike hypersurface of the tangent bundle which inherits a CR-structure from the almost Hermitian structure defined by Oproiu on the tangent bundle. We investigate the properties of this structure in relation to the choice of the screen distribution and the geometry of the base manifold.
Discrete Dirac Equations, Bilender Paşaoğlu Allahverdiev, Hüseyi̇n Tuna
Discrete Dirac Equations, Bilender Paşaoğlu Allahverdiev, Hüseyi̇n Tuna
Turkish Journal of Mathematics
In this paper, regular discrete Dirac systems are considered. Some fundamental properties are studied concerning self-adjointness, orthogonality of eigenfunctions, and eigenfunction expansions.
Lancret-Type Results For A New Family Of Curves In Minkowski 3-Space, Héctor Guerrero Mora, Willy Sierra
Lancret-Type Results For A New Family Of Curves In Minkowski 3-Space, Héctor Guerrero Mora, Willy Sierra
Turkish Journal of Mathematics
In this article, using the concept of a Killing vector field along a curve, we extend certain results concerning a family of curves—previously studied in three-dimensional Euclidean space—to the setting of three-dimensional Minkowski space. Depending on the causal character of the curve, we derive Lancret-type results that establish the necessary and sufficient conditions for the existence of this family in three-dimensional Minkowski space. We determine the intrinsic equation of this family in three cases: (i) when the curve is nonnull with a nonnull acceleration vector, (ii) when the curve is spacelike with a null acceleration vector, and (iii) when the …
Geometry Of Conformally Flat Harmonic Nearly Trans-Sasakian Manifolds, Aligadzhi Rabadanovich Rustanov, Svetlana Vladimirovna Kharitonova
Geometry Of Conformally Flat Harmonic Nearly Trans-Sasakian Manifolds, Aligadzhi Rabadanovich Rustanov, Svetlana Vladimirovna Kharitonova
Turkish Journal of Mathematics
Conformally flat harmonic nearly trans-Sasakian manifolds are studied. In the space of adjoint G-structure, components of the Weyl tensor of the conformal curvature are calculated, identities for this tensor are found, and also some conformal invariants of harmonic nearly trans-Sasakian manifold are provided. An exhaustive description of the class W1 of such manifolds is obtained. It is proved that this class is locally equivalent to the product of a complex Euclidean space and a real line. Complete local characteristic of harmonic nearly trans-Sasakian manifolds of the class W6, which are Einstein manifolds, is obtained. Full classification of conformally flat harmonic …
Vilsmeier–Haack Complex Formation By Fe3O4@Sio2@Cs@Pocl2–X/Dmf: An Efficient Catalyst For Conversion Of Epoxides To Β-Bromoformates, Farzaneh Ebrahimzadeh
Vilsmeier–Haack Complex Formation By Fe3O4@Sio2@Cs@Pocl2–X/Dmf: An Efficient Catalyst For Conversion Of Epoxides To Β-Bromoformates, Farzaneh Ebrahimzadeh
Turkish Journal of Chemistry
The in situ generation of the Vilsmeier–Haack complex was studied by combining Fe3O4@SiO2@CS@POCl2–x with N,N-dimethylformamide (DMF), demonstrating remarkable efficiency and regioselectivity in transforming epoxides into β-bromoformates. The reported yields were notably high and were achieved under mild reaction conditions. Interestingly, the removal of DMF led to the synthesis of vic-dihalide compounds. The product of this transformation depended on the specific details of how the experiment was done, highlighting how sensitive the process is to different ways of conducting the experiment. The use of a magnetic core-shell catalyst, Fe3O …
Wo3/Α-Fe2O3/Bi2S3 Ternary Photoanode For Improved Oxygen Evolution Reaction In Photoelectrochemical Water Splitting, Fati̇h Tezcan, Abrar Ahmad, Gülfeza Kardaş
Wo3/Α-Fe2O3/Bi2S3 Ternary Photoanode For Improved Oxygen Evolution Reaction In Photoelectrochemical Water Splitting, Fati̇h Tezcan, Abrar Ahmad, Gülfeza Kardaş
Turkish Journal of Chemistry
This study presents a ternary WO3/α-Fe2O3/Bi2S3 photoanode system suitable for photoelectrochemical water-splitting applications. The WO3/α-Fe2O3 heterojunction is obtained using a hydrothermal approach, while Bi2S3 is deposited onto WO3/α-Fe2O3 via the successive ionic layer adsorption and reaction (SILAR) method. The cycle count is adjusted to determine the optimal photocatalytic photoanode. X-ray diffraction analysis confirms different morphologies and phases for the photoelectrodes: WO3 is deposited as plates with monoclinic phases, α-Fe2O3 as nanorods with hexagonal phases, …
A New Turn Off Fluorescent Nir Probe For Hypochlorous Acid And Its Applications, Ayten Ibrahimova, Ayşe Nur Önem, Mehmet Altun, Emi̇n Ahmet Yeşi̇l, Asli Baysal, Hasan Saygin, Ahu Soyocak, Mustafa Özyürek
A New Turn Off Fluorescent Nir Probe For Hypochlorous Acid And Its Applications, Ayten Ibrahimova, Ayşe Nur Önem, Mehmet Altun, Emi̇n Ahmet Yeşi̇l, Asli Baysal, Hasan Saygin, Ahu Soyocak, Mustafa Özyürek
Turkish Journal of Chemistry
Hypochlorous acid (HOCl) is a potent nonradical oxidant involved in various physiological processes, particularly within the human immune system. In this study, we introduce a novel, rapid, and highly efficient fluorometric method for the detection of HOCl. The method utilizes a near-infrared (NIR)-based fluorescent probe, NIR-QBH, which is characterized by its high sensitivity and chemical stability. NIR-QBH, containing olefinic C=C bonds, exhibits strong NIR emission at 660 nm (λex = 618 nm). The detection mechanism relies on the oxidation of the C=C bond in the NIR-QBH structure by HOCl, resulting in the formation of non-fluorescent products. With a detection limit …