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Koleksiyondaki öğeler
- MakaleAçık Erişim2023Scopus SJRQ1Characterization of the black cumin (Nigella sativa L.) honey from Türkiye
Kemal, Mehmet; Esertaş, Ülkü Zeynep Üreyen; Kanbur, Esra Demir; Kara, Yakup; Özçelik, Ali Erdem; Can, Zehra; Kolaylı, Sevgi
This case report study investigated the botanical, physicochemical, and phenolic compositions, as well as the antioxidant and antimicrobial properties of varying amounts of black cumin honey (Nigella sativa) from Burdur region of Türkiye. The samples had an average moisture value of 17.23% and a Nigella sativa pollen ratio ranging from 19% to 51%. Electrical conductivity (EC) values ranged from 0.36 to 0.54 mS/cm. The average color values of Hunter (L, a, b) were 43.55 (L*), 32.77 (a*), and 64.52 (b*), respectively. The proline contents were ranged from 875 to 1624 mg/kg. The average F/G ratio and F+G value were 1.43±0.11 and 68.75±4.75, respectively. The average of total phenolic (TP) and total flavonoid (TF) contents were 36.87±7.00 mg GAE/100 g and 5.63±1.45 mg QUE/100 g, respectively. The antioxidant capacities of the samples were tested using the ferric reducing/antioxidant power (FRAP) and 2,2-Diphenyl-1-picrylhydrazyl (DPPH) assays, with mean values of 179.40±25.35 μmol FeSO4.7H2O/100 g and 46.07±12.87 mg/mL, respectively. The phenolic composition of the samples were tested using the HPLC-PDA method with 25 phenolic standards. Gallic acid, p-OH benzoic acid, t-cinnamic acid, p-coumaric acid, chrysin, and pinocembrin were determined as common components. The samples exhibited high antimicrobial activities against Staphylococcus aureus, Escherichia coli, Chromobacterium violaceum, Bacillus cereus, Klebsiella pneumoniae, and Acinetobacter haemolyticus, but did not affect Candida albicans, Candida parapilopsis, or Mycobacterium smegmatis.
AtıfScopus27WoS27OpenAlex33
İncele - MakaleYayıncıda açık erişim2024EVALUATION OF NUTRITIONAL PREFERENCES OF SCHOOL-AGE CHILDREN AND PARENTS ATTITUDES TOWARDS CHILD NUTRITION: A CROSS-SECTIONAL STUDY; [AVALIAÇÃO DAS PREFERÊNCIAS NUTRICIONAIS DAS CRIANÇAS EM IDADE ESCOLAR E DAS ATITUDES DOS PAIS EM RELAÇÃO À NUTRIÇÃO INFANTIL: UM ESTUDO TRANSVERSAL]; [EVALUACIÓN DE LAS PREFERENCIAS NUTRICIONALES DE LOS NIÑOS EN EDAD ESCOLAR Y ACTITUDES DE LOS PADRES HACIA LA NUTRICIÓN INFANTIL: UN ESTUDIO TRANSVERSAL]
Taşci, Seda Çelikel; Kırbaş, Zila Özlem; Erkılıç, Tuğçe Orkun; Demir, Demet
Objective: This study aimed to examine the nutrition of school-age children and the influence of their parents. Method: The study involved 259 school-age children aged 9-12 and their volunteering parents from a province in Türkiye. A questionnaire was administered to the children questioning sociodemographic data and basic nutritional information, anthropometric measurements were taken, and the Parent Mealtime Action Scale was applied to their parents. The obtained data were analyzed in SPSS 26 program. Results: It was found that the snack consumption status of children was related to the income status of the family's daily fruit and vegetable consumption (p<0.01). It has been found that animal fat restricted diet is associated with growth status in children (p<0.01). It has been determined that the children's eating situation is related to the persistent behavior of parents (p<0.05). It has been found that children who do not consume chips at all are also fed restricted animal fats in their daily diet. It was determined that bagel/cereal consumption was also excessive in children in whom rewarding was applied excessively (p<0.05). Conclusion: As a result, it was determined that school-age children's own preferences in food choices, as well as the parent's behavior and educational status, and the family's income level also have a significant impact. It is thought that it will be beneficial to provide nutrition education to parents and children in order to develop the right eating habits in school-age children and to increase the level of nutrition knowledge.
- MakaleAçık Erişim2024Scopus SJRQ3THE EFFECT OF DIFFERENT DOSES OF LIQUID VERMICOMPOST APPLICATION ON YIELD AND YIELD COMPONENTS OF SOME POTATO (SOLANUM TUBEROSUM L.) VARIETIES
Gul, Volkan; Gidik, Betul
This is one of the early studies to produce healthy, yielding, and high-quality tubers from the potatoes grown in Bayburt, an organic agriculture basin, using liquid vermicompost that can supplement organic fertilizers. The purpose of this study was to examine the effect of liquid vermicompost applications (0, 3, 6, 9, and 12 L ha-1), which can supplement the stable manure used as bottom fertilizer, on yield and yield components of potato (Solanum tuberosum L.) varieties (Agria and Lady Olympia). The research was designed in random blocks with three replications. As a result of the study, it was found that the tuber yield was within the range of 20.24-30.40 tons’ ha-1, the protein ratio was within the range of 1.53-2.51%, and the starch ratio was within the range of 11.98%-15.99%. The liquid vermicompost doses applied to the potato varieties created significant differences in all three parameters. Due to the positive effect of the Agria (3.40 tons/da) variety on the yield and vegetative development of potatoes, It was concluded that 9 L liquid vermicompost application per decare would be beneficial.
AtıfScopus1İncele - MakaleAçık Erişim2024Scopus SJRQ3Existence and extinction of solutions for parabolic equations with nonstandard growth nonlinearity
Ayazoglu, Rabil; Alisoy, Gulizar; Akbulut, Sezgin; Aydin, Tuba Agirman
In this paper, we consider an initial boundary value problem for a class of p(·)-Laplacian parabolic equation with nonstandard nonlinearity in a bounded domain. By using new approach, we obtain the global and decay of existence of the solutions. Moreover, the precise decay estimates of solutions before the occurrence of the extinction are derived.
AtıfScopus1WoS1OpenAlex1
İncele - MakaleAçık Erişim2024Scopus SJRQ3The Relationship of Mitochondrial-derived Peptide (MOTS-c) and Brain Mitochondrial Carrier Protein 1 (BMCP1) Response in Sheep with Some Physiological Parameters
Bayraktar, B.; Demir, N.; Aksakal, V.
Background: Mitochondria are organelles called power plants of the cell, which are found in eukaryotic cells and are responsible for the production of energy needed by the cells through aerobic respiration. Mitochondrial dysfunction causes endocrinological, cardiovascular, metabolic and neurodegenerative diseases. The aim of this study was to examine the effects of body condition score (BCS), lactation, pregnancy, age and gender on Mitochondrial-Derived Peptide (MOTS-c) and Brain Mitochondrial Transporter Protein 1 (BMCP1) levels in Akkaraman sheep. Methods: Sheep are classified into 3 categories according to BCS (BCS<2, BCS=3-3.5, BCS≥4). In creating groups in terms of BCS, it was determined by the palpation method applied to the waist area. The sheep included in the study were divided into 4 groups: early lactation, early pregnancy, late pregnancy (dry period) and age (female and male sheep).1st group, ewes in the first period of pregnancy (on the 100th day of the first pregnancy) (n= 30), 2nd group, ewes in the early lactation period (n= 30), 3rd group, ewes in the dry period (the last two months of pregnancy) (n= 30) and in the 4th group, <2 (young) (n=30), 2-8 (adult) (n=30), 8> (old) (n=30), male and female sheep (n=30) of different ages. =180) total of 270 animals. Blood samples were taken from the jugular vein of the sheep before the morning feeding. MOTSc and BMCP1 levels were determined in blood serum samples by ELISA method. Result: In the study, serum MOTS-c and BMCP1 levels in sheep during lactation and pregnancy were determined to be lowest in the VKS<2 group and highest in the VKS ≥4 groups. Likewise, in age and gender groups, the highest level was detected in young lambs and yearlings in the VKS<2 group, while the highest level was detected in old sheep and rams in the VKS ≥4 group. As a result, it was determined that different age, gender, pregnancy and lactation periods affected serum MOTS-c and BMCP1 levels depending on the change in BCS (P<0.05). It was concluded that MOTS-c and BMCP1 may be useful parameters in the evaluation of mitochondrial function, energy metabolism and metabolic profile.
AtıfScopus4WoS4OpenAlex2İncele - MakaleAçık Erişim2022Scopus SJRQ1Emerging trends of online assessment systems in the emergency remote teaching period
Topuz, Arif Cem; Saka, Eda; Fatsa, Ömer Faruk; Kurşun, Engin
The COVID-19 pandemic caused many educational institutions in the world to switch to the distance education process, and this process was called "Emergency Remote Teaching". This urgent transition process has caused many problems in educational environments. One of the problems is the subject of measurement and evaluation. Along with the pandemic, many institutions have used various online assessment systems to make measurements and evaluations online, and researchers have conducted research on these online assessment systems. This research focus on the features of the online assessment systems and aims to examine the trends towards the prominent features of the online assessment systems in the Emergency Remote Teaching period. For this purpose, the prominent online assessment systems have been determined by systematically analyzing academic studies published in 2020, and answers have been sought to the following research questions: (1) which platforms they support, (2) which security features they have, and (3) what common features they have. Identifying trends in the characteristics of online assessment systems is expected to guide practitioners, decision-makers, researchers, and system developers in the process of selecting and/or developing an online assessment system for use in online measurement and evaluation.
AtıfScopus37WoS20OpenAlex45
İncele - MakaleAçık Erişim2024Scopus SJRQ1Analytical approach to contact mechanics of functionally graded orthotropic layers with gravitational considerations
Öner, Erdal; Al-Qado, Ahmed Wasfi Hasan
Contact problems involving deformable bodies are widespread in both industrial and everyday situations. They have a crucial impact on structural and mechanical systems, which has led to significant efforts in modeling and numerical simulations. These efforts aim to improve understanding and optimization in various engineering applications. This study examines the contact problem involving a functionally graded (FG) orthotropic layer resting on a rigid foundation, without considering frictional influences. A point load is applied to the layer through a rigid punch on its top surface. Additionally, the gravitational effects of the FG orthotropic layer are considered in the analyses. Material parameters and density of the FG orthotropic layer are presumed to exhibit exponential variations along the vertical axis. The resolution of the problem involves deriving stress and displacement expressions through the application of elasticity theory and integral transformation techniques. By imposing the pertinent boundary conditions onto these expressions, a singular integral equation is formulated, wherein the contact stress under the punch remains unknown. Employing the Gauss–Chebyshev integration method, this integral equation is subsequently numerically solved, particularly for a flat punch profile. The outcomes of this investigation encompass the determination of contact stresses under the punch, the critical separation load, and the critical separation point—marking the initial separation between the FG orthotropic layer and the rigid foundation. Additionally, the analysis yields dimensionless representations of normal stresses along the symmetry axis within the FG orthotropic layer, as well as shear stresses along a designated section proximate to the symmetry axis. Furthermore, it provides insights into the normal stresses along the x axis at the bottom surface of the FG orthotropic layer, contingent upon various parameters and distinct orthotropic material compositions.
AtıfScopus12WoS12OpenAlex12İncele - MakaleYalnız künye2024Scopus SJRQ2Investigation of emotion regulation skills, salivary apelin, and serotonin levels in children in Türkiye: a cross-sectional study
Kırbaş, Zila Özlem; Bayraktar, Bülent; Odabaşı Aktaş, Elif
Purpose: Little is known about the relationship between apelin and serotonin in emotion regulation. This study aimed to examine children’s emotional regulation skills and salivary apelin and serotonin levels. Methods: This is a cross-sectional study performed in Türkiye. The research was completed with the participation of 146 children, 8–10 years old, from the general population. Emotion Regulation Skills Scale for Children (CERS) was used to assess children’s levels of emotion regulation skills. Apelin and serotonin levels were examined by ELISA technique in saliva samples obtained from children. Results: A statistically significant correlation was found between the mean total score of the CERS and the mean apelin and serotonin levels (p ˂.01). We found that females had higher emotion regulation skills compared to males, older higher than younger ones (p ˂.01). The regression analysis results show that age and gender together explain 50.5% of the variance in CERS scores, while apelin and serotonin together explain 35.8% of the variance. When all four variables (age, gender, apelin, and serotonin) are included in the model, they explain 51.3% of the variance in CERS scores. Conclusion: Older age and female gender explained most of emotion regulations skills.Key points It was determined that the average salivary apelin and serotonin levels increased with increased age, and with increased age ERS also increased. More research is needed as this is the first time that the relationship between emotion regulation skills and serotonin and apelin levels has been examined.
AtıfScopus1OpenAlex1İncele - MakaleAçık Erişim2024Polarization Insensitive and Thin Metamaterial Absorber Performed in High-Frequency 5G Bands
Arslan Madak, Seher Şeyma; Teber, Ahmet; Topkaya, Ramazan
A variety of fascinating applications, including 5G communication devices, high-speed data transfer, and large-scale Internet of Things (IoT), make life easier with 5G technology. Despite the 5G’s superior features, the percentage of electromagnetic (EM) waves in the environment execute a significant increase, unpleasantly. Broadband metamaterial absorbers are an appealing alternative to gather these unwanted signals. This study aims to numerically investigate a broadband metamaterial absorber (MMA) in the 5G high-frequency spectral range with the metasurface formed with coupled resistors. In addition, the 24.25-27.5GHz frequency range, one of the high-frequency 5G bands used by selected countries such as the European Union and China, was preferred. The minor aim of this study is that the usage of coupled elements as resistors may have the ability to increase the absorption bandwidth and magnitude. Comprehensive simulations were performed using the finite integration technique (FIT) utilized by the CST Microwave Studio program to investigate the absorber performance and other relevant parameters. The unit cell design is created metal-substrate-metal structures as asymmetric, single-layer, and easy to implement. The absorption responses are investigated according to the oblique incidence angle, polarization angle for TE &TM modes. The suggested MMA provided an absorbency response above 87.6% in the frequency range 24.20-27.30GHz under normal incidence. Moreover, to comprehend the physical mechanism on absorption, the top and bottom surfaces of the absorber's electric field and surface current distributions are assessed. The designed MMA resulting in relatively high performance and polarization insensitive is helpful for electromagnetic interference (EMI) shielding of 5G signals in the FR2/mmWave frequency regime.
AtıfScopus3TR Dizin1İncele - MakaleAçık Erişim2025Scopus SJRQ3INVERSE TRIGONOMETRICALLY CONVEXITY AND BETTER APPROXIMATIONS
Kadakal, Huriye; Kadakal, Mahir
In this paper, we introduce and study the concept of inverse trigonometrically convex functions and their some algebraic properties. We prove some Hermite-Hadamard type integral inequalities for the newly introduced class of functions. We also obtain some refinements of the Hermite-Hadamard inequality for functions whose first derivative in absolute value is inverse trigonometrically convex. Moreover, we proved that Hölder-İşcan and improved power-mean integral inequalities give a better approach than Hölder and power-mean inequalities.
- MakaleAçık Erişim2024Scopus SJRQ1A Multi-response Nonlinear Programming Model with an Inscribed Design to Optimize Bioreduction Conditions of (S)-phenyl (pyridin-2-yl)methanol by Leuconostoc pseudomesenteroides N13
Özdemir, Akın; Şahin, Engin
Asymmetric bioreductions have the potential to synthesize chiral alcohols when catalyzed by biocatalysts. Nevertheless, the (S)-phenyl (pyridin-2-yl)methanol ((S)-2) analgesic synthesis poses significant challenges concerning unsatisfactory substrate amount and production method. Thus, this study proposes an inscribed design-focused multi-response nonlinear optimization model for the asymmetric reduction of the phenyl(pyridin-2-yl)methanone (1) with Leuconostoc pseudomesenteroides N13 biocatalyst. From the novel inscribed design-focused multi-response nonlinear optimization model, optimization conditions of the reaction, such as pH = 6, temperature = 29 °C, incubation time = 53 h, and agitation speed = 153 rpm, were found. Also, the reaction conversion was predicted to be 99%, and the product of the enantiomeric excess (ee) was 98.4% under the obtained optimization conditions. (S)-2 was obtained with 99% ee, 99% conversion, and 98% yield while performing a validation experiment using the determined optimized conditions. In addition, 1 with the amount of 11.9 g was converted entirely to (S)-2 (11.79 g, 98% isolated yield) on a high gram scale. Also, this study is noted as the first example of the gram-scale production of (S)-2 using an optimization strategy and biocatalyst. Further, the applicability of the inscribed design-focused optimization model in biocatalytic reactions has been demonstrated and provides an effective process for the analgesic synthesis of (S)-2, which is a green, cost-effective method of producing chiral aryl heteroaryl methanol.
AtıfScopus3WoS3OpenAlex3İncele - MakaleYalnız künye2023Scopus SJRQ2Ultra-thin reflective multifunctional polarization converter with nested circular ring-shaped metasurface-based for C- and X-band applications
Kaya, Yunus
This article presents a single-layer, ultra-thin and multifunctional polarization converter (PC) design using metasurface. The PC, which is proposed as a single layer, consists of a metal metasurface on the front side of a easily accessible FR-4 material and a metal termination on the back surface. The suggested PC features linear polarization (LP) characteristic within a frequency ranges of 5.21- 5.41 GHz and 7.53- 8.08 GHz in C-band, also 10.59- 10.84 GHz in X-band under normal incidence. It indicates the conversion performance of linear polarization to circular polarization (LP-CP) that has the properties of left-handed circular polarization (LHCP) in frequency range of 5.74–7 GHz in C-band and right-handed circular polarization (RHCP) in frequency range of 8.63- 10.15 GHz in X-band. Besides, the suggested PC provides more than 90% polarization conversion ratio (PCR) value in case of normal incidence (0∘) and over 80% PCR value in case of oblique incidence up to 45∘. Again, the suggested PC offers the same CP feature in two frequency regions where CP conversion takes place under normal incidence for angle of incidence up to 60∘. A prototype of suggested PC was produced, measured, and a good match was found between the results simulated via a commercial electromagnetic (EM) simulation program. Finally, the performance of suggested design is compared with existing studies in literature with its high aspects. In this context, the suggested PC may be useful for C- and X-band applications due to its simple structure, ultra-thin and compactness, low-cost, and performance of LP and CP conversion under wide oblique angles.
AtıfScopus4WoS3OpenAlex3İncele - MakaleAçık Erişim2023Scopus SJRQ1The effect of various industrial dust particles on the performance of photovoltaic panels in Turkey
Güngör, Okan; Kahveci, Hakan; Gökçe, H. Süleyman
The accumulation of dust is one of the main causes of power loss in photovoltaic (PV) farms, and the effect of dust particles’ size and chemistry on system performance is often overlooked. This study has focused on a comprehensive analysis of the effect of different dust particles collected from common industrial production facilities in Turkey on the performance of PV panels in the indoor laboratory environment. The collected dust samples were analyzed to determine the dust sample particles’ chemical properties, size, character, and topography. The data for dust samples at different weights with changes in maximum power point (MPP) of PV panel has been collected using the artificial solar irradiation source system. Thus, the mathematical correlations (R2≥0.965) between the PV panel Thevenin resistance (RTH), fill factor (FF), MPP, and pollution rate were obtained using these collected data and particle swarm optimization (PSO). According to the results of the obtained mathematical correlations, marble dust is 2.3, 3.4, and 4.2 times less polluting than cement, fly ash, and silica fume, respectively. Additionally, it was observed that smaller dust particles block more light than larger ones of the same weight and reduce MPP, FF while increasing the RTH.
AtıfScopus19WoS14OpenAlex21İncele - MakaleYalnız künye2024Scopus SJRQ1Ultrasound assisted choline chloride-based deep eutectic solvent extraction of bioactive compounds from salsify (Tragopogon buphthalmoides (DC.) boiss. Var. Latifolius Boiss.): A Box–Behnken design approach for optimization
Yilmaz, Özlem; Elbir Abca, Tuğba; Kamiloğlu, Aybike; Kutlu, Naciye
This study aimed to investigate the ultrasound-assisted extraction of bioactive compounds from salsify using deep eutectic solvents (DESs) with different molar ratios. For this reason, total phenolic (TPC), total flavonoid (TFC) compounds, and antioxidant activities (1,1-diphenyl-2-picrilhydrazyl radical scavenging activity (DPPH•), and ferric reducing antioxidant power (FRAP)) of extracts prepared with DES were investigated with an experimental design and optimization study conducted for this purpose. An extraction time of 40.15 min was determined as the optimal condition. Under these conditions, a molar ratio of 3:1 (acetic acid:choline chloride) and a water ratio of 42.17 % provided the highest phenolic/flavonoid compounds and antioxidant activity. Correlations between water ratio, molar ratio, and sonication extraction time were determined using principal component analysis (PCA). In conditions where TPC, FRAP, and DPPH• were high according to PCA, it can be concluded that the extraction time, water ratio, and molar ratio are at high levels; contrarily, TFC is at a low level. In conclusion, ultrasound-assisted extraction using DES proved effective for salsify. Therefore, choline chloride-based DESs, can be recommended as environmentally friendly green solvents and an alternative to organic solvents for the extraction of bioactive compounds from salsify.
AtıfScopus11WoS8OpenAlex10İncele - MakaleAçık Erişim2024Scopus SJRQ2Behind the Scenes: A Critical Perspective on GenAI and Open Educational Practices
Aksoy, Dilara Arzugül; Kursun, Engin
Artificial Intelligence (AI) is a rapidly evolving field that is influencing every aspect of life. Generative AI (GenAI) as a sub-branch of AI is used to create content in various formats such as text, images, video, and audio. This paper discusses the implications of GenAI for Open Educational Practices (OEP), highlighting the potential affordances and challenges. GenAI can address the challenges within the OEP by leveraging openness and ethical use. GenAI’s “generative” nature and human-like language capability can provide resources such as course material, activities, examples, questions, assessment, and learning outcomes in the context of OEP. With machine learning and deep learning infrastructure, it can support the discoverability and accessibility of open resources by increasing the metadata quality. GenAI can automatically score student assignments, answer their questions, and provide instant feedback to address the lack of interaction and feedback that arises due to the large number of students, especially in massive open online courses (MOOC). On the other hand, GenAI brings challenges such as data privacy and security, copyright, biased outputs, and the generation of false information. The conclusions emphasize the importance of a nuanced approach that considers not only the advantages but also the risks associated with adopting GenAI in the OEP world. Researching and developing how to apply these technologies to education is important to shape the future of education.
AtıfScopus27WoS18OpenAlex23İncele - MakaleAçık Erişim2024Scopus SJRQ3Notes on the Old Turkish Verb arka- “to seek…” and Its Semantic Field; [ESKİ TÜRKÇE ARKA- “ARAMAK…” FİİLİ VE ANLAM ALANI ÜZERİNE NOTLAR]
Güzel, Ferdi
The verb arka-, whose meaning was only recorded in Old Turkish as “to search, to investigate”, has many unrecorded meanings. Some of these meanings are recorded in later historical and contemporary dialects. Some of them can be identified thanks to the derivatives of the verb. Although the connection between some derivatives of the verb arka- has been mentioned in a few studies, these words have not been associated with each other in most of the studies. According to the data in historical and contemporary dialects, it is understood that the verb arka- has the following meanings: 1. to pass through. 2. to pass between, to extend or place an object between two things. 3. to support, help. 4. to lie diagonally or transversely between two things. 5. to line up in a row. 6. to thread, weave. 7. to send. 8. to follow. 9. to seek, to investigate. The verb arka- is derived from the verb Old Turkish *ar- “to pass through”, with the suffix -kA-, which carries an intensifying function. The core meaning of the verb *ar- and arka- is the same. All meanings of the verb have emerged from the meaning of “to pass through”. It has not been clarified whether the verb ara-, which survives in the Oghuz group Turkish dialects today, and the verb arka- which is recorded as Oghuz in DLT, are the same verb, due to the fact that the *argaintermediate form in the development of arka- > *arga- > ara- has not been detected in any Turkish dialect to date. In addition, in dialects that preserve long vowels, the first vowel of the verb ara- is long, while in derivatives of the verb arka- such as arkış, argaç, the first vowel is short. For these reasons, it does not seem possible to determine with certainty whether the verbs arka- and ara- are the same verb.
- MakaleYalnız künye2024Scopus SJRQ3Boundedness in a attraction-repulsion chemotaxis system with nonlinear production
Ayazoglu, Rabil
We study the quasilinear attraction-repulsion chemotaxis system of parabolic-elliptic type ut = ∆u−χ∇·(u∇υ)+ξ∇·(u∇ω) with nonlinear production 0 = ∆υ −βυ +αus, 0 = ∆ω −δω +γur, subject to the homogeneous Neumann boundary conditions in a bounded domain Ω ⊂ ℝN (N ≥ 3) with smooth boundary. It is proved that for every α, β, δ, γ, χ, ξ > 0 and s ≥ N2,r > N−2/N s, there exists ξ∗ > 0 such that if ξ > ξ∗ and any sufficiently regular initial datum u0(x) ≥ 0, then the model has a unique global classical solution (u, υ, ω), which is bounded in Ω × (0, ∞).
- MakaleYalnız künye2024Scopus SJRQ3Pollen morphology of Eremogone (Caryophyllaceae) in Türkiye
Tokuşoğlu, Kader Varlik; Armağan, Meti̇N; Bülbül, Ali̇ Savaş
The palynological characters of 17 taxa belonging to genus Eremogone Fenzl (Caryophyllaceae) from Türkiye were examined using light microscopy and scanning electron microscopy. Eremogone pollen in Türkiye is found to have an average size of 31.31 μm (26.62‒36.65 μm), pore sizes ranging from 6.52 to 9.24 μm, inter-pore distances ranging from 9.07 to 12.57 μm, pore numbers varying from 5 to 14 and 5‒30 nanoechini distributed in an area of 10 × 10 µm. The ornamentation was identified as nanoperforate, nanoechinate, or nanofaveolate surface elements in various combinations. Clustering analysis and Principal Component Analyses do not show clear groups, although more similar taxa were brought together through the analysis of pollen micromorphological data rather, the nanoechinate base width, nanoechinate length, and pore diameter length are the most valuable variables for separating the examined taxa.
- Derleme MakaleAçık Erişim2022Scopus SJRQ3SARS-CoV-2 Infection and Candidate Biomarkers
Uzunçakmak, Sevgi Karabulut
Severe acute respiratory syndrome coronavirus 2 is a virus that can still infect individuals and whose deadly effects continue despite the current vaccines and drugs. Since 2019, many studies on the pathogenesis of the disease have been completed and continue to be done. In addition to the diagnosis and treatment of the disease, many molecules that can be markers of the disease have been investigated. In the early stages of the pandemic, many nonspecific and infection-related laboratory findings and chest computed tomography were used to obtain information about the diagnosis of the disease. The more individual molecules became associated with the disease yet. The purpose of this review is to summarize the impact and role of many molecules associated with coronavirus disease-2019 infection that have been previously used and newly revealed. Numerous studies are summarized in this review. The obtained data show that previously used laboratory findings and new potential biomarkers are not specific to the disease. New potential biomark-ers have been associated with the severity of the disease itself, as can be seen with lung imaging and even with routine laboratory findings. One of the important points that are seen frequently in studies is that the effectiveness of these molecules has been shown not only in coronavirus disease-2019 infection but also in many other diseases. This removes the pathogenesis of the disease from being a unique mechanism created by the Severe acute respiratory syndrome coronavirus 2 and provides a general perspective formed by viral or bacterial infections. However, there are still many molecular changes that need to be investigated. Future studies will continue to update themselves with the mutations of the virus.
AtıfScopus1WoS1İncele - MakaleAçık Erişim2022Scopus SJRQ1Double adaptive power allocation strategy in electric vehicles with battery/supercapacitor hybrid energy storage system
Çorapsız, Muhammed Reşit; Kahveci, Hakan
This paper proposes a new energy management strategy (EMS) for electric vehicles (EVs) with battery/supercapacitor hybrid energy storage systems (HESS). Firstly, the battery/supercapacitor HESS configuration and obtaining the load current from the driving cycle are comprehensively explained. Secondly, fixed and adaptive frequency-based (AFB) EMS are discussed in detail. In the proposed method, the current demanded by the load is separated into low and high-frequency components with the help of an adaptive low-pass filter (A-LPF). In addition, adaptive battery current (ABC) is generated according to the supercapacitor (SC) state of charge (SoC), and a double adaptive power allocation strategy is performed. The proposed method is compared with the AFB-EMS for load currents, load powers, DC link voltages, filter cut-off frequencies, battery, and SC SoCs on the UDDS driving cycle. When the obtained results were evaluated together, it was observed that the proposed method completed the driving cycle with a higher battery SoC and realized the adaptive cut-off frequency in a narrower band.
AtıfScopus14WoS12OpenAlex14İncele
