Wos İndekslenen Yayınlar

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12597/3196

Browse

Now showing 1 - 20 of 422

3D numerical analysis of a Li-ion battery cooling system with honeycomb configuration in electrical vehicles
(2024.01.01) Nazli, C.; Gürdal, M.; Arslan, K.
This study focuses on the thermal challenges faced by lithium-ion batteries in electric vehicles and the importance of effective thermal management systems. It has been conducted a 3D numerical analysis to investigate the impact of different distances between batteries on heat transfer and flow characteristics in an air-cooled cooling module with an innovative honeycomb configuration. Boundary conditions and the study results were given with dimensionless parameters with longitudinal ratio (x/lambda), distance ratio (lambda), and height ratio (y/H). It was found that smaller distances between batteries let to higher temperatures at the beginning of the cooling channel due to the shorter channel width. However, as the distance between batteries increases, convective heat transfer performance improves, resulting in better temperature distributions and higher Nusselt numbers. The results shed light on the importance of optimizing the spatial arrangement of batteries in a cooling module to achieve efficient thermal management. This research contributes to bridging existing gaps in knowledge regarding battery thermal management in electric vehicles and provides insights for the design and development of more effective cooling strategies for lithium-ion batteries. In conclusion, according to the distance between batteries (S=1-3-5 mm) under a laminar flow regime, the best average Nussell numbers obtained for S=5 mm %17 and %7 heat enchantments compared to other S=1 mm and S=3mm cases, respectively. It can be observed that the convective heat transfer performance is optimal when all cases are located on the 9th battery. After the 9th battery column, the optimal heat transfer performance was observed for a thickness of 5 mm. The S=3 mm case exhibited a 7 % reduction in convective heat transfer performance compared to the S=5 mm case.
A Bibliometric Analysis of Scientific Research in Türkiye on National Parks Between 2002 and 2021
(2024.01.01) Yelsiz, M.S.; Yücedag, C.; Çiçek, N.; Ayan, S.
In Turkiye, national parks play a prominent role among protected areas. Besides meeting people's recreational needs, these protected areas are home to natural and cultural resources. As a result, numerous research has been conducted to find out more about assets and recreational uses of these areas. In this study, the bibliometric analysis method was used to examine research published in Turkiye on national park between 2002 and 2021 within the scope of Clarivate Analytics ' Web of Science (WoS). For this purpose, 156 publications, selected from the WoS database, were analyzed. The year 2017 had the most publications. In addition to T & uuml;rkiye, significant countries in the spatial distribution analysis of national parks included the United States and Italy. About 338 authors in all were included in the author analysis for the publications from national parks. The current study found that 117 different institutions had publications about the national park. The highest number of publications and citations originated from Karadeniz Teknik and Kastamonu Universities, respectively. In this study, the WoS database was used as search engine because it is the most frequently preferred and recognized database, containing all records of high-quality research publications and continuing to be regarded as one of the primary sources of bibliographic information. However, some publications in other databases, such as Scopus and Google Scholar, cannot be overlooked in further research.
A colorimetric immunoassay for the detection of human vascular endothelial growth factor 165 (VEGF165) based on anti-VEGF-iron oxide nanoparticle conjugation
(2024.01.01) Ceylan, H.K.; Kirbay, F.O.; Yazgan, I.; Elibol, M.
Vascular endothelial growth factor (VEGF) is an indispensable element in many physiological processes, while alterations in its level in the circulating system are signs of pathology-associated diseases. Therefore, its precise and selective detection is critical for clinical applications to monitor the progression of the pathology. In this study, an optical immunoassay biosensor was developed as a model study for detecting recombinant VEGF(165). The VEGF(165) sample was purified from recombinant Kluyveromyces lactis GG799 yeast cells. Indirect ELISA was used during the detection, wherein iron oxide nanoparticles (FeNPs) were utilized to obtain optical signals. The FeNPs were synthesized in the presence of lactose p-amino benzoic acid (LpAB). VEGF(165) antibody was conjugated to the LpAB-FeNPs through EDC/NHS chemistry to convert the iron oxide nanoparticles into VEGF(165) specific probes. The specificity of the prepared system was tested in the presence of potential serum-based interferents (i.e., glucose, urea, insulin, C-reactive protein, and serum amyloid A), and validation studies were performed in a simulated serum sample. The proposed immunoassay showed a wide detection range (0.5 to 100 ng/mL) with a detection limit of 0.29 ng/mL. These results show that the developed assay could offer a sensitive, simple, specific, reliable, and high-throughput detection platform that can be used in the clinical diagnostics of VEGF.
A Comparative Study About Physical Properties of Copper Oxide and Zinc Oxide Nanoparticles on Fagus orientalis L. as Bioindicator
(2024.01.01) Isinkaralar, K.; Isinkaralar, O.; Ozel, H.B.; Sevik, H.
Nanoparticles (NPs) have recently begun to be used extensively in many areas of our lives. It is stated that the resulting NPs pollution will affect even the most remote ecosystems on the Earth. Therefore, determining the effects of NPs on diverse ecosystems is a research topic of interest. From this perspective, current researches on NPs affecting forest ecosystems and forest trees are very scarce. The aim of this investigation was to reveal the inhibitory and toxic properties of CuO and ZnO-NPs on oriental beech seed germination parameters and identify the toxic threshold values of CuO and ZnO-NPs. Therefore, the oriental beech (Fagus orientalis L.) seeds obtained from ten populations (P1 to P10) were treated with CuO and ZnO-NPs as single compounds at concentrations of 200, 400, 600, 800 and 1000 mg/L and germination rate (GR), germination percentage (GP), root collar diameter (RCD), plumula length (PL), radicle thickness (RT) and radicle diameter (RD) were determined for 35 days. The water containing CuO-ZnO NPs as a single compound at 1000 mg/L negatively affected all growth in general. The significant decrease in our study occurred at P9. The CuO-ZnO NPs were reduced in GP, RCD, PL, RT, and RD as 3.5-4.2%; 11.2-0.1%; 9.1-36.4%; 23.07-38.46%; and 39.29-17.86%, while GR enhanced as 21.46-20.09%. It was found that water with a low concentration of NP (200 mg/L) is suitable for irrigation of seeds grown in soil media and does not have a significant toxic effect on the growth and uptake of metal ions. The findings and limitations of the present research allow us to assess the feasibility of reusing NP-contaminated water in agriculture. Nevertheless, further research is needed to understand the toxic effects of NP mixtures on growth and absorption mechanisms.
A comparison for thyroid functions and clini-cal features in deficit and non-deficit schizo-phrenia
(2024.01.01) Inaltekin, A.; Tasdelen, Y.
Objective: The primary occurrence and persistence of negative symptoms observed in patients with schizophrenia is deficit syndrome. Although the association between thyroid hormones and schizophrenia symptoms has been reported, no studies have investigated thyroid function in patients with deficit schizophrenia (DS). This study aims to investigate the clinical features and thyroid function in DS patients by comparing them with patients with non-deficit schizophrenia (NDS) and a control group. Method: 33 subjects from DS, 35 subjects from NDS and 35 healthy control subjects were included in the study. Patients with schizophrenia were classified into DS and NDS using the deficit syndrome table. Thyroid function was assessed by the levels of TSH, free T3 (fT3), and free T4 (fT4). Sociodemographic data and clinical characteristics were evaluated using the Sociodemographic Data Form, the Positive Symptoms Evaluation Scale (SAPS), the Negative Results: There was no significant difference between DS and NDS groups in terms of age, gender, marital status and education (p>0.05). The percentage of unemployed was significantly higher in the DS group than in the NDS group (p=0.005). There were 14 (42.4%) suicide attempts in the DS group and 11 (31.4%) in the NDS group, and there was no significant difference between the groups (p>0.05). There was no significant difference between the groups when comparing the thyroid functions of the DS, NDS and healthy control groups regarding fT4, fT3 and TSH (p>0.05). There was no significant correlation between TSH, free T3, free T4 and total SANS, total SAPS and CDSS scores (p>0.05). Discussion: According to our study thyroid function is not different in DS, NDS and healthy controls and is not associated with positive, negative and depressive symptoms in patients with schizophrenia.
A Comprehensive Overview of the Effects of Saffron Extract and Its Ingredients on Neurologic, Diabetes, Cardiovascular and Gastrointestinal Diseases: Biological Studies Using CRISPR-Cas9, Docking, Omics and Bioinformatics Approaches
(2023.01.01) Çeter, T.; Mollaamin, F.; Monajjemi, M.
Although the types of scientific tests used change over time, saffron intake has been found to reduce symptoms of diabetes, cholesterol, Alzheimer's, depression, and many other diseases. The purpose of this study was to provide safe and well-controlled clinical tests to clearly analyze the potential mechanisms of the effects of saffron. Biological markers after saffron use are measured in relationship with the predicted health results, so that the results of various studies can be compared and explicated. Since the natural propagation of saffron does not occur quickly and its corms can be manually dug up, separated and replanted, biotechnological methods can increase the ability to generate large amounts of various saffron compounds, such as crocin, picrocrocin, crocetin and safranal, in vitro. Since pathogenic plants cause crop losses in agriculture environment, Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR)/CRISPR associated protein 9 (Cas9) can help with biotic and abiotic problems via a crop molecular reproduction plan, with improvement of the genes' responses to issues induced through viruses, fungi, and bacteria. Quantitative Structure Activity Relationship (QSAR) methods can be used for determining the maintenance times of ingredients for saffron extract through analyzing solid phase micro-extraction gas chromatography-mass spectrometry (SPMEGC-MS). QSAR is an accurate method for detecting relationships between the molecular properties of chemical reactions and biological systems. Bioinformatics tools can help the mechanism of the transcriptome of saffron based on the structural foundation of the flavor, color biogenesis, genomic establishment and biological gynoecium of saffron. The data extracted from bioinformatics websites can be used for constructing biological routes containing the biosynthesis of main ingredients of saffron, i.e., crocin, crocetin, safranal, picrocrocin. Omics-based technologies have been extensively discussed within biology and can be used for saffron. These studies have given rise to concepts for the better understanding of saffron growth and its therapeutic action. Molecular docking simulation has also been discussed to find the location of safranal inside lysozyme. The interaction of safranal with molecular biology was discussed by mixing approaches including CRISPR/Cas9, docking, bioinformatics and omics. This provides a new approach that is in with the results obtained
A critical ethnography on instructor-student interactions in a mathematics teacher education course
(2023.01.01) Sadak, M.
This study aimed to investigate the instructor-student interactions in a secondary level mathematics teacher education course through a critical ethnographic perspective. Participants in the study were 16 pre-service teachers at one of the large midwestern universities in the U.S. The data for the study consists of the transcribed audio recordings collected in four classroom meetings as well as exclusive field notes. It was revealed as a result of the current study that negotiation - renegotiation mechanisms mediate the communications, which occur in accordance with the lifeworlds of students and instructor while system subordinates the lifeworld of these actors through its two main roots, contractual and normative systemic relationships. In addition, the reflection of these relationships on the instruction was also discussed. It is highly suggested for future researchers to investigate these interactions with extended sample sizes as well as in different learning environments.
A cyber defense system against phishing attacks with deep learning game theory and LSTM-CNN with African vulture optimization algorithm (AVOA)
(2024.01.01) Elberri, M.A.; Tokeser, Ü.; Rahebi, J.; Lopez-Guede, J.M.
Phishing attacks pose a significant threat to online security, utilizing fake websites to steal sensitive user information. Deep learning techniques, particularly convolutional neural networks (CNNs), have emerged as promising tools for detecting phishing attacks. However, traditional CNN-based image classification methods face limitations in effectively identifying fake pages. To address this challenge, we propose an image-based coding approach for detecting phishing attacks using a CNN-LSTM hybrid model. This approach combines SMOTE, an enhanced GAN based on the Autoencoder network, and swarm intelligence algorithms to balance the dataset, select informative features, and generate grayscale images. Experiments on three benchmark datasets demonstrate that the proposed method achieves superior accuracy, precision, and sensitivity compared to other techniques, effectively identifying phishing attacks and enhancing online security.
A data-driven approach to river discharge forecasting in the Himalayan region: Insights from Aglar and Paligaad rivers
(2024.01.01) Kumar, V.; Unal, S.; Bhagat, S.K.; Tiyasha, T.
This study aims to better understand the time series forecasting of Aglar and Paligaad rivers ' discharge (which has a significant impact on the Himalayan river) using advanced time series methods such as Holt -Winters (HW) additive method, Simple exponential smoothing (SES), and Non -seasonal auto -regressive integrated moving average (ARIMA) models. This study used antecedent discharge information to forecast the next event. Comprehensive statistical examinations were conducted and analyzed. The highly stochastic nature of these river discharge trends adds complexity to the forecasting efforts and requires sophisticated modeling techniques that are capable of capturing and interpreting such variability accurately. The models proposed in the current study provide a reliable forecast for the next 15 months using 31 months of recorded river discharge data. The forecast analysis shows that both the HW and non -seasonal ARIMA model results indicate exponential decay for the end of 2016 and early 2017. The HW model shows the best performance in long-term forecasting, indicating a sharp increase in spring and a small increase in discharge during fall months. However, for short-term forecasting, the non-ARIMA model should show more promising results. The results show that the proposed methodologies substantially improve the forecast accuracy of discharge for all consecutive months in perennial rivers. While the study presents promising results for forecasting the Aglar and Paligaad rivers ' discharge, generalizing these findings to other river systems or different geographical regions may be problematic due to varying hydrological characteristics and environmental conditions, which may need further study.
A novel iterative scheme for solving delay differential equations and third order boundary value problems via Green's functions
(2024.01.01) Okeke, G.A.; Udo, A.V.; Alqahtani, R.T.; Kaplan, M.; Ahmed, W.E.
In this paper, we constructed a novel fixed point iterative scheme called the Modified-JK iterative scheme. This iteration process is a modification of the JK iterative scheme. Our scheme converged weakly to the fixed point of a nonexpansive mapping and strongly to the fixed point of a mapping satisfying condition (E). We provided some examples to show that the new scheme converges faster than some existing iterations. Stability and data dependence results were proved for this iteration process. To substantiate our results, we applied our results to solving delay differential equations. Furthermore, the newly introduced scheme was applied in approximating the solution of a class of third order boundary value problems (BVPs) by embedding Green's functions. Moreover, some numerical examples were presented to support the application of our results to BVPs via Green's function. Our results extended and generalized other existing results in literature.
A study on sustainable foam concrete with waste polyester and ceramic powder: Properties and durability
(2024.01.01) Bayraktar, O.Y.; Tunçtan, M.; Benli, A.; Türkel, I.; Kizilay, G.; Kaplan, G.
The textile and apparel sectors currently produce millions of tons of textile waste annually on a global scale. Textile waste fibers are a viable option for sustainability as they can be utilized to reinforce cement-based composites internally by improving ductility and reducing the development of cracks. The issue of ceramic waste accumulation can be effectively resolved by using ceramic waste as supplementary cementitious materials (SCM), for sustainable construction, which also lowers energy use and CO2 emissions during the cement manufacturing process. This study evaluated the fresh, physico-mechanical, durability, and thermal characteristics of foam concrete (FC) reinforced with waste polyester (WP) incorporating waste ceramic powder (CP) as a replacement of cement in the rates of 0, 10 and 20%. Twelve mixtures with a 0.3 water/binder (w/b) ratio were fabricated using a sodium lauryl sulfate foaming agent. The WP used in this study have four percentages of 0, 0.2, 0.4 and 0.6 % by volume. Durability performance of the mixtures for dry shrinkage, sulfate attack, high temperatures, alkali silica reaction and freeze-thaw cycles was also carried out. Microstructure of the mixtures was analyzed by SEM. Cost investigation and environmental impact of FC mixtures were also investigated. The findings indicated that the mixture with 10% CP and 0.6% WP had the largest 28-day compressive strength of 8.78 MPa, representing a 47 % decrease over the reference mixture (without CP and WP). The same mixture also exhibited the lowest dry shrinkage after the reference mixture. The mixture containing 0%CP and 0.2WP had the lowest thermal conductivity with a reduction of 74.0 % as per the reference mixture. The 0.4 % WP and 0%CP incorporated mixture exhibited the best thermal and F-T performance.
A technique of a "lab-on-a-chip" for developing a novel biosensor in viewpoint of health-care (PHC) applications and biological regulator sensors
(2024.01.01) Monajjemi, M.; Mollaamin, F.
PurposeRecently, powerful instruments for biomedical engineering research studies, including disease modeling, drug designing and nano-drug delivering, have been extremely investigated by researchers. Particularly, investigation in various microfluidics techniques and novel biomedical approaches for microfluidic-based substrate have progressed in recent years, and therefore, various cell culture platforms have been manufactured for these types of approaches. These microinstruments, known as tissue chip platforms, mimic in vivo living tissue and exhibit more physiologically similar vitro models of human tissues. Using lab-on-a-chip technologies in vitro cell culturing quickly caused in optimized systems of tissues compared to static culture. These chipsets prepare cell culture media to mimic physiological reactions and behaviors.Design/methodology/approachThe authors used the application of lab chip instruments as a versatile tool for point of health-care (PHC) applications, and the authors applied a current progress in various platforms toward biochip DNA sensors as an alternative to the general bio electrochemical sensors. Basically, optical sensing is related to the intercalation between glass surfaces containing biomolecules with fluorescence and, subsequently, its reflected light that arises from the characteristics of the chemical agents. Recently, various techniques using optical fiber have progressed significantly, and researchers apply highlighted remarks and future perspectives of these kinds of platforms for PHC applications.FindingsThe authors assembled several microfluidic chips through cell culture and immune-fluorescent, as well as using microscopy measurement and image analysis for RNA sequencing. By this work, several chip assemblies were fabricated, and the application of the fluidic routing mechanism enables us to provide chip-to-chip communication with a variety of tissue-on-a-chip. By lab-on-a-chip techniques, the authors exhibited that coating the cell membrane via poly-dopamine and collagen was the best cell membrane coating due to the monolayer growth and differentiation of the cell types during the differentiation period. The authors found the artificial membrane, through coating with Collagen-A, has improved the growth of mouse podocytes cells-5 compared with the fibronectin-coated membrane.Originality/valueThe authors could distinguish the differences across the patient cohort when they used a collagen-coated microfluidic chip. For instance, von Willebrand factor, a blood glycoprotein that promotes hemostasis, can be identified and measured through these type-coated microfluidic chips.
A test of the career construction model of adaptation in a sample of Turkish undergraduate students: a two-wave longitudinal mediation study
(2024.01.01) Kara, A.
This longitudinal study aimed to test the mediating role of career adaptability in the relationship between optimism and subjective well-being. A total of 246 university students formed the final sample. The data were collected using the Optimism Scale, Positive and Negative Affect Schedule, Career Adaptability Scale, and Satisfaction with Life Scale. The data were analyzed using a cross-lagged panel model. A one-unit increase in Optimism Time 1 was related to a unit increase in Career Adaptability Time 2. In addition, a one-unit increase in Career Adaptability at Time 1 was related to a unit increase in Subjective Well-being at Time 2. Cette & eacute;tude longitudinale visait & agrave; tester le r & ocirc;le m & eacute;diateur de l'adaptabilit & eacute; de carri & egrave;re dans la relation entre l'optimisme et le bien-& ecirc;tre subjectif. Deux cent quarante-six & eacute;tudiants universitaires ont constitu & eacute; l'& eacute;chantillon final. Les donn & eacute;es ont & eacute;t & eacute; recueillies & agrave; l'aide de "L'& eacute;chelle d'optimisme, l'& eacute;chelle d'affect positif et n & eacute;gatif, l'& eacute;chelle d'adaptabilit & eacute; de carri & egrave;re et l'& eacute;chelle de satisfaction de vie". Les donn & eacute;es sont analys & eacute;es & agrave; l'aide d'un mod & egrave;le de panel & agrave; d & eacute;calage crois & eacute;. Une augmentation d'une unit & eacute; dans l'Optimisme Temps 1 & eacute;tait li & eacute;e & agrave; une augmentation d'une unit & eacute; dans l'Adaptabilit & eacute; de Carri & egrave;re Temps 2. De plus, une augmentation d'une unit & eacute; dans l'Adaptabilit & eacute; de Carri & egrave;re au Temps 1 & eacute;tait li & eacute;e & agrave; une augmentation d'une unit & eacute; dans le Bien-& ecirc;tre Subjectif au Temps 2. Diese L & auml;ngsschnittstudie zielte darauf ab, die vermittelnde Rolle der beruflichen Anpassungsf & auml;higkeit in der Beziehung zwischen Optimismus und subjektivem Wohlbefinden zu testen. Zweihundertsechsundvierzig Universit & auml;tsstudenten bildeten die endg & uuml;ltige Stichprobe. Die Daten wurden mit Hilfe der "Optimismus-Skala, Skala f & uuml;r positive und negative Affekte, Skala f & uuml;r berufliche Anpassungsf & auml;higkeit und Zufriedenheit mit dem Leben-Skala" erhoben. Die Daten wurden mit einem kreuzverz & ouml;gerten Panelmodell analysiert. Eine Einheitserh & ouml;hung in Optimismus Zeit 1 war mit einer Einheitserh & ouml;hung in beruflicher Anpassungsf & auml;higkeit Zeit 2 verbunden. Dar & uuml;ber hinaus war eine Einheitserh & ouml;hung in der beruflichen Anpassungsf & auml;higkeit zu Zeit 1 mit einer Einheitserh & ouml;hung im subjektiven Wohlbefinden zu Zeit 2 verbunden. Este estudio longitudinal tuvo como objetivo probar el papel mediador de la adaptabilidad profesional en la relaci & oacute;n entre el optimismo y el bienestar subjetivo. En total, 246 estudiantes universitarios conformaron la muestra final. Los datos se recogieron utilizando La Escala de Optimismo, el Programa de Afecto Positivo y Negativo, la Escala de Adaptabilidad Profesional y la Escala de Satisfacci & oacute;n con la Vida. Los datos se analizaron utilizando un modelo de panel con retraso cruzado. Un aumento de una unidad en el Optimismo Tiempo 1 estaba relacionado con un aumento de una unidad en la Adaptabilidad Profesional Tiempo 2. Adem & aacute;s, un aumento de una unidad en la Adaptabilidad Profesional en el Tiempo 1 estaba relacionado con un aumento de una unidad en el Bienestar Subjetivo en el Tiempo 2.
A theoretical study on 1H-indole-2,3-dione complexes with lithium, sodium, and potassium cations
(2024.01.01) Genc, F.; Kandemirli, F.; Dalgic, S.S.
ContextA comparative study of the change in different properties of electronic and structural of the free 1H-indole-2,3-dione molecule and its complexes has been obtained. HOMA analysis was performed to investigate the effects of lithium sodium and potassium cations on the aromaticity of lithium sodium and potassium complexes of 1H-indole-2,3-dione.MethodsSeveral 1H-indole-2,3-dione complexes with lithium, sodium, and potassium cations were optimized at the B3LYP/6-311G(d,p) level. The cation and pi interaction has been investigated from different aspects, including interaction energy calculations, charge transfer values, and changes in the aromaticity of the ring upon complexation. The charge transfer and natural population analysis for the complexes were performed with the natural bond orbital (NBO) analysis. The properties of bond critical points in complexes were studied by applying the quantum theory of atoms in molecules (QTAIM). Finally, the aromaticity change of phenyl induced upon complex formation was evaluated by applying the harmonic oscillator model of aromaticity (HOMA). [Li-INa]+ and [[Li-INb]+ were optimized with the wB97XD function using a version of Grimme's D2 dispersion model, and the absorption energy was compared with the calculation made with the B3LYP functional.
A unique computational investigation of the exact traveling wave solutions for the fractional-order Kaup-Boussinesq and generalized Hirota Satsuma coupled KdV systems arising from water waves and interaction of long waves
(2024.01.01) Wang, X.F.; Yue, X.G.; Kaabar, M.K.A.; Akbulut, A.; Kaplan, M.
A novel technique, named auxiliary equation method, is applied in this research work for obtaining new traveling wave solutions for two interesting proposed systems: the Kaup-Boussinesq system and generalized Hirota-Satsuma coupled KdV system with beta time fractional derivative. Our solutions were obtained using MAPLE software. This technique shows a great potential to be applied in solving various nonlinear fractional differential equations arising from mathematical physics and ocean engineering. Since a standard equation has not been used as an auxiliary equation for this technique, different and novel solutions are obtained via this technique.
Accumulation analysis and overall measurement to represent airborne toxic metals with passive tree bark biomonitoring technique in urban areas
(2024.01.01) Isinkaralar, K.; Isinkaralar, O.; Koc, I.; Cobanoglu, H.; Canturk, U
Authorities have long proved the utility of bioindicators in monitoring the state of environmental pollution. Some biological indicators can measure environmental pollutant levels, and many tree species have been tested for suitability for monitoring purposes. The differences in morphological characteristics in the trees have demonstrated the effects of human activities on different materials. Measuring bark and wood biomass from contaminated sites was identified and directly compared with those from a clean site or areas characterized by distinct contamination sources. However, preliminary results demonstrate the approach's potential in the realization of strategies for disease control and promoting health to reduce environmental and health inequalities in at-risk urban areas. Picea orientalis L. and Cedrus atlantica Endl., especially their bark, can be regarded as a more robust storage of Cu (37.95 mg/kg) and Mn (188.25 mg/kg) than Pinus pinaster, Cupressus arizonica, and Pseudotsuga menziesii, which and is therefore a better bioindicator for Cu and Mn pollution. Considering the total concentrations as a result of the study, the pollution is thought to be caused by environmental problems and traffic in the region. The deposition of Cu, Mn, Ni, and Zn elements was found P. menziesii (60, 443, 58, and 258 mg/kg) and P. orientalis (76, 1684, 41, and 378 mg/kg) and seems to reflect atmospheric quite clearly compared to P. pinaster, C. arizonica, and C. atlantica. Ni and Zn concentrations have significantly increased since 1983, and P. menziesii and P. orientalis can be potentially valuable bioindicators for emphasizing polluted fields.
Adsorption ability of Ga5N10 nanomaterial for removing metal ions contamination from drinking water by DFT
(2024.01.01) Mollaamin, F.; Monajjemi, M.
The electronic, magnetic, and thermodynamic properties of alkali/alkaline earth metal ion-adsorbed gallium nitride nanocage (Ga5N10_NC) have been investigated using density functional theory. The results denote that alkali/alkaline earth-metal ion-adsorbed Ga5N10_NC systems are stable compounds, with the most stable adsorption site being the center of the cage ring. The partial density of states (PDOS) can estimate a certain charge assembly between Li+, Na+, K+/ Be2+, Mg2+, Ca2+ and Ga5N10_NC which indicate the complex dominant of metallic features as: Ca2+ > Mg2+ > Be2+ >> K+ > Na+ > Li+. For confirmation of magnetic-alignment of Ga5N10_NC, monovalent (M+) and divalent (M2+) metal ions were added to the sample to measure the effects of metals on the magnetic-alignment properties of Ga5N10_NC. Furthermore, the reported results of NMR spectroscopy have exhibited that both M+ and M2+ can be optimized to achieve optimal alignment of nanocage in the presence of an applied magnetic field; however, chemical shift anisotropy spans for Ca2+- and Mg2+-containing samples is due to Ca2+ and Mg2+ ions binding to Ga5N10_NC. Regarding IR spectroscopy, Li+@ Ga5N10_NC and Be2+@ Ga5N10_NC with more electronegativity appear the most fluctuations through adsorption process. Moreover, based on NQR analysis, Ca2+ has shown a different graph of electric potential during trapping in Ga5N10_NC compared to other metal cations. Based on the results of triangle G(R)(0) amounts in this research, the selectivity of metal ion adsorption by gallium nitride nanocage (ion sensor) has been approved as: K+>Na+> Li+ in alkali metals and Ca2+>Mg2+> Be2+ in alkaline earth metals.
Adsorption effectiveness and properties of an enriched activated carbon from residual biomass materials for non-polar benzene in gaseous environment
(2024.01.01) Isinkaralar, K.; Turkyilmaz, A.; Hosseini-Bandegharaei, A.; Prakash, C.
During the last century, benzene (C6H6) has been a highly studied substance, with some acute and chronic exposures leading directly to hematologic effects detected in humans. This work reports on preparing and examining biomass-derived activated carbons (HPACs) featuring high benzene adsorptive capacity. The fundamental goal of this paper is to propose a green approach for generating HPACs from Heracleum platytaenium Boiss. (Cow parsnip) as woody biomass using a low-cost approach. The characterization showed that chemical activation elicits more enhanced mesoporous structure, a higher degree of graphitization, and bulk porous structure with higher specific surface area and pore volume. To minimize the use of chemicals in the manufacture of high-performance HPACs, an essential pre-pyrolysis step was implemented prior to the chemical activation of biomass by NaOH. The samples were carbonized at different temperatures (500-900 degrees C) and named as HPAC500, HPAC600, HPAC700, HPAC800, and HPAC900. Considering micropore volume and total surface area, HPAC600 was superior, and maximum benzene adsorption capacities were: HPAC600 (127 mg/g) > HPAC700 (117 mg/g) > HPAC800 (101 mg/g) > HPAC500 (80 mg/g) > HPAC900 (59 mg/g) at selected conditions. Freundlich, Langmuir, and pseudo-first-order (PFO) and pseudo-second-order (PSO) models were used to mathematically describe HPAC600-vapor benzene sorption on HPAC600. The kinetic findings fitted PFO with optimal values of R-2 = 0.999, and the isotherm model adsorption fitted Freundlich model (R-2 = 1.000). The finding revealed that H. platytaenium is a useful material for producing adsorbents, and successful testing outcomes demonstrate that H. platytaenium products serve as a suitable benzene absorbent.
Adsorption of gas-styrene on activated carbon from agro-waste of Silybum marianum L. as a sustainable precursor
(2023.01.01) Isinkaralar, K.; Mamyrbayeva, K.; Hosseini-Bandegharaei, A.
Styrene adsorption has always been a research focus in the field of the gas environment due to its widespread usage. Removal of styrene using activated carbon has been verified because of the physicochemical properties of SMACs prepared by activating Silybum marianum L. waste powder. Hence, a series of novel SMACs were synthesized from NaOH, KOH, and H3PO4 ratio of 1:1-5 w/w and pyrolyzing at 450-950 degrees C and then washed activated carbon with HCl and NaOH. SMAC82, SMAC137, and the optimal AC (SMAC249) had the largest styrene adsorption capacity, 229, 170, and 136 mg/g for 700 ppm of styrene. Styrene is a typical model for volatile organic compounds (VOCs) in the atmosphere, and the findings demonstrated that it is rapidly absorbed into SMAC82, SMAC137, and SMAC249 through strong physical sorption. The calculated adsorption amounts showed that the styrene capture processes were feasible for adsorption within a suitable contact time and with excellent equilibrium adsorption capacities. Also, the results showed that the highest removal efficiency at 25 degrees C by the adsorption of SMAC82, SMAC137, and SMAC249 was 92%, 88%, and 86%, respectively. The efficiency results of SMAC82, SMAC137, and SMAC249 show that the styrene breakthrough at 25 degrees C compared to that of 35 and 45 degrees C increases approximately two times. Overall, this SMAC82 presented an excellent separation performance for styrene removal and can be a potential option for industrial applications of other VOCs in gas-phase, indicating good adsorption ability.
Adsorption of gaseous naphthalene on carbonaceous sorbent: perspective of affecting factors
(2023.01.01) Isinkaralar, K.
The innovative and sustainable adsorption technologies for gas phase naphthalene (GPNAP) have attracted attention as a successful method. To remove polycyclic aromatic hydrocarbons effectively, biomass-based activated carbon was produced by chemical activation. The adsorption behavior of naphthalene onto produced activated carbon was also investigated by the BET-specific surface areas, total pore volumes, and average pore sizes. The resulting DCAC800 has successfully prepared a very high surface area (607.5 m(2)/g) by the weight ratio of 1:3 as the H2SO4 activation agent and the pyrolysis of the resultant material at 800 degrees C under an N-2 atmosphere. It has been determined that when the humidity in the environment is increased from 30 to 90% RH, it causes a loss of efficiency between 64-71% for DCAC500, DCAC600 DCAC700 DCAC800, and DCAC900. The adsorption experiments at 30% RH showed that the DCAC800 had a strong adsorption affinity to naphthalene and the maximum adsorption amount was shown to reach up to 296 mg/g in a fixed-bed reactor.

Browse

Browsing by Rights "info:eu-repo/semantics/openAccess"