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Koleksiyondaki öğeler
- MakaleAçık Erişim2021Scopus SJRQ1Investigation on the properties of new palm-oil-based polyurethane modified bitumen
Vural Kök, Baha; Aydoğmuş, Ercan; Yilmaz, Mehmet; Akpolat, Mustafa
Polyurethane-derived polymer synthesized by the reaction of 4.4′-diphenylmethane diisocyanate (MDI) with the new modified palm-oil-based polyol was used as an alternative additive to thermoplastic-elastomers, such as styrene–butadienestyrene (SBS), the most commonly used additive. The study aimed to investigate the effect of polyurethane (PU) modification on the rheological and chemical structure of base bitumen. The softening point, rotational viscosity, dynamic shear rheometer (DSR), multi-stress creep recovery (MSCR), bending beam rheometer (BBR), and Fourier transform infrared (FTIR) tests were conducted on the binders. The effects of curing time and temperature, isocyanate/hydroxyl (NCO/OH) molar ratio, and PU content were examined and the best modification conditions were determined. It was found that 24 h curing conditions at 85 °C were sufficient for the formation of PU bonds and these processes increased the rutting parameter of the binder by 256% compared to 1 h curing. At 50 °C and a frequency of 5 Hz, the binder with a 4:1 NCO/OH ratio had 63% more complex modulus than the binder with a 10:1 NCO/OH ratio. The 7 wt% PU modified binder had the same performance level as 4% SBS modification and 10 wt% PU modified binder was one degree higher. Moreover, above 60 °C, all the PU modified binders gave lower phase angles compared to the 4% SBS modified binder. 7 wt% PU modified binder showed similar elastic properties against cracks at low temperatures compared to the 4% SBS modified binder. The use of palm oil in the synthesis of PU presents an environmentally friendly and cost-effective solution compared to the use of petrochemical derivatives.
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İncele - MakaleYalnız künye2022Scopus SJRQ2Quality of Life and Perceived Social Support Before and After Sex Reassignment Surgery
Gümüşsoy, Süreyya; Hortu, İsmet; Alp Dal, Nursel; Dönmez, Sevgül; Ergenoğlu, Ahmet Mete
This study aimed to explore the pre- and postoperative differences in quality of life and perceived social support of Female-to-Male transsexual patients who underwent mastectomy and complete hysterectomy. Sixty-three Female-to-Male female individuals who underwent complete hysterectomy and mastectomy between November 2019 and November 2020 were included in this study. Data were collected using the Personal Information Form, Multidimensional Scale of Perceived Social Support, and the World Health Organization Quality of Life Scale Short Form. The pre- and postoperative perceived social support mean scores of patients were 57.2 ± 9.0 and 74.9 ± 7.3, respectively. The pre- and postoperative quality of life mean scores of patients were 76.9 ± 8.3 and 107.8 ± 10.1, respectively. There were statistically significant differences between the measurements (p <.05). In addition, the patients whose education level was primary school, whose income was less than their expenditure, whose father was a primary school graduate, whose family had a strict family opinion on sexuality, whose family had a traditional view, and who had a high body mass index were found to have higher postoperative social support perceptions and quality of life. The patients’ postoperative quality of life and perceived social support improved after sex reassignment surgery.
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İncele - MakaleAçık Erişim2021Scopus SJRQ1A Method to Determine the Most Suitable Initial Conditions of Chaotic Map in Statistical Randomness Applications
Acikkapi, Mehmet Sahin; Ozkaynak, Fatih
The processes and systems in the real world actually contain order and symmetry. Understanding these order and symmetrical behavior has been a common effort of scientists. Chaos theory has been an interesting topic to understand these order and symmetrical behavior. One of the most important reasons for this interest is the rich dynamics of chaotic systems. A remarkable application of these systems is statistical randomness. Especially in random number generator designs based on discrete time chaotic systems, an important design parameter affecting the success of the generator (statistical randomness properties) is the initial conditions of chaotic maps. Obtaining different initial conditions that will meet the statistical requirements is important in terms of generating different random number sequences. In order to determine the initial conditions, an algorithm that updates the initial conditions depending on the number of successful statistical tests is proposed. Although the proposed design approach is similar to a back propagation neural network, it has a unique design approach. The NIST SP 800-22 test suite has been used to analyze the statistical properties of the proposed generator. It is known that the NIST SP 800-22 test suite is a hypothesis test. Therefore, in order to show the success of the proposed method in the best way, various additional analysis studies have been carried out proving that the generator outputs have a uniform distribution. Using the proposed method, six different initial conditions have been determined that provide statistical random properties for the discrete-time chaotic systems known as logistic map and tent map. 1,000,000 bits have been generated using the obtained initial conditions. These bit values are then converted to decimal values between 0-15. It is observed that the obtained numbers have a uniform distribution. These outputs are thought to be applicable in many areas such as games, simulation, modeling, determination of optimization parameters and cryptology. It is shown in a practical application for cryptographic substitution-box designs to examine the success of the outputs.
AtıfScopus34WoS23OpenAlex29İncele - MakaleYalnız künye2021Scopus SJRQ3Determination of the estimated amounts of discarded face masks due to COVID 19 in Turkey
Topal, Murat; Topal, Emine Işıl Arslan
In this study, the estimated amounts of discarded face masks due to COVID 19 were investigated. In this context, the amount of waste face masks was determined separately according to the mask types used (nonwoven, meltblown, and 3-ply, pleated) and the importance of waste face masks was revealed. According to obtained data, the estimated total daily face mask use in Turkey is 72,351,638. The highest amounts of nonwoven, meltblown, and 3-ply face mask waste were determined as 26.88, 36.29, and 43.68 tonnes/day for İstanbul city, respectively. Total amounts of nonwoven, meltblown and 3-ply face mask waste in Turkey were calculated as 144.7, 195.35, and 235.14 tonnes/day, respectively. The top 5 provinces with the highest amount of waste masks are listed as follows; İstanbul (nonwoven=26.88, meltblown=36.29, 3ply=43.68 tonnes/day), Ankara (nonwoven=9.91, meltblown=13.38, 3ply=16.11 tonnes/day), İzmir (nonwoven=7.76, meltblown=10.47, 3ply=12.61 tonnes/day), Bursa (nonwoven=5.40, meltblown=7.29, 3ply=8.78 tonnes/day), and Antalya (nonwoven=4.45, meltblown=6.01, 3ply=7.23 tonnes/day), respectively. In Turkey, 91.3% of medical waste collected in health institutions in 2019 (90,920 tonnes) was sterilized and disposed of in storage areas (83,010 tonnes). 8.7% of medical waste was sent to incineration facilities and disposed (7,910 tonnes). Considering these values, 132, 178.35, and 214.7 tonnes/day of nonwoven, meltblown, and 3-ply face mask wastes can be disposed by sterilization and the remaining 12.7, 17, and 20.44 tonnes/day by incineration, respectively.
AtıfScopus5OpenAlex4İncele - MakaleYalnız künye2021Scopus SJRQ2Alternative α* Parameter Estimation for Simplified Beerkan Infiltration Method to Assess Soil Saturated Hydraulic Conductivity
Yilmaz, D.
Abstract: In situ characterization of the saturated hydraulic conductivity (Ks) requires a large number of experiments, sampling, and laboratory measurements that are time-consuming and expensive. Simplified Beerkan Infiltration (SBI) method was developed to estimate an approximate Ks based on the infiltration curve without any sampling procedures. For that purpose, α* parameter, which is used in the calculation of Ks, was commonly set to a fixed value based on soil texture. This approach was not sufficient for an accurate Ks estimation. For a relatively dry soil, a new approach involving an empirical structural parameter was proposed to calculate an approximation of the α* parameter based on the shape of the steady state asymptote of the Beerkan cumulative infiltration. The new α* parameter was tested on simplified Beerkan infiltration (SBI) method in over 32 Beerkan experiments selected from the Soil World Infiltration Global (SWIG) database. The steady state SBI (SSBI) method estimated Ks with an accuracy close to those estimated with the BEST (Beerkan Estimation Soil Transfer) method. The R2 correlation factor for the SSBI method in Ks estimation with BEST intercept and steady methods were 0.982 and 0.994, respectively. For the transient SBI method, the R2 correlation factors calculated with BEST methods were lower; 0.858 and 0.827, respectively. Therefore, the application of the new α* parameter to the steady state simplified Beerkan approach allows an easy, inexpensive way to estimate accurately Ks.
AtıfScopus6WoS6OpenAlex11İncele - MakaleYalnız künye2022Scopus SJRQ2Linear programming with fuzzy parameters for inventory routing problem in effective management of personal protective equipment: a case study of corona virus disease 2019
Göçmen, Elifcan
Coronavirus disease 2019 (COVID-19) brings about severe disruptions for human living, economics, and environmental balance. This pandemic has boosted the demand for personal protective equipment (PPE) and thus, medical wastes. Thus, a research hypothesis is stated whether it would be possible to provide more efficient distribution and inventory planning to optimize the PPE availability in a fuzzy environment. To confirm the hypothesis, in addition to addressing a scientific novelty considering integration of linear programming with fuzzy parameters, named as the Jimenez’s method and clustering heuristic methods, the practicality of these approaches is provided on a real case study and generated instances from Turkey. The computational results reveal that clustering the 32% of the hospitals ensures optimum total cost and solution time while feasibility degree changes between 0, 4, and 1 values of the Jimenez are not more effective on the results. Improved cost results reveal the economic importance of the healthcare supply chain management and optimal PPE distribution and inventory planning can break down the disease propagation and reduce the detrimental impacts on human life. The proposed approach, for the first time, ensures practical and theoretical insights of distribution and storage decisions across disciplines, namely, engineering and health-care organization authorities.
AtıfScopus19WoS12OpenAlex19İncele - MakaleYalnız künye2021Scopus SJRQ2Radiation shielding and mechanical properties of Bi2O3–Na2O–TiO2–ZnO–TeO2 glass system
Sayyed, M.I.; Askin, Ali; Zaid, M.H.M.; Olukotun, S.F.; Khandaker, Mayeen Uddin; Tishkevich, Daria I.; Bradley, D.A.
Recently, heavy metal oxides (HMO) based glass systems attracted great attention to the scientific community to be used as an alternative to the conventional lead, lead composites and concrete based materials for protection of harmful radiation. In this work, we report the role of Bi2O3 on the mechanical and radiation shielding properties of Bi2O3–ZnO–TiO2–Na2O–TeO2 glass system as well as its mechanical behaviour. The mechanical properties of the glasses were calculated using Makishima-Mackenzie model and different shielding factors have been calculated using Monte Carlo simulation via Geant4 code and also using Phy-X software. The mechanical properties based on Makishima-Mackenzie model depend on the values of packing density (Vi) and dissociation energy (Gi) of the oxide constituents. The simulated values of the mass attenuation coefficient showed a good agreement between both approaches. The mass attenuation coefficient (MAC) at 0.284 MeV of the glass with 5 mol% of Bi2O3 is equal to 0.2083 cm2/g, at 0.662 MeV its equal to 0.0785 cm2/g, while at 1.33 MeV, its MAC is 0.0501 cm2/g. The transmitted percentage of the photons through the proposed glasses was found to rise with increasing the energy of the photon, while decreasing with rising the thickness of the glass sample. The transmission factor (TF) revealed that the greater the thickness of the glass, the lower the TF, and the better the shield. Also, the radiation protection efficiency of the glasses was enhanced with the addition of the Bi2O3. The glass sample with composition of 15Bi2O3–10ZnO–5TiO2–5Na2O–65TeO2 possesses the highest effective atomic number among the studied compositions and showed the lowest half value layer. From the obtained data, Bi2O3 seems to be a strong candidate for enhancing the gamma radiation attenuation factors in the bismuth-based tellurite glasses.
AtıfScopus77OpenAlex78İncele - MakaleYalnız künye2021Scopus SJRQ3Effects of iron powder on properties of geopolymers subjected to different curing regimes
Gulmez, Nihan; Kockal, Niyazi Ugur
Silica fume, slag and iron powder are by-products from various industries. In parallel with development of industrial technology, it is also known that these by-products which cause rapid pollution of the environment are also harmful to human health because they are easily respirable. For this reason, a series of experiments were carried out to determine physical and mechanical properties on samples prepared using different blend designs to examine the effect of factors such as curing conditions, binder type and waste iron powder content. Percentages of iron powder added to replace the aggregate are 10%, 20%, 30% and 40% by volume of slag aggregate. It was observed that the substitution of 30% by volume iron powder instead of slag in geopolymer mortars is the most effective in increasing splitting tensile strength. For 40% partial replacement of fine aggregates with iron powder, increases in compressive strength and flexural strength of slag-based mortars were 7.2% and 43.4%, respectively, compared to mortar without iron powder at 60°C curing conditions.
AtıfScopus4İncele - MakaleYalnız künye2022Scopus SJRQ1The relationship between nurses' professional values and caring behaviors
Basit, Gülden; Erkuş Küçükkelepçe, Gülhan; Arslan Şeker, Sevda
Introduction: Professional values give meaning and direction to clinical practices by providing a philosophical framework for nursing practices. The internalization of professional values is quite effective in providing professional service and is very important in terms of service quality. Design: This descriptive study has been conducted to determine the relationship between nurses' professional values and caring behaviors. Methods: A total of 176 nurses participated who worked in hospitals in this study. The data were collected online using the Nurse Information Form, Nurses Professional Values Scale-Revised (NPVS-R), and Caring Behaviors Assessment Tool Nursing Version-Short Form (CBAN-SF). Data analysis was performed using SPSS software, the Mann–Whitney U test, the Kruskall–Wallis test, and the Spearman correlation coefficient. Results: Of the nurses participating in the study, 66.5% are between the ages of 21–30, 80.7% are female, and 71% are university graduates. No statistically significant difference was found regarding professional values between the mean scores from the NPVS-R and CBAN-SF in terms of the nurses' age, gender, position, working style, clinic at which they work, or their educational status. The nurses scored high on the NPVS-R and CBAN. A moderate, significant, and positive relationship was found between nurses' overall scores on the NPVS-R and CBAN-SF. Conclusion: As nurses' perceptions of professional values increase, their perception toward assessing care behaviors also increases. In addition, a relationship exists between nurses' education levels and assessment of care behaviors and between their work experience and their perceptions of professional values. Conducting studies on the subject using different designs is recommended.
AtıfScopus17WoS17OpenAlex21İncele - Kitap BölümüYalnız künye2021“An International Crossroads of Female Pain”1 Intersectional Feminism: Jackie Kay’s Chiaroscuro
Doğan, Pelin
- MakaleYalnız künye2022Scopus SJRQ3Creating orthophotos with unmanned aerial vehicles and examining its accuracy and usability in geodetic applications
Divit Kadi, Ayse; Gokalp, Ertan; Kadi, Fatih
Unmanned aerial vehicles, one of the technologies that aim to produce data in many scientific studies, has widespread use in many engineering applications, especially in cartography applications. UAV, which can meet the high accuracy required in many studies, offer users the opportunity to produce point cloud and maps for various aims. It is aimed to produce a high-resolution orthophoto map of the study area in this study. In addition, the accuracy of the orthophoto map produced for the areas classified according to topographic structures in the study area has been checked with GNSS measurements, and its compliance with the standards specified in the regulation has been examined. According to the results; Considering the root square mean error values of three axes, it has been searched whether the accuracy values of the products obtained are suitable according to the regulation and it has been determined that these values are within the limits. Then, the application of testing the accuracy of the orthophoto map has been started. When all checkpoints have been examined, the maximum error values in x, y, and h directions have been found to be 5.9, 4.5, and 4.9 cm, respectively.
AtıfScopus1WoS1OpenAlex1İncele - MakaleAçık Erişim2021Scopus SJRQ2Lycopene ameliorates propionic acid-induced autism spectrum disorders by inhibiting inflammation and oxidative stress in rats
Erten, Fusun
This study was conducted to study lycopene efficacy in brain-behavior, pro-inflammatory and apoptotic markers, and antioxidant levels in a rodent model. Rats were administered with propionic acid (PPA) (500 mg/kg BW) to induce autism-like disorders, then treated with different lycopene (L) concentrations (5, 10, 20 mg kg−1 day−1) for 35 days. The groups were: (i);control, (ii);PPA, (iii);PPA + L5, (iv);PPA + L10, and (v);PPA + L20. In this study, serum and brain malondialdehyde (MDA) levels decreased with lycopene supplements compared to the PPA group, similarly to the brain levels of inflammatory factors (IL-1α, IL-8, NF-κB, TNF-α; p <.05). Besides, brain levels of anti-apoptotic Bcl-2 decreased, whereas pro-apoptotic Bax, antioxidant Nrf2, and HO-1 levels in brain increased compared with PPA (p <.05). This study showed that lycopene might have therapeutic value to improve the dysfunctions in learning and memory in a dose-dependent way, along with the antioxidant, anti-inflammatory, and antiapoptotic molecular responses in a rat model of ASD-like disorders. Practical applications: This study suggested that lycopene can reduce propionic acid (PPA)-induced learning and memory impairment and oxidative damage by participating in multiple biological activities such as antioxidant, and anti-inflammatory effects. Lycopene protects serum and brain tissues against PPA induced oxidative damage in rats. These effects may be realized through up-regulation of the brain Nrf2/HO-1 pathway and down-regulation of the IL-1α, IL-8, TNF-α, and NF-κB levels. Lycopene may also contribute to memory and learning function, apoptotic/antiapoptotic modulation, and antioxidant and possible therapeutic efficacy in PPA-induced- Autism spectrum disorder cases.
AtıfScopus26WoS19OpenAlex26İncele - MakaleAçık Erişim2022Scopus SJRQ3Psychometric properties and cultural adaptation of Polish version of Gynecological Cancers Awareness Scale (GCAS)
Nagorska, Malgorzata; Dal, Nursel Alp; Apay, Serap Ejder; Lesinska-Sawicka, Malgorzata; Capik, Canturk
Objectives: Cancer of the female genital organs is one of the most common causes of death of women in Poland. The aim of the study was to translate and analyze the psychometric properties of the Polish version of the Gynecological Cancers Awareness Scale (GCAS). Material and methods: Cross-sectional study and questionnaire technic were used to collect data. The study was conducted from June 10th to July10th 2021 among 443 adult women in Poland. Results: The Cronbach Alpha measure was used to assess the internal consistency of the scale. Cronbach’s Alpha values greater than 0.7 indicates that the scale has high reliability. Conclusions: The analysis confirms that the Polish version of Gynecological Cancers Awareness Scale has a very high reliability to assess the women’s cancers awareness and knowledge of cancers.
AtıfScopus4WoS5İncele - MakaleAçık Erişim2021Scopus SJRQ2In vitro biological activity of Salvia fruticosa Mill. infusion against amyloid β-peptide-induced toxicity and inhibition of GSK-3β, CK-1δ, and BACE-1 enzymes relevant to Alzheimer's disease
Gürbüz, Perihan; Dokumacı, Alim Hüseyin; Gündüz, Miyase Gözde; Perez, Concepcion; Göger, Fatih; Paksoy, Mehmet Yavuz; Yerer, Mükerrem Betül; Ömür Demirezer, L.
Salvia species have been traditionally used to improve cognition and have been proved to be a potential natural treatment for Alzheimer's disease. Salvia fruticosa Mill. (Turkish sage or Greek sage) demonstrated to have anticholinergic effects in vitro. The aim of this study was to understand the mechanism underlying the neuroprotective effects of S. fruticosa infusion and its representative compound rosmarinic acid, which was detected by LC-DAD-ESI-MS/MS. The protective effects of the S. fruticosa infusion (SFINF) and its major substance rosmarinic acid (RA) on amyloid beta 1–42 -induced cytotoxicity on SH-SY5Y cells together with p-GSK-3β activation were investigated. Their in vitro inhibitory effects against glycogen synthase kinase 3β, β-secretase, and casein kinase 1δ enzymes were also evaluated. The results showed that treatment with the all tested concentrations, SFINF significantly decreased Aβ 1–42-induced cytotoxicity and exhibited promising in vitro glycogen synthase kinase 3β inhibitory activity below 10 µg/mL (IC50 6.52 ± 1.14 µg/mL), in addition to β-secretase inhibition (IC50 86 ± 2.9 µg/mL) and casein kinase 1δ inhibition (IC50 121.57 ± 4.00). The SFINF (100 µg/mL and 250 µg/mL) also activated the expression of p-GSK-3β in amyloid beta 1–42 treated SH-SY5Y cells. The outcomes of this study demonstrated that the S. fruticosa infusion possessed activity to prevent amyloid beta 1–42 -induced neurotoxicity and provided proof that its mechanism may involve regulation of p-GSK-3β protein.
AtıfScopus18OpenAlex17İncele - MakaleAçık Erişim2021Scopus SJRQ1Ameliorative effect of Fennel (Foeniculum vulgare) essential oil on chlorpyrifos toxicity in Cyprinus carpio
Pala, Ayşegül; Serdar, Osman; Mişe Yonar, Serpil; Yonar, Muhammet Enis
Chlorpyrifos (CPF) is an organophosphate pesticide that is frequently and widely used to control both agricultural and domestic pests worldwide. In this study, the protective effect of Fennel (Foeniculum vulgare) essential oil (FEO) was investigated in carp (Cyprinus carpio) exposed to CPF. The fish were divided into six groups that one control group (no treatment) and five experimental groups (FEO (3ml/100g diet) group, CPF1 (0.023 mg/l) group CPF2 (0.046 mg/l) group, CPF1 (0.023 mg/l) plus FEO (3ml/100g diet) group, CPF2 (0.046 mg/l) plus FEO (3ml/100g diet) group). Blood and tissue (liver, kidney, gill, and brain) samples were taken from the fish at the end of 14 days of application. Hemoglobin (Hb) level, nitoblue tetrazolium (NBT) activity, and total immunoglobulin (TI) level were measured in blood samples of fish. Acetylcholinesterase (AChE) activity was determined in brain tissue while malondialdehyde (MDA) level, reduced glutathione (GSH) level, catalase (CAT), and glutathione peroxidase (GPx) activity were determined in liver, kidney, and gill tissues. The results showed that there was a significant decrease in Hb level, NBT activity, and TI levels in CPF-treated fish compared to the control group. In addition, increased in MDA levels and significant decreases in GSH level, AChE, CAT, and GPx activities were observed in CPF-treated groups. However, FEO-treated was showed a significant improvement in all parameters except AChE activity compared to CPF groups. These study findings showed that FEO could improve CPF-induced toxicity in C. carpio, except inhibition of AChE activity.
AtıfScopus6WoS6OpenAlex8İncele - MakaleAçık Erişim2022Scopus SJRQ2Comparative karyological analysis of some Turkish Cuscuta L. (Convolvulaceae)
Taşar, Neslihan; Tekbudak, İlhan Kaya; Demir, İbrahim; Açar, Mikail; Kürşat, Murat
This study investigated the somatic chromosome numbers and morphomet-ric properties of 11 different taxa belonging to the genus Cuscuta L., which is one of the parasitic flowering plants and causes significant economic losses on agricultural products. For this purpose, the species were examined karyologically and compared statistically. Belonging to the genus Cuscuta, C. campestris Yunck., C. hyalina Roth, C. kotschyana Boiss., C. babylonica Aucher ex Choisy, C. europaea L., C. kurdica Engelm., C. brevistyla A.Braun ex A.Rich, C. planiflora Ten., C. approximata Bab., C. lupuliformis Krock. C. palaestina Boiss. the chromosome number and morphology of the species were investigated using karyological techniques. Chromosome numbers of the species; C. kotschyana, C. babylonica, C. europaea, C. kurdica, C.planiflora 2n=14; C. campes-tris, C. hyalina, C. approximata, C. lupuliformis, and C. palaestina 2n=28 and C. brevi-styla 2n=42 is determined. Also, the species’ chromosome number, total chromosome length, relative length, arm ratio, centromere index and centromere states, and karyo-type asymmetry values were determined. Chromosome numbers of C. kotschyana and C. kurdica taxa were defined for the first time in this study. Thus, new data on the systematics of these species have been revealed.
AtıfScopus2WoS3OpenAlex3İncele - MakaleAçık Erişim2022Scopus SJRQ2Significance of Free Convection Flow over an Oscillating Inclined Plate Induced by Nanofluid with Porous Medium: The Case of the Prabhakar Fractional Approach
Raza, Ali; Khan, Umair; Eldin, Sayed M.; Alotaibi, Abeer M.; Elattar, Samia; Prasannakumara, Ballajja C.; Akkurt, Nevzat; Abed, Ahmed M.
Given the importance and use of electrically conducted nanofluids, this work aims to examine an engine-oil-based nanofluid including various nanoparticles. In the current study, a fractional model for inspecting the thermal aspect of a Brinkman-type nanofluid, composed of (molybdenum disulfide (MOS2) and graphene oxide (GO) nanoparticles flows on an oscillating infinite inclined plate, which characterizes an asymmetrical fluid flow, heat, and mass transfer. Furthermore, the Newtonian heating effect, magnetic field, and slip boundary conditions were taken into account. The objectives for implementing the Prabhakar-like fractional model are justified because this fractional algorithm has contemporary definitions with no singularity restrictions. Furthermore, the guided fractional model was solved using the Laplace transform and several inverse methods. The obtained symmetrical solutions have been visually analyzed to investigate the physics of several relevant flow parameters on the governed equations. Some exceptional cases for the momentum field are compiled to see the physical analysis of the flowing fluid symmetry. The results show that the thermal enhancement can be progressively improved with the interaction of the molybdenum disulfide-engine oil-based nanofluid suspension, rather than with the graphene oxide mixed nanoparticle fluid. Furthermore, the temperature and momentum profiles enhance due to the factional parameters for molybdenum disulfide and the graphene oxide-engine oil-based nanofluid suspension. This study’s graphical and numerical comparison with the existing literature has shown a very close resemblance with the present work, which provides confidence that the unavailable results are accurate. The results show that an increase improved the heat transmission in the solid nanoparticle volume fractions. In addition, the increment in the mass and heat transfer was analyzed in the numerical evaluation, while the shear stress was enhanced with the enhancement in the Prabhakar fractional parameter α.
AtıfScopus15OpenAlex15İncele - MakaleAçık Erişim2021Scopus SJRQ3Analysis of heavy metal contamination in surface sediments of Iskenderun Bay, Turkey
Kutlu, Banu; Özcan, Tahir; Özcan, Gülnaz
The ecological risk resulting from the accumulation of some heavy metals in the sediments of Iskenderun Bay was assessed using the following measures: enrichment and contamination factor, pollution load index (PLI), and potential ecological risk index (RI). The concentrations of the studied heavy metals were in the following order: Fe > Ni > Mn > Cr > Zn > Cu > As > Pb > Cd > Hg. Ni and As had the highest EF values. This situation is most likely due to the presence of iron, pesticide, and fertilizer plants in the region. According to the United States Environmental Protection Agency, Ni, As, Mn, and Cr may have harmful effects on faunal communities in sediments. According to the RI, Site 4 was more contaminated and toxic than the other seven study sites, with "moderate"ecological risk. Pearson's correlation coefficient was determined by multivariate methods - cluster and principal component analysis. As can be inferred from the RI values, the potential toxic effect of As and Ni in the sediments is moderate.
AtıfScopus7OpenAlex6İncele - MakaleYalnız künye2022Scopus SJRQ2Ohmic heating: A futuristic method for cooking bulgur
Goksu, Ali; Omac, Basri; Sabancı, Serdal
Bulgur is a nutritious, healthy, and partially cooked food product with long shelf life and produced from wheat grains. In the present study, ohmic heating (OH) was used to cook bulgur as an alternative method to conventional cooking in case of bulgur pilaf due to its advantages including shorter heating time, uniform heat distribution in food, and higher energy efficiency. Bulgur was cooked in 0.1% salt solution to evaluate the effect of OH at various voltage gradients (10, 13, 16, and 19 V/cm) and conventional cooking processes on the textural properties of bulgur and energy consumption. The results showed that for the OH process, the total energy consumption for the cooking of bulgur reduced by approximately 80% compared to that for conventional cooking. In addition, the voltage gradients were significantly related to the cooking time, a crucial parameter for the water absorption of bulgur (p < 0.05). Novelty Impact Statement: Pre-cooked bulgur must be cooked in water by using electric or flame equipment before consumption. Nevertheless, in these systems, the cooking process consumes a pretty long time and causes a vast amount of waste energy. Therefore, alternative methods are needed to save time and energy. Thus, the ohmic heating was used as an alternative cooking process for bulgur prior to consumption.
AtıfScopus3WoS3OpenAlex9İncele - MakaleAçık Erişim2021Scopus SJRQ1An effective method to improve nonlinearity value of substitution boxes based on random selection
Artuğer, Fırat; Özkaynak, Fatih
In today's digital society, new design alternatives are needed for substitution box structures, which has critical importance in developing secure information systems that are resistant to algebraic and application attacks, as new attacks negatively affect designs based on mathematical transformations. Although random selection-based substitution box structures are a good alternative against algebraic and application attacks, the low value of nonlinearity criterion is an important problem. Solution suggestions using optimization algorithms have been proposed to address this problem. “Information Sciences 523 (2020) 152–166” is the study that reached the highest nonlinearity value based on optimization algorithms to date. However, the high computational costs of optimization algorithms are another challenge that must be overcome. In this study, it has been shown that the nonlinearity values of random (chaotic) selection substitution box structures can be improved as much as mathematically based designs by using a method that is too simple to compare with optimization algorithms. It has been shown that the nonlinearity value can be improved up to 110 for random selection-based substitution box designs. Although this nonlinearity value is the highest achievable value in the literature based on the random selection principle, the fact that it requires only 2×255×255 processes in the worst case has been evaluated as an important success of the proposed method compared to other design approaches. Other advantages of the proposed method are that the improved substitution box structures are resistant to side-channel attacks, simple structure, easy hardware implementation, and successful results in practical applications such as image encryption. It is believed that all these results will be a motivation for new post-processing techniques to be designed in the future for random selection-based substitution box designs.
AtıfScopus42WoS30OpenAlex42İncele
