Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Uzun, Sevda(77)
- Merdan, Mehmet(73)
- Duran, Celal(54)
- Ozdes, Duygu(50)
- Baltaci, Cemalettin(45)
- Kaygusuz, Abdullah(45)
- Kulakaç, Nurşen(39)
- Ashyralyyev, Charyyar(38)
- Karsli, Orhan(37)
- Demir, Selim(36)
- Öztürk, Serkan(36)
- Dokuz, Abdurrahman(35)
- Turan, Ibrahim(35)
- Araz, Onur(33)
- Kandemir, Raif(31)
- Sipahi, Ferkan(30)
- Topal, Fevzi(30)
- Kurt, Kemal(28)
- Peker, Iskender(28)
- Arslan, Mehmet(27)
- Baltacı, Cemalettin(27)
- Maden, Nafiz(27)
- Ozturk, Samet(27)
- Aydin, Aydanur(26)
- Vural, Alaaddin(26)
- Bayrakdaroglu, Serdar(25)
- Kurnaz, Muammer(25)
- Reis, Hatice Catal(25)
- Akar, Zeynep(24)
- Aydin, Faruk(24)
- Gücer, Mehmet Ali(24)
- Topal, Meryem(24)
- Yolcu, Halil(24)
- Yücel, Cem(24)
- Anaç, Halil(23)
- Kankal, Murat(23)
- Ürkek, Bayram(23)
- Aliyazicioglu, Yuksel(22)
- Günen, Mehmet Akif(22)
- Tuncer, Metin(22)
Yayınlar
- MakaleAçık Erişim2022Scopus SJRQ3The Economic Impacts of Covid-19 on the Forestry Sector: A Case Study in Turkey
Komut, Osman
The Covid 19 pandemic has led to considerable destruction of social and economic areas at a global level. This study aims to determine the economic impact of the Covid 19 pandemic on the Turkish forestry sector. In this context, 5 years (from 2017 to 2021) of wood-based product sales of an administrative unit, which carries out regional forestry activities in Turkey, were studied. The data concerning the product groups were subjected to a Laspeyres price index analysis based on the base period weight through the price and estimated price increase rate variables. In addition, correlation analysis was utilized to determine the relationships between the determined variables. The findings showed that the Covid 19 pandemic led to decreases in the Laspeyres price index values for the price and estimated price increase rates when compared with the pre-pandemic period, which was different on a product group’s basis. As a result, it can be said that the Covid 19 pandemic process created a considerable potential for a loss of income in wood-based products, which is one of the primary outputs of the forestry sector, and as of 2021, a recovery process has started.
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İncele - MakaleYalnız künye2022Scopus SJRQ2Assessment of excavability classification in a Limestone Quarry: A case study from Bayburt, Turkey
Külekçi, Gökhan; Vural, Alaaddin; Aliyazicioğlu, Şener
Excavability is a measure of material which can be excavated with classical excavation equipment. Studies to decide the rock excavability characteristics contribute to the suitability of engineering projects. In this study, a limestone quarry (in Bayburt, Turkey) was analysed with excavability classification systems and appropriate systems were determined. To accomplish this aim, point load index and Schmidt hardness tests were practiced and changed to uniaxial compressive strength tests. After that, findings were categorized with classification systems in excavation and matched against practices from field. In this study, rock mass was addressed as “pre-explosion”, “hard ripping” and “hammer and blasting” in accordance with distinctive classification systems. All determined as rock mass should be blasted for loosening then dug with hydraulic breakers. This practice is totally compatible with in-site excavations fulfilled. According to study results, the most suitable parameters to decide surface excavational classification are load strength index, geological strength index and the degree of rock mass weathering
AtıfScopus3WoS2İncele - MakaleYalnız künye2022Scopus SJRQ2Production of grape pekmez by Ohmic heating-assisted vacuum evaporation
Tunç, Merve Tuçe; Akdoğan, Arda; Baltacı, Cemalettin; Kaya, Zeliha; Odabaş, Halil İbrahim
Pekmez is a concentrated syrup-like food conventionally produced by vacuum evaporation process from sugar-rich fruits. In this study, the applicability of grape pekmez production by ohmic heating assisted vacuum evaporation (ΩVE) method was investigated. Conventional vacuum evaporation (CVE) and ΩVE methods were compared in terms of physicochemical properties, HMF (5-hydroxymethylfurfural) contents, rheological properties, and energy consumptions. ΩVE was run at four different voltage gradients (17.5, 20, 22.5, and 25 V/cm). Total process times for grape pekmez production were determined as 57, 28.5, 32, 39, and 50 minutes for CVE, ΩVE (25 V/cm), ΩVE (22.5 V/cm), ΩVE (20 V/cm) and ΩVE (17.5 V/cm), respectively. Energy consumption of CVE method was higher than ΩVE method for all voltage gradients. Energy efficiency increased as the voltage gradient increased. There was no significant difference between CVE and ΩVE methods for HMF contents. The results show that the ΩVE method could be an alternative to the CVE process for grape pekmez production.
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İncele - MakaleYalnız künye2022Scopus SJRQ4Evaluation of Nutrition Knowledge Levels and Sporting Status of Faculty of Sport Sciences Students
Koçak, Mehmet; Şekeroğlu, Mustafa Önder; Albay, Faruk; Kusan, Osman
Study Objectives: Considering that both physical and psychological effects of nutrition and exercise are important on students, this study aimed to evaluate the nutritional knowledge levels and exercise status of the students of the faculty of sports sciences. Methods: 199 students, 146 (73.4%) male, and 53 (26.6%) female, studying at Sivas Cumhuriyet University Faculty of Sport Sciences participated in the study. The scale consists of 20 items on the “Basic nutrition and food-health relationship” scale, and 12 items on the “Food preference” scale. One-Way Analysis of Variance (ANOVA) and independent t-test were used because the data showed normal distribution. Pearson Correlation test was used to determine the relationship between the nutritional knowledge levels of the individuals participating in the study and the age and bodyweight groups. Results: There was no significant finding when the total points of basic nutrition and food preference were compared according to the regular exercise status of the participants (p>0.05). A significant finding was found when the total scores of basic nutrition and food preference were compared according to the participants’ status of taking nutrition lessons at their schools (p<0.05). Conclusion: In the study, it was revealed that the nutritional knowledge level of the students of the faculty of sports sciences who received nutrition education was sufficient. When the status of doing regular sports is evaluated, it has been revealed that there is no difference between the students who do sports and those who do not, and they have similar nutritional knowledge levels.
- MakaleYalnız künye2022Scopus SJRQ2Chemical profile, antioxidant, antimicrobial, and enzyme inhibition activities of Pilosella hoppeana subsp. cilicica
Acet, Tuba
Pilosella hoppeana subsp. cilicica has been traditionally used for healing many diseases in folk medicine in Anatolia. However, there are, to date, no studies aimed to verify this local usage with scientific data. In the present study, phenolic content and biological activities such as the antioxidant, antimicrobial and enzyme inhibition activities of different extracts of this plant’s aerial part were investigated for the first time. According to the obtained data, the biological activity of methanol extract was found to be significantly higher than the others. Moreover, the major components detected were chlorogenic acid (61.79 mg g−1 extract), apigenin (2.727 mg g−1 extract), and luteolin (1.110 mg g−1 extract) in this extract. This extract showed a strong enzyme inhibitory activity including α-amylase (96.66 mmol ACAE g−1 extract), α-glucosidase (17.27 mmol ACAE g−1 extract), AChE (10.42 mg GALE g−1 extract), and BChE (102.35 mg GALE g−1 extract). On the other hand, the extract exhibited remarkable antimicrobial effect on Yersinia pseudotuberculosis, and Staphylococcus epidermidis (64 µg/mL MIC value); intermediate (128–256 µg/mL MIC value) antimicrobial activity on Proteus vulgaris, Listeria innocua, and vancomycin-resistant Enterococcus faecium. To sum up, it is clearly seen that Pilosella hoppeana subsp. cilicica has significant potential as a source of bioactive compounds in pharmaceutical industries.
AtıfScopus3WoS3OpenAlex5İncele - BildiriAçık Erişim2022Is COVID-19 Friend or Foe to Industry 4.0: Experiences of Turkish White Goods Suppliers
Demirbag, Kubra Simsek; Yildirim, Nihan
This study, in the two years since the beginning of the COVID-19 pandemic, reveals the most focused issues by the Turkish white goods suppliers regarding Industry 4.0 and the challenges encountered while engaging in Industry 4.0 practices. The data were obtained through a questionnaire form participated by the managers of 36 different companies that are members of the Turkish White Goods Suppliers Association. The collected data were classified, and it was found that the most focused issues of the companies were technology investments, ERP and MES, data collection, business processes, investment plans, organizational transformation, occupational health and safety, and participation in Industry 4.0-related events, respectively. Moreover, the most common challenges companies face concerning Industry 4.0 are related to the not being able to come together, finance, technology providers, postponement of investment plans, and loss of employees. On the other hand, 16% of the participating companies stated that they did not encounter any difficulties.
AtıfScopus2OpenAlex2İncele - Derleme MakaleYalnız künye2022Scopus SJRQ3Evaluation of By-Products of Potato Peel as Food Additive
Yuksel, Ferhat; Durmaz, Aysun
The potato plant is an important food source produced all over the world and it provides a significant portion of daily energy intake in nourishment. In addition, a significant rate of vitamins, fibre, mineral matters, protein, and fat can be obtained by consuming potato. In this study, the produc-tion, consumption, and usage areas of potato, a crucial source of our diet, and the possibilities of using it as food additives with the nutritional properties of its peel have been investigated. Generally, potato is consumed after its peel is removed in the homes and industrial areas and many of these peels are disposed off as wastes. Studies show that potato peel has a high content of dietary fibre, protein, car-bohydrate, mineral matters, vitamin, phenolic, and antioxidant. The use of potato peel as food additives have also been discussed in this study.
AtıfScopus3WoS2OpenAlex3İncele - MakaleAçık Erişim2022Scopus SJRQ2Effect of Flaxseed Powder on Physicochemical, Rheological, Microbiological and Sensory Properties of Yoghurt
Kalyas, Alperen; Ürkek, Bayram
In the presented research, five different ratios of flaxseed powder (FSP) (0, 0.25%, 0.50%, 0.75%, and 1%) were used in yoghurt production, and the samples were stored overall 28 days at refrigerator (+4 °C). The effect of FSP and the storage period on acidity, pH, syneresis, water holding capacity, rheological, viscosity, colorimetric, microbiological, and sensory properties of yoghurts were investigated. The acidity, syneresis values of yoghurt samples decreased with the addition of FSP, conversely, the pH, water holding capacity values of the samples increased. The increments in the viscosity (50 and 100 rpm) and consistency coefficient values were observed depending upon the FSP ratio except for the sample containing 1% FSP. All yoghurt samples had pseudoplastic flow behavior. It was determined that the colorimetric parameters of samples changed significantly with the addition of FSP. The L* and white index values of samples containing FSP decreased. Other colorimetric parameters indicated significant differences based on the addition of FSP and storage. The addition of FSP was not caused any negative effect on counts of Lactobacillus bulgaricus and Streptococcus thermophilus. The Lactobacillus bulgaricus, Streptococcus thermophilus and mouldsyeasts counts were consistent with the Codex Alimentarius and the Turkish Food Codex. The sample containing 1% FSP had the lowest evaluation scores in terms of all sensory properties. Therefore, FSP should not use more than 0.75%. Using of the 0.25% FSP in yoghurts could recommend for improve physicochemical, rheological and sensory properties of yoghurts
AtıfScopus13WoS15OpenAlex15İncele - Derleme MakaleAçık Erişim2022Scopus SJRQ4Highly siderophile element and osmium isotope systematics of basaltic volcanics: a different approach to petrological processes
Arslan, Mehmet; Temi̇Zel, İrfan; Abdi̇Oğlu Yazar, Emel; Ar, Bahrican; Yücel, Cem
The highly siderophile element (HSE) or platinum group element (PGE) and Os isotope systematics of basaltic volcanics have recently received a significant attention because of their potential to constrain the petrological processes on magma generation and evolution. The HSE and Os isotope data, which are generally observed at very low concentrations in basalts and obtained by modern enrichment and analytical techniques, are frequently used in petrological studies. The HSE contents and ratios from whole-rock analysis of basalts, and combined evaluation with the theoretical knowledge and modelling of HSE behaviour during the partial melting of mantle and the differentiation of basaltic magma would provide opportunity for geochemical modelling on mantle melting. Besides, HSE contents and Pd-PGE/Ir-PGE ratios are important indicators for the nature of mantle sulfides, the sulfur saturation conditions of the mantle source, sulfide segregation, fractional crystallization, crustal assimilation and partial melting degrees in the origin and evolution of mantle-derived magmas. Therefore, in addition to the traditional whole-rock geochemical data obtained from Cenozoic aged basalts observed widely in Turkey, HSE and Os isotope systematics of these basalts can contribute to define the geochemical features of the mantle source, and to model petrological processes which are effective in the magma evolution.
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İncele - MakaleAçık Erişim2022The Effect of Unemployment and Urbanization on Migration in Turkey: An Evaluation in terms of the Harris-Todaro Model; [Türkiye’de İşsizlik ve Kentleşmenin Göç Üzerindeki Etkisi: Harris-Todaro Modeli Açısından Bir Değerlendirme]
Sancar, Canan; Akbaş, Yusuf Ekrem
This study tested whether there was a relationship between migration, unemployment, and urbanization based on the Harris-Todaro model in 12 regions of Turkey, which were formed according to NUTS-1 classification, in the period between 2008 and 2019. For this purpose, panel data methods that consider cross-section dependency were used in the study. As a result of the analysis, it was concluded that the Harris-Todaro model was valid in TR1, TR2, TR3, TR4, TR5, and TR6 regions. In TR7, TR8, TR9, TRA, TRB, and TRC regions, it was found that the Harris-Todaro model was not valid.
AtıfScopus4WoS3OpenAlex4İncele - MakaleAçık Erişim2022Scopus SJRQ3A MODIFICATION OF APPROXIMATE RANDOM CHARACTERISTICS FOR A MODEL OF ZIKA VIRUS TRANSMISSION
Bekiryazici, Zafer; Kesemen, Tulay; Merdan, Mehmet; Khaniyev, Tahir
In this study, a theoretical model of Zika virus transmission is investigated with random parameters. The parameters of a deterministic model are transformed to random variables to obtain a system of random differential equations. The approximate solutions of the model are analyzed with modified random differential transformation method. It is seen that modified random differential transformation method performs better than random differential transformation method on long time intervals
AtıfOpenAlex1İncele - MakaleYalnız künye2022Scopus SJRQ4DYNAMICAL ANALYSIS OF THE CONFORMABLE FRACTIONAL ORDER HOST-PARASITE MODEL
Şişman, Şeyma; Merdan, Mehmet
In this study, the differential equation system with a mathematical model of parasites is examined in cases where infection does not depend on transmission and defense, but on the level of infectivity and defense of the parasite and host. When discretization is applied to the differential equation, a two-dimensional discrete system is obtained in the range of t ∈ [n, n + 1] then the stability of the Neimark-Sacker bifurcation of the positive equilibrium point of this discrete system is investigated. Finally, MAPLE and MATLAB package program are used to show the accuracy of the results obtained.
- MakaleAçık Erişim2022Scopus SJRQ2Determining the musculoskeletal problems of academicians who transitioned to distance education during the COVID-19 pandemic
Yorulmaz, Deniz S.; Karadeniz, Havva; Duran, Seçil; Çelik, İsa
BACKGROUND: Musculoskeletal disorders are a significant public health issue that negatively affects individuals and society both socially and economically, and increases the cost of care and cure. OBJECTIVE: This study aimed to determine the musculoskeletal problems and risk factors of academicians who transitioned to provide distance education during the COVID-19 pandemic. METHODS: The population of this descriptive cross-sectional study included academicians who worked in two public universities in Turkey. Ethical committee approval and institutional permissions were obtained between 1 and 28 February 2021. Data were collected using a personal information form, the Work Environment Evaluation Questionnaire, and the Musculoskeletal Pain Intensity Assessment Questionnaire. The data were analyzed using the number, percentage, independent group t-test, ANOVA test, and linear regression analysis (forward method). The analysis was interpreted at the 95% confidence level and 0.05 error margin. RESULTS: Of the academicians, 78% were women, 54.6% were married, 80.6% did not regularly exercise, and 73.5% had more workload during the distance education period. Academicians mostly experienced discomfort about their eyes, necks, and waists, and an increase at a significant level was detected in their musculoskeletal system problems during the distance education period. Increasing workload, duration of mobile phone use, active time, having an ergonomic chair, and gender predicted the musculoskeletal system pain intensity by 20%. CONCLUSION: Musculoskeletal system problems are a significant public health issue. Academicians should be informed and consulted for the protection of musculoskeletal system health during the distance education period.
AtıfScopus6WoS7OpenAlex7İncele - MakaleAçık Erişim2022Scopus SJRQ2Investigation of gamma ray absorption levels of composites produced from copper mine tailings, fly ash, and brick dust
Külekçi, Gökhan
To date, heavyweight concretes have been produced from various heavy aggregates as radiation insulation materials, and their gamma ray absorption levels have been investigated. Many of the studies have used heavy aggregates instead of cement or coarse aggregates from composite material components. The present study prepared lightweight concretes using copper mine tailings, clay brick dust, and fly ash instead of fine aggregates. Some mechanical tests (density, compressive strength, and ultrasonic pulse velocity) were performed on composite blocks with dimensions of 5*5*5 cm, and radiation interaction parameters [linear absorption coefficient (cm−1), mass attenuation coefficient (cm2/gr), HVL (half-value layer) (cm), MFP (cm), and permeability (%)] were measured. Radiation interaction parameters were obtained using a HPGe gamma detector. Radiation measurements were performed at five different photon energies: 583 keV (133Ba), 609 keV (133Ba), 662 keV (137Cs), 911 keV (133Ba), 1173 keV (60Co), and 1332 keV (60Co). Additionally, the compressive strength and UPV values of composite materials were associated with their gamma ray permeability. Tests revealed that samples with the addition of copper mine tailings yielded the best energy absorption at all energy levels and that absorption decreased as the energy level increased. For example, with the increasing of the energy level, mass attenuation coefficients decreased. The highest mass attenuation coefficients were obtained as 0.128 cm2/g at an energy level of 583 keV in composites produced from copper mine tailings. On the other hand, it was measured at the same energy level as 0.069 cm2/g (a 46% decrease) in the composites produced with fly ash. In addition, it was observed that fly ash used as a fine aggregate did not have a significant effect on mass attenuation coefficient and could be used as a gamma shield if the material thickness was increased to an average of 14 cm. This study revealed that tailings materials could be used as radiation shields. This study also demonstrated that not using heavy aggregates and producing lightweight concrete in radiation shield production significantly reduced shield production cost.
AtıfScopus10WoS8OpenAlex11İncele - MakaleYalnız künye2022Scopus SJRQ2On the Stability of Parabolic Differential and Difference Equations with a Time-Nonlocal Condition
Ashyralyev, A.; Ashyralyyev, C.
Abstract: In this paper, we study the integral type of the time-nonlocal boundary value problem for a parabolic equation. The well-posedness of these differential and difference problems in Hölder spaces is established. Numerical illustrations in a test case are presented.
AtıfScopus6WoS6OpenAlex8İncele - MakaleAçık Erişim2022Scopus SJRQ2Investigation of natural radionuclide variations and the possible uranium migration by testing with gamma-ray spectrometer: An example from Tuğlu Tepe and Deliler Sites in Şefaatli/Yozgat, Central Anatolia Region, Turkey
Altundaş, Suna
The in-situ gamma-ray spectrometry measurements are performed to define and map natural radionuclide variations and the possible uranium migration on the sandstone in the Central Anatolia Region and Deliler sites in Yozgat, Turkey. The concentrations of radionuclide (eU, eTh, K%) and dose rate values were measured totally on 384 points in both areas with a duration of 5 min at each measurement point. The radionuclide ratios (eTh/K, eU/K, and eU/eTh), geochemical indicators (Ume, F parameter and eU-(eTh/3,5) rate) of uranium remobilization in the rocks, and the hazard parameters were calculated and evaluated by using measured data. The separation of uranium-rich or poor areas was made easily and associated with lithological formations by evaluating all the maps produced together. While the highest concentrations of radionuclide, and dose rate values were recorded in the sandstone units under the cover layer that are Eocene neritic limestones, the lowest concentration values and dose rate were measured on siltstone and claystone in the northern part of the Tuğlu Tepe area. At the Deliler study area, the lower anomaly zones are coincide with the soils used for the cultivation of chickpeas consists of loosely cemented sandy clay siltstone, claystone, gravel, sand, silt, and clay whereas the highest concentrations observed in the outcropped sandstone and limestones. It can be seen that the study areas have variable radioactivity levels as a result of both the weathering from the surrounding granitic rocks and the transport and accumulation of sediments through different factors. On sandstones serving as reservoir rock for uranium mineralization in both Tuğlu Tepe and Deliler sites, there is a uranium migration from the granitic rocks towards these masses and sandstones have been enriched by uranium. As a result of the evaluations, it has been seen that the areas showing uranium enrichment originated from migration can be determined very easily by radioactivity measurements, which is a fast, economical and effective method.
AtıfScopus2WoS1OpenAlex5İncele - MakaleYalnız künye2022Scopus SJRQ1Some physicochemical, color, bioactive and sensory properties of a pestil enriched with wheat, corn and potato flours: An optimization study based on simplex lattice mixture design
Yuksel, Ferhat; Yavuz, Büşra; Baltacı, Cemalettin
In this study, a dried fruit roll up (pestil) was produced by using different concentrations of wheat, corn and potato flours. Simplex lattice mixture design technique was performed to determine the best flour mixture levels. The highest Hydroxymethylfurfural (HMF) was observed in the 13th sample with 6.60 mg/kg; and the lowest was in the 4th sample with 1.42 mg/kg. It was observed that the total phenolic content of the samples varied between 783.0 and 2154.8 mg GAE/kg and this variation was significant (p < 0.05). Significant increases in the antioxidant activities (total antioxidant and DPPH) of the samples were also determined in the pestil samples. Generally, sensory properties of the pestil samples significantly decreased by the increase of potato flour in the mixture and corn and wheat flours exhibited similar sensory properties. The optimum flour mixture was determined according to the sensory analyses, and it was determined that the best pestil formulation can be produced by incorporating 4.69 g wheat flour and 7.39 g corn flour per 100 g.
AtıfScopus13WoS14İncele - MakaleAçık Erişim2022Scopus SJRQ2On the second order of accuracy stable difference scheme for integral type non-local elliptic source identification problem
Ashyralyyev, Charyyar
In this study, a source identification problem for elliptic differential equation with integral type non-local condition is discussed. The second order of accuracy difference scheme for elliptic non-local source identification problem is studied. Using spectral resolution of a self-adjoint operator, stability and coercive stability estimates for solution of difference scheme are established. Subsequently, difference scheme for an approximate solution of multi-dimensional boundary-value problem with integral type non-local and first kind boundary conditions is investigated for stability. Numerical results for 2D and 3D examples are illustrated.
AtıfScopus2WoS1OpenAlex2İncele - MakaleAçık Erişim2022Scopus SJRQ2Petrogenesis of post-collisional Middle Eocene volcanism in the Eastern Pontides (NE, Turkey): Insights from geochemistry, whole-rock Sr-Nd-Pb isotopes, zircon U-Pb and 40Ar-39Ar geochronology
Aydınçakır, Emre; Yücel, Cem; Ruffet, Gilles; Gücer, Mehmet Ali; Akaryalı, Enver; Kaygusuz, Abdullah
The debate about whether Eocene magmatism is considered to be post-collisional or subduction-related or not still continues. Here we offer new 40Ar-39Ar ad U-Pb zircon geochronology, mineral chemistry, bulk rock and Sr-Nd-Pb isotope geochemistry data obtained from the southern dike (SD) suite, in comparison with the northern dike (ND) suite, from the Eastern Pontides. The geochronological data indicate that the SD suite erupted between 45.89 and 45.10 Ma corresponding to the Lutetian (Middle Eocene). The magmas of the ND suite are characterised by slightly more alkaline affinity compared to the SD suite. The trace and rare earth element (REEs) content of the SD suite is characterised by large ion lithophile element (LILEs; Sr, K2O, Ba, Rb) enrichment and depletion of Nb, Ta, and TiO2 elements to different degree with high Th/Yb ratios, which indicate that the magmas forming the SD and ND suites were derived from lithospheric mantle sources enriched by mostly slab-derived fluids in the spinel stability field. The Sr, Nd and Pb radiogenic isotope ratios of the dikes support the view that the magma for the hydrous group (H-SD) was derived from a relatively more enriched mantle source than the other SD and ND suites. The ND suite and the anhydrous group (A-SD) display similar geochemical features characterised by moderate light earth element (LREE)/heavy rare earth element (HREE) ratios, while the H-SD group has respectively lower LREE/HREE ratios indicating higher melting degree. Detailed considerations of the alkalinity, enrichment and partial melting degree for the source of the studied volcanic rocks indicate that the magmas of the northern dike suite are characterised by slightly more alkaline affinity, whereas the magmas throughout the southern dike suite show increments in the enrichment rate and melting degree. In light of the obtained data and comparative interpretations, the geodynamic evolution and differences in petrogenetic character of the Lutetian magmas from both the northern and southern parts of the Eastern Pontides may be explained by different degrees of melting of a net veined mantle source initially metasomatized by mostly subduction fluids during asthenospheric upwelling due to fragmented asymmetric delamination in a post-collisional extensional tectonic environment.
AtıfScopus21WoS20OpenAlex22İncele - MakaleAçık Erişim2022Scopus SJRQ2Neutrosophic QUALIFLEX based on neutrosophic hesitancy index for selecting a potential antivirus mask supplier over COVID-19 pandemic
Şahin, Rıdvan
In order to handle simultaneously the cardinal and ordinal information in decision-making process, QUALIFLEX (QUALItative FLEXible multiple criteria method) is a very well-known decision-making approach. In this work, we extend the classical QUALIFLEX method to neutrosophic environment and develop a neutrosophic QUALIFLEX (N-QUALIFLEX) method that uses the newly defined distance-based comparison approach. It is highly effective in solving multi-criteria decision problems in which both ratings of alternatives on criteria and weights of criteria are single-valued neutrosophic numbers (SVNNs), and their aggregated values are single-valued neutrosophic hesitant fuzzy numbers (SVNHFNs). A neutrosophic hesitancy index (NHI) of a SVNHN is introduced based on degrees of the truth-membership, indeterminacy-membership and falsity-membership, which is used to measure the degree of hesitancy of SVNHN. Considering the NHIS of SVNHFNs, we propose a distance-based comparison approach to determine the magnitude of the SVNHFNs. Then, we apply the comparison approach to define the concordance/discordance index, the weighted concordance/discordance index and the comprehensive concordance/discordance index that are steps of the developed N-QUALIFLEX. By taking all possible permutations of alternatives with respect to the level of concordance/discordance into account, we determine the order of alternatives in final decision. Finally, a practical example on antivirus mask selection over the COVID-19 pandemic is provided to present the effectiveness and applicability of the proposed method, and a comparative study is conducted to show the advantages of the proposed method over other existing methods.
AtıfScopus3WoS2OpenAlex4İncele