Web of Science ve Scopus Atıf Dizinlerindeki Yayınlar

Bu koleksiyon için kalıcı URI

https://hdl.handle.net/11363/38

Web of Science ve Scopus Atıf Dizinlerindeki Yayınlar / Publications in Web of Science and Scopus Citation Indexes

Listeleniyor 1 - 20 / 37

Do Employees in Turkey Intend to Telework After the Pandemic?
(Istanbul Univ, Sch Business, 2023) Bicici, Demet Ozcan; Ozcelik, Ayse Oya
Most employees in Turkey have become familiar with teleworking during the pandemic. This study aims to find the Turkish employees' motivation and commitment levels regarding their intention to telework after the pandemic. The mixed method of research with an exploratory sequential strategy with QUAL -> QUAN design was used to explore and explain the motivation and commitment factors regarding the intention to telework after the pandemic in Turkey and to develop a scale. Grounded theory, exploratory factor analysis, one-way ANOVA, and independent samples t-tests were used. The results indicated that age groups affected the motivation and commitment and extrinsic motivation regarding the intention to telework after the pandemic, and education levels affected the general motivation and commitment and intrinsic motivation. As education and teleworking experience levels increased, motivation and commitment and intrinsic motivation regarding the intention to telework after the pandemic increased. Motivation and commitment and intrinsic motivation levels of the employees of companies applying teleworking systematically were higher than the employees who teleworked compulsorily during the pandemic without an adaptation process. Women's extrinsic motivation regarding the intention to telework after the pandemic was higher than men's. The motivation and commitment levels of teleworkers were significantly higher than those of non-teleworkers. The data strongly suggested that childless participants had significantly higher motivation and commitment and intrinsic motivation regarding the intention to telework after the pandemic compared to the parent participants.
The signifcance, potential and the current use of renewable energy in TR83 region, Türkiye
(SPRINGER, ONE NEW YORK PLAZA, SUITE 4600 , NEW YORK, NY 10004, UNITED STATES, 2024) Aykut, Ercan; Dursun, Bahtiyar
This study aims to present the potential of hydroelectric, wind, solar and biomass sources of the TR83 Region which ensures the sustainability and security of the supply. Besides, it reduces the environmental pollution and greenhouse gas emission in the atmosphere. The study demonstrates the present use of both renewable and nonrenewable energy sources together with the plants that will be under construction in the future in the TR83 Region, consisting of the cities Amasya, Tokat, Çorum and Samsun in mid black sea region in Türkiye, also shows the potential of GHG emission reduction together with the present and estimated values. Furthermore, this study proposes to increase the public awareness about the usage of the current potential of the sources and encourages the investors to make investments in the region.
Characterization of Proteins Extracted from Ulva sp., Padina sp., and Laurencia sp. Macroalgae Using Green Technology: Effect of In Vitro Digestion on Antioxidant and ACE‑I Inhibitory Activity
(AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036, 2023) Şensu, Eda; Ayar, Eda Nur; Okudan, Emine Şükran; Özçelik, Beraat; Yücetepe, Aysun
Macroalgal proteins were extracted from Ulva rigida (URPE) (green), Padina pavonica (PPPE) (brown), and Laurencia obtusa (LOPE) (red) using ultrasound-assisted enzymatic extraction, which is one of the green extraction technologies. Techno-functional, characteristic, and digestibility properties, and biological activities including antioxidant (AOA) and angiotensin-I converting enzyme (ACE-I) inhibitory activities were also investigated. According to the results, the extraction yield (EY) (94.74%) was detected in the extraction of L. obtusa, followed by U. rigida and P. pavonica. PPPE showed the highest ACE-I inhibitory activity before in vitro digestion. In contrast to PPPE, LOPE (20.90 ± 0.00%) and URPE (20.20 ± 0.00%) showed higher ACE-I inhibitory activity after in vitro digestion. The highest total phenolic content (TPC) (77.86 ± 1.00 mg GAE/g) was determined in LOPE. On the other hand, the highest AOACUPRAC (74.69 ± 1.78 mg TE/g) and AOAABTS (251.29 ± 5.0 mg TE/g) were detected in PPPE. After in vitro digestion, LOPE had the highest TPC (22.11 ± 2.18 mg GAE/g), AOACUPRAC (8.41 ± 0.06 mg TE/g), and AOAABTS (88.32 ± 0.65 mg TE/g) (p < 0.05). In vitro protein digestibility of three macroalgal protein extracts ranged from 84.35 ± 2.01% to 94.09 ± 0.00% (p < 0.05). Three macroalgae showed high oil holding capacity (OHC), especially PPPE (410.13 ± 16.37%) (p < 0.05), but they showed minimum foaming and emulsifying properties. The quality of the extracted macroalgal proteins was assessed using FTIR, SDSPAGE, and DSC analyses. According to our findings, the method applied for macroalgal protein extraction could have a potential the promise of ultrasonication application as an environmentally friendly technology for food industry. Moreover, URPE, PPPE, and LOPE from sustainable sources may be attractive in terms of nourishment for people because of their digestibility, antioxidant properties, and ACE-I inhibitory activities.
Implementation of Content and Language Integrated Learning and Its Effects on Student Motivation
(UNIV SABANA, FAC ENFERMARIA, CAMPUS UNIV PUENTE COMUN, KM 21 AUTOPISTA NORTE BOGOTA, D C, CHIA, CUNDINAMARCA 00000, COLOMBIA, 2018) Mede, Enisa; Çınar, Senanur
The aim of the present study is to examine the effects of integrating Content and Language Integrated Learning (CLIL) on the motivation of students learning English in a preparatory school at a private university in Istanbul, Turkey. The study also attempts to find out how the students and their instructor perceive teaching and learning English through this particular approach. The participants consisted of 19 intermediate level students and their instructor. To meet these objectives, the quantitative data were collected through pre- and post-motivation questionnaires whereas the qualitative data came from reflective journals kept by the two CLIL had a positive influence on the students’ motivation while learning English. In addition, the reflective journals suggested that both students and their instructor perceived CLIL as an engaging and functional instructional tool while teaching and learning English. CLIL also helped students to become more responsible for their own learning process. Finally, the two groups of participants shared the difficulties they experienced with this approach, such as timing, workload and speaking. Based on these findings, the study offers recommendations and implications about using CLIL in English classrooms.
Use of artificial neural networks in architecture: determining the architectural style of a building with a convolutional neural networks
(SPRINGER LONDON LTD236 GRAYS INN RD, 6TH FLOOR, LONDON WC1X 8HL, ENGLAND, 2024) Cantemir, Ece; Kandemir, Özlem
The discussion of ‘‘can machines think?’’ which started with the invention of the modern computer, brought along the question of ‘‘can machines design?’’ by researchers in the design field. These developments in information technologies have also affected the architecture. Artificial intelligence applications are encountered in many areas such as pricing estimation, energy conservation security systems of buildings, ventilation systems, user-oriented interactive design solutions, computer-aided programs used in the plan production phase and design process. When the literature on artificial intelligence applications in the architecture is reviewed, it can be seen that it generally includes shape grammars, graph theory, decision trees, constraint-based models, machine learning methods, RNN (Recursive Neural Networks), CNN (Convolutional Neural Network) and GAN (Generative Adversarial Network) algorithms. In this study, the use of artificial intelligence algorithms in architecture was examined, and an example was designed to determine the architectural structures of different periods by using CNN (Convolutional Neural Network). In the study, the open source TensorFlow library developed by Google and the Python programming language were used. Employing a statistical approach and utilizing convolutional neural networks (CNNs), a study has successfully classified the current flow patterns of buildings based on datasets comprising facades of Gothic, Modern, and Deconstructivist architectural styles. The findings demonstrate the efficacy of CNNs in accurately distinguishing the intricate details of diverse architectural styles. Recognizing elements from different periods using the CNN algorithm can examine not only individual buildings but also the relationship of buildings with their environments. It can also gain an important place in the field of conservation of the architectural discipline. The historical processes, aesthetic features and changes of protected buildings can be learned with the CNN algorithm and can guide restoration decisions. As a result of the study, the employed CNN-based model can correctly classify structures with 84.66% accuracy rate.
Characterization of chemical, molecular, thermal and rheological properties of medlar pectin extracted at optimum conditions as determined by BoxBehnken and ANFIS models
(ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND, 2019) Al-Amoudi, Rami H.; Taylan, Osman; Kutlu, Gözde; Muslu Can, Aslı; Sağdıç, Osman; Dertli, Enes; Yılmaz, Mustafa Tahsin
In this work, response surface methodology and adaptive neuro-fuzzy inference system approaches were used to predict and model effect of extraction conditions of pectin from medlar fruit (Mespilus germanica L.). The pectin extracted at optimized conditions (89 °C, 4.83 h and 4.2 pH) could be classified as high methoxyl pectin. Sugar composition analysis showed that pectin was mainly composed of D-galacturonic acid, L-arabinose, L-rhamnose, D-galactose and D-glucose. Fourier Transform Infrared Spectroscopy, RAMAN and nuclear magnetic resonance spectra confirmed molecular structure, revealing presence of D-galacturonic acid backbone. X-ray diffraction patterns revealed an amorphous structure. Differential scanning calorimetry showed endothermic (123 °C) and exothermic peaks (192 °C). Thermogravimetric analysis revealed three decomposition regions, 50–225 °C, 225–400 °C and 400–600 °C. Steady and dynamic shear analyses revealed that pectin had a pseudo-plastic behavior with storage (G?) and loss (G?) modulus increasing with increment in frequency, indicating viscoelastic structure more predominantly elastic than viscous.
The effect of flours of different immature cereal grains on sourdough and sourdough bread: Microbiological, rheological, textural and sugar profiles
(WILEY, 111 RIVER ST, HOBOKEN 07030-5774, NJ, 2022) Alkay, Zühal; Yılmaz, Mustafa Tahsin; Muslu Can, Aslı; İspirli, Hümeyra; Dertli, Enes
In this study, the utilization of LAB (Lactiplantibacillus plantarum, Levilactobacillus brevis, Furfurilactobacillus rossiae, Weissella cibaria) cultures with selected flours of different immature cereal grains (wheat, barley, oat and rye) on sourdough and sourdough bread was investigated. In total, 16 different sourdough breads were produced and microbiological, pH, TTA and rheological properties of sourdoughs at 0, 8 and 24?h were determined. At the beginning of the fermentation, while sourdoughs showed elasticity, they showed viscoelastic properties after 24?h of fermentation. The sugar profile of cereal grains at the stage of milk formation and the sugar groups presented in EPSs isolated from sourdoughs were revealed by HPLC analysis. The sugar groups in sourdoughs were glucose, xylose and arabinose, while the sugars in the immature cereal grains were glucose, fructose and mannose. The highest EPS production level (1882.69?±?8.16) was observed in immature barley flour and Lpb. plantarum containing sourdough and all sourdoughs were found to contain glucan type EPSs. It was observed that the amount of EPS produced by the related species differed significantly under different grain conditions. Besides, it was observed that the sourdough breads produced were harder than the control bread. Novelty Impact Statement: Wheat, barley, oat and rye immature grains and four distinct LAB strains were used during sourdough fermentation. Immature grain type and LAB strain used were determinants for in situ exopolysaccharide (EPS) production. Viscoelastic properties of sourdough and textural properties of sourdough bread were affected by grains and LAB strain utilized.
Ultrasound-assisted enzymatic extraction of proteins from Gracilaria dura: Investigation of antioxidant activity and techno-functional properties
(WILEY, 111 RIVER ST, HOBOKEN 07030-5774, NJ, 2022) Bozdemir, Ayşegül; Şensu, Eda; Okudan, Emine Şükran; Özçelik, Beraat; Yücetepe, Aysun
In this study, ultrasound-assisted enzymatic extraction was performed to extract proteins from Gracilaria dura for the first time. The ultrasonic applying time (30–300?s), enzyme/substrate (E/S, 0.5–2.5), and extraction time (20–28?h) on protein content (PC), total phenolic content (TPC), and antioxidant activity (AOA) was optimized using response surface methodology. Techno-functional properties of protein extracts obtained under optimum conditions were determined. At optimum conditions (ultrasonic applying time: 257.57?s, E/S: 2.5, extraction time: 22.61?h), PC, TPC, AOACUPRAC and AOAABTS were found as 189.59?mg/g, 60.52?mg GAE/g and 55.66?mg TE/g and 478.50?mg TE/g dw, respectively. The water/oil absorption capacity, foaming capacity/stability, emulsifying activity/stability of the protein extracts were 195?±?0.08%, 568?±?0.10%, 12.5?±?0.00%, 0%, 44?±?0.00%, and 75?±?2.50%, respectively. In conclusion, G. dura protein extracts may have an important potential to improve antioxidant activity and functional properties of various food products due to high antioxidant activity and a good level of water/oil absorption capacity. Novelty impact statement: Macroalgae Gracilaria dura proteins were successfully extracted with high extraction efficiency by extraction process performed with ultrasonication application and enzyme usage. The protein extracts from G. dura can be used to improve the techno-functional and antioxidative properties of various food products due to their acceptable water/oil absorption capacity and emulsifying properties and high antioxidant activity.
Deep Learning and Internet of Things (IoT) Based Monitoring System for Miners
(PLEIADES PUBLISHING INC, PLEIADES HOUSE, 7 W 54 ST, NEW YORK, NY 10019, UNITED STATES, 2022) Saray Çetinkaya, Tuğba; Senan, Sibel; Orman, Zeynep
In this study, a miner monitoring system is designed using the Deep Learning (DL) approach and the IoT technology together. It is aimed to determine the area where the miners are located while a possible accident occurs by the proposed system. Experiments were carried out to analyze the effectiveness of the proposed system and the performance evaluations were made. The best result was obtained with an accuracy rate of 97.14%. This rate indicates that the designed miner monitoring system can be used effectively in practice.
Gelir Gruplarına Göre Tüketici Fiyat Endeksi (TÜFE) Hesapları ve Gelir Dağılımı Ölçümü İçin Yeni Bir Öneri
(ISTANBUL UNIV, METHODOLOGY & SOCIOLOGY RESEARCH CENTER, CENTRAL CAMPUS, ISTANBUL 34452, TURKEY, 2022) Daşdemir, Esat
Bu çalışma gelir gruplarına göre tüketici fiyat endeksi (TÜFE) hesaplanması konusunu incelemektedir. Tüketim alışkanlıklarının en büyük belirleyicilerinden biri gelir düzeyidir. Dolayısıyla gelir düzeyine göre bireylerin tüketici mal sepetleri de değişmektedir. Bu bağlamda gelir düzeylerine göre bireylerin karşılaştığı enflasyon oranları farklılık gösterir. Çalışma kapsamında Türkiye Cumhuriyeti ölçeğinde 2006-2021 yılları arasında gelir düzeyi düşük bireylerin daha yüksek enflasyon oranlarıyla karşılaştığı gözlemlenmiştir. Düşük gelir grubunda bulunan bireyler, yüksek gelir grubunda bulunan bireylere göre daha yüksek enflasyon oranları ile karşılaşmaktadır. Bu nedenle gelir düzeyi aynı kalsa dahi, gruplar arası enflasyon farklılığı nedeniyle düşük gelirli gruplar ile yüksek gelirli gruplar arasındaki yaşam standardı farklılığı açılmıştır. Sosyal politikaların planlanması aşamasında gelir dağılımının tespiti ve gelir eşitsizliği önemli bir yer tutmaktadır. Bu nedenle çalışma kapsamında gelir dağılımı analizlerine alım gücündeki değişmelerin dâhil edilmesi önerilmiştir. Bu çalışma Gini katsayısına atıf yapılarak gelir dağılımı hesabında alternatif bir yöntem geliştirilmiştir. Bu yöntemin kullanılması için gelir gruplarını temsil eden tüketici mal sepetleri kullanılarak her gelir grubu için farklı TÜFE hesabı yapılmıştır. Çalışma TÜFE ve gelir dağılımı hesabına getirdiği yenilikçi eleştiriler ile literatüre katkı sunmayı amaçlamaktadır. Bu yönüyle çalışma sosyal politikaların belirlenmesi ve uygulanması aşamalarında politika yapıcılara referans olacaktır.
Homines Sacri of Eskibahçe: An Agambenian Reading of Louis de Bernières’ Birds without Wings
(ISTANBUL UNIV, FAC LETTERS, ISTANBUL UNIV EDEBIYAT FAK BATI DILLERI EDEBIYATLARI BOLUMU ORDU CAD NO 6, ISTANBUL 34134, TURKEY, 2022) Özdinç, Tuğçe
This study aims to provide a political criticism of the 2004 novel Birds without Wings by the English author Louis de Bernières, as the political background and overtly political subplot of the novel render it open to one. In order to develop its own argument the study reads Bernières’ novel through the political concepts of the contemporary Italian thinker Giorgio Agamben, focusing mainly on two of them that can be found in Homo Sacer: Sovereign Power and Bare Life of Agamben, and created by the sovereign in relation with the sovereign exception or ban: The first concept is an indistinct concept of life, namely a naked or as Agamben puts it, a bare life. And the second is the homo sacer (sacred man), the one who dwells in this naked life. Living in a small village named Eskibahçe, the characters in Louis de Bernières’ novel are described as birds without wings that “are always confined to earth, no matter how much [they] climb to the high places and flap [their] arms” by the author himself (2005, p.621) and they are turned into homines sacri (sacred men) during a state of political emergency as the footfall of the upcoming change. Therefore, the study aims to examine all the homines sacri in Birds without Wings of Louis de Bernières by an Agambenian reading.
Development of the destination food image scale (DFIS) and examination of measurement invariance by gender
(EMERALD GROUP PUBLISHING LTD, HOWARD HOUSE, WAGON LANE, BINGLEY BD16 1WA, W YORKSHIRE, ENGLAND, 2021) Görür, Hakan; Güzeller, Cem Oktay
Purpose – The main purpose of this study is to create a reliable and valid scale to assess the destination food image perceived by the tourists regarding the food in Turkey within the cognitive and affective image component framework. In line with this purpose, both scale development and scale adaptation studies are conducted, and measurement invariance of the scale for gender is analyzed. Design/methodology/approach – This study uses the survey model among quantitative research methods. Scale development processes are used to assess the cognitive image; the construct validity is analyzed with exploratory factor analysis (n 5 328), confirmatory factor analysis (n 5 425) and convergent and discriminant validity. Scale adaptation processes are followed to assess the affective image, and construct validity is tested with confirmatory factor analysis (n 5 425). The reliability of both scales is investigated with Cronbach’s alpha. Cochran–Mantel–Haenszel (CMH) analysis is conducted for measurement invariance for gender. Findings – Construct validity and reliability provided the desired values in all processes. Measurement invariance results proved that the scale does not change according to genders. Research limitations/implications – The data obtained in this study have geographical limitations, and the data represent tourists visiting Antalya, an important tourism destination in Turkey. Practical implications – The scale will provide concrete information about the destination food image and help practitioners to test the model and develop future strategies for the destination. Originality/value – This study presents an integrated approach to understanding the destination food image and expands theoretical and empirical evidence by creating a scale that measures both cognitive and affective image component. Scale-invariant shows that there is no item bias for analyzed gender and contributes to generalizability.
Structural Identification of Masonry Residential Buildings Considering Wall Openings
(BUDAPEST UNIV TECHNOLOGY ECONOMICS, PERIODICA POLYTECHNICA, BUDAPEST 1521, HUNGARY, 2020) Toydemir, Burak; Koçak, Ali
Although one-story residential masonry structures are thought not to be vulnerable to seismic actions, many heavily damaged and/ or collapsed instances of these types of structures have been observed in the past strong earthquake events. Hence, the evaluation of their safety requires much attention in terms of more precise numerical models. In-situ vibration tests together with laboratory tests on masonry specimens provide valuable information for structural parameter identification that can be used to develop accurate numerical models. These numerical models then can be used for evaluation of the response and seismic safety. While many specific methods and parameters can be adopted in numerical modeling, linear material properties of a structure are expedient in response analysis. Hence, an equation to be used to determine the homogenized linear model parameters for masonry walls with openings is proposed in this study. The equation has been developed based on the percentage of the openings on the wall. The effect of wall openings on the stiffness and the total strength of one-story masonry structures have been evaluated by using the experimental data and the calibrated finite element models. In-situ ambient vibration and material tests have been conducted on three masonry buildings with identical materials and the results from these experiments were used to verify the accuracy of the formulation.
Sophora alopecuroides var. alopecuroides: Phytochemical composition, antioxidant and enzyme inhibitory activity of the methanolic extract of aerial parts, flowers, leaves, roots, and stems
(ELSEVIER, RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS, 2021) Arumugam, Radjassegarin; Sarıkürkcü, Cengiz; Mutlu, Muzaffer; Tepe, Bektaş
Sophora alopecuroides L. are commonly used in traditional Chinese medicine for the treatment of various ailments such as refractory tinea, eczema, dermatitis, colpitis, bacillary dysentery, and other gastrointestinal diseases. The aim of this study was to investigate the chemical composition, antioxidant, and enzyme inhibitory activity of the aerial part, flower, leaf, root, and stems extracts of S. alopecuroides var. alopecuroides. Major compounds of the extracts were found to be ferulic acid, luteolin, hesperidin and pinoresinol. In many of the antioxidant activity assays, the root extract exhibited high activity. In CUPRAC reducing, phosphomolybdenum, ABTS, and DPPH tests, the activity of the root extract was 1.42, 2.45, 1.25, and 8.41 mg/mL, respectively. Root extract also exhibited significant activity in enzyme inhibitory assays. Tyrosinase, a-amylase, a-glucosidase, and acetyl cholinesterase (AChE) inhibitory activities of the extract were determined as 1.22, 2.97, 1.03, and 0.97 mg/mL, respectively. Chromatographic analysis showed that the root extract contained 462.25 mg/g pinoresinol and 256.23 mg/g vanillic acid as the major compounds. Pearson correlation analysis showed that besides flavonoids/phenolics, these phytochemicals also contributed to the activity of root extract. Therefore, it was concluded that these phytochemicals may be responsible for the activity of the root extract. The root extract of S. alopecuroides var. alopecuroides was thought to be an effective antioxidant and enzyme inhibitory agent.
The Effect of Innovation and Participation as Workplace Values on Job Satisfaction and the Mediating Effect of Psychological Ownership
(SAGE PUBLICATIONS INC, 2455 TELLER RD, THOUSAND OAKS, CA 91320, 2021) Aslan, Mustafa; Ateşoğlu, Hülya
Job satisfaction is an important construct in the organizational behavior domain because it affects several organizational variables, such as performance, organizational citizenship behavior, and organizational commitment. This study investigates the effect of innovation and participation as workplace values on job satisfaction and the mediating role of psychological ownership. Participants (N=316) were adults working at different hotels in Antalya, Turkey. The results show innovation and participation as workplace values manifest their effects on job satisfaction through psychological ownership. Moreover, psychological ownership, along with participation, is one of the best estimators of job satisfaction, while participation is the best estimator of psychological ownership among studied variables.
Jean-Luc Nancy’de Sosyo-Ontoloji ve Tekil-Çoğul Varlık Kavramı
(BEYTULHİKME FELSEFE ÇEVRESİ, AŞAĞI ÖVEÇLER MAH, 1307 SOK NO 4-2, ÇANKAYA, ANKARA 06460, TURKEY, 2021) Akalın, Atilla
Jean-Luc Nancy takes the concept of "essence" in order to indicate its drawbacks on the singularity of being. The concept of essence is not a universal and necessary origin, but contingent and historical meanings for Nancy. This historicity in meaning leads Nancy to question the concept of the individual and the rules of the social/public sphere allocated through individuality. Nancy's argument on the ontological environment of finite beings aims to highlight those beings are mixed singular, not belonging to a universal unit. This allows us to discover that being is singular and also singular-plural to the extent that it is with the other. Thus, essential historical concepts invalidate individual or social organizations at this point. Nancy calls this “finitude” which is the only transcendental concept that makes possible the “being-with” (Mitsein). It is possible to think that finitude is the only property to make a community of singularities rather than ready-made concepts of social sciences. I argue that this position is methodological for an alternative socio-ontology.
Selective Separation of Coloring Impurities from Feldspar Ore by Innovative Single-stage Flotation
(TAYLOR & FRANCIS INC, 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106, 2022) Kalyoncu, Enes; Burat, Fırat
The classical use of an anionic collector does not lead to a satisfactory flotation response for feldspars with high content of mica, iron, and titanium oxides. Therefore, amine-type cationic reagents are preferred together with an anionic reagent to remove especially problematic mica minerals. In this study, main colored impurities in the albite ore were efficiently removed by single-stage flotation using newly developed anionic-cationic mixed reagents. 2408 collector alone achieved much greater results at 1000 g/t dosage and a salable feldspar concentrate assaying 0.03% Fe2O3 and 0.07% TiO2 was successfully produced with 93% Na2O recovery at natural pH. The synergistic effects of 2404 and 2408 collectors, which were successful in removing iron and titanium oxides, were investigated and a feldspar concentrate with 0.04% Fe2O3 and 0.03% TiO2 was obtained at a slightly basic pH medium. With this novel and innovative approach, the increased capacity, easier control, less unit cost, and low collector dosage can be easily achieved using a single collector without the need for any frother or pH adjusting agents.
Orange, red and purple barberries: Effect of in-vitro digestion on antioxidants and ACE inhibitors
(ELSEVIER, RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS, 2021) Şensu, Eda; Kasapoğlu, Kadriye Nur; Gültekin Özgüven, Mine; Demircan, Evren; Arslaner, Ayla; Özçelik, Beraat
Bioactive compounds such as phenolics, anthocyanins and carotenoids were investigated in Berberis plant with purple (PB), red (RB) and orange (OB) fruits (barberries). The study was aimed to evaluate the bioaccessibility of the antioxidants and ACE (angiotensin converting enzyme) inhibitory compounds of barberry plants upon their transit through in-vitro digestion. Among barberries, (PB) exhibited the strongest antioxidant activity due to its higher phenolic and flavonoid content. The order of total phenolics and anthocyanins was PB > RB > OB. Chlorogenic acid was the main phenolic compound in all barberries even after in-vitro digestion. All barberries had similar amounts of total carotenoids (4.45 mg?-carotene/100gDW). After in-vitro digestion, decreasing phenolics, anthocyanins and carotenoids led to a reduced antioxidant activity. Anthocyanins were found the most sensitive compounds in-vitro digestion. In terms of ACE inhibition activity, only RB exhibited ACE inhibition before (73.84%) and after (65.51%) in-vitro digestion. No ACE inhibition activity was detected at all in RB and OB samples. Leaves and branches of Berberis had also over 50% ACE inhibitory activity. To our knowledge, this is the first study on the carotenoids of barberry and the effect of in-vitro digestion on its bioactive compounds and ACE inhibitors.
Evaluation of the relationship between environmental accounting and business performance: the case of Istanbul province
(AMER INST MATHEMATICAL SCIENCES-AIMS, PO BOX 2604, SPRINGFIELD, MO 65801-2604, 2021) Şimşek, Hatice; Öztürk, Gökhan
Abstract: Today, as a result of economic growth; The increase in technological developments, industrialization and population ratio brought environmental problems with it. With the increase in environmental problems, environmental awareness and the importance of the environment have improved. With the increase in environmental awareness, important developments have occurred in environmental costs and environmental accounting. At this point, businesses have had to integrate environmental accounting into their accounting systems, either voluntarily or compulsorily. Environmental accounting can be defined as the whole of the activities of determining, collecting, analyzing and reporting environmental cost information to relevant persons. The purpose of this study is to evaluate the impact of environmental accounting approaches of businesses on the overall performance of businesses. In addition, it is intended to determine the activities of the businesses being within the scope of the research on environmental issues. For this purpose, a study was carried out on businesses at Beylikdüzü Organized Industrial Zone. Multiple linear regression analysis was conducted for evaluating the relationship between the environmental accounting approaches of businesses, and the overall performance of businesses. In the analysis, the sub-dimensions of environmental accounting were addressed as independent variables, and business performance was addressed as dependent variable. The data, obtained by random sampling method, was analyzed in the SPSS 20 software package. As the result of the study, it was determined that there is a mutually significant relationship between environmental accounting, and performance. However, the environmental accounting approaches of the companies covered by the study were found to be at low level.
Kripto Paralarda Miktar Teorisi Uygulaması: Bitcoin Örneği ve Covid-19 Salgının Etkisi
(İstanbul Üniversitesi, 2021) Fırat, Seren; Daşdemir, Esat
Bu çalışma kripto paralar için miktar teorisinin geçerliliğini sınamaktadır. Son yıllarda para piyasalarında gündeme gelen kripto paralar, paranın yeni bir türü olarak algılanmaktadır. Paranın tarihsel gelişimi ele alındığında kripto paraların çıkışı, geleneksel paraların kullanılmasına neden olan ihtiyaçlar ile benzerlik göstermektedir. Dolayısıyla literatürdeki para kurallarının geleceğin parası olarak adlandırılan kripto paralar için test edilmemesi büyük bir eksikliktir. Çalışma kapsamında kripto paraların çıkışı ve kullanıma başlaması diğer para türleri ile karşılaştırmalı olarak ele alınmış ve kripto paralar için Fisher’in miktar teorisi modeli test edilmiştir. Temel kripto para birimi olan Bitcoin’in piyasa değeri ve miktarı kullanılarak Ağustos 2010 ve Nisan 2021 dönemini kapsayan aylık frekanslı veriler ile zaman serisi analizi yapılmıştır. Yapılan analiz sonucu Bitcoin miktarı ve değeri arasında doğrusal bir ilişki olduğu anlaşılmıştır. Bu durumun temel nedeni blok zincir yöntemini kullanan kripto paralardaki madencilik faaliyetleri ile açıklanmıştır. Yapılan ekonometrik analiz Covid-19 salgınının Bitcoin miktarı ve piyasa değeri arasındaki doğrusal ilişkiyi güçlendirdiğini göstermiştir. Analiz sonuçlarının anlaşılması ve literatürdeki boşluğu doldurmak amacıyla çalışma kapsamında blok zincir yöntemini kullanan kripto paralar için para arzı, emisyon ve senyoraj geliri gibi konulara değinilmiş ve bu süreçlerin işleyişi açıklanmıştır. Bu çalışma kripto paralarda Fisher Miktar Teorisinin geçerli olmadığını gösteren öncül bir kaynaktır.

Güncel Gönderiler