5173 research outputs found
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SWARA YÖNTEMİ İLE DİJİTAL PAZARLAMA STRATEJİ SEÇİMİ
No full textİşletmeler ya da yeni bir iş girişiminde bulunacak kişiler tarafından yürütülen pazarlama faaliyetleri, teknolojik gelişmelerin ışığında, dijital araçların kullanımıyla yeniden şekillenmiş, bu da dijital pazarlama kavramını ortaya çıkarmıştır. Araştırmanın amacı, işletmelerin ya da yeni bir iş girişiminde bulunacak kişilerin dijital pazarlama yönetiminde yaygın kullanılan etkili stratejilerinin SWARA yöntemi ile önceliklendirilmesidir. Bu amaçtan hareketle, dijital pazarlama stratejileri ve e-ticaret konularında sektörde eğitim veren akademisyenlere, SWARA yönteminin ihtiyacı olan kriter değerlendirme formu hazırlanmış ve bu değerlendirmeler ışığında sonuçlar tartışılmıştır. Araştırma sonucunda, dijital pazarlama strateji seçiminde sırasıyla birinci sırada arama motoru pazarlaması, ikinci sırada sosyal medya pazarlaması, üçüncü sırada içerik pazarlaması ve devamında tıklama başına ödeme, bloglar, viral pazarlama, e-posta pazarlaması, satış ortaklığı, çevrimiçi reklamcılık, text mesajları yer almıştır. Araştırmanın, dijital pazarlama strateji seçiminde yardımcı bir yöntem sunması dolayısıyla hem literatüre hem sektöre katkı sağlayacağı düşünülmektedir. Bunun yanı sıra, SWARA yönteminin diğer çok kriterli karar verme yöntemleriyle birleştirilmesi ilerde yapılacak çalışmalar için fayda sağlayacaktır
Thermomechanical properties of confined magnetic nanoparticles in electrospun polyacrylonitrile nanofiber matrix exposed to a magnetic environment: structure, morphology, and stabilization (cyclization)
No full textElectrospun metal oxide-polymer nanofiber composites hold promise for revolutionizing biomedical applications due to their unique combination of electronic and material properties and tailorable functionalities. An investigation into the incorporation of Fe-based nanofillers for optimizing the polyacrylonitrile matrix was conducted, where the systematic and organized arrangement of inorganic components was achieved through non-covalent bonding. These carefully dispersed nanomaterials exhibit the intrinsic electronic characteristics of the polymers and concurrently respond to external magnetic fields. Electrospinning was utilized to fabricate polyacrylonitrile nanofibers blended with Fe2O3 and MnZn ferrite nanoparticles, which were thermomechanically, morphologically, and spectroscopically characterized in detail. With the application of an external magnetic field in the course of dynamic mechanical measurements under tension, the storage modulus of the glass transition Tg of PAN/Fe2O3 rises at the expense of the loss modulus, and a new peak emerges at similar to 350 K. For the PAN/MnZn ferrite nanofibers a relatively larger shift in Tg (from similar to 367 K to similar to 377 K) is observed, emphasizing that in comparison to Fe2O3, Mn2+ ions in particular enhance the material's magnetic response in MnZn Ferrite. The magnetic oxide particles are homogenously dispersed in polyacrylonitrile, corroborated by high-resolution scanning electron microscopy. Both nanopowder additions lead to a slight shift of the peak towards larger angles, related to the shrinkage of the polymer. Produced nanofibers with high mechanical and heating efficiency can optimize the influence of the intracellular environment, magnetic refrigeration systems and sensors/actuators by their magnetic behavior and heat generation. The incorporation of Fe-based nanofillers for the optimization of the nanofiber of polyacrylonitrile matrix was achieved through non-covalent bonding. Produced nanofibers can optimize the influence of the intracellular environment.Universitt Wien [E-COST-GRANT-CA21101-28134500]; COST Action CONTEXT [CA17107]; COST (European Cooperation in Science and Technology); University of ViennaWe would like to thank for the Short-Term Scientific Mission (STSM) grant (E-COST-GRANT-CA21101-28134500) for ASS between 29/09/2023 -08/10/2023 by the Prof. Dr Wilfried Schranz (Host Institution Faculty of Physics, Physics of Functional Materials, University of Vienna). Empa acknowledges the helpful advice and support of A. Gogos and E. Perret regarding microscopic and spectroscopic investigations. This publication is also based upon work from the COST Action CONTEXT (CA17107), supported by COST (European Cooperation in Science and Technology). Open access funding provided by University of Vienna
Mechanical behavior investigation of fused deposition modeling joints by using different bonding geometry with variable adhesive thickness
No full textPurposeAdhesively bonded joints are used in many fields, especially in the automotive, marine, aviation, defense and outdoor industries. Adhesive bonding offers advantages over traditional mechanical methods, including the ability to join diverse materials, even load distribution and efficient thermal-electrical insulation. This study aims to investigate the mechanical properties of adhesively bonded joints, focusing on adherends produced with auxetic and flat surfaces adhered with varying adhesive thicknesses.Design/methodology/approachThe research uses three-dimensional (3D)-printed materials, polyethylene terephthalate glycol and polylactic acid, and two adhesive types with ductile and brittle properties for single lap joints, analyzing their mechanical performance through tensile testing. The adhesion region of one of these adherends was formed with a flat surface and the other with an auxetic surface. Adhesively bonded joints were produced with 0.2, 0.3 and 0.4 mm bonding thickness.FindingsResults reveal that auxetic adherends exhibit higher strength compared to flat surfaces. Interestingly, the strength of ductile adhesives in auxetic bonded joints increases with adhesive thickness, while brittle adhesive strength decreases with thicker auxetic bonds. Moreover, the auxetic structure displays reduced elongation under comparable force.Originality/valueThe findings emphasize the intricate interplay between adhesive type, bonded surface configuration of adherend and bonding thickness, crucial for understanding the mechanical behavior of adhesively bonded joints in the context of 3D-printed materials.Dogus University Scientific Research Projects Coordination Unit [2021-22-D1-B02]This work was supported by Dogus University Scientific Research Projects Coordination Unit under grant number 2021-22-D1-B02
Experimental investigation on oxygenation efficiency of an effective aeration system for ponds
No full textDissolved oxygen (DO) concentration in water is one of the most important water quality parameters in rivers, lakes, and reservoirs. The most effective way to increase DO concentration in water is aeration. Conduits with high aeration performance are predicted to significantly increase aeration efficiency. Based on this prediction, the physical parameters affecting the aeration efficiency (E 20) of the conduit aeration system were experimentally investigated. The effect of different jet plunge angles, flow rates, hydrostatic levels, Froude numbers, and gate opening rates was investigated to optimize the system for the best ventilation efficiency. As a result, the aeration efficiency (E 20) improves with increasing air intake performance at low gate openings, high Froude numbers, and hydrostatic levels. The increase in jet plunge angles and hydrostatic level directly increases the aeration efficiency. The study showed that conduit systems can be an important alternative for pond aeration due to initial investment and operating costs, low energy cost, and high aeration efficiency.Dogus UniversityNo Statement Availabl
The mediating role of empathy in the relationship between childhood traumas and family functioning
No full textLisansüstü Eğitim Enstitüsü, Psikoloji Ana Bilim DalıÇocukluk çağı travmaları yaşayan bireylerin, yaşamlarının ilerleyen dönemlerinde psikolojik, duygusal ve sosyal işlevselliklerini derinden etkilenmesine neden olmaktadır. Çocukluk çağı travmalarının kalıcı etkileri, bireylerin empati yeteneklerinin ve aile içi ilişkiler üzerinde önemli rol oynadığı görülmektedir. Bu bağlamda, çocukluk döneminde yaşanan travmaların bireylerin empati yetenekleri üzerindeki etkisini anlamak ve bu empatinin aile işlevselliği üzerindeki rolünü incelemek, hem akademik hem de pratik açıdan büyük bir önem taşımaktadır. Araştırmanın örneklemi İzmir'de yaşayan 18-40 yaş arası evli ve en az bir çocuğu olan 399 katılımcıdan oluşmaktadır. Veri toplama araçları olarak, Çocukluk Çağı Travma Ölçeğinin Gözden Geçirilmiş ve Genişletilmiş Türkçe Versiyonu (CTQ- 33), Temel Empati Ölçeği, Aile İşlevsellik Tarzı Ölçeği (FFSS), Sosyodemografik Bilgi Formu kullanılmıştır. Analizler ise aracılık rolüne ilişkin Hayes Process kullanılmıştır. Verilerin analizi SPSS-25 programı ile gerçekleştirildi. Bu araştırmada, çocukluk çağı travmaları ile aile işlevselliği arasındaki ilişkide empatinin kısmi rolü olduğu sonucuna ulaşıldı. Çocukluk çağı ruhsal travmaların artması, temel empati düzeyinin azalmasına neden olurken, azalan empati de aile işlevselliğini olumsuz etkilemektedir.Individuals who experience childhood traumas have a profound impact on their psychological, emotional and social functioning later in life. It is seen that the lasting effects of childhood traumas play an important role on individuals' empathy abilities and family relationships. In this context, understanding the impact of childhood traumas on individuals' empathy abilities and examining the role of this empathy on family functioning is of great importance both academically and practically. The sample of the study consists of 399 participants between the ages of 18-40 who are married and have at least one child living in Izmir. As data collection tools, Revised Shortened Version of Childhood Trauma Questionnaire (CTQ- 33), Basic Empathy Scale, Family Functioning Style Scale (FFSS), Sociodemographic Information Form were used. In the analyses, Hayes Process was used for the mediation role. Data analysis was performed with SPSS-25 program. As a result of the study, childhood traumas have a relationship with family functioning; however, this relationship depends on the presence of empathy. The increase in childhood mental traumas leads to a decrease in the level of basic empathy, and decreased empathy negatively affects family functioning. Therefore, childhood trauma affects empathy and empathy affects family functioning. Basic empathy partially mediates the relationship between family functioning and childhood mental traumas
On the real spectrum of differential operators with PT-symmetric periodic matrix coefficients
No full textWe study the spectrum of the operator T generated by the differential expression of order n > 2 with the m x m Parity-Time (PT)-symmetric periodic matrix coefficients. The case when m and n are the odd numbers was investigated in [18]. In this paper, we consider the all remained cases: (a) n is an odd number and m is an even number, (b) n is an even number and m is an arbitrary positive integer. We find conditions on the coefficients under which in the cases (a) and (b) the spectrum of T contains the sets (-infinity,-H] boolean OR [H,infinity) and [H,infinity) respectively for some H > 0
A comparison of metabolic engineering strategies applied in Yarrowia lipolytica for ?-carotene production
No full textWith a better understanding of the health benefits of beta-carotene, the precursor of vitamin A, as well as its coloring property, the need for this carotenoid has increased in various sectors. In order to meet the increasing demand efficiently, cheaply, and sustainably, interest in heterologous beta-carotene production through metabolic engineering strategies has increased in recent years. In this context, although it is not a native producer of beta-carotene, Yarrowia lipolytica yeast stands out due to its metabolic, physiological, and genomic properties. Successful results have been obtained by using a series of engineering strategies, including biosynthesis pathway engineering, morphological engineering, and fermentation engineering strategies, in the production of heterologous beta-carotene from Y. lipolytica. However, these strategies have various strengths and weaknesses against each other, and there are also some points open to improvement. In this review, the engineering strategies that have been applied and have the potential to be applied for the production of beta-carotene from Y. lipolytica have been examined in depth, including their advantages and disadvantages, and compared with each other. Moreover, a future perspective has been presented to increase the potential of using Y. lipolytica yeast as a cell factory in beta-carotene production
INVESTIGATING OF PERSISTENCE IN CORE, FOOD AND ENERGY INFLATIONS: AN EVIDENCE FROM TIME-VARYING APPROACH
No full textThis study examines how inflation persistence evolves over time in Euro Area, the UK, the US, and OECD countries over the period of 1999:07-2021:09. We consider the persistence of core, energy, and food inflation, as well total inflation. Using an ARMA(1,1) model with time-varying autoregressive parameters based on the Kalman filter (TV-AR), we find that inflation persistence increases significantly during crisis periods and total persistence peaks during the COVID-19 pandemic. However, the persistence of energy inflation decreases due to the economic slowdown during the COVID-19 pandemic. These results highlight how inflation persistence is related to monetary policy objectives and conduct. The findings indicate that the various measures taken by the governments such as containment and closure policies, and travel restrictions to prevent the spread of COVID-19 cause to increase in total and food inflation persistences. Energy inflation persistence declines due to a slowdown in production during COVID-19
The Impact of the COVID-19 Pandemic on Online Grocery Supply Chain Management: A Case Study in Istanbul
No full textThe COVID-19 pandemic has already crippled normal life all over the world. Its negative impact not only changed the human health system tragically but also disrupted the global economic system. One negative result was ended up in the global food supply chain. As the lockdown times have suspended the manufacturing and logistic activities, therefore, the customers have experienced unimaginable chaos in the shopping markets. Moreover, the purchasing habit of the consumers has remarkably changed compared to pre-pandemic. To meet this new demand pattern, many grocery retailers have tried to adapt to the new normal. While before COVID-19 offline grocery purchasing was popular, after the pandemic, online service got tremendous attention in market. In this study, online grocery supply chain management during the COVID-19 in Istanbul is considered. The aim is to find out how online grocery companies will serve more efficiently during the pandemics and which factors have more effect on the customer's satisfaction. To do so, first, three popular grocery retailers in Istanbul were selected. Then, a related survey was designed to understand the consumer experience as doing online grocery shopping in COVID-19. Unsurprisingly, a result shows that 60% of the respondents did online shopping every 3-4 days in one week, and the delivery time is the most important factor for the customers. Then, the SWOT analyses were performed accordingly, and the related strategies were summarized. Finally, several managerial implications were given to may improve the company's online services in COVID-19 and post COVID-19 in Turkey
Single-input multiple-output inverse filters designs with cascade capability
No full textEnhancing a topology of the literature, single-input multiple-output first-order inverse filter topologies are presented in this work. They offer the features of minimized circuit complexity, grounded capacitors requirement and, the most important, the capability of cascade connection with other stages without extra buffers needed. This is achieved thanks to the properties of the Current Feedback Operational Amplifier terminals. The behavior of the structures with regards to the effect of parasitics is evaluated for establishing the suitable frequency range of their operation. The performance of the filters is evaluated using the OrCAD PSpice suite, as well as through experimental results