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The determinants of green purchasing in the hospitality sector: a study on the mediation effect of LOHAS orientation
No full textThe objective of this study was to identify the determinants of personal norm and to measure the effect of personal norm on green purchasing behavior as well as a possible mediating role of consumer LOHAS orientation in the effect of personal norm on green purchasing behavior in the hospitality context. A field study was designed to measure the hypothesized effects, and 418 consumers who regularly purchase summer holidays in hotels were included in the survey. Structural Equation Modeling (SEM) was employed in order to test the proposed hypotheses. The results confirm that social norm, the ascription of responsibility, and the attitude towards green purchasing behavior are the determinants of personal norm. Personal norm is found to affect both the green purchasing behavior and the LOHAS orientation of consumers. The results of the study also confirmed that LOHAS orientation does not mediate the effect of personal norm on green purchasing behavior due to the dominance of personal norm’s effect on LOHAS orientation. Academic as well as managerial implications are provided in the Discussion. The Conclusion provides the most important academic and practical contributions of the study, limitations related to the generalizability of the findings, and recommendations for future studies.No sponso
Near-infrared inducible supports in bio-catalysts design: A useful and versatile tool in enhancement of enzyme activity
No full textImmobilized enzymes have encountered two main challenges: Reduced enzyme activity compared to free enzymes and exhausted immobilized enzymes due to reusability. Herein, we suggested a promising activity enhancement strategy to overcome these challenges. The emission from upconversion nanoparticles (UCNPs) under near-infrared (NIR) excitation can increase the activity of PEG-l-ASNase due to Förster Resonance Energy Transfer. For this purpose, UCNPs were initially synthesized using the hydrothermal method. Subsequently, these UCNPs were functionalized with a polycationic polymer, branched polyethyleneimine (PEI), and the immobilization of PEG-l-ASNase was achieved through adsorption. We preliminarily explored the parameters such as enzyme concentration, incubation time, pH, temperature, reusability, storage stability, and kinetic study, etc. Further, the in vitro biocompatibility, hemolytic behavior, and anticancer activity of the produced UCNPs were also analyzed as crucial parameters. The results showed the pH durance, thermal and storage stability of the immobilized PEG-l-ASNases were enhanced. The immobilized PEG-l-ASNases maintained their activity to ≥55 % after 20 cycles. Enzyme immobilization led to a decrease in Km and Vmax compared to PEG-l-ASNase. In vitro assays revealed that immobilized enzyme further reduced the proliferation of human leukemia cell line (HL-60) upon NIR irradiation exposure but did not cause toxicity. This research may provide a new strategy to promote the catalytic activity of l-ASNase and demonstrates its potential application on human leukemia cells. Finally, these outcomes are valuable for the use of NIR induction in enzymatic reactions.No sponso
Neurocognitive responses to spatial design behaviors and tools among interior architecture students: a pilot study
No full textThe impact of emotions on human behavior is substantial, and the ability to recognize people’s feelings has a wide range of practical applications including education. Here, the methods and tools of education are being calibrated according to the data gained over electroencephalogram (EEG) signals. The issue of which design tools would be ideal in the future of interior architecture education, is an uncertain field. It is important to measure the students’ emotional states while using manual and digital design tools to determine the different impacts. Brain-computer interfaces have made it possible to monitor emotional states in a way that is both convenient and economical. In the research of emotion recognition, EEG signals have been employed, and the resulting literature explains basic emotions as well as complicated scenarios that are created from the combination of numerous basic emotions. The objective of this study is to investigate the emotional states and degrees of attachment experienced by interior architecture students while engaging in their design processes. This includes examining the use of 2D or 3D tools, whether manual or digital, and identifying any changes in design tool usage and behaviors that may be influenced by different teaching techniques. Accordingly, the hierarchical clustering which is a technique used in data analysis to group objects into a hierarchical structure of clusters based on their similarities has been conducted.No sponso
18-25 yaş arası akıllı telefon bağımlısı gençlerde karpometakarpal eklem pozisyon hissi, lateral kavrama ve hafif dokunma duyusunun incelenmesi
No full textAmaç: Bu çalışma, 18-25 yaş arası akıllı telefon bağımlısı olan ve olmayan gençlerde karpometakarpal eklem pozisyon hissi, lateral kavrama kuvveti ve hafif dokunma duyusunun karşılaştırılması amacıyla yapıldı.
Yöntem: Çalışmaya 18-25 yaş arası 38 (kadın=29, erkek=9) birey dahil edildi. Katılımcıların sosyo-demografik bilgileri alındıktan sonra, başparmak ağrıları Numerik Ağrı Ölçeği ile, akıllı telefon bağımlılıkları Akıllı Telefon Bağımlılık Ölçeği-Kısa Form ile, lateral kavrama kuvvetleri pinçmetre ile, karpometakarpal eklem pozisyon hisleri 20˚, 30˚ ve 40˚ başparmak
abdüksiyonunda Eklem Pozisyon Hissi Testi ile, hafif dokuma duyuları başparmak ucu, proksimal falanks ve tenar bölgelerinden Semmes-Weinstein Monofilament Testi ile değerlendirildi.
Bulgular: Çalışmaya katılanların %52,6’sı kendini akıllı telefon kullanım bağımlısı olarak tanımladı. Kadınlarla erkekler arasında akıllı telefon bağımlılık düzeyleri arasında fark bulundu (p<0,05). Eklem pozisyon hissi testinde yeniden konumlandırmada oluşan eklem pozisyon hatasıyla gruplar arası karşılaştırıldı. Akıllı telefon bağımlısı olan ve olmayan
gençler arasında 20˚, 30˚ ve 40˚ başparmak abdüksiyonundaki karpometakarpal eklem pozisyon hatasında ve hafif dokunma duyusunda fark bulunmadı (p>0,05); fakat lateral kavrama kuvveti ve baş parmak ağrısı anlamlı bulundu (p<0,05).
Sonuç: Çalışma sonucunda gençlerde akıllı telefon bağımlılığının lateral kavrama kuvvetini azalttığı fakat karpometakarpal eklem pozisyon hissi ve hafif dokunma duyusuna herhangi bir etkisinin olmadığı sonucuna varıldı.No sponso
Portakal citrus sinensis meyve özleri kullanılarak biyosentezlenen bakır nanopartiküllerin karakterizasyonu ve antibiyotiklerle sinerjistik aktiviteleri
No full textGreen chemistry, which offers environmentally friendly and low-cost production with the rich phytochemical properties of plants, has an important place in nanoparticle synthesis. In this study, orange (Citrus sinensis) fruit extracts were preferred for the synthesis of copper nanoparticles (CuNP) due to the effect of ascorbic acid contained in it. The biosynthesis of CuNPs was observed by UV-Vis spectrophotometry and their morphology by transmission electron microscopy (TEM). The formation of CuNPs was confirmed by XRD. The UV-Vis absorbance spectrum of CuNPs gives a single peak at 635 nm. The average size of CuNPs, which were understood to have a spherical shape according to TEM images, was measured as 21.50 ± 8.70 nm. According to XRD results, CuNPs; corresponding to (111), (200) and (220) surfaces; have face-centered cubic structure (FCC) at 44.3150, 51.2150 and 74.7850. The antibacterial activity of CuNPs was determined by the disc diffusion method, and synergistic effects comparable to antibiotics were observed on the gram (+) bacteria Staphylococcus aureus ATCC 29213 and gram (-) bacteria Escherichia coli ATCC 25922.No sponso
Nonlocal abstract ginzburg-landau type equations and application
No full textWe study a nonlocal abstract Ginzburg–Landau type equation. The equation includes variable coefficients with convolution terms and an abstract linear operator function A in a Fourier-type Banach space E. For sufficiently smooth initial data, assuming growth conditions for the operator A and the coefficient a, the existence and uniqueness of the solution and the Lp -regularity properties are established. We obtain the existence and uniqueness of the solution, and the regularity of different classes of nonlocal Ginzburg–Landau-type equations by choosing the space E and operator A that occur in a wide variety of physical systems.No sponso
Investigation of gamma ray shielding characteristics of binary composites containing polyester resin and lead oxide
No full textIonizing radiation plays an essential role across various fields but also poses significant health risks, requiring effective shielding solutions. This study focuses on the photon shielding properties of PbO-reinforced composites, specifically PbO-0, PbO-2, PbO-4, PbO-6, PbO-8, and PbO- 10, through experimental measurements of photon energies ranging from 59.5 keV to 1408.0 keV. The measurements were taken using an HPGe detector. Experimental results were compared to theoretical calculations. Among the tested composites, PbO-10, which contains the highest concentration of lead oxide (PbO), provided the most effective radiation shielding. This sample demonstrated superior mass and linear attenuation coefficients, offering excellent protection at low photon energies. Furthermore, PbO-10 exhibited the lowest half-value layer (HVL) and tenth-value layer (TVL) values, indicating its efficiency in reducing radiation intensity with thinner material layers. It was determined that the experimental TVL results for PbO-O, PbO-2, PbO-4, PbO-6, PbO-8, and PbO-10 at 59.5 keV photon energy were 9.95, 5.98, 4.77, 3.67, 3.22, and 2.71 cm, respectively. With these outstanding attenuation capabilities, PbO-10 is deemed highly suitable for use in medical, industrial, and radiation-heavy environments. In summary, this research emphasizes the effectiveness of PbO-reinforced composites in gamma-ray shielding, with PbO-10 emerging as the top performer, demonstrating great potential for applications that require durable and efficient radiation protection.No sponsorNo sponso
Carbon footprints and income inequality: a panel data analysis of the 66 largest carbon emitting nations
No full textIn this study, we delved into the complex interaction between carbon emissions and critical economic and environmental factors using Two-step Sys-GMM Dynamic Panel Data Estimation. Our comprehensive dataset encompassed 66 major carbon-emitting nations spanning 1990-2020, providing a robust analytical foundation. Our key findings revealed a noteworthy positive relationship between income inequality, as measured by the Gini index, and carbon emissions across all models. This implies that higher income inequality is linked to increased carbon emissions, possibly due to consumption disparities and resource utilization. Furthermore, the relationship between income and emissions displayed intriguing dynamics. While income per capita exhibited a positive association with emissions, suggesting that growing economies tend to emit more, the squared income per capita variable showcased an inverted U-shaped pattern. This suggests that emissions increase at a diminishing rate as income levels reach a certain threshold, aligning with the Environmental Kuznets Curve hypothesis. Surprisingly, we observed that rising income inequality contributed to long-term carbon reduction, hinting at potential shifts in consumption behavior driven by environmental policies as nations develop. Our analysis also highlighted the roles of energy consumption and urbanization in elevating emissions, emphasizing the need for energy efficiency and sustainable urban planning. Conversely, a higher share of renewable energy was linked to reduced emissions, underscoring the urgency of transitioning to cleaner energy sources. Furthermore, net foreign direct investment and international trade exhibited positive associations with carbon emissions, emphasizing the environmental consequences of globalization. Our research underscores the potential of targeted policies addressing income inequality to promote social equity while reducing emissions. Striking a balance between economic growth and environmental sustainability remains crucial, given the intricate dynamics between income and emissions.No sponso