523 research outputs found
COMMUNICATION SKILL LEVELS IN TURKISH PROSPECTIVE TEACHERS
No full textThe author of this study tested whether Turkish prospective teachers' levels of communication skill differed significantly according to submissive acts, self-images drawn from social comparisons, and several other personal variables. A total of 274 persons participated in this study. The Communication Skills Assessment Scale (Korkut, 1996), The Submissive Acts Scale (Gilbert & Allan, Turkish version Sahin & Sabin, 1992), The Social Comparison Scale (Gilbert & Allan, Turkish version Sahin & Sabin, 1992) and a personal information form developed by the author were used for data collection. Results showed that individuals with a positive self-image, those who perceived themselves as popular and assertive, those coming from a higher income status, and individuals with perceived democratic parental styles reported higher levels of communication skills. No significant differences were found in prospective teacher's communication skills according to submissive acts.https://www.ingentaconnect.com/content/sbp/sbp/2008/00000036/00000009/art00013;jsessionid=1lwuannye493u.x-ic-live-01</p
REFLECTION OF CUSTOMER-BRAND ENGAGEMENT ON PURCHASE INTENTION IN SOCIAL MEDIA
No full textCreating and developing purchase intention in social media is an important strategic goal for businesses. Marketers, in particular, feel the need to invest in consumer-brand engagement (CBE) in social media marketing more than ever before as social media platforms are available for consumers to socialize and interact with each other. However, current research in marketing provides little guidance to marketers how brand pages in Facebook can be leveraged to engage customers and create purchase intention for the brands. Toward filling this gap, the present research examines the customer's brand engagement-purchase intention link with the mediating role of customer's information motivation in social media. Using data from 298 surveys of brand pages are analysed in partial-least squares (PLS) structural equation modelling (SEM). The research fills a gap in the literature through its analysis of the mediating role of information motivation of consumers in the relationship between customer-brand engagement and purchase intention in social media. The specific strategies, and the implications of this research for theory and practise are discussed. (C) 2017 Published by Future Academy www.FutureAcademy.org.U
Synthesis, Cytotoxicity, and Pro-Apoptosis Activity of Etodolac Hydrazide Derivatives as Anticancer Agents
No full textEtodolac hydrazide and a novel series of etodolac hydrazide-hydrazones 315 and etodolac 4-thiazolidinones 1626 were synthesized in this study. The structures of the new compounds were determined by spectral (FT-IR, 1H NMR, 13C NMR, HREI-MS) methods. Some selected compounds were determined at one dose toward the full panel of 60 human cancer cell lines by the National Cancer Institute (NCI, Bethesda, USA). 2-(1,8-Diethyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-yl)acetic acid[(4-chlorophenyl)methylene]hydrazide 9 demonstrated the most marked effect on the prostate cancer cell line PC-3, with 58.24% growth inhibition at 105M (10 mu M). Using the MTT colorimetric method, compound 9 was evaluated in vitro against the prostate cell line PC-3 and the rat fibroblast cell line L-929, for cell viability and growth inhibition at different doses. Compound 9 exhibited anticancer activity with an IC50 value of 54 mu M (22.842 mu g/mL) against the PC-3 cells and did not display any cytotoxicity toward the L-929 rat fibroblasts, compared to etodolac. In addition, this compound was evaluated for caspase-3 and Bcl-2 activation in the apoptosis pathway, which plays a key role in the treatment of cancer
The Impact of Store Deals on Consumer Satisfaction: The Mediating Role of Value Consciousness
No full textThis study aimed to examine the direct impact of store deal proneness on value consciousness and consumer satisfaction, alongside the mediating effect of value consciousness within these dynamics. Data were collected with an online survey from grocery store consumers in Turkey, and the proposed relationships were analyzed via partial least squares structural equation modeling (PLS-SEM) utilizing a sample comprising 500 Turkish consumers who demonstrate deal proneness and a preference for private labels. The findings reveal that store deal proneness positively affects consumers’ value consciousness and satisfaction. Moreover, value consciousness has a positive effect on consumer satisfaction and has a mediating role in the relationship between store deal proneness and satisfaction. The present research provides valuable managerial insights for enhancing consumer satisfaction. The study findings will contribute to retailers developing effective, value-driven strategies by emphasizing store deals that shape consumers’ value consciousness and overall satisfaction. © 2025 Elsevier B.V., All rights reserved
Grayanotoxin-III Detection and Antioxidant Activity of Mad Honey
No full textSahin, Huseyin/0000-0002-6018-1494WOS: 000359160500006Mad honey is a complex mixture of numerous chemicals produced by honeybees from Rhododendron flowers. Consumption of mad honey leads to diarrhea, perspiration, dizziness, changes in consciousness, syncope, diplopia, as well as blurred vision, hypotension, and bradycardia due to the presence of grayanotoxins (GTXs). Therefore, it is important to detect the level grayanotoxins in mad honey. Besides its toxicity, mad honey also has antioxidant activity. This study was designed to determine the level of grayanotoxin-III toxin and antioxidant activity of ten different mad honey samples collected from the Black Sea region of Turkey. Liquid chromatography-tandem mass spectrometry was used for the quantitation of grayanotoxin-III. Antioxidant activity was evaluated using total phenolic contents, total ferric reducing antioxidant power, scavenging of 2,2-diphenyl-1-picrylhydrazyl and 3-(2-pyridyl)-5, 6-diphenyl-1,2,4-triazine-4',4''-disulfonic acid radicals. Quantities of grayanotoxin-III levels ranged from 68.754 to 0.701 mu g grayanotoxin-III/g honey. Mad honey MH7 from Artvin/Hopa had the highest grayanotoxin-III level. Although there were varying levels of grayanotoxin-III, mad honey samples were outstanding in terms of antioxidant activity. MH3 had the highest antioxidant potential. Although toxicity effect comprises, a metered dose of mad honey might also be explored as a potential source in clinical trials due to high bioactivity levels.TAGEMGida Tarim Ve Hayvancilik Bakanligi [AR-GE/15]; Tubitak BidebTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK)The study was supported by TAGEM AR-GE/15, and author Huseyin Sahin was supported by a grant from the research fund of Tubitak Bideb for his Ph.D. research
Study on Use of MSWI Fly Ash with Mainstream Supplementary Cementitious Materials
No full textThe management of municipal solid waste incineration fly ash (MSWI FA) has become a critical issue as its generation increases rapidly along with the global population growth. In this study, MSWI FA was treated via water-washing, and then the untreated and water-treated MSWI FAs (RFA and WFA) were blended with mainstream supplementary cementitious materials (SCMs), including ground granulated blast-furnace slag (GS), silica fume (SF), and limestone powder (LS). The MSWI FASCMblends were used as a cement replacement in a mortar. The content of MSWI FAs was set at 10% (by weight of binder) for all mortar mixtures. The content of GS and LS was also set at 10%, while the SF content was 2.5%. Flowability, setting time, isothermal calorimetry, compressive strength, and free-drying shrinkage tests were performed. The results showed that mortars containing raw (untreated) fly ash (RFA) had reduced strength, whereas mortars containing water-treated fly ash (WFA) displayed comparable or even higher strength than the control mortar (made with 100% cement) after 28 days. While mortars containing RFA showed increased drying shrinkage, mortars containing WFA exhibited diminutive or no increase in drying shrinkage when compared to the control mortar. Based on the test results, the mixture with a cement:WFA:GS ratio of 80:10:10 was the optimal binder for concrete applications.This symposium paper published as Wi, Kwangwoo, Oguzhan Sahin, Kejin Wang, and Yunsu Lee. "Study on Use of MSWI Fly Ash with Mainstream Supplementary Cementitious Materials." Special Publication 362 (2024): 871-886. doi: https://doi.org/10.14359/51742015.The work presented here is part of a project (AWD-024847) sponsored by the City of Ames, Iowa, and the Center for Industrial Research and Service, Iowa State University (ISU), USA. The authors sincerely acknowledge the sponsorship. The second author, Dr. Oguzhan Sahin, would thank the Scientific and Technological Research Council of Turkey (TUBITAK) for the support of his visit at ISU through the "2219-International Postdoctoral Research Fellowship Program for Turkish Citizens"
Effects of different irrigation practices using treated wastewater on tomato yields, quality, water productivity, and soil and fruit mineral contents
No full textWastewater use in agricultural irrigation is becoming a common practice in order to meet the rising water demands in arid and semi-arid regions. The study was conducted to determine the effects of the full (FI), deficit (DI), and partial root-zone drying (PRD) irrigation practices using treated municipal wastewater (TWW) and freshwater (FW) on tomato yield, water use, fruit quality, and soil and fruit heavy metal concentrations. The TWW significantly increased marketable yield compared to the FW, as well as decreased water consumption. Therefore, water use efficiency (WUE) in the TWW was significantly higher than in the FW. Although the DI and the PRD practices caused less yields, these practices significantly increased WUE values due to less irrigation water applied. The water-yield linear relationships were statistically significant. TWW significantly increased titratable acidity and vitamin C contents. Reduced irrigation provided significantly lower titratable acidity, vitamin C, and lycopene contents. TWW increased the surface soil and fruit mineral contents in response to FW. Greater increases were observed under FI, and mineral contents declined with reduction in irrigation water. Heavy metal accumulation in soils was within safe limits. However, Cd and Pb contents in fruits exceeded standard limits given by FAO/WHO. Higher metal pollution index values determined for fruits also indicated that TWW application, especially under FI, might cause health risks in long term
The Effects of Brand Experiences, Trust and Satisfaction on Building Brand Loyalty; An Empirical Research On Global Brands
No full textAbstractMarketing academics and practitioners have acknowledged that consumers look for brands that provide them with unique and memorable experiences. As a result, the concept of brand experience has become of great interest to marketers. The present field study, conducted with actual consumers, addresses the question whether different consumers prefer different experiential appeals and whether experiential types create the relationships between brand experiences, satisfaction, trust and loyalty. Brand experience is conceptualized as sensations, feelings, cognitions, and behavioral responses evoked by brand-related stimuli that are part of a brand's design and identity, packaging, communications, and environments. Brand experience affects satisfaction, trust and loyalty. From the customer viewpoint, brands are relationship builders. In this present research, we propose the effects of brand experiences to build long-lasting brand and customer relationship with brand trust, satisfaction, and loyalty. The study was conducted on 258 respondents. As a result of this study, brand experiences, satisfaction, trust have positively effects brand loyalty
Limiting factors of the tensile strength of aramid fibers
No full textThe correlation between the evolution of crystallite orientation in aramid fibers during loading and their mechanical and failure behavior were investigated. Three types of as-spun aramid fibers and a heat-treated type were employed with initial distributions of crystallite orientations between 16.7º and 9.7º with respect to the fiber axis. These directly correlated with the initial moduli that were between 66 GPa and 119 GPa, with no correlation between the initial crystallite orientation distribution and the tensile strength values that ranged between 3.5 and 4.0 GPa. Cyclic loading of individual, 10 mm long, as-spun filaments increased their initial moduli, all converging to 100 GPa for all fiber types when cycled to 90% of their respective tensile strength values. This modulus value (100 GPa) corresponds to a stable crystallite orientation distribution of 11.6º. On the other hand, the initial unloading modulus of all fiber types when loaded to 90% of their tensile strength converged to ~165 GPa which approaches the theoretical modulus of 220 GPa for monopolymer aramids. This limit value of the unloading modulus also signifies the tightest crystalline domain orientation distribution of 6.6º with respect to the fiber axis. However, this orientation distribution is not retained upon unloading. On the other hand, as-fabricated, post-spun heat-treated fibers had a much higher initial modulus of 120 GPa, and an initial unloading modulus of 170 GPa after mechanical cycling to 90% of their tensile strength value, corresponding to 5.8º domain orientation distribution. In all aramid types, mechanical cycling increased the initial modulus by as much as 54% while leaving the tensile strength of each fiber type unaffected in the narrow range of the aforementioned initial values. Thus, the limiting orientation distribution of ~6º emerges as the controlling factor in tensile failure of this class of fibers. Tension tests conducted at different strain rates showed that the permanent orientation of crystalline domains at high strains/stresses scales inversely with the applied strain rate. Notably, at strain rates of 0.2-0.3 s -1 both as-spun and heat-treated fibers were linearly elastic until failure.
A hypothesis that the fiber tensile strength is controlled by preexisting defects was tested by examining the scaling of the tensile strength with the fiber gauge length for fibers with lengths in the range of 200 µm to 10 mm. Prior works that were limited to fiber gauge lengths longer than 2 mm, have been inconclusive due to large data scatter for short fibers. Controlled tests conducted in this dissertation research with dedicated test apparatuses for small scale experimentation, demonstrated a constant tensile strength for gauge lengths as short as 200 µm, thus, implying that failure does not obey weakest link statistics that are descriptive of critical flaw-induced failure initiation. Notably, in short gauge length fibers (200 µm) of all aramid types failure initiation occurred near the skincore interface, followed by extrusion of the fiber core from the skin. Thus, the microstructural differentiation between the fiber core and the skin presents a likely limiting factor in tensile strength of aramid fibers.
Finally, the shear strength of the fiber core was measured for the first time with novel experiments that were designed and implemented with the aid of surface micromachined Microelectromechanical Systems (MEMS) devices. Edge notches were milled out in individual fibers using a focused ion beam to generate a zone of uniform shear stress along the fiber, when the latter was subjected to uniaxial tension. The optimum specimen design and specimen geometry were guided by a finite element analysis to shape the notch tip such that the stress singularity is eliminated and a uniform shear dominant plane is achieved. These unique but also challenging experiments were carried out on aramid fibers with the lowest orientation of 16.7º resulting in average shear strength of 85±7.6 MPa.
In conclusion, this dissertation research established new experimental tools and methods to investigate the origin of failure initiation in aramid fibers manufactured under different conditions. A limiting orientation distribution angle was established for all aramid grades, including those that were subjected to heat treatment, while the skin-core interface was identified as the weak interface where failure may take place.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2019-12-01The student, Korhan Sahin, accepted the attached license on 2017-12-08 at 09:08.The student, Korhan Sahin, submitted this Dissertation for approval on 2017-12-08 at 09:38.This Dissertation was approved for publication on 2017-12-08 at 14:28.DSpace SAF Submission Ingestion Package generated from Vireo submission #11914 on 2018-03-13 at 10:37:53Made available in DSpace on 2018-03-13T17:35:51Z (GMT). No. of bitstreams: 11
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Flow details of a circular cylinder mounted on a flat plate
No full textThe main purpose of this study is to investigate the flow structure up- and downstream of a circular cylinder mounted on a flat surface in the boundary layer region using a Particle Image Velocimetry (PIV) technique for Reynolds numbers ranging from 750 to 9600. The interaction between the primary, incoming, and counter-clock-wise rotating vortices and the trail of the horseshoe vortices formed at the upstream base of the cylinder are quantitatively identified in terms of the instantaneous and time-averaged flow data. The entrainment is shown to be activated between the main and separated flow regions across the shear layer by interactions of opposite signed rotating vortices which are responsible for scour in the upstream region of the cylinder. The surface fluid bursts to create counter-clock-wise rotating vortices upstream of the cylinder to split the incoming clock-wise rotating vortex into an independent vortex. Since the counter-clock-wise rotating vortices are not fed continuously by the surface fluid, they gradually expand in size but lose the strength and later are swept away by the developing vortices. © 2008 International Association of Hydraulic Engineering and Research
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