35 research outputs found
Metallurgical Assessment of Novel Mg-Sn-La Alloys Produced by High-Pressure Die Casting
No full textSakarya University Scientific Research Project Council [2017-0908-014]; Turkish National Scientific Council (Tubitak) via 2219 - International Postdoctoral Research Fellowship ProgramTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [1059B191800747]This work was supported by the Sakarya University Scientific Research Project Council under Grant [number 2017-0908-014]. The author also would like to acknowledge funding assistance provided by the Turkish National Scientific Council (Tubitak) via 2219 - International Postdoctoral Research Fellowship Program Grant no 1059B191800747. The help of Ipek GOKCE, Murat GOKCE, Paramjot SINGH and Arulselvan ARUMUGHAM AKILAN in the experimental work are gratefully acknowledged.Mg alloys containing Al are widely used for industrial applications, but the use of these alloys as an automotive part is limited due to the low melting temperature of the Mg17Al12 intermetallic phase. Therefore, magnesium alloys without aluminum that can withstand higher operating temperatures are of interest to the automotive industry. The objective of this work is to develop Al-free Mg alloys for industrial applications. In the current work, four types of alloys were produced with varying La contents. The high-pressure die casting method was selected to overcome the problems inherent in the gravity casting method with respect to the production of parts with complex shapes and thin walls. X-ray diffraction analysis revealed that the base alloy (Mg-5Sn wt%) comprises of alpha-Mg and Mg2Sn phases whereas La containing alloys included intermetallic phases such as LaMg3, Mg17La2, and La5Sn3. Corresponding grain sizes of the alloys with La are lower than those of the Mg5Sn alloy. Due to this lower grain size and emerging dispersoids, the tensile strength of the Mg5Sn4La alloy (205 MPa) is roughly double that of Mg5Sn. Moreover, the addition of the 4% wt. La to the Mg5Sn alloys led to an increase in yield strength and ductility by 25% and 50%, respectively
Spectroscopic (FT-IR, Raman, NMR and UV-vis.) and quantum chemical investigations of (E)-3-[4-(pentyloxy)phenyl]-1-phenylprop-2-en-1-one
No full textGokce, Halil/0000-0003-2258-859X; Naseer, Muhammad Moazzam/0000-0003-2788-2958WOS: 000342254500042In this study, the molecular structure and vibrational and electronic transition spectra and H-1 and C-13 NMR chemical shift values (gas phase and in chloroform solvent), HOMO-LUMO analysis, molecular electrostatic potential (MEP), thermodynamic properties and Mulliken atomic charges of (E)-344-(pentyloxy)phenyl]-1-phenylprop-2-en-1-one molecule, C20H22O2, which has many biological activities have been calculated using the DFT/B3LYP method with 6-311++G(d,p) basis set in the ground state. The obtained results indicate a good harmony among the calculated and the experimental FT-IR, Raman, UV vis. (in methanol solvent) and H-1 and C-13 NMR (in chloroform-d solvent) spectra of the mentioned compound. (C) 2014 Elsevier B.V. All rights reserved.Higher Education Commission of PakistanHigher Education Commission of PakistanThe author AA is grateful to Higher Education Commission of Pakistan for financial support
Giving money to the poor: the political payoffs of allocating conditional cash transfers in Turkey
No full textThis dissertation analyzes the political consequences of the Conditional Cash Transfer program (CCT) in Turkey, The purpose is three-fold: first, to investigate the political incentives and payoffs that motivate policymakers to adopt CCTs; second, to test whether political or technocratic criteria explain the allocation of CCTs in Turkey, and third, to examine whether conditionally transferring cash to the poor empowers poor citizens, or produces/reproduces pressure on the poor to reciprocate by supporting the political party that made the cash transfer. My research draws on six months of fieldwork conducted in Malkara, Tekirdağ (with Roma beneficiaries) and Diyarbakır (with Kurdish beneficiaries), and on regression analysis of original district level data on the allocation of CCTs. I reach three primary conclusions. First, the adoption of CCTs under the coalition government, influenced and pushed by the World Bank, led to a relatively strict formulation of the social assistance scheme in Turkey, which provides a promising attempt to make a transition to programmatic social policy. Second, although on balance, social and economic indicators guide the distribution of funds, Kurdish districts appear to receive favorable treatment. Third, due to the lack of CCTs requirements for increased social participation and active social engagement on the part of beneficiaries, the CCT program does not have a transformative impact on the enhancement of citizenship and the empowerment of women for both the Kurdish and Roma communities. Rather, more politicized groups, such as the Kurdish people, view the benefit as their social right due to state’s inefficiency in creating jobs in the eastern part of Turkey and their uneasy relations with the state. Among less politicized groups, such as the Roma people, the program triggers feelings of gratitude and appreciation to the politicians providing this program, especially Prime Minister Erdoğan.Ph. D.Includes bibliographical referencesby Ozgen Gokce Bayka
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Infrastructures of Entrepreneurship: State Reform and Development in Oman
No full textTitled “Infrastructures of Entrepreneurship: State Reform and Development in Oman,” this dissertation explores how under pressure from low oil prices, enormous budget deficits, and a faltering economic model the Omani state has been renegotiating its relationship with global capitalism in a dawning post-oil era. To apprehend this development, I ethnographically explore how the Omani government has embarked on a multi-sited program of economic reform, in which the promotion of entrepreneurship plays an important role. Based on 12 months of archival and field research in London and Muscat, I demonstrate how the state reform project, meant to revitalize the engines of capital accumulation in one country, transcends the “economic.” It explores how emotions, bureaucratic complaints, new ideas about productivity and creativity, foreign experts, and local entrepreneurs are reworking the contours of capitalism in Oman, while seeking to transform the state, society, and the individual. This dissertation provides a glimpse into this complex and contradictory reform process and the exigencies of post-oil development under late capitalism.Originally embargoed upon deposit through 05/19/2028; contacted by Graduate College to apply permanent restriction per author request, 06-July-2021, Kimberly; contacted by author to release dissertation 31-Oct-2023, Kimberly
Computational Abstraction of Films for Quantitave Analysis of Cinematography
No full textCurrently, film viewers’ options for getting objective information about films before watching them, are limited. Comparisons are even harder to find and often require extensive film knowledge both by the author and the reader. Such comparisons are inherently subjective, therefore they limit the possibilities for scalable and effective statistical analyses. Apart from trailers, information about films cannot reach viewers audibly or visibly, which seems absurd considering the very nature of film.
The thesis examines repeatable quantification methods for computationally abstracting films in order to extract informative data for visualizations and further statistical analy- ses. Theoretical background empowered by multidisciplinary approach and design processes are described. Visualizations of analyses are provided and evaluated for their accuracy and efficiency.
Throughout the thesis foundations for the future automated quantification player/plugin, are described aiming to facilitate further developments. Theoretical structures of the website which may act as a gateway that collects and provides data for statistical cinematic research are also discussed
Comparative investigation of iron oxide nanoparticles and microparticles using the in vitro bacterial reverse mutation and in vivo Allium chromosome aberration and comet assays
No full textIron oxide-Fe2O3 nanoparticles-NPs and microparticles-MPs widely used in medical applications were comparatively investigated for in vitro mutagenicity and in vivo cytotoxicity/genotoxicity using the Ames test in Salmonella typhimurium strains (125, 250, 500, 750, 1,000 µg/mL) and chromosome aberration/comet assays in Allium cepa (all concentrations but 1,000 µg/mL), for the first time. Neither of the particles was mutagenic in all the bacterial strains in the media without (-S9) mix. However, with the S9 mix, a significant increase was determined in the reverting colonies in some concentrations in TA 97a. In TA 102, all the concentrations but 125 µg/mL also revealed a significant increase. These effects were regarded as weak mutagens since they were < twofold of the negative value. In the Allium test, almost all concentrations of NPs and MPs significantly decreased mitotic index (MI) compared to the negative control at all treatment times (down to 6.06% at 250 µg/mL and 6.40% at 750 µg/mL at 48 h, respectively). The frequency of aberrations significantly increased following all concentrations of NPs in all treatment periods (the highest was 62.03%). However, only a few concentrations of MPs induced significant aberrations (the highest was 32.18%). In the comet assay, while the two lowest concentrations of NPs were more effective in DNA damage, Fe2O3 MPs significantly increased DNA damage at more treatment points at both treatment periods. Both particles were also characterized morphologically and physicochemically. The results revealed that further investigations using different organisms and test systems are necessary for the safer usage of these particles. Graphical abstract: [Figure not available: see fulltext.]
Spectrophotometric pKa Values of 3-(m-Nitrophenyl)-1,5-Diphenyl Formazan (MNF) and 3-(p-Nitrophenyl)-1,5-Diphenyl Formazan (PNF) in Different MeCN-Water Binary Mixtures
No full textThe acid dissociation constants of 3-(m-nitrophenyl)-1,5-diphenyl formazan (MNF) and 3-(p-nitrophenyl)-1,5-diphenyl formazan (PNF) have been determined in acetonitrile-water binary mixtures [50%, 60% and 70% (v/v)] by spectrophotometric method at 25 degrees C and an ionic strength of 0.1 mol .L-1 KCl. The absorption spectra were recorded in solutions of varying pH-values. Data evaluation was performed using the STAR software program which calculates stability constants and molar absorbances of the pure species by multilinear regression. A linear relationship between acidity constants and the mole fraction of acetonitrile in the solvent mixture was observed. The effect of solvent properties on acid-base behavior was discussed. The effect of nitro groups attached to para and meta positions on the ionization constant were investigated and the results were recorded.Kafkas University [2008-FEF-18]The author greatly acknowledges the financial support from Kafkas University (project no: 2008-FEF-18) and Jose L. Beltran from Universitat de Barcelona for kindly providing the spectral data processing software, STAR
Developing three-dimensional spatial embodiment in architectural design education: underwater experiences
No full textThree-dimensional thinking, observation, and practice have long been an important part of architectural education. Reduced awareness of corporeality and the senses can impair a student's capacity to create and develop an architectural environment holistically. Simulation programmes are an important tool to fill this gap, as they can broaden a student's perceptual framework. This article aims to understand the potential of underwater contact experiences to serve this purpose, especially underwater (UW) rugby which is one of the few sports that is three-dimensional. The article also aims to understand how simulation programmes, virtual reality, or augmented environments of UW rugby can contribute to design and architecture education by increasing student awareness. The article is grounded in the impact of this sport on the author and the author's perceptions based on personal experience as a former UW rugby player. It is argued that the simulation of UW rugby can contribute to design-related topics such as free form-finding, role-sharing and group collaboration, the development of awareness to sensorial design processes, risk- taking and action-oriented processes, designing with environmental uncertainty, and even design management, as these immersive environments provide a new agenda for future designers. Due to practical limitations, the article presents a theoretical argument as a first step toward developing a theoretical framework. Future studies with cognitive research methods and quantitative approaches in sports simulation design research will address these constraints
Updated approach for the management of osteoporosis in Turkey: a consensus report
No full textAs a result of the current demographics, increased projections of osteoporosis (OP) and prevalence of the disease in Turkey, a panel of multidisciplinary experts developed a thorough review to assist clinicians in identifying OP and associated fracture risk patients, diagnosing the disease with the appropriate available diagnostic methods, classifying the disease, and initiating appropriate treatment. The panel expects to increase the awareness of this prevalent disease, decrease consequences of OP with corresponding cost savings and, ultimately, decrease the overall burden of OP and related fractures in Turkey. Background OP is not officially accepted as a chronic disease in Turkey despite the high prevalence and predicted increase in the following years. However, there are areas where the country is performing well, such as having a country-specific fracture risk assessment model, DXA access, and the uptake of FRAX. Additional efforts are required to decrease the existing treatment gap estimating 75-90% of patients do not receive pharmacological intervention for secondary prevention, and the diagnosis rate is around 25%. Methods A selected panel of Turkish experts in fields related to osteoporosis was provided with a series of relevant questions to address prior to the multi-day conference. Within this conference, each narrative was discussed and edited by the entire group, through numerous drafts and rounds of discussion until a consensus was achieved. Represented in the panel were a number of societies including The Turkish Osteoporosis Society, The Society of Endocrinology and Metabolism of Turkey (SEMT), and The Turkish Society of Physical Medicine and Rehabilitation. Results Standardized general guidelines to identify OP and related fractures and at-risk population in Turkey, which will enable clinicians to accurately and effectively diagnose the disease, treat the appropriate patients with available pharmacological and non-pharmacological treatments and decrease the burden of the disease. Conclusions This manuscript provides a review of the current state of OP and related fractures in Turkey. Moreover, this manuscript reviews current international guidelines and national studies and proposes a number of helpful country-specific classifications that can be used by healthcare providers caring for the at-risk population. Additionally, the panel proposes practical recommendations that should be implemented nationally in order to decrease the burden of OP and related fractures and effectively preventing the burden in future generations
Co-rhythm: Analyzing children's performative gesture-based interactions in a music composition tool
No full textIn this paper, we present preliminary insights about the classification of children's gestural input elicited from a hand movement tracking prototype for musicmaking, namely Co-Rhythm. The analysis builds on the existing gesture taxonomy in human-computer interaction, and provide insights into children's performative gestures when controlling a musical instrument sound for analysing gestural input. Based on our study with four children (aged between 8-11) and four young adults, we report the qualitative results for describing the gestural categories for analysis and informal observational notes on how children's gestural interaction with the prototype differed from young adults. This study is an initial step towards capturing the complexity of performative gestures in relation to guided vs. free version of visual cues. This study shed a light on children's gestures as an input for embodied interaction in performative tasks (e.g., music composition) as well as providing some design recommendations derived from experts from a design workshop on how to further develop cues for guiding children's performative gestures in music making
