40 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
Sclerostin and osteoprotegerin: new markers of chronic kidney disease mediated mineral and bone disease in children
No full textBackground: Sclerostin and osteoprotegerin (OPG) are new markers of chronic kidney disease (CKD) mediated mineral bone disease (CKD-MBD) which were extensively evaluated in adult population. We aimed to evaluate the associations between serum levels of sclerostin/OPG and parameters of bone turnover and compare the serum levels of sclerostin/OPG in different stages of CKD in children. Methods: 70 children with CKD stage 1-5, aged 2-21 years were examined. Serum levels of alkaline phosphatase (ALP), creatinine, total calcium, phosphorus , intact parathyroid hormone (iPTH) and vitamin D were measured. Serum sclerostin and OPG levels were measured in children with different levels of CKD stage and their association with bone turnover parameters were noted. Results: We did not observe any significant correlation between serum levels of sclerostin and OPG and stages of CKD. A negative relationship was present between serum sclerostin and 25-OH vitamin D levels. Osteoprotegerin was positively and significantly correlated with ALP but serum sclerostin was negatively correlated with ALP. Conclusion: Our study, which includes only children and adolescents with a growing skeleton under uremic conditions and excluding diabetes and atherosclerosis interference, is very valuable. We couldn't find any significant relationship between either sclerostin or OPG levels among different stages of CKD. Also our study demonstared a strong negative relationship between ALP and sclerostin levels and a strong positive relationship between ALP and OPG levels, reminding the importance of ALP levels to predict the bone-mineral status of the children with CKD
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
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
