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Search Results: 1 - 10 of 11 matches for " Bugrahan YALVAC "
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A Sociological Standpoint to Authentic Scientific Practices and its Role in School Science Teaching
Mehmet C. AYAR,Bugrahan YALVAC
Journal of Kirsehir Education Faculty , 2010,
Abstract: In this paper we place an emphasis on authentic science practices grounded by anthropological and sociological lenses of science and discuss their implications for science teaching. We highlight the problem of typical science teaching as teaching merely about the “normal science” and ignoring the sociological characteristics of scientific practice. After briefly reviewing the sociological and anthropological perspectives of science, we propose including the social characteristics of science and the notion of communities of practice in designing science learning environments and considering them as essential components of the nature of science teaching practices. Next, we discuss the characteristics of authentic scientific practices as reported in recent studies and examine how researchers operationalized authentic science practices in their educational studies. Finally we suggest some implications for practice in augmenting students and teachers awareness about authentic science practices using the anthropological and sociological lenses.
A Unified Theory on Some Basic Topological Concepts
T. Hatice Yalvac
Mathematics , 2008,
Abstract: Several mathematicians, including myself, have studied some unifications in general topological spaces as well as in fuzzy topological spaces. For instance in our earlier works, using operations on topological spaces, we have tried to unify some concepts similar to continuity, openness, closedness of functions, compactness, filter convergence, closedness of graphs, countable compactness and Lindelof property. In this article, to obtain further unifications, we will study $\phi_{1,2}$-compactness and relations between $\phi_{1,2}$-compactness, filters and $\phi_{1,2}$% -closure operator.
Preliminary results of land subsidence monitoring project in Konya Closed Basin between 2006–2009 by means of GNSS observations
A. Ustun,E. Tusat,S. Yalvac
Natural Hazards and Earth System Sciences (NHESS) & Discussions (NHESSD) , 2010, DOI: 10.5194/nhess-10-1151-2010
Abstract: One of the potential dangers that might arise as a result of bringing excessive amounts of groundwater to the surface of the Earth is land subsidence. Such surface deformations – these velocities may vary from a few millimetres to a few metres per year – do the greatest damage to infrastructure facilities and buildings in residential units. Agricultural lands, in which excessive irrigation is performed, and densely populated cities are more likely to suffer from land subsidence. Konya Closed Basin (KCB), where a rapid groundwater withdrawal has been observed during the last 30–40 years, is faced with such a threat. In this study, the possibility of the occurrence of land subsidence, related to groundwater withdrawal for the KCB, is assessed and the geodetic studies conducted up to now, with the intention of identifying land subsidence, are introduced. The vertical displacements of between -12 and -52 mm/year have been detected through GNSS observations collected on the 6-point test network. The land subsidence phenomenon has been developing in the areas where the groundwater is extensively used for irrigation and daily life. The results support the findings derived from the historical leveling records and point out the need of an extended study based on both GNSS and InSAR techniques for spatial and temporal mapping of land subsidence in the KCB.
Prediction of successful induction of labour w th dinoprostone in a homogeneous group of patients
Hüseyin Cengiz, Serdar Yalvac, Ali Yavuzcan, Omer Kandem r
South African Journal of Obstetrics and Gynaecology , 2012,
Abstract: Objectives. The aim of the present study was to compare the efficiency of transvaginal ultrasonography and the Bishop’s scoring system in predicting the success of labour induction. Methods. Transvaginal ultrasonography for cervical evaluation and cervical palpation for Bishop scoring were performed in all patients by the same obstetrician. This prospective study was conducted in the Perinatology and Maternity Care Unit of Etlik Zübeyde Hanim Maternity and Women’s Health Teaching and Research Hospital between September 2007 and February 2008. Eighty-four patients induced with prostaglandin E2 (dinoprostone) for medical indications were included in the study. Results. No significant association was found between transvaginal measurement of cervical length and the success of labour induction (p=0.201). We found no statistically significant difference between failure of labour induction and successful labour induction in terms of transvaginal measurement of cervical length (area under the curve (AUC) 0.583; 95% confidence interval (CI) 0.452 - 0.714). A significant association between the Bishop’s score and failure of labour induction (p=0.029) was found. A statistically significant relationship was found between failure of labour induction and successful labour induction in terms of the Bishop’s score (AUC 0.632; 95% CI 0.513 - 0.751). The best cut-off point for predicting successful labour induction was a Bishop’s score of 2 or more. The sensitivity and specificity levels associated with this point were 82.4% and 44.9%, respectively (positive predictive value 50.9% and negative predictive value 78.6%). Conclusions. Bishop’s scoring system was more successful than assessment of cervical length by ultrasound in predicting failed induction in a homogeneous group of patients in whom labour was induced with prostaglandin E2. SAJOG January 2012, Vol. 18, No. 1
Alterations in Growth Related Genes (GH-I, IGF-I and IGF-II) Expression with Acute Copper Exposure in Rainbow Trout
Ercument Aksakal,Saltuk Bugrahan Ceyhun,Sukru Beydemir,Orhan Erdogan
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2011.3334.3339
Abstract: In this study, the acute effects of copper (CuSO4.5H2O) on the expression of Growth Hormone-I (GH-I) and Insulin like Growth Factors I and II (IGF-I and IGF-II) were investigated in rainbow trout (Oncorhynchus mykiss) muscle tissue. For this purpose, rainbow trout were exposed to 100 μg L-1 (Sublethal concentration) copper sulfate in moderately hard freshwater. After 6, 12, 24 and 48 h of treatment, expression of white muscle GH-I, IGF-I and IGF-II mRNAs were measured by means of quantitative real-time PCR. During the exposure experiments, no mortalities occurred. All mRNA levels significantly decreased after copper administration (p<0.05). The results indicate that short term copper exposure suppresses the mRNA expression levels of GH-I, IGF-I and IGF-II in rainbow trout muscles.
Body Weight Reducing Effect of Oral Boric Acid Intake
Erhan Aysan, Fikrettin Sahin, Dilek Telci, Mehmet Emir Yalvac, Sinem Hocaoglu Emre, Cetin Karaca, Mahmut Muslumanoglu
International Journal of Medical Sciences , 2011,
Abstract: Background: Boric acid is widely used in biology, but its body weight reducing effect is not researched. Methods: Twenty mice were divided into two equal groups. Control group mice drank standard tap water, but study group mice drank 0.28mg/250ml boric acid added tap water over five days. Total body weight changes, major organ histopathology, blood biochemistry, urine and feces analyses were compared. Results: Study group mice lost body weight mean 28.1% but in control group no weight loss and also weight gained mean 0.09% (p<0.001). Total drinking water and urine outputs were not statistically different. Cholesterol, LDL, AST, ALT, LDH, amylase and urobilinogen levels were statistically significantly high in the study group. Other variables were not statistically different. No histopathologic differences were detected in evaluations of all resected major organs. Conclusion: Low dose oral boric acid intake cause serious body weight reduction. Blood and urine analyses support high glucose, lipid and middle protein catabolisms, but the mechanism is unclear.
Endemic Contagious Agalactia in Sheep and Goats: Clinical Evaluation, Treatment and Vaccination
Hasan Ceyhun Macun,Naci Ocal,Murat Karahan,Bugrahan Bekir Yagci,Hakan Kalender,Recep Kalin
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2010.1918.1924
Abstract: In this study, it aimed to evaluate clinical signs of Contagious Agalactia (CA) that had been affecting small ruminants in Kirikkale Province for 1.5 years and to intervene with this endemic CA by administration of enrofloxacin 5 mg kg-1 for 5 days and a single dose of meloxicam (0.5 mg kg-1) to acutely infected animals and by vaccination of the flocks. The study was conducted between July 2007 and December 2008 on a total of 745 animals of 5 different flocks with problems of mastitis, keratoconjunctivitis and arthritis. Clinically determined CA was also confirmed by PCR analysis of milk samples. Arthritis was the most frequently observed clinical sign with a rate of 71.84% in diseased animals. Arthritis was observed either as a single problem or concurrently with mastitis or ocular lesions. The co-existence rate of ocular lesions with mastistis was 2.91% while observing all three lesions concomitantly was the least frequent, 2.91%. Ocular lesions alone was not seen in ewes and goats but co-existed with other signs. Ewes and goats exhibited a higher frequency of mastitis alone with a rate of 45 and 44.83%, respectively compared to other two clinical signs. The treatment protocol mentioned above was successful as the general body condition of the clinically diseased animals was improved and subsequently no incidence of death was observed. Animals gradually recovered from mastititis and conjunctivitis and the severity of keratoconjunctivitis and arthritis was decreased. It also concluded that application of a live CA vaccine twice with a 6 month-interval was quite effective as no case of CA was observed in vaccinated flocks during a 1 year follow-up period.
Charmonium at high temperature in two-flavor QCD
Aarts, Gert;Allton, Chris;Oktay, Mehmet Bugrahan;Peardon, Mike;Skullerud, Jon-Ivar
High Energy Physics - Phenomenology , 2007, DOI: 10.1103/PhysRevD.76.094513
Abstract: We compute charmonium spectral functions in 2-flavor QCD on anisotropic lattices using the maximum entropy method. Our results suggest that the S-waves (J/psi and eta_c) survive up to temperatures close to 2Tc, while the P-waves (chi_c0 and chi_c1) melt away below 1.2Tc.
Charmonium at high temperature in two-flavor QCD
Gert Aarts,Chris Allton,Mehmet Bugrahan Oktay,Mike Peardon,Jon-Ivar Skullerud
Physics , 2007, DOI: 10.1103/PhysRevD.76.094513
Abstract: We compute charmonium spectral functions in 2-flavor QCD on anisotropic lattices using the maximum entropy method. Our results suggest that the S-waves (J/psi and eta_c) survive up to temperatures close to 2Tc, while the P-waves (chi_c0 and chi_c1) melt away below 1.2Tc.
Mesons at high temperature in Nf=2 QCD
Gert Aarts,Chris Allton,Richie Morrin,Alan O Cais,Mehmet Bugrahan Oktay,Mike Peardon,Jon-Ivar Skullerud
Physics , 2005, DOI: 10.1016/j.nuclphysbps.2006.01.033
Abstract: We report first results for spectral functions of charmonium in 2-flavour QCD. The spectral functions are determined from vector and pseudoscalar correlators on a dynamical, anisotropic lattice. J/psi and eta_c are found to survive well into the deconfined phase before melting away at T<~2T_c. Current systematic uncertainties prevent us from drawing any definite conclusions at this stage.
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