819 research outputs found
Democracy Through Learner-Centered Education: a Turkish Perspective
No full textAimed at documenting the problems and constraints confronting learner-centered instruction in Turkey, this article first explains the link between democracy and education and the role of learner-centered instruction in realizing democratic ends. By drawing on John Dewey's ideas and Turkish scholars' perspectives on Turkish education, the article then presents the problems and constraints that pose threats to the implementation of learner-centered instruction in Turkey. The author also explains the problems within the Turkish educational system and teacher education programmes, and the challenges that in-service teachers and students may experience with learner-centered instruction. © Springer Science+Business Media B.V. 2008
Linkages between American and European Publicly Traded Airline Companies - Evidence Resulting from the Diebold-Yilmaz Method
No full textIn this paper, the author implemented the Diebold and Yilmaz approach to analyse the connectedness between the major American and European publicly traded airline companies. The author calculated the return and volatility spillover index for the whole sample using a dynamic rolling sample analysis. The results show that all airlines are significantly linked but there is a clear division into two markets. It was found that return spillovers are more intensive than volatility spillovers. Moreover, the average connectedness level is higher in the U.S. market for returns as well as for volatility. An increase of connectedness occurred due to the certain events: issues linked with the condition of the global economy and long-term crude oil price changes.W artykule przedstawiono wyniki badania powiązań w świetle metody Diebolda i Yilmaza pomiędzy notowaniami najważniejszych linii lotniczych w Stanach Zjednoczonych i w Europie. Wyznaczono indeks powiązań dla dziennych zwrotów i zmienności dla całej próby oraz w ujęciu dynamicznym. Wyniki badania wskazują, że notowania wszystkich analizowanych linii lotniczych są ze sobą powiązane, ale istnieje wyraźny podział na dwa rynki. Powiązania między rynkiem europejskim a amerykańskim są znacznie słabsze niż efekty zarażania pomiędzy liniami lotniczymi z jednego rynku. Efekty zarażania są silniejsze dla zwrotów niż dla zmienności. Ponadto średni poziom indeksu powiązań jest wyższy w Stanach Zjednoczonych niż w Europie. Na zmiany poziomu powiązań w czasie miały wpływ wydarzenia z otoczenia makroekonomicznego i rynku kapitałowego oraz długotrwała zmiana poziomu ceny ropy naftowej
Conservation of Selected Churches in the Most Region and Karviná Region and their Significance for Geotourism
No full textAbstractCoal mining in the Czech Republic has left significant marks on the geomorphology of the regions. Simultaneously, it has also affected the lives of people who have lived there for centuries. This article selects two areas, where the consequences of mining are pronounced. It compares the open cast mining in the brown coal deposit in Most and the underground mining of hard coal in the Karviná Region. Only few monuments have survived out of the original buildings. Certain landmarks are the churches that appear in both of the localities. In Most the original church was relocated by almost one kilometre to another place. The Karviná Region has several churches that have tilted due to mining subsidence. The buildings are the witnesses of the original settlements and suitable destinations for tourists. Overall, the areas have high potentials for the development of non-traditional forms of tourism, especially geo-montane tourism
A Study on the Performance of GPR for Detection of Different Types of Buried Objects
No full textAbstractThe objective of this research is to evaluate the applicability of Ground Penetrating Radar (GPR) method to detect burried objects in the shallow depths using 250 MHz and 800 MHz center frequency antennas. For this purpose, different objects were burried in several places of a certain test site. GPR data were collected along six paralel profiles using 250 MHz and 800 MHz antennas which are compatible with RAMAC CU II system. The reflections profile data were processed using the computer program ReflexW. After the processing of data, the reflected /scattered reflections on the processed radargrams were examined and the radargrams were interpreted to determine the depths and positions of the objects from the surface. Also, the data obtained from 250 and 800 MHz antennas were compared and the differences between them in terms of resolution were discussed
Churches Influenced by Underground Mining in the Karvina Region Used for the Purposes of Geotourism
No full textAbstractThe article aims to point out the mutual relations between underground mining and its manifestations on the ground surface. For the purpose, churches in the Karviná Region were selected. The buildings have been affected by over 200-year long extraction of hard coal. Some of the buildings have been influenced from the start of the mining activities, others later on. Thanks to the combined effects of the historical significance of the monuments and their diversion from the vertical axis, the buildings have become even more interesting. Moreover, they clearly document how the anthropogenic mining activities influence the built-up area. Some of the buildings have been preserved to date, some had to be demolished, unfortunately. Nowadays, the monuments are becoming significant sites of geotourism interest
Monuments of the Czech Republic on the UNESCO World Heritage Site List and their Significance for Geotourism
No full textAbstractThe article presents the monuments from the Czech Republic enlisted on the UNESCO World Heritage Site List. Each country tries to choose representative sites and monuments that document the structural and architectural development in a given region. Therefore, the Czech Republic carried out an analysis of their monuments. As the Czech Republic has a very rich and expressive history in the very centre of Europe, its history has significantly affected its civil engineering and architecture. It is also a country with a varied geological structure and geomorphology. Today's untraditional forms of tourism, among which we also find geotourism, may thus build on such knowledge and expand the current offer of destinations. Learning about the geological structure is also important in terms of future renovation and reconstruction work. The current list of UNESCO cultural sites will be expanded by further unique sites and buildings. For this reason, it is important to combine knowledge from more specialised disciplines, such as geology and mining science
Yoğun bakım ünitelerinden izole edilen Pseudomonas aeruginosa suşlarının bazı antibiyotiklere duyarlılıkları
No full textCore Loss Estimation in Electric Machines With Flux-Controlled Core Loss Tester
No full textTsukerman, Igor/0000-0001-8318-3225; Tekgun, Burak/0000-0003-2720-8816; Sozer, Yilmaz/0000-0003-3971-3967The complexity of core loss estimation is a serious challenge in the design of high-efficiency electric machines. Current estimation methods based on the Steinmetz equation and loss separation are not accurate enough, even at the rated conditions. This paper describes a loss estimation technique combining finite-element analysis (FEA) and actual core loss measurements. First, flux density waveforms in various parts of the electric machine are determined using FEA. Second, the same waveforms are generated in a wound toroidal core made of the same material as used in the machine. The loss is measured per unit mass, and then the total motor core loss is calculated by integrating the measured W/kg loss values for predefined sections of the motor. These estimation results are compared with those of the Bertotti method. The proposed procedure is shown to improve the accuracy of loss estimation.ABB US Corporate Research; U.S. National Science Foundation [DMS-1620112]This work was supported by fellowships from ABB US Corporate Research. The work of I. Tsukerman was supported in part by the U.S. National Science Foundation under Grant DMS-1620112. (Corresponding author: Yilmaz Sozer.
Związek między stężeniami lipokaliny-2 i testosteronu wolnego w zespole policystycznych jajników
No full text
Introduction: Lipocalin-2 is an adipokine that is mainly produced from adipocytes and macrophages. Data related to PCOS and other obesity-associated disorders have shown divergent results. Here, we studied lipocalin-2 concentrations in women with PCOS and in healthy women, and investigated the potential contributors underlying lipocalin association with PCOS.
Material and methods: Forty-four women with PCOS and 47 age- and BMI-matched healthy women were enrolled. Fasting serum glucose, insulin, homeostasis model assessment of insulin resistance (HOMA-IR), high-sensitivity C-reactive protein (hs-CRP), and free testosterone levels were measured. The body fat percentage was measured by bioelectrical impedance.
Results: Lipocalin-2 concentrations were significantly higher in the PCOS group than in the control group (55.74 ± 17.54 ng/mL vs. 36.46 ± 19.62 ng/mL, p = 0.011). There was a correlation between lipocalin-2 levels and free testosterone. In a multiple regression model, the body fat percentage, HOMA-IR, and hs-CRP were not associated with lipocalin-2. However, only free testosterone was associated with lipocalin-2. A “lipocalin-2 = 11.214 + (1.943 × free-testosterone)” equation was obtained.
Conclusions: Serum lipocalin-2 levels were higher in women with PCOS, and only free testosterone was associated with lipocalin-2. Lipocalin-2 levels and their influencing factors have discrepant results in both PCOS and other obesity- or insulin resistance-related metabolic disorders. Thus, the potential role of lipocalin-2 in PCOS should be clarified. (Endokrynol Pol 2017; 68 (1): 7–12)
Wstęp: Lipokalina-2 to adipokina produkowana głównie przez adipocyty i makrofagi. Wyniki badań dotyczących zespołu policystycznych jajników (PCOS) i innych zaburzeń związanych z otyłością są rozbieżne. Autorzy ocenili stężenia lipokaliny-2 kobiet z PCOS i u zdrowych kobiet oraz zbadali potencjalne czynniki determinujące związek lipokaliny z PCOS.
Materiał i metody: Do badania włączono 44 kobiety z PCOS i 47 dobranych pod względem wieku i wskaźnika masy ciała zdrowych kobiet. Zmierzono stężenie glukozy i insuliny w surowicy na czczo, wskaźnik insulinooporności w modelu homeostazy HOMA-IR, stężenie białka C-reaktywnego oznaczonego metodą wysokoczułą (hs-CRP) i testosteronu wolnego. Zmierzono również procentową zawartość tkanki tłuszczowej w organizmie, stosując metodę impedancji bioelektrycznej.
Wyniki: Stężenia lipokaliny-2 były istotnie wyższe w grupie PCOS niż w grupie kontrolnej (55,74 ± 17,54 ng/ml vs. 36,46 ± 19,62 ng/ml, p = 0.011). Stwierdzono korelację między stężeniami lipokaliny-2 i testosteronu wolnego. W modelu regresji wielokrotnej nie wykazano zależności między procentową zawartością tkanki tłuszczowej w organizmie, wskaźnikiem HOMA-IR i stężeniem hs-CRP a stężeniem lipokaliny-2. Stwierdzono tylko związek między stężeniami testosteronu wolnego i lipokaliny-2. Zależność tę opisuje równanie: stężenie lipokaliny-2 = 11,214 + (1,943 × stężenie testosteronu wolnego).
Wnioski: Stężenia lipokaliny-2 w surowicy były wyższe u kobiet z PCOS. Jedynym parametrem związanym ze stężeniem lipokaliny-2 było stężenie testosteronu wolnego. Dane dotyczące stężenia lipokaliny-2 i wpływających na nie czynników w PCOS i innych zaburzeniach metabolicznych związanych z otyłością lub insulinoopornością są rozbieżne. Potencjalna rola lipokaliny-2 w PCOS wymaga wyjaśnienia. (Endokrynol Pol 2017; 68 (1): 7–12)
Prevalance of Metallo-Beta Lactamase Among Pseudomonas aeruginosa Isolates Resistant to İmipenem
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