School Policies and Practices at Upper Secondary Schools in Turkey According to PISA 2009 Data
In this study, the question “According to PISA 2009 data, what is the situation of the school policies and practices at upper secondary schools in Turkey?” was answered. Study group included 150 principals at upper secondary schools, which were taken into PISA 2009 Turkey sample. The data related to school policies and practices used in this study were derived from OECD database of which were the responses of school principals to the questions placed in the part F of the PISA 2009 school questionnaire. The dimensions of study are as follows: The considered factors in admitting students to school; grouping students; the reasons for transferring students; using assessment of student data in declaration/transparency and monitoring-developing; the methods for monitoring the practice of teachers; using assessment of student data in evaluation of teachers’ and principal’s performance. Using data from the PISA 2009, the findings suggest that equity is not taken sufficiently into account for school policies and practices, and administrative accountability is used predominantly rather than professional accountability.
PISA 2003 Sonuçlarına göre Öğrenci ve Sınıf Özelliklerinin Matematik Okuryazarlığına ve Problem Çözme Becerilerine Etkisi
Uluslararasi Ogrenci Basari Belirleme Programi (PISA), 15 yas cocuklarinin kazandigi bilgi ve beceriler uzerinde uc yillik aralarla yapilan bir tarama calismasidir. Calismada, Turkiye, Finlandiya ve Yunanistan’a ait PISA 2003 verileri kullanilarak, ogrencilerin matematik okuryazarliklarina ve problem cozme becerilerine etki eden ogrenci, aile ve sinif ile ilgili faktorler arastirilmis ve her bir ulke icin yapisal esitlik modelleri kurularak karsilastirilmistir. Mevcut durumun irdelenmesi, basariyi etkileyen faktorlerin neler oldugunun tespit edilmesi, diger ulkelerle karsilastirma calismalarinin yapilmasi onemlidir. Calismada, PISA 2003 ogrenci anket verilerindeki degiskenlerle acimlayici faktor analizi yapildiktan sonra LISREL ile dogrulayici faktor analizi yapilmistir. Ulkelerin faktor analizi sonuclari birbirine paralel cikmis ve belirlenen ortuk degiskenlerle yapisal esitlik modelleri kurulmustur
Characterization of ceramic composite membrane filters for hot gas cleaning
Abstract Novel composite ceramic membrane filters suitable for hot gas cleaning operations have been prepared from fly ash and titania particles on stainless steel woven mesh substrates. Both membranes had a structure like a solid packed bed with a thickness of less than 100 μm. In the domain of laminar flow, significant differences in the pressure drop between experimental results and those predicted from the Kozeny-Carman relationship were found, particularly for flow through the titania membrane. Membrane filters with extremely small pores such as the titania membrane are greatly affected by slip up to 80% in permeability at elevated temperatures. Efficiencies of filtration of typical coal fired power station exhaust fly ashes were found to be greater than 909% for both titania and ash membranes, whilst there was greater variation in the pressure drops in the ash membrane than in the titania at typical gas flows.