Zur öffentlichen Prüfung und Redeübung der Schüler des Gymnasiums, des Realgymnasiums und der Vorschule ... ladet ergebenst ein / Nikolaus II. von Werle

von August StichertErschienen: Teil 1 -

The Milwaukee Division of the American Jewish Congress 1933-1945: The Limits of a Local Jewish Organization During a Period of International Crisis

This paper examines the limits of a local Jewish organization between 1933-1944 which were turbulent years for the Jewish people in America and abroad. The American Jewish Congress and many other Jewish organizations in America participated in activities designed to combat anti-Semitic policies in America and abroad. The Milwaukee Division of the American Jewish Congress was given the duty to implement the policies adopted by the national office. The Milwaukee Division had limited success implementing these policies. Sometimes it appeared that the Milwaukee Division chose to simply neglect the requests made by the American Jewish Congress. However, after taking a closer look it appears that the Milwaukee Division was suffering from internal problems which affected its ability to implement the policies of the American Jewish Congress

Fen alanı öğretmen adaylarının mesleklerine yönelik algıları ve öğretmenliği meslek olarak seçme nedenleri.

This study indented to explore preservice elementary and secondary science teacher̕s perception of their professional roles and investigate their reasons of choosing teaching as a profession. To explore the perception of professional roles, metaphorical images were also used as a tool. The present study was conducted during the spring semester of 2004-2005 academic year with a total number of 441 (n=287 females; n=153 males and n=1 gender not provided) senior preservice elementary and secondary science teachers who enrolled in the elementary science and secondary science (biology, physics and chemistry) teacher education programs of three different universities in Ankara. Data were collected utilizing a questionnaire developed by Saban (2003) composed of five basic sections which investigates the participant̕s perception of teaching as a profession and their roles in instruction process and reasons of choosing teaching as a profession. Data of the present study were analyzed utilizing descriptive and inferential statistics. Analysis of the data showed that preservice teachers perceive their roles mostly with student-centered metaphors and define their selves as pedagogical expert who fosters student̕s social, emotional, and moral growth. Besides, most of the preservice teachers have altruistic reasons to choose teaching as a profession.M.S. - Master of Scienc

Influence of Crystallite Size on the Properties of Zirconia

Systematic studies on the properties of zirconia for catalytic applications revealed that the concentration of the stock solution, from which precipitation is carried out, strongly influence the crystallite size of the resulting zirconia. The crystallite size influences the BET surface area, the crystallization temperature, and the phase transition temperature. The findings of this study clarify the parameters governing the formation of specific phase with desired surface areas

Synthèse de zircones mésoporeuses de haute surface

Il est montré que des oxydes de zirconium mésoporeux et de haute surface spécifique peuvent être préparés à partir de l'hydrolyse de ZrOCl2 8 H2O, en présence de tensioactif (CTAB). Les hautes aires spécifiques sont attribuées à la formation de clusters agrégés sous la forme de petites particules. Le temps de réaction est le paramètre qui paraît gouverner l'obtention des hautes aires spécifiques ainsi que la structure cristalline des matériaux calcinés. Un mécanisme de synthèse prenant en compte ces différents paramètres et conduisant à la formation d'oxydes de zirconium divisés est proposé

Monoclinic and Tetragonal High Surface Area Sulfated Zirconias in Butane Isomerization: CO Adsorption and Catalytic Results

In the present study high surface area monoclinic and tetragonal sulfated zirconia samples both active in n-butane isomerization were prepared from the same hydroxide precursor in a novel one-step hydrothermal process. The process is studied via analysis of intermediate stages of the product formation. The monoclinic samples show a catalytic activity in n-butane isomerization lower by about a factor of 4 compared to the tetragonal samples, although the acidity as analyzed by CO adsorption was found to be similar. This suggests, that it is not only the acidity of sulfated zirconia that determines the catalytic performance. The results support the bimolecular mechanism, for which a favorable arrangement of surface groups is necessary. The surface structure of tetragonal zirconia seems to be better suited than that of the monoclinic zirconia, although the presented monoclinic zirconia performs substantially better than claimed in many publications, where the monoclinic phase is typically assumed to be inactive