Der Vorschlag zur Rektorswahl und seine (Un-)Anfechtbarkeit

In der bisherigen praktischen Umsetzung der Regelungen des UnivG 2002 zur Rektorswahl sind mehrfach Probleme aufgetreten, die vor allem vom suboptimalen Zusammenspiel zwischen vorschlagendem Senat und auswählendem Universitätsrat herrühren. Angesichts der für 2009 in Aussicht genommenen umfangreicheren Novellierung des UnivG 2002, sollen hier einige diesbezüglich zentrale Problemlagen behandelt werden.     

42CrMoVNbTi细晶高强钢的拉伸性能和微观组织分析

本文主要研宄了不同晶粒尺寸的42CrMoVNbTi细晶高强钢拉伸性能和微观组织。结果表明，经组织细化处理，42CrMoVNbTi钢具有较高的强度和塑性，其微观组织为细小的马氏体板条，在板条内和板条间有大量的颗粒状碳化物弥散析出。     

The impact of financial inclusion on digital payment solution uptake within the Gulf Cooperation Council Economies

Recognizing the role of society in the sustainability of payment system innovation through the quadruple helix framework, this study analyzes the causal influence of demand-side financial inclusion indicators on society's uptake of digital payment solutions (DPS) within the regional economy of the Gulf Cooperation Council. To this end, the present study relies on data extracted from Global Findex surveys (in 2014 and 2017), as well as the economic theory of random utility maximization, to model individuals' DPS uptake decisions “ceteris paribus.” The maximum likelihood estimation revealed no gender-based gradient in DPS uptake behaviors; additionally, financial inclusion indicators such as transaction account ownership and debit card ownership did not significantly influence endogenous or exogenous DPS uptake decisions between 2013 and 2017. However, all remaining financial inclusion indicators did significantly influence DPS uptake. Assessing these findings through the lens of open innovation and the ongoing efforts from the Arab Regional Payment System project, which seeks to expand financial inclusion by facilitating access to transaction accounts, there is reasonable evidence to suggest that complementary financial inclusion policies addressing the use dimension of DPS (i.e., extending access to saving and borrowing, along with digital payroll practices for both private and public enterprises) would contribute to more effective policy on financial inclusion in the region.     

Assessment drives learning: The effect of central exit exams on curricular knowledge and mathematical literacy

In this paper, we use data from the German PISA 2003 sample to study the effects of central exit examinations on student performance and student attitudes. Unlike earlier studies we use (i) a value-added measure to pin down the effect of central exit exams on learning in the last year before the exam and (ii) separate test scores for mathematical literacy and curriculum-based knowledge. The findings indicate that central exit exams improve curriculum-based knowledge but do not affect mathematical literacy. Students, although showing a better performance, are less intrinsically motivated in school.     

SO42－／TiO2－La2 O3催化合成耐寒增塑剂癸二酸二正己酯

合成固体超强酸催化剂 SO42－／TiO2－La2 O3,并用于合成癸二酸二正己酯。结果表明,500℃焙烧3h 所得催化剂活性最好;采用正交实验法对影响酯化反应的因素进行考察,最优工艺条件：n（酸）∶n（醇）＝1∶3．0,催化剂用量1．3％（总物料）,反应时间2．5h,最高酯化率为98．5％。且该催化剂具有良好的重复使用和再生能力。     

Toward a theory of teaching: A social learning view

Two hypotheses were investigated: Do teachers spontaneously use modeling techniques during instruction, and are teachers who are trained to use these procedures more effective? Twenty-four teachers attempted to instruct a like number of 5-year-olds to seriate length. Twelve additional youngsters served as uninstructed controls. Untrained teachers made little use of modeling techniques and were generally ineffective. Trained teachers were significantly more effective than their untrained counterparts. Teacher use of specific modeling behaviors correlated with teaching success. The results were discussed from a Social Learning Theory view of teaching.     

第42届IMO第二题的证明与加强

本文给出了第42届IMO第二题的一个简捷证明与一个加强,丰富了权方和不等式的使用功能.     

固体超强酸Fe2O3-SO42-催化合成己二酸二辛酯

用固体超强酸Fe2O3-SO42-为催化剂、己二酸和辛醇为原料合成己二酸二辛酯的过程中,催化剂的活化温度、催化剂的用量、醇酸比、反应时间对收率都有较大的影响.研究表明,己二酸的用量在0.1 mol的情况下,用固体超强酸Fe2O3-SO42-为催化剂,催化剂的活化温度500℃,催化剂用量1.5 g,醇酸比31,反应时间2.5 h,是最适宜的反应条件,酯收率达85%.     

一道IMO赛题的新隔离推广及其应用

利用Holder不等式和算术--几何均值不等式,研究了第42届国际数学奥林匹克竞赛的第2题的一个新的隔离推广,并给出了推广结论的应用.