Zeit der Veränderung     

Prof. Dr. Ralf Brand  Claudia Voelcker-Rehage 《Sportwissenschaft》2013,43(2):83-84

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Diagnosis and prediction of learning success     

Ralf Schwarzer 《Studies in Educational Evaluation》1980,6(2):195-207

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In the market for ideas: how reforms in the political economy of educational research in the US and UK promote market managerialism     

Ralf St Clair  Alisa Belzer 《比较教育学》2007,43(4):471-488

Transformations in educational research structures in the United States and UK over the past decade are examined, and it is argued that these changes are manifestations of wider forces. Rather than internal developments in the field, they are better understood as serving the changing interests of the state in an era of increasingly globalized capital. The argument that the imposed changes improve the quality of educational research is shown to be inconclusive. It is suggested that these structural transformations can be seen as an attempt to promote market managerialism in educational research for political ends.  相似文献   

Dokumentarische Methode und sozialwissenschaftliche Hermeneutik     

Ralf?BohnsackEmail author 《Zeitschrift für Erziehungswissenschaft》2003,6(4):550-570

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Comparison of Individual Criteria and Externally Imposed Criteria for Stage Allocation: Findings from an Internet Study Addressing Physical Activity     

Jana Richert  Sonia Lippke  Ralf Schwarzer 《Measurement in physical education and exercise science》2013,17(4):225-240

Stage-matched interventions can only be more effective than “one-size-fits-all” interventions if they target participants' specific needs. Therefore, individuals must be allocated to a stage that truly reflects their mindsets. Various criteria for stage allocation exist. This study's objective was to demonstrate the impact of different classification criteria on stage allocation, and which criterion yields the best reflection of individuals' mindsets. The sample consists of 569 internet users. Physical activity, intention to change, and four stages of change (Non-Intender, Intender, Maintaining Actor, and Changing Actor) were assessed. Staging was based on two criteria: individual criteria and externally imposed criteria (30 min of physical activity on at least 4 days of the week). Hypotheses were tested by multivariate analyses and validity tests. As predicted, the different criteria affected stage allocation, and staging based on the individual criterion seemed to reflect individuals' intention to change and behavior better than staging based on the external standard.  相似文献   

A computational fluid dynamics model for wind simulation: model implementation and experimental validation     

Zhuo-dong?ZhangEmail author  Ralf?Wieland  Matthias?Reiche  Roger?Funk  Carsten?Hoffmann  Yong?Li  Michael?Sommer 《浙江大学学报(A卷英文版)》2012,13(4):274-283

To provide physically based wind modelling for wind erosion research at regional scale, a 3D computational fluid dynamics (CFD) wind model was developed. The model was programmed in C language based on the Navier-Stokes equations, and it is freely available as open source. Integrated with the spatial analysis and modelling tool (SAMT), the wind model has convenient input preparation and powerful output visualization. To validate the wind model, a series of experiments was conducted in a wind tunnel. A blocking inflow experiment was designed to test the performance of the model on simulation of basic fluid processes. A round obstacle experiment was designed to check if the model could simulate the influences of the obstacle on wind field. Results show that measured and simulated wind fields have high correlations, and the wind model can simulate both the basic processes of the wind and the influences of the obstacle on the wind field. These results show the high reliability of the wind model. A digital elevation model (DEM) of an area (3800 m long and 1700 m wide) in the Xilingele grassland in Inner Mongolia (autonomous region, China) was applied to the model, and a 3D wind field has been successfully generated. The clear implementation of the model and the adequate validation by wind tunnel experiments laid a solid foundation for the prediction and assessment of wind erosion at regional scale.  相似文献   

Process integration,information sharing,and system interoperation in government: A comparative case analysis     

Hans Jochen Scholl  Herbert Kubicek  Ralf Cimander  Ralf Klischewski 《Government Information Quarterly》2012

In recent years, government agencies on all levels and in all branches have increasingly engaged in harmonizing business processes, standardizing information sharing, and interoperating their information systems, which indicates a rising need for intra- and inter-government collaboration. Simultaneously, the technical capacity for process integration, information sharing, and system interoperation/interoperability (INT-IS-IOP) has also greatly increased. While a number of INT-IS-IOP projects have faced serious challenges leading to problematic project outcomes, other projects have produced the desired results. Using the amended Scholl/Klischewski (2007) framework this study systematically analyzes documents of nineteen cases of mostly successful projects, which were carried out across Europe. Based on the results of this analysis, we identify and document key foci and characteristics of successful projects. The comparative case analysis also helps assess the explanatory power of the Scholl/Klischewski framework, its applicability to practice, and its utility for evaluative purposes.  相似文献