Professional knowledge affects action-related skills: The development of preservice physics teachers' explaining skills during a field experience     

Christoph Kulgemeyer  Andreas Borowski  David Buschhüter  Patrick Enkrott  Maren Kempin  Peter Reinhold  Josef Riese  Horst Schecker  Jan Schröder  Christoph Vogelsang 《科学教学研究杂志》2020,57(10):1554-1582

Professional knowledge is an important source of science teachers' actions in the classroom (e.g., personal professional content knowledge [pedagogical content knowledge, PCK] is the source of enacted PCK in the refined consensus model [RCM] for PCK). However, the evidence for this claim is ambiguous at best. This study applied a cross-lagged panel design to examine the relationship between professional knowledge and actions in one particular instructional situation: explaining physics. Pre- and post a field experience (one semester), 47 preservice physics teachers from four different universities were tested for their content knowledge (CK), PCK, pedagogical knowledge (PK), and action-related skills in explaining physics. The study showed that joint professional knowledge (the weighted sum of CK, PCK, and PK scores) at the beginning of the field experience impacted the development of explaining skills during the field experience (β = .38**). We interpret this as a particular relationship between professional knowledge and science teachers' action-related skills (enacted PCK): professional knowledge is necessary for the development of explaining skills. That is evidence that personal PCK affects enacted PCK. In addition, field experiences are often supposed to bridge the theory-practice gap by transforming professional knowledge into instructional practice. Our results suggest that for field experiences to be effective, preservice teachers should start with profound professional knowledge.  相似文献   

Embedding inquiry-based practices in schools: The strategic role of school leaders     

Femke Geijsel  Wouter Schenke  Jan van Driel  Monique Volman 《European Journal of Education》2020,55(2):233-247

The context of this study were research and development projects in Dutch secondary education, particularly funded by government to combine practice-based research with school development goals for inquiry-based culture. Aiming at better understanding of the strategic role that school leaders play in embedding inquiry-based practices in schools, the research question of this study was to explore to what extent and how do school leaders use the opportunity of participating in funded research and development projects for encouraging and integrating inquiry-based practices in their schools? Differences concerning the integration of inquiry-based working in the school as professional learning community were examined, distinguishing between school leaders’ strategies of capacity building. Twenty-eight school leaders of Dutch secondary schools, involved in nineteen projects, were interviewed retrospectively. Analyses showed the majority of the school leaders to be convinced that inquiry-based working is important for their schools’ development as a professional community. Their strategies for achieving school level project significance differed in school leaders’ successive attention on personal or interpersonal capacity building with regard to inquiry-based practices. Moreover, while some school leaders were actively involved with capacity building right from the start of the research and development projects projects, almost two-third of the school leaders developed interest in inquiry-based practices during the projects and started to enact in the final year of the project. In discussing the results, it is proposed that the interaction of strategy and context needs further study, for instance to inform peer learning among school leaders that are novice and experienced in inquiry-based practices as a means to develop the school as a professional learning community.  相似文献   

Beyond Student Evaluation of Teaching: Identifying and addressing academic staff development needs     

Roy Ballantyne  Jill Borthwick  Jan Packer 《Assessment & Evaluation in Higher Education》2000,25(3):221-236

Student evaluation of teaching is a commonly accepted means of obtaining feedback on the quality of university teaching. However, its usefulness in contributing to improved teaching performance is dependent on the extent to which staff respond to and apply the information obtained in this way. This paper reports the results of a project designed to extend the application of student evaluations by using them as the basis for staff development. Survey findings from 87 staff and 127 students indicate the priorities for academic and course development perceived by each group. Booklets based on these perceived needs were developed by collaborative staff-student groups and made available to enable staff to improve their teaching in response to student evaluations.  相似文献   

Learning without frontiers: Building integrated responses to diverse learning needs     

Jan Visser  David Berg 《Educational technology research and development : ETR & D》1999,47(3):101-114

  相似文献   

Good Intentions Are Not Enough: A Story of Collaboration in Science, Education, and Technology     

Angelo Collins  Lynne Bercaw  Amy Palmeri  Jan Altman  Marcy Singer-Gabella  Todd Gary 《Journal of Science Teacher Education》1999,10(1):3-20

  相似文献   

Upper extremity bone mineral content asymmetries in tennis players: A systematic review and meta-analysis     

Laurent Chapelle  Nikki Rommers  Peter Clarys  Eva D’Hondt  Jan Taeymans 《Journal of sports sciences》2019,37(9):988-997

The aim of this study was to examine the magnitude of upper extremity bone mineral content (BMC) asymmetries in tennis players. Furthermore, the influence of sex (male versus female versus mixed), chronological age (juniors: < 18 years; adults: 18–39 years and seniors: ≥ 40 years) and starting age (early starters: < 14 years and late starters: > 18 years) on these asymmetries were examined. Two databases were searched for scientific articles that examined upper extremity BMC in tennis players. Pooling of the individual study effect sizes was conducted using the random-effects model. Three subgroup analyses were performed based on sex, chronological age and starting age. Out of the 15 included studies 24 effect sizes were extracted resulting in a significant difference in BMC value between the dominant and nondominant upper extremity of the tennis players (Standardised Mean Difference: 0.85 [95% CI: 0.67–1.03]). The three subgroup analyses all showed medium to strong effect sizes and significant intergroup differences. To conclude, BMC was significantly higher in the dominant upper extremity compared to the nondominant upper extremity in tennis players. Nevertheless, the influence of training volume and playing experience on these asymmetries are yet to be examined.  相似文献   

May I have this dance? Dance participation and attendance in Denmark     

Karol Jan Borowiecki  Catarina Marvão 《Cultural Trends》2017,26(2):155-167

Although dancing is considered to be an important arts form, and is associated with various positive externalities, our understanding of the profiles of dancers and dance audiences are limited. We address the gap in the literature by exploiting survey data on cultural preferences and habits in Denmark for 2004. Our approach has allowed us to identify the socio-economic background of dancers, as well as their involvement in other cultural activities. Among other factors, we note that dancers are more frequent attendees at dance performances, than non-dancers; that they have typically lower incomes and tend to read more, play more video games and visit art exhibits more often. We are further able to separate the sample of dancers in relation to various types of dance practised, allowing us to provide insights on the differences between them.  相似文献   

Associations between physical activity and health-related fitness – volume versus pattern     

Sara Knaeps  Jan G. Bourgois  Ruben Charlier  Evelien Mertens  Johan Lefevre 《Journal of sports sciences》2017,35(6):539-546

Approximately 3.2 million people die of non-communicable diseases (NCD) each year due to insufficient physical activity. Physical activity guidelines are possibly perceived as too demanding and might thus pose a barrier. We addressed the question if a more stable physical activity pattern is associated with higher levels of health-related fitness than one with high and low intensities, regardless of the physical activity level (PAL). Physical activity was objectively measured in 296 men and women (53.7 ± 8.94 years) with the SenseWear Pro Armband^®. Using this data, the PAL and a Gini index were calculated to report the physical activity pattern. Health-related fitness was expressed as a fitness index. PAL was weakly correlated to health-related fitness (r = 0.38, P < .0001). The Gini index was also weakly correlated to the fitness index (r = 0.23, P < .0001). Results of the ANCOVA showed that participants in the first quartile of PAL always scored significantly lower for health-related fitness than participants in quartile four, after adjustment for the Gini index. These results suggest that as long as the volume of physical activity is high, health-related fitness will be high as well, independent of the physical activity pattern or variability in intensities throughout the day.  相似文献   

Identification of red colorants in van Gogh paintings and ancient Andean textiles by microspectrofluorimetry     

Ana Claro  Maria J. Melo  J.Sérgio Seixas de Melo  Klaas Jan van den Berg  Aviva Burnstock  Meredith Montague  Richard Newman 《Journal of Cultural Heritage》2010,11(1):27-34

Red lake pigments and dyes used in works of art were characterized by microspectrofluorimetry, a new tool in the field of cultural heritage. Emission and excitation spectra were obtained with high spatial resolution (8–30 μm) in cross-sections from paintings by Vincent van Gogh and Lucien Pissarro and from millenary Andean textiles. The fluorophores were identified by comparing their spectra with those from historic reconstructions assembled in a database. In the paints, purpurin and eosin lakes were detected. In the Paracas and Nasca textiles, dated from 200 B.C. to A.D.1476, purpurin and pseudopurpurin were the red dyes used. Carminic acid was detected in textiles dated close to the Inca Empire, A.D. 1000–1476. The results obtained with this new technique were confirmed and are in agreement with those obtained with conventional methods, requiring microsampling, such as HPLC-DAD-MS and SEM-EDX.  相似文献   

Evaluation and management of leukolysis-mediated pseudohyperkalemia in paediatric leukemic samples     

Lourens Jan Peter Nonkes  Valrie de Haas  Hans Kemperman  Albert Huisman  Ruben Eduardus Antonius Musson  Wouter Marcel Tiel Groenestege 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2022,32(1)

IntroductionLeukolysis-related pseudohyperkalemia due to preanalytical procedures may lead to erroneous (or absence of) treatment based on an invalid lab test result. We aimed to obtain a leukocyte threshold above which leukolysis-related pseudohyperkalemia becomes clinical relevant. Secondly, temporal dynamics of treatment-induced leukocyte decrease were studied to allow tailored implementation of laboratory information system (LIS) decision rules based on the leukocyte threshold to avoid leukolysis-related pseudohyperkalemia.Materials and methodsPotassium results of AU5811 routine chemistry (Beckman Coulter, Brea, California, USA) and iStat point of care (POC) (Abbott Diagnostics, Chicago, Illinois, USA) analysers were compared, the latter method being insensitive to leukolysis caused by pre-analytical procedures. Potassium results were combined with leukocyte counts obtained using a Cell-Dyn Sapphire haematology analyser (Abbott Diagnostics, Santa Clara, California, USA), resulting in 132 unique data triplets. Regression analysis was performed to establish a leukocyte threshold. The Reference Change Value (√2 x Z x √(CV_a² + CV_i²)) was used to calculate maximum allowable difference between routine analyser and POC potassium results (delta_max + 0.58 mmol/L). Temporal analysis on the treatment-induced leukocyte decrease was performed by plotting leukocyte counts in time for all patients above the threshold leukocyte count (N = 41).ResultsEstablished leukocyte threshold was 63 x10⁹/L. Temporal analysis showed leukocyte counts below the threshold within 8 days of treatment for all patients.ConclusionsBased on performed analyses we were able to implement LIS decision rules to reduce pseudohyperkalemia due to preanalytical procedures. This implementation can contribute to a reduction in erroneous (or absence of) treatments in the clinic.  相似文献