Elusive Equity—Education Reform in Post-apartheid South Africa, Edward B. Fiske, Helen F. Ladd. Brookings Institution Press, Washington, DC (2004), ISBN 0-8157-2480-9 (xiii+268pp.).     

Servaas van der Berg   《Economics of Education Review》2006,25(6):675-676

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The effect of illustrations in arithmetic problem-solving: Effects of increased cognitive load     

Inez E. Berends  Ernest C.D.M. van Lieshout 《Learning and Instruction》2009,19(4):345-353

Arithmetic word problems are often presented accompanied by illustrations. The present study examined how different types of illustrations influence the speed and accuracy of performance of both good (n = 67) and poor arithmeticians (n = 63). Twenty-four arithmetic word problems were presented with four types of illustrations with increasing information value. The results show that illustrations can have a detrimental effect on performance on arithmetic word problems, produced by irrelevant, redundant or interacting sources of information. Principles from cognitive load theory are used to explain the results, in particular in relation to (poor) working memory ability.  相似文献   

Marketing books in The Netherlands     

Ad van Muyen 《Learned Publishing》1991,4(4):219-225

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The confidential doctor in the Netherlands     

E. van Ruller 《Child abuse & neglect》1981,5(4):491-493

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Guest Editorial: Spaces,Logic, and Link Analysis in IR: Recent Advances From A Mathematical and Logical Perspective   总被引：1，自引：0，他引：1  

Sándor?DominichEmail author  Mounia?Lalmas  Cornelius?Joost ?van?Rijsbergen 《Information Retrieval》2005,8(2):175-179

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Stability of pedalling mechanics during a prolonged cycling exercise performed at different cadences     

Sarre G  Lepers R  van Hoecke J 《Journal of sports sciences》2005,23(7):693-701

The aim of this study was to analyse the effect of pedalling rate on the pattern of mechanical torque application and on neuromuscular fatigue during prolonged cycling exercise. Eleven well-trained individuals performed three 1-h pedalling sessions, at 50 rev.min-1, 110 rev.min-1 and a freely chosen cadence, at an intensity corresponding to 65% of their maximal aerobic power. The mechanical torque applied on the right pedal was recorded for 30 s every 5 min while pedalling. Contractile and neural properties of the quadriceps and hamstring muscles were analysed before and immediately after each of the three pedalling sessions. The post-exercise reduction in knee extensors maximal voluntary contraction was significant (P<0.01) irrespective of the cadence, but no difference was found between cadences. The use of a particular cadence did not lead to preferentially central or peripheral fatigue. An increase in cadence resulted in greater positive and negative work generated during pedalling. The mechanical pattern was not altered during the exercise, whatever the selected cadence. The present study demonstrates that despite the occurrence of neuromuscular fatigue, trained individuals maintained a stable pedalling pattern throughout an endurance cycling exercise for cadences ranging from 50 to 110 rev.min-1.  相似文献   

High throughput fabrication of disposable nanofluidic lab-on-chip devices for single molecule studies     

Jeroen A. van Kan  Ce Zhang  Piravi Perumal Malar  Johan R. C. van der Maarel 《Biomicrofluidics》2012,6(3)

An easy method is introduced allowing fast polydimethylsiloxane (PDMS) replication of nanofluidic lab-on-chip devices using accurately fabricated molds featuring cross-sections down to 60 nm. A high quality master is obtained through proton beam writing and UV lithography. This master can be used more than 200 times to replicate nanofluidic devices capable of handling single DNA molecules. This method allows to fabricate nanofluidic devices through simple PDMS casting. The extensions of YOYO-1 stained bacteriophage T4 and λ−DNA inside these nanochannels have been investigated using fluorescence microscopy and follow the scaling prediction of a large, locally coiled polymer chain confined in nanochannels.  相似文献   

Is the occurrence of the sticking region the result of diminishing potentiation in bench press?     

Tillaar Rv  Saeterbakken AH  Ettema G 《Journal of sports sciences》2012,30(6):591-599

In this study we investigated if the occurrence of the sticking region was a result of diminishing potentiation (coinciding delayed muscle activation) or the result of a mechanically poor region in which the muscles can produce less force. A regular one-repetition maximum (1RM) free-weight bench press was compared with isometric bench presses performed at 12 different positions. A lower force at the sticking region compared to the other regions in the isometric bench presses would confirm the mechanically-poor-position hypothesis. Twelve resistance-trained males (age 21.7 ± 1.3 years, mass 78 ± 5.8 kg, height 1.81 ± 0.05 m) were tested in 1RM and in isometric contractions in bench press in 12 different positions, indicated by the vertical distance between barbell and sternum, covering the whole range of motion during the concentric phase. Barbell kinematics and muscle activity were registered. In both types of executions a region of lower force output was observed, which supports the mechanically-poor-position hypothesis. Electromyographic activity of four muscles showed the same pattern in the isometric and 1RM attempts. It was concluded that diminishing effect potentiation could not explain the existence of the sticking region.  相似文献   

<Emphasis Type="Italic">Minerva</Emphasis> and the Development of Science (Policy) Studies     

Niels C. Taubert 《Minerva》2012,50(3):261-275

This article analyzes the transformation of Minerva from an intellectual towards a scholarly journal by making use of bibliometric methods. The aim is to provide some empirical insights that help to understand what properties of the journal changed in the course of this transformation process. Minerva was one of the first journals that reflected on science and its role in society and science policy in particular. Analyzing the development of the journal sheds light on the emergence of science (policy) studies and on Minerva’s role as a forerunner in this field. In a first step, the methods will be described. The second section provides some empirical results of the publication output of Minerva and its relations to other journals in the field. The empirical findings are put into a broader perspective in the concluding third section.  相似文献   

Interaction between the teacher and the congenitally deafblind child     

Vervloed MP  van Dijk RJ  Knoors H  van Dijk JP 《American annals of the deaf》2006,151(3):336-344

Empirical data on the development of interaction, communication, and language in deafblind children is very rare. To fill this gap, a case study was conducted in which the interaction between a teacher and a deafblind boy age 3 years 4 months was analyzed. Sequential analysis of their interaction confirmed some general clinical impressions about interaction with deafblind children, and provided the basis for suggestions on how the interaction pattern might be changed.  相似文献