Child soldiers in the culture wars     

Gerard Guthrie  Richard Tabulawa  Michele Schweisfurth  Padma Sarangapani  Wayne Hugo  Volker Wedekind 《Compare》2015,45(4):635-654

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An integrated platform enabling optogenetic illumination of Caenorhabditis elegans neurons and muscular force measurement in microstructured environments     

Zhichang Qiu  Long Tu  Liang Huang  Taoyuanmin Zhu  Volker Nock  Enchao Yu  Xiao Liu  Wenhui Wang 《Biomicrofluidics》2015,9(1)

Optogenetics has been recently applied to manipulate the neural circuits of Caenorhabditis elegans (C. elegans) to investigate its mechanosensation and locomotive behavior, which is a fundamental topic in model biology. In most neuron-related research, free C. elegans moves on an open area such as agar surface. However, this simple environment is different from the soil, in which C. elegans naturally dwells. To bridge up the gap, this paper presents integration of optogenetic illumination of C. elegans neural circuits and muscular force measurement in a structured microfluidic chip mimicking the C. elegans soil habitat. The microfluidic chip is essentially a ∼1 × 1 cm² elastomeric polydimethylsiloxane micro-pillar array, configured in either form of lattice (LC) or honeycomb (HC) to mimic the environment in which the worm dwells. The integrated system has four key modules for illumination pattern generation, pattern projection, automatic tracking of the worm, and force measurement. Specifically, two optical pathways co-exist in an inverted microscope, including built-in bright-field illumination for worm tracking and pattern generation, and added-in optogenetic illumination for pattern projection onto the worm body segment. The behavior of a freely moving worm in the chip under optogenetic manipulation can be recorded for off-line force measurements. Using wild-type N2 C. elegans, we demonstrated optical illumination of C. elegans neurons by projecting light onto its head/tail segment at 14 Hz refresh frequency. We also measured the force and observed three representative locomotion patterns of forward movement, reversal, and omega turn for LC and HC configurations. Being capable of stimulating or inhibiting worm neurons and simultaneously measuring the thrust force, this enabling platform would offer new insights into the correlation between neurons and locomotive behaviors of the nematode under a complex environment.  相似文献   

Verstehende Motorik?!     

Volker Schürmann 《Sportwissenschaft》2017,47(1):42-50

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List of Reviewers 2006     

Iven Schad  Regina Roessler  Andreas Neef  Anne Valle Zárate  Volker Hoffmann 《The Journal of Agricultural Education and Extension》2013,19(1):85-87

ASCTRACT

This study aims to analyze the potential and constraints of group-based extension approaches as an institutional innovation in the Vietnamese agricultural extension system. Our analysis therefore unfolds around the challenges of how to foster this kind of approach within the hierarchical extension policy setting and how to effectively shape and enable learning groups. The analysis draws on qualitative data from case studies of five newly established extension groups in Son La province, collected between 2007 and 2008. Content analysis was applied as the main analytical tool. The basic principles of group-based learning approaches are still underdeveloped, mainly due to a non-supportive institutional environment and a command-and-follow mentality. Extension groups suffer from an insufficient distinction between social processes and technical procedures. Finding an appropriate balance between enhancing leadership and supporting collective responsibility is identified as key to sustain groups. The research identified room for adjustments in group-organizational issues since the external institutional environment is hard to change. The particular value of this paper lies in addressing how to organize group-extension approaches in the context of reformed extension systems in a transitional socialist setting.  相似文献   

Total kinetic energy production of body segments is different between racing and training paces in elite Olympic rowers     

Daniel J. Bechard  Volker Nolte  Angela E. Kedgley 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(3):199-211

Total kinetic energy (TKE) was calculated for 28 Canadian national team Olympic rowers during training on water, comparing low-stroke rates (18–22 stroke/min) and high-stroke rates (32–40 stroke/min), using video analysis. Stroke duration was normalized to 100%, beginning and ending at the “catches”, with the drive phase occurring first and recovery second. Two discrete points were identified during the stroke, both occurring when the fingers had the same horizontal position as the ankles (i.e. mid-drive and mid-recovery). The ratios of recovery-to-drive TKE at these points for the entire body at low and high-stroke rates were 0.36 ± 0.34 and 1.26 ± 0.54 respectively. Significant differences were found for the lower leg, upper arm and forearm segments, and within the female groups. Low-stroke rate is a typical training pace and high-stroke rate is analogous to a race pace. This study demonstrates that TKE production during recovery in a race was not replicated during training. While training at low-stroke rates is vital for technique refinement, this study stresses the importance of training appropriately for the energy expenditure during high-stroke rate recovery. This is commonly overlooked by coaches and athletes.  相似文献   

The Museum Experience: Mapping the Experience of Fine Art     

Volker Kirchberg  Martin Trndle 《Curator: The Museum Journal》2015,58(2):169-193

How do visitors to fine art museums experience exhibitions? Can we classify their experiences? What are the factors that drive different types of visitor experience? We set out to answer these questions by analyzing from sociological, psychological, physiological, and behavioral perspectives the responses of 576 visitors to a special exhibition 11: 1 (+ 3) = Eleven Collections for One Museum mounted at the Kunstmuseum St. Gallen, Switzerland, from June to August 2009. Our five‐year research project, eMotion: Mapping the Museum Experience, interpreted computer‐modeled movement‐tracking and physiological maps of the visitors in complement with entrance and exit surveys. We tested individual aspects of the visitor, such as her or his expectations of the exhibition prior to seeing it; his or her socio‐demographic characteristics; her or his affinity for art, mood just before and receptivity just after the visit; and spatial, individual, and group‐related behavior patterns. Our study breaks down three types of exhibition experience that we call “the contemplative,” “the enthusing,” and “the social experience.” The results yield new information about aesthetic arousal, cognitive reaction, patterns of social behavior, and the diverse elements of the exhibition experience.  相似文献   

America and the Intellectual Cold Wars in Europe     

Berghahn  Volker R. 《Minerva》2005,43(1):103-107

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Das große Lexikon der DDR-Sportler     

Volker Kluge  Andreas Höfer 《Sportwissenschaft》2002,32(3):344-348

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Introduction to the Special Issue: Using Inquiry-Based Learning in Mathematics for Liberal Arts Courses     

Philip K. Hotchkiss  Volker Ecke  Julian F. Fleron  Christine von Renesse 《PRIMUS》2015,25(3):193-197

Abstract

Mathematics for liberal arts courses are a staple of most mathematics departments and are often populated with students who have disengaged from mathematics. Inquiry-based learning is a student-centered pedagogical tool for re-engaging students in mathematics. In this paper, we introduce a Special Issue of PRIMUS on “Using Inquiry-Based Learning in Mathematics for Liberal Arts Courses.”  相似文献   

Response Privacy and Elapsed Time Since Election Day as Determinants for Vote Overreporting     

Stocke  Volker 《Int. Journal of Public Opinion Research》2007,19(2):237-246

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