Can districts keep good teachers in the schools that need them most?

This study investigates how school demographics and their interactions with policies affect the mobility behaviors of public school teachers with various human capital characteristics. Using data from North Carolina from 1995 to 2006, it finds that teachers’ career stage and human capital investments dominate their decisions to leave public school teaching and school demographic characteristics play a dominant role in intra-system sorting. Schools serving at-risk children struggle to attract and retain teachers with desirable observable characteristics. We find evidence to suggest that across-the-board school-based pay-for-performance policies have small but significant associations with mobility decisions and appear to exacerbate inequities in the distribution of teacher qualifications.     

Cognitive Load Theory as a Tool for Expertise Development

This special issue is dedicated to recentdevelopments within cognitive load theory (CLT)and identifies some instructional implicationsof the interaction between informationstructures and cognitive architecture. Thepresent article discusses the different studiesin this special issue. An important conclusionis that recent CLT research recognizes thelearners' level of expertise as an importantfactor mediating the relation between cognitivearchitecture, information structures, andlearning outcomes. In this context, we discussthe role of expertise in CLT research and therole of CLT in expertise research. Based onthis discussion, the use of CLT as a tool todevelop expertise is identified as a verypromising approach.     

Modelling impact of dredging and dumping in ebb-flood channel systems

For a channel-shoal system in a funnel-shaped basin the impact of dredging and dumping is investigated using a complex process-based model. First, the residual flow and sediment transport circulations are analysed for the channel-shoal pattern, which has emerged after a long-term model simulation. Results are compared to the Western Scheldt estuary, which forms the inspiration for this study. Subsequently, different dredge and dump scenarios are modelled, according to a conceptual model, in which ebb-and flood-channels and enclosed shoals form morphodynamic units (cells) with their own sediment circulation. Model results show that dumping sediment in a channel further reduces the channel depth and induces erosion in the opposite channel, which enhances tilting of the cross-section of the cell and eventually can lead to the degeneration of a multiple channel system into a single channel. The impact of different dredging and dumping cases agrees with results from a stability analysis. This means that this type of model applied to a realistic geometry can potentially be used for better prediction of the impact of human interventions.     

Relationship between laboratory-measured variables and heart rate during an ultra-endurance triathlon

The aim of the present study was to examine the relationship between the performance heart rate during an ultra-endurance triathlon and the heart rate corresponding to several demarcation points measured during laboratory-based progressive cycle ergometry and treadmill running. Less than one month before an ultra-endurance triathlon, 21 well-trained ultra-endurance triathletes (mean +/- s: age 35 +/- 6 years, height 1.77 +/- 0.05 m, mass 74.0 +/- 6.9 kg, = 4.75 +/- 0.42 l x min(-1)) performed progressive exercise tests of cycle ergometry and treadmill running for the determination of peak oxygen uptake (VO2peak), heart rate corresponding to the first and second ventilatory thresholds, as well as the heart rate deflection point. Portable telemetry units recorded heart rate at 60 s increments throughout the ultra-endurance triathlon. Heart rate during the cycle and run phases of the ultra-endurance triathlon (148 +/- 9 and 143 +/- 13 beats x min(-1) respectively) were significantly (P < 0.05) less than the second ventilatory thresholds (160 +/- 13 and 165 +/- 14 beats x min(-1) respectively) and heart rate deflection points (170 +/- 13 and 179 +/- 9 beats x min(-1) respectively). However, mean heart rate during the cycle and run phases of the ultra-endurance triathlon were significantly related to (r = 0.76 and 0.66; P < 0.01), and not significantly different from, the first ventilatory thresholds (146 +/- 12 and 148 +/- 15 beats x min(-1) respectively). Furthermore, the difference between heart rate during the cycle phase of the ultra-endurance triathlon and heart rate at the first ventilatory threshold was related to marathon run time (r = 0.61; P < 0.01) and overall ultra-endurance triathlon time (r = 0.45; P < 0.05). The results suggest that triathletes perform the cycle and run phases of the ultra-endurance triathlon at an exercise intensity near their first ventilatory threshold.     

Providing Dental Current Awareness to Faculty and Residents

Providing a current awareness service to patrons has long been a concern of many health sciences librarians. Dental librarians have a unique challenge in providing current awareness to patrons as the literature has not always been available in a timely manner through traditional systems. This article will discuss the evolution of current awareness systems, the issues facing dental librarians with regard to providing dental current awareness, and how the Wilson Dental Library addressed those issues.     

Public Libraries,Political Speech,and the Possibility of a Commons

Public libraries are not only political institutions, they are enmeshed in the politics of society. This paper presents some of the more thoughtful conceptions of both conservative and liberal politics, to a specific end. That end is the suggestion that public libraries can act as commons within their communities. The intricacies of acting as commons are detailed here, along with some practical suggestions for realizing the goal of becoming a commons.     

Breaching ethics for the sake of a “good” interview

This essay presents a series of short stories – autoethnographic tales from the field – about my experiences as a female (qualitative) researcher studying humor in male-dominated workplaces in 2014. I conducted over thirty ethnographic interviews with professional hair stylists and barbers throughout Phoenix, Arizona and Sacramento, California to better understand the discursive processes by which humor is gendered in non-corporate organizations. While in the field, however, I encountered more than I bargained for. The study participants (male and female) openly engaged in humorous dialogue including: verbal critiques of my body/sexuality, sexual harassment, suggestive innuendos, physical touch, and outright heterosexist humor. After reflecting on my experiences, I realized how institutional resources (e.g. Institutional Review Board) and protocols function to protect research participants yet do little to ensure the safety, security, and/or comfort of researchers.