2,425 research outputs found
Spectral line shape modeling and ion temperature fluctuations in tokamak edge plasmas
In this work, we use a passive advection model for ion temperature
fluctuations, in order to investigate their effects on Doppler Spectral line
shapes. The relevance of the model is discussed in the framework of the
Braginskii equations, and the subsequent Probability Density Function
evaluation relies on results obtained in neutral fluids. The resulting Doppler
line profiles are shown to exhibit characteristic exponential tails.Comment: 6 pages, 2 figures, to be published in Contributions to Plasma
Physic
With development, list recall includes more chunks, not just larger ones.
The nature of the childhood development of immediate recall has been difficult to determine. There could be a developmental increase in either the number of chunks held in working memory or the use of grouping to make the most of a constant capacity. In 3 experiments with children in the early elementary school years and adults, we show that improvements in the immediate recall of word and picture lists come partly from increases in the number of chunks of items retained in memory. This finding was based on a distinction between access to a studied group of items (i.e., recall of at least 1 item from the group) and completion of the accessed group (i.e., the proportion of the items recalled from the group). Access rates increased with age, even with statistical controls for completion rates, implicating development of capacity in chunks. (PsycINFO Database Record (c) 2010 APA, all rights reserved
Taking Informed Action in Challenging Times: Helping Community Foundations during Economic Downturn
Following up on CF Insights' November 2008 report "Making Informed Decisions in Uncertain Times", this report is aimed at helping community foundations take informed action in relation to their operating models and community activities in reaction to the economic slump. The findings are based on quantitative and qualitative research conducted with 95 community foundations during the spring of 2009. The research findings overall underscore that the field has been able to "make lemonade" from the crisis. In light of tepid expectations for assets and gifts for the rest of 2009, community foundations are being creative and thoughtful in how they allocate precious resources andstep up their community leadership.
Maximum Recommended Dosage of Lithium for Pregnant Women Based on a PBPK Model for Lithium Absorption
Treatment of bipolar disorder with lithium therapy during pregnancy is a medical challenge. Bipolar disorder is more prevalent in women and its onset is often concurrent with peak reproductive age. Treatment typically involves administration of the element lithium, which has been classified as a class D drug (legal to use during pregnancy, but may cause birth defects) and is one of only thirty known teratogenic drugs. There is no clear recommendation in the literature on the maximum acceptable dosage regimen for pregnant, bipolar women. We recommend a maximum dosage regimen based on a physiologically based pharmacokinetic (PBPK) model. The model simulates the concentration of lithium in the organs and tissues of a pregnant woman and her fetus. First, we modeled time-dependent lithium concentration profiles resulting from lithium therapy known to have caused birth defects. Next, we identified maximum and average fetal lithium concentrations during treatment. Then, we developed a lithium therapy regimen to maximize the concentration of lithium in the mother's brain, while maintaining the fetal concentration low enough to reduce the risk of birth defects. This maximum dosage regimen suggested by the model was 400 mg lithium three times per day
Funk What You Heard: Hip Hop Is a Field of Study
“Funk What You Heard” is a beaconing call to all scholars who engage with Hip Hop studies. This article lays out the ways in which Hip Hop studies should properly respond to the wave of oppressions currently pounding the world. With several key date markers in place for Hip Hop studies, Tricia Rose’s Black Noise in 1994 and Murray Foreman and Mark Anthony Neal’s That’s the Joint in 2004, “Funk What You Heard” charts the path forward for the future of Hip Hop studies. Black Noise provided the original blueprint for studying Hip Hop and That’s the Joint! stamped “hip-hop studies” into history. Although we are close to thirty years since Black Noise, lyrical analysis is a dominant method for Hip Hop studies. Also, although we have a clearly identifiable field, academics still treat Hip Hop as an interesting topic they can write about without speaking to the field. “Funk What You Heard” calls for something more. We can no longer continue down this path of weak analysis and rewriting Hip Hop theories that have been discussed time and time again. Our contemporary waves of oppression have raised the stakes. With the path charted out, we ultimately call on Hip Hop scholars to answer their ancestral call. Answering this call pragmatically looks like building on the field, developing new and innovative research methods, and engaging with all the elements of Hip Hop. As far as the unseen, we will leave that up to your reflection with Hip Hop’s collective consciousness that is not bound by space and time
- …