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Search Results: 1 - 10 of 147030 matches for " Jon B. Betts "
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Bounding the pseudogap with a line of phase transitions in YBCO cuprate superconductors
Arkady Shekhter,B. J. Ramshaw,Ruixing Liang,W. N. Hardy,D. A. Bonn,Fedor F. Balakirev,Ross D. McDonald,Jon B. Betts,Scott C. Riggs,Albert Migliori
Physics , 2012, DOI: 10.1038/nature12165
Abstract: Close to optimal doping, the copper oxide superconductors show 'strange metal' behavior, suggestive of strong fluctuations associated with a quantum critical point. Such a critical point requires a line of classical phase transitions terminating at zero temperature near optimal doping inside the superconducting 'dome'. The underdoped region of the temperature-doping phase diagram from which superconductivity emerges is referred to as the 'pseudogap' because evidence exists for partial gapping of the conduction electrons, but so far there is no compelling thermodynamic evidence as to whether the pseudogap is a distinct phase or a continuous evolution of physical properties on cooling. Here we report that the pseudogap in YBCO cuprate superconductors is a distinct phase, bounded by a line of phase transitions. The doping dependence of this line is such that it terminates at zero temperature inside the superconducting dome. From this we conclude that quantum criticality drives the strange metallic behavior and therefore superconductivity in the cuprates.
Brain Networks Supporting Execution of Mathematical Skills versus Acquisition of New Mathematical Competence
Samuel Wintermute, Shawn Betts, Jennifer L. Ferris, Jon M. Fincham, John R. Anderson
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0050154
Abstract: This fMRI study examines how students extend their mathematical competence. Students solved a set of algebra-like problems. These problems included Regular Problems that have a known solution technique and Exception Problems that but did not have a known technique. Two distinct networks of activity were uncovered. There was a Cognitive Network that was mainly active during the solution of problems and showed little difference between Regular Problems and Exception Problems. There was also a Metacognitive Network that was more engaged during a reflection period after the solution and was much more engaged for Exception Problems than Regular Problems. The Cognitive Network overlaps with prefrontal and parietal regions identified in the ACT-R theory of algebra problem solving and regions identified in the triple-code theory as involved in basic mathematical cognition. The Metacognitive Network included angular gyrus, middle temporal gyrus, and anterior prefrontal regions. This network is mainly engaged by the need to modify the solution procedure and not by the difficulty of the problem. Only the Metacognitive Network decreased with practice on the Exception Problems. Activity in the Cognitive Network during the solution of an Exception Problem predicted both success on that problem and future mastery. Activity in the angular gyrus and middle temporal gyrus during feedback on errors predicted future mastery.
Content Disputes in Wikipedia Reflect Geopolitical Instability
Gordana Apic, Matthew J. Betts, Robert B. Russell
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0020902
Abstract: Indicators that rank countries according socioeconomic measurements are important tools for regional development and political reform. Those currently in widespread use are sometimes criticized for a lack of reproducibility or the inability to compare values over time, necessitating simple, fast and systematic measures. Here, we applied the ‘guilt by association’ principle often used in biological networks to the information network within the online encyclopedia Wikipedia to create an indicator quantifying the degree to which pages linked to a country are disputed by contributors. The indicator correlates with metrics of governance, political or economic stability about as well as they correlate with each other, and though faster and simpler, it is remarkably stable over time despite constant changes in the underlying disputes. For some countries, changes over a four year period appear to correlate with world events related to conflicts or economic problems.
Ginsenoside-Rb1 Induces ARPE-19 Proliferation and Reduces VEGF Release
Brandi S. Betts,Kalpana Parvathaneni,Bharat B. Yendluri,Jeffery Grigsby
ISRN Ophthalmology , 2011, DOI: 10.5402/2011/184295
Substrate Utilization by the Failing Human Heart by Direct Quantification Using Arterio-Venous Blood Sampling
Junichi Funada,Tim R. Betts,Leanne Hodson,Sandy M. Humphreys,Jon Timperley,Keith N. Frayn,Fredrik Karpe
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0007533
Abstract: Metabolic substrate utilization of the human failing heart is an area of controversy. The purpose of this study is to directly quantify myocardial substrate utilization in moderately severe heart failure, type 2 diabetes and healthy controls using simultaneous coronary sinus and arterial blood sampling. Patients with heart failure (n = 9, mean NYHA 2.7±0.5), with type 2 diabetes (n = 5) and with normal heart function (n = 10) were studied after an overnight fast in connection with electrophysiological investigations/treatments.
Solving the Unbalanced Assignment Problem: Simpler Is Better  [PDF]
Nathan Betts, Francis J. Vasko
American Journal of Operations Research (AJOR) , 2016, DOI: 10.4236/ajor.2016.64028
Abstract: Recently, Yadaiah and Haragopal published in the American Journal of Operations Research a new approach to solving the unbalanced assignment problem. They also provide a numerical example which they solve with their approach and get a cost of 1550 which they claim is optimum. This approach might be of interest; however, their approach does not guarantee the optimal solution. In this short paper, we will show that solving this same example from the Yadaiah and Haragopal paper by using a simple textbook formulation to balance the problem and then solve it with the classic Hungarian method of Kuhn yields the true optimal solution with a cost of 1520.
The influence of vegetation on the ITCZ and South Asian monsoon in HadCM3
M. P. McCarthy, J. Sanjay, B. B. B. Booth, K. Krishna Kumar,R. A. Betts
Earth System Dynamics (ESD) & Discussions (ESDD) , 2012, DOI: 10.5194/esd-3-87-2012
Abstract: The role of global vegetation on the large-scale tropical circulation is examined in the version 3 Hadley Centre climate model (HadCM3). Alternative representations of global vegetation cover from observations and a dynamic global vegetation model (DGVM) were used as the land-cover component for a number of HadCM3 experiments under a nominal present day climate state, and compared to the simulations using the standard land cover map of HadCM3. The alternative vegetation covers result in a large scale cooling of the Northern Hemisphere extra-tropics relative to the HadCM3 standard, resulting in a southward shift in the location of the inter-tropical convergence zone (ITCZ). A significant reduction in Indian monsoon precipitation is also found, which is related to a weakening of the South Asian monsoon circulation, broadly consistent with documented mechanisms relating to temperature and snow perturbations in the Northern Hemisphere extra-tropics in winter and spring, delaying the onset of the monsoon. The role of the Northern Hemisphere extra-tropics on tropical climate is demonstrated, with an additional representation of vegetation cover based on DGVM simulated changes in Northern Hemisphere vegetation from the end of the 21st Century. This experiment shows that through similar processes the simulated extra-tropical vegetation changes in the future contribute to a strengthening of the South Asian monsoon in this model. These findings provide renewed motivation to give careful consideration to the role of global scale vegetation feedbacks when looking at climate change, and its impact on the tropical circulation and South Asian monsoon in the latest generation of Earth System models.
Biological and genetic information about the laboratory mouse
Matthew Betts
Genome Biology , 2000, DOI: 10.1186/gb-2000-1-1-reports218
Abstract: A wealth of resources related to the genetics and biology of the mouse can be accessed via this site. The two main components are the Mouse Genome Database (MGD) and the Genome Expression Database (GXD). The MGD contains information about genetic markers, molecular segments, phenotypes and mapping, and provides graphical displays of genetic, physical and cytogenetic maps. The GXD integrates available expression data. The data can be searched in many different ways, from simple searches of gene names to searches using phenotype class, polymorphisms and strains. Searches can be as specific as desired, which ensures their use for a wide variety of research purposes. There are also pages that explain and link to the origin of the data, that detail progression of the mouse genome sequencing project, and allow submission of data.All searches are directly accessible from the main page and from a simple menu button at the top of each page. There are many different ways of restricting each search by field type, all of which are linked to pages that explain their effects on the search results, giving a high level of control and predictability to the user. As all information can be accessed from several different starting points, it is easy to findThe site is updated daily.Searches can be controlled to a large degree, and there are explanations of how these search controls affect the results.The Trans-NIH mouse initiative site provides information on the Mouse Genomics and Genetics Resources Coordinating Group at NIH.Mouse genome informatics (MGI)Mouse genome informatics mirror sitesTrans-NIH mouse initiative
The official repository for human genome mapping data
Matthew Betts
Genome Biology , 2000, DOI: 10.1186/gb-2000-1-1-reports216
Abstract: The Genome Database (GDB) is the official central repository for mapping data from the International Human Genome Initiative. The data available are of three types: genomic segments (including genes, expressed sequence tags - ESTs and contigs); cytogenetic, contig, and other types of map; and polymorphism information. All these data are integrated and can be searched in a variety of ways, from chromosome location to protein name. Links to external resources, such as SWISS-PROT and the Mouse Genome Database at the Mouse genome informatics site, are provided where appropriate.Navigation is easy. The simplest general searches are available directly from the front page, and more detailed or specific searches have their own pages.The site is regularly updated when new data become available.This very comprehensive set of data is integrated well with external resources. The help pages are also very useful.Some of the displays require a Java-compatible browser, although the data can be viewed in a simpler format if preferred.The Genome sequence database and Mouse genome informatics.The Genome Database (GDB)Genome Database mirror sitesSWISS-PROTMouse genome informaticsGenome sequence database
Database of publicly available nucleotide sequences
Matthew Betts
Genome Biology , 2000, DOI: 10.1186/gb-2000-1-1-reports217
Abstract: Navigation was easy but it was sometimes unclear which of a variety of options was relevant to the problem in hand. The site may therefore require some getting used to but should prove useful with more experience.This site is updated daily.There are several methods for searching the database.The most powerful sequence retrieval and viewing tool on the site requires a Java plug-in program that appears to be available only for Windows 95/NT and Solaris (that is, not for the SGI that the site was reviewed on).A sequence viewer that runs on a wider variety of platforms would be useful.Nucleotide sequences are available from EMBL nucleotide sequence database database, GenBank and the DNA Databank of Japan.The Genome Sequence Database (GSDB)EMBL nucleotide sequence databaseGenBankDNA Databank of Japan
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