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Search Results: 1 - 10 of 203599 matches for " Nathan P. Krug "
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Growth of an Out-of-Class Learning Community through Autonomous Socialization at a Self-Access Centre
Leander S. Hughes,Nathan P. Krug,Stacey Vye
Studies in Self-Access Learning Journal , 2011,
Abstract: This study investigates the benefits of attending the Saitama University English Resource Center (ERC), a self-access center for English language learning open to all students at the university and managed by full-time faculty who alternate as center advisors. The study builds on previous research to explore how advisors promote language learning through facilitating autonomous socialization in the L2 among center attendees. This authentic social interaction not only exposes learners to patterns of discourse and other language input unavailable to learners in most institutional settings, it has also served as the means through which visiting students have formed an out-of-class learning community that now extends well beyond the center’s walls. Findings of a significant increase in center attendees and meaningful gains in the number of frequent attendees over the past year provide evidence that supports informal observations of the growth of this extraordinary L2-based community.
Advising Practices: A Survey of Self-Access Learner Motivations and Preferences
Leander S. Hughes, Nathan P. Krug, and Stacey L. Vye
Studies in Self-Access Learning Journal , 2012,
Abstract: Based on queries from students who frequently visit the English Resource Center (ERC) at Saitama University, this research team set out to examine what motivational factors encourage ERC attendees to participate for an extended period of time in the Center on a regular basis. Initial indications are that social collaborative learning amongst peers at the Center is the most significant long-term motivational factor for students to become involved with learning English in the ERC. More specifically, this study explores factors that encourage these learners to become regular and perhaps more autonomous center participants in terms of advising practices such as (a) what factors led students to their initial discovery of ERC, (b) what inspired that very first visit, (c) what encouraged learners to continue to attend the Center on a regular basis, (d) what attendees value about the ERC, and finally (e) what might be done to ensure that greater support is provided for students who come to the ERC for the first time.
Use of Eye Movement Tracking in the Differential Diagnosis of Attention Deficit Hyperactivity Disorder (ADHD) and Reading Disability  [PDF]
Pamela Deans, Liz O’Laughlin, Brad Brubaker, Nathan Gay, Damon Krug
Psychology (PSYCH) , 2010, DOI: 10.4236/psych.2010.14032
Abstract: The present study examined the clinical utility of eye movement tracking in the differential diagnosis of Attention Deficit/Hyperactivity Disorder (ADHD) and Reading Disorder (RD). It was anticipated that eye movement tracking would provide a better understanding of the underlying deficits that potentially contribute to reading difficulties among children with ADHD and RD. Participants included 27 children diagnosed with ADHD, 20 that met criteria for a reading disorder and 30 Control children with no clinical diagnosis. All participants were between the ages of 6 to 12. Consistent with previous research, children in the RD group displayed slower reading time, longer fixation duration and more atypical eye movements as compared to Control children. Children with ADHD also displayed more atypical eye movement as compared to Control children. The only significant difference between the ADHD and RD groups was in total reading time. Results of a discriminant analysis revealed that less than 60% of participants were given the correct diagnostic classification based on total reading time and proportion of left to right saccades indicating limited support for this measure in diagnosis of ADHD versus RD.
Second layer nucleation and the shape of wedding cakes
J. Krug,P. Kuhn
Physics , 2001,
Abstract: The rate of second layer nucleation -- the formation of a stable nucleus on top of a two-dimensional island -- determines both the conditions for layer-by-layer growth, and the size of the top terrace of multilayer mounds in three-dimensional homoepitaxial growth. It was recently shown that conventional mean field nucleation theory overestimates the rate of second layer nucleation by a factor that is proportional to the number of times a given site is visited by an adatom during its residence time on the island. In the presence of strong step edge barriers this factor can be large, leading to a substantial error in previous attempts to experimentally determine barrier energies from the onset of second layer nucleation. In the first part of the paper simple analytic estimates of second layer nucleation rates based on a comparison of the relevant time scales will be reviewed. In the main part the theory of second layer nucleation is applied to the growth of multilayer mounds in the presence of strong but finite step edge barriers. The shape of the mounds is obtained by numerical integration of the deterministic evolution of island boundaries, supplemented by a rule for nucleation in the top layer. For thick films the shape converges to a simple scaling solution. The scaling function is parametrized by the coverage $\theta_c$ of the top layer, and takes the form of an inverse error function cut off at $\theta_c$. The surface width of a film of thickness $d$ is $\sqrt{(1- \theta_c) d}$. Finally, we show that the scaling solution can be derived also from a continuum growth equation.
Melhoramento da mamoneira(Ricinus communis L.) II: observa??es gerais sobre a variabilidade do gênero Ricinus
Krug, C. A.;Mendes, P. Teixeira;
Bragantia , 1942, DOI: 10.1590/S0006-87051942000500002
Abstract: ninety six varieties of ricinus communis, l. were studied as for their growth habit, height, length and number of internodes from the base of the plant to its first inflorescence, types of branching, color of branches and various characters of leaves, inflorescences, fruit clusters, fruits and seeds ; earliness ; yielding capacity and porcentage of oil in the seeds. the description of several of the quantitative characters is supplemented by numerical data, which are also presented graphically. the extreme variability of ricinus offers excellent opportunities not only for genetical studies but also for breeding new and better varieties for cultivation.
Melhoramento do milho: II - Germoplasma utilizado nos trabalhos de sele??o
Viegas, G. P.;Krug, C. A.;
Bragantia , 1952, DOI: 10.1590/S0006-87051952000300002
Abstract: in order to diversify the maize germplasm utilized in the breeding work conducted at the instituto agron?mico, at campinas, s?o paulo, brazil, efforts were made to obtain corn samples from the most diversified origins. seeds of numerous varieties, inbred lines and hybrids were introduced and their performance observed under local conditions. until 1951, a total of 1405 samples were introduced, most of them being derived from various parts of brazil. from the united states, colombia, peru, bolivia also numerous samples were obtained. recently, single crosses from colombia, and mexican inbred lines crossed to brazilian single hybrids, were introduced, and are being tested under local conditions. yellow flint and dent varieties were tested in trials conducted at campinas, ribeir?o preto and pindorama. the best ones were : 1-catêto, 333-creóle yellow flint and 417-assis brasil among the yellow flint and 373-itaici and 986-tuxpan, among the yellow dent varieties. plants from more than 50 distinct varieties were selfed to get inbred lines. lines from about 20 varieties are still available. most of these were derived from catêto, some having now been selfed for 20 generations. l. 483 is the most outstanding one, as it has excelent agronomic features and high combining ability. from tuxpan the line l. 94-956 was obtained in vi?osa, minas gerais. in the years 1941 and 1942, 153 inbred lines and many hybrids were introduced from the united states. their performance is not satisfactory under local conditions, as they are too early, the ears having poor husk protection.
Melhoramento da mamoneira (Ricinus communis L.) I: plano geral dos trabalhos em execu??o nas sec??es de genética e plantas oleaginosas do instituto agron?mico do estado de S?o Paulo
Krug, C. A.;Mendes, P. Teixeira;
Bragantia , 1942, DOI: 10.1590/S0006-87051942000500001
Abstract: in the introduction to this article data are presented to show the growing economic importance of the cultivation of ricinus in brasil and particularly in the state of s?o paulo. following general statements regarding the botany, the origin and the geographic distribution of this genus, the investigations are outlined which are carried out by the divisions of genetics and oil plants of the instituto agron?mico of the state of s?o paulo, brasil, to improve this important crop plant. summarising, these investigations deal with the following subjects : a) organisation of a large collection of types ; b) investigations concerning the variability of the genus ricinus c) genetic analysis; d) regional variety trials ; e) improvement of the best varieties by individual selection and progeny trials ; f) regional strain tests ; g) breeding of improved varieties through hybridisation. in spite of the fact that these investigations have only been carried out for a few years, they are already furnishing results of economic importance, as seeds of superior varieties are already on sale to the farmers.
A novel quasi-peak-detector for time-domain EMI-measurements
F. Krug,S. Braun,P. Russer
Advances in Radio Science : Kleinheubacher Berichte , 2004,
Abstract: In this paper, an advanced ultra-fast, broadband time domain EMI measurement system is described. Measurements were performed in the 30–1000MHz range. The digital signal processing of EMI measurements allows to emulate in real-time the modes of conventional analogous equipment, e.g. Peak-, Average-, RMS- and Quasi-Peak- Detector. With the presented time domain measurement system the measurement time can be reduced by a factor of 10. A novel signal recording routine for time-domain EMI (TDEMI) measurements and Quasi-Peak-Detection is described. Measurement results obtained from the investigation of a drillmachine, monitor and laptop obtained with the timedomain electromagnetic interference (TDEMI) measurement system are discussed. The results obtained with the described system have been compared with measurements performed with a conventional EMI receiver.
Risks identied in implementation of district clinical specialist teams
R Nathan, P Rautenbach
South African Medical Journal , 2013,
Abstract: The District Clinical Specialist Team (DCST) is a strategy implemented by the South African National Department of Health to strengthen district health systems. An amount of R396 million per annum will be required to fund posts in all 52 districts. During implementation, numerous risks were identified, the major one being the most expensive category of DCST personnel, i.e. Head of Clinical Unit. Similar risks will probably apply to other categories of personnel within the DCST. To achieve the objectives of the DCST strategy, risk reduction strategies need to be promptly applied.
Revisiting the Estimation of Dinosaur Growth Rates
Nathan P. Myhrvold
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0081917
Abstract: Previous growth-rate studies covering 14 dinosaur taxa, as represented by 31 data sets, are critically examined and reanalyzed by using improved statistical techniques. The examination reveals that some previously reported results cannot be replicated by using the methods originally reported; results from new methods are in many cases different, in both the quantitative rates and the qualitative nature of the growth, from results in the prior literature. Asymptotic growth curves, which have been hypothesized to be ubiquitous, are shown to provide best fits for only four of the 14 taxa. Possible reasons for non-asymptotic growth patterns are discussed; they include systematic errors in the age-estimation process and, more likely, a bias toward younger ages among the specimens analyzed. Analysis of the data sets finds that only three taxa include specimens that could be considered skeletally mature (i.e., having attained 90% of maximum body size predicted by asymptotic curve fits), and eleven taxa are quite immature, with the largest specimen having attained less than 62% of predicted asymptotic size. The three taxa that include skeletally mature specimens are included in the four taxa that are best fit by asymptotic curves. The totality of results presented here suggests that previous estimates of both maximum dinosaur growth rates and maximum dinosaur sizes have little statistical support. Suggestions for future research are presented.
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