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Search Results: 1 - 10 of 168712 matches for " Laurel E. Winter "
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Superconducting phase diagram and FFLO signature in $λ$-(BETS)$_2$GaCl$_4$ from rf penetration depth measurements
William A. Coniglio,Laurel E. Winter,Kyuil Cho,C. C. Agosta,B. Fravel,L. K. Montgomery
Physics , 2010, DOI: 10.1103/PhysRevB.83.224507
Abstract: We report the phase diagram of $\lambda$-(BETS)$_2$GaCl$_4$ from rf penetration depth measurements with a tunnel diode oscillator in a pulsed magnetic field. We examined four samples with 1100 field sweeps in a range of angles with the magnetic field parallel and perpendicular to the conducting planes. In the parallel direction, $H_{c2}$ appears to include a tricritical point at 1.6 K and 10 T with a phase line that increases to 11 T as the temperature is decreased to} 500 mK. The second phase line forms a clearly defined high field low temperature region satisfying several of the conditions of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. We show remarkably good fits of $H_{c2}$ to WHH in the reentrant $\alpha>1$, $\lambda_{so}=0$ regime. We also note a sharp angle dependence of the phase diagram about the field parallel orientation that characterizes Pauli paramagnetic limiting and further supports the possibility of FFLO behavior. Unrelated to the FFLO study, at fields and temperatures below $H_{c2}$ and $T_c$, we find rich structure in the penetration depth data that we attribute to impurities at the surface altering the superconducting properties while maintaining the same crystallographic axes as $H_{c2}$.
Improvements to the Tunnel Diode Oscillator technique for high frequencies and pulsed magnetic fields with digital acquisition
William A. Coniglio,Laurel E. Winter,Chris Rea,Kyuil Cho,C. C. Agosta
Physics , 2010,
Abstract: We discuss improvements to the short-term performance of tunnel diode oscillator transducers with an emphasis on frequencies from 30 MHz to 1.2 GHz using LC type tank circuits. We specifically consider the TDO in pulsed high magnetic fields with fast digital acquisition. Since overdriven oscillators are necessary in pulsed fields to maintain oscillations, we examine the circuit using SPICE simulation during the design process and to gain insight into its behavior. We also discuss a numerical technique for demodulating the oscillations into frequency and amplitude.
Recent Results from the study of QCD and Jets at HERA
Laurel E. Sinclair
Physics , 1997,
Abstract: The HERA experiments H1 and ZEUS have recently presented a number of interesting results from studies of the hadronic final state produced in $ep$ collisions. These studies have focussed on deep inelastic scattering events and on the photoproduction of jets, and also on the comparison of the final states produced in these two regimes. Some of these results are reviewed here.
Sequencing the Cortical Processing of Pitch-Evoking Stimuli using EEG Analysis and Source Estimation
Blake E. Butler,Laurel J. Trainor
Frontiers in Psychology , 2012, DOI: 10.3389/fpsyg.2012.00180
Abstract: Cues to pitch include spectral cues that arise from tonotopic organization and temporal cues that arise from firing patterns of auditory neurons. fMRI studies suggest a common pitch center is located just beyond primary auditory cortex along the lateral aspect of Heschl’s gyrus, but little work has examined the stages of processing for the integration of pitch cues. Using electroencephalography, we recorded cortical responses to high-pass filtered iterated rippled noise (IRN) and high-pass filtered complex harmonic stimuli, which differ in temporal and spectral content. The two stimulus types were matched for pitch saliency, and a mismatch negativity (MMN) response was elicited by infrequent pitch changes. The P1 and N1 components of event-related potentials (ERPs) are thought to arise from primary and secondary auditory areas, respectively, and to result from simple feature extraction. MMN is generated in secondary auditory cortex and is thought to act on feature-integrated auditory objects. We found that peak latencies of both P1 and N1 occur later in response to IRN stimuli than to complex harmonic stimuli, but found no latency differences between stimulus types for MMN. The location of each ERP component was estimated based on iterative fitting of regional sources in the auditory cortices. The sources of both the P1 and N1 components elicited by IRN stimuli were located dorsal to those elicited by complex harmonic stimuli, whereas no differences were observed for MMN sources across stimuli. Furthermore, the MMN component was located between the P1 and N1 components, consistent with fMRI studies indicating a common pitch region in lateral Heschl’s gyrus. These results suggest that while the spectral and temporal processing of different pitch-evoking stimuli involves different cortical areas during early processing, by the time the object-related MMN response is formed, these cues have been integrated into a common representation of pitch.
Using Yoga to Reduce Stress and Bullying Behaviors among Urban Youth  [PDF]
Erin E. Centeio, Laurel Whalen, Erica Thomas, Noel Kulik, Nate McCaughtry
Health (Health) , 2017, DOI: 10.4236/health.2017.93029
Abstract: Background/Purpose: Obesity and secondary conditions continue to disproportionally affect the health of children living in urban areas. Studies show that a lack of resources and physical activity-unfriendly communities discourage 60 minutes of daily activity, including strengthening exercises, as recommended by the Centers for Disease Control and Prevention. Using Social Ecological theory, the purpose of this study was to examine the multi-level influences of a yoga-based intervention on urban, inner city youth. Method: Using a mixed-methods design, ninety-three 3 - 5th grade students at five urban elementary schools participated in a ten-week yoga intervention. Analysis/Results: RM-ANOVA results revealed a significant reduction in stress and bullying behaviors among participants, and multiple regression analyses revealed that program attendance, change in stress, and change in yoga enjoyment significantly predicted change in yoga participation outside PE, when controlling for gender and age F(5, 87) = 5.36, p < 0.01, adj. R2 = 0.19, but did not have a significant impact on physical activity participation outside of school. Student interviews and non-participant observations revealed strong enjoyment of yoga which led students to report substantial increases in yoga-related activities outside of school. Students also revealed that experience in yoga improved focus, attention, and reduced stress. Conclusions: Through convergence of qualitative and quantitative methods, this study showed a positive relationship between the number of yoga sessions attended (dose), enjoyment of yoga, and participation in yoga outside PE with friends and family. Findings suggest that urban PE should include more individual, non-competitive activities such as yoga, which students find to be stress-relieving, fun, inexpensive and easy to perform at home.
Screening for Somatoform Disorders in Children and Adolescents  [PDF]
S. Winter, C. Quinn, K. Lenz, E. Pfeiffer, U. Lehmkuhl
Psychology (PSYCH) , 2014, DOI: 10.4236/psych.2014.514173
Abstract: Until now, no German diagnostic instrument existed for somatoform disorders in children and adolescents. Therefore the Screening for Somatoform Disorders in Children and Adolescents (SOMS-CA) was developed based on the SOMS-2 (Screening for Somatoform Disorders 2) (Rief & Hiller, 2008). This study investigates to what extent the SOMS-CA can differentiate significantly between children and adolescents with clinically diagnosed somatoform disorders and a control group and whether the SOMS-CA is superior to the GSCL-C (Giessen Subjective Complaint List for Children) (Braehler, 1992). 30 patients (11 - 17 years) with somatoform disorders and a control group (n = 31) were examined with the SOMS-CA (N = 61). The results from the SOMS-CA in both groups were compared with one another by means of a contingency analysis (chi-square test). The sensitivity and specificity were calculated and an optimal cut-off value was determined (Receiver Operating Characteristic curve (ROC-curve) analysis). A comparison analysis of the ROC-curves of the SOMS-CA and the GSCL-C followed. The sum score of complaints in the patients was significantly higher than that in the control group. The ROC-curve for the SOMS-CA demonstrates its excellent ability to differentiate between the two groups with an AUC (area under the curve) = 0.983 (SE = 0.14; N = 61). The sensitivity was 97.6%, the specificity 96.8%. In comparison to the AUC of the GSCL-C the SOMS-CA shows a much higher result. The SOMS-CA successfully identifies patients with somatoform disorders from a paediatric population and differentiates from healthy test subjects. A comparison to the GSCL-C shows a considerable superiority of the SOMS-CA. Further studies on the validity of the SOMS-CA are necessary.
Statistical software applications used in health services research: analysis of published studies in the U.S
Allard E Dembe, Jamie S Partridge, Laurel C Geist
BMC Health Services Research , 2011, DOI: 10.1186/1472-6963-11-252
Abstract: Data were extracted from a sample of 1,139 articles (including 877 original research articles) published between 2007 and 2009 in three U.S. HSR journals, that were considered to be representative of the field based upon a set of selection criteria. Descriptive analyses were conducted to categorize patterns in statistical software usage in those articles. The data were stratified by calendar year to detect trends in software use over time.Only 61.0% of original research articles in prominent U.S. HSR journals identified the particular type of statistical software application used for data analysis. Stata and SAS were overwhelmingly the most commonly used software applications employed (in 46.0% and 42.6% of articles respectively). However, SAS use grew considerably during the study period compared to other applications. Stratification of the data revealed that the type of statistical software used varied considerably by whether authors were from the U.S. or from other countries.The findings highlight a need for HSR investigators to identify more consistently the specific analytical software used in their studies. Knowing that information can be important, because different software packages might produce varying results, owing to differences in the software's underlying estimation methods.Health services research (HSR) is a highly interdisciplinary field that employs a variety of quantitative and qualitative methods. While many statistical software applications are available to health services researchers, there is no accepted norm in the profession regarding which software product to use for HSR studies. To the best of our knowledge, there is no publicly available software that has been designed specifically for use in HSR studies (although some applications, such as MedCalc, are designed primarily for biomedical analyses). Rather, researchers are free to choose whatever software program is deemed to be most appropriate for use in a particular study, given the stud
Australian Newspaper Blogs
Laurel E Dyson,Alan Sixsmith,Thien Kim Than
Communications of the IBIMA , 2008,
Abstract: Blogs have become one of the most prominent forms of social media on the Web. This paper reports on the first part of a comprehensive study of how a mainstream Australian media organisation is integrating blogs into their business. The research used a qualitative approach and data collection was undertaken using semi-structured interviews with newspaper staff. The findings presented provide an insight into the opportunities to be gained and the challenges to be faced by Australian media organisations as they incorporate blogs in their online offerings.
Preface
Laurel Littrell
Kansas Library Association College and University Libraries Section Proceedings , 2012, DOI: 10.4148/culs.v1i0.1607
Abstract: ;An introduction to the second annual KLA-CULS Proceedings.
Juan Manuel Echavarría
Laurel Reuter
Revista Colombiana de Psiquiatría , 2010,
Abstract:
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