1,046 research outputs found
Testing Google Earth Engine for the automatic identification and vectorization of archaeological features: A case study from Faynan, Jordan
Supporting Practicing School Counselor’s Skill Development: A Hip Hop and Spoken Word Professional Development Intervention
Given the paucity of professional development (PD) opportunities, gaps in cultural competence, and deterioration of direct counseling service opportunities for many school counselors, it is reasonable to conjecture that there is an inadvertent abandonment of skill development and related student outcomes. This mixed-methods study sought to evaluate the effectiveness of an innovative PD series for school counselors, exploring participants\u27 self-efficacy in counseling skill use and cross-cultural competence. The researchers administered a multi-session PD to school counselors in an Urban, Northeast School District in the US. Data from pre- and post-training surveys, vignettes, and post-training focus groups indicated a significant decrease in participants’ self-efficacy pre- to post-training. Further, results suggest participants learned innovative practice, practiced humanistic counseling skills, and understood new potential for student growth
Wiki surveys: Open and quantifiable social data collection
In the social sciences, there is a longstanding tension between data
collection methods that facilitate quantification and those that are open to
unanticipated information. Advances in technology now enable new, hybrid
methods that combine some of the benefits of both approaches. Drawing
inspiration from online information aggregation systems like Wikipedia and from
traditional survey research, we propose a new class of research instruments
called wiki surveys. Just as Wikipedia evolves over time based on contributions
from participants, we envision an evolving survey driven by contributions from
respondents. We develop three general principles that underlie wiki surveys:
they should be greedy, collaborative, and adaptive. Building on these
principles, we develop methods for data collection and data analysis for one
type of wiki survey, a pairwise wiki survey. Using two proof-of-concept case
studies involving our free and open-source website www.allourideas.org, we show
that pairwise wiki surveys can yield insights that would be difficult to obtain
with other methods.Comment: 24 pages, 8 figures, 1 tabl
ELECTRICITY DEREGULATION: WHAT'S IN STORE FOR THE ENVIRONMENT?
We test the: degree to which electricity consumers will trade off price and environmental attributes, effectiveness of environmental certification, and effectiveness of voluntary versus mandatory environmental disclosure. The type and consistency of information, the degree of difference in environmental attributes and the individual's characteristics all impact the choice of electricity product.Environmental Economics and Policy,
Communicating Applied Mathematics: Four Examples
Communicating Applied Mathematics is a writing- and speaking-intensive graduate course at North Carolina State University. The purpose of this article is to provide a brief description of the course objectives and the assignments. Parts A–D of of this article represent the class projects and illustrate the outcome of the course:
• The Evolution of an Optimization Test Problem: From Motivation to Implementation, by Daniel E. Finkel and Jill P. Reese
• Finding the Volume of a Powder from a Single Surface Height Measurement, by Christopher Kuster
• Finding Oscillations in Resonant Tunneling Diodes, by Matthew Lasater
• A Shocking Discovery: Nonclassical Waves in Thin Liquid Films, by Rachel Lev
Willingness of Community-Recruited Men Who Have Sex with Men in Washington, DC to Use Long-Acting Injectable HIV Pre-Exposure Prophylaxis.
Objectives
Clinical trials are currently investigating the safety and efficacy of long-acting injectable (LAI) agents as HIV pre-exposure prophylaxis (PrEP). Using National HIV Behavioral Surveillance data, we assessed the self-reported willingness of men who have sex with men (MSM) to use LAI PrEP and their preference for LAI versus daily oral PrEP. Methods
In 2014, venue-based sampling was used to recruit MSM aged ≥18 years in Washington, DC. Participants completed an interviewer-administered survey followed by voluntary HIV testing. This analysis included MSM who self-reported negative/unknown HIV status at study entry. Correlates of being “very likely” to use LAI PrEP and preferring it to daily oral PrEP were identified using multivariable logistic regression. Results
Of 314 participants who self-reported negative/unknown HIV status, 50% were \u3c30 years old, 41% were non-Hispanic Black, 37% were non-Hispanic White, and 14% were Hispanic. If LAI PrEP were offered for free or covered by health insurance, 62% were very likely, 25% were somewhat likely, and 12% were unlikely to use it. Regarding preferred PrEP modality, 67% chose LAI PrEP, 24% chose oral PrEP, and 9% chose neither. Correlates of being very likely versus somewhat likely/unlikely to use LAI PrEP included age \u3c30 years (aOR 1.64; 95% CI 1.00–2.68), reporting ≥6 (vs. 1) sex partners in the last year (aOR 2.60; 95% CI 1.22–5.53), previous oral PrEP use (aOR 3.67; 95% CI 1.20–11.24), and being newly identified as HIV-infected during study testing (aOR 4.83; 95% CI 1.03–22.67). Black (vs. White) men (aOR 0.48; 95% CI 0.24–0.96) and men with an income of \u3c75,000; aOR 0.37; 95% CI 0.15–0.93) were less likely to prefer LAI to oral PrEP. Conclusions
If LAI PrEP were found to be efficacious, its addition to the HIV prevention toolkit could facilitate more complete PrEP coverage among MSM at risk for HIV
Optimized pulses for the control of uncertain qubits
Constructing high-fidelity control fields that are robust to control, system,
and/or surrounding environment uncertainties is a crucial objective for quantum
information processing. Using the two-state Landau-Zener model for illustrative
simulations of a controlled qubit, we generate optimal controls for \pi/2- and
\pi-pulses, and investigate their inherent robustness to uncertainty in the
magnitude of the drift Hamiltonian. Next, we construct a quantum-control
protocol to improve system-drift robustness by combining environment-decoupling
pulse criteria and optimal control theory for unitary operations. By
perturbatively expanding the unitary time-evolution operator for an open
quantum system, previous analysis of environment-decoupling control pulses has
calculated explicit control-field criteria to suppress environment-induced
errors up to (but not including) third order from \pi/2- and \pi-pulses. We
systematically integrate this criteria with optimal control theory,
incorporating an estimate of the uncertain parameter, to produce improvements
in gate fidelity and robustness, demonstrated via a numerical example based on
double quantum dot qubits. For the qubit model used in this work, post facto
analysis of the resulting controls suggests that realistic control-field
fluctuations and noise may contribute just as significantly to gate errors as
system and environment fluctuations.Comment: 38 pages, 15 figures, RevTeX 4.1, minor modifications to the previous
versio
Survival of young patients after abdominal aortic aneurysm repair
AbstractPurpose: This study assessed the cardiovascular disease, perioperative results, and survival after surgical abdominal aortic aneurysm repair in young patients (≤ 50 years) compared with randomly selected older patients who also underwent abdominal aortic aneurysm repair. Methods: We reviewed hospital records to identify young and randomly selected control patients (3 for each young patient, ≥ 65 years, matched for year of operation) with degenerative (atherosclerotic) abdominal aortic aneurysms undergoing repair between Jan 1, 1988, and Mar 31, 2000. Patients with congenital aneurysms, pseudoaneurysms, aortic dissections, post-coarctation dilations, aortic infection, arteritis, or aneurysms isolated to the thoracic aorta were excluded. Mortality data and cause of death were obtained from medical records and the National Death Index Results: Among 1168 patients who underwent abdominal aortic aneurysm repairs, 19 young patients (1.6%) and 57 control patients were identified. The mean age was 48.4 years in the young group and 72.2 years in the control group. There were no differences in sex or race between the two groups. When comparing existing cardiovascular disease between the groups, there were no differences in the incidence of earlier coronary revascularization (26% vs 16%) or non-cardiac vascular surgery (5% vs 9%), but aneurysms were more commonly symptomatic in young patients (53% vs 21%; P <.01). Aneurysmal disease was limited to the infrarenal aorta in similar proportions of patients (89% vs 88%). No statistically significant differences were seen in the incidence of perioperative deaths (16% young vs 9% control; P =.40) or postoperative complications (37% young vs 26% control; P =.38). The estimated survival rate of the young group was not different from that of the control group (3-year survival rate, 73% vs 69%; P =.32) or the entire cohort of patients (older than 50 years; n = 1101) who underwent repair of abdominal aortic aneurysms during the study period (3-year survival 73% vs 75%; P =.63) Conclusion: After abdominal aortic aneurysm repair, young patients had perioperative results and follow-up mortality rates similar to those of control patients. Cardiovascular disease was the predominant cause of death after abdominal aortic aneurysm repair in the young patients. When compared with an age older than 50 years at the time of abdominal aortic aneurysm repair, young age alone was not associated with increased survival. (J Vasc Surg 2002;35:94-9.
Nitrous oxide emissions from a peatbog after 13 years of experimental nitrogen deposition
Nitrogen deposition was experimentally increased on a Scottish peatbog over a period of 13 years (2002–2015). Nitrogen was applied in three forms, NH3 gas, NH4Cl solution, and NaNO3 solution, at rates ranging from 8 (ambient) to 64 kg N ha−1 yr−1, and higher near the NH3 fumigation source. An automated system was used to apply the nitrogen, such that the deposition was realistic in terms of rates and high frequency of deposition events. We measured the response of nitrous oxide (N2O) flux to the increased nitrogen input. Prior expectations, based on the IPCC default emission factor, were that 1 % of the added nitrogen would be emitted as N2O. In the plots treated with NH4+ and NO3− solution, no response was seen, and there was a tendency for N2O fluxes to be reduced by additional nitrogen, though this was not significant. Areas subjected to high NH3 emitted more N2O than expected, up to 8.5 % of the added nitrogen. Differences in the response are related to the impact of the nitrogen treatments on the vegetation. In the NH4+ and NO3− treatments, all the additional nitrogen is effectively immobilised in the vegetation and top 10 cm of peat. In the NH3 treatment, much of the vegetation was killed off by high doses of NH3, and the nitrogen was presumably more available to denitrifying bacteria. The design of the wet and dry experimental treatments meant that they differed in statistical power, and we are less likely to detect an effect of the NH4+ and NO3− treatments, though they avoid issues of pseudo-replication
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