Applying John Dewey\u27s Theory of Education to Infuse Experiential Learning in an Introduction to Human Services Course

Teaching an introductory human services course is challenging, as educators must provide an overview of effective practice in a highly diverse field. Researchers conducted a review of all of the prior editions of the Journal of Human Services (JHS) to identify previous research on experiential learning strategies in human services education. This brief note examines the pedagogical practice of experiential learning and the application of John Dewey\u27s theory for successfully training students in an Introduction to Human Services course

Nanoscopic surface inspection by analyzing the linear polarization degree of the scattered light

We present an optical method for the nanoscopic inspection of surfaces. The method is based on the spectral and polarization analysis of the light scattered by a probe nanoparticle close to the inspected surface. We explore the sensitivity to changes either in the probe–surface distance or in the refractive index of the surface

Shaping the Beam of Light in Nanometer Scales: A Yagi-Uda Nanoantenna in Optical Domain

A Yagi-Uda-like optical nanoantenna concept using resonant core-shell plasmonic particles as its "reflectors" and "directors" is studied numerically. Such particles when placed near an optical dipole source in a certain arrangement may exhibit large induced dipole moments, resulting in shaping the far-field radiation pattern, analogous to the far field of classical Yagi-Uda antennas in the microwave regime. Variation of the ratio of radii in concentric core-shell nanostructure is used to tailor the phase of the polarizabilities of the particles, and consequently the antenna's far-field pattern. The idea of a nanospectrum analyzer is also briefly proposed for molecular spectroscopy.Comment: under revie

Residential Community College Student Awareness of Mental Health Problems and Resources

An exploratory survey study assessed community college student awareness of signs, risk factors, and resources for depression, anxiety, and substance abuse. The majority of the participants reported adequate awareness of mental disorders. Females were more likely than males and sophomores were more likely than freshmen to recognize signs and risk factors of mental illness. Half of the participants were unaware of campus mental health resources. Strategies for increasing student awareness of mental health problems, counseling, and other campus resources for mental illness are presented

Community College Student Awareness of Mental Health Problems and Resources

An exploratory survey study assessed community college student awareness of signs, risk factors, and resources for depression, anxiety, and substance abuse. The majority of the participants reported adequate awareness of mental disorders. Females were more likely than males and sophomores were more likely than freshmen to recognize signs and risk factors of mental illness. Half of the participants were unaware of campus mental health resources. Strategies for increasing student awareness of mental health problems, counseling, and other campus resources for mental illness are presented

Measuring the quantum efficiency of single radiating dipoles using a scanning mirror

Using scanning probe techniques, we show the controlled manipulation of the radiation from single dipoles. In one experiment we study the modification of the fluorescence lifetime of a single molecular dipole in front of a movable silver mirror. A second experiment demonstrates the changing plasmon spectrum of a gold nanoparticle in front of a dielectric mirror. Comparison of our data with theoretical models allows determination of the quantum efficiency of each radiating dipole.Comment: 4 pages, 4 figure

Resolution and enhancement in nanoantenna-based fluorescence microscopy

Single gold nanoparticles can act as nanoantennas for enhancing the fluorescence of emitters in their near-fields. Here we present experimental and theoretical studies of scanning antenna-based fluorescence microscopy as a function of the diameter of the gold nanoparticle. We examine the interplay between fluorescence enhancement and spatial resolution and discuss the requirements for deciphering single molecules in a dense sample. Resolutions better than 20 nm and fluorescence enhancement up to 30 times are demonstrated experimentally. By accounting for the tip shaft and the sample interface in finite-difference time-domain calculations, we explain why the measured fluorescence enhancements are higher in the presence of an interface than the values predicted for a homogeneous environment.Comment: 10 pages, 3 figures. accepted for publication in Nano Letter

Effects of HEPA Air Cleaners on Unscheduled Asthma Visits and Asthma Symptoms for Children Exposed to Secondhand Tobacco Smoke

The goal was to test the effects of high-efficiency, particulate-arresting (HEPA) air cleaners on unscheduled asthma visits and symptoms among children with asthma exposed to secondhand smoke

Plasmon oscillations in ellipsoid nanoparticles: beyond dipole approximation

The plasmon oscillations of a metallic triaxial ellipsoid nanoparticle have been studied within the framework of the quasistatic approximation. A general method has been proposed for finding the analytical expressions describing the potential and frequencies of the plasmon oscillations of an arbitrary multipolarity order. The analytical expressions have been derived for an electric potential and plasmon oscillation frequencies of the first 24 modes. Other higher orders plasmon modes are investigated numerically.Comment: 33 pages, 12 figure