Establishing Program Standards to Meet the Needs of Postsecondary Trade and Industrial Education

The focus of this study was to develop standards that can be used for establishing and assessing high-quality postsecondary trade and industrial programs. A four-round Delphi technique was used to generate consensus regarding program standards. The panel of experts, comprised of postsecondary administrators of trade and industrial programs, was used to determine which program standards should guide the development and assessment of high-quality trade and industrial education programs. The result was a list of 17 standards and descriptions. The standards included Academic Integration, Advisory Committee, Curriculum, Employer Feedback, Faculty Qualifications, Meaningful Employment, Placement Rates, Program Design, Program Review, Safety, Soft Skills, Student Achievement of Industry Credentials, Student Assessment, Student Advancement, Student Remediation, and Tools and Equipment. Postsecondary administrators can use the results to develop and assess existing programs, as well as to guide the design of new programs that meet industry labor needs

Estrategia integral de uso de TIC’s para la enseñanza de las ciencias experimentales en nivel medio superior

El presente proyecto de intervención pretendió contribuir a la mejora en la enseñanza de las ciencias experimentales a nivel educativo medio superior, a través de una estrategia integral de uso de plataformas didácticas tomando como referencia el marco de enseñanza para la comprensión de David Perkins (1994), para generar aprendizajes significativos de los contenidos de la materia de Física I en tercer semestre de bachillerato, de un colegio privado en el municipio de Tlajomulco de Zúñiga. La intervención fue realizada durante el periodo de confinamiento derivado de la contingencia por COVID-19 de agosto a diciembre del 2020, por lo que resulta relevante el uso de TIC ́s en un escenario de enseñanza a distancia, empleando desde plataformas de envíos de tareas hasta aplicaciones de simuladores y gamificación. El uso de estas herramientas logró mejorar el desempeño de los alumnos elevando su promedio grupal un 7% y el cumplimiento de actividades y tareas hasta un 66% comparando el ciclo escolar 2018-2019 con el 2019-2020. Se espera que esta intervención contribuya a la innovación educativa en bachillerato y pueda ser probada en otros niveles educativos a futuro.ITESO, A. C

Career and Technical Education Teachers’ Perceptions of Their Profession and Willingness to Encourage Students to Enter a CTE Teaching Career

This study examined the current climate of how Virginia CTE teachers perceive their profession and if they are encouraging their students to enter the teaching profession. A survey developed by the National Center for Education Statistics was submitted to CTE teachers in Virginia (n = 743) to address these questions. Descriptive statistics helped to determine that CTE teachers are generally satisfied with their careers but dissatisfied with factors over which they have no control, and the number of teachers recommending the profession to their students in recent years has decreased considerably. A Pareto analysis was conducted, and the results showed the key reasons why teachers are not recommending the CTE teaching profession to their students are salary/benefits and school variables not in their control

Simulation and experimental study of rheological properties of CeO2 – water nanofluid

Open Access. This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.Metal oxide nanoparticles offer great merits over controlling rheological, thermal, chemical and physical properties of solutions. The effectiveness of a nanoparticle to modify the properties of a fluid depends on its diffusive properties with respect to the fluid. In this study, rheological properties of aqueous fluids (i.e. water) were enhanced with the addition of CeO2 nanoparticles. This study was characterized by the outcomes of simulation and experimental results of nanofluids. The movement of nanoparticles in the fluidic media was simulated by a large-scale molecular thermal dynamic program (i.e. LAMMPS). The COMPASS force field was employed with smoothed particle hydrodynamic potential (SPH) and discrete particle dynamics potential (DPD). However, this study develops the understanding of how the rheological properties are affected due to the addition of nanoparticles in a fluid and the way DPD and SPH can be used for accurately estimating the rheological properties with Brownian effect. The rheological results of the simulation were confirmed by the convergence of the stress autocorrelation function, whereas experimental properties were measured using a rheometer. These rheological values of simulation were obtained and agreed within 5 % of the experimental values; they were identified and treated with a number of iterations and experimental tests. The results of the experiment and simulation show that 10 % CeO2 nanoparticles dispersion in water has a viscosity of 2.0–3.3 mPasPeer reviewedFinal Published versio

Improving Interferometric Null Depth Measurements using Statistical Distributions: Theory and First Results with the Palomar Fiber Nuller

A new "self-calibrated" statistical analysis method has been developed for the reduction of nulling interferometry data. The idea is to use the statistical distributions of the fluctuating null depth and beam intensities to retrieve the astrophysical null depth (or equivalently the object's visibility) in the presence of fast atmospheric fluctuations. The approach yields an accuracy much better (about an order of magnitude) than is presently possible with standard data reduction methods, because the astrophysical null depth accuracy is no longer limited by the magnitude of the instrumental phase and intensity errors but by uncertainties on their probability distributions. This approach was tested on the sky with the two-aperture fiber nulling instrument mounted on the Palomar Hale telescope. Using our new data analysis approach alone-and no observations of calibrators-we find that error bars on the astrophysical null depth as low as a few 10-4 can be obtained in the near-infrared, which means that null depths lower than 10-3 can be reliably measured. This statistical analysis is not specific to our instrument and may be applicable to other interferometers

Exploring Intermediate (5-40 au) Scales around AB Aurigae with the Palomar Fiber Nuller

We report on recent Ks-band interferometric observations of the young pre-main-sequence star AB Aurigae obtained with the Palomar Fiber Nuller (PFN). Reaching a contrast of a few 10^−4 inside a field of view extending from 35 to 275 mas (5–40 AU at AB Aur's distance), the PFN is able to explore angular scales that are intermediate between those accessed by coronagraphic imaging and long baseline interferometry. This intermediate region is of special interest given that many young stellar objects are believed to harbor extended halos at such angular scales. Using destructive interference (nulling) between two sub-apertures of the Palomar 200 inch telescope and rotating the telescope pupil, we measured a resolved circumstellar excess at all probed azimuth angles. The astrophysical null measured over the full rotation is fairly constant, with a mean value of 1.52%, and a slight additional azimuthal modulation of ±0.2%. The isotropic astrophysical null is indicative of circumstellar emission dominated by an azimuthally extended source, possibly a halo, or one or more rings of dust, accounting for several percent of the total Ks-band flux. The modest azimuthal variation may be explained by some skewness or anisotropy of the spatially extended source, e.g., an elliptical or spiral geometry, or clumping, but it could also be due to the presence of a point source located at a separation of ~120 mas (17 AU) with ~6 × 10^−3 of the stellar flux. We combine our results with previous Infrared Optical Telescope Array observations of AB Aur at H band, and demonstrate that a dust ring located at ~30 mas (4.3 AU) represents the best-fitting model to explain both sets of visibilities. We are also able to test a few previously hypothesized models of the incoherent component evident at longer interferometric baselines

Update on indications, complications, and outcomes of scleral contact lenses

Background: The role of scleral contact lenses (SCLs) has increasingly expanded since the first lens was fitted more than a century ago. While it was initially prescribed for the management of severely compromised corneas, the indications for modern SCL use have expanded to include less severe diseases. In this review, we aimed to provide an up-to-date overview of the current indications, complications, and outcomes for the various types of SCLs. Methods: In this narrative review, we thoroughly searched the PubMed/MEDLINE database for literature published from January 1980 to November 2021. Only relevant up-to-date English references were included. Furthermore, the figures in this manuscript were derived from our unit’s patient documentation. Results: Currently, SCLs can successfully be used to manage ocular surface diseases, visually rehabilitate irregular corneas, and correct irregular refractive errors. Although newer materials have yielded the same visual outcomes with fewer complications, these consequences still occur in approximately one-third of contact lens wearers, including difficulties in insertion and/or removal, discomfort or pain, and developing either halos, blurriness, or haze. Even though most of these complications are minor and can be easily treated, a good practice is essential to avoid sight-threatening complications such as microbial keratitis. Conclusions: SCLs are indispensable in ophthalmic clinics. The development of better-quality SCLs has increased the number of indications and improved the achievable visual rehabilitation. The future of developing improvements in SCL design, materials, and fit, and the expansion of their indication range is promising

Improving the light collection efficiency of silicon photomultipliers through the use of metalenses

Metalenses are optical devices that implement nanostructures as phase shifters to focus incident light. Their compactness and simple fabrication make them a potential cost-effective solution for increasing light collection efficiency in particle detectors with limited photosensitive area coverage. Here we report on the characterization and performance of metalenses in increasing the light collection efficiency of silicon photomultipliers (SiPM) of various sizes using an LED of 630 nm, and find a six to seven-fold increase in signal for a 1.3×1.3 mm² SiPM when coupled with a 10-mm-diameter metalens manufactured using deep ultraviolet stepper lithography. Such improvements could be valuable for future generations of particle detectors, particularly those employed in rare-event searches such as dark matter and neutrinoless double beta decay