Students’ experiences in learning physical education in an online environment

The start of the Novel Corona Virus in 2019 has been the root cause of the severe disruption of economic opportunities and educational curriculum implementation affecting people's daily living across the world. In the field of education, the pandemic has brought changes to the educational system. A shift in the mode of learning has shifted from face-to-face to online and modular learning, wherein the former has been utilized more. This basic qualitative study was conducted to explore the experiences of students along with their recommendations to further improve the delivery of online physical education. Twenty informants from the different departments of the University of Saint Louis participated in this study through online interviews. In utilizing open coding, axial coding, and selective coding, the results revealed five major recurring themes, to wit: (1) Student-Teacher Interaction, (2) Technology-Related Experience, (3) Online Classroom Experience, (4) Pedagogical-Related Experience, and (5) Personal-Related Experiences. The study concluded that students have both desirable and undesirable experiences in learning online physical education amidst the COVID-19 Pandemic. The informants’ recommendations focused mainly on the teacher’s regular monitoring of students, the use of effective online strategies in teaching physical education, and providing enough time for activities. In addition, implications and recommendations are also discussed

Development of an indirect method of microalgal lipid quantification using a lysochrome dye, Nile red

Earlier studies showed that the lipophilic dye, Nile red (9-diethylamino 5H-benzo[α]phenoxazine-5-one) can be used to measure the lipid content of microalgae by cellular in vivo fluorescence. It was observed that a higher amount of lipid present in lipid droplets of microalgal cells would result in higher degree of emitted fluorescent light. In this present study, the feasibility of using Nile red, a fluorescent dye specific for intracellular lipid droplets, as an indirect method of lipid quantifications was investigated. Following cellular staining of different microalgal species with nile red, the in vivo fluorescence of the whole cell was visualized by fluorescence microscopy (excitation: 450 to 590 nm and emission: 520 nm). Intensity of the relative in vivo fluorescence was measured using a fluorescence spectrophotometer at excitation and emission wavelengths of 485 and 590 nm, respectively. Lipid content was determined gravimetrically and the fluorescence of the extract was measured using the microemulsion method at emission and excitation wavelengths of 540 and 617 nm. The equivalent oil content of the extracted lipid was correlated to the fluorescence of pure olive oil using the microemulsion method. Cellular in vivo fluorescence of stained cells (ex: 485 nm and em: 590 nm), fluorescence of extracted lipid (ex: 540 nm and em: 617 nm) and gravimetrically determined lipid were linearly correlated. This suggests that Nile red can serve as a vital stain which allows a relatively rapid method of determining the lipid content of microalgal samples and is as good as the gravimetric method used for lipid determination, eliminating the requirement for the toxic solvents and timeconsuming manipulations.Keywords: Nile red, microalgae, lipid, fluorescenc

Influencia del bienestar psicológico y subjetivo en el afrontamiento, los hábitos de estudio y uso de TICS en estudiantes universitarios durante la pandemia por COVID-19

Introduction. Salutogenic and biopsychosocial models encourage promoting wellbeing. Studies recognize that they favor study habits. In light of the COVID-19 pandemic, changes led to researching if wellbeing influenced coping, study habits and the use of Information and Communications Technology (ICT) in university students during the COVID-19 pandemic. Methodology. A quantitative, correlational and cross-sectional study was carried out with undergraduate students of different socioeconomic levels from two private institutions in Bogotá, Colombia. The data was analyzed through the partial least squares approach of structural equations modeling. Results. 212 students participated, whose ages were between 18 and 30 (A=22.74 and SD= 5.55). The model yielded a Standardized Root Mean Squared of 0.079. Path coefficient β and statistical coefficient t demonstrated positive and significant relations between psychological wellbeing and proper coping (β=0.50, t=6.75, P=0.000), study habits (β= 0.49, t=5.49, P=0.000) and the use of ICT (β=0.29, t=2.70, P=0.007), and negative relations to improper coping (β=-0.35, t=4.28, P=0.000). The same applies to the relationship between subjective wellbeing and improper coping (β=-0.23, t=2.76, P=0.006) and study habits (β=-0.21, t=2.09, P=0.037). Discussion. The findings of other research on the influence of wellbeing on favoring mental health were validated. Conclusions. Positive and significant relationships were demonstrated between wellbeing and proper coping, study habits and the use of ICT, and negative relationships were observed with improper coping.Introducción. Los modelos salutogénico y biopsicosocial fomentan la promoción del bienestar. Estudios reconocen que favorece los hábitos de estudio. Ante la pandemia por COVID-19, los cambios llevaron a investigar si el bienestar influye en el afrontamiento, los hábitos de estudio y el uso de las Tecnologías de la Información y la Comunicación (TIC) en estudiantes universitarios durante la pandemia por COVID-19. Metodología. Se realizó una investigación cuantitativa, correlacional y transversal con estudiantes de pregrado de diferentes niveles socioeconómicos, de dos instituciones privadas de Bogotá, Colombia. Los datos se analizaron a través del enfoque de mínimos cuadrados parciales del modelo de ecuaciones estructurales. Resultados. Participaron 212 estudiantes cuyas edades estaban entre 18 y 30 años (M=22.74 y DE= 5.55). Se cumplió el modelo con una Raíz Cuadrada Media Estandarizada de 0.079. Los coeficientes de ruta β y el estadístico t evidenciaron relaciones positivas y significativas entre el bienestar psicológico y el afrontamiento adecuado (β=0.50, t=6.75, P=0.000), los hábitos de estudio (β= 0.49, t=5.49, P=0.000) y el uso de las TIC (β=0.29, t=2.70, P=0.007), y negativas con el afrontamiento inadecuado (β=-0.35, t=4.28, P=0.000). También entre el bienestar subjetivo y el afrontamiento inadecuado (β=-0.23, t=2.76, P=0.006) y los hábitos de estudio (β=-0.21, t=2.09, P=0.037). Discusión. Se validan hallazgos de otras investigaciones sobre la influencia del bienestar para favorecer la salud mental. Conclusiones. Se evidenciaron relaciones positivas y significativas entre el bienestar y el afrontamiento adecuado, los hábitos de estudio y el uso de las TIC, y negativas con el afrontamiento inadecuado

Design Optimization of DR3AM Vapor Polishing Device for ABS 3D-Printed Parts

3D printing is an additive manufacturing method that turns digital design into an actual product. A 3D-printed part sometimes requires post-processing to enhance its physical and mechanical properties. Acetone vapor polishing is one of those techniques which is highly beneficial in smoothing ABS 3D-printed parts. Previously, an acetone vapor polishing device has been developed which uses a mist maker. However, for a more efficient polishing method, an optimized vapor polishing device using heat has been fabricated in this study. To assess the efficiency of this device, the researchers test the dimensional accuracy, surface roughness, tensile strength, and impact strength of polished and unpolished ABS 3D-printed specimens. The findings showed that the surface smoothness of the polished cube specimens did not significantly alter its physical geometry. The tensile test reveals that the overall elasticity of the polished tensile specimen has increased significantly while the impact test also shows that the polished specimens have the capacity to sustain a resistive impact from a swinging pendulum. Thus, all testing procedures indicated that post-processing using the optimized vapor polishing device has improved the overall physical and mechanical properties of the polished specimens

Comparison of Inappropriate Shocks and Other Health Outcomes Between Single- and Dual-Chamber Implantable Cardioverter-Defibrillators for Primary Prevention of Sudden Cardiac Death: Results From the Cardiovascular Research Network Longitudinal Study of Implantable Cardioverter-Defibrillators

BACKGROUND: In US clinical practice, many patients who undergo placement of an implantable cardioverter-defibrillator (ICD) for primary prevention of sudden cardiac death receive dual-chamber devices. The superiority of dual-chamber over single-chamber devices in reducing the risk of inappropriate ICD shocks in clinical practice has not been established. The objective of this study was to compare risk of adverse outcomes, including inappropriate shocks, between single- and dual-chamber ICDs for primary prevention. METHODS AND RESULTS: We identified patients receiving a single- or dual-chamber ICD for primary prevention who did not have an indication for pacing from 15 hospitals within 7 integrated health delivery systems in the Longitudinal Study of Implantable Cardioverter-Defibrillators from 2006 to 2009. The primary outcome was time to first inappropriate shock. ICD shocks were adjudicated for appropriateness. Other outcomes included all-cause hospitalization, heart failure hospitalization, and death. Patient, clinician, and hospital-level factors were accounted for using propensity score weighting methods. Among 1042 patients without pacing indications, 54.0% (n=563) received a single-chamber device and 46.0% (n=479) received a dual-chamber device. In a propensity-weighted analysis, device type was not significantly associated with inappropriate shock (hazard ratio, 0.91; 95% confidence interval, 0.59-1.38 [P=0.65]), all-cause hospitalization (hazard ratio, 1.03; 95% confidence interval, 0.87-1.21 [P=0.76]), heart failure hospitalization (hazard ratio, 0.93; 95% confidence interval, 0.72-1.21 [P=0.59]), or death (hazard ratio, 1.19; 95% confidence interval, 0.93-1.53 [P=0.17]). CONCLUSIONS: Among patients who received an ICD for primary prevention without indications for pacing, dual-chamber devices were not associated with lower risk of inappropriate shock or differences in hospitalization or death compared with single-chamber devices. This study does not justify the use of dual-chamber devices to minimize inappropriate shocks

Device Therapies Among Patients Receiving Primary Prevention Implantable Cardioverterâ Defibrillators in the Cardiovascular Research Network

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/143721/1/jah33061_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/143721/2/jah33061.pd

Identification and mitigation of narrow spectral artifacts that degrade searches for persistent gravitational waves in the first two observing runs of Advanced LIGO

Searches are under way in Advanced LIGO and Virgo data for persistent gravitational waves from continuous sources, e.g. rapidly rotating galactic neutron stars, and stochastic sources, e.g. relic gravitational waves from the Big Bang or superposition of distant astrophysical events such as mergers of black holes or neutron stars. These searches can be degraded by the presence of narrow spectral artifacts (lines) due to instrumental or environmental disturbances. We describe a variety of methods used for finding, identifying and mitigating these artifacts, illustrated with particular examples. Results are provided in the form of lists of line artifacts that can safely be treated as non-astrophysical. Such lists are used to improve the efficiencies and sensitivities of continuous and stochastic gravitational wave searches by allowing vetoes of false outliers and permitting data cleaning

The population of merging compact binaries inferred using gravitational waves through GWTC-3

We report on the population properties of 76 compact binary mergers detected with gravitational waves below a false alarm rate of 1 per year through GWTC-3. The catalog contains three classes of binary mergers: BBH, BNS, and NSBH mergers. We infer the BNS merger rate to be between 10 $\rm{Gpc^{-3} yr^{-1}}$ and 1700 $\rm{Gpc^{-3} yr^{-1}}$ and the NSBH merger rate to be between 7.8 $\rm{Gpc^{-3}\, yr^{-1}}$ and 140 $\rm{Gpc^{-3} yr^{-1}}$ , assuming a constant rate density versus comoving volume and taking the union of 90% credible intervals for methods used in this work. Accounting for the BBH merger rate to evolve with redshift, we find the BBH merger rate to be between 17.9 $\rm{Gpc^{-3}\, yr^{-1}}$ and 44 $\rm{Gpc^{-3}\, yr^{-1}}$ at a fiducial redshift (z=0.2). We obtain a broad neutron star mass distribution extending from $1.2^{+0.1}_{-0.2} M_\odot$ to $2.0^{+0.3}_{-0.3} M_\odot$. We can confidently identify a rapid decrease in merger rate versus component mass between neutron star-like masses and black-hole-like masses, but there is no evidence that the merger rate increases again before 10 $M_\odot$. We also find the BBH mass distribution has localized over- and under-densities relative to a power law distribution. While we continue to find the mass distribution of a binary's more massive component strongly decreases as a function of primary mass, we observe no evidence of a strongly suppressed merger rate above $\sim 60 M_\odot$. The rate of BBH mergers is observed to increase with redshift at a rate proportional to $(1+z)^{\kappa}$ with $\kappa = 2.9^{+1.7}_{-1.8}$ for $z\lesssim 1$. Observed black hole spins are small, with half of spin magnitudes below $\chi_i \simeq 0.25$. We observe evidence of negative aligned spins in the population, and an increase in spin magnitude for systems with more unequal mass ratio

Search for gravitational waves associated with gamma-ray bursts detected by Fermi and Swift during the LIGO–Virgo run O3b

We search for gravitational-wave signals associated with gamma-ray bursts (GRBs) detected by the Fermi and Swift satellites during the second half of the third observing run of Advanced LIGO and Advanced Virgo (2019 November 1 15:00 UTC–2020 March 27 17:00 UTC). We conduct two independent searches: a generic gravitational-wave transients search to analyze 86 GRBs and an analysis to target binary mergers with at least one neutron star as short GRB progenitors for 17 events. We find no significant evidence for gravitational-wave signals associated with any of these GRBs. A weighted binomial test of the combined results finds no evidence for subthreshold gravitational-wave signals associated with this GRB ensemble either. We use several source types and signal morphologies during the searches, resulting in lower bounds on the estimated distance to each GRB. Finally, we constrain the population of low-luminosity short GRBs using results from the first to the third observing runs of Advanced LIGO and Advanced Virgo. The resulting population is in accordance with the local binary neutron star merger rate