E-Learning in Era of COVID-19 Pandemic: Impact of Flexible Working Arrangements on Work Pressure, Work–Life Conflict and Academics’ Satisfaction

The aim of this study is to better understand the effect of flexible working arrangements (FWAs) on three academics’ outcomes, which are work pressure, work–life conflict and satisfaction during the ongoing COVID-19 pandemic. A quantitative approach using probability-sampling technique was performed to collect the data. A total of 132 responses were considered in this study. The sample includes academics from Middle East and North Africa region. This research used the method of partial least squares to test the research hypotheses. The findings showed that there are significant effects between flexible working-time arrangements, work pressure, work–life conflict with academics’ satisfaction. Yet, both work pressure and work–life conflict do not have moderator roles on the relationship between FWAs and academics’ satisfaction. The research results could be applied by university human resources’ managers seeking to introduce flexible schedules in the workplace in the context of uncertainty. The study makes a novel contribution to the effect of flexible schedules on the attitude of academics during a health crisis (COVID-19).

Fatigue Detection with Spatial-Temporal Fusion Method on Covariance Manifolds of Electroencephalography

With the increasing pressure of current life, fatigue caused by high-pressure work has deeply affected people and even threatened their lives. In particular, fatigue driving has become a leading cause of traffic accidents and deaths. This paper investigates electroencephalography (EEG)-based fatigue detection for driving by mining the latent information through the spatial-temporal changes in the relations between EEG channels. First, EEG data are partitioned into several segments to calculate the covariance matrices of each segment, and then we feed these matrices into a recurrent neural network to obtain high-level temporal information. Second, the covariance matrices of whole signals are leveraged to extract two kinds of spatial features, which will be fused with temporal characteristics to obtain comprehensive spatial-temporal information. Experiments on an open benchmark showed that our method achieved an excellent classification accuracy of 93.834% and performed better than several novel methods. These experimental results indicate that our method enables better reliability and feasibility in the detection of fatigued driving.

Burnout and Stressor-Related Factors among Caretaker of Children with Chronic Neurological Illness

Objective: Caring for children with neurological conditions is challenging. This study aimed to determine the prevalence of burnout and its associated factors among caretakers of children with chronic neurological illness. Method: This cross-sectional study involved 18 years or older caretakers of children with neurological illness for more than 3 months duration. They were recruited from Paediatric Neurology outpatient clinics over a period of 3 months from July to October 2019 at a general hospital in the state of Kelantan, Malaysia. Each caretaker was given a set of questionnaires that included General Stressor Questionnaire (GSQ) which was translated into Malay version ‘Soal Selidik Umum (SSU)’, Copenhagen Burnout Inventory-Malay version (CBI-M) and Demographic Information Form. Results: Overall, only 20 caretakers had mean score of 50 or higher in all component in CBI-M, making the prevalence of total burnout among the caretakers of 8.3% (95% CI = 5.2%, 12.6%). Personal burnout involved 78 caretakers (32.5%, 95% CI = 26.6%, 38.8%), 42 caretakers with client-related burnout (17.5%, 95% CI = 12.9%, 22.9%) and 11 caretakers had work-related burnout (4.6%, 95% CI = 2.3%, 8.1%). Most common stressors were performance pressure, work-family conflict and poor job prospects. Multiple logistic regression analyses showed that family stressors, types of children’s neurological illness and number of household occupants were associated with personal burnout, client-related burnout and total burnout in their caretakers. Conclusions: Prevalence of total burnout among the caretakers was low, but personal burnout was prominent. Caretakers of children with genetic illness, cerebral palsy and autism had higher prevalence of burnout compared to other chronic neurological illness.

High-pressure behavior of disodered kesterite-type Cu2ZnSnS4

We have investigated the high-pressure structural and vibrational behavior of the disordered kesterite-type Cu2ZnSnS4 compound at ambient temperature. Our experimental and theoretical investigations have revealed a clear structural transition to a GeSb-type phase close to 15 GPa, a tetragonally distorted variant of the NaCl-type phase. The latter transformation is accompanied by a cationic coordination increase from fourfold to sixfold with respect to the sulfur anions. In addition, a change in the compressibility rate was detected at about 8 GPa within the pressure stability range of the disordered kesterite-type phase. Upon decompression, a disordered zinc blende/sphalerite structure is recovered. We discuss our findings in close conjunction with our recent high-pressure work on the ordered Cu2ZnSnS4 modification.

Numerical Investigation on Wellbore Temperature Prediction during the CO2 Fracturing in Horizontal Wells

A novel model is established to predict the temperature field in the horizontal wellbore during CO2 fracturing. The pressure work and viscous dissipation are considered, and the transient energy, mass and momentum equations as well as the CO2 physical properties are solved fully coupled. The model passes the convergence test and is verified through a comparison using the COMSOL software. Then, a sensitivity analysis is performed to study the effects of the treating parameters. Results illustrate that the relationship between the injection rate and the stable bottom-hole temperature (hereinafter referred to as BHT) is non-monotonic, which is different from the hydraulic fracturing. The existence of the horizontal section will increase the BHT at 2 m3/min condition but reduce the BHT at 10 m3/min condition. The problem of high wellbore friction can be alleviated through tube size enhancement, and the ultimate injection rate allowed increased from 2.7 m3/min to 29.6 m3/min when the tube diameter increased from 50.3 mm to 100.3 mm. Additionally, the open-hole completion method of the horizontal section can increase the BHT to 2.7 °C but reduce the near formation temperature to 24.5 °C compared with the casing completion method.

Dynamics of the Layered Circulation Inferred from Kinetic Energy Pathway in the South China Sea

We investigated the mean kinetic energy (MKE) and eddy kinetic energy (EKE) in the South China Sea to illustrate the dynamics of the vertically rotating cyclonic–anticyclonic–cyclonic (CAC) circulation in the upper, middle, and deep layers. We found that strong MKE along the basin slope and the associated EKE arising from the vertical shear and stratification of the mean current characterize the circulation. In the upper layer, the external MKE input from the Kuroshio intrusion and wind forcing drive the cyclonic circulation, with the wind forcing providing most of the EKE. External forcing, however, does not directly provide the MKE and EKE of the CAC circulation in the semi-enclosed middle and deep layers, where the internal pressure work near Luzon Strait and the vertical buoyancy flux (VBF) in the southern basin and along the western slope maintain the MKE and EKE. The internal pressure work is formed by ageostrophic motion and pressure gradient field associated with circulation. The VBF is generated by vertical motion induced by the geostrophic cross-isobath transport along the slope where variable density field is maintained by the external flow and the internal mixing. The kinetic energy pathway in the CAC circulation indicates that the external forcing dominates upper-layer circulation and the coupling between internal and external dynamics is crucial for maintaining the circulation in the middle and deep layers. This study provides a new interpretation to the maintenance of CAC circulation from energy prospect.

How Alfvén waves energize the solar wind: heat versus work

A growing body of evidence suggests that the solar wind is powered to a large extent by an Alfvén-wave (AW) energy flux. AWs energize the solar wind via two mechanisms: heating and work. We use high-resolution direct numerical simulations of reflection-driven AW turbulence (RDAWT) in a fast-solar-wind stream emanating from a coronal hole to investigate both mechanisms. In particular, we compute the fraction of the AW power at the coronal base ( $P_\textrm {AWb}$ ) that is transferred to solar-wind particles via heating between the coronal base and heliocentric distance $r$ , which we denote by $\chi _{H}(r)$ , and the fraction that is transferred via work, which we denote by $\chi _{W}(r)$ . We find that $\chi _{W}(r_{A})$ ranges from 0.15 to 0.3, where $r_{A}$ is the Alfvén critical point. This value is small compared with one because the Alfvén speed $v_{A}$ exceeds the outflow velocity $U$ at $r < r_{A}$ , so the AWs race through the plasma without doing much work. At $r>r_{A}$ , where $v_{A} < U$ , the AWs are in an approximate sense ‘stuck to the plasma’, which helps them do pressure work as the plasma expands. However, much of the AW power has dissipated by the time the AWs reach $r=r_{A}$ , so the total rate at which AWs do work on the plasma at $r>r_{A}$ is a modest fraction of $P_\textrm {AWb}$ . We find that heating is more effective than work at $r < r_{A}$ , with $\chi _{H}(r_{A})$ ranging from 0.5 to 0.7. The reason that $\chi _{H} \geq 0.5$ in our simulations is that an appreciable fraction of the local AW power dissipates within each Alfvén-speed scale height in RDAWT, and there are a few Alfvén-speed scale heights between the coronal base and $r_{A}$ . A given amount of heating produces more magnetic moment in regions of weaker magnetic field. Thus, paradoxically, the average proton magnetic moment increases robustly with increasing $r$ at $r>r_{A}$ , even though the total rate at which AW energy is transferred to particles at $r>r_{A}$ is a small fraction of $P_\textrm {AWb}$ .