Facile Fabrication of "Tacky", Stretchable, and Aligned Carbon Nanotube Sheet-Based Electronics for On-Skin Health Monitoring.

Point-of-care monitoring of physiological signals such as electrocardiogram, electromyogram, and electroencephalogram is essential for prompt disease diagnosis and quick treatment, which can be realized through advanced skin-worn electronics. However, it is still challenging to design an intimate and nonrestrictive skin-contact device for physiological measurements with high fidelity and artifact tolerance. This research presents a facile method using a "tacky" surface to produce a tight interface between the ACNT skin-like electronic and the skin. The method provides the skin-worn electronic with a stretchability of up to 70% strain, greater than that of most common epidermal electrodes. Low-density ACNT bundles facilitate the infiltration of adhesive and improve the conformal contact between the ACNT sheet and the skin, while dense ACNT bundles lessen this effect. The stretchability and conformal contact allow the ACNT sheet-based electronics to create a tight interface with the skin, which enables the high-fidelity measurement of physiological signals (the Pearson's coefficient of 0.98) and tolerance for motion artifacts. In addition, our method allows the use of degradable substrates to enable reusability and degradability of the electronics based on ACNT sheets, integrating "green" properties into on-skin electronics.

Enhanced Photovoltaic Effect in n-3C-SiC/p-Si Heterostructure Using a Temperature Gradient for Microsensors.

The development of fifth-generation (5G) communications and the Internet of Things (IoT) has created a need for high-performance sensing networks and sensors. Improving the sensitivity and reducing the energy consumption of these sensors can improve the performance of the sensing network and conserve energy. This paper reports a large enhancement of the photovoltaic effect in a 3C-SiC/Si heterostructure and the tunability of the photovoltage under the impact of a temperature gradient, which has the potential to increase the sensitivity and reduce the energy consumption of microsensors. To start with, cubic silicon carbide (3C-SiC) was grown on a silicon wafer, and a micro-3C-SiC/Si heterostructure device was then fabricated using standard photolithography. The result revealed that the sensor could either capture light energy, transform it into electrical energy for self-power purposes, or detect light with intensities of 1.6 and 4 mW/cm2. Under the impact of the temperature gradient induced by conduction heat transfer from a heater, the measured photovoltage was improved. This thermo-phototronic coupling enhanced the photovoltage up to 51% at a temperature gradient of 8.73 K and light intensity of 4 mW/cm2. Additionally, the enhancement can be tuned by controlling the direction of the temperature gradient and the temperature difference. These findings indicate the promise of the temperature gradient in SiC/Si heterostructures for developing high-performance temperature sensors and self-powered photodetectors.

The relationship between financial decisions and equity risk.

This study was conducted to determine the impact of financial decisions on equity risk in enterprises. The factors representing financial decisions include investment decisions, working capital decisions, and funding decisions. The equity risk is represented by beta in firms. Research and analysis of panel data with generalized least squares (GLS) via industry construction companies listed on the Vietnam Stock Exchange from 2015 to 2019. The data analysis results show that investment decisions do not affect equity risk, working capital decisions have a positive impact on equity risk, and funding decisions have a negative impact on equity risk. Furthermore, this study shows that agency theory does not exist in the relationship between financial decisions and equity risk in industry-construction enterprises in Vietnam. From this result, the authors also provide implications to help investors and corporation managers make decisions according to their goals based on signs of financial decisions.

The COVID-19 pandemic: Workplace safety management practices, job insecurity, and employees' organizational citizenship behavior.

How do organizations and employees react to the COVID-19 pandemic? Can workplace safety management practices (WSPs) maintain employees' organizational citizenship behavior (OCB) in this time of global health crisis? Can employees' perceptions of the risk associated with COVID-19 and job insecurity mediate the WSPs-OCB relationship? Drawing upon social exchange and protection motivation theories, this research aims to answer such questions. Analyzing the survey data from 501 Vietnamese employees using SmartPLS software, we find that WSPs positively influence the OCB and negatively influence the perceived job insecurity. Furthermore, the perceived risk associated with COVID-19 positively affects perceived job insecurity and OCB. Unexpectedly, in the context of Vietnam, a developing country with a collectivist culture, WSPs increase the employees' perceived risk associated with COVID-19 instead of reducing their fear. Also, employees' perceptions of job insecurity are not statistically correlated with OCB. In addition, we reveal a partial mediating role of the perceived risk associated with COVID-19 in the WSPs-OCB relationship. This research highlights the power of WSPs as well as measures to psychologically reassure employees during the pandemics.

Impact of the Covid-19 pandemic on perceptions and behaviors of university students in Vietnam.

This article presents a novel data set on perceptions and behaviors of university students collected after the beginning of the Covid-19 outbreak in Vietnam. Our questionnaire design is based on employing both qualitative interview with students and survey of SARS literature, probing into the sensitivity of students toward the crisis in making crucial decisions of daily routines, as well as future travel plans in presence of a grave health concern. The data set consists of 440 valid responses from Vietnamese university students through Internet platforms (Facebook, Google Form). Besides descriptive statistics, this article also includes the results of explanatory factor analysis, which may serve as a good reference for future studies.