ABSTRACT
This study investigated the impact of the perceived authenticity of brands' COVID-19 advertisements on consumers' perception of brand warmth and the subsequent responses on brand attitude and engagement intention. An online survey was used to acquire consumers' evaluations of COVID-19 video ads published between March and August in 2020. Results showed that the message authenticity significantly increased consumers' perception of brand warmth, brand attitude, and engagement intention. Furthermore, the serial mediation results revealed the underlying mechanism that authentic ads evoked positively valenced emotional responses, which increased perceived brand warmth and further resulted in positive brand attitudes and engagement intentions. Practical implications and theoretical advancement are also discussed.
ABSTRACT
Our study indicates sustained transmission (effective reproduction number, 1.3; serial interval, 4.2 days; regional doubling times, 3.3-11.4 days) of the severe acute respiratory syndrome coronavirus 2 Omicron (B.1.1.529) variant (N = 2351) in South Korea (25 November 2021-8 January 2022), implicating insufficient protection through vaccination and supporting nonpharmaceutical control measures.
ABSTRACT
Our study indicates sustained transmission (effective reproduction number 1.3;serial interval 4.2 days;regional doubling times 3.3–11.4 days) of the severe acute respiratory syndrome coronavirus 2 Omicron (B.1.1.529) variant (n = 2351) in South Korea (November 25, 2021–January 8, 2022), implicating insufficient protection through vaccination and supporting non-pharmaceutical control measures.
ABSTRACT
The number of antibiotic compounds in wastewaters has been growing globally due to the covid-19 problem. Using antibiotics to treat the patients would produce larger amounts of these compounds into the environment with negative impacts. Hence, finding out the method for the elimination of toxic organic pollutants as well as antibiotics in water is urgent (In this study, the treatment of antibiotic pollutants including cefalexin (CF) and tetracycline (TC) was investigated by applying the advanced oxidation process based on Ni-doped TiO2 (Ni-TiO2). The characterizations technologies such as XRD, XPS, UV-vis, PL, and PC indicated that Ni doping would improve the photocatalytic performance of TiO2. In the photodegradation experiments, the Ni-TiO2 possessed high photocatalytic degradation efficiencies with 93.6% for CF and 82.5% for TC. Besides, the removal rates of antibiotics after five cycles are higher than 75%, implying excellent stability of Ni-TiO2 photocatalyst. The result from the treatment of wastewater samples revealed that the Ni-TiO2 photocatalytic had good performance for removal of CF and TC at a high level of 88.6 and 80.2%, respectively.
Subject(s)
COVID-19 , Environmental Pollutants , Water Pollutants, Chemical , Anti-Bacterial Agents , Catalysis , Humans , Photolysis , Tetracycline , Titanium , WastewaterABSTRACT
Recent outbreaks and the worldwide spread of COVID-19 have challenged mankind with unprecedented difficulties. The introduction of autonomous disinfection robots appears to be indispensable as consistent sterilization is in desperate demand under limited manpower. In this study, we developed an autonomous navigation robot capable of recognizing objects and locations with a high probability of contamination and capable of providing quantified sterilization effects. In order to quantify the 99.9% sterilization effect of various bacterial strains, as representative contaminants with robots operated under different modules, the operating parameters of the moving speed, distance between the sample and the robot, and the radiation angle were determined. We anticipate that the sterilization effect data we obtained with our disinfection robot, to the best of our knowledge, for the first time, will serve as a type of stepping stone, leading to practical applications at various sites requiring disinfection.