ABSTRACT
: The geomagnetic field at the earth's surface changes over time, including in Indonesia. An accurate regional geomagnetic model is needed. Indonesia conducted just 49 repeat station measurements (out of 68) in epoch 2020.0 due to the COVID-19 pandemic. The regional geomagnetic field was modeled using the collocated cokriging (CC) method, which is proven to be accurate. The results show high accuracy with 1.18 minutes root mean square error (RMSE) for the declination component (D), 11.1 minutes for the inclination component (I), and 36.6 nT for the total intensity component (F). This RMSE indicates a similar result to epoch 2015.0. It is apparent that the problem of fewer data for epoch 2020.0 has been solved using the CC method. The crustal geomagnetic fields are also modeled by combining repeat station data and an enhanced magnetic model (EMM). The crustal field model illustrates that 94% of repeat stations exist in the low values, contributing to global geomagnetic modeling in the future. The low crustal field values have also correlated with great earthquake epicenters (magnitude ≥6). The earthquakes occurred in the crustal field values under 120 nT from 2010 to 2020. © 2023, Pleiades Publishing, Ltd.
ABSTRACT
The prevalence of teen smokers has increased during the Covid-19 pandemic. Smoking behavior occurs due to exposure to advertising and the promotion of cigarettes. This quantitative research was conducted using cross-sectional approach. The purpose of the study was to analyze the relationship between advertising exposure and cigarette promotion on adolescent smoking behavior in Malang Regency during the pandemic using the chi-square test. Random sampling on students from several high schools or equal degree in the Kepanjen District was done with a total of 145 respondents. The results showed that there was no significant relationship between age, types of cigarette advertising media at the point of sale, outdoor media, social media, internet, and newspapers or magazines by adolescent smoking behavior during the Covid-19 pandemic (p-value > 0.05). Exposure to cigarette advertisements on television, total exposure to cigarette advertisements, cigarette promotion, and gender had a significant relationship with adolescent smoking behavior during the pandemic (p value < 0.05). Adolescents are quite highly exposed to the various types of advertisements and promotions of cigarettes that can influence increased smoking behavior during the pandemic. Copyright © the Author(s),2022.
ABSTRACT
Tourism products are not just a single business service but consist of complementary products, including tourism products, travel services, hotels, and attractions. Today tourism has become one of the biggest economic boosters for the Indonesian nation. To support this, good accommodation is needed to attract them to come to Indonesia. During this covid-19 pandemic, the tourism sector is in crisis. But now, this industry tried to recover. This situation is a momentum for the hotel to provide their best service and program. This study aims to evaluate online hotel booking to get the most influenced factor and recommend to the hotel. This study is quantitative research by using DeLone and McLean model to measure the factor. The result shows some factors affected customer satisfaction such as Information Quality and Service Quality, while customers' satisfaction does not impact service quality. The result will impact the strategy and recommendation for hotel industry to focus on important factors. © 2021 Little Lion Scientific
ABSTRACT
Education is a sector that needs to go on to operate countinously as a means of student's activity and development in covid-19 pandemic. Multimedia is the best solution for managing PE class not to stop despite the social distancing issue. The aduance of technology in digitalization era isn't an obstacle to on going learning activities. Advance multimedia facility could surely be able to answer the problem arising in the society related to physical activity carried out as a form of learning. The efectiveness of multimedia learning can be seen from its trancendency to attract student's attention and interest as it combines the views, sound, and movement. So that learning takes place attractively and easily remembered by the students. © Published under licence by IOP Publishing Ltd.