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The Use of Regression Method on Simple E for Estimating Electrical Energy Consumption
Get PDFThe continuous increase in population growth has an impact on the electrical energy supply. Based on this increase, electric power producers serve customers using proper forecasts. Therefore, it is a necessity to select the right calculation method with easy implementation. In this study, the population forecasts and economic growth calculations using the GT (Growth Trend) regression method development on Simple E were obtained for the year 2028. Furthermore, electricity consumption estimation was carried out using the DL (Double Log) regression method with growth trend, R, AR, DW, and t values of 6.63%, 0.993, 0.992, 1.21, and 2.18, respectively. The results show that estimated energy consumption was 6.63% annually, with the achievable amount for 2028 being 19,839.83 GWh. Doi: 10.28991/HIJ-SP2022-03-06 Full Text: PD
An Investigating of the Impact of Bed Flume Discordance on the Weir-Gate Hydraulic Structure
Get PDFDiscordance and concordance play a significant role in the hydraulic response for the flume, open channel, hydraulic structure, and flow field measurement. Bed discordance and bed concordance are regarded as common problems in open channels. Discordance is the dominant one, which could have an effect on the hydraulic structure that is constructed inside the channel. This paper deals with the impact of bed flume discordance on hydraulic flow characteristics at the weir-gate downstream hydraulic regime. Four configurations with different lengths and heights of the bed flume discordance are adopted here to investigate the impact of these configurations on the hydraulic characteristics. In addition, one configuration of the bed flume concordance is adopted to compare with the other four configurations. At downstream, the average water depth becomes dimensionless by dividing by upstream water depth, vertical distance between weir and gate, length of downstream, length of concordance, and length of discordance in order to evaluate the inequality in the distribution of Froude number. On one hand, certain results appear strongly between Reynolds number and Froude number at downstream, actual discharge and flow velocity at downstream, flow area past the gate and Froude number at downstream. On the other hand, there was a complex dramatic relation between the weir-gate discharge coefficient and Froude number at downstream. Overall, the study shows that there is a good relationship between specific energy, water depth, and flow speed. Doi: 10.28991/HIJ-2022-03-03-09 Full Text: PD
Innovation for People with Disabilities in Hospitality Industry: A Theoretical Approach
Get PDFHotels are forms of businesses connected to the entire system of production and distribution of tourist products. Essentially, they provide hospitality goods and services to travelers, individuals with different profiles and interests, and thus play a very important role in the tourism sector. Therefore, the purpose of the article is to point out the theoretical approach of innovation in the context of its utilization in hotels for individuals with disabilities. We have reviewed the existing theoretical approaches to innovation and then analyzed their applicability in the tourism sector. Based on the findings, we developed theoretical approaches, such as the coupling theory and the innovation diffusion theory, that can be applied to the target sectors and provide valuable insights to the relevant actors. Research shows that innovation, whether it concerns technological applications or processes, affects the enrichment of hotel services provided for people with disabilities and influences the technical-functional and organizational processes of hospitality. On this basis, innovation is a key factor of growth for any hotel, as it increases its competitiveness and sustainability through the utilization of the potential provided by the use of new innovative technological applications or processes for people with disabilities.JEL Classification: L83, O30. Doi: 10.28991/HIJ-2022-03-01-010 Full Text: PD
Development of Starter Culture for the Improvement in the Quality of Ogiri, a Food Condiment
Get PDFThe objective of the present study was to isolate Lactic Acid Bacteria (LAB) from ogiri, a Nigerian fermented vegetable product, with the primary focus of selecting suitable isolates as candidates for starter cultures for use in possible improvements in the quality of the product. LAB was isolated from ogiri using phenotypic methods and then subjected to technological tests to evaluate its suitability as a starter culture. Based on their considerable technological properties, two isolates of LAB were selected as candidates for starter cultures. The starter cultures were inoculated at 103 CFU/g during the production of ogiri, while un-inoculated samples served as a control. The ogiri samples were stored for nine days, within which samples were taken for microbial and proximate analyses. Four LAB isolates were isolated and identified phenotypically from ogiri procured from a commercial market, including Lactobacillus acidophilus, Lactobacillus fermentum, Enterococcus sp. and Lactobacillus plantarum. The species of Lactobacillus displayed the usual cell shapes of rods when examined under the microscope, which is typical of most members of the genus. The cells of the Enterococcus sp. were, however, cocci in shape, and this is also typical of members of the genus. The basis of the identification of the LAB isolates was their ability to utilize a wide range of carbon sources in their physiological and biochemical activities. Among the LAB isolates, L. acidophilus, L. fermentum produced less than 0.35 and 0.024 mg/l of acetic acid and hydrogen peroxide, respectively, and were therefore chosen as starter cultures for the production of ogiri. Inoculated ogiri samples showed reduced counts of coliforms, yeast, and moulds in comparison with their un-inoculated counterparts during storage. Coliform counts increased beyond 105 CFU/g in the un-inoculated control samples, whereas counts were lower in samples inoculated with L. acidophilus and L. fermentum. Yeast and mould count of 8.1 106 CFU/g was recorded as the highest value in the un-inoculated control samples, but the count was generally below 106 CFU/g in the starter culture inoculated samples. Inoculation with LAB did not have significant difference (p > 0.05) in the proximate compositions of the fermented product. The LAB cultures L. acidophilus and L. fermentum demonstrated considerable control of coliforms and fungi in ogiri. Storage of the fermented product should not exceed 5 days for safety concerns, as an increase in counts of coliforms was recorded beyond this period. No significant difference (p > 0.05) was recorded in the proximate compositions of starter culture inoculated ogiriand un-inoculated samples. Doi: 10.28991/HIJ-2022-03-01-04 Full Text: PD
Characterization of Structural Transition and Heterogeneity under Compression for Liquid Al2O3 Using Molecular Dynamics Simulation
Get PDFWe have performed a simulation of the structural transition and Structural Heterogeneity (SH) in liquid Al2O3 at 3500 K, in the range of 0–100 GPa. The results confirmed that the network structure of liquid alumina is built mainly from AlOx (x = 3, 4, 5, 6, 7) units, which are related to each other through the common oxygen atoms. The existence of separate AlO3-, AlO4-, AlO5-, AlO6- and AlO7- phases, where SH of the network structure can be sufficiently determined, besides, the existence of separate phases is clarified for SH in the liquid of Al2O3. In particular, at a pressure below 10 and beyond 20 GPa, AlOx units are uniformly distributed in the space and non-uniformly distributed in the range 10-20 GPa. Our study is expected to contribute to a simple way to determine the structural heterogeneity and diffusion coefficients of oxide systems. Doi: 10.28991/HIJ-2022-03-02-08 Full Text: PD
Temporal Trends of Rainfall and Temperature over Two Sub-Divisions of Western Ghats
Get PDFRainfall, along with temperature, is the major component of the hydrological cycle, and its spatiotemporal variability is essential from both scientific and practical perspectives. Due to the recent rise in temperatures all over the world, there are quite a number of conflicting trends in inter-annual variability in monsoon rainfall and temperature over the Western Ghats. The Western Ghats, next to the Himalayas, are the major watershed for the major south Indian rivers. In this study, an attempt has been made to understand the monthly, inter-seasonal, and inter-annual trends of rainfall and temperature over the two meteorological sub-divisions, namely Konkan Goa, and Coastal Karnataka. Monthly rainfall data for the period of 1977 to 2016 and temperature data from 1980 to 2016 are used. According to the analysis, maximum rainfall occurs during the summer, whereas the least rainfall occurs during the winter. The parametric, linear regression analysis and student t-test have been used to identify the existence of trends and to determine the changes in rainfall over the time period. An effort has been made to understand the relationship between ISMR (Indian Summer Monsoon Rainfall) and the ENSO phenomenon and to investigate whether the rainfall over WG is influenced by the ENSO phenomenon or not. Results reveal that although there is increased rainfall over Konkan and Goa, while declining over coastal Karnataka, the changes over both the sub-divisions were statistically significant. Considering rainfall in different seasons, there is a significant change during the monsoon season only. The study further reveals that there is increasing rainfall over Konkan and Goa and decreasing rainfall over Coastal Karnataka. Furthermore, no statistically significant trend (positive or negative) was evident in any of the seasons. All temperature trends were positive. The results of this study may prove useful in the preparation of climate change mitigation and adaptation strategies by understanding the patterns of rainfall over WG. Doi: 10.28991/HIJ-SP2022-03-03 Full Text: PD
Evaluation of Hybrid Learning in the University: A Case Study Approach
Get PDFHybrid learning is a type of educational system in which some students attend class in person while others engage virtually from home. Hybrid learning has been applied in all educational institutions since the pandemic. BINUS University used a Learning Management System called Binusmaya to support teaching and learning activities for both hybrid and fully online learning. The objective of this study is to assess the effectiveness of hybrid learning at BINUS University based on student performance academically and non-academically. It focuses on students from the 2019–2020 academic year. The survey obtained 200 replies using a quantitative technique and a Google form as the media questionnaire. Previous research has shown that hybrid learning provides effective results in terms of academic achievement. Compared to this study, few criteria are used to measure the effectiveness of hybrid learning, such as environment, knowledge, and skills. In addition, we have added the comparison between hybrid learning and the full online method at BINUS University. The results indicate that hybrid learning is ineffective compared to fully online learning. Furthermore, hybrid students were dissatisfied with their overall results, and students pursuing full-time online courses outperformed hybrid students. This study also provides some approaches to increasing the effectiveness of hybrid learning at BINUS University. Doi: 10.28991/HIJ-2022-03-04-03 Full Text: PD
Analysis of the Management Positions Gender Structure in Sports Organizations in Slovakia
Get PDFThe aim of the presented paper is to capture the gender aspects of sports culture through the gender structure of Slovakia's national sports organizations members and their management positions. In order to fulfill the aim of the paper, a hierarchical cluster analysis was applied using IBM SPSS Statistics. As a part of this analysis, due to the cardinality of the input variables, the Euclidean distance measurement method and the Ward method were used. The results of the research examining 65 national sports organizations in Slovakia confirmed that the gender in Slovak organized sports is manifested on the one hand by the dominance of men in the membership of sports organizations, with the exception of sports those are explicitly understood as female, but also in the representation on the management and decision-making positions. Furthermore, we managed to find out that there is a relationship between the gender structure of the membership base and the gender structure in management and decision-making positions, which is reciprocal and at the same time asymmetrical. Doi: 10.28991/HIJ-2022-03-04-04 Full Text: PD
3D Numerical Modeling to Evaluate the Thermal Performance of Single and Double U-tube Ground-coupled Heat Pump
Get PDFThe heat transfer rate and borehole design represent great challenges to the thermal equipment designer of the ground-coupled heat pump. The present model represents a mathematical and numerical technique implemented to tackle such a problem. A thermal assessment was established to estimate the total energy dissipated to the ground zone for a heat pump utilized for cooling purposes in the summer season. Comsol Multiphysics 5.4 software was used to build a 3-dimensional model to assess the thermal performance of single and double U-tube boreholes that circulate water as a thermal transfer medium. The (Heat Transfer) module has been implemented for this investigation under the (Stationary) study option. The model couples both heat conduction in solids, including tube metal, grout, and soil regions, and thermal medium fluid flow inside the U-tubes. The numerical solutions were compared for both heat exchangers at fixed borehole geometry, diameter, and depth and constant operating conditions in a steady-state mode. The double U-tube heat exchanger was tested in the parallel circuiting orientation of the U-tubes. The total mean resistance of the single U-tube borehole was higher than the half-loading double U-tube heat exchangers by 14.6%. The results also revealed that the heat transfer rate enhancement for the double U-tube was in the range of 10–14% when operating at the same fluid mass flow rate and inlet temperature for a given borehole design. Doi: 10.28991/HIJ-2022-03-02-01 Full Text: PD
Are Activation Teaching Methods Really Effective?
Get PDFThe primary aim of the presented paper is to demonstrate the effectiveness of activation teaching methods in the teaching of technical subjects at secondary vocational schools through pedagogical research using a pedagogical experiment. The effectiveness of the activation teaching methods is demonstrated in the Integrated Rescue System subject taught in the field of Security and Legal Activity. The object of the research are pupils who were 2nd year pupils in the 2019/2020 school year, as well as teachers of the analyzed subject. The pedagogical experiment was carried out in three consecutive years, namely in the school years 2019/2020, 2020/2021 and 2021/2022. The presented paper has the classic structure of a scientific work; it is divided into a theoretical and an analytical part. We processed the theoretical part of the work using secondary analysis. Pedagogical research was used in the analytical part of the work. Both qualitative and quantitative pedagogical research were used. Qualitative pedagogical research was carried out using a semi-structured interview with open questions. Observation was also used. The quantitative part of the pedagogical research was carried out using a standardized questionnaire. Another method of quantitative pedagogical research was the pedagogical experiment, i.e., its implementation led to obtaining outputs of a quantitative nature. When evaluating the results of pedagogical research of a quantitative nature, we used mathematical-statistical methods for our chosen variables, which were not only processed, but also analyzed through the statistical program SPSS Statistics 22.0. We proved through a pedagogical experiment of a longitudinal nature that activation teaching methods are really effective in teaching technical subjects at secondary vocational schools, while within the framework of that pedagogical experiment it was proved that it is possible to apply activation teaching methods very effectively in the so-called flipped classroom model, which we present as suitable for effective activation teaching of secondary school pupils. Doi: 10.28991/HIJ-2022-03-04-06 Full Text: PD