Universitas Pendidikan Indonesia
  • Bandung, Jawa Barat, Indonesia
Recent publications
COVID-19 pandemic gives a very significant impact on many aspects of life in a global scale. In Indonesia, as in many countries in the world, public activities involving many people are restricted and regulated to prevent the virus’ broader spread. Technology which still enables activities to be conducted individually and remotely is needed, because during the pandemic, they can only be done very limitedly, if not stopped. Therefore, people are utilizing telecommunications to assist activities during the COVID-19 pandemic. Several innovations involving telecommunication technology are applied, e.g., distance learning (e-learning), online business (e-commerce), and digital health services (e-health). However, there are many challenges in using telecommunication technology during a pandemic in developing countries, especially in Indonesia. This article examines (1) the role of telecommunication technology in education, economy, and health sectors, (2) the challenges, and (3) how telecommunication technology as the solution can be more effective in future. This article provides an outlook and in-depth overview of how the impact of recent technology, especially telecommunication, played a vital role in the three crucial sectors in mid-low countries like Indonesia during the COVID-19 outbreak.
While research exists on literacy focused on children in formal school, there is little evidence of how adult literacy is depicted in social practice from the perspective of what adults do in daily life. This study investigates the effectiveness of literacy teaching design integrating local culture discourse and practice to enhance the reading skills of adults in Indonesia. One hundred participants from underdeveloped areas aged 25–50 contributed to the learning process for twelve lesson units. We elicited data by using two instruments, namely multiple-choice questions and interviews. The statistical analysis showed that instructional design profoundly affected the improvement of reading skills. The thematic analysis showed how participants evaluated the literacy teaching design as enriching knowledge, sharing understanding among participants and motivating them to improve their life skills. This study will be useful to teachers who are seeking cognitive and practical instructions to promote reading skills in the classroom.
This study aims to determine the relationship between religiosity, moral reasoning, and internalization of pure values as the mediator of prosocial behaviour among students in Banda Aceh, Indonesia. The Secondary Islamic Education Internalization Scale (SPPIP-M), Behaviour Reasoning Scheme Indicator (UPSTA), and Prosocial Tendencies Measure (PTM) scale were used to measure the religiosity, moral reasoning, and internalization of pure values prosocial behaviour of students. The result showed a link between religiosity, moral reasoning, and internalization of pure values with prosocial behaviour of secondary school students in Banda Aceh.
The world's energy consumption shows an increasing trend. Unfortunately, it is still dominated by the use of fossil energy. This condition results in concerns that an energy crisis will occur due to running out of non-renewable energy and an environmental crisis of global warming. One of the technology sectors that consumes a lot of energy is computer servers and data centers. This technology sector is growing rapidly due to the increasingly complex computing and larger data. One of the main causes of inefficiency in this technology is a decrease in performance due to an increase in temperature. Therefore, effective and efficient technology is needed to overcome the increasing operating temperature of computer servers and data centers. One of the most prominent cooling technologies to solve this problem is immersion colling. This method has developed in various types with their respective advantages and disadvantages according to application needs. Therefore, review literature is needed to comprehensively discuss the development of immersion cooling technology from the past until now and projected developments in the future. In more detail, this paper comprehensively compiles the latest findings of immersion cooling technology which includes an overview of the cooling system, history, implementation, construction type, and advantages. Ó 2022 THE AUTHORS. Published by Elsevier BV on behalf of Faculty of Engineering, Alexandria University This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).
The outbreaks of infectious diseases that spread across countries have generally existed for centuries. An example is the occurrence of the COVID-19 pandemic in 2020, which led to the loss of lives and economic depreciation. One of the essential ways of handling the spread of viruses is the discovery and administration of vaccines. However, the major challenges of vaccination programs are associated with the vaccine cold chain management and cold storage facilities. This paper discusses how vaccine cold chain management and cold storage technology can address the challenges of vaccination programs. Specifically, it examines different systems for preserving vaccines in either liquid or frozen form to help ensure that they are not damaged during distribution from manufacturing facilities. Furthermore, A vaccine is likely to provide very low efficacy when it is not properly stored. According to preliminary studies, the inability to store vaccine properly is partly due to the incompetency of many stakeholders, especially in technical matters. The novelty of this study is to thoroughly explore cold storage technology for a faster and more comprehensive vaccine distribution hence it is expected to be one of the reference and inspiration for stakeholders.
An experimental study of pyrolysis from polyethylene (PE) and polypropylene (PP) has been done by catalytic method and utilization of low-cost natural zeolite in a semi-batch reactor. A low-cost natural zeolite made from acid-treated zeolite with 1 M HCl solution was denoted as HZ. The prepared HZ catalyst was then carried out under pyrolysis reaction at 350, 400, 450 °C for 60 min. The chemical products composition from this reaction was analyzed using Gas Chromatography-Mass Spectrometry (GC–MS). According to the analysis result, a low-temperature reaction of pyrolysis could produce wax in all variant types of feed. Utilization of HZ catalyst could reduce formation wax while also increasing the yield of oil products after the reaction. Catalytic pyrolysis using HZ for PE and PP plastic feed yields oil products up to 67% and 70%, respectively. The composition of oil products mainly consisted of paraffin, olefin, and alcohol compounds. The temperature optimum for the catalytic reaction could produce the highest paraffin and olefin products at 400 °C. Additionally, utilization of low-cost natural zeolite could improve pyrolysis reaction's performance from PP to produce yield olefin products from 39 to 62%. Graphical Abstract
Citizenship Education is currently interpreted as a multidimensional education, even Citizenship Education includes various disciplines related to citizenship issues. One of the actual citizenship problems is about environmental damage, because it is a problem experienced by all nations in the world. This study aimed to develop an instrument to measure students’ attitudes related to students’ ecological citizenship behavior as one of the outputs of Citizenship Education course in middle school. This study was using development method (R&D) which included several stages, namely preliminary research, development research, effectiveness measurement, and dissemination. The results of the expert assessment of the content and content validation test stated that the digital citizenship-based political participation instrument was assessed according to the CVI 1 (Relevant) value, while the broad-scale analysis of the questionnaire items was obtained with valid results of 26 questionnaire items with reliability value of 0.98. This study found that the instrument was relevant to measure civics learning outcomes in the form of students’ ability to apply attitudes in accordance with the value of ecological citizenship.
Prospective mathematics teachers’ students must be able to build didactic situations that encourage students to actively learn. They must also be able to develop lesson plans independently. The facts found include lesson plans in the form of drill activities and the activity of downloading lesson plans from the Internet rather than compiling the lesson plans themselves, which are problems that need to be resolved. This study aims to analyse the learning obstacles experienced by prospective mathematics teacher students in preparing lesson plans. This research was a qualitative didactic design research with a focus on the analysis of didactic and metadidactic situations. The research subjects were three easily accessible prospective teachers, lecture administrators, lecturers from certain courses, and program administrators. Lecturers were chosen through the snowball method. The analysis of prospective teachers learning obstacles was conducted by analysing their actions, formulations, and validations during courses on curriculum analysis, media, and microteaching. The results showed that there were (1) ontogenic obstacles, namely, the readiness of students to attend lectures; (2) didactic obstacles, namely, imperfect learning materials and SLPs (semester lecture plans) that did not include elaborating and studying basic competence as indicators; and (3) epistemological obstacles, namely, the lack of opportunities for students to practise in the field, confirm, and validate the work they had produced with practitioners (i.e., school mathematics teachers). The results showed that there were ontogenic obstacles to student readiness, a didactic obstacle to learning materials used in lectures, and epistemological obstacles to the absence of interaction with schoolteachers. After knowing the learning obstacle of mathematics learning planning lectures, this research has implications for the development of lecture designs that encourage students to produce lesson plans. The lesson plans produced by students make school students learn actively.
Study purpose. This study aimed to evaluate the effect of a tactical game model program on improving formation of basic techniques in male handball players. Materials and methods. This study adopted a mixed method (quantitative and qualitative). 20 students from Indonesian education universities were willing to be the subjects of this study. The experimental group (n=10) received treatment, namely the tactical game model program, and the control group (n=10) carried out daily training activities or did not receive any program. The tactical game model program was held 16 times with once a week meetings. After the tactical game model program was completed, 10 athletes were interviewed. The quantitative instrument in this study used a test for shooting, passing and dribbling. Meanwhile, the instrument for qualitative research used in-depth interviews about the experiences, strengths and weaknesses of the tactical game model program. Analysis of quantitative data was carried out using IBM SPSS, and analysis of qualitative data was carried out using thematic analysis. Results. The results of this quantitative study showed that there was a significant effect of tactical game models on improving the formation of basic techniques in male handball players (p0.05). Meanwhile, the results of qualitative research showed that the subjects provided positive and diverse perceptions about the tactical game model program. Conclusions. This study confirms that the tactical game models program has proven to be an alternative teaching method for lecturers at the university level to improve the formation of basic techniques in male handball players.
The paper aims to expound on the comprehensive experimental investigation of the stability of TiO2-Polyolester (POE) nanolubricant. A magnetic stirrer was used to disperse TiO2 nanopowder into POE lubricant for 30 min. The six samples were then subjected to various ultrasonication treatments lasting 40-, 60-, 80-, 100-, and 120-min. Stability analysis was performed in three stages: visual observation, Ultra Violet (UV) visible spectrophotometric analysis, and measurement of the absolute zeta potential. The results showed that sample without ultrasonication treatment had substantial agglomeration as compared to other samples. The absorbance ratio of the sample without ultrasonication treatment is 0.33. The absorbance ratio value escalated as the duration of the ultrasonication treatment on the sample increases. After ultrasonication treatment for 40–120 min, the absorbance ratio increased by 34–117%. The samples treated with 120 min of ultrasonication showed the highest level of stability, as evidenced by the high absorbance ratio and zeta potential values of 0.95 and −80.48 mV, respectively. As a result, the findings suggests that TiO2-POE with ultrasonication treatment for 120 min could generate the excellent stability compared to other samples in this experiment.KeywordsTiO2-POE nanolubricant stabilityInterlude ultrasonicationUV visible spectrophotometryZeta potential
Errors in the UV visible spectrophotometry analysis’ selection of spectral peaks can lead to errors in the nanolubricant stability analysis. Despite the fact that the spectral peak results are compared at the same peak, it is critical to identify the correct spectral to avoid errors in the nanolubricant stability analysis results. In this study, one factor at a time (OFAT) based on surface response was adopted to determine the effect of wavelength selection on the absorbance ratio of TiO2-POE nanolubricant. The TiO2-POE sample was prepared using a two-steps approach. The sample was ultrasonicated for 100 min using a homogenizer. UV visible spectrophotometry analysis was performed on day 1 and 15 to determine the absorbance ratio. Sixteen runs were performed using a quadratic design to acquire experimental data were fitted. The ANOVA analysis discovered that the experimental statistics were well suited to the polynomial model, with an R2 value of 0.9970 and a model F-value of 2154.24. The findings suggest that the optimum wavelength is 500 nm with an absorbance value of 0.901239 and a desirability level of 1.0.KeywordsANOVAOFATTiO2-POE nanolubricantUV visible spectrophotometry
Investigations of the frequency and vibration levels of the internal combustion engine have been intensively carried out to minimize and make the driver comfortable. This experiment was mostly done by changing engine materials and also testing various suitable fuels. In the last few decades, the analysis of the frequency of internal combustion engines has been carried out by making mixtures of alcohol fuels and fuel additives. The purpose of this work is specifically to analyze the frequency level comparison in an internal combustion engine using a petroleum-methanol fuel mixture (G95%-M5% and G100). The experiment in this test was tested five times with engine speed (1000 rpm, 15,000, 2000, 2500, and 3000 rpm). The test results show that the mixed fuel can produce a lower combustion frequency. However, the burning speed is slightly slower than that of pure petroleum fuels. While pure petroleum fuel has a burning speed so that the level of vibration frequency produced is slightly high. Overall shows that the fuel mixture applied in this work can reduce the level of vibration frequency in the internal combustion engine.KeywordsLever of frequencyCombustionFuel blendG95-M5Gasoline
Neutron flux distribution is an essential parameter in the neutronic analysis of the neutron transport in the nuclear reactor. The multi-group diffusion method is the approach commonly used to solve the neutron transport equation. Based on reactor types, the neutron energy range is classified into two regions, namely fast and thermal energy regions. This study presents the neutron flux distribution in the thermal region of the slab reactor core using a one-dimensional multi-group diffusion equation with the Gauss-Seidel iteration method. The reactor is designed in the form of a fast reactor, and it uses the macroscopic cross-sections of the calculation results in the U-PuN fuel cell level as initial input for 70 energy groups. The library data used is JFS-3-J33 70 energy groups, which is the library data of SLAROM computer codes from JAEA Japan. The computational program calculates the neutron flux distribution only in the thermal group of energy: The calculation of neutron flux distributions is executed using the Gauss-Seidel iteration method. The results indicated that the increase of group energy does not reflect the order of magnitude of a multi-group neutron flux distribution in the thermal region. In the case of neutron interaction with U-235 and Pu-239 nuclide, the pattern of neutron flux distribution for each energy group is not sequential, because both are fissile material. Contrary to the U-238 isotope, almost all group energies coincide with one another in the thermal region. The phenomenon occurs because of U-238 is a fertile material that cannot be directly fissioned.
Mathematical concepts emerge from a hierarchical network of interrelated structures. Matrices and vectors are two separate topics in the Indonesian high school mathematics curriculum (ages 16-18). Meanwhile, matrices and vectors are conceptual entities linked in linear algebra. This qualitative interpretive research aims to gain an understanding of the perception of pre-service and in-service mathematics teachers on the mathematical link between matrices and vectors. We did two rounds of data collection. The first round of data collection used the written open question technique and included 60 pre-service mathematics teachers (PMT) and 24 in-service mathematics teachers (IMT). The second round used in-depth interviews on samples of PMT and IMT. Our findings show that both PMT and IMT have a perception of the mathematical link between matrices and vectors in three categories: on representation, on operation, and no link at all. Furthermore, our investigation shows that the PMT have perceptions that are established by the previous learning experiences in high school. Meanwhile, curriculum tasks considerably influence IMT's perception of the mathematical link between matrices and vectors. More study is needed to build a model of teachers' professional development that is thoroughly aligned with school mathematics and university mathematics from both a didactic and pedagogy standpoint.
A good understanding of rational numbers is the foundation in developing numerical, arithmetic, algebraic even to build proportional reasoning and support success in various professions. However, various evidence shows that rational numbers are still the most challenging in learning mathematics, including PSETs. The learning process that progressively introduces "objects" such as fractions, decimals, percentages, without much accompanied by adequate motivation or explanation, is allegedly one of the causes of the difficulties experienced by students in this topic. This study discusses how understanding and knowledge of rational numbers can be developed for pre-service elementary teachers (PSETs) through diverse contexts in everyday life. Realistic Mathematics Education provides a framework that guides the implementation of those contexts in learning. The theory of didactical situation (TDS), on the other hand, is employed as a framework in analyzing the development of or implementation of the rational numbers' didactical design. Therefore, this study provides mathematics educators with a hypothetical learning trajectory as a platform that facilitates a Realistic Mathematics Education approach for teaching rational numbers, significantly to develop mathematical literacy
Education for children with special needs, especially with mild intellectual disabilities, has not received much attention from researchers and practitioners. The education of intellectual disabilities children also has the same right to develop according to the needs of the times as regular children's education in general. The changing and evolving needs of the times should also be followed by changes in the curriculum used, considering that one of the learning goals in special schools for intellectual disabilities children is to make the children who can live independently. In special schools for intellectual disabilities children in Indonesia, mathematics learning is combined with other lessons to discuss specific themes in everyday life. Based on an extensive literature search on the mathematics curriculum in special schools for intellectual disabilities children, this paper aims to review the literature involving two things: (1) mathematics education curriculum in special schools for intellectual disabilities children in Indonesia, and (2) mathematics curriculum in special education in Australia and Singapore. A view is also provided. This paper concludes that: (1) learning in special schools for intellectual disabilities children in Indonesia uses thematic learning where mathematics learning is focused on its usefulness in everyday life, (2) numeracy is the focus of education in Australia, not least for intellectual disabilities children, and learning Mathematics for mild intellectual disabilities children in Singapore includes the concepts of numbers, spaces, arithmetic procedures, problem solving and measurement.
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Ida Hamidah
  • Department of Mechanical Engineering
Topik Hidayat
  • Department of Biology Education
Beta Paramita
  • Department of Architectural Engineering
Ega Berman
  • Department of Mechanical Engineering Education
Adi Rahmat
  • Department of Biology Education
Information
Address
Jl. Dr. Setiabudhi No. 229 Bandung, 40154, Bandung, Jawa Barat, Indonesia
Head of institution
Prof. Dr. H. R. Asep Kadarohman, M.Si.
Website
www.upi.edu
Phone
+62-22-2013161-2013162-2013163-2013164
Fax
+62-22-2013651