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E-portfolios have increasingly been integrated into higher education to promote reflection, documentation, and learner autonomy; however, their effectiveness in English Language Teaching (ELT) in Indonesia remains insufficiently examined. This study evaluates the use of e-portfolio-based learning in an Evaluation in ELT course by employing the Context, Input, Process, and Product (CIPP) evaluation model. Four research questions guided the investigation, focusing on the relevance of the programme context, the adequacy of inputs, the implementation processes, and the resulting learning outcomes. Using a descriptive qualitative design, data were collected through classroom observations, semi-structured interviews, and documentation of students’ e-portfolios. The participants consisted of one lecturer and thirty-seven seventh-semester students (ten males and twenty-seven females) enrolled in the course during the 2022/2023 academic year; additionally, three students were purposively selected for in-depth interviews. The findings indicate that (1) the context supported the adoption of e-portfolios as it aligned with course needs and learning objectives; (2) the input—including digital facilities, infrastructure, and access to online tools—was adequate for implementation; (3) the process showed active student engagement, although challenges such as connectivity issues, device limitations, and time constraints were present; and (4) the product demonstrated positive learning outcomes, including improved documentation practices, better understanding of course material, and increased digital literacy. The study underscores the potential of e-portfolios to enhance ELT learning and suggests the need for more structured feedback mechanisms and technical support to optimise future implementation.

Stillage or distillery wastewater have been reported as industrial effluent that are difficult to be treated as its discharge in the water bodies presents contamination with recalcitrant and non-degradable pollutants. Due to their complicated structure, stillage treatment process using traditional methods such as adsorption, coagulation, and flocculation is challenging. Fenton reaction has been found as an effective method to degrade these contaminants through hydroxyl radicals. In this study, the removal of pollutants in stillage was investigated using UV-assisted Fenton process. Experiments was conducted for 60 minutes in a batch reactor with initial pH of stillage 4.5, UV lamp of 395-400 nm, and constant speed of 250 rpm, while the dosages of H 2 O 2 and Fe (II) were kept constant at 3.3 g/L and 0.6 g Fe/L, respectively. The profile of chemical oxygen demand (COD) removal, pH, temperature, and oxidation-reduction potential (ORP) was evaluated under three dilution factors of raw stillage (1/10; 1/25; and 1/50) during treatment process to investigate the effects of these parameters on treatment efficiency. It has been observed that initial COD of stillage had considerable effect on the performance of UV-photo-Fenton treatment, as higher dilution factor increases the removal efficiency of COD from stillage. The degradation of COD by UV-assisted Fenton was found to be suitably described by the pseudo-first-order kinetics. The results obtained from this work indicated that UV-Fenton can be introduced as a successful advanced treatment process for efficient degradation of stillage.

Hydrothermal carbonization is a thermochemical process used in converting biomass into a coal-like substance known as hydrochar. This is usually carried out at high temperature with water below the saturation pressure for a certain period known as holding time. The biomass used was soybean dregs, which is the residue obtained from processing soy sauce with low economic value. The aim of this study therefore, was to determine the calorific value of the hydrochar produced from soybean dregs at hydrothermal carbonization temperatures of 160?C, 190?C, and 220?C and at holding times of 30 and 60 minutes, also at a temperature of 190?C with the biomass and water ratio at 1:4 and 1:5. The results showed that the highest calorific value was produced a temperature of 220?C and a holding time of 60 minutes, which was 3.866 kcal/kg, the highest carbon content was 26.49%, the lowest moisture content was at 1.77%, the lowest volatile content was at 62.98%, while the lowest ash content was 8.64%. Considering biomass to water ratio with the holding time, the highest calorific value was at 3.546 kcal/kg, the highest carbon content was 20.32%, the lowest moisture content at 1.71%, the lowest volatile content was 68.58%, while the lowest ash content was at 8.37%. The highest calorific value of the hydrochar produced was similar to the calorific value standard of lignite coal which is around 3511-4611 kcal/kg according to the American standard testing and mineral.

Parangtritis is one of the seashore areas in Indonesia which has a low enthalpy geothermal potential. The possible utilizations suitable to this area is direct use, such as salt production, fish drying, saltwater desalination, and aquaculture. However, the utilization of this energy source is still not optimum yet. Considering the understanding on the technology as a key factor of renewable energy implementation, this paper examines how the geothermal potential and its utilization are understood by university students of Faculty of Mineral and Technology - one of main disciplines in geothermal field - in the Universitas Pembangunan Nasional \"Veteran\" Yogyakarta. In total, 100 respondents filled in the questionnaire. This study suggested the importance of understanding geothermal potential by Faculty of Mineral and Technology students in order to successfully utilize low enthalpy geothermal potential in Parangtritis and generally in Indonesia.

[...]Lim and Lee urged to disseminate information regarding merit and demerit of biofuels to the public by extensive campaigns, promotions and publicity through various mass media and communication channels for public to understand background and purpose of the implementation of biofuels in transportation sector. Since the aforementioned studies revealed that countries with potential renewable energy source are not English-speaking countries whilst most of information resources on renewable energy technology are in English language, it is still required to translate English materials on renewable energy technology into languages other than English in order to provide more access to non-English speaking countries toward renewable energy information. The uncovering of the videos containing hoax, myths and pseudoscience gives urgency to the renewable energy scientists to join education efforts including spreading the information, so that public are liberated from misleading understanding on renewable energy. Since most of the videos mentioned more than one renewable energy source, the distribution of energy sources is depicted as shown in Figure 1. [...]following the people engagement in the comment list of the video may also enrich public knowledge on the renewable energy technology, particularly biomass gasification technology. 4.Conclusions This study indicated YouTube as a potential tool to fulfil lack of information on renewable energy technology.

Waste management contributes to renewable energy such as biodiesel production from processes of various types of biomass including vegetable oils, animal fats, and waste of edible oil. Successful waste management effort is influenced by people concern about benefit of waste management including for renewable energy from biomass. It involves their understanding initiated by literacy on biomass energy. To help increase literacy on waste recycle and biomass energy technology, we study readability of online information regarding biomass energy in Indonesian language ( Bahasa Indonesia ). Indonesia is considered as one of biomass-rich country with a little utilization for energy. The readability is studied by combining two approaches: measurement by readability standard and survey on readability confirming measurement by the standard. This study focuses on the confirmation survey readability standard measured on biomass online information in Indonesian language. In the survey, 19 online text materials were read by respondents and they were asked to give their impression whether the texts are easy or difficult to understand. From this study, what factors influence understandability of text information are shown. The results could be a guidance for preparing text information to raise people concern on waste recycle and renewable energy in general.

Energy is one of the essential human needs that plays a crucial role in achieving sustainable development. Indonesia is among the countries that are highly focused on developing renewable energy to reduce greenhouse gas emissions and achieve net-zero emissions. In addition, the government has launched various policies and programs to promote the use of renewable energy, such as increased investment in biomass, geothermal, and solar power generation. Wind energy stands out as a sufficient, widely available, and an environmentally friendly alternative in renewable energy. In 2021, the Indonesian Energy Outlook highlights that Indonesia has an energy potential of 154.9 gigawatts (GWs). It is associated with minimal emissions of greenhouse gases during its operation and does not demand vast tracts of land. However, the actual installed capacity of wind power plants is at a modest 157.41 megawatts (MWs). Meanwhile, the targeted capacity is 255 MWs for 2025. One significant factor contributing to this lower-than-expected capacity is a lack of in-depth research into the potential of wind energy. Consequently, the primary aim of this paper is to conduct a thorough examination of the wind energy potential in Indonesia. This includes an analysis of the current state of both existing and upcoming power plants, as well as a review of recent studies conducted by Indonesian researchers on wind turbines. Furthermore, this paper explores the government program to encourage the sustainable development of wind power plants. It also explains various aspects including the untapped wind energy potential, the interference in developing wind power plants, and the strategy to harness the full potential of abundant renewable resources in Indonesia. Through an in-depth investigation of the potential of wind energy, this review aims to provide a more comprehensive understanding of the current conditions and prospects of wind power plants in Indonesia as well as contribute to a more accurate mapping of wind energy potential and more targeted development, specifically in remote areas, outer islands, and borders. The results obtained are expected to support Indonesia’s energy transition toward more environmentally friendly and sustainable renewable energy sources, thereby reducing dependence on fossil fuels.

E-portfolios have increasingly been integrated into higher education to promote reflection, documentation, and learner autonomy; however, their effectiveness in English Language Teaching (ELT) in Indonesia remains insufficiently examined. This study evaluates the use of e-portfolio-based learning in an Evaluation in ELT course by employing the Context, Input, Process, and Product (CIPP) evaluation model. Four research questions guided the investigation, focusing on the relevance of the programme context, the adequacy of inputs, the implementation processes, and the resulting learning outcomes. Using a descriptive qualitative design, data were collected through classroom observations, semi-structured interviews, and documentation of students’ e-portfolios. The participants consisted of one lecturer and thirty-seven seventh-semester students (ten males and twenty-seven females) enrolled in the course during the 2022/2023 academic year; additionally, three students were purposively selected for in-depth interviews. The findings indicate that (1) the context supported the adoption of e-portfolios as it aligned with course needs and learning objectives; (2) the input—including digital facilities, infrastructure, and access to online tools—was adequate for implementation; (3) the process showed active student engagement, although challenges such as connectivity issues, device limitations, and time constraints were present; and (4) the product demonstrated positive learning outcomes, including improved documentation practices, better understanding of course material, and increased digital literacy. The study underscores the potential of e-portfolios to enhance ELT learning and suggests the need for more structured feedback mechanisms and technical support to optimise future implementation.

Organic Rankine Cycle is a technology that convert low-temperature heat sources into a mechanical energy, and it can be used to produce electrical energy in a closed system. The heat sources can be received from renewable energy such as geothermal, solar, and biomass. Furthermore, the ORC system can also be used to increase energy efficiency in the industry by utilizing the waste heat produced. Therefore, there are two classification of the ORC system, namely a heat recovery system and binary power plant. Recently, the ORC system has made a thrive in the geothermal power plant. The ORC system can be applied to resources with low to medium temperature characteristics (<90°C - 150°C). This paper will present an overview of the implementation, model, and innovation of ORC system technology in geothermal resources.