The purpose of this research was to extract tea leaf phenols using Microwave Assisted Extraction (MAE) method at 3 levels of microwave power (high, medium high and medium) and investigated the influence of physco chemical properties of whey protein and gelatine biopolymer using tea leaf extract as crosslink materials at different concentration (5%, 10% and 15% (v/v)). MAE method gave significantly effect on phenolic content. High level power of MAE gave higher phenolic content of tea leaves extracts. Tea leaves extracts as crosslinked agent of biopolymer gave highly significant effect on the stability of the emulsion, the emulsion activity and foaming power. SDS-PAGE protein profile showed increase molecular weight with the addition of tea leaf extract, it can be presumed presence crosslinked both on whey protein or gelatine.
<em>This study aims to describe and explain the form of language errors in the field<strong> </strong>of phonology, morphology, and syntax in the exposition essay of the student of X MIPA SMA N 4 Surakarta and describe the causes of language errors and efforts that can be done by teachers and students so that the Indonesian language error in the exposition essay by the students of X MIPA SMA N 4 Surakarta can be minimized. The research uses qualitative method with case study type. Research data in the form of Indonesian language error obtained through the exposition essay by the student of X MIPA and the data source used are documents and informants. Data collection technique conducted through observation, interviews, dan test. Data validity test used is triangulation method, informant review, dan intrarater. The result of this research are description of: (1) forms of language errors in the phonological field include capitalization misuse, misuse of punctuation, particle error, rewrite error, typographic error, and typing error; (2) the form of language error in the morphological field include mistakes of preposition, mistake of word formation, and error of pleonasm; (3) the form of language error in the syntax field include the phrase structure dan sentence structure; and (4) the factors causing the Indonesian language error not only comes from the students but also because of teacher and efforts that can be done to minimize language errors.</em>
The main safety parameters of Multipurpose Reactor–Gerrit Augustinus Siwabessy (RSG-GAS) have never been evaluated periodically and neutronically require to be evaluated in terms of stuck rod reactivity, shut-down margin and temperature reactivity coefficient are treated by experiment. Meanwhile, power peaking factors and maximum fuel burn up are treated by calculations. The diffusion method did the calculation using the computer code. Safety parameters are very important aspects for the operation and design improvement. The results of the experiment and calculation about the safety parameters of RGS-GAS core are utilized for safety evaluation as part of a research reactor operation Periodic Safety Review (PSR). It presents reactor calculations as a method for their determination assuming use of computer codes such as WIMSD-5B using ENDF.BVII.0 and BATAN-FUEL. According to the experimental data and calculation, neutronic safety parameters have met the safety analysis report such as reactivity coefficient is negative and met the shutdown margin at stuck rod condition nothing has violated the safety margin. The results can be used as the periodic safety review for renewal operation license from Nuclear Energy Regulatory Agency of Indonesia (BAPETEN) as the regulator body. These results also can be used as a reference for new research reactor MTR type advanced design in the future.
<p style="text-align: justify;">The Coronavirus disease (COVID-19) pandemic impacted various lines in the international world, including Indonesia. Pandemic COVID-19 in Indonesia has also changed multiple performances in multiple sectors, one of which is education. The concept of learning from home changes lecturers' paradigm as educators in tertiary institutions applying online learning. This study aims to identify students' perceptions of the implementation of online learning during the COVID-19 pandemic. This study uses a qualitative research approach with the type of phenomenology. The subject of this study was 22 students in Indonesia who experienced the impact of the COVID-19 pandemic. This research instrument uses semi-structured interview guidelines. Students perceive online learning during the COVID-19 pandemic as (1) ineffective learning activities; (2) unpleasant learning activities; (3) limit self-actualization in education; (4) helping to become an independent person in learning; and (5) fun learning activities. Higher Education should create innovative and creative online learning strategies. Thus, students have a high enthusiasm for online learning.</p>
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