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This research is aimed at developing online learning materials using Google Classroom (GC) to increase teaching effectiveness and improve student achievement in biology. This research was carried out with Research and Development (R & D) design with ADDIE model consisting of four steps: Analysis, design, development, implementation, dan evaluation. First, we (researchers, teachers, and students) develop learning materials using Google Classroom. The materials, including texts, links, and videos, were reviewed by experts to get content validity. A questionnaire with Likert's Scale was used to measure the content validity. The valid learning materials were tried out in a school to know the usability of the GC. A questionnaire with Likert's Scale was used to measure the usability of the Google Classroom. Then, the Google Classroom were implemented in six classes from six high schools with a pretest-posttest control group design. Tests were administered to measure students' achievement on the learning materials. The results indicated that (1) the learning materials were valid based on the expert judgment, (2) the Google Classroom was considered easy to use according to the teachers and the students, specifically to organize the materials, to do video conference using google meet, and to do online assessment, and (3) the Google Classroom was effective to improve the students' achievement in biology. Therefore, it is concluded that the Google Classroom learning materials is feasible to perform online learning in biology. [ABSTRACT FROM AUTHOR]

Briquette is one of the renewable energy fuels derived from the dry leaves of Tectona grandis. This study used dry Tectona grandis obtained directly from leaves that have fallen and become waste. Tectona grandis leaves have an average moisture content of 7.8% (according to ASTM E1871-82). The samples were ground to obtain particles with an average size of 2.5 mm. The design of the carbonizing device and the briquette press was developed by the researcher. The results of this study found that the briquette formulation affected the time and the amount of heat produced. Tectona grandis leaf briquettes can be used as an alternative fuel source that is environmentally friendly because it has high efficiency and produces a large amount of heat. [ABSTRACT FROM AUTHOR]

This study aims to modify the online learning self-efficacy scale (OLSES) developed by Zimmerman and Kulikowich (2016) and apply it to see the self-efficacy profile of students of the Department of Biology Education, Yogyakarta State University in online learning during the Covid-19 pandemic. This research approach is quantitative with a survey method conducted by giving OLSES questionnaires to 84 students from the Department of Biology Education. The OLSES instrument consists of 19 valid questions (Pearson Product Moment value of all items >.215; p <.05) and reliable (Cronbach's Alpha value.902) to be used as a self-efficacy scale in online learning. The results showed that 1 item had a median value of 3, item about the use of online libraries, but the other median items were 4 and 5, that is indicating a high self-efficacy profile of students majoring in biology education. Inferential analysis shows that students' self-efficacy online learning during the Covid-19 pandemic is not influenced by gender (p-value is.989), grade level (p-value is.756), and student study programs (p-value is.725). This study aims to modify the online learning self-efficacy scale (OLSES) developed by Zimmerman and Kulikowich (2016) and apply it to see the self-efficacy profile of students of the Department of Biology Education, Yogyakarta State University in online learning during the Covid-19 pandemic. This research approach was quantitative with a survey method conducted by giving OLSES questionnaires to 84 students from the Department of Biology Education. The OLSES instrument consists of 19 questions that were valid (Pearson Product Moment value of all items >.215; p <. 05) and reliable (Cronbach's Alpha value.902) to be used as a self-efficacy scale in online learning. The results showed that 1 item had a median value of 3, this item was about the use of online libraries, but the other median items had a value of 4 and 5, that was indicating a high profile of self-efficacy in online learning. Inferential analysis showed that students' self-efficacy online learning during the Covid-19 pandemic is not influenced by gender (p-value is.989), grade level (p-value is.756), and student study programs (p-value is.725). [ABSTRACT FROM AUTHOR]