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This study aims to produce and develop learning media based on Android applications and Arduino microcontrollers which are named "Sapta Maino Education". The development of learning media based on Sapta Maino Education is done to be able to attract students motivation in learning, especially the material to build flat side spaces. In addition to that, learning can adjust technological developments and teachers are expected to be able to spur creativity in making learning media that follows the development of the era. This research uses research and development methods with the ADDIE development model. The data collection method uses an instrument in the form of a questionnaire. Validation involves two material experts and two media experts, then a trial run on students. The results of this study are in the form of learning media based on Sapta Maino Education consisting of Android and Arduino LED Cube applications. The results of the assessment of media experts got a percentage of 89.4%. Material experts 86.21%., And the percentage of respondents or students amounted to 89.4%. All three are included in the "very decent/very good" category. The results of the study have the disadvantage that the material is only limited to the material Cubes and Beams. Based on the results of the assessment by media experts, material experts and usage tests by respondents, it can be concluded that learning media based on Sapta Maino Education is very feasible to use. [ABSTRACT FROM AUTHOR]

Mathematical communication skills are one of the important abilities possessed by students in learning mathematics. Based on several results of the literature study showed that students' mathematical communication skills are still relatively low. One effort that can be done to improve students' mathematical communication skills is to apply the 7E learning cycle learning model. The purpose of this study is to investigate the improvement in mathematical communication skills of students who use the 7E learning cycle learning model is higher than students who use conventional learning. This type of research is a quasi-experiment using pre-and posttest design. The population in this study were students of class VIII of Junior High School 1 Gantung and the sample of this study was students of grades VIII C and VIII D. The sampling technique used was convenience sampling. The research instrument used to answer the problem formulation was an instrument of mathematical communication ability test in the form of the problem description. The subject in this study is the prism material. The formulation of the problem in this study was answered by inferential statistics using the pooled variance model t-test. The results showed that an average increase in mathematical communication skills was 0.330 for the experimental class and 0.241 for the control class so that the conclusion was that the increase in mathematical communication skills of students who used the 7E learning cycle learning model was higher than that of students using conventional learning. [ABSTRACT FROM AUTHOR]

Given commutative algebra R and R -module U, Hadi et al constructed the category of supermodules CU whose objects are all pairs of R -modules (N, M) where N is direct sum of U and M contains U. If U and W are R-modules then there were relations between the categories CU and CW under some conditions. For instance, if W is direct sum of U then there exists a covariant functor from CU to CW. Further, if U and W are isomorphic then such functor is a category equivalence. In this paper we investigate the relation between two categories of supermodules over different algebras. [ABSTRACT FROM AUTHOR]

The scopes of this conference covered mathematics, general physics, chemistry, biology, computer science and technology. Preface: The 2 nd Science and Mathematics International Conference (SMIC 2020) We are delighted to present the proceeding of the 2 nd Science and Mathematics International Conference (SMIC 2020). The conference was organized by the Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Indonesia, on 8 - 9 August 2020. [Extracted from the article]

Electrodeposited Nickel (Ni)-/Nitride composite coating has been widely used and studied in many technological applications due to its high resistance to wear and corrosion. The morphology and composition of the composite coating were key for the remarkably performance and could be obtained during the deposition process. This paper is a report on a preliminary study of the effect of elevated temperature at 50 °C and 60 °C on the microstructure of Ni-TiN-AlN/Si3N4 composite coatings. The deposition process was conducted by using electrodeposition at a fixed current density of 2.5 mA/cm2 for 15 minutes. The bath composition consisted of 6 g/L TiN, 6 g/L AlN, 0.6 g/L Si3N4, 0.17 M NiCl2(6H2O), 0.38 M NiSO4(6H2O), 40 g/L H3BO3, and 0.6 g/L SDS. The surface morphology and composition are characterized by using Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS), respectively. It shows that the coating morphology was more compact at a temperature of 60 °C, followed by the decrease of Ni content while Ti, Al, and Si contents increased. [ABSTRACT FROM AUTHOR]