Effendy, Suhardi
Semarang State University

Published : 4 Documents
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ANALYSIS OF THE MECHANICAL PROPERTIES BRAKE CANVAS WITH BASIC INGREDIENTS OF THE DURIAN FRUIT SKIN AND TEAK LEAVES

Jurnal Bahan Alam Terbarukan Vol 7, No 2 (2018): December 2018 [Nationally Accredited]
Publisher : Semarang State University

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Abstract

The growth of the manufacturing industry in Indonesia affects on the demand of automotive parts. This study aims see the mechanical properties of organic brake canvas made from durian fruit skin and teak leaves. Composite making was done by smoothing durian fruit and teak leaves to become powder. The resulting powder was filtered with mesh 60 so that the particle size is the same so as to facilitate mixing. After that, simple mixing with other ingredients such as magnesium oxide and polyester resin is carried out. The printing process was carried out with a hydraulic press with a load of 4 tons for 3 hours. The brake canvas produced were tested for hardness, wear resistance, and absorbency by varying the percentage composition of the powder of durian fruit fiber and teak leaves. There are five variations in the percentage of composite material composition tested. The results obtained the percentage of the most optimum composition that has a value of hardness, wear wear resistance, and absorption capacity close to the value of the Indonesian National Standard (SNI 09-0143).

Analysis of the Implementation of Reasoning Learning Based on the Scientific Approach in Physics Learning

Journal of Innovative Science Education Vol 8 No 1 (2019): Article In Press
Publisher : Postgraduate, Universitas Negeri Semarang, Indonesia

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Abstract

Physics is an integral part of natural science. Basically physics is the study of natural phenomena in the form of facts, concepts and laws that have been tested by a series of studies. This study aims to describe the implementation of reasoning learning by teachers in public high school students in the city of Palembang. This type of research is descriptive qualitative research. The research was conducted in seven Palembang City State Senior High Schools on Momentum and Impulse material. Subjects in this study consisted of seven teachers and 231 students from seven public high schools in the city of Palembang. Research subjects were determined through purposive sampling technique. The results showed that the implementation of reasoning learning activities was not optimal. Learning the reasoning done by the teacher is limited to reasoning activities which is the final conclusion of the thinking process without observing, asking questions and trying. The final conclusions made by students are only based on the teacher's explanation of the one-way learning process. This can be seen from the percentage of the implementation of reasoning activities on the scientific approach that gets a percentage of 39.04% and is included in the medium category.

Infrared Sensor Kit as a Speed Detector in the Practicum of Energy and Momentum Laws

Journal of Innovative Science Education Vol 8 No 1 (2019): Article In Press
Publisher : Postgraduate, Universitas Negeri Semarang, Indonesia

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Abstract

Material law of conservation of energy and momentum is abstract material. Practical tools are needed in learning to prove the law so that it can foster real learning for students. This research method is an experimental method that aims to find out how to test the energy conservation and momentum law practicum kit. The practicum kit consists of wheeled objects as loads, precision rails as slippery trajectories, and infrared sensor devices to detect the speed of motion of objects. The kits that have been compiled are then validated by experts before use. Kit validation results are valid. In the implementation of the kit testing the independent variables selected are object mass and slope height. The test results obtained that the kit equipped with infrared sensors is quite accurate in explaining the law of conservation of energy which is evidenced by the relative error that occurs is quite small, namely 1%. In testing the law of conservation of momentum obtained the result that the momentum value of the two objects before the collision approaches the momentum value after the collision. The kit testing results become a solution and innovation as a practical tool to help with more tangible learning.

Learning of Physics with Scientific Approach in Boyolali Regency High School

Journal of Innovative Science Education Vol 8 No 1 (2019): Article In Press
Publisher : Postgraduate, Universitas Negeri Semarang, Indonesia

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Abstract

This study aims to describe the implementation of the scientific approach carried out by teachers of State High Schools in Boyolali District. The study used a qualitative descriptive method. The research was carried out on three state high school in Boyolali Regency which were grouped according to the accreditation value. The research subjects were 3 physics teachers of class X and class X students of State High Schools in Boyolali Regency totaling 96 students. The instruments used are observation sheets, questionnaires, and interview guidelines. The results showed that the implementation of the scientific approach in Boyolali District High School was classified as medium. The highest core activity is observing and the lowest is trying. The factors that influence the implementation of the scientific approach by the teacher are infrastructure and laboratory facilities, and time constraints so that the teacher spends time on learning exercises.