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All Journal JURNAL PENELITIAN SAINTIKA Jurnal Ikatan Alumni Fisika Universitas Negeri Medan
Harahap, Mukti Hamzah
Universitas Negeri Medan
Education Physics

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PENGARUH MODEL PEMBELAJARAN BERDASARKAN MASALAH BERBANTUAN MIND MAPPING TERHADAP HASIL BELAJAR SISWA PADA MATERI POKOK KARAKTERISTIK ZAT DI KELAS VII SMP NEGERI 3 PERCUT SEI TUAN T. P 2016/2017 Silitonga, Astrid M T; Harahap, Mukti Hamzah
JURNAL IKATAN ALUMNI FISIKA Vol 3, No 2 (2017): Jurnal Ikatan Alumni Fisika Unimed Edisi April-Juni 2017
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jiaf.v3i2.10737

Abstract

This study aims to determine the effect of problem based learning models for the outcomes of student learning in Characteristics of Substance subject in the first half semester of class VII SMP Negeri 3 Percut Sei Tuan year 2016/2017. This study is a quasi- experimental design by using two group pretest - posttest desain and using odd semester students of class VII SMP Negeri 3 Percut Sei Tuan Deli Derdang as population, which consists of nine parallel classes. The study take two classes as samples by using Cluster Random Sampling technique. The selected sample is class VI1-6 as experiment class dan class VII-1 as the control class with total 35 students in each class. Result data in the study is collected using essay test with total ten questions. The questions which will be used as research instrument is used after content validation process, observation sheet, and hypothesis test using t test. The results showed the average pretest score of experiment class was 33.77 with a standard deviation 5.87 and the average pretest score of control class was 32.83 with a standard deviation 5,52. Outcomes data after the treatment (post-test) in experiment class is 78.34 as average score and a standard deviation 8.69 which classified as high category; and outcomes data in control class is 64.60 as average score and a standard deviation 11.42. From the statistical test, the study obtained tcoum = 5,56 > ttabie = 1,99, a = 0.05. Ha is accepted and H0 is rejected, so it can be concluded that the hypothesis "there is no effect of problem based learning model to the learning outcomes of students in the characteristics of the substance subject in class VII SMP Negeri 3 Percut Sei Tuan" is accepted.
PREPARASI BENTONIT ALAM MENJADI NANO PARTIKEL SEBAGAI FILLER PADA TERMOPLASTIK HDPE Bukit, Nurdin; Ginting, Eva Marlina; Harahap, Mukti Hamzah
JURNAL PENELITIAN SAINTIKA Vol 14, No 2 (2014): SEPTEMBER 2014
Publisher : JURNAL PENELITIAN SAINTIKA

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Abstract

The purpose of this study is the manufacture of natural bentoniteinto nano particles and is used as a filer on thermoplastic high-densitypolyethylene ( HDPE ) . The method used in the manufacture of nano-particles of bentonite are two ways ; The first synthesis method usingsurfactant cetyl trimethyl ammonium bromide ( CTAB ) and the secondway in ballmill for 10 hours . Characterization of the particle sizeanalyzer ( PSA ) , morphological analysis with scanning electronmicroscope ( SEM ) and analysis of the structure by X - ray diffraction (XRD ) was performed . Nano particles with variation of composition ofnatural bentonite ( 2 , 4 , 6 , 8 , 10 % w t) blends with HDPE andcompatibilizer PE - g- MA on the appliance 's internal mixer at atemperature of 150 C and laboplatomil rate of 60 rpm for 10 minute.Berdasarkan PSA analysis and X - ray , natural bentonite having an average size of 75 nm for synthesis with CTAB , and 97.5 nm for the ball mill . from the results of XRD analysis of minerals crystoballite (SiO2 ) and phase annite ( Al3.448Fe3K0.99Na 0.01O12Si 2.552 ) . In testing the mechanical properties of the resulting increase in tensile strength and breaking up the composition perpajangan 2 to 6 % and a decline in the composition of 8 % . The results of SEM analysis showed that homogeneous mixing of ingredients and the bentonite particle agglomeration on the composition of 10 % wt. 
Co-Authors Eva Marlina Ginting Gaol, Ervinna Lumban Harahap, Veryyon Limbong, Lorentina Nurdin Bukit Purba, Evri Yani Silitonga, Astrid M T