Jenis penelitian ini adalah penelitian eksperimen dengan desain quasi eksperiment yang berbentuk pretest-postest control group design. Tujuan penelitian ini adalah untuk mengetahui; (i) perbedaan motivasi belajar kimia peserta didik yang dibelajarkan menggunakan media pembelajaran berbasis Macromedia Flash 8 pada model pembelajaran kooperatif melalui pendekatan saintifik dengan peserta didik yang dibelajarkan tanpa menggunakan media pembelajaran berbasis Macromedia Flash 8 di kelas X SMAK Makassar pada materi pokok laju reaksi; (ii) perbedaan hasil belajar kimia peserta didik yang dibelajarkan menggunakan media pembelajaran berbasis Macromedia Flash 8 pada model pembelajaran kooperatif melalui pendekatan saintifik dengan peserta didik yang dibelajarkan tanpa menggunakan media pembelajaran berbasis Macromedia Flash 8 di kelas X SMAK Makassar pada materi pokok laju reaksi. Teknik analisis data yang dilakukan adalah analisis statistik deskriptif dan analisis uji prasyarat yang terdiri dari uji normalitas dan uji homogenitas. Pengujian hipotesis dihitung menggunakan program SPSS 22 dengan analisis One-way Anova dengan kriteria pengujian: terima H1 jika signifikansi (p) yang diperoleh lebih besar dari α = 0,05. Hasil penelitian ini menunjukkan bahwa; (i) ada perbedaan motivasi belajar peserta didik yang dibelajarkan menggunakan media pembelajaran berbasis Macromedia Flash 8 pada model pembelajaran kooperatif melalui pendekatan saintifik dengan peserta didik yang dibelajarkan tanpa menggunakan media pembelajaran berbasis Macromedia Flash 8 di kelas X SMAK Makassar pada materi pokok laju reaksi; (ii) ada perbedaan hasil belajar peserta didik yang dibelajarkan menggunakan media pembelajaran berbasis Macromedia Flash 8 pada model pembelajaran kooperatif melalui pendekatan saintifik dengan peserta didik yang dibelajarkan tanpa menggunakan media pembelajaran berbasis Macromedia Flash 8 di kelas X SMAK Makassar pada materi pokok laju reaksi. Kata kunci: Macromedia Flash 8, Kooperatif, Saintifik, Motivasi Belajar, Hasil Belajar.
So far the application of chitosan as an adsorbent still uses microscale chitosan adsorbent. The microscale chitosan has not adsorbed waste maximally either to the weight of the adsorbent usage or the target adsorption capacity. Nanoscale adsorbent size has not been widely used, especially as an adsorbent of dyes waste. Therefore, through micro-size reconstruction into nano chitosan will provide maximum opportunities in its utilization. This study reconstructs the size of chitosan into nanochitosan and binds crosslinking with phosphate. Synthesis using ionic gelation method. The crosslinked results were characterized using FTIR, PSA and SEM-EDX instruments, followed by parameter optimization including pH optimization, interaction time, adsorption capacity and application. The amount of absorbed dye concentration was analyzed using UV-Vis spectrophotometer. The measurement results showed that the physical reconstruction of chitosan was successfully carried out with a wavelength range of 246nm-260nm as an indication of nanochitosan adsorbent at pH 7-9 using 5% nanochitosan. It was concluded that the nanochitosan from the synthesis could be reused for 2 times, with desorption percentage of 86%.
Silver nanoparticles act as anti-bacterial and anti-inflammatory. On the other hand, some plants contain reducing agents. Therefore, it is deemed necessary to know the potentiality of plant extracts such as green tea leaf extract on the synthesis of silver nanoparticles. The Methanol extract of green tea leaves serves as a reduction of AgNO3 solution. Determination of the optimum reaction time in forming nanosize using UV-Vis spectrophotometer every 30 minutes. Characterization of nanoparticles obtained using scanning electron microscopy (SEM) and particle size analyzer (PSA). The results showed that green tea leaf extract was able to reduce Ag + to silver nanoparticles at a reaction time of 90 minutes, the temperature of 70°C. Morphology is not uniform, tends to aggregate, and the size distribution of silver nanoparticles is 82.33-740.89 nm with an average diameter of 157.8 nm.
The preparation and characterization of glass reinforced epoxy filled with different weight percentage of geopolymers filler attained from fly ashand epoxy resins are reported limited of study. Recent glass reinforced epoxy pipe are reported exhibits relatively low mechanical properties, which limit their usage in structural applications and in oil and gas industrial. Thus, this restriction could be overcome through the formation of the addition of geopolymer fillers to improve their strength and toughness. The glass fiber was impregnated with different weight percentage and different molarity of fly ash-based geopolymer and epoxy hardener resin. Composite samples were made manually by filament winding technique and cured under room temperature. The sections perpendicular to the fibers and surfaces of the composites were analyzed by means of scanning electron microscope to estimate the adhesion between geopolymer matrices and fiber reinforcement. Relatively, wide range of geopolymer weight percentage from 10 % to 30 % at which can obtain high compressive properties, maximal values of compressive strength is 94.64 MPa and compressive modulus 2373.58 MPa for the sample with 30 % weight percentage of filler loading. These new composites materials show expressively enhanced mechanical properties if matched to straight glass reinforced epoxy pipe without any geopolymer filler. The positive mixture of synthetic method with the use of industrial by-products has acceptable fabricating novel low cost aluminosilicate binders, thanks to their suitable bondin contradiction of materials frequently used in structural application, could be used within the field of oil and gas industry.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.