The observations result of the students of SMA Negeri 16 Banda Aceh, showing that the student were less motivated in learning process, they prefer to play and engrossed by their own activities, there were only several students whose really enthusiastic about the material being studied. In order of learning in the classroom went well, so that needs to be innovated the learning activities by using. One of the innovations was used, namely the instructional media, while the learning media that used was the dominoes card and the crossword puzzles. This study aimed to see the effectiveness of learning media on student learning outcomes in learning chemistry by using Dominoes card and crossword puzzle media. This research was the experimental, the research of this research was the student of XI-1 class student experiment class I (dominoes card media) and class XI-2 as experiment class II (crossword puzzle), with total sample was about 37 students. The sample selection based on Purpossive Sampling technique. The instruments used in the form of written tests consist of 20 multiple choice questions with cognitive competence level C1 (knowledge), C2 (understanding), and C3 (application), group worksheet (LKK) in the form of card media and a crossword puzzle, and implementation plan learning (RPP). The data collection techniques were by pretest and posttest, and then analyzed were by using the normality test, homogeneity test, and T test on hypothesis test with 19-version version of the Statistical Program for Social Science (SPSS) program. The results showed that there was no significant difference to the learning outcomes of students who were taught using domino card media and TTS media. It can be concluded that the domino card media and TTS media are very effective in improving the learning outcomes of the students of SMA Negeri 16 Banda Aceh.
Due to its limiting factor of the cycle-life on Zn-polyaniline (PANI) rechargeable battery, the surface morphology and electrochemical properties have been extensively investigated. However, there are no studies that found on the chemical structure of PANI electrode before and after used in the battery with spectroscopy. Here, the Zn-PANI Battery was tested through a 60-cycle discharging process using 10 mA fixed current. The Open Circuit Voltage (OCV) at this condition was ± 1.3 V. The Raman spectra at 488 nm on PANI discharge showed increasing intensity at 1495 cm -1 υ(C=N). Furthermore, the new peak appeared on the band at 1212 cm -1 υ(N=Q=N) and 1166 cm -1 υ(C-H), related to mode on the benzenoid ring. This investigation indicated the formation of Emerald in Bases (EB), caused by the consumption of protons by Zn metal during the filling process.
The biodegradable plastics have been synthesized from janeng starch with the addition of ZnO and Glycerol as plasticizers. The process has used ZnO with variation of concentration by 1%, 3% 6%, then Glycerol with volume 1 ml, 3 ml, and 6 ml. The utilization of 6% ZnO and 3 ml of glycerol showed the highest tensile strength of 2.8 kgf/cm 2 ; conversely, the highest percent elongation was obtained at 1% ZnO with addition 6 ml glycerol to be 4.5%. The lowest water absorption was captured in the composition of 6% ZnO with the addition of 1 ml of glycerol, which was equal to 2.9%, and the decomposition process occurred for 27 to 36 days.
<p>Sebagai alternatif inhibitor sintetis, g<em>reen</em> inhibitor sangat berguna pada material yang tidak memungkinkan digunakan metoda proteksi secara pelapisan dan proteksi katodik. Jambu biji memiliki komponen metabolit sekunder yang dapat digunakan sebagai penghambat korosi. Buah jambu biji diekstraksi menggunakan metoda maserasi. Selanjutnya, ekstrak jambu biji dilakukan karakterisasi secara fitokimia. Kinerja inhibitor dilakukan dengan mengunakan 2 jenis air (sumur dan laut) serta variasi konsentrasi ekstrak yaitu 3%, 10% dan 25%. Laju korosi pada paku menjadi semakin kecil dengan bertambahnya konsentrasi ekstrak. Pada air laut, penambahan 25% ekstrak menunjukkan kenaikan massa sebesar 0,018% dari berat paku mula-mula. Efisiensi inhibitor paling besar terjadi pada penambahan 25% ekstrak yaitu sebesar 98,39% pada media air sumur dan 99,75% pada air laut. Oleh sebab itu, jambu biji sangat berpotensi untuk digunakan sebagai aplikasi <em>green inhibitor</em> masa depan.</p>
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