Article Per Year (5 Year)
p-Index From 2021 - 2026
0.23
P-Index
This Author published in this journals
All Journal Jurnal Fisika Unand JOURNAL OF SCIENCE AND SOCIAL RESEARCH
Sari, Nita Kurnia
Unknown Affiliation
Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics Social Sciences

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Pengaruh Waktu Sonikasi terhadap Konduktivitas Listrik Zeolit Berbahan Abu Dasar Batubara Menggunakan Metode Peleburan Alkali Hidrotermal Sari, Nita Kurnia; Muttaqin, Afdhal
Jurnal Fisika Unand Vol 5 No 4 (2016)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.5.4.322-326.2016

Abstract

Pembuatan zeolit sintetis berbahan abu dasar batubara menggunakan metode peleburan alkali hidrotermal telah dilakukan dengan pemberian sonikasi. Sebelum disintesis, kandungan abu dasar batubara diuji dengan XRF. Hasil XRF menunjukkan bahwa abu dasar yang digunakan memiliki kandungan SiO2 sebanyak 57,236% dan Al2O3 sebanyak 33,172%. Abu dasar dan NaOH dilebur dengan perbandingan 1:1,2 g. Sampel yang telah dilebur, dilarutkan dengan larutan NaAlO2, kemudian diberikan pengaruh sonikasi sebelum proses kristalisasi zeolit (hidrotermal). Variasi waktu sonikasi diberikan pada 4 sampel adalah 0,5; 1; 1,5 dan 2 jam serta 1 sampel tanpa sonikasi sebagai perbandingan. Sampel hasil sintesis dicuci dengan aquades hingga mencapai pH 9-10. Karakterisasi sampel yang dilakukan meliputi karakterisasi morfologi permukaan menggunakan SEM dan pengukuran konduktivitas listrik menggunakan LCR-meter. Hasil karakterisasi SEM menunjukkan sampel dengan pemberian ultrasonik memiliki morfologi permukaan yang lebih seragam daripada sampel tanpa pemberian sonikasi. Nilai konduktivitas listrik yang dihasilkan berkisar dari 0,05206 x 10-6 - 2,1188 x 10-6 S/cm dan berada pada rentang bahan semikonduktor. Zeolit dengan pemberian sonikasi selama 1,5 jam mempunyai konduktivitas listrik tertinggi dibandingkan dengan sampel lain. Kata Kunci : sonikasi, sodalit, philipsite, gobbinsite, konduktivitas listrik zeolit
ANALISIS KEMAMPUAN KOGNITIF SISWA DALAM MENYELESAIKAN OPERASI HITUNG PENJUMLAHAN DAN PENGURANGAN BERSUSUN PADA PESERTA DIDIK KELAS II SD NEGERI 010110 AMBALUTU Revalina, Ananda; Sari, Nita Kurnia; Anim, Anim; Dewi, Juliyani Safika; Khairani, Mufti Annisah
JOURNAL OF SCIENCE AND SOCIAL RESEARCH Vol 8, No 4 (2025): November 2025
Publisher : Smart Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54314/jssr.v8i4.4940

Abstract

The purpose of this study is to examine the cognitive abilities of students in learning addition and subtraction operations with carrying and borrowing in Grade II at SD Negeri 010110 Ambalutu. This research used a descriptive qualitative method. Data were collected through tests on students abilities in performing addition and subtraction operations. The subjects of this study were Grade II students of SD Negeri 010110 Ambalutu, while the object of the research was the teaching and learning of addition and subtraction with carrying and borrowing. The population of this study consisted of 26 students. The collected data were analyzed using data reduction, data presentation, and drawing conclusions. The results show that students mastery of addition and subtraction operations with carrying and borrowing is uneven. Many students are not careful when counting objects in pictures. Some students do not pay sufficient attention to the images, resulting in counts that are either less or more than the actual number. Several students also make mistakes in writing the forms of addition or subtraction with carrying and borrowing. In addition, some students forget to write the carry-over number when the sum of the units exceeds 10. Overall, students cognitive abilities in solving addition and subtraction with carrying and borrowing are in the fair category. The most common mistakes occur in questions that combine numbers and pictures, as students are not yet able to transform visual information into mathematical symbols. Therefore, the use of concrete media, routine practice, and a step-by-step approach is needed to help students improve their ability to perform structured arithmetic operations.
Co-Authors Afdhal Muttaqin anim anim Dewi, Juliyani Safika Khairani, Mufti Annisah Revalina, Ananda