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All Journal Delta Jurnal Ilmiah Pendidikan Matematika FKIP Universitas Pekalongan Dentika Dental Journal INDONESIAN JOURNAL OF APPLIED PHYSICS Indonesian Journal of Chemistry Delta: Jurnal Ilmiah Pendidikan Matematika Journal of Technomaterial Physics
Zuriah Sitorus
Postgraduate Program (Physics), Faculty Of Mathematics And Natural Sciences, Universitas Sumatera Utara, Jl. Bioteknologi No. 1 Padang Bulan, Medan 20155, Indonesia
Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Dentistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Mathematics Physics

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PERBEDAAN KEMAMPUAN MATEMATIKA CALON MAHASISWA BARU UNIVERSITAS ASAHAN BERDASARKAN JENIS KELAMIN Sitorus, Zuriah
Delta Jurnal Ilmiah Pendidikan Matematika FKIP Universitas Pekalongan Vol 1, No 2 (2013): Delta Jurnal Ilmiah Pendidikan Matematika Edisi Juli 2013
Publisher : Delta Jurnal Ilmiah Pendidikan Matematika FKIP Universitas Pekalongan

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The researchaimed to determine thedifferences intest resultsof matriculants of Asahan University that were based on gender. To achievethese objectives, the research took samplesby genderandschoolof origin. The results of hypothesis testingshowed that women matriculants hadbetter testresultsthanthemen. This wasevidencedbytcount=2.76>ttable =2.01at significance levelα=0.05.   Kata Kunci :jenis kelamin, tes matematika
PERBAIKAN SIFAT FISIS DAN MEKANIS RESIN AKRILIK POLIMERISASI PANAS DENGAN PENAMBAHAN SERAT KACA: IMPROVEMENT OF PHYSICAL AND MECHANICAL PROPERTIES OF THE HOT POLYMERIC ACRYLIC RESIN BY ADDING GLASS FIBRE Zuriah Sitorus; Eddy Dahar
Dentika: Dental Journal Vol. 17 No. 1 (2012): Dentika Dental Journal
Publisher : TALENTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (329.254 KB) | DOI: 10.32734/dentika.v17i1.1768

Abstract

Resin akrilik polimerisasi panas (RAPP) banyak digunakan sebagai bahan pembuat basis gigi tiruan, karena memilikisejumlah keunggulan di antaranya bersifat biokompatibel, kualitas estetis yang cukup memuaskan, penyerapan air yangrendah, memiliki konduktivitas termal yang baik, mudah diproses dan direparasi tanpa membutuhkan tenaga ahlilaboratorium. RAPP masih memiliki kekurangan terutama dalam hal kekuatan dan kekerasan sehingga bahan ini tidakjarang mengalami retak atau fraktur akibat pemakaian. Beberapa literatur melaporkan bahwa penambahan serat karbon,serat metal, atau serat kaca dalam jumlah tertentu dapat memperbaiki sifat fisis dan mekanis bahan RAPP. Penelitian inibertujuan untuk membandingkan sifat fisis dan mekanis RAPP yang ditambah serat kaca dengan RAPP tanpapenambahan serat kaca. Serat kaca yang digunakan adalah produk Taiwan Glass berukuran 4 mm, 6 mm dan 8 mmsebanyak 1% dari total volume RAPP. Pengujian yang dilakukan meliputi : densitas, porositas, absorbsi air, kekuatantekan, kekerasan vickers, kekuatan tarik, modulus young’s, kekuatan impak dan kekuatan transversal, koordinat warnadan analisa mikrostruktur. Hasil penelitian menunjukkan bahwa RAPP dengan penambahan serat kaca ukuran 6 mmmerupakan kondisi optimum, diperoleh : densitas 1,25 g/cm3, porositas 0,46%, absorbsi air 0,36%, kekuatan tekan 88,89Mpa, kekerasan vickers 21,067kg/mm2, kekuatan tarik 70,43 Mpa, modulus young’s 3328,49 Mpa, kekuatan impak 6,70j/mm2, kekuatan tranversal 129 Mpa. Tidak terlihat adanya perubahan yang signifikan pada warna resin akrilik. Sebagaikesimpulan, penambahan serat kaca ukuran 6 mm sebanyak 1% dari total volume RAPP ternyata dapat menghasilkanpeningkatan kualitas fisis dan mekanis yang optimum dari RAPP.
PERBEDAAN KEMAMPUAN MATEMATIKA CALON MAHASISWA BARU UNIVERSITAS ASAHAN BERDASARKAN JENIS KELAMIN Zuriah Sitorus
Delta: Jurnal Ilmiah Pendidikan Matematika Vol 1, No 2 (2013): Delta Jurnal Ilmiah Pendidikan Matematika
Publisher : Universitas Pekalongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (251.88 KB) | DOI: 10.31941/delta.v1i2.485

Abstract

The research aimed to determine the differences in test results of matriculants of Asahan University that were based on gender. To achieve these objectives, the research took samples by gender and school of origin. The results of hypothesis testing showed that women matriculants had better test results than the men. This was evidenced by tcount = 2.76> ttable = 2.01 at significance level α = 0.05.
Sifat Mekanik Gigi Tiruan Akrilik dengan Penguat Serat Gelas Zuriah Sitorus; Awan Maghfirah; Yoshephin Romania; Syahrul Humaidi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 4, No 02 (2014): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v4i02.4988

Abstract

The research is aimed to investigate the possibility of acrylic-reinforced glass fibre as a denture. Short glass fibre was made by variation of 4mm, 6 mm and 8mm. The results showed a good adhesion between glass fibre and acrylic resin with an optimum composition of the denture (acrylic: oil : glass fibre = 10 gr : 4.5 mL : 0.13 gr) was achieved. The density test was conducted by using Archimedes’ method, whereas compressive strength and tensile strength by using Universal Testing Machine (UTM). The results showed that glass fibre can be used to enhance the mechanical properties of acrylic resin. The optimum composition was achieved when 6 mm fibre had been added-in with a density of 1.2256 gr/cm3. A compressive strength of 76.623 MPa and a tensile strength of 71.207 MPa were recorded, these values can be applied as a denture.
The Optimization of Silica-Based Composite Membrane from Volcanic Ash of Mount Sinabung, Titanium Dioxide, and Polyvinyl Alcohol for River Water Treatment through Photocatalyst Process Moraida Hasanah; Timbangen Sembiring; Zuriah Sitorus; Syahrul Humaidi; Fynnisa Zebua; Rahmadsyah Rahmadsyah
Indonesian Journal of Chemistry Vol 22, No 2 (2022)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.70989

Abstract

The application of composite membranes consisting of SiO2 from the volcanic ash of Mount Sinabung, TiO2, and PVA on a laboratory scale has been investigated to improve the Silau River’s water quality in Asahan Regency. The purpose of this study is to determine the optimal combination of SiO2, TiO2, and PVA for treating river water to minimize its heavy metal content and color intensity to achieve clean water requirements. The membranes were prepared by drop-casting with varied compositions of PVA/40TiO2/60SiO2, PVA/60TiO2/40SiO2, PVA/80TiO2/20SiO2, and PVA/100TiO2/0SiO2. PVA was dissolved in aquadest, mixed with SiO2 and TiO2, then imprinted and dried for 24 h at 50 °C. A photocatalyst test was performed on each composition variation to see how the Silau River water’s color changed over time. The PVA/80TiO2/20SiO2 membrane’s composition fluctuated the highest during photocatalyst testing, with 45.95% degradation. The parameter results on the Silau River water test, namely turbidity, color, and chromium values, were reduced by photocatalysis of a PVA/80TiO2/20SiO2 composite membrane to 16 NTU, 30 TCU, and 0.013 mg/L, respectively. These results met the clean water quality criteria specified by Minister of Health of the Republic of Indonesia Decree No. 416/MENKES/PER/IX/1990.
Manufacture and Characterization of Porous Ceramics Based On Clay Soil And Banana Frond Powder Arianty, Lisa; Sitorus, Zuriah
Journal of Technomaterial Physics Vol. 4 No. 2 (2022): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v4i2.8398

Abstract

This work reports the manufacture and characterization of porous ceramics synthesized using clay and banana frond powder by employing the dry-pressing method. The clay and banana frond powder was filtered with a grain size of 200 mesh. Production of printed ceramics was made with the proportion of the combination of clay and banana frond powder of 100%:0%; 95%:5%; 90%:10%; 85%:15%; 80%:20%; 75%:25%; 70%:30%; 65%:35%; 60%:40%; 55%:45%; 50%:50% and heated with a sintering temperature of 1000°C with a holding time of 3 hours. The resulting ceramics are described by determining their actual properties (thickness, porosity, and shrinkage), mechanical properties (compressive strength and hardness), surface morphology and pore size (SEM), and base material (EDX). The results show that the mixed varieties of 50%:50% clay and banana frond powder have a density value of 1.22 g/cm3, a porosity of 41.31%, and heat loss of 11.41 %, compressive strength of 1.36 MPa, and hardness of 99.15 MPa. The surface morphology results showed that the sample has evenly distributed pore sizes of 10.54 m, 10.77 m, and 12.15 m, which is called a macroporous ceramic with a pore size of > 50 nm.
Manufacture of Polymer Concrete Based on Snake-Fruit Seeds (Salacca zalacca) and Sawdust with Polyester Resin as an Adhesive Harahap, Mahdi Jauhar; Sitorus, Zuriah
Journal of Technomaterial Physics Vol. 5 No. 2 (2023): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v5i2.12380

Abstract

This study aims to determine the effect of adding snake-fruit (Salacca zalacca) seeds and sawdust on polymer concrete's physical and mechanical properties. The results showed that the highest physical properties were 1.27 g/cm3 density, 12.5% ​​porosity, and 13.22% water absorption. The lowest physical properties are a density of 0.85 g/cm3, porosity of 2.65%, and water absorption of 2.07%. The highest mechanical properties are compressive strength of 16.70 Mpa, tensile strength of 4.39 Mpa, and flexural strength of 7.93 Mpa. The lowest mechanical properties are compressive strength of 6.80 Mpa, tensile strength of 1.11 Mpa, and flexural strength of 1.50 Mpa. SEM test results showed that the microstructure of polymer concrete showed differences between concrete samples A1 (consisting of 35 g of snake-fruit seeds, 15 g of sawdust, and 15 g of polyester resin) and polymer concrete samples B1 (consisting of 30 g of snake-fruit seeds, 15 g of sawdust, and 20 g of polyester resin). The SEM analysis of the A1 concrete sample reveals a dark surface color and conspicuous white lumps, which are attributed to polyester resin and arise from inadequate mixing of ingredients. In the case of sample B1, a higher concentration of visible resin lumps is observed.
Co-Authors Arianty, Lisa Eddy Dahar Fynnisa Zebua Harahap, Mahdi Jauhar Maghfirah, Awan Moraidah Hasanah Rahmadsyah Rahmadsyah Syahrul Humaidi, Syahrul Timbangen Sembiring Yoshephin Romania