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All Journal Jurnal Pengabdian Teknologi Tepat Guna EINSTEIN (E-JOURNAL) IPER (Indonesian Physics Education Research)
Doloksaribu, Maryati Evivani
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Religion Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Other

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Journal : EINSTEIN (E-JOURNAL)

 1 
IDENTIFICATION OF SUBSURFACE SOIL LAYERS USING GEOELECTRIC METHOD IN ENVIRONMENT 2 OF RIANIATE VILLAGE TAPANULI SELATAN REGENCY Kristina; Doloksaribu, Maryati Evivani
EINSTEIN (e-Journal) Vol. 12 No. 3 (2024): EINSTEIN (e-Journal)
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ein.v12i3.48965

Abstract

A research on the identification of subsurface layers using the schlumberger configuration geoelectric method has been carried out on the coast of Lake Siais Environment 2, Rianiate Village, South Tapanuli Regency. With the aim of knowing the identification of subsurface layers, rock types, resistivity values, 2D contour cross section using Res2DinV software and the relationship of the resistivity value of the subsurface layer with climatology data. The results collected on 3 tracks with a length of 155m have a resistivity value of 133Ωm – 3389Ωm on the first track, the second track has 140Ωm - 2768Ωm and the third track 705Ωm - 4358Ωm. The results were processed by Res2DinV software to obtain a 2D cros section. As for the relationship of field data to BMKG data, rainfall has decreased from the last five years from 3744 mm – 3534 mm/year, humidity has decreased by 0,01762% each year, air temperature has increased by 0,09270 0C. From these results, resulting in changes in resistivity value in the subsurface.
EXPERIMENTAL STUDY OF BORATE-BASED GLASS MEDIUM MATERIAL AND HUTA GINJANG QUARTZ SAND THROUGH MELT-QUENCHING TECHNIQUE Pangabean, Jonny Haratua; Hutahaean, Juniar; Sihombing, Luli Warty; Doloksaribu, Maryati Evivani; Rajagukguk, Juniastel
EINSTEIN (e-Journal) Vol. 13 No. 1 (2025): EINSTEIN (e-Journal)
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/eins.v13i1.64965

Abstract

This research aims to produce a glass material based on quartz sand and borate compounds that can later be applied as a host matrix of rare earth ions as optical amplifiers. The research stages began with exploring quartz sand from Huta Ginjang, cleaning, grinding using a ball-mill and mixing with several other compounds namely Boron oxide (B(2) O3), barium oxide (BaO) and sodium oxide (Na2) O. The calculation and weighing process is carried out to obtain the mass of each compound to be used. The composition of each compound is shown through the chemical formula (x)Quartz sand + (60- x)B(2)O(3)+ 10BaO + 30Na2O (where x = 0; 2.5; 5; 10; 15; 20 mol%). The next step is the melting and molding process using the melt-quenching method. Through this experiment, a homogeneous and more transparent glass medium with optimum composition for each former and modifier compound was obtained.
IMPROVEMENT OF BIOPLASTIC CHARACTERISTICS FROM TAPIOCA WASTE USING TITANIUM DIOXIDE AS A FILLER Sipayung, Esther Permata; Doloksaribu, Maryati Evivani
EINSTEIN (e-Journal) Vol. 13 No. 1 (2025): EINSTEIN (e-Journal)
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/eins.v13i1.65201

Abstract

The use of conventional plastics that are difficult to decompose so that the accumulation of plastic waste can cause various problems in the environment. One way to overcome this problem is to replace petroleum-based plastics with other materials that have similar characteristics but are made from renewable materials and have biodegradable properties so that they can decompose naturally in a relatively faster time. Cassava is a polysaccharide containing starch with a high amylopectin content but lower than sticky rice, namely 83% amylopectin and 17% amylose. Tapioca dregs are waste that rots quickly if not processed further. Therefore, efforts are needed to utilize tapioca waste. The addition of Titanium Oxide is very suitable as an antibacterial agent because it is economical, has good mechanical stability, thermal stability, absorbs ultraviolet light, has a photocatalytic effect, and has a large surface area, especially in the manufacture of Bioplastics. Titanium oxide as a filler in bioplastics from tapioca waste can improve the characteristics of bioplastics. In this study, the water resistance value of biodegradable plastics was the highest, namely 47.73%. Titanium Oxide as a filler affects the tensile strength of bioplastics from tapioca waste. The highest tensile stress was obtained at a percentage of 0.8307 MPa, the highest strain was obtained at a percentage of 0.0951%, and the highest modulus of elasticity was 11.4411 MPa. In the biodegradability test with a value of 47.77% with the addition of titanium oxide filler, it meets the requirements to be used as a basic material for biodegradable plastic.
Co-Authors Dedy Husrizal Syah, Dedy Husrizal Deo Demonta Panggabean Herbert Sipahutar, Herbert Jonny Haratua Panggabean, Jonny Haratua Juniar Hutahaean Juniastel Rajagukguk, Juniastel Kristina Mukti Hamjah Harahap, Mukti Hamjah Pangabean, Jonny Haratua Sembiring, Rinawati Sihombing, Luli Warty Sipahutar, Angelson Fery Estomihi Sipayung, Esther Permata Tri Effiyanti