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Saintia Fisika
Published by Universitas Sumatera Utara
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Articles 59 Documents
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Analisis dan Pembuatan Genteng Polimer dengan Memanfaatkan Limbah Karet Industri Serta High Density Polyethylene (HDPE) Bekas Hafiz Arif Lubis
Saintia Fisika Vol 2, No 1 (2013): Saintia Fisika
Publisher : Saintia Fisika

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Abstract

Polymer’s roof has been made using of waste rubber industry and used high density polyethylene (HDPE) in a mixture of asphalt and fine sand. The study was conducted to determine the optimum mixture of HDPE and fine sand used as independent variables with the variation of the composition of 60:15 gr, 55:20 gr, 50:25 gr, 45:30 gr, 40:35 gr, 35:40 gr, 30:45 gr, 25:50 gr, 20:55 gr, 15:60 gr. Then epoxy resin and catalyst was added. Then it pressed on Hot Compressor with heating temperature of 150°C in 15 minutes. Properties of the Polymers’s roof were tested physical properties such as porosity and water absorption, mechanical properties including impact tests, and flexural strength test. The results showed that the mixture a good fit by the experiment is a mixture of used HDPE and fine sand in the ratio 55:20 gr with 5 gr additional asphalt that useful as a barrier against water and 10 gr of epoxy resin as an adhesive.   Key words: Polymer’s roof, waste rubber, high density polyethylene (HDPE)
PEMBUATAN DAN KARAKTERISASI PLAFON DARI SERBUK AMPAS TEBU DENGAN PEREKAT POLIESTER rizki winda sari
Saintia Fisika Vol 1, No 1 (2013): Saintia Fisika
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Abstract

Studies of plafon have been made with using bagasse. Studies have been done to know the best combination of bagasse powder and polyester with composition of variations to 4 : 8 gr, 6 : 8 gr, 8 : 8 gr, 10 : 8 gr, and 12 : 8 gr. The properties of plafon that analyzed to test physical properties such as water absorption, density and mechanical properties including impact test, the tensile test and bending strength test. The results show that the physical properties (density 1,41gr/cm3 and water absorption 11,54 %) on the composition of bagasse at 4 gr powder are the best results. The higher levels of bagasse powder water absorption the higher the value, so as lower density uptake. Physical properties test results still complete the standards of ISO 03-2105, 1996. From testing the mechanical properties (the tensile test 3058,6 kPa and bending strength test 17,01 MPa and impact test 2 kJ/m2). From all the best specimens test, the composition of 8:8 the best mechanical properties, the results of physical properties also still complete the standards of ISO 03-2105, 1996, so that the composition of 8:8 can be used as a plafon
ANALISIS KALIBRASI ELECTROSURGICAL UNIT DI RSU Dr H.KUMPULAN PANE TEBING TINGGI feriyanta - purba
Saintia Fisika Vol 1, No 1 (2013): Saintia Fisika
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Abstract

Testing and calibration of electrosurgical ARC 350 has been performed Using Electrosurgical analyzer, safety analyzer 601 and held at Balai Pengamanan Fasilitas Kesehatan (BPFK) Medan.This study aimed to obtain information about the method of testing and calibration of the Electrosurgical and to know the result of calibration data are based on the test procedures and calibration of the Electrosurgical from the Balai Pengamanan Fasilitas Kesehatan Republik Indonesia , with the proviso that the Electrosurgical output energy is in threshold of (± 10 % for energy cutting and energy coagulation) of the setting at the timeof testing .From the result of research conducted has been known that the Electrosurgical merk Bowa ARC 350 which has been tested is feasible to use.
PENGARUH PAPARAN RADIASI TERHADAP PETUGAS BRACHYTHERAPY DI RUMAH SAKIT UMUM PUSAT HAJI ADAM MALIK hendrik - samosir
Saintia Fisika Vol 1, No 1 (2013): Saintia Fisika
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Abstract

It has been done Radiation Exposure Effect Brachyterapy Officer at General Hospital Haji Adam Malik. This study aims to determine the radiation dose received by the clerk brachyterapy at General Hospital Haji Adam Malik Medan.Measurement  using film radiation badges and survey meters and supporting data obtained from the Agency for Healthcare Facilities Field Supervisor. The results obtained, the dose received by the clerk brachyterapy still within the limits permitted by the Board of Trustees of Nuclear Power (BAPETEN)  <5000 mrem per year, and found no effect of radiation received by the clerk. The hospital must keep monitoring radiation doses per month and require a medical examination of radiation workers.
PEMBUATAN DAN KARAKTERISASI PLAFON YANG DIBUAT DARI SERBUK BATANG KELAPA SAWIT DAN SERBUK AMPAS TEBU DENGAN MENGGUNAKAN PEREKAT EPOKSI Meilan Agustina Sitorus
Saintia Fisika Vol 2, No 1 (2013): Saintia Fisika
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Abstract

ABSTRACT   Studies have been for the preparation and characterization ceiling that made from oil palm stem powder and sugar cane waste by epoxy as adhesive .The variations of oil palm stem powder and sugar cane waste mixture as an independent variable with composition variations (4:0) gr, (3:1) gr, (2:2) gr, (1:3) gr, (0:4) gr. Then added by 8 ml of epoxy adhesive as fixed variables. The results showed that a good mix is a mixture (2:2) gr which has physical properties (density 1,14 gr/cm3, water absorption 11,39%) and the testing of mechanical properties (5 kJ/m2 impact test, flexural test 18,81 MPa, tensile strength test of 10,38 MPa), these results meet the standard of ISO 03 – 2105, 2006. Test results of DTA obtained the melting point 435 oC and critical point is 345 oC, with the results that the composition of (2:2) gr can be used as a ceiling.   Key words : Ceiling, Oil palm stem powder, sugar cane waste, epoxy resin  
Kajian Teoritis Persamaan Medan Gravitasi Einstein dengan Transformasi Metrik Schwarzschild dalam Sistem Dua Koordinat sabam parsiholan simbolon
Saintia Fisika Vol 2, No 1 (2013): Saintia Fisika
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Abstract

Teoritical studies have been made regarding the transformation of the Schwarzschild metric in two coordinates, the Schwarzschild metric transformation study in two coordinates: coordinates Cartesian and accelerated time-space uniform in no time flat spaces as well as local effects of a gravitational field in curved space. Gravitational field in curved space is chosen the Schwarzschild field is usually expressed in spatial space balls. Through these transformations, their metrics contain two people: (1) the rates associated with elements within the framework of the accelerated line uniform, and (2) the tribe associated with the curvature and geodesic deviation with regard to the effect of the curvature of space time. So that the results obtained from the existence of similarities between inertial mass and gravitational mass are relation with the theory of general relativity can explain local effect in the gravitational field. Key words: Transformation, coordinates, Schwarzschild’s metric
PEMBUATAN DAN KARAKTERISASI KERTAS DARI DAUN NANAS DAN ECENG GONDOK Vivien Ayunda
Saintia Fisika Vol 2, No 1 (2013): Saintia Fisika
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Abstract

ABSTRACT   Research on the manufacture and characterization of paper made from a mixture of pineapple leaf and water hyacinth has been done. The research was conducted using semi-chemical, aiming to obtain an alternative raw material for paper and find out the optimum composition of the mixture of pulp pineapple leaf and water hyacinth. Variations weight percent of the mixture is 100:0%, 80:20%, 60:40%, 40:60%, 20:80%, 0:100%. Pineapple lef and water hyacinth cooked using a 1,5% solution of NaOH, at a temperature of 100oC, then performed with Ca(ClO)2 bleaching process, dried, and then the pulp is mixed according to the composition of the mixture that has been designed. Best composition of a mixture of pineapple  pulp and pulp leaves are water hyacinth leaf pineapple pulp 60% and 40% water hyacinth pulp in which the composition has a grammage 71,23 gr.m-2 and tear resistance 90,5874 mili N in accordance with standart SNI 14-01115-1998 for food wrapping paper with grammage value of 80 gr.m-2 and tear resistance 99 mili N.   Keywords: Pineapple leaf, Water hyacinth, pulp, and  paper.  
Identifikasi Isolator Keramik Jenis Pasak dan Jenis Pos Saluran dengan Metode XRD dan SEM-EDX perdana okto manik
Saintia Fisika Vol 2, No 1 (2013): Saintia Fisika
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Abstract

A Research on identification of insulator pin types of ceramic which is oftenused as an electrical in medium and high voltage has been done.Insulator pintypes of ceramic has 40% Mullite Phase with crystal structure isOrthorombic, lattice parameters a = 7,534 Å, b = 7,678 Å, and c = 2,8814 Å;50 % Quartz Phase with crystal structure is Hexagonal, lattice parameters a =4,9332 Å, b = 4,9332 Å and c = 5,4199 Å; 10% Graphite Phase with crystalstructur is Hexagonal, lattice parameters a = 2,4548 Å and c = 6,702 Å.Microstructure of insulator pin types of ceramic has carbon (C) 10,78 %,Oxygen (O) 49,72 %, Natrium (Na) 0,54 %, Al 9,40 %, Silicon (Si) 27,41 %and Calium (K) 2,15 %.Key words : Ceramic insulator, Crystal structure, XRD and SEM-EDX
PEMBUATAN DAN KARAKTERISASI KERTAS DARI CAMPURAN SERAT JAMBUL NANAS DAN SERAT JERAMI PADI mufridayati mufridayati
Saintia Fisika Vol 2, No 1 (2013): Saintia Fisika
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Abstract

The Research for making and characterization of paper has been made by using crested pineapple and straw fiber. The study was conducted to determine the optimum mixture of crested pineapple fiber and straw fiber composition that varied to 100%:0%,  80%:20%, 60%:40%, 40%:60%, 20%:80%, 0%:100%. Dried crested pineapple cooked by using 1,5 % NaOH with 225 gr in 100 0C. Dried rice straw  was cooked with by using 1,5 % NaOH in 100 0C. Then , the pulp was dried under the sun. The pulp was washed and whitening process with clorine and then it was washed and dried. After that the pulp was mixed according to the ratio, that have been made. The paper with composition of crested pineapple get the index 16.819 Nm / g and tear index is 3.046 x 10-3 Nm2 / g and this paper gramatur 61.24 g/m2. While the rice straw paper composition’s index gained 13.745 Nm / g and tear index 3.559 x 10-3 Nm2 / g. The optimum result of paper was the composition with 40%crested pineapple and the composition with60% rice straw fiber with tensile index 16.945 Nm / g and tear index was 3.719 x 10-3 Nm2 / g, according to the paper with SNI 14-1308-1998. Keywords: Fiber-crested Pineapple, Straw Fiber, Paper Making
PERANCANGAN ROBOT PENYORTIR BENDA BERWARNA BERBASIS MIKROKONTROLER Lyri Martin Simorangkir
Saintia Fisika Vol 2, No 1 (2013): Saintia Fisika
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Abstract

Utilization of today's technology industry demands development in terms of accuracy, speed fully automated. One of the industry's use of technology such as the sorting of objects. Has designed a robot sorter 16 objects color based on microcontroller ATMega8535. The purpose of this study as a sorter object by color automatically with DT- Sense Color. Overall design of the robot consists of 4 (four) as the servo motor actuator arm, one (1) servo motor as the driving conveyors, DT-Sense Color as color sensors, Infra Red, Infra Red Adjustable, ATMega8535 microcontroller, LCD  2x16 and respectively 16th place for the color of objects to be sorted out. The method used for positioning objects laying on the color space used by the mapping method arena. The design which has been made ​​to produce 16 color sorting objects successfully read in conjunction with programs designed. Keywords: Color Sensor, Robot Arm, Microcontroller.

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