Faculty of Mathematics and Natural Sciences: Recent submissions
Now showing items 1541-1560 of 11354
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Pemanfaatan Kulit Udang (Penaues Monodon) sebagai Kitosan dan Turunannya untuk Menurunkan Konsentrasi Ion Logam Ni dan Cr dengan Ekstrasi Fasa Padat Sebagai Sumber Air Bersih
(Universitas Sumatera Utara, 2006)The chitin used to produced chitosan in this study was isolated from prawn shells by wet chemistry. The percentage yileds of chitin were 30,8%. Chitosan was prepared by deacetylation of the chitin which produced 71,6%. A ... -
Pengembangan Algoritma Frank-Wolfe Untuk Menyelesaikan Problema Quadratic Integer Programming Murni
(Universitas Sumatera Utara, 2006)Quadratic Integer Programming is a mathematical programming model in which the objective function has quadratic form, the constraints are linear and the decision variables are restricted to integer value. Such model has ... -
The Enhancement of Transition Temperature and Phase Stability in (TI2-xMxBa2CaCu28-8) High Temperature Superconductor with M=Cr and Te
(Universitas Sumatera Utara, 2017)Two series of the Tl-based (T1-2212) high temperature superconductor, Th2-xCryBa2CaCu2O8- and Th2-TexBa2 CaCu2O-s have been prepared via solid state reaction. The substitution of Cr and Te to the TI-site is aimed to ... -
Penggunaan Kitosan dan Turunannya Sebagai Penyalut Silika Gel dan Filter Fiber Glass Untuk Menyerap Logam Ni dan Cr dakam Sistem Aquatik dengan Ektraksi Fasa Padat
(Universitas Sumatera Utara, 2006)The use of chitosan and its derivative for Ni(II) and Cr(III) metal ions absorption in aquatic system using solid phase extraction has been studied. The chitosan was obtained from chitin produced by wet chemical process ... -
Organogenesis dari Kelapa Sawit Asal Eksplan Tunas Pucuk (Apical Bud)
(Universitas Sumatera Utara, 2014)The purpose of this research is to find out explants apical bud from oil palm of different position which are apex, middle, and basal segment, were cultured in Y3 medium suplemented with 2,4-D in the presence of activated ... -
Pemanfaatan Limbah Padat Industri Karet Sarung Tangan Dan Poliurethane Alam Dalam Pembuatan Genteng Polimer yang Kedap Suara
(Universitas Sumatera Utara, 2013)Polymer's roof has been done using solid waste in rubber gloves industry with the best mixing composition from the making of polymer's roof Samples from any composition which is done thus being pressed by hot compressor ... -
Pengolahan Karakterisasi Abu Boiler Kelapa Sawit dan Abu Sekam Padi Menjadi Nano Partikel sebagai Bahan Pengisi Termoplastik HDPE
(Universitas Sumatera Utara, 2014)This study aims to obtain palm ash and rice husk ash in the nano-size particles with 2.5 M NaOH solution process for 4 hours and then dissolved in a ball mill for 15 hours. To determine the effect of nano-particles of ... -
Studi Penempatan Transformator Distribusi Berdasarkan Jatuh Tegangan Pada PT. PLN (Persero) Rayon Medan Kota
(Universitas Sumatera Utara, 2011)Distribution system is a system that transmits electricity from generating electrical energy to consumers in mid-scale voltage to low voltage. Where in the distribution of electrical energy required a considerable distance ... -
Studi Statistik Kuantum dalam Fungsi Partisi
(Universitas Sumatera Utara, 2010)Partition function used for the N of harmonis oscillator or N of particle of boson and also fermion to free particle identic system do not interact by comparing result of calculation between Einstein model with method ... -
Rancangan Alat Pengontrol Kecepatan Putar Motor Listrik Berbasis Mikrokontroler AT89S52
(Universitas Sumatera Utara, 2010)Had design a instrument who can measure and controlled of electric motor who active otomaticly. The Instrument controlled electric motor before with control voltage gived at motor. This instrument design for defend stability ... -
Prototype Kontrol Temperatur Pada Sebuah Inkubator Penetas Telur Berbasis Mikrokontroller AT89S52
(Universitas Sumatera Utara, 2011)With developments in technology, requires innovation to create the tool as a substitute for egg incubator hatching eggs manually, by way of using light as a conduit of an unbiased temperature changed. AT89S52 one IC is ... -
Pembuatan dan Karakterisasi Keramik Berpori dari Campuran Zeolit dan Bahan Aditif Arang Sekam Padi dengan Perekat Polivinylalcohol (PVA)
(Universitas Sumatera Utara, 2010)The phorous ceramics based on zeolite and ash of hush of paddies had been fabricated and characterized. Both substances were pulverized and sieved with a 100 mesh. The variations of composition were 100:0, 90:10, 80:20, ... -
Rancang Bangun Miniatur Security Ruangan Menggunakan Pintu Otomatis Berbasis Mikrokontroler AVR ATmega8535
(Universitas Sumatera Utara, 2010)Security system in banking is a standardization that must applied as security facilities and pleasure for agent of economy who save their wealth in bank. Necessity of security is one of it can loaded with simple method ... -
Kinematika Gerak Perpindahan Gelombang Air Dipermukaan Bidang Berbentuk Lingkaran
(Universitas Sumatera Utara, 2011)Kinematics of motion displacement of water waves in circle surface consider about two-dimensional wave equation in a Cartesian coordinate system by using variable separation method. In entire discussion, the two-dimensional ... -
Perancangan Kwh Meter dengan Sistem Prabayar Berbasis Mikrokontroller AVR ATMega8535
(Universitas Sumatera Utara, 2010)Has been designed a Kwh Meter Listrik with Prepaid System by using EEPROM Microprocessor which can maintain data though happened disconnection of energy power allowance. Device designed equiped with Keypad 4 x 4 and ... -
Simulasi CFD Persamaan Navier Stokes Untuk Aliran Fluida Tunak Laminar di Antara Plat Sejajar
(Universitas Sumatera Utara, 2010)Real fluid behavior requires a distinction between the boundary layer, where stress effects are concentrated and areas where the potential flow of ideal flow hypothesis is fulfilled. Analysis of flow between two plates, ... -
Analisis Tingkat Kebisingan Pesawat Terbang di Pasar 6 dan Simpang Pos Padang Bulan Medan
(Universitas Sumatera Utara, 2010)Has done research on Aircraft Noise Level in Pasar 6 and Simpang Pos Padang Bulan Medan at the time of take off and landing with various types or kinds of aircraft. At the level of aircraft noise can in Pasar 6 Padang Bulan ... -
Pengaruh Suhu dan Waktu Pembakaran Pada Struktur Beton terhadap Kuat Tekan Beton
(Universitas Sumatera Utara, 2010)Concrete that has been printed after the age of 28 days of drying the treated fuel at temperatures 100oC, 200oC, 300oC, 400oC, 500oC, 600oC, 700oC and 800oC with holding time (holding time) 20 minutes, 40 minutes and 60 ... -
Pengaruh Penambahan Abu Batubara terhadap Sifat Fisis dan Mekanik Mortar
(Universitas Sumatera Utara, 2010)The composition mixture of coal ash in this research is respectively 5%, 10%, 15%, 20%, 25% and 30% from the weight of the cement. The samples used are square and cylindrical objects. From the research, it is found that ... -
Pemanfaatan Serat Ijuk Pendek dalam Pembuatan Beton Ringan terhadap Sifat Mekaniknya
(Universitas Sumatera Utara, 2010)Concrete with a mixture of short palmyra fiber was made by submersion time 28 days. Mechanical and physical propertiesof the samples: compressive strength, density, and water absorbtion has been determined by ASTM and SNI ...