Faculty of Mathematics and Natural Sciences: Recent submissions
Now showing items 101-120 of 11100
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Sintesis Nitrogen-Doped Carbon Dots (N-CDS) dengan Metode Hidrotermal dari Kulit Nangka dan Potensinya Sebagai Antibakteri
(Universitas Sumatera Utara, 2024)This research aims to utilize jackfruit peel waste as a carbon source for synthesizing Carbon Dots (CDs) and Nitrogen-Doped Carbon Dots (N-CDs), as well as to evaluate the antibacterial potential of N-CDs. In the first ... -
Peningkatan Aktivitas Fotokatalitik Titanium Dioksida Termodifikasi Carbon Dots Biji Asam Jawa (Tamarindus Indica.L) sebagai Bahan Pendegradasi Pewarna Naftol Hijau B
(Universitas Sumatera Utara, 2024)The photodegradation ability of titanium dioxide nanoparticles can be increased by the addition of carbon dots from tamarind seeds (Tamarindus indica.L) in degrading green naphthol B synthetic dye. The stages carried out ... -
Sintesis Poliuretan dari Campuran Getah Damar Mata Kucing (Shorea Javanica) dan Peg 400 dengan Toluena Diisosianat (TDI)
(Universitas Sumatera Utara, 2024)The synthesis of polyurethane from Damar mata kucing (Shorea Javanica) and PEG 400 using isocyanate monomer was carried out by reacting the resin resin with 98% formic acid and 30% H2O2, then polyurethane was made by ... -
Efektivitas Karbon Aktif Kulit Biji Kopi Sebagai Adsorben Terhadap Penurunan Kadar Logam Besi (Fe) pada Air Sumur Bor
(Universitas Sumatera Utara, 2024)The material that can be used to make active carbon is coffee bean skin which is still underutilized. This research was carried out to reduce iron (Fe) levels using activated carbon from coffee bean skins with KOH activator ... -
Pengukuran Laju Paparan Radiasi dan Efektivitas Perisai Radiasi Pada Ruang Cs-137 di BPFK Medan
(Universitas Sumatera Utara, 2024)One of the radiation protection programs has been carried out by measuring the exposure to scattering radiation around the cesium-137 room at BPFK Medan. Measurements were made in five rooms using a babyline surveymeter. ... -
Pengaruh Penambahan Polivinil Alkohol terhadap Pembuatan dan Karakterisasi Biodegradable Foam dari Tepung Porang dan Serat Cangkang Biji Kopi
(Universitas Sumatera Utara, 2024)This research has been conducted to make biodegradable foam using porang flour, coffee bean shell fiber and magnesium stearate with the addition of polyvinyl alcohol (PVA) variations of 40%, 50% and 60%. The stages in this ... -
Pembuatan dan Karakterisasi Karbon Aktif dari Ampas Teh Sebagai Adsorben Ion Pb
(Universitas Sumatera Utara, 2024)The manufacture and characterization of activated carbon from tea dregs as an adsorbent of Pb ions has been carried out. This study aims to make activated carbon from tea dregs as an adsorbent of Pb ions; determine the ... -
Pengaruh Komposisi Al2O3 pada Phase Change Material Berbasis Peg–6000
(Universitas Sumatera Utara, 2024)Phase Change Material (PCM) research has been conducted by mixing PEG 6000 - Alumina Oxide (Al2O3) - Sodium Dodecyl Benzene Sulfonate as a Thermal Energy Storage (TES) application. This research is intendent to produce the ... -
Peramalan Harga dan Tren Saham Menggunakan Model Arima-Garch dan Hidden Markov Model
(Universitas Sumatera Utara, 2024)In this study, the ARIMA-GARCH model is used to forecast stock prices and volatility, while the Hidden Markov Model (HMM) is used to detect hidden trends based on the forecasting results. The data used is the historical ... -
Penentuan Outlier pada Data Multivariat Berbasis Jarak dengan Kuantil
(Universitas Sumatera Utara, 2020)The quantile model is a method for detecting data that is classified as outliers. There are many methods that have been applied by researchers before. Some of them are the minimum volume ellipsoid (MVE) method, the minimum ... -
Jumlahan Jarak Hamming Berbobot
(Universitas Sumatera Utara, 2020)The Hamming distance between two binary digits is the number of differences be- tween two series of binary numbers that have the same length according to the position of each binary digit. The sum of the Hamming distances ... -
Pengelompokan Data Kasus Covid-19 di Sumatera Utara dengan Metode K-Means
(Universitas Sumatera Utara, 2022)Cluster is a multivariate technique that aims to classify objects into different groups from one group to another. Objects that have been classified in one cluster are objects that have the same relative distance proximity ... -
Perbandingan Fuzzy AHP-SAW dan Fuzzy AHP-VIKOR dalam Pemilihan SPF Tabir Surya Wajah
(Universitas Sumatera Utara, 2024)Sunscreen is a crucial skin care product for maintaining healthy skin from the sun. One of the important ingredients in it is Sun Protection Factor or SPF. In its selection, the Analytical Hierarchy Process method is widely ... -
Isolasi dan Identifikasi Golongan Senyawa Flavonoid Serta Uji Aktivitas Antibakteri dari Kulit Batang Kelengkeng (Dimocarpus Longan Lour.)
(Universitas Sumatera Utara, 2024)Flavonoid compounds have been isolated from the bark of longan (Dimocarpus longan Lour.). The isolation stage begins with maceration extraction using methanol solvent. The concentrated methanol extract was partition extracted ... -
Rancang Bangun Alat Deteksi Panas Kabel Berbasis Internet of Things (IoT) Menggunakan Mikrokontroler Node MCU V3
(Universitas Sumatera Utara, 2022)Electricity is the most widely used energy today because of its practicality and efficiency in terms of control and distribution. Electrical energy is the easiest to distribute because it is not physical because it only ... -
Penerapan Teori Permainan dalam Menentukan Strategi Pemasaran Optimum pada Produk Mi Instan (Mie Sedaap, Gaga, dan Supermi) di Lingkungan Mahasiswa Matematika Universitas Sumatera Utara
(Universitas Sumatera Utara, 2024)Instant noodle consumption in Indonesia has continued to increase in the last few years, which indicates that there are more business opportunities for instant noodle products in Indonesia. Proved by the number of instant ... -
Analisis Kualitas Pelayanan Sekolah SMAN 1 Berastagi Terhadap Kepuasan Siswa dengan Metode Importance Performance Analysis (IPA)
(Universitas Sumatera Utara, 2024)In improving the quality of service to provide satisfaction to students, SMAN 1 Berastagi needs efforts to meet student expectations, so that students get satisfaction with the services provided by SMAN 1 Berastagi. Student ... -
Analisis Pengaruh Faktor - Faktor Customer Relationship Marketing terhadap Loyalitas Nasabah Menggunakan Metode Analisis Regresi Linier Berganda
(Universitas Sumatera Utara, 2024)In this research multiple linear regression analysis discussed, where data analysis is first carried out. Many factors affect loyalty, including customer relationship marketing with the dimensions of communication, commitment ... -
Jenis dan Keanekaragaman Aves di Kampus Universitas Sumatera Utara, Kota Medan, Sumatera Utara
(Universitas Sumatera Utara, 2024)University of North Sumatera as a strategic place to investigate the biodiversity of flora and fauna as a source if germplasm of life in the world of education. The University of North Sumatera as a green campus is considered ... -
Pembuatan dan Pengujian Campuran Bahan Bakar Bensin Berbasis Pemanfaatan Limbah Pisang
(Universitas Sumatera Utara, 2024)In this research, the use of bioethanol from banana peel waste as a mixture of gasoline fuels has proven to be effective in reducing problems that really annoy community and is proven to be able to improve engine performance ...