Faculty of Mathematics and Natural Sciences: Recent submissions
Now showing items 21-40 of 11051
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Pengaruh Variasi Massa Kalium Bromida (KBR) terhadap Sintesis pada Nanosilikon dari Pasir Alam Pantai Cermin secara Magnesiotermik
(Universitas Sumatera Utara, 2021)Synthesis of nanosilicon from natural sand has been carried out with the addition of KBr salt by magnesiothermic method. Silica was extracted from natural sand with the addition of 10 N NaOH and 6 N HCl and analyzed by ... -
Pemanfaatan Ekstrak Etanol Mahkota Nanas (Ananas Comosus L. Merr.) sebagai Antioksidan pada Sediaan Moisturizing Gel
(Universitas Sumatera Utara, 2025)Moisturizing gel is one of the treatments that aims to improve dry skin with ingredients contained in cosmetics. Pineapple crown (Ananas comosus L. Merr) is known to contain flavonoid compounds that have the potential to ... -
Pemanfaatan Zeolit Sintesis dari Limbah Fly Ash Sebagai Adsorben Logam Mangan (Mn) pada Air Sumur Bor di Kawasan Deli Tua
(Universitas Sumatera Utara, 2025)Fly ash waste is a waste that has not received optimal treatment in its utilization until now. Fly Ash has a high Silica (Si) and Aluminum (Al) content so it is suitable to be used as a synthetic zeolite that has an ... -
Formulasi Sediaan Krim Tabir Surya dari Karboksimetil Kitosan dan Penentuan Nilai SPF (Sun Protecting Factor) secara In Vitro
(Universitas Sumatera Utara, 2025)A study has been conducted on the use of carboxymethyl chitosan (KMK) in the formulation of sunscreen cream preparations as a skin protector from excessive sunlight. Sunscreen is a cosmetic ingredient that scatters UV ... -
Sintesis dan Karakterisasi Reduced Graphene Oxide (RGO) Terdoping Nanopartikel Besi Oksida (Fe2O3) sebagai Eletroda Baterai Primer
(Universitas Sumatera Utara, 2025)A study has been conducted on the Synthesis and Characterization of Reduced Graphene Oxide (RGO) Doped with Iron Oxide (Fe2O3) Nanoparticles as Primary Battery Electrodes. The purpose of this study was to analyze the ... -
Pembuatan Filter Berbasis Karbon Sekam Padi dan Zeolit Sintesis sebagai Pereduksi Ion Logam Pb dan Mn pada Air Sumur
(Universitas Sumatera Utara, 2025)In this study, a filter based on carbon from rice husk and synthetic zeolite was made for well water. First the rice husk is pulverized and then carbonized with temperature variations of 700oC, 800oC, and 900oC. Then the ... -
Sistem Pengukuran Kecepatan Arus dan Ketinggian Permukaan Air Sungai Bilah Rantauprapat Secara Digital Berbasis Internet of Things (IoT)
(Universitas Sumatera Utara, 2025)The high intensity of rainfall in the upstream area of the Bilah Rantauprapat River significantly increases the water discharge, potentially triggering flooding in the downstream area. This study aims to develop a real-time ... -
Sistem Pengereman Adaptif Turbin Angin Menggunakan Servo Dilengkapi dengan Monitoring Berbasis Internet of Things (IoT)
(Universitas Sumatera Utara, 2025)Wind turbines are increasingly recognized as one of the effective solutions for generating clean and sustainable energy. In this study, an adaptive braking system for five-bladed wind turbines was developed, utilizing the ... -
Sintesis Karbon Dots (CDs) Emisi Ganda Menggunakan Metode Hidrotermal dengan Penambahan Etilendiamin Sebagai Agen Pasivasi
(Universitas Sumatera Utara, 2025)Carbon dots are carbon nanoparticles with sp2/sp3 hybridization structures that exhibit single or dual emission during fluorescence phenomena. Dual-emission carbon dots offer advantageous excitation-emission characteristics ... -
Pemanfaatan Karbon Aktif dari Ampas Tahu dengan Aktivator Natrium Klorida (Nacl) dalam Penurunan Konsentrasi Logam Kadmium (Cd)
(Universitas Sumatera Utara, 2024)The waste produced by tofu dregs contains cellulose compounds which can be used as a basic ingredient in making active carbon. The aim of this research is to determine how to make active carbon by utilizing tofu dregs ... -
Potensi Enterobacter Sp. LB04, Bacillus Cereus LB13, dan Pseudomonas Sp. LB14 Sebagai Agen Biofungisida Cendawan Penyebab Kerusakan Buah Tomat
(Universitas Sumatera Utara, 2024)Postharvest fruit rot in tomatoes due to pathogenic field fungi are estimated to cause between 25 and 42% economic losses of total production globally. The primary utilization of synthetic fungicides to control postharvest ... -
Penerapan Metode Double Exponential Smoothing untuk Meramalkan Jumlah Angkatan Kerja di Kabupaten Toba Samosir Pada Tahun 2021-2022
(Universitas Sumatera Utara, 2021)The workforce is a population aged 15 to 65 years who are currently working or looking for work. The workforce in Toba Samosir Regency has increased almost every year. The data in this study are secondary data obtained ... -
Aplikasi Penalized Maximum Likelihood Estimation pada Distribusi Weibull dengan Algoritma Gradient Descent
(Universitas Sumatera Utara, 2025)The Weibull distribution is widely used in reliability analysis and failure modeling due to its flexibility in modeling various types of data. For accurate parameter estimation, the Penalized Maximum Likelihood Estimation ... -
Estimasi Parameter Distribusi Weibull Menggunakan Metode Maksimum Likelihood
(Universitas Sumatera Utara, 2025)In various types of statistical analysis, the Weibull distribution is an important continuous probability distribution. One crucial aspect of studying this distribution is estimating its parameters. The maximum likelihood ... -
Sintesis Timah (II) Sulfat (SnSO4) Menggunakan Metode Elektrolisis dengan Parameter Tegangan, Konsentrasi, Waktu dan Jarak Elektroda
(Universitas Sumatera Utara, 2024)Tin (II) Sulfate (SnSO4) a tin-derived product that has a wide range of physical and chemical functions. The synthesis of tin (II) sulfate (SnSO4) has been carried out using the parameters of voltage, electrolyte ... -
Model Cox Proportional Hazard dalam Analisis Survival Penderita Penyakit Sirosis Hati
(Universitas Sumatera Utara, 2025)Survival analysis is a field of statistics that studies how individuals or objects endure over time. One commonly used statistical method in this field is the Cox Proportional Hazard Model. This model is used to determine ... -
Pelapisan Chrome terhadap Zirconium dengan Metoda Pack Cementation terhadap Laju Korosi
(Universitas Sumatera Utara, 2025)The manufacture of zirconium alloy coating with chrome by using pack cementation method and comparison of its corrosion Knowing the effect of coating on zirconium plate in 9000C temperature and comparing its corrosion ... -
Gambaran Histologi Pankreas Tikus (Rattus norvegicus) yang Diinduksi 7,12-Dimetilbenz-[a] Antrasena (DMBA) Dengan Pemberian Ekstrak Etanol Kulit Durian (Durio zibethinus Murr.)
(Universitas Sumatera Utara, 2025)Durian (Durio zibethinus Murr.) contains secondary metabolite compound, flavonoids metabolite compound has a role as an antioxidant. Flavonoid compounds are able to capture and neutralize free radicals so they can repair ... -
Sintesis BaFe(12-x)YxO19 Sebagai Material Penyerap Gelombang Mikro Dengan Metode Solid-State Reaction
(Universitas Sumatera Utara, 2025)In this research study, barium hexaferrite substituted with yttrium (BaFe(12-x)YxO19), microwave absorber materials has been successfully synthesized using solid-state reaction method, pre-sintering at 800 °C for 6 hours ... -
Sintesis dan Karakterisasi Phase Change Material Berbasis Komposit Peg-6000 dan Tio2
(Universitas Sumatera Utara, 2024)Research has been conducted on the synthesis and characterization of Phase Change Material based on PEG 6000 and TiO2 composite by sonication method. PEG 6000 is an organic PCM that has a high latent heat capacity to store ...