Faculty of Mathematics and Natural Sciences: Recent submissions
Now showing items 561-580 of 11437
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Pemanfaatan Powder Porang dan Serat Kulit Jagung dengan Penambahan Magnesium Stearat dan Polivinil Alkohol pada Pembuatan Biofoam
(Universitas Sumatera Utara, 2024)This research has been conducted to make biofoam with porang flour, corn fiber and magnesium stearate with the addition of polyvinyl alcohol variations of 40%, 50%, and 60%. The stages in this research start from making ... -
Pengaruh Variasi Penambahan Zat Aditif TiO2/ZnO dan Lilin Lebah (Beeswax) Terhadap Karakteristik Bioplastik Alginat-CMC-Sorbitol
(Universitas Sumatera Utara, 2024)The manufacture of alginate-CMC-sorbitol bioplastics and the manufacture of alginate-CMC-sorbitol-Beeswax bioplastics (Beeswax) with the manufacture of alginate-CMC-sorbitol bioplastics with TiO2/ZnO additives has been ... -
Pembuatan Bahan Biomaterial Berbasis Hidroksiapatit Limbah Cangkang Kerang Kepah (Polymesoda Erosa) dengan Metode Presipitasi Double Stirring dan Karakterisasinya
(Universitas Sumatera Utara, 2024)Research has been carried out on the synthesis of hydroxyapatite-based biomaterials from the shell waste of crab shells (Polymesoda Erosa) in the Belawan Mangrove Forest area which aims to synthesize hydroxyapatite (HAp) ... -
Sintesis Dan Karakterisasi Komposit Termoplastik Berbasis Lignin Tergrafting Polistirena Dengan Metode Polimerisasi Radikal Transfer Atom
(Universitas Sumatera Utara, 2024)This research examines the synthesis process and characterization of lignin-based thermoplastic composites grafted with polystyrene. This research was carried out to combine the two properties of lignin and polystyrene ... -
Isolasi dan Identifikasi Golongan Senyawa Flavonoida dari Buah Turi Merah (Sesbania grandiflora (L.) Poir)
(2024)Isolation of flavonoida compounds contained in red turi fruit (Sesbania grandiflora (L.) Poir) had been carried out by maceration extraction method using methanol solvent. The methanol concentrated extract was then ... -
Adsorpsi Zat Warna Congo Red menggunakan Adsorben Berbahan Dasar Pati Sagu dan Karboksimetil Selulosa Menurut Persamaan Langmuir dan Freundlich
(Universitas Sumatera Utara, 2024-12-30)Research on adsorbents from sago starch and carboxymethyl cellulose with aluminum sulfate and boric acid cross-binding agents applied to the adsorption of congo red dye. This study aims to determine the equilibrium time ... -
Evaluasi Penggunaan Komposit Selulosa Asetat/Karbon Dots sebagai Bahan Pelepasan Obat
(Universitas Sumatera Utara, 2024)Composite materials of cellulose acetate with Carbon Dots (CDs) offer significant potential as efficient drug delivery systems. This study evaluates cellulose acetate/CDs (CA/CDs) composites as drug release materials by ... -
Automorfisma Graf Barbel
(Universitas Sumatera Utara, 2024)The automorphism of a graph G is a permutation of the set of points V(G) of the graph G which is neighborhood preserving. In other words, the automorphism of a graph G is an isomorphism of the graph G to itself. One of the ... -
Sintesis 2-Etilheksil Oleat dari Esterifikasi 2-Etilheksil Alkohol dan Asam Oleat pada Perbandingan Rasio Molar dan Berat Enzim Lipase Menggunakan Radiasi Mikrowave
(Universitas Sumatera Utara, 2024)Synthesis of 2-Ethylhexyl Oleate from oleic acid and 2-ethylhexyl alcohol through esterification reaction using lipase enzyme as catalyst and microwave radiation has been conducted. The reaction conditions carried out in ... -
Pembuatan 2-Etilheksil Oleat dari Esterifikasi 2-Etilheksil Alkohol dan Asam Oleat pada Perbandingan Waktu Reaksi dan Daya Mikrowave Menggunakan Katalis Enzim Lipase
(Universitas Sumatera Utara, 2024)The production of 2-Ethylhexyl Oleate from oleic acid and 2-Ethylhexyl alcohol has been performed through esterification reaction using lipase enzyme as catalyst and microwave radiation. The parameters studied in this ... -
Pemodelan Volatilitas Harga Saham GGRM dengan Pendekatan Generalized Autoregressive Conditional Heteroskedasticity (GARCH)
(Universitas Sumatera Utara, 2024)This research aims to obtain the best model for the stock data of PT Gudang Garam Tbk. (GGRM) based on AIC and BIC values. The study utilizes secondary data from the Investing website, using daily stock data of GGRM for ... -
Pembuatan Hidrogel Komposit Alginat- Nanokristal Selulosa yang Diisolasi dari Kulit Durian (durio zibethinus) dan Diperkuat oleh Mangan Dioksida untuk Adsorpsi Metilen Biru
(Universitas Sumatera Utara, 2022)Research on cellulose nanocrystal-based composite hydrogel isolated from durian peel has been successfully carried out. The cellulose nanocrystals were further modified into composite hydrogels. Where the composite hydrogel ... -
Fabrikasi Kawat Superkonduktor MgB2 melalui Proses Pengerolan Panas dengan Selubung Baja Tahan Karat dan Variasi Filling Density Serbuk dalam Tabung
(Universitas Sumatera Utara, 2022)Variations in filling density of powder in the tube were carried out to study its on phase, microstructure and superconductivity of MgB2. Raw materials in the form of Mg powder (98.5 % purity, Merck) and amorphous B (95 ... -
Analisis Apoptosis Jalur Ekstrinsik pada Karsinoma Sel Skuamosa Rongga Mulut Tikus (Rattus norvegicus) dengan Pemberian Nanoherbal Sikkam (Bischofia javanica) dan Mahkota Dewa (Phaleria macrocarpa)
(Universitas Sumatera Utara, 2024)Oral squamous cell carcinoma (OSCC) is a common type of cancer in the head and neck region, particularly prevalent in Southeast Asia due to the consumption of tobacco with betel and areca nuts. In tobacco, Benzo(alpha)pyrene ... -
Reformulasi Kuadratik Konveks Kuat dengan Metode Faktorisasi Berulang pada Program Polinomial Integer Campuran
(Universitas Sumatera Utara, 2024)This paper discusses solving Mixed-integer Polynomial Programs through convex quadratic reformulation. This quadratic reformulation is carried out using the factorization method. This method works by factoring high degree ... -
Karakterisasi Barium Heksaferite dan Pasir Besi sebagai Material Penyerap Gelombang Mikro
(Universitas Sumatera Utara, 2024)This study aims to analyze the characteristics of Barium Hexaferrite and iron sand as microwave absorbing materials, their effects on microwave absorption properties, and the frequency range of waves produced by the material. ... -
Perencanaan Jaringan Nirkabel dengan Ketidakpastian Permintaan
(Universitas Sumatera Utara, 2012)An optimal planning of future wireless networks in fundamental to satisfy ris- ing traffic demands jointly with the utilization of sophisticated techniques, such as OFDMA. Current method for this task require a static ... -
Modifikasi Aspal dengan Karet Alam Reaktif: Fungsionalisasi Karet Alam dengan Maleat Anhidrat (MA), Glisidil Metakrilat (GMA) untuk Meningkatkan Kinerja Aspal
(Universitas Sumatera Utara, 2024)Natural rubber biopolymer has the potential to be used as an additive in the manufacture of polymer modified asphalt or rubber asphalt. This study aims to synthesize a reactive polymer based on natural rubber (SIR-20) ... -
Model Hidden Markov untuk Menyajikan Hubungan Koordinasi Perkembangan Perilaku Pembelajaran di Era Reformasi Industri
(Universitas Sumatera Utara, 2024)School Communities interact dynamically in a school system, therefore they can be considered as agents in a Multi-Agent System. It is known that the need to manage relationships between agents in a multi-agent system is ... -
Monitoring dan Analisis Kualitas Udara di Beberapa Wilayah Kota Medan yang Terintegrasi Berbasis IoT
(Universitas Sumatera Utara, 2024)The background of this research is the importance of monitoring air quality in the industrial and non-industrial areas, especially in Medan, Indonesia. The growth of the industrial sector and the increased use of ...