Faculty of Mathematics and Natural Sciences: Recent submissions
Now showing items 1041-1060 of 11354
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Sintesis Karbon Aktif Sekam Padi Sebagai Filter Logam Besi (Fe) dan Tembaga (Cu) pada Air Sumur
(Universitas Sumatera Utara, 2023)In this study, activated carbon was synthesized using the calcination method as an absorber for iron (Fe) and copper (Cu) metals in previously investigated well water. The activated carbon was derived from rice huks waste ... -
Alat Kontrol Pemupukan Otomatis Portable Berbasis Sensor NPK dan Sensor Konduktivitas Listrik Tanah Terintegrasi IoT
(Universitas Sumatera Utara, 2023)Success in crop cultivation activities can be determined by various factors. One of the factors that determine success is fertilisation. Fertilisation mainly depends on macronutrients, such as Nitrogen (N), Phosphorus (P) ... -
Pemberian Pakan Serbuk Daun Bangun-Bangun (Coleus Amboinicus) Terhadap Pertumbuhan dan Kelangsungan Hidup Ikan Patin (Pangasius Hypophthalmus)
(Universitas Sumatera Utara, 2022)Feeding of leaf bangun-bangun (Coleus amboinicus) on the growth and survival of catfish (Pangasius hypophthalmus) has been carried out at the Natural Resources and Environmental Processing Laboratory, Department of Biology, ... -
Pengaruh Kombinasi Ekstrak Etanol Daun Pegagan (Centella Asiatica L.) dan Daun Sirsak (Annona Muricata L.) Terhadap Luka Sayat pada Mencit
(Universitas Sumatera Utara, 2023)The study was conducted from January 2023 to May 2023 to analyze the effect of giving a combination of ethanol extracts of gotu kola leaves and soursop leaves on wound closure in animal models of mice. The study was organized ... -
Analisis Faktor yang Mempengaruhi Prestasi Belajar Siswa ditinjau dari Cara Belajar saat Pandemi Covid 19 dengan Metode Structural Equations Model (SEM) (Studi Kasus: SMAN 2 Tanjung Balai Kelas X)
(Universitas Sumatera Utara, 2022)The education system in Indonesia is experiencing new challenges due to a virus outbreak Covid-19,which causes the entire learning system of education instituted transferred to an online orlearning online methods.The ... -
Implementasi Regresi Logistik dengan Machine Learning pada Kasus Titanic Survivors Problem
(Universitas Sumatera Utara, 2022)The sinking of the Titanic is one of the most famous events in history. Due to an insufficient number of lifeboats for all the people on board, this resulted in 1,502 deaths out of the total 2,224 passengers and crew ... -
Pengaruh Variasi Suhu Pembakaran Terhadap Karakterisasi Keramik Berpori Berbasis Tanah Lempung (Clay) dan Abu Ampas Tebu
(Universitas Sumatera Utara, 2023)The purpose of this study was to ascertain how temperature variation affected the structural characteristics of porous ceramics. The materials used were clay and bagasse ash. The die pressing method was used to create ... -
Efek Nanoherbal Rhodomyrtus Tomentosa (Aiton) Hassk. Terhadap Fungsi Kognitif Belajar dan Memori Mus Musculus L. Berdasarkan Step Through Passive Avoidance
(Universitas Sumatera Utara, 2024)Learning and memory are complex cognitive functions. Memory functions in encoding, storing, and retrieving information which is then stored into short-term memory and long-term memory. This study aims to analyze the effect ... -
Jenis – Jenis Tumbuhan Paku (Pteridophyta) di Kebun Raya Sipirok Kabupaten Tapanuli Selatan Sumatera Utara
(Universitas Sumatera Utara, 2023)Sipirok Botanical Garden is one of the conservation areas in North Sumatra that has a diversity of flora and fauna, one of which is ferns. The study of ferns at Sipirok Botanical Garden had not been done so that the types ... -
Rancangan dan Alat Ukur Monitoring Tekanan Berbasis Internet of Things (Iot) untuk Mengetahui Penyumbatan pada Filter
(Universitas Sumatera Utara, 2023)A tool for detecting filter blockages in pipes using an IoT (Internet of Things) based pressure sensor has been successfully designed and can carry out serial communication between Arduino and Nodemcu. This tool uses a ... -
Analisis Vegetasi dan Biomassa Pohon di Kebun Raya Sipirok Kabupaten Tapanuli Selatan Sumatera Utara
(Universitas Sumatera Utara, 2023)Sipirok Botanical Garden, South Tapanuli Regency, North Sumatra has a forest area estimated to have high diversity and carbon stocks. The purpose of this study was to analyze the structure and composition of vegetation and ... -
Sintesis dan Karakterisasi Pakan Ternak Ruminansia Berbahan Dasar Tanaman Indigofera Zollingeriana Menggunakan Metode Fermentasi Em 4
(Universitas Sumatera Utara, 2023)This research was conducted to make ruminant feed pellets using Indigofera Zollingeriana as a concentrate and additional ingredients such as coconut pulp, rice bran, molasses, cassava, and EM 4. The purpose is to find ... -
Pembuatan dan Karakterisasi Beton Polimer Menggunakan Zeolit Alam Pahae Dengan Resin Polyester Serta Serat Kulit Jagung Sebagai Filler
(Universitas Sumatera Utara, 2023)Research has been conducted on polymer concrete with sand aggregate and natural zeolite pahae and corn husk fiber as filler using hotpress at 170 oC for 30 minutes. with the aim to determine the effect of reducing zeolite ... -
Sintesis dan Karakterisasi Pakan Ternak Ruminansia Berbahan Dasar Bungkil Inti Sawit (Palm Kernel Cake) Menggunakan Metode Fermentasi Em 4
(Universitas Sumatera Utara, 2023)This study aims to determine the effect of the addition of cassava as an adhesive and the use of palm kernel meal as a concentrate and the addition of other ingredients on the physical properties, mechanical properties, ... -
Efektivitas Karbon Aktif Tempurung Pala dalam Menurunkan Kadar Amonia (Nh3) Pada Air Kolam Ikan
(Universitas Sumatera Utara, 2023)Research on nutmeg shell activated carbon as a water adsorber aims to reduce ammonia levels in fish pond water. The process of making nutmeg shell activated carbon starts with nutmeg shell dried in the sun for 3 hours and ... -
Sintesis Metil Oleat dengan Menggunakan Katalis H2SO4 dan Alat Pendispersi Homogen pada Suhu Ruang
(Universitas Sumatera Utara, 2023)Synthesis of methyl oleate from esterification of oleic acid with methanol using H2SO4 catalyst and homogeneous dispersing apparatus at room temperature has been carried out based on three parameters, namely, the molar ... -
Keanekaragaman Makrofauna Tanah Pada Areal Perkebunan Kelapa Sawit yang tidak dan diberi Limbah Cair Pabrik Kelapa Sawit Sebagai Pupuk
(Universitas Sumatera Utara, 2023)The diversity of animals is influenced by the presence of dangerous chemicals in the soil. Chemicals can cause various problems, one of which causes the extinction of soil macrofauna types. This research was conducted to ... -
Keanekaragaman Genetik Durian (Durio zibethinus Murr.) dari Kecamatan Angkola Timur Kabupaten Tapanuli Selatan Berdasarkan Morfologi dan Simple Sequence Repeats (SSR)
(Universitas Sumatera Utara, 2023)Durian is one of tropical fruit that is very popular and has a high economic value in Indonesia. Tapanuli Selatan Regency is one of the production centers for durian (Durio zibethinus Murr.) in North Sumatra. One of the ... -
Sintesis Natrium Selulosa Sulfat dari Tandan Kosong Kelapa Sawit Melalui Reaksi Sulfasi Pada Variasi Pelarut Etanol, Isopropanol, dan 1-Butanol
(Universitas Sumatera Utara, 2023)Isolation of α-cellulose was carried out by adding 3.5% HNO3, 2% NaOH and 2% Na2SO3, 1.75% NaOCl, 17.5% NaOH and 10% H2O2, α-cellulose was obtained at 18.167 g (24.22% of initial weight). Synthesis sodium cellulose sulfate ... -
Sintesis Metil Ester Asam Lemak dari Minyak Jelantah Melalui Tahapan Reaksi Amidasi dan Reaksi Transesterifikasi Menggunakan Peralatan Pendispersi Homogen
(Universitas Sumatera Utara, 2023)The synthesis of fatty acid methyl esters from waste cooking oil was carried out by amidation reaction with monoethanolamine and transesterification reaction using homogenizer. The amidation reaction was carried out on ...