Faculty of Mathematics and Natural Sciences: Recent submissions
Now showing items 101-120 of 11443
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Pemodelan Prevalensi Stunting di Indonesia Menggunakan Metode Regresi Nonparametrik Spline Truncated (Studi Kasus: Data BPS Tahun 2023)
(Universitas Sumatera Utara, 2025)Regression analysis is a statistical method used to determine the pattern of relationship between one variable and another. When the shape of the regression curve is unknown, nonparametric regression is used. One approach ... -
Sistem Otomatis Pemotong Daun dan Akar Bawang Merah Kering Berbasis Deteksi Tekanan dan Ketebalan
(Universitas Sumatera Utara, 2025)This study aims to develop an automatic system for cutting dry shallot leaves and roots based on pressure and thickness detection technology, as a solution to the limitations of manual cutting methods commonly used by ... -
Pendeteksian Gas Amonia (NH3) di Lahan Persawahan Berbasis Internet of Things (IoT) dan Dampaknya Terhadap Kesehatan Masyarakat di Daerah Pangkalan Susu
(Universitas Sumatera Utara, 2025)When nitrogen fertilizer is used in agricultural activities, ammonia gas (NH3) emissions increase, which has a negative impact on the health of the surrounding community. The purpose of this research is to develop an NH3 ... -
Sintesis dan Karakterisasi Nanokomposit Zn0.9Co0.1Fe2O4/Karbon Aktif Ampas Kopi dengan Metode Hidrotermal sebagai Material Elektroda Superkapasitor
(Universitas Sumatera Utara, 2025)This study, mesoporous Zn0.9Co0.1Fe2O4 (ZnCoF) and coffee grounds activated carbon (CGAC) particles have been synthesized as materials to obtain supercapacitors that have high performance. The synthesis process was carried ... -
Penggunaan Kitosan Kulit Udang Putih (Litopenaeus Vannamei) untuk menurunkan Kadar Logam Ai Dan Mn Pada Air Sungai Di Kawasan Tembung
(Universitas Sumatera Utara, 2025)Heavy metal pollution such as aluminum (Al) and manganese (Mn) in water can have negative impacts on the environment and human health. Chitosan has active amino (NH2) and hydroxyl (OH) groups, which are able to adsorb ... -
Rancang Bangun Sistem Kontrol Lampu Sein dan Lampu Hazard Otomatis Sepeda Motor Menggunakan Sensor Gyroscope MPU6050 dan Sensor Proximity Induktif
(Universitas Sumatera Utara, 2025)Traffic accidents in Indonesia remained a serious problem, particularly those involving motorcycles as the primary mode of transportation. One of the main causes was riders’ negligence in properly using turn signals when ... -
Sintesis Basa Schiff melalui Reaksi Kondensasi Selulosa Dialdehida dari Tandan Kosong Kelapa Sawit dengan Metilamina Sebagai Wet Strength Agent
(Universitas Sumatera Utara, 2025)This study examines the synthesis of Schiff bases through the condensation reaction of cellulose dialdehyde from empty palm bunches with methylamine as a wet strength agent. Cellulose dialdehyde was obtained from the ... -
Perbandingan Performa Algoritma K-Means dan DBSCAN dalam Clustering pada Data Berdimensi Tinggi
(Universitas Sumatera Utara, 2025)Clustering is one of the essential techniques in data analysis for discovering hidden patterns and grouping data based on certain similarities. However, the application of clustering algorithms to high-dimensional data ... -
Sintesis Selulosa Dialdehida Dari Tandan Kosong Kelapa Sawit Sebagai Wet Strength Agent
(Universitas Sumatera Utara, 2025)Cellulose isolation from empty palm fruit bunches (EPFB) was conducted by adding 3.5% HNO3, 2% NaOH, and 1.75% Na2SO3, NaOCl, 10% H2O2. 18.160 g of cellulose was obtained. The cellulose was oxidized using NaIO4 with a ratio ... -
Sintesis dan Uji Fotokatalitik Komposit ZnO/CuO Berbasis Ekstrak Daun Teh Hijau (Camellia sinensis) untuk Degradasi Methylen Blue (MB)
(Universitas Sumatera Utara, 2025)In this study, the synthesis, characterization, and analysis of a ZnO/CuO composite photocatalyst based on green tea leaf extract were successfully carried out. The ZnO/CuO composite was synthesized using a green ... -
Pembuatan dan Karakterisasi Papan Komposit Diperkuat Serat Bemban (Donax canniformis) dan Serbuk Kayu Jati (Tectona grandis L.f.) dengan Resin Epoksi
(Universitas Sumatera Utara, 2025)The fabrication of composite boards made from bemban fibers and teak wood powder using epoxy resin was carried out as an alternative composite material. The bemban fibers used were approximately 1 cm in length, and the ... -
Perancangan dan Aplikasi Sistem Aerator Otomatis Tenaga Surya Berbasis Internet of Things pada Budidaya Ikan Air Tawar
(Universitas Sumatera Utara, 2025)This study presented the development of an automatic aerator system based on the Internet of Things (IoT) and powered by solar energy, which was designed to improve water quality in freshwater aquaculture. The system ... -
Analisis Pengaruh Suhu terhadap Kinerja Sensor Optik pada Alat Pendeteksi Mikroplastik Berbasis IoT: Studi pada Sungai Deli Medan
(Universitas Sumatera Utara, 2025)Water temperature plays a crucial role in influencing the physical properties of microplastics in aquatic ecosystems. This research investigates how temperature fluctuations affect the response of optical sensors in an ... -
Perancangan dan Pembuatan Alat Pendeteksi Mikroplastik Berbasis IoT Menggunakan Sensor Optik Photodioda BPW34
(Universitas Sumatera Utara, 2025)Microplastics are plastic particles smaller than 5 mm that have become one of the main pollutants in water bodies. The Deli River in Medan City is one of the areas affected due to high domestic waste and poor waste management. ... -
Rancang Bangun Peralatan Sistem Informasi Cuaca Terintegrasi Website Berbasis Internet of Things Menggunakan Esp32 di Daerah Objek Wisata Pantai Bali Lestari
(Universitas Sumatera Utara, 2025)This study designs an IoT-based weather information system at Pantai Bali Lestari using ESP32 and various sensors to read temperature, humidity, air pressure, light intensity, and rain. Data is sent to the server via XAMPP ... -
Pengaruh Suhu Karbonisasi terhadap Karakteristik Adsorben Karbon Aktif Kulit Pisang Kepok untuk Reduksi Salinitas Air Laut
(Universitas Sumatera Utara, 2025)Research on adsorbent based on activated carbon from banana peel to reduce seawater salinity has been conducted. Banana peel was carbonized at 350°C, 400°C, and 450°C for 90 minutes. Banana peel carbon was sieved with a ... -
Pembuatan Karbon Aktif dari Tongkol Jagung dengan Aktivator Asam Sulfat (H2SO4) untuk Penyerapan Logam Mangan (Mn) pada Air Sumur Bor
(Universitas Sumatera Utara, 2025)The increase in industrial development often results in waste, chemicals, or leaks from factory infrastructure that have the potential to contaminate groundwater and compromise the quality of water from bore wells. In ... -
Isolasi dan Identifikasi Golongan Senyawa Flavonoida dari Kulit Batang Tumbuhan Ceremai (Phyllanthus acidus (L.) Skeels)
(Universitas Sumatera Utara, 2025)The cherry plant (Phyllanthus acidus (L.) Skeels) is one of the herbs that has the potential as a medicine. One of the bioactive compounds that plays a role in this is flavonoids. Isolation and identification of flavonoid ... -
Studi Pengaruh Konsentrasi Na-CMC pada Karakteristik Fisikokimia dan Elektrokimia Elektroda Hibrida CNT/NiCo2O4 sebagai Material Superkapasitor Fleksibel
(Universitas Sumatera Utara, 2025)The demand for flexible and environmentally friendly energy storage devices continues to grow alongside the development of wearable electronics. Supercapacitors have emerged as one of the most promising candidates due to ... -
Sintesis Fe3O4/ZIF-8 dari Pasir Besi untuk Adsorpsi Logam Pb(II): Studi Pengaruh Variasi pH Larutan terhadap Kapasitas Penyerapan Adsorben
(Universitas Sumatera Utara, 2025)The rapid rate of population growth is accompanied by the intensification of human activities, especially in the industrial sector. Increased industrial activity leads to high production of toxic pollutants that can ...