Faculty of Mathematics and Natural Sciences: Recent submissions
Now showing items 141-160 of 11100
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Rancang Bangun Kendali Nutrisi untuk Peningkatan Efisiensi Tanaman Hidroponik Berbasis Internet of Things (IoT)
(Universitas Sumatera Utara, 2024)As the area of agricultural land continues to decrease while the human population increases, the demand for food also rises in parallel. There is a need for planting techniques that do not use soil as a growing medium. ... -
Implementasi Sistem Pemantauan Batuk dengan Sensor Suara dan Akselerometer Berbasis Internet of Things (IoT)
(Universitas Sumatera Utara, 2024)Chronic respiratory diseases, have a significant impact on global health, especially in developing countries. Coughing is a major symptom that plays a role in the diagnosis and transmission of TB. This study aims to design ... -
Pengaruh Komposisi Fe3O4 pada Phase Change Material (PCM) Berbasis Peg 6000-Getah Damar
(Universitas Sumatera Utara, 2024)Phase change material (PCM) compositions based on PEG 6000, Fe3O4, resin, and SDBS by sonication method at 80 ° C frequency 40 kHz was prepared. The composition variations of the mass used are 2%Damar : 98%PEG6000, 2%Fe3O4 ... -
Implementasi Fuzzy Time Series Markov Chain untuk Peramalan Inflasi
(Universitas Sumatera Utara, 2024)The Fuzzy Time Series Markov Chain method has the ability to manage complex and unstable Time Series data, and provide more accurate predictions by minimising forecasting errors. In this study, the Fuzzy Time Series Markov ... -
Analisis Tail Value at Risk Pada Saham Blue Chip dengan Pendekatan Copula Gaussian
(Universitas Sumatera Utara, 2024)When doing investments, investors usually want high returns with low risk. However, the fact that often occurs is that high profits are obtained with high risk (high return high risk), and vice versa. Therefore, to help ... -
Peningkatan Aktivitas Fotokatalitik Zno Termodifikasi N-Doped Carbon Dots Biji Asam Jawa (Tamarindus Indica L.) dalam Mendegradasi Metilen Biru
(Universitas Sumatera Utara, 2024)The rapid development of the textile industry sector is an environmental problem that causes pollution by liquid dye waste such as methylene blue (MB) dye. Therefore, effective efforts are needed to reduce MB levels, namely ... -
Pembuatan dan Karakterisasi Karbon dari Cangkang Kepiting Bakau (Sylla Serrata) sebagai Remediasi Logam Fe pada Air Sumur
(Universitas Sumatera Utara, 2024)Research has been conducted on the manufacture and characterization of carbon from mangrove crab (Sylla Serrata) shell waste as a remediation of Fe (iron) metal in well water. Carbon preparation was carried out through ... -
Sintesis dan Karakterisasi Phase Change Material Berbasis Komposit Peg-6000 dan Zno
(Universitas Sumatera Utara, 2024)This study aims to determine and analyze the synthesis and characterization of PEG-6000 based Phase Change Material with the addition of ZnO. The raw materials used are PEG 6000, ZnO and Sodium Dodecyl Benzene Sulfonate ... -
Penerapan Regularisasi Lasso dan Ridge dalam Mengatasi Masalah Multikolinearitas pada Matriks Kovarians
(Universitas Sumatera Utara, 2024)The covariance matrix is a relationship measure of how far two or more random variables vary together. In the context of modelling and processing more complex data, the covariance matrix can experience very high multicollinearity ... -
Pembuatan Nanoserat Selulosa Tongkol Jagung Sebagai Bahan Bioplastik Dengan Plasticizer Sorbitol
(Universitas Sumatera Utara, 2024)Research has been conducted on bioplastics made from cellulose nanofibers from corn cobs and chitosan with sorbitol plasticizer, varying the ratio of cellulose nanofibers and chitosan at 30%:70%; 40%:60%; 50%:50%; 60%:40%; ... -
Analisis Kepuasan Menggunakan Regresi Logistik Ordinal di Sonatine Piano Pematang Siantar
(Universitas Sumatera Utara, 2024)Ordinal logistic regression is used to analyze the relationship between ordinal scaled dependent variables and independent variables. In this study, ordinal logistic regression is applied to determine the factors that ... -
Isolasi dan Identifikasi Golongan Senyawa Flavonoida dari Kulit Batang PohonTrembesi (Samanea Saman (Jacq.) Merr)
(Universitas Sumatera Utara, 2024)Isolation and identification of flavonoid compound groups from the bark of rain tree (samanea saman (jacq.) Merr) had been carried out through the stages of maceration extraction using methanol solvent. Extraction was ... -
Potensi Khamir Endofit Buah Markisa (Passiflora Edulis) Penghasil Asam Indol Asetat Dan Pelarut Fosfat
(Universitas Sumatera Utara, 2024)Endophytic yeast is a unicellular fungus whose their life cycle in tissues such as intercellular spaces of plants and does not cause damage to its host. Their ability in secreting of phytohormone and dissolving of phospates ... -
Studi Etnoprimatologi Kukang (Nycticebus Coucang) di Desa Kuta Male Kecamatan Kutambaru Kabupaten Karo Sumatera Utara
(Universitas Sumatera Utara, 2025)The misuse of slow lorises, such as their use as mystical tools or as pets, is particularly prevalent in Kuta Male Village, Karo Regency, North Sumatra. Therefore, it is necessary to conduct research regarding the perspectives ... -
Kajian Model Dinamik Predator-Prey untuk Keberlanjutan Tumbuhan terhadap Gangguan Herbivora
(Universitas Sumatera Utara, 2024)The Holling Type II functional response in this study is used to analyze the interaction between plants as prey and herbivores as predators. The mathematical model utilized is based on the extended Lotka-Volterra equations ... -
Kajian Metode Analisis Spektral pada Peramalan Curah Hujan
(Universitas Sumatera Utara, 2024)Spectral analysis can be used to reveal periodic patterns contained in rainfall data. Data analysis using statistical tools and spectral analysis is applied to investigate and interpret the temporal course of the available ... -
Penaksiran Parameter Distribusi Weibull Menggunakan Maksimum Likelihood dan Ant Colony Optimization
(Universitas Sumatera Utara, 2024)Maximum Likelihood is a commonly used statistical method to estimate the parameters of probabilistic models. Ant Colony Optimization is a heuristic method that performs search in optimization using a system of ... -
Isolasi dan Identifikasi Golongan Senyawa Flavonoida dari Kulit Batang Landoyung (Litsea Cubeba (Lour.) Pers.)
(Universitas Sumatera Utara, 2024)Isolation and identification of flavonoid compound groups from landoyung bark (Litsea cubeba (Lour.) Pers.) had been carried out through maceration extraction stages with methanol solvent. The methanol extract was concentrated ... -
Isolasi dan Identifikasi Golongan Senyawa Flavonoida dari Kulit Batang Mahang Damar (Macaranga Triloba (Thunb.) Mull.Arg.)
(Universitas Sumatera Utara, 2024)Isolation and identification of flavonoid compounds from stem bark of mahang damar (Macaranga triloba (Thunb.) Mull.Arg.) had been carried out. Isolation was carried out through maceration extraction using methanol and was ... -
Isolasi dan Identifikasi Golongan Senyawa Flavonoida dari Daun Mahang Biru (Macaranga Heynei I. M. Johnst)
(Universitas Sumatera Utara, 2024)Isolation and identification of the flavonoid compound from mahang biru (Macaranga heynei I. M. Johnst.) leaves had been done by maceration extraction technique with methanol solvent. Methanol solid extract was re extracted ...