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Jurnal Sains dan Teknologi

JST
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Published by Universitas Pendidikan Ganesha

ISSN : 23033142 EISSN : 25488570 DOI : -

Core Subject : Science, Education,

Computer Science & IT Education

Jurnal Sains dan Teknologi(JST) is a journal aims to be a peer-reviewed platform and an authoritative source of information. We publish original research papers, review articles and case studies focused on Mathematic, Biology, Physic, Chemistry, Informatic, Electronic and Machine as well as related topics. All papers are peer-reviewed by at least two referees. JST is managed to be issued twice in every volume.

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Search results for , issue "Vol. 10 No. 2 (2021)" : 21 Documents clear

KOMBINASI PENGGUNAAN KOMPOS ECENG GONDOK (Eichhornia crassipes) DENGAN PUPUK KANDANG AYAM TERHADAP LAJU PERTUMBUHAN BIBIT TANAMAN KOPI ROBUSTA (Coffea canephora) Lukman, Lukman; Kusrianty, Nelly
JST (Jurnal Sains dan Teknologi) Vol. 10 No. 2 (2021)
Publisher : Universitas Pendidikan Ganesha

Penelitian ini bertujuan untuk menentukan dosis pupuk bokashi eceng gondok yang ditambahkan dengan pupuk kandang terhadap laju pertumbuhan bibit kopi robusta.. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) yang terdiri dari 6 taraf perlakuan yaitu : g0 = kontrol (tanpa pemberian bokashi eceng gondok), g1 = 0,6 kg bokashi eceng gondok + 1 kg tanah, g2 = 0,8 kg bokashi eceng gondok + 1 kg tanah, g3 = 1 kg bokashi eceng gondok+ 1 kg tanah, g4 = 1,2 kg bokashi eceng gondok + 1 kg tanah, g5 = 1,4 kg bokashi eceng gondok + 1 kg tanah. Setiap perlakuan di ulang sebanyak 3 kali sehingga terdapat 18 unit percobaan dan setiap unit terdiri dari 5 bibit kopi, populasi seluruhnya adalah 90 bibit kopi dan semuanya dijadikan sebagai tanaman sampel. Hasil penelitian menujukkan bahwa dosis 1,4 kg/polybag merupakan dosis yang terbaik yang mempunyai pertumbuhan rata-rata tinggi tanaman 26,50 cm, lebar daun 5,23 cm, jumlah daun 11,47 helai, diameter batang 4,30 mm dan volume akar 6,73 ml. Hasil penelitian dapat disimpulkan bahwa kombinasi kompos eceng gondok dengan pupuk kandang ayam sangat baik digunakan untuk pertumbuhan bibit tanaman kopi robusta. Kata kunci : Kopi robusta, bokashi, ecenggondok, pupukkandang dan pertumbuhan.

PROTEASE ACTIVITY OF THERMOPHILIC BACTERIA FROM LEJJA HOT SPRINGS IN SOPPENG SOUTH SULAWESI Hafsan, Hafsan; Ramadani, Kurnia; Abbas, Abbas
JST (Jurnal Sains dan Teknologi) Vol. 10 No. 2 (2021)
Publisher : Universitas Pendidikan Ganesha

This research aimed to observe quantitatively the effect of temperature and pH on protease activities from thermophilic bacteria collected from Lejja—Hot springs. Spectrophotometry on the casein substrate was used to test the proteolytic activity of the crude protease. Mixtures of enzyme and casein were incubated at various temperatures and pH for 20 minutes. The absorbance of tyrosine from protein hydrolysis was determined by spectrophotometry on λ 280 nm. Temperature and pH impacted on protease activity were determined at temperature (60; 65; 70; 75; 80; 85 and 90oC) and pH (6.0; 6.5; 7.0; 7.5; 8, 0; 8,5 and 9,0). Results showed that treatment of temperature variations and pH had a significant effect on protease activity. Crude extract of Bacillus licheniformis protease showed that the highest activity at 80oC and pH 7.5 was 0.1303 unit/ml/minute. Bacillus stearoformis showed the highest enzymatic activity of the protease at 85oC, and pH 7.5 was 0.1226 Unit/ ml/minute. In comparison, Bacillus coagulans reached optimum activity at 75oC, and pH 7.5 was 0.2052 Unit/ml/minute. Isolates of Bacillus licheniformis, B. coagulans and B. stearoformis are bacteria that produce thermostable protease enzymes that can be developed as a source of genes and as a producer of the enzyme itself.

PENERAPAN POLINOMIAL ORDE-N DAN MALTHUSIAN PADA STUDI KASUS KAJIAN DAYA TAMPUNG WISATAWAN Dalengkade, Mario Nikolaus; Yusniar, Masitah; Tjape, Willyam; Boleu, Fiktor Imanuel; Buka, Oktosea
JST (Jurnal Sains dan Teknologi) Vol. 10 No. 2 (2021)
Publisher : Universitas Pendidikan Ganesha

Terletak di kawasan timur Indonesia, Tobelo Kabupaten Halmahera Utara terkenal dengan keindahan alamnya. Mamuya adalah destinasi wisata pemandian air panas yang memiliki keindahan alam. Pemandian air panas ini selalu ramai dikunjungi wisatawan lokal. Tapi pada faktanya destinasi mamuya belum dikelola berdasarkan ekologi. Luaran analisis menunjukan y=-0.179x^6+7.086x^5-109.0x^4+824.1x^3-3176x^2-5756x-2832 dengan R2 = 0.793. Fungsi tersebut merepresentasikan kunjungan wisatawan, setiap bilangan yang bernilai positif mengindikasikan penambahan wisatawan. Sedangkan bilangan negatif merupakan kebalikan dari positif. Analisis daya dukung destinasi mamuya yakni 606.25 wisatawan per tahun sedangkan populasi maksimum kunjungan menyentuh angka 737.15 wisatawan per tahun. Data ini mengindikasikan terjadinya kelebihan kapasitas di kawasan wisata.

PREDIKSI POTENSI SISWA PUTUS SEKOLAH AKIBAT PANDEMI COVID-19 MENGGUNAKAN ALGORITME K-NEAREST NEIGHBOR Darmayanti, Irma; Subarkah, Pungkas; Anunggilarso, Luky Rafi; Suhaman, Jali
JST (Jurnal Sains dan Teknologi) Vol. 10 No. 2 (2021)
Publisher : Universitas Pendidikan Ganesha

The implementation of the PSBB has an impact on all sectors, one of which is education, namely the threat of children dropping out of school. Dropouts explain that every student or student who leaves school or other educational institutions for any reason before finishing school without moving to another school. Early prediction must be done, to prevent many students dropping out of school. The dataset used in this study was taken from students in Junior High School (SMP) in Banyumas Regency. The method used in this study is the confusion matrix and 10-fold cross validation on the K-Nearest Neighbors (KNN) algorithm. The results obtained on the KNN algorithm in predicting the potential for dropout students are 87.4214%, with a precision value of 88.2%, recall 87.4% and F-Measure 87%. Then the results of the accuracy value on the KNN algorithm are categorized as Good Classification

ANALYSIS OF PHYTOCHEMICAL SUBSTANCE AND THE EFFECT OF CANG SALAK TEA (CST) DIET TO LIPID PROFILE ON HYPERLIPIDEMIC RAT Karta, I Wayan; Burhannuddin, Burhannuddin; Kartawidjajaputra, Felicia
JST (Jurnal Sains dan Teknologi) Vol. 10 No. 2 (2021)
Publisher : Universitas Pendidikan Ganesha

The bark of Sibetan snakefruit (Salacca zalacca) and sappan wood (Caesalpinia sappan L.) are combined into the product of Cang Salak Tea (CST). This tea is expected to be useful for diseases associated with dyslipidemia. The purpose of this study was to examine the secondary metabolites in CST and to determine the effect of CST treatment on the lipid profile of total cholesterol (TC), triglyceride (TG), HDL, and LDL level. Wistar rats were divided into three groups: control group (K), hyperlipidemic rats group given CST (P1), and hyperlipidemic rat group without CST treatment. Group P1 was given CST as much as 1.2 mL per day for 4 weeks. CST contains alkaloid, flavanoid, tannin, phenol, and saponine. Flavonoid level about 81.026 ppm; tannin 525.706 ppm, IC50 177.689 ppm, and phenol 622.7844 ppm. There were significant differences in the lipid profile of K and P1 with P2. CST treatment to hyperlipidemic rats can reduce total cholesterol and normalize level of TG, HDL, and LDL. The active substance in CST has role in lipid metabolism, so it can improve the lipid profile of hyperlipidemic rats.

ANALISIS KUALITAS AIR DI PERAIRAN DANAU TOBA KECAMATAN PANGURURAN, KABUPATEN SAMOSIR Silaban, Winarto; Silalahi, Mastiur Verawaty
JST (Jurnal Sains dan Teknologi) Vol. 10 No. 2 (2021)
Publisher : Universitas Pendidikan Ganesha

Lake Toba is a lake located in Samosir Regency, North Sumatra Province with a surface area of 1,124 km2 (112,400 ha). Lake Toba is located at a geographical position 2°41′N 98°53′E / 2.68°N 98.88°E with an altitude of 995 above sea level. The purpose of this study was to determine water quality in terms of chemical, physical, and biological parameters, as well as the status of water quality in Lake Toba. Determination of the sample point using the "sample survey method" which is the method of taking the sample by dividing it into several segments or points that can represent the population. The method used in this study is a descriptive method with a quantitative approach. Based on the results of the study, it can be concluded that the quality of the waters of Lake Toba in Pangururan District is classified as not good, specifically nitrate, nitrite, and ammonia concentration. Those that are classified as good are temperature, pH, BOD5, O2, and COD. Water quality in Lake Toba is in the category of polluted lightly. Using biological analysis, Lake Toba waters in Pangururan District contain several phytoplankton, including Oocystis sp and Anabaena Sp.

RANCANG BANGUN ALAT PINTAR PROTOKOL KESEHATAN COVID-19 TERINTEGRASI Santoso, Yosef Karuna; Jonatan, Jeany Johana; Millenika, Prayudha; Fernanda, Denis Aditya; Setyawan, Iwan; Susilo, Deddy
JST (Jurnal Sains dan Teknologi) Vol. 10 No. 2 (2021)
Publisher : Universitas Pendidikan Ganesha

COVID-19 merupakan penyakit pada manusia yang menyebabkan munculnya gejala-gejala seperti sesak napas, batuk, bersin, demam dan bahkan meninggal dunia. Guna mencegah terjadinya penularan akibat dari virus ini, perlu dilakukan penerapan protokol kesehatan yang ketat. Oleh karena itu untuk menekan adanya penyebaran COVID-19 ini maka diciptakan rancang bangun alat pintar penerapan protokol Kesehatan terintegrasi dimana di dalamnya mampu mendeteksi jaga jarak, mendeteksi masker, mendeteksi suhu tubuh dan mencuci tangan. Pada bagian jaga jarak digunakan metode moving average untuk mendeteksi adanya orang yang melakukan antrean di posisi yang salah atau tidak, pada bagian masker pengolahan data menggunakan metode convolutional neural network, bagian cek suhu menggunakan sensor suhu nirsentuh dan pencucian tangan dengan menggunakan waterpump yang tersambung dengan relay. Penerapan alat pintar protokol Kesehatan COVID-19 terintegrasi ini diharapkan mampu bermanfaat bagi masyarakat khususnya ditempat-tempat umum yang berpotensi timbulnya antrean. Alat ini telah mampu mencapai target keberhasilan diatas 90% secara keseluruhan.

UNDIKSHA VIRTUAL ASSISTANT (SHAVIRA): INTEGRATION FREQUENCY ASKED QUESTION WITH RASA FRAMEWORK Resika Arthana, I Ketut; Dewi, Luh Joni Erawati; Seputra, Ketut Agus; Marti, Ni Wayan
JST (Jurnal Sains dan Teknologi) Vol. 10 No. 2 (2021)
Publisher : Universitas Pendidikan Ganesha

Nowadays, the implementation of chatbots in information systems is getting popular to increase user experience. In our previous research, we developed Undiksha Virtual Assistant (Shavira). Shavira is a knowledge management system (KMS) as Frequency Asked Question (FAQ) system to facilitate users to get an answer about their questions. The challenge on the existing Shavira system is that the users must open a website and type queries to get a list of answers. The text query must match with the keyword in systems. To address this problem and to avoid cognitive load, in this research we implemented a chatbot in Shavira. The purpose of the chatbot implementation in Shavira is to make information easier to be accessed and to increase user experience. The users can ask a question in natural language and get an answer immediately on their chat application such as: Telegram, Facebook, or Messenger. We used Rasa Framework as a chatbot engine in Shavira. Rasa Framework is an open-source virtual assistant engine based on artificial intelligence. The challenge in conducting this research is in integrating the existing FAQ system with Rasa Framework. This research consists of four phases, they are: adaptation data structure in the existing FAQ with data structure requested by Rasa framework, data integration and mapper, and evaluation. The result of this research is a new Shavira that is integrated with a chatbot and can be accessed from chat applications such as Telegram. We evaluated the accuracy of Shavira powered by Rasa Framework with ten topics about academic information. The results showed that the accuracy of Shavira is 90%. We also evaluated the usability of Shavira with Software Usability Scale (SUS) Questionnaire. The usability evaluation showed that Shavira satisfied users with value 81 (threshold 68) and categorized Excellent, Acceptable and Prometer.

METODA FAST FORWARD UNTUK MEMPERCEPAT DINAMIKA KUANTUM ADIABATIK PADA SPIN TUNGGAL Benggadinda, Annisa; Setiawan, Iwan
JST (Jurnal Sains dan Teknologi) Vol. 10 No. 2 (2021)
Publisher : Universitas Pendidikan Ganesha

AbstrakPenelitian ini membahas metode percepatan dinamika kuantum adiabatik pada sistem spin tunggal yaitu dinamika spin yang bergerak pada keadaan awal up (atas) akan bergerak ke down (bawah) pada keadaan akhir. Metode ini disebut skema fast forward. Metode ini pertama kali di usulkan oleh Masuda dan Nakamura. Dalam metode ini, skema percepatan dibangun dengan menambahkan suku interaksi penggerak ke Hamiltonian awal dan mempercepatnya dengan menggunakan faktor penskalaan waktu yang bernilai besar dan parameter adiabatik yang menuju nol (0) dan bertujuan mewujudkan dinamika kuantum adiabatik pada waktu yang singkat dan dengan penambahan medan magnet penggerak. Hamiltonian penggerak dan medan magnet penggerak ini menjamin spin tunggal dapat bergerak dari keadaan awal ke keadaan akhir dalam waktu yang singkat tanpa mengubah karakteristik awalnya. Kata kunci: Adiabatik, Dinamika Kuantum, Spin tunggal AbstractThis study discusses the method of accelerating adiabatic quantum dynamics in a single spin system, namely the dynamics of a spin that moves in the up initial state will move down in the final state. This method is called a fast forward scheme. This method was first proposed by Masuda and Nakamura. In this method, the acceleration scheme is constructed by adding the driving interaction term to the initial Hamiltonian and accelerating it by using a large time scaling factor and adiabatic parameter towards zero (0) and aims to realize adiabatic quantum dynamics in a short time and by adding a driving magnetic field. The driving Hamiltonian and the driving magnetic field ensure that a single spin can move from its initial state to its final state in a short time without changing its initial characteristics. Keywords : Adiabatic, Quantum Dynamics, Single Spin

STRUKTUR KOMUNITAS IKAN TERUMBU KARANG PADA DAERAH PERLINDUNGAN LAUT DI PULAU SEBESI LAMPUNG Yudha, Firsta Kusuma; Yulianda, Fredinan; Yulianto, Gatot
JST (Jurnal Sains dan Teknologi) Vol. 10 No. 2 (2021)
Publisher : Universitas Pendidikan Ganesha

Daerah Perlindungan Laut (DPL) merupakan salah satu konsep pengelolaan ekosistem pesisir di Pulau Sebesi, yang dibentuk untuk menekan tingkat kerusakan terumbu karang di Pulau Sebesi. Salah satu indikasi kerusakan terumbu karang ialah kehadiran ikan terumbu karang yang memanfaatkan terumbu karang sebagai habitat untuk hidup. Penelitian ini bertujuan untuk mengidentifikasi struktur komunitas ikan terumbu karang pada Pulau Sebesi sebagai bahan pengelolaan DPL Pulau Sebesi. Secara keseluruhan ditemukan 493 individu ikan terumbu karang yang termasuk 12 famili ikan terumbu karang. Famili Pomacentridae merupakan famili dengan komposisi tertinggi pada seluruh lokasi studi. Kelimpahan ikan terumbu karang terbanyak dijumpai di Pulau Umang, sedangkan terendah dijumpai pada Gosong Sawo. Jumlah jenis ikan terumbu karang di lokasi studi berkisar antara 11-21 spesies. Indeks keanekaragaman tertinggi dijumpai pada Pulau Umang. Hal ini menandakan Pulau Umang memiliki kelimpahan dan jenis ikan terumbu karang yang lebih banyak dibandingkan lokasi lain.

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I Ketut Resika Arthana, S.T., M.Kom

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Contact Name
I Ketut Resika Arthana, S.T., M.Kom

Contact Email
resika@undiksha.ac.id

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Journal Mail Official
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Kota denpasar,

Bali

INDONESIA