Judul: Modeling Human Movement in the Spread of Covid-19 Using the Modified Graph PageRank Algorithm (Case Study: East Java Province)
Abstrak: Covid-19 merupakan penyakit menular yang disebabkan oleh SARS-CoV-2. Pada 1 Mei 2021, Provinsi Jawa Timur merupakan salah satu provinsi dengan tingkat penyebaran dan kematian Covid-19 paling tinggi di Indonesia. Penelitian ini akan memodelkan pergerakan manusia dalam kaitannya dengan penyebaran Covid-19 di Provinsi Jawa Timur dengan menggunakan 22 variabel demografi, sosial, dan ekonomi untuk menggambarkan aktivitas manusia dan karakteristik wilayah. Algoritme Modifikasi Graph PageRank akan menghitung nilai PageRank untuk setiap variabel dengan nilai koefisien yang menunjukkan besaran pengaruh dari masing-masing variabel (dilambangkan dengan β). Penelitian ini menunjukkan bahwa variabel produk domestik regional bruto, jumlah penduduk laki-laki, tingkat pengangguran, jumlah kejahatan, kepadatan penduduk, dan angka melek huruf memberikan pengaruh terhadap pergerakan manusia dalam kaitannya dengan penyebaran Covid-19 di Provinsi Jawa Timur dengan nilai koefisien korelasi sebesar 0,867., Covid-19 is an infectious disease caused by SARS-CoV-2. As of May 1st, 2021, East Java Province is one of the provinces with the highest spread and mortality rates of Covid-19 in Indonesia. This study will model human movement in the spread of the Covid-19 in East Java Province by using 22 demographic, social, and economic variables to describe human activities and regional characteristics. The Modified Graph PageRank Algorithm will calculate the PageRank score for each variable with a coefficient value that indicates the magnitude of the influence of each variable (denoted as β). This study shows that gross regional domestic product, male population, unemployment rate, crime rate, population density, and literacy rate variables have an influence on human movement in the spread of Covid-19 in East Java Province with a correlation coefficient of 0.867.
Keyword: Covid-19, East Java, Human Movement, Modified Graph PageRank

Judul: Modeling Human Movements Effect on the Spreading of COVID-19 using Modified Epirank Algorithm on Railway Transportation in the Jabodetabek Area
Abstrak: Pada Desember 2019, sebuah coronavirus baru ditemukan di kota Wuhan, Cina yang mengakibatkan sekelompok kasus pneumonia dan peningkatan jumlah infeksi terus berlanjut di Cina dan secara global. Virus ini kemudian dinamakan SARS-Cov-2 dan penyakit yang disebabkan dinamakan COVID-19. Penyakit COVID-19 dapat menyebar dengan cepat dikarenakan cara penyebaran yang sangat mudah, yaitu melalui cairan pernapasan, dan tersebar ketika ada interaksi fisik dengan orang yang terinfeksi. Salah satu penyebab utama interaksi fisik adalah pergerakan manusia, karenanya memetakan pergerakan manusia dianggap penting untuk mempelajari penyebaran virus ini. Penelitian ini akan memodelkan pergerakan manusia yang terjadi di unit spasial yaitu kota/kabupaten pada jaringan wilayah Jabodetabek. Tujuannya adalah untuk melihat pengaruh pergerakan manusia terhadap penyebaran Penyakit COVID-19. Pemodelan pengaruh pergerakan manusia akan dibuat menggunakan algoritme EpiRank., In December 2019, a previously unknown coronavirus was discovered in the city of Wuhan, China, which has a collection of pneumonia cases and an increase in the number of human infections in China and globally. This virus was later called SARS-Cov-2 and the disease caused was called COVID-19. The reason behind the massive scale of COVID-19 disease spreads is because of how easily it is transmitted, namely through droplets and / or by airborne transmission when there is a physical interaction with an infected person. One of the main causes of physical interaction is human movement, that is why mapping human movement is considered important as an effort to study the spreading of this virus. This study will be focusing on how to create human movement models that occur in spatial units, namely cities / regencies in the existing spatial network in the Jabodetabek area. This study aims to see the effect of human movement on the spread of the COVID-19 disease. The human movement model will be created using the EpiRank algorithm.
Keyword: COVID-19, EpiRank, human movement, spatial model, model spasial, pergerakan manusia

Judul: Sintesis dan Pencirian Natrium Titanat (Na2Ti2O4(OH)2) Berbahan Dasar Titanium Dioksida
Abstrak: TiO2 can be utilized as basic material for synthesis of sodium titanate (Na2Ti2O4(OH)2). This research was purposed to synthesize and characterize sodium titanate from TiO2 rutile powder as a basic material. Sodium titanate was synthesized by hydrothermal process at temperature 130 °C by mixing TiO2 rutile powder with 5 M and 10 M NaOH solution, then each was calcinated at temperature 700 °C. The energy dispersive X-ray analysis showed that sodium titanate has been successfully synthesized. This result was also supported by functional group analysis with Fourier transform infrared (FTIR) spectrofotometer showing the existence of Ti-O-Na vibration band at 989.42 cm-1. The formation of sodium titanate was depend on the reaction condition such as temperature, reaction time, and NaOH concentration. Scanning electron microscope image indicated that sodium titanate synthesized at 130 °C in 20 hours reaction time with 10 M NaOH had crystal size of 99.37 nm.
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