bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Study of Sedimentation at Jongkong Reservoir in District Central of Bangka through Erosion of Catchment Area
Authors: Maini Miskar , Mashuri  
Published: August 2020

Abstract
Jongkong reservoir creates a reservoir of water that is used for the purposes of raw water as fundamental media for improvement of drinking water production especially at dry season for the District of Koba. The advantage of being able to hold water in wet season and releasing it in dry season will be detained if the life storage of the reservoir can be utilized effectively, but sedimentation problem will decrease its volume which can influence the life time of reservoir. Finally the reservoir becomes less effective, so it is very important to study. The method which is used to predict an average erosion rate in the catchment area considers factors of rain erosivity, soil erodibility, ground inclination of slope or slope length, management of crop and land, soil conservation. Calculation was done by using the USLE equation (Universal Soil Loss Equation) which was developed by Wischmeier and Smith (1965, 1978). From this research result, the prediction of surface erosion rate in the basin catchment area in the year 2019 is equal to 53.20 mm/year or equivalent with 62,491.92 m3/year, and the value of Sediment Delivery Ratio (SDR) is equal to 32,28 %. The number of material which eroded is equal to 957.59 Ton/Ha/year so it is classified into the medium erosion class category. The dead storage of 5% of the the volume of the reservoir cage will be fully charged in the year 2022 or for 3 The next year and the total volume of the reservoir Ridge will be full of sediment in the year 2062 or 43 years.
Photoionization model of Novae V5668 Sgr based on Optical Spectroscopic Observations at Bosscha Observatory
Authors: Muztaba Robiatul , Malasan Hakim L. , Arai Akira 
Published: August 2020

Abstract
Novae V5668 Sgr spectra that have been observed at Bosscha Observatory on June 12, June 23 and August 15, 2015 using the NEO-R1000 spectrograph attached to the C-11 telescope showed that it has been entered the nebular phase. We will present the results of photoionization modelling using CLOUDY from observations of the Novae V5668 Sgr. The results of this modelling show that the spectrum profile matches fairly to the observations. Emission line features such as Hα, [O I] λ 6300, 6364 Å, [O II] λ 7320 Å, [O III] λ 5007 Å, [N II] λ 5755 Å, and Fe II λ 4924, 5169, 5317, 6149 Å on the observed spectra are also well formed and represented by the model.
Identification Distribution of Hot Spring in Cisarua Using Magnetic Method
Authors: Santoso Nono Agus , Rizki Reza , Hakim Rendra Aditya , Ashuri Wijayanti 
Published: August 2020

Abstract
Lampung is one of the provinces which have hot spring resource. One of the unique hot springs in Lampung is Cisarua hot spring. Its location is far from volcanic which makes researcher curious with the system of hot spring from Cisarua. Based on the geology map, the location of hot spring is in Lampung Panjang Fault. The aim of this research is to know about type, zone and distribution of hot spring. The method used in this research is magnetic method with combined geochemistry. From geochemical analysis, the type of hot spring in Cisarua is bicarbonate water. It correlates with outflow and shallow zone. Based on 3D modelling of low magnetic anomaly, distribution of hot water is in Center and Southeast research area. Hot water is interpreted by low anomaly.
Expected Characteristics and Features of a Decision-Making Framework for Infrastructure Project Selection: A Structured Thematic Analysis of Interview Data
Authors: Hansen Seng , Too Eric , Le Tiendung 
Published: August 2020

Abstract
As the largest economy in Southeast Asia, Indonesia faces various challenges in accelerating infrastructure development. One of these challenges is related to the selection of infrastructure projects that are increasingly stringent considering the continuing growth of infrastructure projects. This paper focuses on issues related to the development of a Decision-Making Framework (DMF) for infrastructure project selection. In order to develop a good DMF, expected characteristics and features must be understood. Thus, this paper aims to identify these expected DMF characteristics and features through a qualitative approach. Twenty semi-structured expert interviews were conducted and analysed based on a structured thematic analysis to identify four key DMF characteristics and three groups of DMF features. These identifications are an important effort in developing a DMF so that it can be fully utilized and well-functioned. Finally, this paper reflects the current expectations in developing a good DMF for infrastructure project selection.
Study of aerosol content based on spectrophotometric observations: A comparison with long-term extinction profile from photometric observations
Authors: Malasan Hakim L , Prabowo D A , Adhyaqsa A , Rabbani M Rafif , Puspitarini Lucky , Aprilia  
Published: August 2020

Abstract
Spectroscopic observations of standard stars (spectrophotometric) have been carried out at Bosscha Observatory ITB (latitude= 6°49′28″ S, longitude= 107°36′56″ E, altitude=1310 m) using the Celestron C-11 reflector (D=11 inches, F/10.0), equipped with NEO R-1000 spectrograph (Resolution of 1000), and ST-8XME CCD camera to deduce total atmospheric extinction curve. Spectrograms were reduced with the long-slit task in the Image Reduction and Analysis Facility (IRAF). The total extinction curve obtained from observation is decomposed into three main components, i.e. Rayleigh scattering, Ozone and water vapor absorptions, and extinction by aerosol. The extinction profile by Aerosol serves as an important indication on size and distribution of particulates as the main constituent of atmospheric pollutant. This pollutant can be resulted from natural process or anthropogenic activities. The behavior of atmospheric extinction over Bosscha Observatory based on long-term astronomical photometric database (1982-1993) was previously studied by one of us in 1993. In this study we analyze new data and study the dynamics of atmosphere by comparing our recent result with that from long-term photometric observations to indicate variation of degree of atmospheric turbidity, particulate size and its distribution over the atmosphere. We recommend that long-term regular based spectrophotometry at an Observatory is imperative as an effective means to gain our insight on atmospheric dynamic.
Measuring Staff Availability in Public Transport: The Case Study of Tyne and Wear Metro
Authors: Chairuasni I R 
Published: August 2020

Abstract
Despite its importance, the definition of staff availability and the components affecting staff availability are still unclear for public transport users. This paper investigates how public transport users define staff availability and the elements related to it. The case study for this paper is Tyne and Wear Metro. The method chosen in this paper was the focus group discussion to give more in-depth explanations from users. The focus group discussions generated keywords, which then are analyzed by its recurrence and emphasis. Based on the findings, this paper has found the definition of staff availability as the combined attributes of staff presence and quality. This paper also has identified the components of staff availability, and the most significant element is staff presence.
Determination of Slip Surface Using 2D Geoelectric Resistivity Method and Laboratory Analysis for Landslide Prone Area Pesawaran, Lampung
Authors: Permanasari Ikah N P , Ipmawan Vico L , Khairuman Endi 
Published: August 2020

Abstract
Padang cermin sub district is the only access to beach tourism in Pesawaran District, which is the main tourist destination in Lampung. Along Padang cermin road consists of cliffs and hills that are vulnerable to landslides. so it is necessary to study the vulnerability of landslides in the area. 2D geoelectric measurements have been carried out in the Padang cermin area to find out the resistivity values that can be used to determine the land that makes up the slope and the skid plane. From the measurement results it is found that in the Padang cermin area there are five layers of soil in a row namely clay, clay sand, Alluvium, Sandstones and limestone. Slip surface area is at the boundary between the fourth and fifth layers at a depth of 39m.
Application 4D Resistivity Method for Determining Effect of Water Content; Case Study ITERA Campus
Authors: Rizka  , Satiawan Soni , Saputra Hendra 
Published: August 2020

Abstract
This is a study of the application of the time lapse resistivity method (4D resistivity) to analyze the dynamics of the movement of subsurface fluids (ground water). This study used to analyze the decline in the ground water table due to differences in the rainy and dry seasons. The 4D resistivity study was conducted at the ITERA campus in June (rainy season) and September (dry season). The resistivity method used Electrical Resistivity Tomography (ERT) with the Wenner Alpha configuration. Data acquisition uses 36 simultaneous channel with ARES Multichannel and Multielectrode resistivity meters instrument with length is 385 meters. Based on the first measurement (rainy season), it was found an unconfined aquifer layer with a moderate resistivity value (11 – 80 Ω.m) which was assumed to be tuffaceous sandstone at a depth of 11 – 35 m. Whereas in the second measurement (dry season), it was found an unconfined aquifer layer with a moderate resistivity value (11 - 80 Ω.m) which was assumed to be tuffaceous sandstone at a depth of 11-28 m. Based on the results of time lapse inversion processing, it is found that the change in resistivity for the two sets of data almost the same at all measurement points, except at certain points, which shows a greater percentage. This shows the change in resistivity values if measured at different times. This difference is due to the absorption of rainwater by the surface which then migrates into the inner layer.
Urban Gravity Measurements for the Subsurface Mapping; Case Study Kaliawi
Authors: Rizka  , Agustina Lea Kristi , Mazmuloh Hot 
Published: August 2020

Abstract
Gravity method is a passive geophysical method that can measure and obtain subsurface models based on rock density. Gravity method can be done in urban areas to obtain information about subsurface model as a reference in making urban policies related to disaster mitigation and urban development based on earth potential. Gravity research was conducted in Kaliawi, Bandar Lampung. Kaliawi has many problems including dense settlements and slums, areas prone to floods and landslides and has limited availability of fresh water. Based on the Complete Bouguer Anomaly results, the western area of Kaliawi has a low anomaly (36.8 – 38.2 mGal) with lithology of sandy-clay sedimentary rocks. Whereas the eastern area of Kaliawi has a high anomaly (38.4 – 40.8 mGal) with tuff lithology and can be bedrock. Based on the gravity anomaly and lithology, the western area of Kaliawi is a landslide area and recharge area while the eastern area of Kaliawi is good for settlement because it has bedrock.
The Diversity, Distribution and Feeding Guild of Mammals and Birds in Institut Teknologi Sumatera (ITERA) Landscape
Authors: Tohir Rizki Kurnia , Sitanggang Fajar Islam , Sutiawan Riki 
Published: August 2020

Abstract
ITERA was established in 2014 and caused a landscape conversion from a rubber plantation into a construction area. Changes in a landscape usually affect wildlife biodiversity such as mammals and birds. The objective of this research is to identify and to determine the diversity, distribution, and feeding guilds of mammal and bird species. A survey of mammals and birds in the ITERA landscape has conducted between April and September 2019. This research used line transect and trapping method for mammals. The combination of point count and transect method used for birds observation. ITERA Landscape divided into six transects. This research found three species mammals belonging to three families. C. notatus only found in rubber stands. 67% of terrestrial mammals and all feeding guilds are omnivorous. This research found 814 encounters of birds consisting of 28 species belonging to 18 families. Species with the highest dominance are Lonchura punctulata, and the dominant family is Ardeidae. Elanus caeruleus and Ardea alba are a protected species which stated in Indonesia regulation. The transect that has the highest species richness is transect 6 with 22 species, and transect 1 with 21 species. The highest stratification used for foraging of birds community is terrestrial, and the highest feeding guild is insectivorous.
Identification of Permeability Level by using Fault Fracture Density Analysis and Landsat 8 OLI at Ulubelu Geothermal Area
Authors: Iqbal M , Juliarka B R 
Published: August 2020

Abstract
Ulubelu geothermal field is located approximately 125 km at the west of Bandar Lampung, Lampung Province. Currently, the Ulubelu geothermal prospect has been developed as a geothermal power plant with 220 MW installed capacity. Ulubelu geothermal field began to operate since 2012 with the first capacity of 3x55 MW which has a temperature of 265°C with 1,160 kg/kJ average enthalpy and developed as water dominated system with single flash system technology. This research analyzes fault fracture density in the area to study the area which can potentially have high permeability or fracture by using remote sensing data (digital elevation map) to delineate the lineaments which can be observed at Ulubelu and surrounding. This research is also used Landsat 8 OLI data to determine the vegetation level of the Ulubelu area. The result of the analysis shows that there are three potential areas to be the recharge area, west of Mt. Pematang Sulah, west of Mt. Rendingan, and north of Mt. Rendingan. The recharge area should be preserved to maintain the geothermal system in the Ulubelu area.
Usability Evaluation of KAI Access Application
Authors: Didin Fatin Saffanah , Valentino Fandy 
Published: August 2020

Abstract
The Government of Indonesia develops some distribution of transportation especially land transportation, i.e. train. This transportation only available in Java Island, but now available in Sumatra Island. The existence of this train was supported by the development of the Industry 4.0 which is train tickets purchased by Applications that can minimize cash payment, increasing the efficiency and effectiveness of customers. User ratings for KAI Access Application on Google Playstore is not good enough, there are still a lot of users who give complaints and bad ratings on this Application. From the data, there is a usability issue in this application. The purpose of this research is to evaluate KAI Access application with a usability approach in Sumatera Island which can be used as a basis for Increase performance of KAI Access application after comparing with Java Island users. This evaluation using a usability approach with the System Usability Scale (SUS) questionnaire, mapping complaints and task completion time for user performance. The result of this research are alternatives to improve this application such as redesign interface for home page and improvement of the database. Positive correlation is found between type of user (novice and expert) and origin of user (Java and Sumatra) where results show significant difference.
Design Methods of Detecting Atrial Fibrillation Using the Recurrent Neural Network Algorithm on the Arduino AD8232 ECG Module
Authors: Soaduon Simanjuntak Jonathan Eprilio , Khodra Masayu Leylia , Tosima Manullang Martin Clinton 
Published: August 2020

Abstract
Atrial fibrillation (AF) is part of a type of heart disease characterized by a rhythmic irregular heartbeat. AF conditions that occur continuously can potentially cause a stroke for sufferers. The method of reading and detecting the possibility of AF is needed to prevent the risk of stroke due to AF. In this research, the Recurrent Neural Network (RNN) method is used in classifying electrocardiogram readings to obtain accuracy in the assessment of AF. The data information used in the study was obtained from physicians who were the bases of ECG result image data, and data information was also obtained by implementing directly through a simple and low-cost ECG using Arduino AD8232 to test user information directly related to AF conditions at the user’s heart. RNN method that is tested can obtain more accurate accuracy values in detecting AF heart rate abnormalities, and the Arduino AD8232 module can be a good ECG in reading low-cost but high-accuracy heart records.
Recommendation System for Wedding Service Organizer using Content-Boosted Collaborative Filtering Methods
Authors: Kesuma Rahman Indra , Iqbal Amirul 
Published: August 2020

Abstract
The utilization of smartphones that grow continuously is as a result of the changing lifestyle from the peoples in the growing digital world era. This condition can be seen on the large penetration of smartphones in half of the world society. The high smartphones utilization can increase the chance of many businesses, especially in online businesses that are used for promotions and transactions. The efficient and effective process become the main issues in technology development. One example is to meet the needs of wedding services in online business, which most users still have difficulties or need more time in finding the product as desired. Therefore, a recommendation system concept is applied in this research that is able to help the process of product promotion or searching specifically related to new products and involve new users. The content-boosted collaborative filtering method is used in these systems that is implement two previous methods, namely content-based that is used to form a full product rating matrix by a user, while collaborative filtering is used to make recommendations. Based on the experimental results that the system can recommend with 69% accuracy and helpful especially for newly added items or newly registered users.
Design of Energy Harvesting System Based on Building Integrated Photovoltaic at Academic Building ITERA
Authors: Friansa Koko , Asri Rishal , Rozana Monna , Soelami FX Nugroho 
Published: August 2020

Abstract
In this paper, a solar energy harvesting with the integrated grid system is designed at rooftop of Academic Building Institut Teknologi Sumatera (ITERA; latitude: -5.360091, longitude: 105.315441). The produced energy from solar energy harvesting in yearly was simulated using PVSyst. The solar energy harvesting consists of a photovoltaic array with nominal power 136 kWp and inverter system with nominal power 120 kWac. Total of producing useful energy 3.4 kWh/kWp/day. The energy loss in this system was reported due to the temperature effect, photovoltaic module quality loss, and inverter loss. The total of energy loss from an energy harvesting system reached 1.06 kWh/kWp/day. The performance ratio was found to be 0.763.
Modeling Photovoltaic System on Parking Area Using East-West Racking
Authors: Asri Rishal , Friansa Koko 
Published: August 2020

Abstract
Parking lots are land that is always available in every building or office. There are only a small number of parking lots in the educational institution that has a top or roof cover that can protect parked vehicles such as rain and sun. The parking lot can be used to become a solar ground mount. This study uses satellite imaging and modelling in buildings to measure the potential of the energy produced. Solar PV in the parking lot in this study has an energy potential of 370.6 MWh per year, with the number of PV modules installed 818. Energy generated from solar PV in the parking lot can be used to support activities in the surrounding area.
Design Bluetooth Low Energy for Battery and Photovoltaic Monitoring at Solar Powered Street Lamp System
Authors: Friansa Koko , Iqbal Amirul , Rozana Monna 
Published: August 2020

Abstract
In this paper, we designed an electrical power monitoring system for PV, batteries, and lamps at solar powered street lamps based on wireless sensor network (WSN) system using Bluetooth Low Energy. The power monitoring system is low-cost and open platform technology. The WSN used tree and linear topologies for data transmission and both in terms of the type of sensors and the number of sensor nodes. The distance between sensor nodes about 40 m as standard of street lamp. The network design used 2 chains in tree topology and each chain have 5 hop or nodes. The WSN at solar powered street lamps is well suited for a wide variety of applications related to environmental monitoring, because solar powered street lamps spread into remote areas and use solar energy as a main power source.
Comparison of Solar Tracking and Solar Fix Mode on the Efficiency Electric Energy Generation Based on Microcontroller
Authors: Corio Dean , Ramadian Alvino , Sahlendar Asthan Rheyuniarto , Maria Ulfah Mia 
Published: August 2020

Abstract
A Solar tracker is a device that is powered by solar panels motors, aiming to adjust the position of the panel with the movement of the sun so that energy can be absorbed optimally. This study will compare the use of solar panels and solar trackers fix the model, so on getting the efficiency of each system. The test site is on the campus of the Institute of Technology of Sumatra. Prototype solar tracker is controlled using a microcontroller Arduino, ethernet shield as a liaison Arduino with local networks that can be connected to the web, the stepper motor is used as a driver, is equipped with a voltage sensor, current sensor, the sensor LDR (Light Dependent Resistor) for parameter tracking the sun, solar charge controller as control the charging and battery as energy storage. Parameter solar energy tracker and fix displayed realtime models consist of the reading of voltage, current, and power in the form of a graph on a web monitoring. Calculation of energy that can be generated a model of solar tracker is the difference between the energy stored in the battery is reduced by the energy to activate the motor driver, so we get solar tracker models to use efficiency as compared to fixed models.
The effect of citric acid on chemical and physical characteristics of andaliman (Zanthoxylum acanthopodium) chili paste in retort packaging
Authors: Pangastuti H A , Permana L , Fitriani V , Mareta D T , Wahyuningtyas A 
Published: August 2020

Abstract
Andaliman chili paste is a condiment made from andaliman (Zanthoxylum acanthopodium) that widely consumed as traditional food in North Sumatera, Indonesia. With the aim to improve the shelf life of the products, this research was done as a preliminary evaluation to understand the effect of citric acid concentration to chemical and sensory characteristics of andaliman chili paste packed in retort. The study design was completely randomized design with three citric acid concentration, such as 0,1%; 0,3%; and 0,5% (b/v) with chili paste without citric acid as a control. The chemical and physical properties measured were moisture content, pH, water activity, and color. The result showed that addition of citric acid did not significantly affected (P > 0.05) pH and water activity. However, it revealed that moisture content and color parameter were significantly different (P < 0.05) among all the samples.