bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Structure-from-Motion Pipeline for Generating Digital Elevation Models for Surface-Runoff Analysis
Authors: Meza Jhacson , Marrugo Andres G. , Ospina Gabriel , Guerrero Milton , Romero Lenny A. 
Published: June 2019

Abstract
Digital Elevation Models (DEMs) are used to derive information from the morphology of a land. The topographic attributes obtained from the DEM data allow the construction of watershed delineation useful for predicting the behavior of systems and for studying hydrological processes. Imagery acquired from Unmanned Aerial Vehicles (UAVs) and 3D photogrammetry techniques offer cost-effective advantages over other remote sensing methods such as LIDAR or RADAR. In particular, a high spatial resolution for measuring the terrain microtopography. In this work, we propose a Structure from Motion (SfM) pipeline using UAVs for generating high-resolution, high-quality DEMs for developing a rainfall-runoff model to study flood areas. SfM is a computer vision technique that simultaneously estimates the 3D coordinates of a scene and the pose of a camera that moves around it. The result is a 3D point cloud which we process to obtain a georeference model from the GPS information of the camera and ground control points. The pipeline is based on open source software OpenSfM and OpenDroneMap. Encouraging experimental results on a test land show that the produced DEMs meet the metrological requirements for developing a surface-runoff model.
Obtaining ZrN, ZrO, ZrC powder in a nitrogen atmosphere by means of a Ball Mill
Authors: Jaimes-Ochoa CJ , Quintero J.H. , Ospina R. 
Published: June 2019

Abstract
Properties such as thermal insulation, excellent structural and chemical stability, resistance to high temperatures make the zirconium compounds, their oxides and nitrides are of great interest to the scientific community. In the present work, the production of ZrN, ZrO and ZrC from a highly energetic ball mill is experimentally studied. The synthesized powders were characterized by X-Ray Photoelectron Spectroscopy and Scanning Electron Microscopy. The spectra performed demonstrate the ZrN, ZrO and ZrC formation, in addition the images obtained by SEM show a considerable increase in the size of the particles, since initially they were at 100 nm and were obtained in the order of 250 nm.
Search for ferroelectricity in fluoroperovskites: comparison between LiNiF3 and NaNiF3
Authors: Garcia-Castro A. C. , Quintero J. H. , Romero A. H. 
Published: June 2019

Abstract
Employing first-principles calculations, we have investigated the possible existence of the ferroelectric instability in the G-type antiferromagnetic NaNiF3 and LiNiF3 fluoroperovskites. The behavior of the unstable modes, at the cubic high-symmetry structure, is studied as a function of pressure. This study shows the vibrational landscape and define the conditions to drive the ferroelectricity in these materials, where the A-site dominates the polar instabilities.
A Kerr magnetometer setup in the kHz regime based on open-hardware architecture
Authors: Arroyave MA , Marín Ramírez JM , Campillo G , López JH , Arnache OL , Osorio J 
Published: June 2019

Abstract
A high sensitivity Kerr magnetometer (ΔI/I = 1/30) is presented, making use of open source hardware and software. By making time resolved measurements (up to 0.15 s/cycle) the signal quality has been greatly improved up to an order of magnitude, enabling us to compare our measurements with commercial vibrating sample magnetometers. We also present an additional setup to amplify the Kerr signal in a 25:1 scale, cleaning a large part of the electronic and trigger noise.
Density functional theory studies of the adsorption of Cr (VI) on Fe-(hydr) oxide: Gibbs free energies and pH effect
Authors: Acelas N Y , Flórez E 
Published: June 2019

Abstract
Adsorption of chromium (VI) on iron oxides is a potential removal method from industrial wastewater. Cr (VI) is a toxic specie for human health due to its easy mobility in the environment. Currently, US EPA drinking water standards establish a maximum Cr level of 100 μg/L. Since the adsorption process occurs in the solid/liquid interface, pH is one of the main factors that affect this process and it is a very important parameter to study. Understanding the adsorption process and the molecular geometries of complexes, is essential to predict the environmental transport of Cr (VI) and to develop appropriate models for the remediation of Cr (VI). Therefore, in this work, we describe the adsorption of Cr (VI) onto Fe-hydr (oxides) through computational methods. A complete characterization of the adsorbed surface complexes was performed, and three different pH conditions were simulated (acidic, intermediate and basic). It was found that, the thermodynamic favourability of the different adsorbed complexes was directly related to the pH. Bidentate complex (BB) was the most thermodynamically favourable complex with an adsorption energy of -143.3 kJ/mol under acidic pH conditions.
Monitoring and analysis of air quality for community empowerment in Environmental Health
Authors: Camilo Ordoñez Cristian , López Jennyfer , Guañarita Héctor A. , Armando Ordoñez José 
Published: June 2019

Abstract
The emission of greenhouse gases has increased dramatically. Among these, carbon monoxide (CO) has been identified as having the greatest negative impact on human health. These gases are produced mainly by human activities and, therefore, can be reduced if some community actions are carried out. This type of action is known as community empowerment and can be defined as active Participation of the community to achieve common objectives. The first step for empowerment is to know the magnitude of the problem, however, in the case of environmental monitoring, the price of the monitoring devices can be prohibitive. In this research, an air quality-monitoring platform based on the Internet of Things (IoT) is proposed. This platform uses Low-cost devices such as Arduino and Raspberry to measure the air quality in the center of Popayan city. The information is collected, processed and shared with the community through an app. The early results show an impact in the community perception. Also to the lessons learned, can be used to other low-cost developments.
Time temperature indicators (TTIs) based on silver nanoparticles for monitoring of perishables products
Authors: Lanza G A , Perez-Taborda JA , Avila A 
Published: June 2019

Abstract
This work presents the results of the production and characterization of silver nanoparticles (AgNPs) to applications in Time Temperature Indicators (TTIs). AgNPs were synthetized by chemical processes. The suspensions (AgNPs in water) were characterized for different temperatures (4°C and 22°C) and time (0 to 5h). The AgNPs were characterized by energy dispersive X-ray spectrometry (EDS), UV–vis spectrophotometry and dynamic light scattering (DLS). AgNPs with diameters between 40 to 160nm were produced. The UV-Vis spectra reveal a characteristic absorption peak of the Ag in 420nm. This suspension shows shifts in the emission wavelength when exposed to room temperature compared to when exposed to a temperature of 4°C for different periods of time. Δλ = 20nm in the absorption spectra were found. Size distribution showed that the nanoparticles size decreases from 164 ±8 nm to 44±3 nm in the period of time studied. Suspension with nanoparticles concentration of 1,26· 10-10 M were obtained. TTIs manufactured with nanomaterials base its operation on the variations of the characteristics of nanoparticles suspended due to absorbing heat.
The relationship of atmospheric air temperature and dew point temperature to extreme rainfall
Authors: Bui Andrew , Johnson Fiona , Wasko Conrad 
Published: June 2019

Abstract
To understand the expected changes of extreme rainfalls due to climate change, the sensitivity of rainfall to surface temperature is often calculated. However, as surface temperatures may not be a good indicator of atmospheric moisture, an alternative is to use atmospheric temperatures, but the use of atmospheric temperatures lacks precedent. Using radiosonde atmospheric temperature data at a range of geopotential heights from 34 weather stations across Australia and its territories, we examine whether atmospheric temperature can improve our understanding of rainfall-temperature sensitivities. There is considerable variability in the calculated sensitivity when using atmospheric air temperature, while atmospheric dew point temperature showed robust positive sensitivities, similar to when surface dew point temperature measurements were used. We conclude atmospheric dew point temperature may be a promising candidate for future investigations of empirically calculated sensitivities of rainfall to temperature but does not appear superior to the use of surface dew point temperature measurements.
Analysis of bamboo mechanical properties as construction eco-friendly materials to minimizing global warming effect
Authors: Yasin I , Priyanto A 
Published: June 2019

Abstract
Burning fossil fuels increases the amount of carbon dioxide in the atmosphere. Carbon dioxide is the main cause of the greenhouse effect and global warming. Climate change causes an increase in the number of human deaths due to diseases and natural disasters. In general, in the past decade there has been deforestation of 13 million ha / year. The highest deforestation rates (> 3.4 million ha / year) occur in South America and Africa while in Asia also experience deforestation in many places. Bamboo forests are very important especially in East and Southeast Asia as well as in Africa. The potential of bamboo is very large in controlling soil erosion, water conservation, land rehabilitation and carbon sequestration. In carbon sequestration bamboo contributes very significantly. The use of bamboo as an environmentally friendly construction material is very important to do. Testing of bamboo mechanical properties based on ISO 3129-1975 standards, which includes testing of fiber parallel compressive strength, parallel fiber shear strength, fiber parallel tensile strength and straight fiber tagak flexural strength. Setting-up testing is carried out after each specimen in the condition of the kiln dry water content is in the range 12-13% according to the requirements of the ISO 3129-1975 standard. Analysis of variants (Anova) of pressure treatment on bamboo material has an effect on some of the mechanical properties of bamboo. Pressure treatments up to 2.5 MPa have a significant effect on the elastic modulus, tensile strength and shear strength of bamboo while the compressive strength is not significantly affected by the pressure treatment of bamboo material. Bamboo forests have a big influence in reducing the impact of global warming and climate change.
Problem analysis on the work cycle of occupational safety and health management system in manufacturing industry
Authors: Ratnawati Dianna , Setuju S 
Published: June 2019

AbstractThe occurrence of work accidents affecting losses for the industry and workers. Prevention of negative impacts can be controlled through the occupational safety and health management system quality and integrated. This research aims to find the root of the problem in the work cycle occupational safety and health management system using problem tree analysis. This management cycle refers to the OHSAS 18001:2007 standard. This type of research is descriptive qualitative. Based on the results of data analysis, it was found the problems in the occupational safety and health management system at PT. Mega Andalas Kalasan includes the cycle of occupational safety and health policy, planning, implementation and operation, inspection and action to improve occupational safety and health, review of the occupational safety and health management system, and continuous improvement. Problems in each cycle will bring sustainable problems in the next cycle. Findings of problems in the cycle of occupational safety and health policy have an impact on the problems in the initial planning cycle, the weakness of the organization’s managerial planning will bring up problems in the implementation and operation cycles, budget constraints in the implementation and operation cycle raises the problem of the lack of real action cycle improvement of safety and health improvement actions work, the absence of formal socialization of audit results to workers in the review and management system of occupational health and safety has an impact on creating barriers to the cycle of continuous improvement.
The implementation of teaching factory in producing fly ash based eco-friendly concrete products
Authors: Inderawan NA , Widodo S 
Published: June 2019

Abstract
This literature study aimed to describe eco-friendly solutions for developing teaching factory models in vocational high schools by using Fly Ash wastes as cemet replacement materials. The need for eco-friendly concrete has become an innovation which is able to reduce the impacts of environmental pollutions and the concrete product has better quality than conventional concrete. Vocational High Schools in Indonesia have good potential to apply this idea by using teaching factory model for producing eco-friendly concrete because of multiple benefits: (1) reducing the amounts of fly ash wastes; (2) the result of this model is a good quality concrete product that gives benefit to society; (3) providing the understanding of Greening TVET to vocational high students; (4) students deepen their competencies by adapting Greening TVET; (5) also growing good cooperation between steam electricity power plant, vocational school, industry in the field of eco-friendly concrete, and market needs. This study reviewed the various studies about the characteristics and optimum mix design of fly ash as material mixture and teaching factory model. The result of study are idea and design of teaching factory model in Vocational High School by using fly ash as cement replacement of concrete mix design.
The concept of computational thinking toward information and communication technology learning
Authors: Harimurti R , Ekohariadi  , Munoto  , IGP Asto B 
Published: June 2019

Abstract
Computational thinking is a process of problems solving and designing systems using concepts in computer science. Computational thinking is based on a computational principle that involves a wide range of approaches and skills with applications in several disciplines. Computational thinking has been widely applied in the curriculum of various levels of education while still basing on the principles and characteristics of a strong computational thinking. To train the computational thinking to students it must include the computational thinking material in the compulsory material. This material needs to be held since the level of basic education with a simple problem level, the level of the material will increase along with the increase of education level. This article discusses the implementation of computational thinking on information and communication technology learning using a simple programming language that is Scratch. This programming language will make it easier for students to understand the concept of programming by using blocks so that students will easily learn. As a basis for information and communication technology learning, a measurement scale has been developed to measure students’ computational thinking ability. Computational thinking uses a five-point Likert scale consisting of 29 items from 5 developed indicators.
The development of realia for the planetary gear unit to improve students’ understanding on the basics of automatic transmission
Authors: Wakid M , Tafakur  
Published: June 2019

Abstract
This study aims to design and develop a real model of a planetary gear unit providing three kinds of simulation for the basic configurations of the planetary gear unit in which one component member is locked, two members are held together, and two input members works. This is a research and development (R&D) to develop a realia of the planetary gear unit for the learning of automatic transmission basics. The realia is expected to demonstrate how the configurations in which one component member is locked, two members are held together, and two input members moves. This study was carried out through ten stages, namely analyzing potentials and problems, needs analysis, product design, focus group discussion, product development, pilot study (small-scale field test), product revision, large-scale field test, product revision, and final product. The data were collected by questionnaires and were analyzed quantitatively. The product of this study is learning media in the form of realia made of acrylic so that the components are clearly visible and the work of basic configurations of the three gears in the planetary gear unit is easy to understand. These basic arangements can be operationalized on the learning media by applying brakes to the ring, carrier, and sun gears and applying cluthes between the sun and carrier gears, the sun and ring gears, and the carrier and ring gears. Evaluated from its performance, the realia of the planetary gear unit can work well. The shaft can rotate well though some friction generated, the clutch and brake can work on its function, as well as the constituent gears can rotate as its real version does. This is reinforced by the responses from the material and media experts that reveal the product meets the very feasible category.
Improving the compact crucible furnace performance by adding fins in heating chamber
Authors: Leman A , Tiwan  , Widarto  , Ardian A 
Published: June 2019

Abstract
A crucible furnace is developed continuously to obtain appropriate furnace in support casting practice at VHS. This research aimed at improving performance of compact crucible furnace by modification the heating chamber. Fins were placed at inner side of compact crucible furnace wall. The furnace performance determined by increasing of temperature rate to melt 3 kg of aluminium. Descriptive analysis is used to describe performance of modified compact crucible furnace. The fins addition on the inside wall improves the compact crucible furnace performance. The temperature rate is increase as the fins inclination angle increase. Fins with inclination angle of 800 could keep and maintain the temperature of heating chamber. Compact crucible furnace which added fin on the inside wall is able to melt 3 kg of aluminium in 35 minutes.
Automatic water filling and capping machine trainer kit programmable logic controller controller prototype for vocational high school learning validity
Authors: Sukir  , Yuniarti N , Yatmono S , Wicaksono T 
Published: June 2019

Abstract
The purpose of this article is to find out validity level PLC controlled automatic water filling and capping machine as trainer kit for learning in industry automation competence expertise in vocational high school. Research type used in this research is research and development (R&D) according to Robert Maribe Branch. carried out steps are; Analyze, Design, Develop, Implement, and Evaluate. Instrument used is questionnaire and observation sheet. Collected data is analyzed descriptively. Research result shown that validation toward automatic water filling and capping machine prototype as trainer kit for PC practical learning in vocational high school which done by media expert, material expert, and student shown result in very satisfactory category, indicated by: (1) media experts give average score 87.5% (very satisfactory); (2) material experts give average score of 86,9% (very satisfactory); and (3) student give average score of 95,3% (Very Good)
Water level control based fuzzy logic controller: simulation and experimental works
Authors: Khairudin M , Hastutiningsih AD , Maryadi THT , Pramono HS 
Published: June 2019

Abstract
This paper presents an automatic control system for Water Level Control (WLC) using Fuzzy Logic Controller (FLC). The use of FLC on the WLC system so that it can work automatically regulates the rotation speed of the motor (water pump). This system uses the input of Light-Dependent Sensor (LDR) as a light detector sensor outside space and ultrasonic detection sensors as the height of the water. As for the output of the motor rotation be as a replacement water pump for filling water in the reservoir of the water automatically. The working principle of this system is in a light sensor to detect outdoor LDR and Ultrasonic Sensor obstructed water level then the sensor will provide the input signal to the microcontroller in the form of Analog data when it is converted into a digital form signal using an Analog to Digital Converter (ADC). The data is processed using the FLC algorithm. The results show that the lighter in the outdoors and higher low water, the water-pumping Motor speed the faster or maximal. As for when the high water is medium and a bright light or daylight then the speed of motor rotation is medium and at the time of the highest water is maximal then the motor will die. Conversely, if the light on the outdoor is darker or at night and water levels are low or medium, the motor rotation speed will be medium too.
Machining industry’s contribution level in vocational high school revitalization
Authors: Wibowo A E , Munadi S 
Published: June 2019

Abstract
Revitalization of Vocational High Schools (VHS) is an effort to increase the role of all stakeholders in developing education. This study aimed to measure the level of machining industry contribution in VHS revitalization, especially in Machining Skills Competence in Yogyakarta Special Region (DIY). This study used descriptive research with quantitative approaches. The population was 20 machining industry in Yogyakarta Special Region. Samples were determined by saturated sampling techniques. The number of samples selected were 14 machining industries. Questionnaires were used to measure the level of the machining industry contribution in implementation of VHS revitalization. Instrument validation used logical and empirical validity tests. Quantitative data analysis techniques used descriptive analysis. The results of the study showed that the level of machining industry contribution in VHS’s revitalization, especially in Machining Skills Competence in DIY as a whole was in the “very low” category with a score of 42.67%.
A comparative study of the occupational health and safety implementation in the industries and vocational high schools in Yogyakarta
Authors: Styawan B , Sukardi T , Rahdiyanta D , Wijanarka B S , Ngadiyono Y 
Published: June 2019

Abstract
This study aims to describe the extent of the Occupational Health and Safety (OHS) implementation in the manufacturing industries compared with that in the Mechanical Engineering study program of the vocational high schools (VHSs) in Yogyakarta Special Region. It uses the qualitative descriptive statistical analysis with data collection techniques covering field studies with direct observation and interviews. The research participants, the employees of the manufacturing industries and the VHSs’ Mechanical Engineering teachers in Yogyakarta Special Region, were determined purposively. The results show that the application of OHS in the industrial workplaces is somehow better than that in the VHS’s Mechanical Engineering study program in the researched region. In general, the problems of the OHS application in VHSs are perhaps triggered by the lack of health and safety equipment, facilities, and infrastructure in the mechanical engineering workshops and the poor OHS management system (OHSMS). The recommendations made are that VHSs improve the OHSMS, conducting OHS education and training programs for the VHS teachers and staffs, and using rewards and sanctions for all of the school community members.