bluuebunny/crossref_metadata_2025_split huggingface dataset:
Use of Gypsum Waste and Tin Tailings as Stabilization Materials for Clay to Improve Quality of Subgrade
Authors: Apriyanti Y , Fahriani F , Fauzan H 
Published: October 2019

Abstract
Clay is a soil with low stability, so an effort is needed to improve soil stability in order to improve the quality of subgrade. In this study, an effort was made to improve soil stability by adding gypsum waste and tin tailings as a mixture in clay. Gypsum waste and tin tailings have not been utilized optimally in Bangka Belitung Province, so the research needs to be done to determine the effect of using gypsum waste and tin tailings as a material for stability of clay. The tests of soil characteristics carried out in this study were sieve analysis, soil specific gravity, compaction and direct shear test. In this study, the addition of gypsum waste and tin tailings in soft soil with 4 variations, namely clay with additional 8% gypsum waste and 20% tin tailings, clay with additional 8% gypsum waste and 30% tin tailings, and clay with addition 8% gypsum waste and 40% tin tailing, besides that, testing of the original soil was also carried out. The results of sieve analysis test showed that the addition of gypsum waste and tin tailings to clay soils could change the gradation of clay. Addition of gypsum waste and tin tailings on clay soil increases cohesion (c) dan shear angel value so that increases soil shear strength. From the results of the study, the addition of gypsum waste and tin tailings can improve the stability of clay so Improve Quality of Subgrade.
Green-synthesis of CuO-doped SnO2 nanoparticles using pelawan (Tristaniopsis merguensis) leaf extract
Authors: Mustari  , Evi J. , Noor A , Rafsanjani R A , Tiandho Y 
Published: October 2019

Abstract
CuO-doped SnO2 nanoparticles were successfully synthesized using biosynthetic methods with the pelawan leaf extract. This method is a modification of the sol-gel process by utilizing antioxidant compounds from the leaf extract as a trap-matrix for tin oxides. This research was conducted based on variations in CuO doping. The characteristics of tin oxide observed in this study were a phase, crystallite size, and crystallinity, which determined based on x-ray diffraction method. It is expected that the method proposed in this study can be developed to synthesize SnO2 nanoparticles that are environmentally friendly.
The Sustainability of Photovoltaic System at Rawasari Village, Tanjung Jabung Timur through Student Community Service - Community Empowerment Learning Program
Authors: Aliyah F , Novitasari D , Budiarto R , Mahfud A 
Published: October 2019

Abstract
Rawasari is one of location at Tanjung Jabung Timur Regency that installed by photovoltaic system through Millenium Challenge Account Indonesia (MCAI) program by Konsorsium Energi Mandiri Lestari (KEMALA) in early 2018. The total installed photovoltaic system at Rawasari was 41.8 kWp which consisted of solar home system, solar system for public facilities, and solar system for business unit. When Kemala program ended in February 2018, the sustainability of the business unit was threatened because of there was not educated or skilled assistance that ensure photovoltaic system can run well. Therefore, the role of Student Community Service - Community Empowerment Learning Program (SCS-CEL) by Universitas Gadjah Mada (UGM) was deemed necessary to parse that problems. The SCS-CEL program has conducted from June-August 2018 that involved about 27 students from multidiscipline studies. Through two main programs of SCS-CEL namely strengthening the management system for photovoltaic and improving the quality and capacity of production business units. The result showed that an increasing of public awareness of the importance of maintaining a photovoltaic system and developing of drinking water business unit.
Environmental Risk Analysis Of Road Improvement In Tarakan City
Authors: Prihartanto E , Nawir D 
Published: October 2019

Abstract
The development of the Tarakan City Road network for coastal areas has increased. The area of Tarakan in particular, the Binalatung Street has improved quality, it aims to help the community activities to fulfill daily needs. In the activity of this beach road increase has risks that can affect the quality of the work so it is interesting to be researched from the point of view of Public Works and the planning of the city Department as the owner. The research method is done by spreading questionnaires and interviews, with respondents from the Public Works and the planning of the city Department of Tarakan as the owner of the project to increase the road of Tarakan. From the questionnaire will be processed with statistics to find out the highest risk events from the road enhancement activities. The results obtained from this study are from 13 risk variables from 9 risk criteria. analysis of inter-risk relationships followed by micmac analysis so that it is obtained: 1). Autonomous: 1 risk variable. 2). Dependent: 4 risk variables. 3). Linkage: 5 risk variables. 4). Independent: 3 risk variables.
Projection and Analysis of National Energy Consumption Levels on Indonesia’s Economic Growth Rate through Exponential Smoothing Approach
Authors: Dalimunthe D Y , Aldila H 
Published: October 2019

Abstract
This study briefly wants to know the value of the projections of Indonesia’s total energy consumption and how it affects the economic growth that occurs. This is also in line with the need for preventive actions related to the type of policy that will be carried out by decision makers where in this case the government will have an impact on the economic performance of a region reflected in the data presented in income posts and expenditure from Gross Domestic Product. The forecast method used in this study is the Exponential Smoothing method which emphasizes the procedure of continuous improvement of the latest observation objects. This method consists of three types, namely simple exponential smoothing, holt winters and triple exponential smoothing models which will be seen which model is the best. Based on the projection analysis, it was found that the Holt Winters Smoothing Smoothing method was the best method of the other method with R Square value of 0.608, RMSE of 68.446, MAPE of 4.495 and Normalized BIC of 8.888. Based on the projection results for the next n years, total energy consumption has an upward trend with the projection value in 2018 amounting to 1248.76 (thousand barrels of oil equivalent and experiencing an increase in 2019 amounting to 1273.47 (thousand BOE).
Preliminary Plant Design of Biofuel From Algae in Balikpapan, East Kalimantan
Authors: Harahap A F P , Ramadhan M Y A , Lestari T , Gozan M , Srinophakun P 
Published: October 2019

Abstract
Biodiesel is one of the promising alternative energy to replace fossil fuel which is produced from natural resources that contains lipid or oil. Common sources of biodiesel are lately growing controversy about the use of potential food sources for the production of fuel. One of the strongest non-food alternative for biodiesel source is algae since it can produce considerable amount of lipid based on their species and cultivation condition. One of the suitable species that can be used is Botryococcus braunii because of its ability to accumulate high amount of lipid and hydrocarbons extracellularly. All process simulations are done by using SuperPro Designer v9.0. The objective of this algae-based biodiesel preliminary plant design is to provide technological reviews, economical assessments, and HSE assessments of this plant. Based on supply consideration and process area needed, the best location for this plant is in Kariangau, Balikpapan, East Kalimantan with the estimated land area of 7,700 m2. The value of IRR and ROI of this plant is found to be 17.39% and 16.9% respectively. The NPV of this plant is 2,902,358.32 USD. It can be concluded from the profitability analysis that this algae-based biodiesel plant with capacity of 3,000 ton of biodiesel per year is economically feasible with payback period of 5.91 years.
Simulation of ejector for vacuum generation
Authors: Macia L , Castilla R , Gámez P J 
Published: October 2019

Abstract
Supersonic ejectors are used in a wide range of applications such as compression of refrigerants in cooling systems, pumping of volatile fluids, or vacuum generation. The objective of the present paper is to mesh and simulate, in an OpenFOAM environment with an open access implicit density-based solver HiSA, the physics of the vacuum ejector, and, later, compare the results with experimental measurements. In order to achieve this a 2D axisymmetric mesh made by hexahedral cells has been created. Steady solutions have been obtained, with prescribed total pressure in primary and secondary inlets. Secondary total pressure ranges from 1 to around 0.2 bar in which the secondary flow is zero. Numerical results are compared with experimental measurement, with two flowmeter sizes for small flow rate accuracy. Two regimes are encountered. In supercritic regime the secondary is chocked and sonic flow is reached in the second nozzle. In subcritic regime, the secondary flow is subsonic. The agreement is good, although simulation tends to slightly overestimate flow rate for large values region.
Effect of friction on nominal stress results in a single tooth bending fatigue test
Authors: Vukic M , Čular I , Mašović R , Vučković K 
Published: October 2019

Abstract
One of the main reasons for gear failure is bending fatigue, which occurs due to cyclic stresses at the tooth root region. Bending fatigue can cause crack initiation which, in turn, may propagate and result in catastrophic tooth breakage. Single tooth bending fatigue tests are frequently employed to generate statistically significant fatigue data at relatively low price. Hence, they are often employed as screening tests for bending fatigue behaviour of actual running gear pair. Since relatively small alteration of nominal tooth root stress values can produce significant change in bending fatigue lives, it is important to adequately consider the effect of friction and test fixture deformation when conducting single tooth bending fatigue tests. In this paper, numerical investigation of tooth flank friction effect on spur gear load capacity during single tooth bending fatigue test is carried out. Two different test fixtures are considered. Linear elastic finite element analysis is carried out to obtain nominal tooth root stresses. The results show that friction at gear tooth flank as well as fixture deformation can affect nominal tooth root stress results.
Gears or rotors - three approaches to design of working units of hydraulic machines
Authors: Stryczek J , Bednarczyk S , Codina E , Gamez-Montero P J , Ivanovic L , Matejic M 
Published: October 2019

Abstract
The gerotor pump has many advantages over other hydraulic pumps, such as high reliability, compactness, lower noise in running conditions etc. Considering the increasingly stringent regulations in the field of environmental protection, one of the main goals in the industrial applications of gerotors is to improve their design by using light materials and optimize their performance. This paper will give an overview of modern research that focuses on improving the performance of gerotor pumps. A joint publication of three university centers, namely of Wroclaw, Terrassa and Kragujevac, presents their original approaches to the problem of designing gerotor and orbital systems. The presentations have been prepared in separate parts, but according to similar rules. The first part of the paper focuses on meshing between internal and external gear of gerotor. Analysis for both cases, moved axis and fixed axis, will be provided in accordance to their working characteristics and their application. The second part of the paper provides the design of a gerotor pump strikes a balance between volumetric efficiency, manufacturability and mechanical efficiency. The third part of the paper defines the methodology for selecting the best combination of geometric form parameters of the trochoidal gearing in relation to the reduction of contact stresses and improving other characteristics of the pump. All three parts provide manufacturing and application review in the fluid power machines. Paper concludes with presented theoretical and experimental review of the authors and their practice achievements.
Stress analysis of lifting table using finite element method
Authors: Rasovic N , Vučina A , Obad M 
Published: October 2019

Abstract
Lifting table has been designed and developed through the concept of Learning Factory (LF) at the University of Mostar. The idea for lifting table design has come from the local industry needs for a lifting platform that should lift a man and/or load at a certain height. For safety reasons, design is checked under the loading using a method of finite element analysis. The paper predicts and explains methodology for structural analysis used in presented case study. Results of FEM analysis are basis for making ways and guidelines to optimize current design in order to get optimal parameters for weight, stability, capacity, mobility and layout of the lifting table.
The response of a random vibrations of nonlinear structure under white-noise excitations
Authors: Stan P , Stan M 
Published: October 2019

Abstract
Random vibration is the phenomenon wherein random excitation applied to a mechanical induces random response. Random vibration is the most practical of the areas discussed in this paper. In this paper, the sistem is excited by a force W which is a random process described. A method is to replace the governing set of non-linear defferential equations by an equivalent set of linear equations the defference betwen the sets being minimized in somme appropiate sense. In this way, the parameters of the linearised system are determined.
Analysis of the wind effect on the mechanical structures in the case of the four-side sunshade
Authors: Markovic B , Krajišnik M , Đurić A 
Published: October 2019

Abstract
This paper presents the analysis of the wind effect of four-side sunshade construction. The aim of the paper is to demonstrate the possibility of applying analogy in research, with examples from civil constructions, in order to simplify and reduce the analysis. The paper presents the analytical calculation of the pressure on the sides of the four-sided sunshade, analogously to the calculation of pressure on the four-sided roofs of civil construction objects.
Failure diagnosis and prognosis of sliding bearings
Authors: Antunovic R , Vučetić N , Halep A 
Published: October 2019

Abstract
Sliding bearings are widely used machine elements from which the correct operation depends on the availability of many technical systems and great attention is paid to the study of the prediction method for sliding bearings. Problems that occur with sliding bearings lead to high levels of vibration and noise. One of the important parameters in the diagnosis and prediction of the failure of sliding bearings is the thermal analysis. In addition to these parameters, frequent vibration spectrum analysis, oil film thickness and other relevant parameters are often used. Using advanced technologies, it is possible to significantly reduce the duration of measurement, and on the other hand increase the accuracy of diagnostic methods. Phase logic is a mathematically formalized mode of representation modeling uncertainty. In this paper, a selection of damage in the operation of a sliding bearing has been made and the way of diagnosing these problems is shown. Methods that integrate several diagnostic parameters into one show reliable methods of early detection of slip bearing damage.
Application of the multi-criteria decision making in the selection of materials of composite shaft
Authors: Djordjevic Z , Jovanovic S , Kostic S , Blagojevic M , Nikolic D 
Published: October 2019

Abstract
Thanks to the outstanding combination of construction and special features such as high resistance and stiffness, increased wear resistance to fatigue, higher values of critical speeds, lower mass, long lifetime, and so on, today a growing number of shafts, especially in the automotive industry, are made of composite materials. The optimal values of these parameters can be obtained by selecting the appropriate material.
The selection of materials in the process of product design requires efficient decision-making. Incorporating hybrid materials, in addition to providing the potential for improved performance, can make the decision-making process in the selection of material difficult. In this sense, the use of multi-criteria decision making (MCDM) was used as an adequate tool and support for making optimum decisions. This method has the potential to improve practically all areas of decision making in engineering from design to product.
Tools of organizational-economic mechanism of internal control functioning
Authors: Aristarchova M K , Fakhrutdinov V S 
Published: October 2019

Abstract
The article touches upon the topical issues of the internal control functioning at the enterprise. The tools developed by the organizational-economic mechanism of functioning of internal control, including the principles, functions, logicaly, time aspect, controlling, norms. The structural and functional components of internal control are identified, the technology of each of them is considered. The adaptive organizational structure of the risk management and internal control system is formed, which can be the basis for the formation of the model of internal control of the gas transportation enterprise.
Modeling of 3D temperature field in butt welded joint of 6060 alloy sheets using the ANSYS program
Authors: Matuszewski M 
Published: October 2019

Abstract
In work, the modeling of a three-dimensional temperature field in a butt weld connection of two 6060 aluminum alloy sheets using Finite Element Method is presented. The calculations were performed for two welding methods: TIG (Tungsten Inert Gas) and MIG (Metal Inert Gas). The Goldak's double ellipsoidal heat source model has been used in modeling. The thermal-mechanical properties of the material were assumed to depend on the temperature. The Workbench, DesignModeler, Mechanical, Fluent and CFD-Post modules of the ANSYS program were used for numerical simulations. In the description of the geometry of joints, cube type elements were used, with density of grid in the heat affected zone. The parabolic shapes of face and root were assumed based on the literature and results of the experiment. The temperature distributions in cross-sections of welded joints as well as welding thermal cycles at selected points were analyzed. The results of numerical simulations were verified experimentally. Comparison of calculated and obtained in the experiment the characteristic limits of heat affected zones showed satisfactory compatibility. The directions of heat propagation determined by vectors of cooling rates coincide with the longitudinal axis of dendritic grains determined on the basis of metallographic tests.
Energy performance of the Serbian and Estonian family house with a selective absorption facade
Authors: Lukic N , Nešović A , Nikolić N , Siirde A , Volkova A , Latosov E 
Published: October 2019

Abstract
In this paper the influence of selective absorption facade on heating energy consumption of the family house is analyzed. Two houses built according to Serbian and Estonian building energy performance regulation (minimum requirements) are simulated by EnergyPlus software. For simulation process the appropriate weather data are used (Serbia – Kragujevac and Estonia – Tallinn). Heat transfer by radiation, gains and losses can be a significant part of the energy consumption, during heating season. Using selective absorption facade those gains and losses could be increased and reduced, respectively. Several simulation scenarios of Serbian and Estonian house are carried out. Different weather conditions in case of the defined houses point on specific impact of the applied improvement on family house energy performance. Maximum annual percentage savings of heating energy compared to house without selective facade, in case of Serbian house are obtained as 8.32%. In case of Estonian house maximum savings are obtained as 1.92%.
Innovative solution of fine horizontal trash rack for small hydroelectric power stations
Authors: Miltenovic A , Prodanović M , Beju L , Miltenović V , Velimirović N 
Published: October 2019

Abstract
Alternative energy sources have a number of advantages over energy derived from fossil and nuclear power plants. In this way, the environment is protected, and many countries are encouraging the use of alternative energy sources. Large potential from this aspect has small hydropower plants, which are not expensive, they can be installed on small rivers, and in this way the received electricity is much cheaper. One of the problems that need to be solved is to prevent the penetration of impurities into turbine plants. This is solved by placing protective trash rack on water intakes. The paper presents an innovative solution for horizontal fine trash-rack with cleaning function for small hydro-electric power stations.
Insulation impact on appliance acoustic characteristics
Authors: Zvolensky P , Lestinsky L , Dungel J , Grencik J 
Published: October 2019

Abstract
The paper is aimed on types of insulation actually used in washing machines and raising requirements on its characteristics. Next part is design of unconventional insulations, which will be applied directly on appliance. Then, series of tests will pass (according to regulations), so it will be possible to determine acoustic power. After that, we will use simulation to determine impact of insulation rigidity on washing machine shell (with identification of acoustic benefit). Relatively important factor is rigidity of washing machine shell and forces affecting the shell. Force affecting on the shell depends on inner and outer tub weight (and all equipment attached), load, unbalance in a drum and revolutions during spin cycle. Usually more rigid washing machine shell produces less noise than weaker shell. That’s why is relatively important to stiffen shell. Doing this by changing type of insulation is advantageous because it is possible to do without any significant side effects.
Indoor positioning and navigation system for autonomous vehicles based on RFID technology
Authors: Regus M , Talar R , Labudzki R 
Published: October 2019

Abstract
The localization and navigation systems play a very significant role in today’s world. They are commonly used in different fields of industry as well as in our daily life. Location of objects is crucial in logistics and transport to provide the real-time monitoring and management of process chain. There are numerous methods which allows to follow people and objects within defined area. One of them is Global Positioning System (GPS), which provides geolocation of objects on the earth as long as an unobstructed line of sight to four or more satellites is assured. As a consequence of this limitation, GPS cannot be applied for indoor environments. Recently, a couple of Indoor Positioning Systems (IPS) based on different technologies have been developed. Despite the drawbacks and limitations, these systems have been successfully applied for different fields of industry. Notwithstanding the above, reliable, accurate, cost-effective and simple indoor positioning methods are still in the area of scientists interest. Present paper provides a general overview of existing indoor positioning systems as well as authors concept of 2D wireless indoor positioning and navigation system dedicated for autonomous vehicles based on Radio Frequency Identification (RFID) technology.