bluuebunny/crossref_metadata_2025_split huggingface dataset:
POLYSOL – Thermal and electrical performance assessment of a cost-effective polygeneration system
Authors: Soares J , Shahzamanian B , Varga S , Palmero-Marrero A , Oliveira A C 
Published: October 2019

Abstract
Buildings are responsible for a large portion of the energy consumption and harmful emissions to the environment. To change this situation, the European Performance of Buildings Directive requires new buildings to be nearly Zero Energy Buildings. To achieve this goal, energy saving measures combined with large use of renewables on-site must be applied. In this paper, a reliable and cost-effective polygeneration system for an existing test building, able to provide electricity, cooling and heating needs is presented, modelled and assessed. The system relies on solar energy as the primary source (PV and solar thermal collectors). Building heat and cooling demand is achieved with a variable geometry ejector heat pump. To reduce the mismatches between generation and consumption, it includes different types of storage (electrical and thermal). For the test building energy needs assessment, the electricity consumption of all test building consumers was measured. Thermal energy demand evaluation required the development of a dynamic numerical model using TRNSYS software. The building thermal performance was validated using experimental data. The numerical model also includes the solar field, thermal energy storage, ejector cycle subjected to know meteorological conditions and operation control. To model and simulate yearly electricity production PVSyst commercial software was applied. Regarding the thermal energy, it was found that on a yearly basis the energy supplied by the thermal collectors about six times the demand. Nevertheless, on the hourly and daily levels, there are thermal energy shortages, due to the lack of solar radiation or mismatch between production and demand. Regarding the electric energy consumption, the potential electric energy production is about 1.6 times the demand. Like for the thermal energy, on the hourly and daily levels, there are energy deficits mostly in winter, for which an electrical energy storage unit will be used. Additionally, the highest peak occurs in summer because of low solar radiation at the end of the day and high demand due to the high cooling load of the test room.
Simulation and control of shading systems for glazed facades
Authors: Chaudhary G , Goia F , Grynning S 
Published: October 2019

Abstract
This paper presents a simulation study on the use of shading devices in highly glazed facades in the context of zero emission buildings (ZEB) located in a Nordic climatic context. Shading devices have the task to control different uses of solar energy (solar gain for passive solar heating and daylighting) and to avoid cooling load, and to find the best strategy (i.e. to optimize the overall performance) for controlling shading devices is not trivial.
Different control strategies for the activation of the shading devices (venetian blinds) are simulated, and their performance calculated in this study through a dynamic whole-building simulation tool (EnergyPlus). The results of the simulation studies show that it is possible to achieve very high performance and balanced use of solar energy (for passive solar heating, daylighting), without occurring in too high cooling load, even in the case of fully glazed facades. The optimal strategy for shading activation is not straightforward, and different strategies should be recommended during the year to assure an overall optimal performance.
Characterization of methyl ester compound of Carica papaya seed oil through Transesterification using CaO Catalyst from Strombus canarium shells
Authors: Sarianto M , Rado  , Kusuma G F , Asriza R O , Fabiani V A , Kafillah M 
Published: October 2019

Abstract
Biodiesel is an alternative fuel that is included in renewable energy. Various problems of the source of raw materials for making biodiesel create an opportunity to find alternative sources of raw materials from plant oils, one of which is papaya seeds. Extraction of papaya seeds into oil is carried out by socletation and distillation methods. GCMS analysis showed that papaya seed oil contained oleic acid. Biodiesel transesterification has been carried out using CaO catalyst from the Strombus canarium shells. The reaction was carried out at the papaya seed oil to methanol molar ratio of 1: 6, presence catalyst 5% wt relative to oil and temperature reaction of 65 °C for 2 h. GC/MS analysis result showed that the content of methyl esters is 50.35% with the highest abundance is 10-Octadecenoic acid and the smallest abundance is 9-Octadecenoic acid.
Biodiesel Production From Waste Cooking Oil Using Catalyst CaO Derived From Strombus canarium shells
Authors: Fabiani V A , Asriza R O , Fabian A R , Kafillah M 
Published: October 2019

Abstract
In this article, we address the optimal biodiesel production through transesterification reaction using waste cooking oil, methanol and presence of calcium oxide (CaO) as a solid base catalyst. CaO catalyst was activated from calcined Strombus canarium shells, collected at Bangka Belitung Islands Province, Indonesia. X-Ray Diffraction and X-Ray Fluorescence (XRF) were applied to characterize the prepared catalyst. The transesterification process will produce methyl ester (biodiesel) yield of 83.5% was obtained in the optimum condition at the waste cooking oil to methanol molar ratio of 1:12, presence catalyst 3.0% wt relative to oil and temperature reaction of 65 oC for 4 h. The GC-MS analysis assured to identify the chemical composition of the synthesized biodiesel which contained methyl myristate and methyl palmitoleate as the dominant esters. As such, the uses of Strombus canarium shells as a catalyst source and waste cooking oil as a feedstock for biodiesel production.
Combustion of Purified Biogas after Carbon Dioxide Absorption Using Sodium Hydroxide
Authors: Pertiwiningrum A , La’aliya I , Windiaka B U , Yusiati L M , Harto AW 
Published: October 2019

Abstract
Biogas is an alternative clean energy that can replace the utilization of LPG, fossil fuel for cooking. But many reports said that biogas is mixture composition which carbon dioxide composition must be removed. This study aims to investigate the combustion performance of purified biogas after sodium hydroxide absorption. Carbon dioxide removal has been conducted by absorption method. There are 4 type concentration of sodium hydroxide (NaOH) that used in this study 5, 15, 25 and 35. After carbon dioxide absorption using 5, 15, 25, 35% methane content of biogas increased. The increase in methane affected on the increase in calorific value. Purified biogas after absorption using 5, 15, 25 and 35% of sodium hydroxide increased 187.91, 225.42, 227.91, and 243.82 kJ respectively.
From Kongsi to Sakan: Tracking the Transformation of Chinese Influence in the Worker Organization and Tin Production on Bangka Island
Authors: Ibrahim I , Pratama S , Rendy R , Sujadmi S , Saputra P P 
Published: October 2019

AbstractThe history of Chinese ethnic migration to Bangka Island is inseparable from the history of economic expansion based on production from tin mining. Initially, the Chinese were brought ascoolieto work in tin mines and then had a major influence on tin management in this area to date. This paper traces the transformation of Chinese influence in tin mining so that this paper will be focused on the organization and production process. This paper is obtained from the results of qualitative research that has an explorative pattern. This study found that the transformation of Chinese influence in tin mining occurred in at least two forms, namely transformation in worker organization, and transformation in the production process. In worker organizations, it was found that Chinese involvement in workers was organized bytikoin akongsiform, in the form of a partnership. When the reforms began and open mining began to flourish, the ethnic Chinese were transformed into tin owners and traders, no longer ascoolie. Transformation also occurs in the form of the use ofSa Kantechnology in the production process that is used even more varied in the post-reform period of 1998. This study observed that the technology used since the early has contributed to the damage to the environment, although the rate of damage it is manual compared to newer and more masive technologies since the last of two decades.
Acute Oral Toxicity Test of Nicotiana tabacum L. Bio-Oil Against Female Winstar Rats
Authors: Andjani H N , Sentosa Y , Yati K , Fauzantoro A , Gozan M , Yoo Y J 
Published: October 2019

Abstract
Tobacco plants are notably known for its pesticidal properties, particularly due to its nicotine content. In this study, Nicotiana tabacum L. bio-oil was obtained using pyrolysis technique. The safety of the bio-oil to be used as bioinsecticide was analyzed through acute oral toxicity test by administering 5000 mg bio-oil/kg body weight of female winstar rats that were analogous to humans. It was concluded that the bio-oil was not toxic due to absence of mortality and no significant change in the body weight and behavior of the rats.
Mapping of Temporary Disturbance and Testing Partial Discharge To Minimize Disturbance and Improving System Reliabilitity In Lampur Feeder
Authors: Siregar E M , Budianto T H , Kurniawan R , Puriza M Y 
Published: October 2019

Abstract
Of the total disturbances that occur in Lampur feeder, most of disturbance are caused by temporary disturbance whose source of disturbance is unknown/not found. Only relying on sense of sight to find the source of disturbance results in a disturbance occurring repeatedly without a solution to resolve the disturbance and inefficient in the process of finding the location of the disturbance. With middle voltage air feeder inspection management, the location of the source of the disturbance can be found. Disturbance point search process with inspection management consists of mapping medium voltage air feeder using distribution software and detailed search in the field with ultrasonic tools. The results of this inspection management can reduce temporarily disturbance and also reduce energy not sale (ENS) on Lampur feeder.
Essential oil processing of pepper process with aluminium condenser
Authors: Setiawan Y , Prayitnoadi R P , Saputra E 
Published: October 2019

Abstract
There are many ways to produce essential oils from pepper, one of which is the distillation system. This paper aims to determine the results of essential oils of pepper through a process of distillation of water and steam produced from 500 grams of pepper seeds using a time variation of 4 hours, 6 hours and 8 hours using water and steam distillation, but heating using an electric stove and condenser coil made of aluminium. The results of the most volatile oil volume at 6 hours were obtained 11.8 ml with a specific gravity of 0.87, the refractive index of 1.48 and solubility in 95% ethanol with an essential oil content of 2.36%. This innovation provides an interdisciplinary approach to study the environmental systems and find solutions to resolve the problems associated with it for sustainability
Reliability of cylindrical tank exposed to fire
Authors: Delosevic M , Sremac S , Tepić G 
Published: October 2019

Abstract
The paper presents a methodology for assessment the reliability of tank due to typical accidents. The aim of the research is to identify fracture lines and shapes of fragments generated by tank explosions. Accident scenarios and their probabilities are defined with Event Tree Analysis (ETA). Static structural analysis of the tank is realized by the software package ANSYS 15. The probabilistic mass method (PMM) was used to assessment the shape of the fragments. The assessment of the reliability of the tank affected by the fire was carried out according to Fault Tree Analysis (FTA). Verification of the results obtained was made according to available accidents. It has been found that the construction of the tank and especially the type of end caps affects the fragmentation pattern, i.e. the shape of fragments created by explosion. The results of the research are practically usable during the design of the tank because they provide information that is not contained in EN 13445-3.
Macro-roughness height determination of teeth surfaces obtained by gear generating method
Authors: Babichev D T , Babichev D A , Yu Lebedev S 
Published: October 2019

Abstract
The article describes three types of gear teeth surfaces: smooth (envelope), striped (with combs) and scaled (with pyramids and combs connecting the pyramids). The method for combs and pyramids height (above an envelope) determination based on “velocity and acceleration of penetration” conceptions is introduced. Acceleration of penetration allows determining an actual workpiece surface deviation from a theoretical envelope without generating surface knowing. The computer simulations have been carried out, and the correlations between combs and pyramids height and gear machining parameters are exposed.
Delamination assessment of composite curved angles using simplified FEA models build-up by 2-D layered shell elements
Authors: Baba M N 
Published: October 2019

Abstract
As widely known, an accurate analysis of the stress state across the thickness of a composite laminate requires the calculation of the interlaminar through-the-thickness stresses as well as the shear stress components at the layers’ interfaces. These so-called out-of-plane stresses are the key parameters when defining the delamination strength of curved composite laminates, particularly when their radius of curvature and the thickness of the composite are of the same size order. Since the use of layered solid elements is far from a reasonable approach in practical design applications, based on the finite element analysis results obtained through the use of conventional layered shell elements, the purpose of this paper is to propose a simplified post processing approach that enable to predict the interlaminar stress components originated across the thickness of symmetrically balanced curved composite laminates under the combined action of axial forces, shear forces and bending moments applied in curvature plane. A benchmark analysis to provide a critical comparison between a reference finite element model constructed based on 3-D layered solid elements and a simplified model build-up by 2-D layered shell elements is also considered.
The application of the ballistic pendulum for the bullets velocity measurements
Authors: Milutinovic J M , Hristov N P , Jerković D D , Marković S Z , Živković A B 
Published: October 2019

Abstract
The accurate values of the initial velocity of bullets are significant for the quality and precision of small arms. The application of the simple measurement methods, during the tests of the weapon and ammunition, enables the determination of the velocity values from the group of shoots. The accuracy of bullet trajectory, appropriate trajectory correction parameters and terminal ballistics parameters are depended of the quality of initial conditions as initial velocity. The ballistic pendulum, as simple and old-design device, enhanced with optoelectronic encoder sensor and computer acquisition system, can be one of the good start-up device platform for measurement of velocity and observation of the terminal ballistics effects. The function principle of the considered device is based on the energy conservation. Initial data are mass of bullet, mass and dimension of pendulum, and result is velocity, according to the values of time and angle of pendulum. The output signals of measured angle in time are captured, and as required values for calculation the velocity on the microprocessor platform, for each shoot in the test group. The microprocessor platform saves measured and calculated values in memory and generates statistic report of results. The presented method can improve weapon and ammunition tests, by decreasing the time of measurement acquisition and increasing the quality and speed of results without errors. The method and system is simple and low-cost, and enables the design of small arms ammunition database of testing results.
Trends of using polymer composite materials in additive manufacturing
Authors: Regassa Y , Lemu H G , Sirabizuh B 
Published: October 2019

Abstract
Additive manufacturing (AM) technology is nowadays one of the advanced manufacturing technologies used to convert three dimensional product data to physical objects without any special tooling. The emergence of the technology has made production of complex geometries having consumer demands for more customized products and services. Though the underlying technology was initially intended for rapid prototyping, the technology has recently getting wider attention in diverse industrial sectors using different material types commonly polymers, metals, ceramics, and other compatible researched materials as input. Because the technology processes the input materials with no or very low wastes, the use of polymer composite materials leads to a no waste manufacturing system. This article aims to review and analyse the opportunity and existing challenges for AM technology in processing polymer composites and provide an insight on the state-of -the art applications. The paper provides an overview of the materials and processes currently available for this novel production technology to fill the industrial needs for engineering application. In addition, closely reviewing published research works in the area, the existing research gaps are identified for possible future research in the field.
Transaction applications of enterprise information system
Authors: Prajová V , Homokyová M , Horvátová M 
Published: October 2019

Abstract
The huge amount of data currently available to enterprises needs to be exploited to their advantage, as the lack of information can decide the future of the enterprise in the near future. On enterprises development in recent years has been greatly influenced by the rapid development of technologies for processing and organizing them. These technologies share the role of an information integrator to support decision-making at all levels of the manufacturing enterprise. Enterprise resource planning is a key transactional application of enterprise information systems. Its main features include the ability to automate and integrate key business processes, functions and data across the enterprise.
Indicators of tax reliability of innovative activity
Authors: Aristarkhova M K , Zueva O K , Zueva M S 
Published: October 2019

Abstract
Corporate tax management – the organizing subsystem of the enterprise promoting creation of conditions for formation and the direction of stable financial flows in the state budget.
Management of this subsystem is based by means of formation of the indicators reflecting technologies of performance of the functions assigned to it, values of indicators of corporate tax management characterize internal work of the enterprise for lawful optimization of tax payments. At the same time quite often there is a need of assessment of tax opportunities of the enterprise which would predetermine its ability to implementation of tax payments during the concrete period of time.
Fatigue behaviour of friction stir welded AA-2024 aluminium alloy sheets
Authors: Vuherer T , Kramberger J , Milčić D , Milčić M , Glodež S 
Published: October 2019

Abstract
The presented paper deals with the mechanical and fatigue properties of the alloyed aluminium alloy AA-2024 welded by the Friction Stir Welded (FSW) process. Using the optimized tool and welding procedure, 6 mm thick plates made of about quoted material were connected. In the first part of the paper, the influence of welding speed on the microstructure and mechanical properties of treated FSW welded joints is studied. In the continuation, the fatigue behaviour of treated welded joints is analysed based on the experimental testing on a servo-hydraulic fatigue testing machine at room-temperature under the stress ratio R=0.1 The experimental results have shown that the welding parameters have a significant influence on the mechanical and fatigue properties of AA-2024 welded sheets.
Parameter optimisation and failure load prediction of resistance spot welding of aluminium alloy 57547
Authors: Duric A , Klobčar D , Milčić D , Marković B 
Published: October 2019

Abstract
This paper will also present single objective optimization and Failure load prediction of Resistance spot welding of Aluminium alloy 57547. The experimental studies were conducted under varying welding currents I, electrode forces F, welding times T, pred preheating currents IA. The settings of welding parameters were determined by using the Taguchi experimental design of L9 Orthogonal array method. For optimization and prediction will be used analysis of Signal-to-Noise (S/N) ratio and Response surface modelling RSM.
Non-woven composites intensification properties for air filters by plasma pre-treatment
Authors: Neznakomova M P , Klotz M-L , Gospodinova D N 
Published: October 2019

Abstract
The nonwovens use in the automotive industry has increased significantly. Nonwovens for air filters can be changed in a desired direction to have specific properties. The use of non-woven textiles in the automotive industry has the following advantages: it reduces the weight of the vehicle, increases comfort and provides improved insulation, fire retardancy and resistance to water, fuels, extreme temperatures and abrasion. The electrospinning process is one of the nanofibres, two-layer and multilayer composites with their participation obtaining methods. The low frequency plasma surface modification of needle-punched polyethilenthereftalat (PET) nonwoven fibres is good possibility to intensification the process and the rate of increase of the mass of nanolayer regarding to its’ hydrophobicity. The plasma physicochemical treatment type allows adhesion change and change of electro physical properties at the expense of new active centres formation that do not exist in the native fibre. In this study, different gases (Ar, O2 and air) and electrical conditions were employed. The surface changes of PET fibres were investigated by cation exchange capacity (CEC) determination and its influence on the mass nanofibres increase rate. Observation revealed the plasma treatment significantly change surface wettability of PET fibres. The effect of caused change on the electrospinning process is analysed.
Assessment of dynamic properties of a carriage using multibody simulation considering rigid and flexible tracks
Authors: Dižo J , Blatnický M 
Published: October 2019

AbstractRecently, we cannot imagine investigation and analysing mechanical properties of railway vehicles without using state-of-art tools. They are implemented in whole process of design, analysing, verification, testing and optimising of railway vehicles. Such an approach saves time for development, production costs and finds application across whole spectrum of produced types of railway vehicles. In order that the approach based on simulation computations can reliably simulate the reality, a virtual model of a railway vehicle has to take into account as many factors as important. When we investigate behaviour of a railway vehicle in terms of dynamics, we used the multibody approach for creating its computational model. The goal of this article is evaluation of output quantities of a passenger car from the dynamics point of view. The main objective is assessment of selected values for rigid and flexible models of a track. There are evaluated quantities, which belong to main assessed outputs for investigation of dynamic properties of a passenger car. There are values of vertical forces in the wheel/rail contact as the indicator of dynamic load of a railway track as well as the bodies of a railway vehicle.