bluuebunny/crossref_metadata_2025 huggingface dataset:
Multi‐scale features fusion from sparse LiDAR data and single image for depth completion
Authors: Wang Benzhang , Feng Yiliu , Liu Hengzhu
Published: October 2018

Recently deep learning‐based methods for dense depth completion from sparse depth data have shown superior performance than traditional techniques. However, sparse depth data lose the details of the scenes, for instance, the spatial and texture information. To overcome this problem, additional single image is introduced and a multi‐scale features fusion scheme to learn more correlations of the two different data is proposed. Furthermore, sparse convolution operation to improve feature robustness for sparse depth data is exploited. Experiments demonstrate that the approach obviously improves the performance for depth completion and outperforms all the previous published methods. The authors believe their works also have the guidance significance for stereo images depth estimation fused with sparse LiDAR depth data.
Recursive surface structure for fixed‐time convergence with applications to power systems
Authors: Mishra Jyoti , Patel Ragini , Yu Xinghuo , Jalili Mahdi
Published: October 2018

In this study, a novel idea is proposed for fixed‐time recursive surface structure design for arbitrary‐order system. The stability of controller design methodology is verified by using Lyapunov analysis. The primary benefit behind formulating the proposed surface structure is in achieving fixed‐time convergence during sliding. Moreover, the control structure is designed to get fixed‐time convergence during reaching as well. The approximate convergence time has been calculated mathematically and is verified using simulations. The sliding mode control is formulated for single‐input‐single–output non‐linear dynamical systems. The proposed control scheme is robust and the singularity is avoided. The conditions to ensure stability during reaching phase are derived and are shown to depend only on the design of surface parameters. The detailed simulation results of a general third‐order dynamic system show the efficacy of the proposed scheme. Finally, the proposed method is implemented for automatic generation control (AGC) of a multi‐area interconnected power system while considering the non‐linearity in the dynamic system. For the first time, fixed‐time convergence is assured for AGC. To the best of the authors' knowledge, no such structure is proposed yet for AGC. The results are also compared with the traditional proportional–integral controller.
Selecting optimal bands for sub‐pixel target detection in hyperspectral images based on implanting synthetic targets
Authors: Sharifi Hashjin Shahram , Darvishi Boloorani Ali , Khazai Safa , Abdollahi Kakroodi Ata
Published: October 2018

Target detection at sub‐pixel abundances is, in fact, one of the challenging issues of hyperspectral image processing. Selection of optimal bands to improve sub‐pixel target detection (STD) performance is one of the common solutions, applied by many researchers. Nevertheless, the absence of sufficient training data is the main weakness of selecting optimal bands with regard to this approach. The present research introduces a new band selection method for STD in hyperspectral images, based on creating training data, in which the desired target spectrum is implanted randomly in a series of host pixels from the entire hyperspectral image. Afterwards, via running an optimisation algorithm twice, with the aim of minimising the false alarm rate (FAR) in local adaptive coherence estimator target detection algorithm, the number of optimal bands and optimal spectral bands are selected. In this study, the performance of three optimisation methods including the genetic algorithm (GA), Grey Wolf optimisation (GWO), and particle swarm optimisation (PSO) are compared. Experimental results on HyMap and Hyperion datasets show that the proposed method obtains the minimum FAR compared with the rest of the evaluated methods. Also, based on the results obtained, GWO outperforms GA and PSO optimisation methods in the STD domain.
Mid‐infrared suspended waveguide platform and building blocks
Authors: Sánchez-Postigo Alejandro , Wangüemert-Pérez Juan Gonzalo , Soler Penadés Jordi , Ortega-Moñux Alejandro , Nedeljkovic Milos , Halir Robert , El Mokhtari Mimun Faysal , Xu Cheng Yolanda , Qu Zhibo , Khokhar Ali Z. , Osman Ahmed , Cao Wei , Littlejohns Callum G. , Cheben Pavel , Mashanovich Goran Z. , Molina-Fernández Íñigo
Published: October 2018

In this work, the authors present their recent progress in the development of a platform for the mid‐infrared wavelength range, based on suspended silicon waveguides with subwavelength metamaterial cladding. The platform has some intrinsic advantages, which make it a very promising candidate for sensing applications in the molecular fingerprint region. Specifically, it can cover the full transparency window of silicon (up to a wavelength of 8 μm), only requires one lithographic etch‐step and can be designed for strong light–matter interaction. Design rules, practical aspects of the fabrication process and experimental results of a complete set of elemental building blocks operating at two very different wavelengths, 3.8 and 7.7 μm, are discussed. Propagation losses as low as 0.82 dB/cm at λ0 = 3.8 μm and 3.1 dB/cm at λ0 = 7.7 μm are attained for the interconnecting waveguides.
User centric economic demand response management in a secondary distribution system in India
Authors: Eapen Rohit Rajan , Simon Sishaj Pulikottil , Sundareswaran Kinattingal , Nayak Panugothu Srinivasarao
Published: October 2018

This study presents a demand response (DR) model to curtail the load during peak hours in a secondary (230/440 V) distribution system of Tamil Nadu Generation and Distribution Corporation (TANGEDCO), a state‐owned enterprise, India. TANGEDCO penalises utilities if they violate their permitted contractual limit of demand. Conventional demand control usually curtails a specific region of the secondary distribution network. The limitation of the complete blackout of the particular region in the distribution network increases the loss of load probability. Hence, this project implements an economic DR model in real time using demand side forecasting and by scheduling air‐conditioning loads based on their priority. The pilot project is executed and is monitored at the National Institute of Technology, Tiruchirappalli, India campus. A standard back propagation neural network is used for forecasting a 15 min interval ahead maximum demand in kVA. This economic model comprises of a communication network that uses ON/OFF switching wirelessly controlled relay modules. Finally, the benefits and the strategy involved in the project are presented. It is found that the proposed scheme prevents the electrical demand from exceeding the contractual limit, whereby the penalty due to the violation is zeroed when compared to the previous year.
Voltage stability improvement of wind power grid‐connected system using TCSC‐STATCOM control
Authors: Kuang Honghai , Zheng Liping , Li Shengqing , Ding Xiaowei
Published: October 2018

Aiming at the voltage stability problem of wind power grid‐connected systems, a cooperative control scheme of Thyristor Controlled Series Compensator (TCSC) and Static Synchronous Compensator (STATCOM) is proposed in this study. The proposed scheme is applied in the wind power grid‐connected system, a combined control strategy based on STATCOM double closed‐loop feedback control and TCSC device is used to ensure that the system has enough reactive power to maintain its normal work during operation. The corresponding simulation model of wind power grid‐connected system is built in MATLAB/Simulink. By analysing and comparing the waveforms of the operating examples with only TCSC, only STATCOM and TCSC‐STATCOM, it is shown that the cooperative control of TCSC and STATCOM can quickly and effectively recover the bus voltage at the point of grid‐connected wind farms after fault, which has a good performance on improving the voltage stability of wind power grid‐connected system and increasing the low‐voltage ride‐through capability, and the cooperative control effect of TCSC and STATCOM is better than only using the control of TCSC or STATCOM.
Seasonal variations in source regions of the dust jets on comet 67P/Churyumov-Gerasimenko
Authors: Lai I.-L. , Ip W.-H. , Lee J.-C. , Lin Z.-Y. , Vincent J.-B. , Oklay N. , Sierks H. , Barbieri C. , Lamy P. , Rodrigo R. , Koschny D. , Rickman H. , Keller H. U. , Agarwal J. , Barucci M. A. , Bertaux J.-L. , Bertini I. , Bodewits D. , Boudreault S. , Cremonese G. , Da Deppo V. , Davidsson B. , Debei S. , De Cecco M. , Deller J. , Fornasier S. , Fulle M. , Groussin O. , Gutiérrez P. J. , Güttler C. , Hofmann M. , Hviid S. F. , Jorda L. , Knollenberg J. , Kovacs G. , Kramm J.-R. , Kührt E. , Küppers M. , Lara L. M. , Lazzarin M. , López-Moreno J. J. , Marzari F. , Naletto G. , Shi X. , Tubiana C. , Thomas N.
Published: October 2018

Aims. We investigate the surface distribution of the source regions of dust jets on comet 67P/Churyumov-Gerasimenko as a function of time.

Methods. The dust jet source regions were traced by the comprehensive imaging data set provided by the OSIRIS scientific camera.

Results. We show in detail how the projected footpoints of the dust jets and hence the outgassing zone would move in consonance with the sunlit belt. Furthermore, a number of source regions characterized by repeated jet activity might be the result of local topographical variations or compositional heterogeneities.

Conclusions. The spatial and temporal variations in source regions of the dust jets are influenced significantly by the seasonal effect. The strong dependence on the solar zenith angle and local time could be related to the gas sublimation process driven by solar insolation on a surface layer of low thermal inertia.
Impact of human activities on the quality of groundwater at Dobra intake in Jaworzno
Authors: Zimoch Izabela , Kręcichwost Sylwia
Published: October 2018

The paper identifies the causes of contamination and analyses changes in the quality of underground water resources at the Dobra intake, which supplies water for a separated group of Jaworzno inhabitants. The analysis takes into consideration such aspects as land conditions and their influence on physicochemical changes of water taken in in relation to the effective legal requirements for potable water. Moreover, an integral part of analysis of potential threats was an assessment of the effect of closed municipal waste disposal site and mining activity on the quantitative and qualitative resources of underground water in the area supplied by the Dobra intake in Jaworzno.
Properties of catalyst for iron and manganese oxidation in filter materials
Authors: Jeż-Walkowiak Joanna , Komorowska-Kaufman Malgorzata , Dymaczewski Zbysław , Sozański Marek M. , Zakrzewski Przemysław
Published: October 2018

The aim of this work is to determine the properties of contact layers of grain of different type of filter media in term of their suitability for catalytical manganese oxidation and auto-activation for manganese removal from groundwater. The following oxidative filtration materials were investigated: auto-activated silica sand taken from full-scale filters (oxide coated filter media), Pyrolox – manganese ore – natural material and Hydrolit – artificially activated material. As a reference two natural not chemically active materials were tested: clean silica sand and clean chalcedonite. The investigation resulted in chemical composition and microstructure parameters of catalyst contact layers of grains. The modern analytical methods were used: EDAX, Raman spectroscopy, mercury and helium porozymetry. The data indicated that catalyst from autoacivated filtration material has better chemical composition and porosity parameters in comparison to tested catalytic filtration materials, making it more suitable for adsorption and catalytic manganese oxidation.
Experiment in infiltration studies as a water treatment process
Authors: Kołaska Sylwia , Jeż-Walkowiak Joanna , Dymaczewski Zbysław
Published: October 2018

This article contains the concept of research methodology of the water infiltration process. The described research was conducted at Dębina intake in Poznan, Poland. Based on the temperature variation curves, it was possible to determine the water retention time in the ground during the flow of water from the infiltration pond through piezometers to the collecting well
An evaluation of the adsorption process in removing organic substances in a pilot flow-type surface water treatment system
Authors: Wolska Małgorzata , Mołczan Marek , Szerzyna Sławomir , Adamski Wojciech , Wiśniewski Jacek , Ferenc Zbigniew , Sambor Aleksandra , Żółtowska Małgorzata
Published: October 2018

This article presents the results of the adsorption process effectiveness in treating surface water, especially in removing organic substances. The effectiveness of the adsorption system was evaluated at different levels of adsorption capacity exhaustion of the activated carbon bed, which was possible due to replacement of the beds during the study period. Studies have shown that among the removed substances, chlorinated disinfection byproduct precursors dominated, and during the period preceding bed replacement, the biological activity of microorganism populating the activated carbon ensured a reduction in not only organic but also non-organic food substrates. In such a adsorption bed populated with microorganism a nitrification process took place, indicating a high degree of process stability. Replacing the adsorption beds provided a significant increase in the effectiveness of removing organic substances, especially those absorbing UV light, therefore removing chlorinated organic disinfection by-product precursors.
Methods of routing and sizing of water supply networks
Authors: Suchorab Paweł , Kowalski Dariusz
Published: October 2018

One of the first steps in water distribution systems (WDSs) design process is the pipeline routing, defined as geometrical projection of a designed network. The analogical step can also be found in designing of other elements of technical infrastructure, such as energy lines or roads. Moreover, the pipeline routing process influences pipe’s sizing and determinates investment, exploitation and maintenance aspects of the whole WDS. Despite its significant meaning, the routing process is still unsatisfactorily supported by mathematical methods and computer aided tools. Therefore, there are continuous researches of more effective pipeline routing and sizing methods. This paper presents a literature review about currently developed methods of network routing and methods of optimal pipeline sizing.
Self-regulating roof-bolting with the rock pressure energy use
Authors: Khomenko Oleh , Kononenko Maksym , Kovalenko Ihor , Astafiev Denys
Published: October 2018

The perspective of discovery of zonal disintegration phenomenon of rocks around underground mine workings is analyzed. The methodological stages for research of this phenomenon are shown. The physics of zonal disintegration of rocks around underground mine workings is disclosed. There are described the possibilities of advanced entropy method and developed energy method that allow to investigate a phenomenon of zonal capsulation of underground mine workings. The sequence of research of this phenomenon parameters is presented. The order of choice of stable shape and resource-saving support in underground mine workings is substantiated, for the deep horizons of the Kryvorizkyi Iron-Ore Basin mines. The method of parameters calculation of self-regulating roof-bolting in underground mine workings is substantiated, which allows to use the rock pressure energy. The design of a self-regulating roof-bolting is developed, which allows applying metal, polymer and rope bolts. The economic efficiency of rock pressure energy usage is substantiated in case of support setting at great depths in underground mine workings.
A modern vision of simulation modelling in mining and near mining activity
Authors: Dychkovskyi Roman , Falshtynskyi Volodymyr , Ruskykh Vladyslav , Cabana Edgar , Kosobokov Oleksandr
Published: October 2018

The paper represents the creation of the software simulation system, which reproduce the basic processes of mining and near production. It presents the consideration of such systems for both traditional and non-traditional mineral extraction systems. The principles of using computer recognition of processes are also presented in other processes of carbon-containing raw materials transition, as well as power production and waste utilization of mining production. These systems considerably expand the manageability of a rather complicated mining enterprise. The main purpose of such research is the simulation reproduction of all technological processors associated with the activity of mining enterprises on the display of the dispatch center. For this purpose, is used so-called UML-diagrams, which allows to simulate mining and near mining processes. Results of this investigation were included to the Roman Dychkovskyi thesis of the scientific degree of the Doctor of the Technique Sciences “Scientific Principles of Technologies Combination for Coal Mining in Weakly Metamorphoses Rockmass”.
Improving the process of coal extraction based on the parameter optimization of mining equipment
Authors: Hrinov Volodymyr , Khorolskyi Andrii
Published: October 2018

The aim of this paper is to develop and validate methods of choosing the means of the mining face mechanization. This paper analyses existing methods of optimizing processes in mining. It was established that the effectiveness of the performance map of coal field is formed by a group of technological, operational, and economic parameters which can be represented as a vector of solutions. To find the optimal solution, it was suggested to use network models and graphs. The essence of the technique is to represent the input and output (production level, prime cost) resource flows in an organized structure. Regularities of forming technological schemes of coalfield operation with a given level of performance, taking into account the relationship between technological parameters of mining face, operational parameters of the stoping equipment, technical and economic performance are defined. We developed the system for decision-making support, which allows optimizing operational parameters, reducing the production prime cost, and selecting the structure of the mechanized complex of stoping equipment with a specified level of performance. This paper describes approaches that can be used at the design stage of mining face and in the process of operation.
Specifics of hydro-loosening of coal seams with account of rocks displacement parameters
Authors: Zberovskyi Vasyl , Bubnova Olena , Babii Kateryna
Published: October 2018

The analysis of efficiency decline of methods for hydraulic influence on outburst-prone coal seams in the conditions of large depths is represented. The models are considered for parameters calculation of high-pressure liquid injection, based on the hypotheses of the stress-strain state formation of the coal seam; the patterns of rock pressure manifestation as well as calculation discrepancy between the liquid injection pressure and the terms of large depths, are established. It is shown that in the parameters calculation of the high-pressure liquid injection, it is necessary to take the height of the column of rocks which lost their integrity and form the stratification zone in the underworked massif instead of depth Н of the seam mining. It has been established that the efficiency of hydro-loosening depends not only on the injection pressure, but also on the location of borehole filtration part relative to the maximum of abutment zone.
Aboveground storage of hydrocarbon gas hydrates
Authors: Zotsenko Mykola , Pedchenko Larysa , Manhura Andrii
Published: October 2018

The work objective is to substantiate the technical bases for the production of gas hydrate blocks directly on-site for further transportation and storage in above ground storages, as an alternative to transporting and storing gas in underground gas storages. The theoretical bases have been considered and processes of gas hydrate blocks producing, physical-mechanical characteristics of artificial hydrates with the purpose of determining the conditions of their storage and prolonged storage were tested in laboratory conditions. The construction of above ground gas hydrate storage in the form of a building, partially deepened in a ground, which is separated from the environment by a wall of gravel cement elements made by the mixing method were substantiated. It is proved that such a constructive solution for a long-term storage of gas hydrate blocks is the most economical in terms of energy consumption to maintain internal negative temperature.
Scientific-practical results of monitoring anthropogenic influence upon environment of mining territories
Authors: Kachurin Nikolay , Komaschenko Vitaliy , Golik Vladimir , Morkun Volodymyr
Published: October 2018

The objective of this paper is to improve the ecological monitoring system and to take effective technological measures by way of wastes neutralization. The scientific-practical results of monitoring the anthropogenic influence upon the environment of mining-industrial territories were discussed. The global environmental problems of modernity are connected only with the anthropogenic pollution of the atmosphere. Pollution by hazardous substances at various enterprises harms health and disrupts the dynamic balance of natural systems. It is especially typical for mining-industrial region territories. The solution of the problem of environmentally optimal distributing resources for industrial enterprises of the mining-industrial region will allow making maximal profit from each enterprise by assumption of reducing anthropogenic influence upon environment up to the maximum permissible value, which is specified by normative documents. The patterns of formation of mining enterprises influence consequences on the atmosphere have been improved with the use of experimental and theoretical studies and in order to optimize the resources distribution for preventive measures, which can ensure the atmospheric safety of the mining-industrial region. The proposed methodological principles for a comprehensive assessment of the atmosphere of the mining-industrial region allow to implement an integrated approach to forecasting the intensity of atmospheric pollution, the economic efficiency of production and atmospheric air condition control, using the basic requirements of the environmental imperative for the territory under consideration.
Parameters of selective martite ores disintegration in structured ore bodies deposits by borehole hydraulic monitors
Authors: Stupnik Mykola , Tarasiutin Viktor , Fedorenko Pavlo
Published: October 2018

The work is aimed at determining parameters of advance borehole stoping by hydraulic monitors leading to rational use of reserves structured according to ore types at deposits by means of advance stoping with selective disintegration of high-grade martite ores. The research methods include experimental investigations of parameters of breaking a high-grade martite ore massif by high-pressure water jets of borehole monitors; laboratory studies of technological properties of hydrodisintegrated products and their concentratibility; theoretical generalization of experimental data. The research has resulted in developing experimental borehole hydraulic monitors and determining basic technical parameters of high-pressure water jets; determining regularities of hydraulic monitor disintegration of high-grade martite ores considering structural and mineralogical characteristics of the ores and hydrodisintegration modes; proving the fact that the process of high-grade martite ore disintegration by monitors is also the process of ore disintegration to the level of ore mineral grain release providing the higher quality disintegration product after subsequent dewatering than that of the initial one. The scientific novelty of the research consists in determining a criterion of hydrodisintegration of martites, conditions of forming a required fractional composition of monitor disintegration products through controlling stability of a pulse of the water jet action on the stope face. The practical relevance of the monitor breaking process in conditions of mining units at deep levels of Kryvbas underground mines consists in providing advanced stoping of rich martite ores through raises and obtaining a new kind of product – martite superconcentrate.
Physical simulation of integrated protective structures
Authors: Nehrii Serhii , Nehrii Tetiana , Piskurska Hanna
Published: October 2018

An effective way of protecting development workings by integrated rock wall structures is considered. The necessity of improving this method and its experimental verification is substantiated. Integrated rock wall structures are experimentally tested under laboratory conditions. On the basis of the results of physical modeling, parameters of integrated structures have been specified in terms of impact factors; their yield strength is also specified. The condition for ensuring the stability of the integrated protective structure, which allows calculating appropriate rock wall width, is determined.
Exploring Air Properties for fMRI-Compatible Interaction Devices
Authors: Aulia Putra Handityo
Published: October 2018

The strong magnetic field of functional magnetic resonance imaging (fMRI) and the supine position of participants in fMRI scanners severely limit how participants can interact during fMRI experiments. This paper explores the use of air properties to design interaction-device systems that allow various interaction styles inside a fMRI scanner. Airflow and air pressure are explored to design and develop the interaction system. A series of air-based devices are introduced and discussed to demonstrate the feasibility of an air-based approach. This includes soft tactile and conventional controls (e.g., button, slider, joystick, pedal). To achieve fMRI-compatibility, all parts used inside the scanner are built from non-ferromagnetic, off-the-shelf plastic, and/or 3D printed materials. The fMRI compatibility was evaluated on a 3.0 Tesla fMRI scanner. We conclude with example applications and thoughts on future avenues of research.
Comparison Analysis of Simple Additive Weighting (SAW) and Weigthed Product (WP) In Decision Support Systems
Authors: Wira Trise Putra Dede , Agustian Punggara Adrian
Published: October 2018

Decision support system is a way to help decision maker to choose the best decision from several available alternatives. In the process of decision support system required criteria and weights to be used in the calculation process. Simple additive weighting (SAW) and Weigthed product (WP) are methods in decision support systems that have a search method taking into account the weights held by the criteria. comparison analysis is performed to look at between the WP and SAW methods, methods that have a higher level of accuracy and are in accordance with the conditions. The SAW method uses a weighted weaning system whereas the WP method uses multiplication in calculating the attribute rating. From the weight of each criteria there will be used in the calculation to produce several alternatives. The object of the case study in this study is the determination of people’s business credit in the banking world using seven criteria. the criteria used are personal character, credit status, business condition, income, guarantee, guarantee condition and installment. Results of testing using SAW method and WP method, it can help compare the best alternative level results by using the same data and criteria, so both methods can be used as consideration in decision making. WP method gives clear cost and benefit value compared to SAW, but in SAW result gives more clear result because it is based on predetermined value and weight.
Data Logger Development to Evaluate Potential Area of Solar Energy
Authors: Effendi Asnal , Dewi Arfita Yuana , Ismail Fauzan
Published: October 2018

The data logger was developed to evaluate potential area of solar panel. Current sensor and voltage sensor were integrated on data logger board to measure parameter that affected toward efficiency of PV system. The obtained Calculation power will be used for assessment and evaluation during collecting data. But, Maximum Power Point Tracking (MPPT) method will provide an efficient data of peak power. The benefit of using data logger is the ability to automatically collecting data on several period. The data can be plotted into V-I graph and P-V graph for analysis. The test bench result was recorded that the maximum power reaches 35W. This data logger with MPPT method can be used as portable recorder to compare the power in different area.
Methods of calculation of energy losses of the refrigerator when opening its doors
Authors: Petrosov S.P. , Lemeshko M.A. , Kozhemyachenko A.V. , Bashnjak S.E.
Published: October 2018

The problem of energy supply and the problem of energy efficiency of energy consumers are global problems. In the modern world, scientists pay much attention to the tasks of creating new and improving traditional sources of electricity. The tasks of increasing the energy efficiency of electricity consumers remain relevant in the global economy. One of the relatively capacious energy consumers is the Park of refrigerators, household and commercial purposes, which are also being improved in order to increase their energy efficiency. Modernization and improvement of household and commercial refrigerators include the task of designing and using more efficient refrigerators. Energy consumption of compression refrigerators, along with other operational factors, depends on the processes of heat exchange and mass transfer of air from internal chambers to the ambient air. When the doors of the refrigerator chambers are opened, the cooled air in the chambers is replaced with the warmer air of the environment. This process causes the cost of operation of the refrigeration machine and characterizes its energy consumption. In order to minimize this power consumption, knowledge of the process of cool air outflow of their open refrigerator chambers is required. Currently, this process is poorly understood. The article presents an approach to the description of the process of motion of the cooled air from the refrigerator chamber, the main assumptions necessary for the construction of a mathematical model of this process are given, and a method for calculating the heat in the refrigerator chambers associated with the replacement of the cooled air with the ambient air inside the chambers is proposed. The method is based on the laws of gas dynamics, supplemented by some experimental studies. In particular, the well — known Navier-Stokes equation is used as the initial basis. This equation supplemented by the continuity equation of the air flow and other functional dependencies. As a result of mathematical transformations and arguments about the physics of the mass transfer process, finite equations are obtained, which allow describing both the performance of the cooled air flow and the amount of heat introduced into the chambers by external warm air. Mathematical dependences are developed for calculation of parameters of motion of a stream of the cooled air and heat inflows, thus the temperature of ambient air and temperature in chambers of the refrigerator are considered. The results of the research will be useful in the design of new refrigerating machines with reduced energy consumption.
Study of Coordination on Protection Relay in High Voltage Transmission 150 kV (Payakumbuh – Koto Padang, West Sumatra)
Authors: Zulkarnaini Zulkarnaini , Rizki Muhammad
Published: October 2018

The disturbance of the high voltage transmission can be caused by a short circuit, overload, lightning surge, and other natural disturbances. That disturbance can lead to disruption of the distribution of electricity and damage to the electric power system installation equipment. A reliable protection system that can identify the disturbance quickly and also can securing affected parts of the system from other parts that can still operate normally are needed. Protection system operation may fail due to various factors; therefore, in addition to primary protection required backup protection that can work as primary protection fails to work. Distance relays can be used as primary protection as well as remote backup protection on high-voltage transmission. While overcurrent relay (OCR) and ground fault relay (GFR) is used as a local backup if distance relay failed to work. This research conducted a study of protection relays coordination for primary protection or backup protection on the high-voltage transmission that connects to Payakumbuh substation and Koto Panjang substation. Coordination is done by calculating the distance relay settings that use as primary protection as well as remote backup protection relay settings and calculating the overcurrent and ground fault relay that used as local backup protection. From the calculation, we get setting time to coordinate distance relay, overcurrent relay, and ground fault relay. Setting time was conducted to the first zone of the distance relay within 0 sec, and the second zone within 0.4 sec and third zone within 1.2 sec. For overcurrent relay and ground fault relay use time delay 1 second where the value is above the value that used in the second zone of distance relay. Distance relay can be coordinated with the auto-reclose relay to close the circuit breaker automatically sometime after a temporary disturbance. Setting that use to auto reclose relay is dead time 1 second and reclaim time 40 second. The coordination between the distance relay with auto-reclose relay can improve the quality of distribution of electrical energy.
Tower-Footing Resistance and Lightning Trip-outs of 150 kV Transmission Lines in West Sumatra in Indonesia
Authors: Warmi Yusreni , Michishita Koji
Published: October 2018

The trip-out rates calculated by taking account of the reduction in the tower-footing resistance due to the ionizing effect agree well with the observed ones. This indicates the importance of the impulse resistance in the analysis of the lightning performance of the line. The trip-out rate at the lower arm is high for the cases of the average grounding resistance of 33.3 ohms, and the rates at the upper arm are high for the cases of the average grounding resistance of 5.6 ohms. Such à trend can be simulated by the IEEE method using the impulse resistance. The trend for the trip-out ratio to become high with the increase in the span length is significant after improvement of the tower-footing resistance. However, the trend is weak before improvement of the tower-footing resistance. This is because in the case of the high tower-footing resistance the flashover occurs before the arrival of the wave reflected from the adjacent towers due to the high potential rise of the tower. Therefore, the degree of the influence of the span length on the trip-out ratio is dependent on the tower-footing resistance. The local lightning activity significantly affects the trip-out rate.
The Effect of Fly Ash Composition and Drying Time Concrete Brick in Density Test
Authors: Nurzal  , Perdana Mastaryanto , Putera Heru Pratama
Published: October 2018

This study uses the fly ash (FA) from coal combustion power plant Sijantang Sawahlunto. By utilizing fly ash in concrete brick can reduce the negative impact on the environment, composition of fly ash in concrete brick at 0, 5, 10, and 15 wt.% FA concrete brick added material (sand, cement and water as a binder). Influence of drying time 7, 14, 21, 28, and 35 days. Test specimen based on SNI 03-0349-1989, with size of 34 x 12 x 9 cm. The results showed that the composition of 5 wt.% fly ash with 28 days drying time was found to be the highest density with 2,230 gr/cm3, while the lowest density in the composition test was 15 wt.% fly ash with 35 days drying time with the density 1,946 gr/cm3. In this study, the density of normal concrete brick density with density 2,208-2,230 gr/cm3 and light concrete brick density of 2,000-1,946 gr/cm3, and also found a normal and light concrete brick category that is 2,022-2,053 gr/cm3.
Experimental Tests and Analytical Studies of Bearing-Type Axial Steel Connection
Authors: Pranata Yosafat Aji , Sulandari Noek , Milyardi Roi
Published: October 2018

The capacity of the bolted connection on steel tensile rods can be determined through capacity analysis and connection failure. In term of capacity analysis and failure of steel tensile connection, the specified tensile connection capacity is generated based on several parameters such as cross-section of rod, grade of steel, thickness and grade of the steel plate, and grade and diameter of bolts. The capacity of steel tensile connections as a result of capacity analysis and connection failure often has a lower value than the connection capacity in real conditions. In this research, the comparison of 30x30x3mm angle cross-section connections with BJ37 grade quality was connected with 2 mm steel plate (also BJ37 grade) using 8 mm bolt connectors (A307 grade), through capacity analysis, failure study, and experimental study with type of failure is bolt bearing failure. In the capacity analysis study and the failure of steel tensile connections obtained a nominal capacity is 14.21 kN with the type of failure is shear failure. In the experimental study was tested 3 specimens, the average value of ultimate capacity was 18.67 kN and the failure for all of the three specimens are shear failures. The conclusion that can be drawn from this research is both the result of analytical calculations and experimental testing in the laboratory showed a good agreement and have the same trend. The test specimens were designed on the basis of analytical calculations for bolt bearing failure, experimental test results for all of three specimens all showed a failure pattern of bolt shear. The nominal strength from the results of the analytical study with the ultimate load of the experimental study results has a difference of 31.4% with higher experimental results. Through this research is expected to be a learning-media to know one type of failure on the steel connections that is bolt shear failure, obtain a comparison between analytical calculation results referring to applicable design standards, and the results of experimental testing in the laboratory.
Design of Structural Damage Identification Applications Web-Based
Authors: Anisya Anisya , Nugroho Fajar
Published: October 2018

The current building construction and maintenance Note well, certainly will be utilized as desired. If a building is experiencing interference, then all activities will be obstructed so that the building requires maintenance activities. Building maintenance activities include the maintenance of the structure, architectural, mechanical, electrical, and outer space. On systems that are running now the surveyor directly monitor to location which requires a fee and take a long time. Technology websites that are built can be used for building maintenance activities in the form of a data string entered by the Manager of the building and the response of the Contracting Party. With this technology produces a system that can help in the process of monitoring a building that suffered damage and need repair.
Collective Intellectual Right? A Case on Protected Geography Indicated
Authors: David Firmansyah , David Wahyudi
Published: October 2018

Many literature in the collaboration of innovation have suggested inventors should avoid the join ownership of intellectual property. However, in a special case the intellectual right can be assigned to a product. Our paper addresses the issues and challenges of shared intellectual right in the context of Protected Geography Indicated (PGI). The PGI recognizes such products based on their originality (in term of geography), not based on who have been invented them. This highlights that the right is belong to a community, not to individuals. In practice, this is problematic in which individuals in a community may or able to claim the right on the product. To illustrate how policy makers in developing country deal with this situation, we use secondary data from Indonesian Agency on Intellectual Property and case studies on indigenous food products. We approached the cases using theory of resolving potential conflict in community. The discussion in our contribution is taking aim at identifying of problems of which may be occurred during the process of Intellectual Right application. Further, we propose recommendations for individual, communal, and policy levels to resolve potential problems in the future.
Influence of Product Quality, Price and Supporting Infrasturcture to Perceived Value and Interest in Buying of Electric Motorcycle
Authors: Rahmanullah Edwin Sholeh , Nurjanah Siti
Published: October 2018

Energy consumption in Indonesia always increase every year. Transportation sector is the highest energy increase among other sector, totally transportation sector consump 35% energy. Motorcycle, especially automatic type is dominate population of vehicle. This research want to know the influence of several factor to the interest of buying electric motorcycle. From research result we can conclude that product quality, price and supporting infrastructure have positive influence to both of perceived value and interest in buying of electric motorcycle. Direct relation between those three factors to interest in buying electric motorcycle is higher than indirect relation when through perceived value. For example comparing direct effect of product quality is 0,147 to indirect effect is 0,04674. Other data from this research, 91% of the respondents can accept if the speed of an electric motorcycle under 100 km / hour. In general most respondents or 97.5% of respondents require mileage > 50 km for one time battery charging. Total 85% of respondents can accept charging time over 1 hour. Total 95% of respondents can accept a price range between 10 - 30 million rupiah for each unit of electric motorcycle. For infrastructure, respondents who want a feature of charging directly (charging) and replacement batteries (swap) on electric motorcycle, desired by more than 86% of respondents.
The Constraints of Agricultural Credit and Government Policy Strategy
Authors: Herliana Sri , Sutardi Acip , Aina Qorri , Himmatul Aliya Qonita , Lawiyah Nur
Published: October 2018

Low access to credit in the agricultural sector is also caused by problems of agricultural sector actors (especially farmers) and financial institutions. Farmers are still having difficulty in accessing credit (accessibility and unbankable) and the limited financial institutions that channel credit to the agricultural sector. Therefore, the government must issue a policy in growing the agricultural sector, especially in anticipation of access credit constraints by farmers. The agricultural sector as a high-risk business, therefore formal institutions are less interested in financing the agricultural sector on the grounds of high transaction costs, asymmetric information, low profits, lack of collateral, education of farmers is relatively low. In addition, most banks do not want to finance agriculture due to fluctuating production and uncontrolled price risk. While the constraints of the farmers in obtaining formal credit is a complex procedure, there should be collateral as well as high payment delay fees, long distances and less information about capital.
Quality Analysis Of Organic Rice Variety Mentik Susu And Sintanur Nutritional Approach
Authors: Handayani Sri , Affandi Muhammad Irfan , Astuti Sussi
Published: October 2018

Organic rice production in Indonesia is increasing due to the tendency of consumers who start to consume healthy food and one of them is organic rice. Varieties cultivated by farmers in Lampung Province is mentik susu and sintanur based on high yields and climate suitability. The quality of organic rice can be known through nutritional approach. The purpose of this research is to analyze quality comparison of organic rice of mentik susu and sintanur varieties with nutritional approach. The research methodology used is laboratory research. Data analysis methods used to answer the objective of a proximate test to determine the nutrient content of organic rice in both varieties of mentik susu and sintanur. Nutritional content that is cultivated is carbohydrates, fats, proteins, water, fiber, and ash content. The result of the analysis shows that carbohydrate, protein, and nutrient content of organic rice of mentik susu variety was higher than sintanur varieties. While the fat content, water content, and ash content of organic rice varieties mentik susu is lower than the sintanur varieties. In general it can be concluded that the quality of organic rice varieties mentik susu better than sintanur varieties.
Indonesian Cultural Preference in Designing User Interface
Authors: Persada Andhika Giri
Published: October 2018

Interface design is the first thing users can see when accessing website. First impression is presented here. If they feel interested, users will continue exploring website. But, if they feel not interested, users will leave website with negative impression. They will be reluctant to access the website in the future, because the first impression is not good. In order to design good and interesting interface design, there is no particular methods can be used to absolutely measure it. Measuring the interface design is closely related with the domain of social behavior. Each user has different perspective, which means has different taste of design. So far, there is no existing method that can be used to measure the taste of interface design accurately. Interface design tend to be measured subjectively. The only way to measure interface design is use usability principles, which is tend to focus on the interaction not to the interface design itself. Indonesia has there are 1331 tribes across the country which are have unique and richness of cul-tural ornament. Their ornament has known well by people because it had been applied into their various kinds of product, such as carving, clothes, and house. Finally, the purpose of this research aim to provide new idea about cultural preference in order to design the interface. At the end of this research, we offer methods which can be used to ensure the interface design based cultural is met with the usability principles.