bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis and Design of Filament Power Supply with Voltage-Fed Single-Switch ZVS Inverter
Authors: Yueh-Ru Yang
Published: November 2018

In this paper, an off-line voltage-fed single-switch zero-voltage-switching (ZVS) inverter is analyzed and designed for the filament power supply of cooker magnetrons. Due to the low resistance of cathode filament, an isolation transformer with large turn ratio is used. To obtain the ZVS operation, a parallel-resonant capacitor is connected to the primary of transformer. The capacitor, transformer and filament constitute a parallel resonant tank. Both the transformer leakage inductance and the transistor output capacitance are merged into the resonant tank. The resonant energy provides the ZVS operation of the inverter switch, and the secondary voltage drives the cathode filament. To verify the analysis, a prototype inverter is built and tested. Experimental results validate the circuit design.
The Load Distribution of the Main Shaft Bearing Considering Combined Load and Misalignment in a Floating Direct-Drive Wind Turbine
Authors: Jingyang Zheng , Jinchen Ji , Shan Yin , Van Canh Tong
Published: November 2018

The main shaft tapered double-inner ring bearing (TDIRB) of floating direct-drive wind turbine system (FDDWT) is one of the most critical components in FDDWT, and its failure accounts for a large proportion of wind turbine malfunctions and faults. Over the past decades, a significant number of methods have been proposed to calculate the contact load distribution along the roller length in TDIRB, since the contact load distribution of roller is the key factor of fatigue life of TDIRB. Most of methods, however, neglected the misalignment of inner ring with respect to outer ring and friction force. In this paper, with the help of comprehensive and accurate quasi-static mathematical method, the contact load distribution of internal loads in TDIRB are analysed by considering the effects of combined loads, angular misalignment and friction force at different wind speeds for FDDWT. The simulation results show that the amount of combined load has an apparent effect on the contact load distribution along the TDIRB raceways and flanges in both rows. Furthermore, the slight change of tilted misalignment has a great influence on the contact load distribution. In addition, the slight angular misalignment easily produces noncontact zone for the bearing raceway in both rows, which is significantly disadvantage for the external load uniform transmitting to each roller.
Outlier Detection Methods for Uncovering of Critical Events in Historical Phasor Measurement Records
Authors: André Kummerow , Steffen Nicolai , Peter Bretschneider
Published: November 2018

The scope of this survey is the uncovering of potential critical events from mixed PMU data sets. An unsupervised procedure is introduced with the use of different outlier detection methods. For that, different techniques for signal analysis are used to generate features in time and frequency domain as well as linear and non-linear dimension reduction techniques. That approach enables the exploration of critical grid dynamics in power systems without prior knowledge about existing failure patterns. Furthermore new failure patterns can be extracted for the creation of training data sets used for online detection algorithms.
Comparison of Blade Dimension Design of a Vertical Wind Turbine Applied in Low Wind Speed
Authors: Yuliandi Rizky Brillian , Rusdianasari  , Dewi Tresna
Published: November 2018

The type of vertical turbine used for this research was a savonious where the profile of the blade was made in the form of a half-cylinder. The performance of the turbine rotation was strongly influenced by the swept area. Drag and lift force was influenced by the swept area. Both of the forces had its own advantages and disadvantages. Because of that, the dimensional engineering was implemented to obtain the optimal performance of the turbine. Experimental dimensions were tested with the variation of height size (H = 40 cm and 60 cm) and diameter size (D = 40 cm and 60 cm). The distance between the blades known as the overlap ratio was related to the dimensions. Overlap ratio has a role to the upwind and downwind wind flow because the overlap ratio changes affect the swept area. The experimental variation of the overlap ratio was at the distance of 0 cm and 10 cm. The experimental results concluded that the best turbine performance was obtained during wind turbine testing with H = 40 cm and D = 60 cm on primary overlap value minus 10 cm and secondary overlap 0 cm.
The Quality of Life Chronic Renal Failure (CRF) Patients in Hemodialysis Unit at District General Hospital Pringsewu Regency Lampung Province in 2018
Authors: Saputri Virna Widora , Sitorus Rico Januar , Zulkarnain H. M.
Published: November 2018

The purpose of this study was to determine the factors that affect the quality of life of CRF patients in Hemodialysis Unit at Pringsewu District General Hospital. This study was conducted from February to May 2018 with cross sectional study design. The sampling technique using total sampling technique. Measurement of quality of life using KDQOL-SFTM version 1.3. The results found that quality of life scores were quite low in some domains and subscales. The mean of total score was 55.70 ± 21.30 with mean of Physical Health Composite (PHC) = 38.85 ± 9.26 and mean of Mental Health Composite (MHC) = 36.13 ± 7.08. Regarding the targeted area of ESRD, the scale of renal disease burden and occupational status scale resulted in the lowest score. The sleep quality scale score was 56.18 ± 20.72. Only 61 patients responded to questions of sexual activity with a score of 55.53 ± 27.44 on the scale of sexual function. In the 36-item health survey, the mean total score was 45.90 ± 21.95. The lowest score represented the limitations of roles caused by physical and emotional health problems. The result of statistical test showed that the variables significantly related to the quality of life of CRF patients were age, income, duration of hemodialysis and family support. Thus, family support was the variable that had the greatest impact on determining the quality of life of CRF patients. The CRF patients who lacked family support were 4.6 times more likely to lead poorer life compared to CRF patients who received good family support after being controlled by age, income, duration of hemodialysis, gender, working status, and diabetes mellitus variables.
The Effect of Morphology on the Biodegradation Behavior of Porous Magnesium Bone Scaffold
Authors: Basri Hasan , Syahrom Ardiansyah , Saad Amir Putra Md , Rabiatul Adibah AR , Akbar Teguh Prakoso , Diansyah Apreka , Putra Risky Utama
Published: November 2018

The purpose of this study is to analyze the influence of morphology on the degrading behavior of porous magnesium bone scaffold by using computer simulation. Based on the experimental work, the three bone scaffold prepared with 30%, 41%, and 55% of porosity, respectively. The bone scaffold made of pure magnesium that immersed in simulated body fluid (SBF) for 72 hours with constant flow rates of 0.025 ml/min. After degradation, each specimen was scanned by μCT with a resolution of 17 μm. In this study, three different morphology before and after degradation was performed by computer simulation using the FSI method. Each specimen before and after degradation were given different bone strain (1000-3500 μstrain) that create displacement variations on the bone scaffold. Before degradation, the outcomes showed that the variation of displacement affects fluid characteristic change and for the specimen C (55% of porosity) generates the highest permeability with the value of 8.78 × 10-10 m2. After degradation, specimen A (30% of porosity) has a higher average shear stress of 2.04 × 10-3 Pa, specimen C (55% of porosity) has degradation rate of 3.37 mg/cm2/d and the highest porosity of 75.81%.
The Risk Factors Analysis Occurrence of Chlamydia Infection to Direct Female Seks Workers (DFSW) in Indonesia
Authors: Rabiah Masayu Gemala , Mutahar Rini , Sitorus Rico Januar
Published: November 2018

Chlamydia infection is one of the most common sexually transmitted infections worldwide. Based on data of IBBS 2015 in Indonesia, the highest prevalence of chlamydia occurred in direct female sex worker group (32.21%). This study a STIs to determine the risk factors for chlamydia infection in direct sex workers. This research uses Cross-Sectional study design. The population of this study were all direct female sex workers as many as 3,789 people with samples in accordance with inclusion and exclusion criteria as many as 3.114 people. The prevalence of direct female sex workers with chlamydia infection was 1.018 (32.4%). The result of the analysis showed that there was a relationship between age (PR: 0.541 95% CI: 0.456-0.643) and length of work as FDSW (PR: 1,.60, 95% CI: 1.087-1.512) chlamydia infection in female sex workers in Indonesia. most dominant variable has an effect on the incidence of chlamydia infection that is long working as FDSW after controlled by age (PR 1.282 95% CI: 1.087-1,.12). It is expected for the government to improve the implementation of prevention program of chlamydia not only among female sex worker but also proactive to customer.
Model of Demand Robust Counterpart Open Capacitated Vehicle Routing Problem (DRC-OCVRP) Simplification by Applying Preprocessing Techniques in Rubbish Controlling in Sematang Borang District, Palembang
Authors: Puspita Fitri Maya , Cahyono Endro Setyo , Rahayu Siti , Sintia Bauty Lisna
Published: November 2018

The activity of rubbish controlling in Palembang is one of the applications of Demand Robust Capacitated Vehicle Routing Problem (DRC-OCVRP). In transporting rubbish in Sematang Borang district by preprocessing and probing technique are needed to obtain the simplest DRC-OCVRP model. The result shows that the optimal routes in those districts after applying the techniques are the same routes. In addition, the reduction of constraints, variables and the reduction of iteration numbers are also obtained. For Sematang Borang district, the reducing is mostly done on the working area 2 (WK 2) that is reducing as much 9 variables and 8 constraints of the initial number of variables as much as 36 and 66 constraints that has been previously obtained in the past research.
Do Cultural Styles Predict Pro-Environment Behaviour among Slum-area Resident of Jakarta?
Authors: Gumelar Gumgum , Vania Ayuza , Maulana Herdiyan
Published: November 2018

Promoting pro-environmental behavior is essential to ensure the sustainable living environment was preserved. The cultural aspect is considered one of the critical determinant in predicting pro-environmental behavior. However, the interplay between these aspects was still open for further discussion, particularly in Indonesia. This study was aimed to examine the effect of individualism-collectivistic cultures on pro-environmental tendency among Jakarta's slum area resident. We classified cultural style into four different types; Horizontal Individualism (HI), Vertical Individualism (VI), Horizontal Collectivism (HC), and Vertical Collectivism (VC). While pro-environmental behavior was divided into two broad tendencies (positive and negative). Non-probability sampling technique with a purposive sampling approach was subjected to data collection. 196 Jakarta's residents were voluntary participated in this study. The study finding indicates that there were differences in pro-environmental tendencies based on cultural style variation.
Socio-Economic Strategy of Sustainability and Post-Mining Land Use in South Sumatra
Authors: Lestari Rizkia Ayu , Karuniasa Mahawan , Soesilo Tri Edhi Budhi , Saria Lana
Published: November 2018

This open-pit mining activity has a very helpful environmental potential, soil chemistry, erosion and sedimentation. Change in land use from mining actively after mining requires land and energy closure to ensure that the land is safe for and returned. In accordance with the local spatial pattern in Muara Enim, South Sumatra, the transfer of post-mining land after the dismissal of mining operations will be used as a conservation area managed by the mining community. The concept is an environmental addressing plan to determine the sustainability of various aspects of community life, including local sustainability, food environment, awareness, biodiversity, and sustainability. This study aims to ensure community sustainability after mining operations. The methodology that is an interview with Experts. The results of this research indicate that community empowerment in mining area can use one of the community's natural resource management strategies to ensure social sustainability with land use as agroforestry and integrated agricultural industries.
Legal Aspects of PT. Gojek Indonesia in the Partnership Agreement Dealing with the Public Transport Standards
Authors: Suhartoyo Suhartoyo , Sonhaji Sonhaji , Azhar Muhamad , Suharso Putut
Published: November 2018

This study aims to explain the accountability of PT. Gojek Indonesia through a partnership agreement with Driver Gojek Online, in order to fulfill transportation usage standards. The research method used in this study is legal research that uses an empirical approach, using quantitative data. The results show that PT. Gojek Indonesia can be held accountable and liable related to legal relations through a partnership agreement with online Gojek drivers. Accountability and accountability are based on the legal relationship between the two parties in order to share responsiveness if there is a risk of accidents or damage to the environment caused by online ojek activities. The share responsiveness has a positive impact on maintaining vehicle facilitation indirectly, through maintenance of motorized vehicles on a regular basis and through the replacement of vehicles when the vehicle has exceeded the age of 10 years borne by PT. Gojek Indonesia Driver.
Developing Payment for Ecosystem Services Scheme on Pari Island Kepulauan Seribu
Authors: Hidayati Nurul , Karuniasa Mahawan , Patria Mufti Petala , Suparmoko M.
Published: November 2018

Pari Island is a tourism area and the number of tourists has increased each year. It decreases the quality of the coastal ecosystem. However, major funding is required to maintain the quality. This study using literature review explains the value of ecosystem services and the PES scheme. The total willingness to pay, that explains the value of ecosystem services, is higher than operational budget. It indicates PES scheme can be used as an alternative way to cover operational cost. The PES scheme that can be implemented on Pari Island is between local forum as ecosystem services provider and tourists of Pari Island as user. This research contributes to the development of PES to protect the coastal ecosystem of Pari Island. This study also informs the importance of beach for Pari Island and the great negative economic impact if the beach is damage.
The Local Wisdom of Tunggu Tubang Culture in the Challenges of the Times (Study on Ethnical Semende District Muara Enim South Sumatera)
Authors: Murdiati Eni , Sriati  , Alfitri  , Muhammad  , Taqwa Ridhah
Published: November 2018

This study discusses the local wisdom of TungguTubang culture that is still embraced by the Semende ethnic community in MuaraEnim district. This study uses a qualitative descriptive approach with more emphasis on TungguTubang study facing the challenges in the era of globalization and modernization. The uniqueness local wisdom of TungguTubang culture which initially harmony with the surrounding natural environment, finally experienced a drastic change. The result of the research shows that the high- value award given by a TungguTubang to Semende society is not the expected reward anymore, because of the internal and external change factor of the social causes a change in the meaning and value of TungguTubangitself.
Building an Integrated Mining Licensing System in Order to Preserve the Environment in Indonesia
Authors: Azhar Muhamad , Suharso Putut , Ispriyarso Budi , Purnomo Agus , Suhartoyo Suhartoyo , Sukirno Sukirno
Published: November 2018

The consideration of economic interests (economic approach) has led to various problems in building a licensing system. In addition to economic sentiment, there are also sectoral ego of technical institutions and inconsistencies of various mining laws and regulations in the context of environmental preservation. The research aims to find solutions for the development of integrated licensing in the field of mining in order to maintain the sustainable environment in Indonesia. This research method of writing is a legal research. The research used statutory approach approach, comparative approach. After that, the study was analyzed using cystensis analysis. The results of the research indicate that building an integrated mining licensing system in the framework of environmental maintenance can be done through the synchronization of legislation related to mining licensing. Singronization focuses on mining which has a direct relationship with sustainable environmental maintenance and an integrated licensing institutional model in the sustainable mining field.
Optimisation of Phenol Removal from Palm Oil Mill Effluent (POME) Using Natural Bentonite
Authors: Said Muhammad , Taher Tarmizi , Rachmat Addy , Hariani Poedji Loekitowati , Lesbani Aldes
Published: November 2018

The adsorption of POME using natural clay. Bentonite has been investigated. The Optimization of phenol removal in various influence factors has been determined. The optimum conditions for dosage of adsorbent. contact time and pH are. respectively. The % removal reaches more than 85% for all parameter. The experimental data was optimized by response surface method using a second order polynomial model with Box Behken design. The optimum of parameter removal will be achieved when the dosage of adsorbent. concentration of POME and pH were 2.20 mg/L. 70.68 min and 8.07. respectively. The predicted of COD value was 0.00303 mg/L which in good agreed with experiment value as 0.0297 mg/L was obtained.
Bioethanol Production from Microalgae Oscillatoria sp Cultured in Blue Green 11 and Bold Basal Media
Authors: Hermansyah  , Sakinah Rona Ayu , Julinar  , Hanafiah Zazili , Zulkifli Hilda
Published: November 2018

The third generation of bioethanol production, bioethanol converted from biomass of microalgae. Our reserach aimed to produce bioethanol from substrate microalgae Oscillatoria sp. as substrate has been conducted. Oscillatoria sp. cultured in two media namely Bold Basal and Blue Green 11. microalgae Oscillatoria sp. were cultivated in Bold Basal and Blue Green 11 media hydrolyzed substrate, 0.143 mL/g and 0.496 mL/g, respectively. Unhyrolysate microalgae generated 0.018 mL/g and 3.59 mL/g of reduced sugar, respectively. Biomass obtained from Blue Green 11 media and Bold Basal media were 0.676 g and 0.482 g, respectively. Based on HPLC analysis, Oscillatoria sp. biomass contained maltose. Biomass were hydrolyzed by autoclaving in 121°C for 15 minutes. Bioethanol production was conducted by fermentation process using Saccharomyces cerevisiae as a microbial agent which applied in hydrolysate and non-hydrolysate of microalgae. Ethanol generated from fermentation was analyzed using gas chromatography. Based on gass chromatography data resulted that hydrolysate of microalgae biomass cultivated in Bold Basal medium and in Blue Green 11 medium produced 7% and 23% ethanol, respectively.
Identification of Mosquito Larva in Water Containers in Line with the Knowledge, Attitude and Practice of Cleaning Service in Relation to Mosquito Breeding at Pascasarjana Unsri
Authors: Ghiffari Ahmad , Aprilita Mukhlasinia , Anwar Chairil , Kasim Bahrun Indawan
Published: November 2018

Mosquitoes are vectors of several diseases for humans. To eradicate mosquitoes, information regarding breeding place of mosquito larva along with the knowledge and role of cleaning service are required. This study was aimed to identify water container as breeding sites for mosquitoes and as well as to discover knowledge, attitude and practice of cleaning service in relation to mosquitoes eradication at Pascasarjana Unsri. This study used a qualitative descriptive approach. The samples were all mosquito larva taken from the water containers. The Informants were taken with quota sampling and the information was obtained by in-depth interviews. Of the 108 containers, 30 (27.78%) indoor containers entirely contain clear water and meanwhile in 78 (72.22%) outdoor containers, 13 containers contain turbid water and 65 containers contain clear water. There were 431 mosquito larva found in five indoor containers (60 larva) and 26 outdoor containers (431 larva). Larva Free Rate (LFR) was 83.33%, House Index (HI) 16.67%, Container Index (CI) 28.70%, and the Breteau Index (BI) 41.67%. The species of mosquitoes found wereAedes aegypti, Aedes albopictusandCulex. Cleaning services have a good knowledge and attitude about mosquito breeding and practice in eradicating mosquitoes according their responsibility as cleaning service.
Rapid Assessment of Water Quality in Teluk Lake by Using Macroinvertebrates (A Family Level Biotic Index)
Authors: Kaban Siswanta , Armanto M. Edi , Ridho M. Rasyid , Hariani Poedji L.
Published: November 2018

In this study the water quality of Teluk Lake, Jambi Province by biological indices using macroobenthic during December 2017 to March 2018 were evaluated. Macro obenthic have been the most commonly indicator of running water quality to rapidly detect water quality changes. The methodology consisted on three stages: 1) macro invertebrates sampling and and sorting of the organisms in laboratory, 2) taxonomic identification of organisms and 3) determination and scoring with the Biological Monitoring Working Party -Average Score per Taxon (BMWP-ASPT) index. Result of water quality of Teluk Lake based on the diversity of macroinvertebrates was degraded with BMWP-ASPT index below 4. Based on the BMWP-ASPT score of the macroinvertebrates, both of sampling 1 and 2 were polluted with the category of medium and heavily polluted. In general, the decreasing of water quality of Teluk Lake was due to anthropogenic activities, so that the intolerant macro invertebrates could not survive in polluted waters while the tolerant ones can adapt well to the polluted aquatic environment.
Utilization of Golden Apple Snail (Pomacea canaliculata) Shells as Liming Materials for Pangasius sp Culture in Swamp Fish Pond
Authors: Jubaedah Dade , Wijayanti Marini , Marsi  , Rizaldy Nazario
Published: November 2018

Liming ponds is intended to increase swamp soil and water fish ponds pH. The golden apple snail (Pomacea canalicuata) is one kinds of agriculture pest which is potentially used as material of lime. The golden apple snail shells containing CaO (91.62%) and MgO (1.66%). This study aims to determine the best dosage of lime derived from golden apple snail shells to increase the pH of soil and water, as well as the survival and growth rate of catfish fingerlings. This study used Completely Randomized Design (CRD) with 5 treatments (4 treatments of different dosage of lime derived from golden apple snails and 1 treatment using calcite and 3 replications. The treatments used consisted of different dosages of lime : P1) 4 ton/ha; P2) 5 ton/ha; P3) 6 ton/ha; P4) 7 ton/ha and P5) calcite 6 ton/ha equivalent to CaO. The result showed that maximal pH value of P4 (lime derived from P. canaliculata 7 ton/ha) is almost same as pH of P5 (calcite 6 ton/ha) but P4 is faster to reach than that of P5. At the final day of research P4 has no significant different with calcite 6 ton/ha (P5) for alkalinity, fish growth and feed efficiency.
Biosorption Processof Synthetic Textile Waste-water using Bjerkandera Agustavia Response Surface Methodology (RSM)
Authors: Astuti Ariani Dwi , Muda Khalida
Published: November 2018

Textile industry generates large quantities of wastewater. Discharging effluent of textile industry without treatment is led to the degradation of the quality of receiving water bodies.A high color, high BOD/COD and salt (Total Dissolved Solids, TDS) load are founded in the textile wastewater. Several alternative of methods,including physico-chemical methods such as filtration, carbon activated, coagulation and chemical flocculation have been used to treat textile industry wastewater. Although these methods are effective, but they are expensive and result concentrated sludge that creates a secondary disposal problem. The passive uptake of organic and inorganic species including metals and dyes from aqueous solutions by the use of non-growing/living microbial mass or their derivatives is namely biosorption.The effects of pH, weight of biosorbent, contact time and size of biosorbent in biosorption process using Bjerkandera adusta in synthetic textile wastewater were investigated and optimized using response surface methodology (RSM). The optimum removal conditions were determined at pH 4, contact time 90 minutes, weight of biosorbent 3000 mg/L, and size of biosorbent 0.4 mm. Color removal of 53.55% was demonstrated, the experimental data and model predictions agreed well. In the optimization, R2 and 2correlation coefficients for the quadratic model was estimated quite satisfactorily as 0.988 and 0.977, respectively.
Risk Analysis Income of Fish Business at Ranau Lake of South Sumatera Indonesia
Authors: Permatasari Fifian , Munajat
Published: November 2018

This study aimed to analyse the risk income of fish business in Ranau Lake of South Sumatera Indonesia. The location is determined by purposive on the banks of Ranau Lake, South OKU, South Sumatera Province, Indonesia. The method of this research is case study method, and simple random sampling as the sample method, with take 62 samples of 81 total population. The result showed that the income from this business is Rp 148.459.460 a year. Risk analysis showed that this business will not face risk significantly, which is indicated by the coefficient of variation of 0.0892004791 with a lower limit value of the income is Rp 121.974.150.081.
Rule-Based Technique for Monitoring of Voltage Events in Power Systems
Authors: Chen Cheng-I , Chen Yeong-Chin , Chen Chung-Hsien
Published: November 2018

For the development of smart grid, the effective detection of voltage events is a very important task for the power system monitoring. Voltage sags, interruptions, and voltage swells which usually produce large losses in commercial and industrial consumers are the main events in power systems due to the sensitivity of equipments to these voltage variations. In this paper, a hybrid detection method for voltage events by combining the wavelet analysis and adaptive linear combiner (ADALINE) is proposed. The usefulness of the proposed algorithm is demonstrated by a simple laboratory setup with LabVIEW program and actual recorded waveforms. With the help of accurate time locating of the wavelet analysis and correct event classification of ADALINE, power system monitoring could provide accurate and useful information to power grids via the developing advanced metering infrastructure.
Solar Power Prediction via Support Vector Machine and Random Forest
Authors: Yen Chih-Feng , Hsieh He-Yen , Su Kuan-Wu , Yu Min-Chieh , Leu Jenq-Shiou
Published: November 2018

Due to the variability and instability of photovoltaic (PV) output, the accurate prediction of PV output power plays a major role in energy market for PV operators to optimize their profits in energy market. In order to predict PV output, environmental parameters such as temperature, humidity, rainfall and win speed are gathered as indicators and different machine learning models are built for each solar panel inverters. In this paper, we propose two different kinds of solar prediction schemes for one-hour ahead forecasting of solar output using Support Vector Machine (SVM) and Random Forest (RF).
Intelligent Wind Power Smoothing Control using Fuzzy Neural Network
Authors: Lin Faa-Jeng , Chen Shih-Gang , Chang Jin-Kuan
Published: November 2018

An intelligent wind power smoothing control using fuzzy neural network (FNN) is proposed in this study. First, the modeling of wind power generator and the designed battery energy storage system (BESS) are introduced. The BESS is consisted of a bidirectional interleaved DC/DC converter and a 3-arm 3-level inverter. Then, the network structure of the FNN and its online learning algorithms are described in detail. Moreover, actual wind data is adopted as the input to the designed wind power generator model. Furthermore, the three-phase output currents of the wind power generator are converted to dq-axis current components. The resulted q-axis current is the input of the FNN power smoothing control and the output is a gentle wind power curve to achieve the effect of wind power smoothing. The difference of the actual wind power and smoothed power is supplied by the BESS. Comparing to the other smoothing methods, a minimum energy capacity of the BESS with a small fluctuation of the grid power can be achieved by the FNN power smoothing control. In the experimentation, a digital signal processor (DSP) based BESS is built using two TMS320F28335. From the experimental results of various wind variation sceneries, the effectiveness of the proposed intelligent wind power smoothing control is verified.
Multi-Function High-Power Converters for Smart-Grid Applications
Authors: Wu Tsai-Fu , Huang Yen-Hsiang , Lin Ting-Hung
Published: November 2018

High penetration of green energy has driven conventional utility grids into smart grids to accommodate dc appliances and various types of dc equipment, increasing effectiveness, efficiency, and resilience. In a smart grid, ac is harmonized with dc, and therefore, a multi-function converter is required to transfer power between ac and dc grids. This paper presents system configuration, operational principle and control of multi-function high-power converters for smart-grid applications. Simulated and experimental results from a 350 kVA converter are used to verify the feasibility of the proposed system configuration and control.
Optimization of surface reflectance for silicon solar cells
Authors: Ayvazyan Gagik , Barseghyan Razmik , Minasyan Sergey
Published: November 2018

A study on the formation of black silicon (b-Si) antireflection layers on crystalline Si wafers using SF6/O2gas mixture in a reactive ion etching method is presented. The process is low-temperature, fast and does not depend on the crystallographic orientation of the Si wafer. The b-Si layers have demonstrated average reflectance values of 4% and 5% for monoand polycrystalline Si wafers respectively, feature that is suitable for the fabrication of high efficiency solar cells. Passivation of b-Si antireflection layers by suitable different thin films can significantly reduce needle-like surface recombination losses.
A Net-Zero Energy System Solution for Russian Rural Communities
Authors: Lombardi Pio , Arendarski Bartlomiej , Suslov Konstantin , Shamarova Natalia , Sokolnikova Polina , Pantaleo Antonio Marco , Komarnicki Przemyslaw
Published: November 2018

The COP 21 agreement state that the reduction of CO2 emissions will limit the rise of global temperatures and thus the impacts of global warming. Since the energy sector is one of the biggest CO2 emitters, greening it is one of the actions selected to achieve COP 21 targets. Increased generation from renewable sources, however, should entail an increase of flexibility options for integrating renewable energy in the system. The volatility of renewable sources such as wind and sun requires flexible storage units, energy conversion and management techniques as well as active consumer participation to ensure the power system is balanced. In multi-energy systems, the electricity generated by renewables is converted into other energy forms such heat or gas. Rural areas result to be attractive test bench in which multi-energy system could be developed. The objective of this study is to analyze the potential for the development of multi-energy systems in remote Russian communities.
Modern problems of energy security of the Caspian regions of Russia and Azerbaijan
Authors: Senderov S.M. , Yusifbeyli N.A. , Rabchuk V.I. , Huseynov A.M. , Nasibov V.Kh. , Guliyev G.B. , Vorobev S.V. , Smirnova E.M.
Published: November 2018

The article is devoted to the analysis of the problems of ensuring the energy security of the Caspian regions of Russia and the Republic of Azerbaijan. The priority problems of energy security analysis were raised at the regional level and at the level of countries as a whole. It describes the main indicators of energy security, the monitoring of which is relevant for both countries. The article analyses the main factors changing the situation in both countries in the medium term and draws conclusions on the direction of the main actions so that the situation changes for the better.
Mathematical modeling of mini-CHP based on biomass
Authors: Mednikov Aleksandr , Maksimov Alexey , Tyurina Elina
Published: November 2018

One of the promising directions of small-scale distributed power generation for Russia is the use of biomass. The present work is devoted to studies of an mini-CHP based on multi-stage biomass gasification. Mathematical models of elements and mini-CHP in general based on technological schemes were constructed. The mathematical models were constructed with the software developed at Melentiev Energy Systems Institute of Siberian Branch of the Russian Academy of Sciences. The calculations were made for two sizes of internal combustion engines. Thus, we obtained the values of flow rates, temperatures of heat carriers at various points of flow charts of the plants.
Competitiveness Of Advanced Technologies For Production Of Electricity And Alternative Liquid Fuels
Authors: Tyurina Elina , Mednikov Aleksandr , Sushko Svetlana
Published: November 2018

Technical and economic aspects of synthetic liquid fuel and electric power combined production within one energy-technology installation (ETI) are considered. The range of prices for alternative liquid fuel (ALF) produced by the installations, depending on the cost of consumed fuel, price of supplied electric power and level of capital investments, has been ascertained. The studies made suggest the conclusion that combined production of dimethyl ether is more efficient from the energy and economic viewpoints than methanol production. Besides, a certain level of oil prices was identified, its excess implying that production of ALF, i.e. dimethyl ether, will be more economically efficient than production of motor fuel from oil.
Intelligent support tools for strategic decision-making on Smart Grid development
Authors: Massel Liudmila , Massel Aleksey
Published: November 2018

The article discusses the concepts of Smart Grid and the digital power industry being developed in Russia. The main information technologies offered for their implementation are analyzed. It is proposed to include in this list intelligent technologies to support strategic energy development decisions,. Three generations of such tools developed in a team headed by the authors are considered. The proposed Intellectual tools are based on the concepts of situational management and semantic modeling. It is noted that the third version seems to be the most perspective. Examples of semantic models and schemes of the proposed intelligent tools are given.
Currents in the overhead transmission line lighting wire in case of single-phase short circuit
Authors: Zimin Kirill , Rubtsova Nina , Ryabchenko Vladimir , Tokarskskiy Andrey
Published: November 2018

The algorithms for currents induced in a grounded lightning wire (LW) with single-phase short circuit (SC) calculation are considered. It is shown that the method of short-circuit current and current in LW simultaneous determination gives more correct results for the assessment of LW thermal resistance
Smart meters as a key component of modern measuring infrastructure providing observability and state estimation of low-voltage distribution networks
Authors: Kuzkina Yana , Golub Irina
Published: November 2018

The paper presents a solution to the problem of organization of a system for collecting and transmitting information about measurements from smart meters necessary for the state estimation of a low-voltage distribution network. The problems of providing the sufficiency of measurements for the observability of the network and the influence of errors in the information about load connection to phases on the quality of the observability are considered. The results of allocation of smart meters and the state estimation of the real distribution network are given.
Influence of failures of overhead lines on reliability of autonomous power supply system
Authors: Karamov Dmitriy , Perzhabinsky Sergey
Published: November 2018

We research influence of failures of overhead lines on reliability of autonomous power supply system with distributed generation in the given article. Simulation of failures of overhead lines are done on the base of long-term data of exploitation distributing electricity networks. Considered autonomous power supply system consists of wind and solar power stations. Diesel generators are emergency sources of electricity in the system. For adequacy estimation of electricity supply we many times simulated and analyzed of random states of autonomous power supply system. Results of experimental research confirm that detailed accounting of statistics of real failures of overhead lines increases of quality of reliability analysis.
System of technical vision based on active laser triangulation method
Authors: Panov Kirill , Borodin Anatoly
Published: November 2018

The number of failures, the percentage of faulty electric locomotives, and the number of unplanned repairs remain high at the enterprises for repair of traction rolling stock of the network of the main-line Russian railways. It was found that the main reasons for this situation are the unsatisfactory quality of current repairs and maintenance, the insufficient level of mechanization and automation of labor-intensive repair processes. The paper considers an existing positive example of the use of robotic equipment in assembly production for the repair of traction rolling stock. The analysis and classification of sensor control devices for industrial robots is performed. A method for controlling the driving devices of the repair equipment is proposed by obtaining a spatial-geometric image of the object’s surface before the beginning of technological processing by the method of active laser triangulation scanning. The principle of the action of three-dimensional scanning is described; a number of equipment with its technical characteristics and software used during the research in the laboratory of the university is listed. The result of the experiment of the proposed method on the model of the truck frame of the electric locomotive is presented. The metrological characteristics of the measurement results are calculated, allowing comparing and assessing the accuracy of the model obtained and the mock-up of the rolling stock truck. Based on the results of these calculations, it can be said with certainty that all errors and deviations of the results from true values lie within the limits of the norm and this technology can be used to design a vision system for robotic equipment.
Fuzzy logic principles for an induction motor direct torque control application
Authors: Olkhovatov Dmitry , Noskov Vladimir , Ripol-Saragosi Tatiana
Published: November 2018

In the article three induction engine torque direct control system designing methods are compared: classical; width-pulse voltage modulation is set according to the output of "Switching table" block; based on fuzzy logic mathematical apparatus. The direct torque control systems structure and particular blocks included in are considered. Numerical methods in order to determine the harmonic composition of such values as the electromagnetic torque, the stator coil voltage and current at low rotor rotation speeds are described. The obtained results analysis is given.
The improvement of composite plates’ indicators from cotton and flax spinning waste by modification of raw materials
Authors: Ibragimov Alexander , Vakhnina Tatyana , Susoeva Irina
Published: November 2018

The article is devoted to solve the problem of modification of the non-returnable cotton and flax spinning waste in order to improve the physical and mechanical characteristics of composite heat-insulating plates based on these wastes. The modification of the vegetable filler with a 1% solution of sulfuric acid made it possible to increase the physical and mechanical indicators of plates. The thermal insulation properties of the composite plate material with some soft acid modification of the filler did not change significantly.
An evaluation method of reliability indicators of automobile textile materials
Authors: Lisienkova Liubov
Published: November 2018

The aim of the study was to develop a method for predicting the reliability indicators of automobile textile materials. The characteristics of material deformation under conditions of cyclic compression have been studied, the parameters and test modes have been determined. The design and construct of a device for cyclic compression have been shown as well as a method for evaluation of deformation indicators of materials. The results of experimental tests of material samples have been described. As a result, a full-fledged methodology for estimating reliability indicators has been developed. As an evaluation criterion, the change in the deformation of materials during cyclic compression has been selected. The method of cyclic compression has been justified to allow predicting the behaviour of materials in the production and product exploitation.
Expanding the functionality of automated monitoring systems for traction substations
Authors: Makasheva Svetlana , Pinchukov Pavel
Published: November 2018

The paper deals with the problem of automated monitoring system improvement. The goal of the study is to create a controlling module of automated monitoring system for automation of calculations and assessment process of traction transformer's remaining life analysis. To achieve the goal, the modern power transformer’s diagnostic systems and methods of scientific analysis are considered, full-scaled experimental study are used. To adjust the timing of the current and major repairs, it is proposed to improve this monitoring system by creating an additional module to determine the traction transformer’s remaining life throughout its life cycle in real time and the formation of a warning system. Requirements to transformer’s remaining life assess module are formulated. Calculation algorithm and program module for identifying the transformer’s remaining life parameters are described. Benefits of introduction into the existing AMS a new additional module for calculating the transformer’s remaining life are shown.
Assessment of the technical condition of deep mine shafts
Authors: Pleshko Mikhail , Kulikova Elena , Nasonov Andrey
Published: November 2018

In the present research, the estimation of actual durability of a shaft lining is made, considering the influence of factor of water filtration through “cold” seams of lining. This study is carried out on two vertical shafts of Donbas mines on eight sample plots. The data on the actual strength of the concrete lining after excavation and after 10 years of operation of the shaft were compared. The analysis of the data showed that the zone of “cold” seams is characterized by a decrease in the strength of concrete lining and an increase in the coefficient of variation of strength. It is established that the exhaustion of the resource of the shaft lining in the zone of leaking “cold” seams will occur in 16,9 years after the start of operation of the shaft, which is 4,6 years earlier than in the central areas of the lining stope.
Influence of transverse loading on the stability of a clamped rectangular plate
Authors: Sukhoterin Mikhail , Baryshnikov Sergey , Knysh Tatiana , Pizhurina Natalia
Published: November 2018

Shapes of a square Kirchhoff plate with a clamped edge are obtained and analyzed, before and after losing stability in the case of a compound bending (uniform transverse loading in combination with edge compressive loading), as well as equilibrium forms and critical loadings only with clamping in the plate’s surface. Hyperbolic trigonometric series are used for solving. It was established that transverse loading causing small deformations does not affect the plate’s stability. The range of the critical state corresponds with an unlimited increase in bends of interior points of a plate. As critical loading, we suggest taking the one at which the bends at the plate’s center tend to infinity the most rapidly. As balanced loading, we suggest taking the one at which the plate acquires a new stable equilibrium form. A range of critical and balanced loadings of a square plate with a clamped edge was presented. The corresponding 3D forms of supercritical equilibrium of the given plate were obtained. A comparison with the results of other authors is given.
Algorithm of the target function of time between overhauls taking into account gradual and sudden failure of the locomotive equipment
Authors: Osyaev Anatolii , Rauba Alexandr , Kosarev Alexandr
Published: November 2018

The paper considers the principles of technology of scheduled preventive repair of equipment, as well as the principles of repair taking into account the technical condition of locomotive equipment. The main goal of the study is to justify the mechanism for optimizing the repair cycle of locomotives in order to ensure high reliability of the equipment at the lowest costs. For the organization of the strategy of maintenance and repair of the locomotive fleet according to the scheduled preventive repair method and the method taking into account the technical condition, an algorithm for the target function of the time between overhauls has been developed, taking into account the gradual and sudden failures of the locomotive equipment. A description of the model of gradual failures and the target function including the values of mileage and tolerance is given. The results of the study formulated a more universal algorithm of the target function for determining the values of the standard operating time of the assembly unit subjected to both gradual and sudden failures in operation, which includes an analysis of the errors of the first and second kind in diagnosing the object, the probability of replacement and failure detection, and economic indicators.This algorithm is adapted to the repair cycle consisting of three types of repair: the current repair CR, the medium repair MR, and the overall repair OR. It has been established that when optimizing the repair cycle of locomotives while simultaneously taking into account both gradual and sudden equipment failures, a reduction in the number of unscheduled repairs reaches 10-15%, the number of scheduled repairs is reduced by 12-18%.