bluuebunny/crossref_metadata_2025_split huggingface dataset:
Flow and efficiency measurements with clamp-on ultrasonic equipment
Authors: Dhital T C , Nielsen T K 
Published: August 2019

Abstract
There are several efficiency measurement methods to determine the performance of hydraulic turbines under various circumstances in hydropower plants. To do this, most of the measurement methods require precise determination of discharge. Any hydropower plant with complex pipe geometry and short water inlet near discharge measurement section complicates the use of traditional measuring techniques. Clamp-on ultrasonic flowmeter (USM) can be a good alternative in this situation as it is easy to install at very low cost compared to most of the volumetric flowmeters. Clamp-on USM can be used as index testing method that provides relative values of hydraulic efficiency by measuring the discharge.
In this study, discharge measurements with a clamp-on USM were performed at three different positions away from a valve which was partially opened. The main objective was to study the repeatability of the measurements in each position.
Investigation of fluid transients in a penstock attached to a Francis turbine rig using seismic interferometry
Authors: Farstad Perkunder Magnus , Nielsen Torbjørn K. , Faudot Celine 
Published: August 2019

Abstract
Pressure fluctuations in hydropower plants contribute to fatigue loads. Pressure pulsations generated by a reaction turbine will create fluid transients in the attached system which can increase the load on structural parts if resonance occurs. Several factors govern transients in a pipe system where the main parameters are the length between reflection points and the propagation velocity. This paper investigates how to find the propagation velocity of pressure waves measured in the penstock at the Hydropower Laboratory at NTNU by applying techniques from seismic interferometry. A simple 1-D model has been developed using the method of characteristics to compare the experimental results to a known system. Seismic interferometry is primarily used in academic and research settings, the basic principle is to obtain the Green’s function between measured signals. The results from the experimental data and simulations are promising, but further research is needed to optimize both data acquisition and post processing.
Modeling of the separation for system the liquid - solid in the battery of hydrocyclones
Authors: Lamskova M , Filimonov M , Novikov A , Samofalova L , Pavlova S 
Published: August 2019

Abstract
The mathematical model of the process of separation for the liquid – solid system in the hydrocyclone battery is considered, at that the devices are equipped with replaceable pairs of inserts for varying the diameters of the inlet and outlet pipes. It is established that when assessing the overall degree of purification of the suspension in the hydrocyclone battery with the same diameter of the corpuses and replaceable diameters of the pipes, it is necessary to take into account not only the separation factor, but also the average residence time of the liquid in the separation zone. In this connection, it is proposed the parameter P, equal to the product of these indicators. In this interpretation, increase the total degree of purification of the suspension concomitantly with increase the number of hydrocyclones in the battery is consistent with the corresponding value of the parameter R.
Jamming of hand-operated riveter – the problem and solving it in process of modelling
Authors: Zaitsev V , Konovalov V , Rodionov Yu 
Published: August 2019

Abstract
During the exploitation of hand rivet tools, abnormal situations arise due to the jamming of the used mandrel (core) in the actuating mechanism, leading to an increase in process time. The main purpose of the article is establish of hand rivet tools teeth parameters to eliminate self-braking of the used mandrel (core) in the actuating mechanism. Parameters of the rivet tools teeth are determined by force analysis. The limit equilibrium conditions by the modeling process of rivet tool exploitation were obtained. The strength conditions are determined by force dependencies. The condition of self-braking of the used mandrel (core) in the hand rivet tool jaws is determined. As a result of numerical simulation, the recommended values of the angles of inclination of the teeth front surface of the rivet tool jaw, which are eliminate jamming of used mandrel (core) in the actuating mechanism, are obtained. The recommended values of the angles of inclination of the teeth front surface of the rivet tool jaw should not be less than 32 degrees.
Modeling of adsorption process in continuous counter current column having diffused flow structure in gaseous phase
Authors: Golovanchikov A B , Merentsov N A , Topilin M V 
Published: August 2019

Abstract
The authors have studied the physical and mathematical models of the continuous adsorbing apparatus having diffused flow structure in gaseous phase and ideal displacement in dispersed solid phase of the adsorbent. There have been obtained equations of the operating line and profiles of concentrations of redistributed component in gas and adsorbent particles in its layer height. The authors offer a calculation algorithm and have compared the main technological and geometrical parameters of the studied process with typical adsorption having ideal displacement flow structures in both phases.
Intelligent user interface design of application programs
Authors: Zubkova T , Tagirova L 
Published: August 2019

Abstract
The modern software is used in all areas of human activity. Application programs allows users to carry out the professional activity at the new, better level. The most important component of any application is the interface on which not only specialist productivity depends, but also quality of the performed work. As the contingent of modern users is very different, it is reasonable to develop the software and its interface part taking into account features of target audience. Use of elements of artificial intelligence at design of application programs will allow to consider features of training of users as much as possible. Creation of adaptive interfaces is caused by high growth rates of functionality of modern program systems, need of simplification of their operation and also to reduction of requirements to the professional level of users. In article the technique of development of the adaptive interface on the basis of individual characteristics of users and also their emotional status is described. Users were divided into five groups: the beginner, normal, confident, qualified and the administrator. Key parameters of individual users characteristics and also their possible emotional states are revealed. The automated system which can create groups based on the analysis of characteristics of users and their emotional state is developed, each group is provided by the adapted prototype of the interface of the application program.
Optimization of the work of the blank production of a machine-building enterprise with the use of simulation
Authors: Podvalny S L , Chizhov M I , Gusev P Y , Gusev K Y 
Published: August 2019

Abstract
The use of information technology in machine-building enterprises has become an integral part of the entire production process. An analysis of the literature has shown that the topic of optimization of blank production using modern information technologies has not been sufficiently disclosed. In this paper, it is proposed to use simulation modelling to optimize the work of blank production. The use of a genetic algorithm is proposed as an optimization algorithm. Practical testing of the proposed solution showed a good result.
Estimated transport of Equatorial Undercurrent observed at 90°E during the Indonesia Prima 2017 campaign
Authors: Siswanto  , Kusmanto E , McPhaden Michael J 
Published: August 2019

Abstract
Equatorial Undercurrent (EUC) plays an important role in the dynamic of the eastern Indian Ocean. EUC supplies water masses with high salinity into Indonesian waters. This article examines the EUC transport volume at 90°E across 2°S - 2°N observed on 1st – 3rd March 2017 during the Initiative on Maritime Observation and Analysis Expedition (Indonesian Prima 2017). The analysis of temperature and salinity obtained from conductivity, temperature and depth (CTD) instruments at five stations (CTD11 - CTD14) and current profiles of Shipboard Acoustic Doppler Current Profiles (SADCP) indicate the presence of high speed water column flowing the Arabian Sea High Salinity Water (ASHSW) as characterised by maximum salinity (35.15 - 35.2 PSU) in the temperature range of 18°C - 23°C. ASHSW carried by EUC from the western Indian Ocean at the upper thermocline layer had a tendency to be asymmetrically stronger to the north of the equator. The analysis shows a maximum EUC current speed of 94 cm/sec. Estimated EUC transport water masses based on the curvature area of salinity contour 35.15 and 35.2 PSU respectively result a ∼3.4 Sv and a ∼1.4 Sv, while at curvature area of salinity 35.00 - 35.10 PSU gave about ∼8.7 Sv. The total estimated EUC mass eastward transport calculated in this study is ∼13.5 Sv.
The Influence of ENSO and IOD During Mesoscale Convective Complex (MCC) to Rainfall in Indonesia
Authors: Rustiana S , Trismidianto  , Satyawardhana H 
Published: August 2019

Abstract
Climate phenomena that significantly affect Indonesian rainfall to be lower (positive) and higher (negative) than normal conditions are ENSO and IOD. The other phenomenon with different time scale with ENSO and IOD is MCC that rainfall until causing storms. This study was conducted to determine the influence of ENSO and IOD during MCC to rainfall in Indonesia. The data used are monthly data of rainfall, Nino3.4-IOD index, and hourly MCC data derived from T
bb
data of Himawari Satellite, year 2001-2015 observation. The study focused on 4 occurrence phenomena: Nino3.4 (+) IOD (+), Nino3.4 (-) IOD (-), Nino3.4 (+) IOD (-), and Nino3.4 (-) IOD (+) with the distribution of 3 longitude regions (90-105E, 106-125E, and 126-140E). The results showed that the distribution of rainfall during MCC were higher when the events of negative IOD compared to other events, especially in the western maritime of Sumatra until Kalimantan. While, in the Nusa Tenggara region there is no rainfall when positive Nino3.4 events due to positive ENSO influence from the Pacific Ocean. The MCC also give effect on interior cloud size and duration of life cycle when negative IOD events on 3 longitude regions. The effect includes the size of the interior of the cloud becomes larger and the duration of the life cycle is longer. Eccentricity interior is close to 1, means the contribution of MCC is high enough to Indonesian rainfall on negative IOD events.
Diurnal Rainfall Propagation Relate to Cold Surge-Cold Tongue Interaction over The Northern Coast of West Java
Authors: Yulihastin E , Hadi T W , Ningsih N S 
Published: August 2019

Abstract
Interaction of the diurnal cycle of rainfall systems between land and sea were investigated by hourly rainfall of 3B41RT TRMM dataset, daily SST dataset from OISST, 6- hourly wind and temperature data from NCEP-NCAR Reanalysis, during period of NDJFM 2000-2016. The results showed that the diurnal cycle of rainfall from sea to land and from land to sea randomly occurred on four combinations of CENS-CT, NCENS-CT, CENS-NCT, NCENS-NCT. Diurnal rainfall in northern coast of West Java for normal conditions without CENS-CT has two maximas, namely late afternoon and early morning rainfall. CENS-CT interaction changes the normal diurnal rainfall pattern into three diurnal rainfall systems: diurnal rainfall with propagate B pattern which is identified by the afternoon continous to morning rainfall and there is an offshore propagation from sea to land that occurred in the morning, diurnal rainfall with a nonpropagate pattern, namely morning rainfall which has increased intensity and duration while afternoon rainfall is minimum, diurnal rainfall with propagate A pattern which experienced rainfall from land to sea and there was a merger between the afternoon rainfall system over the land and the morning rainfall system over the sea.
Exploring Standardized Precipitation Index for predicting drought on rice paddies in Indonesia
Authors: Surmaini E , Susanti E , Syahputra M R , Hadi T W 
Published: August 2019

AbstractDroughts have severe consequences for rice crops in Indonesia, as these occur annually and increase during El Niño phenomena. Accordingly, paddy drought assessment is necessary for developing adaptation strategies for successful crop production. We conducted a detailed assessment of paddy drought-climate indices in Indonesia. This was done by looking at the onset and trends of the Standardized Precipitation Index (SPI) in a three-month time scale (SPI-3) and exploring their relationship with paddy drought-affected areas. The Cartesian quadrant was used to illustrate the combination of SPI-3 onset and trend on the paddy drought affected area. This gave four different drought risk levels: low, moderate, high, and very high. The hit rate (HR) as the proportion of drought occurrences were correctly hindcast and percent of correct (PC) as the total number of correct hindcast divided by the total number of hindcast was used to verify the accuracy of drought effect prediction on paddy rice. The results demonstrate that the highest accuracy of paddy drought predictions occurred in the peak of dry season in July, while the accuracy of drought and non-drought occurrences (PC) was higher in the non-peak months, April through September, excluding July.
Rainfall Scenario of West Nusa Tenggara in 2040 Based on CCAM RCP 4.5
Authors: Nurlatifah A , Sipayung S B , Siswanto B 
Published: August 2019

AbstractClimate change is one of the global issues with a broad impact to society. Because of its importance, there is a need to build a prediction system that can support mitigation, adaptation or prevention of climate change. West Nusa Tenggara (NTB) is an area where most of the population relies on agriculture for their livelihood so that the availability of rainwater becomes very important for daily survival. In this research, rainfall in NTB was predicted by CCAM (Conformal Cubic Atmospheric Model) model based on RCP (Recent Concentration Pathways) 4.5 scenario. Based on the verification results, the CCAM model was proven to perform fairly well in estimating rainfall in NTB in 2014-2016. This is evidenced by the high correlation coefficient between CCAM and observed rainfall data in several locations such as Kuripan, Kumbe, and Gunung Sari which reached 0.57, 0.51, and 0.51 respectively. In January 2040 places such as Bima, Sumbawa Besar and parts of Lombok Island are predicted to have a decrease in rainfall when compared to that in January 2018. The decrease ranges from 40-120 mm in one month. While in Kumbe and Kuripan, rainfall is predicted to increase, with an increase of about 0-40 mm in one month. In August 2040 rainfall is predicted to generally rise in NTB with an increase of up to 40 mm in one month.
Density optimization for the manufacturing of bark-based thermal insulation panels
Authors: Pásztory Z , Börcsök Z , Tsalagkas D 
Published: August 2019

AbstractBuildings in general, consume and lose huge energy amounts through their heating and cooling systems. Thus, effective thermal insulation materials required to endow on energy shaving attainments. For this research, bark particles were used as raw materials for the manufacturing of low-density thermal insulation panels. The aim of this work was to determine the optimum density value of these panels in combination with their thermal conductivity and mechanical performance. Three panel densities, i.e. 250 kg/m3, 300 kg/m3and 350 kg/m3were used in this study. For each density, specimens for the thermal, physical (water absorption, thickness swelling) and mechanical (static bending, internal bond) assays had been analysed. As proposed by the results, the optimum conditions could be achieved at density levels of 350 kg/m3. All things considered, bark-based particleboards seem to be a very promising feedstock materials for their usage especially as interior thermal insulation panels, in the building sector.
Operation of energy wood plantation with special regard to harvesting technology and timber logistics
Authors: Czupy I , Mátyás K Szakálosné , Horváth A L , Horváth B , Beszédes S , Vágvölgyi A 
Published: August 2019

Abstract
One possible solution for the production of wood for energy or industrial purposes is the planting of energy wood plantations. In this type of target plantation, a large amount of dendromass can be produced in a short time. Before the afforestation the site survey is highly important. Based on the results the tree species can be chosen and the corresponding cultivation technologies can be planned. Energy plantations are generally man-made forests with fast-growing species and the rotation period is short. Therefore it is necessary to determine the method of harvesting and the corresponding machine system already at the planning phase. After harvesting the timber should be transported in a short period of time in order not to prevent the development of the next tree stand. At the transport large amount of wood chip must be moved for shorter or longer distance. Thus the applied logistic plays very important role in the whole process, by making the operation of timber utilizing power plants as profitable as possible.
Determining the vulnerability index in the context of high floods in An Giang province
Authors: Van Can Thu , Tri Doan Quang , Son Nguyen Thanh , Thu Thao Tran Thi , Hong Hoa Do Thi 
Published: August 2019

Abstract
The vulnerability, flood hazards, and exposure are three indicators to calculating and assessing flood risk in the Mekong Delta river. Flood risk assessments allows managers to understand the probability and implications of potential damage caused by floods. The vulnerability index is based on three criteria, including sensitivity and adaptive capacity related to the economic, social, and environmental aspects and benefits that floods bring to the Mekong Delta river. The flood events occurred in the years that the flood peak at Tan Chau was over 4 m, causing the most severe damage in this area. This paper will use the vulnerability index method which is the sum of the components including the sensitivity, resilience and benefits of floods to calculate and assess the flood vulnerability of 155 communes in 11 districts of An Giang province. The results showed that there are four communes were affected by average vulnerability and 151 communes with high vulnerability.
Impact of incorporation of volcanic ash on geopolymerization of eco-friendly geopolymer composites: A review
Authors: Luhar S , Rajamane N P , Corbu O , Luhar I 
Published: August 2019

Abstract
Volcanic ash is a product from an explosive type of volcanic eruptions. Fresh particles of volcanic ash are gritty, abrasive, vexatious and corrosive with huge scale dispersion. Consequently, it is the need of the hour to dispose this waste systematically to have relief from dilemmas like land fillings; climatic changes, pollution of the environment, water, and health hazards although the soil is a mineral intake. This crucially reviewed manuscript includes not merely the comprehension of the incorporation of volcanic ash to develop novel green Geopolymer composites but also to study its impact on the geopolymerization reaction kinetics and reactivity at dissimilar temperatures along with a precise account of its chemistry, mineralogy and the morphology.
Comparative study of experimental approaches to increase the availability of phytochemicals using gamma radiation
Authors: Petre A , Vamanu E 
Published: August 2019

Abstract
In recent years, there has been significant interest in the reduction of health risks due to diseases caused by oxidative stress. Many plants contain compounds that mitigate such decay, and there are many studies that attempt to increase the availability of these phytochemicals using gamma radiation. This paper reviews 14 such studies, in attempt to shed light on the overarching elements of the employed experimental designs. Most studies of gamma irradiated plants evaluated the total phenolic and flavonoid content, as well as the antioxidant capacity of plant extracts, while only a few evaluated the antimicrobial activity and the vitamin or mineral content. The assays used to quantify this data were rather similar however, the dosimetry and extraction methods varied greatly, according to the plant which was being studied. Among the reviewed papers, only a few found that the irradiation of plant material decreased or had no effect on the assayed parameters. The majority of studies showed significant increases, at various doses, among the assayed data.
Corrosion behavior of Ni/WC nano-structured composite layers synthesized by electrochemical method
Authors: Benea L , Simionescu N 
Published: August 2019

Abstract
Ni/WC nano-structured composite coatings were developed by electrodeposition method from a nickel plating electrolyte containing WC nanoparticles (diameter size of ~60 nm). The corrosion behavior of Ni/WC nano-structured composite coatings and pure Ni coating were comparatively investigated in wet conditions in the solution that simulates the primary water of Pressurized Water Reactors (PWRs). The morphology and chemical composition of the obtained coatings before was observed through scanning electron microscopy (SEM) connected to an energy dispersive X-ray system (EDX). The open circuit potential (OCP) and Electrochemical Impedance Spectroscopy (EIS) methods were used to evaluate the corrosion behavior, at room temperature. The nanohardness of pure Ni and Ni/WC nanocomposite coatings was tested by nanoindentation technique. SEM-EDX analyze proved that WC nanoparticles were successfully incorporated into Ni matrix. Presence of WC nanoparticles in the nickel matrix transforms surface morphology from regular pyramidal to irregular global and changes the crystallizations of nickel matrix to smaller and thinner crystallites. Ni/WC nanocomposite coating revealed a higher nanohardness value in comparison with pure Ni coating. The corrosion resistance of Ni/WC nanocomposite coating is higher under similar experimental conditions as compared with pure nickel layers, proving an enhancement of corrosion resistance.
Influence of different concentration of hydrogen peroxide on the corrosion behavior of Ti-6Al-4V alloy immersed in physiological solution
Authors: Ravoiu A , Simionescu N , Benea L 
Published: August 2019

Abstract
The materials used as implants are expected to be highly non toxic and should not cause any inflammatory or allergic reactions in the human body. The success of the biomaterials is mainly dependent on the reaction of the human body to the implant. Titanium and some of its alloys are used as biomaterials for dental and orthopedic applications. The most common grades used are commercially pure titanium and the Ti-6Al-4V alloy. Frequent utilization of titanium and titanium alloys as biomaterials due to their superior biocompatibility, and high corrosion resistance as to form a thin surface oxide layer, and good mechanical properties, as a certain elastic modulus and low density that make that these metals present a mechanical behavior close to those of bones. Strong and totally biocompatible, titanium is one of the few materials that naturally match the requirements for implantation in the human body. Hydrogen peroxide appears in the human body when an inflammation occurs. This research work aims to assess the influence of different concentrations of hydrogen peroxide on the corrosion behavior of Ti-6Al-4V alloy submerged in Hank's physiological solution. Electrochemical methods as Open Circuit Potential and Electrochemical Impedance Spectroscopy were applied for corrosion investigations. The results provide evidence that Ti-6Al-4V corrosion resistance is affected by inflammatory conditions presence in Hank solution.