bluuebunny/crossref_metadata_2025_split huggingface dataset:
Estimation of the runoff of the hills of the city of Portoviejo-Ecuador to assess the degree of flooding in the region
Authors: Campos Cedeno A F , Salas Guillen P A , Macias Ramos J L , Sinichenko E K , Gritsuk I I 
Published: November 2019

Abstract
Portoviejo, capital of the province of Manabi is one of the oldest cities on the Ecuadorian coast. It is characterized by a stable temperate climate with an average annual temperature of around 24°C, with annual rainfall patterns of up to 500 mm. It is a city located in a valley, with average height of 40 m. It is surrounded by hills that have heights that reach up to 280 meters above sea level, which potentiates that the continuous runoffs that occur in the rainy season causes problems related to landslides and floods in the lower part. In the present work an estimation of the runoff coming from the hills located in the northeastern areas of the city where the parishes and citadels Progreso, Cevallos, San Pablo and Briones are located. The capacity of conduction of existing rainwater collectors in comparison with the runoff values obtained is also analyzed. The results obtained constitute an approximation of runoff values for return periods of 1, 2, 5, 10, 20, 50 and 100 years, which are an input for the repowering of existing works and for the design of infrastructure works complementary to the control of floods and landslides in the area.
Exchanging traditional pumping unit for a “Geron” hydraulic drive
Authors: Drozdov A N , Blokhin S A , Pak D X , Zemlianskii G S , Yurtov M P , Antonenkova A Y 
Published: November 2019

Abstract
This work was devoted to analysis of the efficiency of the application of a “Geron” hydraulic drive as an alternative to a beam pumping unit. The issue of replacement old drives for new one was considered in the context of economic profitableness taking into account field conditions of Russia and neighbor countries. To prepare this scientific article, different data about field experience of usage the machines in different countries and fields were asked for and obtained. Thanks to information got general characteristics of both machines with their advantages and disadvantages based generally on technological, energetical and economic data were composed. After this the drives were compared with each other. As a result, hydraulic drive “Geron” was taken to be a good alternative of traditional pumping unit.
Water and gas mixture characteristics calculation and its possible injection variants
Authors: Drozdov A N , Narozhnyy I M , Mereutsa A M 
Published: November 2019

Abstract
The aim of this article is the practical application of calculation methodology of water and gas volume injection into the reservoir and optimal parameters of water and gas mixture in Samodurovskoe field in Russia. Calculations were performed using two technologies: water alternating gas (WAG) and simultaneous water and gas injection (SWAG). For each case the optimum volume of water and gas mixture and its components which are injected into the reservoir was calculated. The variant of alternative water and gas injection cannot be applied in oilfield because of existing restriction to maximum flowrate of associated gas in standard conditions. In Samodurovskoe field can be applied water-alternated-gas (WAG) technology. Proper array of gas and water ration phases in reservoir condition with account of associated gas usage was calculated. Optimization of water-gas mixture volume ratio components showed that the biggest effectiveness of oil recovery cannot be reached resulting from abovementioned restriction. This calculation methodology can be used in job execution, it is simple and practical.
Modeling of the conjugation of vortex flows with downstream in ANSYS
Authors: Schesnyak L E 
Published: November 2019

Abstract
Using the new technology of longitudinal circulation currents which allows dissipating the excess kinetic energy, thus preventing riverbed erosion and increasing the reliability and environmental safety of the structure. In modern practice of the design of water discharge structures of high-pressure dams, those special properties of flows are widely used. This allows to solve a number of important engineering problems arising in the practice of operating the structures by using the new innovative approaches to. In the paper, the author offers an interesting solution to the engineering problem – A new mathematical modelling has been created. For this study, the standard software package Fluent in ANSYS R 19.0 is used and the required outcome is compared with experimental results. Consequently, the necessary parameters of the swirling flow which are required when evaluating the conditions for the coupling of the water discharged with the downstream of the dam structure are depend on the attained results.
The penetration modeling of flat obstacles in Ansys Autodyn program
Authors: Kroytor O K 
Published: November 2019

Abstract
The article is devoted to mathematical modeling of flat obstacles punching in Ansys Autodyn software package with the use of finite element method. The tasks of punching flat, composite, two-layer barriers with a drummer at a right angle and 45 degrees angle are considered. With the help of modeling in Ansys Autodyn, the behavior of obstacles is investigated in time and after they are punched by a drummer. In the work, numerical and semi-analytical solutions of the problems were obtained, the results of the solution were presented, comparisons were made and corresponding conclusions were made. A numerical simulation of high-speed collision of barriers with a drummer was carried out, and the rate of through penetration of barriers consisting of several layers was obtained. The layers in the barriers are made up of various materials. The results of numerical simulation of the barrier and the impactor with a conical head are given.
Tree based classification methods for occupancy detection
Authors: Koklu M , Tutuncu K 
Published: November 2019

Abstract
Latest smart buildings are not only be intelligent to allow occupant to control the light, heating, cooling, gas and other systems but also focuses on occupancy detection since accurate occupancy detection can result in saving energy up to 42% as can be seen in literature. For this aim, different autonomous systems including sensors, actuators, microcontroller and etc. are at the development phase for smart buildings. At this point, determination of classification methods to detect the occupancy together with hardware plays crucial role. Having done in this study 3 different classification methods that is based on Machine Learning Methods were applied on benchmark dataset named Occupancy by UCI Machine Learning Repository, 2016. The classifiers are Random Forest, Decision Tree and Bagging. They were chosen by following two principals. First one is to have classifier methods that were not use in literature for benchmark dataset and the second one almost never usage of tree based classifiers in the literature. The Occupancy dataset consists of light, temperature, humidity, CO2 and occupancy. It has been seen that the highest accuracy or prediction ratio was obtained as 99, 368% by Decision Tree method namely; Random Forest. This result was compared with the results of the studies on the same benchmark dataset. It has been seen that it is the second best accuracy ratio after Fuzzy Granulation (Fgf) method among 16 different Machine Learning Based classification methods. Additionally, Decision Tree and Bagging had the accuracy ratio of 99.222% and 99.207, respectively. These ratios are also higher than other methods used in literature but Fgf. Thus this study showed how decision tree can be promising for occupancy detection.
Genesis and evolution of the Hamama volcanic massive sulphide deposits, Egypt
Authors: Mahmoud A S , Dyakonov V V , Kotelnikov A E 
Published: November 2019

Abstract
Hamama Zn-Pb-Cu VMS deposits are hosted along the contact of bimodal metavolcanic sequence and their volcaniclastics in association with quartz-carbonate matrix. Ore forming process include multi-stage steps. 3D interpolation of drill hole database shows that the ore body was affected by multidirectional faults and fracture zones, that later were occupied by carbonates. The origin of carbonates is approached using a C and O isotopic compositions in whole-rock samples. The isotopic data revealed signs of both hydrothermal-sedimentary and hydrothermal-metasomatic processes. The primary gold and sulphide minerals were deposited from exhalations, forming massive sulphide ore then the tectonic processes due to the emergence of two successive phases of granitoids followed by the of post-tectonic dykes provided war to the introduction of carbonates that changed the configuration of the ore deposit and affected its grade. Later diagenetic and metasomatic processes resulted in enrichment of gold in the oxidation zone.
Combined development of oil and salt layers in an oil field
Authors: Malyukov V P , Vorobyev K A 
Published: November 2019

Abstract
The problem of complex development and simultaneous use of hydrocarbon mining raw materials in the oil field is relevant for a number of domestic and foreign fields. Combined development of oil and salt layers in an oil field allows obtain a saline solution to intensify oil recovery from productive layer and create an underground reservoir in salt layer for underground storage of hydrocarbons, including creating an underground gas storage (UGS) in rock salt. Joint development of oil and salt reservoirs in the oil field allows to obtain a salt solution of a certain concentration for subsequent injection into the oil reservoir to intensify the capacity (underground reservoir) in the salt reservoir for underground storage of hydrocarbons, including the creation of an underground gas storage (UGS) of associated petroleum gas in rock salt. In this article, the authors used the method of theoretical, practical and experimental studies of complex development of oil and salt reservoirs in the oil field. For the first time in the world practice, joint development of oil and salt reservoirs was carried out at the Talakan oil field.
The influence of gas appearance on the construction of underground tanks in rock salt
Authors: Malyukov V P 
Published: November 2019

Abstract
The article describes the influence of gas bubbles released during the underground dis-solution of rock salt during the construction of underground tanks for storage of petroleum products on drilling, oil borehole drilling, operation of tanks, and acceleration of the construction of underground tanks in rock salt with a significant gas content. It is revealed that complex use of oil and salt layers of the oil field allows to obtain a mineralized solution to intensify the extraction of oil from the reservoir and to create an underground reservoir in the salt reservoir for underground storage of associated petroleum gas (APG), i.e. to create an underground gas storage (UGS) in rock salt.
Petrographic investigation and geochemical survey of rocks in Inteet area (Nile River State, Sudan)
Authors: Ibrahim M A E , Kotelnikov A E , Ibrahim S A , Kotelnikova E M 
Published: November 2019

Abstract
The aim of the work is to estimate the Inteet area for search for gold mineralization. This area is located between Umm Trambishi and Alsalam area in Nile River State, Sudan. Surrounding territory is a gold-mining region, in which there are known deposits with estimated resources, as well as promising places where local prospecting is carried out. For a preliminary assessment of the prospects of the site is necessary to conduct geological and geochemical studies. Evaluation of the geological environment was carried out both during field work and with a petrographic microscope. 11 thin sections of rock samples have been prepared and petrographically investigated under polarized microscope the mineral compositions, textures, microstructures, degree of alteration and metamorphism have been studied. Geochemical studies were conducted on 32 samples from 25 sampling points. The main results of petrographic investigation and geochemical survey show the presence of hydrothermal alteration zones, which are associated with a high content of elements-indicators of gold mineralization. In general, the territory can be assessed as promising, but requiring further exploration and assessment work.
Performance characteristics of portable air conditioner with condensate-water spray
Authors: Yoon J I , Son C H , Moon C G , Kong J Y , Yoon J H 
Published: November 2019

Abstract
In this research, a device for injecting condensate-water generated from the evaporator into the distributor on the top of the condenser was fabricated as a method for improving the efficiency of the portable air conditioner. To compare the efficiency, the condensation temperature, blowout air temperature, power consumption, cooling capacity, and COP of the system were measured. As a result of the experiment, the condensation temperature dropped by about 6.2 °C. Also, the power consumption of the compressor was reduced by about 0.16 kW and the cooling capacity increased by 0.2 kW. As a result, it was confirmed that the COP increased by about 16 % when the condensate-water was sprayed on the condenser.
Finite-element analysis of thin-walled shells under various parameterization options of their surfaces
Authors: Klochkov Yu V , Nikolaev A P , Sobolevskaya T A , Andreev A S 
Published: November 2019

Abstract
The methods of specifying the middle surface of an elliptical cylinder in curvilinear coordinate systems are described. An algorithm for discretization of an elliptic cylinder by high-precision quadrangular finite elements with a set of nodal variable parameters, which includes components of the displacement vector, as well as their partial derivatives of the first and second orders, is described. Nodal unknowns in global and local coordinate systems are described. Two types of interpolation procedure are presented: vector interpolation of displacement fields, scalar interpolation. Interpolation expressions for the components of the displacement vector and their first and second derivatives are obtained using the vector version of the interpolation procedure.
Defining of nonlocal damping model parameters based on composite beam dynamic behaviour numerical simulation results
Authors: Shepitko E S , Sidorov V N 
Published: November 2019

Abstract
The nonlocal model of internal damping is considered in this paper using the Euler-Bernoulli beam with fixed ends as an example. Equation of beam motion considering nonlocal damping is solved by Galerkin method to develop the model. The required number ofeigenmodes is obtained for the beam under an instantly applied distributed load. The influenceof nonlocal damping model parameters variation on the beam vibration process simulation results is shown. The beam is considered under a periodic deterministic distributed load. Defining of nonlocal damping model parameters is carried out using results of numerical three-dimensional finite element simulation. The parameters are defined for the glass fibre reinforced plastic beam with the fixed ends under the instantly applied distributed load. The parameters obtained for two different kernel functions and corresponding standard errors are compared. An opportunity of one-dimensional beam model use for the design of composite elements is shown and justified.
Wavelet-based numerical and semianalytical methods of computational local structural analysis
Authors: Akimov P A , Belostosky A M , Kaytukov T B , Lyakhovich L S , Mozgaleva M L 
Published: November 2019

Abstract
Numerical or semianalytical solution of problems of structural mechanics of high dimensionality is computationally costly process in many cases. However, structural engineer does not normally face the task of obtaining a solution of the problem with high accuracy at all points of the considered domain occupied by the structure. As a rule, all subdomains that are potentially dangerous in terms of structural strength are well known in advance. Operational and variational formulations of boundary problems of structural mechanics with the use of method of extended domain are presented. After corresponding (finite element or finite difference) discretization and passage to governing equations considering problems are transformed to a multilevel space with the use of multilevel wavelet transform (discrete Haar basis is used). Special algorithms of averaging are presented.
Generalizing Darcy’s law for filtration radial flows through porous media
Authors: Rybakov Yu P , Semenova N V , Safarov J S 
Published: November 2019

Abstract
We study the filtration process in porous media and compare the filtration coefficients for two possible geometries of flows: cylindrical and radial ones. Solving balance equations for impurity concentration in the simplest axially-symmetric stationary case, one finds the radial filtration process more effective. Therefore, we restrict our attention to the radial filters with non-homogeneous grain filling. First, we describe the transverse diffusion effect and then suggest the generalization of the Darcy’s filtration law, its dynamical origin being stressed. Using the perturbation method, we find the structure of the Stokes stream function for some particular choices of the porosity.
Development of methodology for calculation of permissible stresses for evaluation of contact strength of cylindrical gears in case of overload
Authors: Belousov Yu V , Shambina S L , Rekach F V 
Published: November 2019

Abstract
The article focuses on the development of methods for determining the allowable stresses to check the contact strength of the spur and helical gears under overload. Short-term overloads in gears occur under the action of maximum moments during the start-up of the device or due to the other reasons. The calculation of these loads is performed to check the static strength of the transmission teeth. The analysis of the limiting state of the material in the working area of the gear teeth was performed using the Pisarenko-Lebedev strength criterion, which is one of the most common strength conditions. The method of calculation of allowable stresses was developed. The calculation of limit stresses for normalized, improved or hardened wheels, as well as for the wheels after hardening by chemical-thermal treatment. The calculation results were compared with the values recommended by the standard. It was shown that the permissible contact stress for helical gears is slightly higher than for straight gears. Practically for all heat-treated steels used in the manufacture of gears, the norm of permissible limit stresses recommended by the standard is higher (in some cases significantly) compared to the stresses required from the conditions of contact strength.
Relaxation of stresses in the elements of reinforced concrete structures
Authors: Zhdanova T V , Larionov E A 
Published: November 2019

Abstract
The issues of calculating and forecasting the long-term safety of reinforced concrete structures and structures are related to the dynamics of their stress state and lead to relaxation problems to take into account the redistribution of stress from concrete to reinforcement. In this paper, an approach based on the concept of the strength structure of structural materials is proposed for their solution. According to this concept, in contrast to traditional hypotheses, the material is considered as the combination of its fractions (links, layers, fibers) with statistically distributed strengths. The loading generates the loss of the power resistance capacity by a part of the element fractions which entails a redistribution of stresses on its whole fractions. As a result of this process, a nonlinear dependence of the strain on stress calculated under the assumption of equal strength of all fractions, arises. A significant role in the evolution of stresses in the components of a reinforced concrete element is played by creep of the material. In the linear formulation for a material with a uniform strength, the stresses are determined by solving a linear integral equation coupled with its rheological equation of a mechanical state. Based on the concept of the statistical distribution of the strengths of fractions, a modification of L. Boltzmann’s superposition principle, well-known in the linear creep theory, is proposed for its applicability and the non-linear dependence of strain on stress. This allows the derivation of a linear integral equation with respect to the so-called structural stress experienced by the part of the element component capable of force resistance. The desired design stress is determined by solving an algebraic equation relating structural and design stresses. The proposed approach greatly simplifies the establishment of stress estimates in the components of structural elements required in the long-term safety forecast of structures.
Maneuvering the secondary surface morphology of electrospun poly (vinylidene fluoride) nanofibers by controlling the processing parameters
Authors: Zaarour Bilal , Zhu Lei , Jin Xiangyu 
Published: November 2019

Abstract
Tailoring surface of fibers has been attracting the attention of researchers in different fields and applications. Nowadays, appreciations to the electrospinning technique, polymeric nanofibers are easily producible. The electrospinning process has been prominently investigated and developed during the last decade. The influence of working parameters on the secondary surface morphology of electrospun fibers is very significant. In this study, the effect of processing parameters (applied voltage, flow rate, distance between the tip of the needle and the collector (DTC), diameter of the needle, and rotation speed of the drum collector) on the secondary surface morphology (e.g. porous, grooved, and rough) of electrospun poly (vinylidene fluoride) (PVDF) fibers are studied. The results indicate that the secondary surface morphology of electrospun PVDF fibers can be alerted by maneuvering applied voltage, flow rate, DTC, and rotation speed of the drum collector. However, there is no relationship between the secondary surface morphology of electrospun PVDF fibers and the diameter of the needle. Importantly, fibers with different secondary surface morphologies have the ability to be served in different applications such as energy harvesting, oil cleanup, filtration, and so on. We believe this study can be served as a good reference for generating electrospun fibers with the desired structure by controlling the processing parameters.