bluuebunny/crossref_metadata_2025 huggingface dataset:
The impact of Rapid Impulse Compaction (RIC) of large non-cohesive material deposits on the surrounding area
Authors: Dobrzycki Przemyslaw , Ivannikov Alexander L. , Rybak Jaroslaw , Shkodkina Vlada O. , Tyulyaeva Yulia
Published: November 2019

Rapid Impulse Compaction technology makes it possible for improving the ground physical properties, especially when the large thickness of non-cohesive material layers is considered. It is also very efficient for compaction of large deposits of spoil rock from the mining industry or from the demolition works. It also allows making columns out of mining recycled aggregate or construction debris to improve weak cohesive soils. Equipment used in this method ensures fast completion of the work; however, it may cause large noise and severe vibrations. This environmental impact on the neighbourhood and adjacent structures may bring some threats and cause discussions over the technology application limits. Nevertheless, there are effective monitoring tools enabling a control over the whole process, achieving good engineering effects and running the work without negative influence (or within acceptable criteria) to the surrounding buildings and infrastructure facilities. The presented case studies show: how the intensity of vibrations is dependent on the distance from the source of the dynamic impact. In the case of analysed Rapid Impulse Compaction. The results were compared to the previously published results of computer modelling of such an impact. All the research activities were granted by DABI SM BUDNY Company as a part of their Research and Development program. Numerous cycles of vibration monitoring control were conducted on the building site in Wrocław (Poland). The major part of readings was made in course of compaction of non-cohesive layers, partially replaced by sorted debris from crushing of concrete elements from demolition works. Similar results were achieved in course of forming controlled fills composed of spoil material (crushed rock) from the mining industry. The presented research result is a part of the joined Polish-Russian program of training periods under the supervision of Jaroslaw Rybak, PhD from Wrocław University of Science and Technology.
Rock slope stability analysis with a kinematical method for the Nam Phoun dam site project, Laos
Authors: Mboussa Djohn Josia Weaver , Sun Shulin , Zhang Yan , Elenga Hartman Issombo
Published: November 2019

Rock slope stability is one of the major challenges in the rock engineering. In this paper, Kinematical analysis on the right bank slope of Nam Phoun Hydropower station dam site project has been performed according to the planar sliding and wedge sliding. Field investigation was realized and geometrical properties of rock mass collected, the objective in this paper is to evaluate the stability of the dam site and predict the probable mode of failure; Lower hemisphere stereographic projection of different joints set was realized using a commercial Rocscience program called Dipv.6. Planar sliding and wedge sliding failure performed, show that no probable planar sliding and wedge sliding failure can occur on the right bank slope and for the excavation process; the slope face is stable for dip angle equal to 45°.
Sandstone grinding in electromagnetic mill – case study
Authors: Lis Anna
Published: November 2019

The article presents a comparison of the use of a ball mill and an electromagnetic mill for the grinding sandstones, taking into account the obtained grain fractions. The simplified principle of an electromagnetic mill operation has been described, as a relatively new device, which is increasingly gaining popularity. The same amount of feed was mixed with similar values of individual fractions in both devices. On the basis of the obtained results, the performance of both mills was compared and the effectiveness of using an electromagnetic mill was determined for further use.
Transportation of waste in the life cycle analysis
Authors: Gliniak Maciej , Lis Anna
Published: November 2019

The life cycle of the product is an assessment of the potential impact of the product on the natural environment. During the product life cycle, we take into account the stages through which the product passes throughout its entire life cycle. At every stage of the life cycle, transportation is a necessary element which is, unfortunately, significantly harmful to the environment. The paper presents costs and remuneration related to the transportation of waste and finished products. The price of diesel oil has the largest share in the structure of transportation costs. The analysis presents remuneration for the transportation of waste and finished product, taking into account all costs incurred by the carrier. The profitability of product transport is greater than the transportation of waste.
Petrology of granites in the Geramdachansky massif (Verkhoyansk-Kolyma orogenic region)
Authors: Trunilina V. A. , Roev S. P.
Published: November 2019

The authors identified several varieties of different ore content of the late-orogenic and anorogenic granites of the North-east of the Verkhoyansk-Kolyma orogenic region. The purpose of the research was a detailed study of petrography, chemistry, crystallization conditions and geochemical features of granites of one of such massifs – Geramdachansky, which is associated with rare-earth mineralization. The belonging of granites to A-type of the late-orogenic or anorogenic geodynamic setting and wide development of dikes of leucogranites and pegmatites is determined. Typomorphic features of the composition of rock-forming and accessory minerals of granites indicate the beginning of crystallization from the high-temperature melt of the lower crust genesis and saturation of the residual melt of water. Isochronous Rb-Sr age of granites 86-94 million years. Considering the value of primary isotopic ratios of strontium (I0 from 0.71246+/-0.00072 to 0.7213+/-0.0034), granites are derivatives of melting of the crustal material with a model age of protolith on average 2223±151 million years. The presence of almandine-grossular garnet, comparable to eclogite garnets, among the minerals of granites; high-temperature zircon of crust-mantle morphotypes D and J and enriched with native iron chromium can be explained by the presence of the basic rocks within the magma-forming substrates. A rapid increase of the content of all rare earth elements, as well as uranium and thorium from the granites of the main facies to leucogranites and pegmatites up to commercial values, was identified. The melts that formed all these rocks have close and stable high (920-1000°C) temperatures, which suggest the presence of an external heat source, constantly active during the process of formation. These facts and the presence of the dikes of alkaline-basic composition near the granite outcrops with high concentrations of REE allow us to conclude that massif was formed the under the impact of heat and fluids produced by deep mantle magmas.
Investigation of Crustal Deformation by the Means of Directly Defined Spatial Chords – Possibility or Predeterminancy
Authors: Gospodinov Slaveyko , Peneva Elena , Lambeva Tatyana
Published: November 2019

The possible effect of the reductions to the measured distances between the points in a geodynamic geodetic network on the reliability of the subsequently calculated deformations has been analysed. Experimental investigations on the basis of doubly measured spatial chords from the real network and their analogues in UTM-projection have been planned and implemented. Reduction adjustments have been indisputably found to lead to distortion of the deformation model. The problem about block-determined Earth crust deformation has been discussed. A method for calculation of the elements of deformation by geodetic determined linear deformations has been proposed.
The Comparison of the Web GIS Applications Relevant for 4D Models Sharing
Authors: Hejmanowska Beata , Glowienka Ewa , Michalowska Krystyna , Mikrut Slawomir , Kramarczyk Piotr , Opalinski Piotr , Twardowski Mariusz , Guidi Gabriele , Barsanti Sara Gonizzi , Micoli Laura , Malik Umair Shafqat , Gonzalez-Aguilera Diego , Sanchez-Aparicio Luis Javier , Rodriguez-Gonzalveza Pablo , Munoz-Nieto Angel Luis , Mills Jon , Peppa Maria-Valasia
Published: November 2019

The paper presents results of the project: Cultural Heritage Through Time (CHT 2, http://cht2-project.eu) realized accomplished within the framework of the “Joint Programming Initiative in Cultural Heritage” JPI-CH (http://www.jpi-culturalheritage.eu) by an international consortium: Politecnico di Milano (IT), Newcastle University (UK), Salamanca University (ES), and Stanislaw Staszic Scientific Association SSSA (a non-profit organization), (PL). The aim of the project was the integration of 3D models of buildings, cities and landscapes for monitoring and preservation of the cultural heritage. The research was conducted on three levels of detail according to the CityGML standard: LoD0 – regional, landscape scale, LoD1/LoD2 – urban scale, LoD3 – architectural scale, level of detail - building outside. Basing of this assumption, four test sites were selected: i. the city centre of Milan (IT) – urban scale, ii. the medieval walls and the historic centre of Avila (ES) - urban/architecture scale, iii. Hadrian’s Wall and its landscape (UK) – landscape scale, iv. the Fortress Cracow Krakow (PL) - architectural scale. Final 4D models were published on the Internet. The paper presents state-of-the art of the technology of 4D models sharing on the internet. 4D models were understood as 3D models solid one and point clouds changing through the time. Results of the practical initial tests of different software (commercial: Hexagon and CityEngine from ESRI and open-source: 3DHOP and Potree) are also shown. Web site: https://cht2.eu was created where the 4D models are placed for all the project partners.
Petrologic and chronological characteristics and formation mechanism of peperite in the Sanjiang Orogenic Belt in western Yunnan, China
Authors: Cheng Xianfeng , Zuo Qionghua , Peng Mingxing , Liu Deli , Li Xingtao , Ma Wei , Na Zhengqing
Published: November 2019

Jamda-Weixi continent marginal arc belt is an important component to understand the evolution of Paleotethyan. For the first time, the occurrence of peperite is being reported at the bottom of Pantiange Formation in western Yunnan, China. Two types of peperites have been identified, namely fluidal peperite and blocky peperite. LA-ICP-MS U–Pb dating results (253.6±0.7Ma) of dacitic lava showed that the peperite was formed during the late Permian. The peperite was formed during the alternation of active period and quiet period of the volcano in an apparent shallow ocean margin.
Remove the pharmaceuticals from water using selected adsorbents
Authors: Šíblová Daniela , Biela Renata
Published: November 2019

As part of the project of specific university research at the Institute of Municipal Water Management of the Faculty of Civil Engineering, Brno University of Technology, a laboratory test was carried out to try and remove to pharmaceuticals from water using selected sorption materials. The goal of the laboratory test was to compare two selected adsorbents as Filtrasorb F100 and Bayoxide E33 in terms of pharmaceutical removal effectiveness from water. Salicylic acid was selected as a pharmaceutical; which is a colourless organic acid, which is of great importance in the field of dermatology and is a proven tool for various dermatological problems including acne. This is a pharmaceutical that is obtained from the bark of a willow white. Sorbent Filtrasorb F100 is in practice commonly used for the removal of micropollutants, as opposed to the sorbent Bayoxide E33, which is used to remove metals from water. In order to remove pharmaceutical from water, two glass columns were used with internal diameter 4.4 cm filled with said sorption materials. Height of sorbent was elected as recommended by the producer of filter material at least 75 cm. Model water was prepared in laboratories by mixing liquid pharmaceutical into drinking water. Samples of filtered water were taken after 0.5 minute and after or 1, 2, and 4 minutes respective. Totally 9 samples including model water were taken. The analysis of water samples after filtration from individual columns with said sorption materials showed found that Filtrasorb F100 reliably removed to concentration of salicylic acid after half a minute, while Bayoxide E33 started remove the acid but from one minute higher concentrations were onwards measured again. This means that the latter material was oversaturated, and therefore gradually ceased to remove the acid.
A review of human hair heavy metal concentration characteristics from mines in China
Authors: Yang Shuran , Huang Qianrui , Cheng Xianfeng , Qi Wufu , Zhang Xiangqun , Xiang Yungang , Zhang Jiansheng
Published: November 2019

This paper summarized the human hair sampling, treatment and determination methods for heavy metal testing, also organized the researches and analyzed the spatial distribution characteristics of 11 heavy metals (Hg, As, Pb, Mn, Se, Zn, Cu, Cr, Cd, Sb, ΣREEs) contents from human hair pollution caused by the mining activities in China.
The review of geohazards in Xiaolongtan Lignite Deposite
Authors: Yang Shuran , Huang Qianrui , Cheng Xianfeng , Qi Wufu , Zhang Xiangqun , Xiang Yungang , Zhang Jiansheng
Published: November 2019

This paper reviews the various aspects of the Xiaolongtan Lignite deposit mine and summarizes the geological disasters of Buzaoba pit, Xiaolongtan pit and Xindenger dump, including landslides, floods, bench erosion, the physical-mechanical changes caused by spring water and lignite spontaneous combustion.
Dimensional evolution of brick products from the full brick to the present in the Czech Republic
Authors: Fiala Jan , Fiala junior Jan , Mikolas Milan
Published: November 2019

Our presentation describes the evolution of single brick products with an emphasis on the dimensional disproportions, which had changed extremely mainly in the second half of the 20th century. We have to notice that the evolutionary lineage of fired bricks reaches the period of 25.000 years B. C. Around the year 8000 B. C., the production of full bricks started. Another turning point is apparent in the day of 14th April 1883, when in the Czech Republic after the metric reformation, the format of full brick has been set. After that the creation of brick CDm, smooth brick block so-called CDk blocks. In the 60s of the 20th century, the brick blocks of the system “spring, groove” were being created. Since then, the dimensional revolution has begun.
Special brick products and their application
Authors: Fiala Jan , Fiala junior Jan , Mikolas Milan
Published: November 2019

Our presentation describes the evolution of brick special products. Among them, it is possible to incorporate products, which we can find on vertical, but also horizontal constructions. Possibly, we can come across them on the aesthetical element of constructions. When we remind that the first ceramic decorative figure was The Venus of Věstonice. After obtaining this knowledge, we have known for 10.000 years. Many types of modification of full bricks. Not until the last 50 years, we were not able to come across the rapid development. Up to the year 1950, only full bricks were created but in different modifications. Then the boom followed.
Microfiltration in Water Treatment for Removal of Suspended Solids and Natural Organic Matter
Authors: Barlokova Danka , Ilavsky Jan , Kunstek Michal , Kapusta Ondrej
Published: November 2019

At this article are presented membrane separate processes – microfiltration, ultrafiltration, nanofiltration in water treatment and materials and modules used in application of various membrane technologies. Theoretical part is completed with results from pilot plant experiments realised in water treatment plant Klenovec, where was used the microfiltration technology for removal of insoluble substances (expressed by a number of particles) from water. Over the last years water quality has deteriorated in water-supply reservoir Klenovec and this technology was tested for the purposes of modernization of the inefficient technology in water treatment plant. The pilot-plant tests for membrane filtration examination were carried out by using the microfiltration unit AMAYA 5 with a performance of 5 m3/h. Coagulation and flocculation run in two stages. At the first stage, the coagulant is dosing into a static mixer, which led the mixture to the second stage from. The second stage represents the tubular flocculator. In the membrane module, there is placed one ceramic element with a membrane surface of 25 m2, pores size of 0.1 μm, and consisting of 2000 tubules with a diameter of 2.5 mm. The results obtained from pilot plant experiments in WTP Klenovec supported theory, that this process with high efficiency of treatment surface water is suitable for this kind quality of water to obtain water for drinking purposes.
Geothermal Waters of Urganli (Manisa) as a Hydrogeological Model, Western Anatolia, Turkey
Authors: Ozgur Nevzat , Buyuksahin Seher
Published: November 2019

The area of Urganlı is located in the western part of Gediz graben and consists of Paleozoic metamorphic rocks with intercalations of various schists and marbles, Mesozoic limestones and ultrabasic rocks, and Pliocene to recent travertine deposits and alluviums. Mica schists as intercalations in Paleozoic metamorphic rocks form impermeable basement rocks hydrogeochemically. The marble as intercalations in metamorphic rocks is of reservoir rock for geothermal waters. Moreover, these marbles are also aquifer for groundwaters. As impermeable rocks, sedimentary rocks with high quantities of clay contents in Pliocene to recent age play an essential role for enhancement of geothermal waters. Geothermal waters of Urganlı with temperatures of up to 75 °C and reservoir temperatures of up to 180 °C are of Na-HCO3 type whereas groundwaters display Ca-Mg-HCO3 type. Geothermal waters of Urganlı were represented as an hydrogeological model within this study. The Kula volcano in the Gediz rift zone with a last eruption age up to 18,000 a is responsible for heating geothermal waters.
An experimental evaluation of size effect and bearing capacity of footing on non-woven geotextile-reinforced sand
Authors: Shooshpasha I , Tavangar Y , Kharun M
Published: November 2019

Reinforced soil is a composite material in which elements with tensile strength were utilized for reinforcement. Geotextile is the most common material in group of geosynthetics for soil reinforcement. This paper presents the effect of a non-woven geotextile which have a higher failure strain on bearing capacity of rigid footing constructed on sand. A research has been done to investigate the bearing capacity of granular soil with plates which have standard width according to ASTM D 1194. In this study, a total number of 62 model tests were carried out in a laboratory using two square rigid steel plate with the sides of 270 mm and 350 mm. A broad series of conditions was tested by varying parameters such as the location of upper layer of geotextile, number of geotextile layers, width of reinforcement and vertical spacing between layers. In second step a series of tests were additionally carried out by varying of spaces between layers and width of geotextile layers in proportion to increase of depth. The results demonstrated that in all cases non-woven geotextile increases bearing capacity and the maximum bearing capacity was obtained in 4-layer reinforcement system. It is also shown that the optimum value of vertical spaces between layers after the upper one are respectively, 0.30 B, 0.35 B, 0.45 B. In addition, the results indicate that optimum width of the first two layers of reinforcement are 4 B and for the third and fourth one are 3 B and 2.5 B respectively.
The effect of increased deformability of columns on the resistance to progressive collapse of buildings
Authors: Tamrazyan A G , Fedorov V S , Kharun M
Published: November 2019

The article discusses two constructive schemes of the building: two 20-storey buildings, in one model, columns with indirect reinforcement were used, in the other model, longitudinally reinforced columns were used. The calculation was carried out in the software complex Lira SAPR 2015. In the calculation, the finite element method was used in the form of the displacement method. The transition from the continual real model of structures to a discrete computational scheme was carried out by dividing the model into finite element grids with a step of no more than three element thicknesses, the number of degrees of freedom of FE is six. The limit state of reinforced concrete, which characterizes the work of structures in the stage of destruction, the “special” limit state, is considered. A particular limit state is characterized by partial destruction of the structure, but in which there is a resource of residual deformation, necessary for the redistribution of efforts arising from an emergency. Analyzing the calculations of the deformation and strength characteristics of the material with indirect reinforcement according to the normative document, it can be concluded that the characteristics of the material correspond to the operation of the structures when the “special” limit state is reached. The sufficient convergence of the data of the results of research of elements with indirect reinforcement and the theoretical results of calculation according to the normative document is established, which allowed in the modeling to make full use of the resources of elements with indirect reinforcement.
Translucent cover design of solar energy equipment for manufacturing of prefabricated concrete components
Authors: Koroteev D D , Kharun M , Istrakova M , Romero Barrenechea M E
Published: November 2019

Translucent cover is one the main design features of solar energy equipment like solar collector. Its material and layers number influence on overall translucency of the cover and, as a result, on efficiency of the equipment. Formwork, equipped by translucent cover, can be considered as solar energy equipment like solar collector due to similar thermal-physical processes, taking place in it. Such equipment can be used during manufacturing of prefabricated concrete components to speed up the curing process by heating the structures using solar energy. The aim of our research work is determination of optimal layers’ number of translucent cover. The research was made in various climatic conditions. The obtained results testify to certain influence of translucent cover design on efficiency of solar energy equipment. However, this influence depends on climatic conditions.
Comparative study of the AISC-LRFD, Eurocode 3 & SP 16.13330.2017 steel members design
Authors: Gebre T H , Lebed E V , Galishnikova V V
Published: November 2019

This paper presents the comparative design procedures for steel frame elements using three different International design codes, viz. the American Institute of Steel Construction (AISC), the European Code (EC3) and the Russian Design Code (SP). It focuses on the resistance capacity of steel members subjected to different loads, such as tension, compression and flexure. It compares the formulation of all codes that identify their similarities and differences. The comparative study is performed for a compact rolled I sections with different slenderness and lateral bracing lengths. The results are presented graphically in different ways such as strength curves, Moment capacity versus lateral bracing length and normalized graphs. The comparative study shows that the resistance capacity specified by all specifications can be different for some considered cases. For compression member, SP specifications have higher capacity and economical approach. For flexural member, AISC gives higher capacity for inelastic region and EC3 gives higher capacities for elastic region but SP approach is lower for flexural capacity.
Window to floor ratio in the design stage in considering to visual-thermal comfort and safety in building
Authors: Thi Khanh Phuong Nguyen , Tamrazyan A G , Trung Kien Nguyen , Van Luong Pham
Published: November 2019

The building envelope with the openings play an important role in the process energy performance and ensure the well-being in a working space because of the impact of the openings to the visual and thermal comfort of the occupants. When designing buildings and structures, the standards for permissible safety should be taken into account, which are expressed by the value of critical duration of fire and the explosive load. The aim of the study is to propose the integrated approach in determining the rational Window to Floor Ratio to provide the target Daylight Factor, energy efficiency for the tropical climate, in consider to fire and the explosive load using the graphic of the relationship of the Window to Floor Ratio to the target minimum Daylight Factor. The result was shown for tropical of Vietnam, the Window to Floor Ratio was recommended of 15.2% to 18.5% corresponds to recommended target Daylight Factor of 1.35%.
Raft foundations design charts: development and applications
Authors: Pechorskaya S A
Published: November 2019

Presented in this paper design charts for estimating effective depth of raft slabs on elastic foundation are developed in compliance with punching shear design procedures provided by Russian Design Code (SP) for reinforced concrete. Codes’ formulas are generalized to include only independent parameters omitting unnecessary calculations of critical section geometry. Proposed approach considers raft slab effective depth as a function of cross section sizes of vertical members (walls, columns) only. In the conclusion reasonable range of raft slab thickness to column sizes ratios have been established for numerical tests and experiments included in fundamental studies of moderately thick plates and raft slabs resting on elastic foundations.
Aerodynamic features of buildings with runways unit
Authors: Kazurov A , Suslova O
Published: November 2019

Currently, opportunities are being developed and are being considered for using flying taxis in large cities due to promising types of air transport (Flying cars, passenger drones). In the second half of the twentieth century, projects for the development of helicopter transport were developed in the UK and the USA. Within the framework of this project, projects for heliports and buildings that interact with helicopter transport were developed in the UK. This experience is very important in the design of buildings with a runway unit, interacting with advanced air transport. Based on an analysis of projects in the UK and the USA, the authors developed experimental aerodynamic schemes of buildings with a landing unit. These projects were tested in the Virtual Wind Tunnel and implemented with the recommendations received by the authors at TsAGI (Central Institute of Aero hydrodynamics). In architectural design of buildings interacting with air transport, aerodynamics is the most important tool for shaping the spatial and compositional solutions of architectural objects.
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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.