bluuebunny/crossref_metadata_2025_split huggingface dataset:
Characteristics for Microstructure Changes of Unsaturated Coal-bearing Soil under Dry-Wet Circulation
Authors: Fan Yakun , Zheng Mingxin , Wu Junhua 
Published: April 2021

Abstract
The macroscopic mechanical properties of soil are essentially determined by its microstructure, which is a comprehensive manifestation of the external microstructure of soil. This paper conducts microscopic tests on coal-bearing soil with different moisture content under dry-wet circulation conditions, and uses Image-Pro Plus software to preprocess and image the SEM images of coal-bearing soil samples to characterize the size and orientation of coal-bearing soil particles and pores. The microstructure parameters of average diameter and orientation frequency of shape and orientation are quantitatively analyzed, revealing the change rule of the microstructure parameters of unsaturated coal-bearing soil under dry-wet circulation.
Research on Static and Dynamic Load Test of Suspension Bridge with Univalent Hyperboloid Space Cable System
Authors: Xu Jinfa , Xu Wenping , Zhu Guangchuan 
Published: April 2021

Abstract
In this paper, a new model of univalent hyperboloid space cable system suspension bridge is proposed, and a comparative test model of 15 m space suspension bridge and parallel suspension bridge is made. Vertical load test, horizontal load test, partial load test and moving load test were carried out. The results show that compared with the parallel and space cable suspension bridge, the vertical stiffness of the suspension bridge increases slightly, the lateral stiffness is greatly improved and the torsional rigidity is tremendously improved. The space suspension bridge has good wind resisting stability.
Dynamic Finite Element Analysis of the Interaction of Rubber-Soil Foundation and Structure
Authors: Wang Fengchi , Zhao Hengliang , Lu Shan 
Published: April 2021

Abstract
A more reasonable method of semi-infinite foundation analysis was realized in this paper through the introduction of viscous-spring artificial boundary to simulate the radiation damping and elastic recovery performance of the foundation. The viscous-spring artificial boundary is realized by Combine14 element in ANSYS finite element software to realize the real dynamic characteristics of complex rubber-soil foundation under dynamic loading. Firstly, the reliability of the method is verified by comparing the method with the example of numerical solution. Finally, the optimal tunnel shape is obtained by combining the rubber-soil foundation with different shapes of tunnels.
Comparison Thermal Insulation Effects of Different Thermal Insulation Materials for a Roadway Tunnel at Southeast Edge of the Qinghai-Tibet Plateau
Authors: Zhang Kun , Zhu Xiaoming , Yu Hong , Tian Zhizhuo , Mu Yanhu , Bi Guiquan 
Published: April 2021

Abstract
In seasonal frost regions, tunnels are affected by frost damage after excavation. At entrance and exit section of tunnels, thermal insulation layer (TIL) is widely used to mitigate this problem. In this study, a moisture-temperature coupled mathematical model was established. Based on field observed air temperature at entrance section of Altun mountain tunnel, the thermal regime of surrounding rocks was investigated. Moreover, a comprehensive evaluation method was established to evaluate the thermal insulation effects of seven thermal insulation materials. The results showed that, with increase in thickness of TIL, maximum frozen depths of surrounding rocks decreased almost linearly. At the vault (H1), arch hance (H2), foot (H3), and inverted arch (H4) of the tunnel, the thermal insulation effect was different. When the thickness of TIL reached to 5 cm, there would be no seasonal freezing process at the four points. Seven types of TIL were considered for the thermal insulation of the tunnel. The optimal thickness of them was 4.2, 11.0, 5.5, 6.3, 10.2, 12.8 and 8.5 cm. To ensure the surrounding rocks do not experience freezing process, rigid polyurethane foam would be the best choice. Considering the cost, dry process aluminum silicate fiber would be a better one.
Study on Optimization of Excavation Scheme of the Entrance Section of Hongjiaban Tunnel
Authors: Feng Haoran , Zhang Bang , Zhang Hong 
Published: April 2021

Abstract
The choice of excavation method is particularly important for small clear distance tunnel with short distance between two holes.The finite element software is used to simulate the excavation of Hongjiaban tunnel,which obtained a series of laws, such as the stress change of surrounding rock, the stress of supporting structure and the displacement of surrounding rock during the excavation of the tunnel with a small distance, which is helpful to better guide the construction.There are different excavation methods for tunnel excavation under different surrounding rocks. The rock mass of the entrance section of Hongjiaban tunnel is the Class V surrounding rock, and a variety of excavation methods can be used, such as full section method, reserved core soil method and CRD method. Through the numerical analysis of the above three methods, the advantages and disadvantages of each method are discussed, and the most suitable excavation method for Hongjiaban tunnel is optimized.
Research on High-Speed Train Load Spectrum and Bridge Load Effect Spectrum
Authors: Zhou Hongyu , Zhou Yun , Liu Yanan , Tang Qi 
Published: April 2021

Abstract
Based on ANSYS finite element analysis software, a dynamic model of the Beijing-Tianjin intercity railway car-track-bridge system is established to analyze the dynamic response of the bridge under the normal high-speed double-track traffic conditions. Combined with the statistics of actual train operation, the bridge load spectrum represented by wheel/rail force is obtained. With the aid of the rain-flow counting method, the stress data of the weak part of the bridge span is equivalently converted into variable amplitude stress amplitude and the corresponding cycle times are obtained. In this way, the stress spectrum of the Beijing-Tianjin intercity railway bridge in the use reference period is estimated, which provides a certain reference basis for the life assessment of the in-service bridge and the reinforcement of weak parts in the future.
Research on Seismic Performance of Switches with Different Types of Supporting Structure
Authors: Liu Wei , Li Hao , Dong Xinsheng , Li Sheng , Fu Guangzhi , Xue Yaodong 
Published: April 2021

Abstract
As an important type of porcelain-type electrical equipment, switches have been seriously damaged in many earthquake disasters. Studies have shown that different types of supporting structure of switches have significant impact on their seismic performance. This paper takes the medium-voltage and the high-voltage switches in a substation in the high-intensity area as the structural prototype, proposes six different types of supporting structure of switches, and explores the influence of the supporting structure on their seismic performance under different seismic intensities. In addition, the single column supporting high-voltage switch was found to have large displacement under 0.4 g earthquake input, and optimization design is needed for this kind of supporting structure. Seven different optimization schemes were proposed in this paper. It was found that single column supporting high-voltage switch with four bracing and single column supporting high-voltage switch with six bracing have excellent seismic performance in high intensity areas, which can be adopted in the optimization design of single column supporting high-voltage switch.
Seismic Performance of Steel Reinforced Concrete Column-Steel Beam Joints after Exposure to Fire
Authors: Li Junhua , Li Quanping , Zhang Xingqiang , Che Jinru , Ma Chao 
Published: April 2021

Abstract
Low cyclic reversed loading tests of six steel reinforced concrete column–steel beam joints were conducted to study the failure mode, hysteretic character, and shear mechanism of joints that had been exposed to fire. Two test parameters, i.e. the duration of fire exposure and axial compressive ratio were taken into consideration. Test results showed that the failure mode of the joints after exposure to fire was basically the same as that of joints maintained at room temperature. Due to the shear resistance of the steel reinforcement, the maximum loading strength of the joints after fire exposure declined indistinctively, however displacement corresponding to the maximum loading strength increased notably. The rigidity, ductility and energy dissipation of the joints after exposure to fire decreased compared to the joints maintained at room temperature, and the extent of reduction was related to heating time and axial compressive ratio.
Rational Layout and Planning for Children’s Activity Places in Hongkou, Jingan and Xuhui Communities of Shanghai
Authors: Wang Mingming 
Published: April 2021

Abstract
“Shanghai Urban Developing Plan (2017-2035)” puts forward to construct a children friendly city. However, there are few studies focusing on the suitability of children’s activities in Shanghai, and the current situation of children’s activity places in Shanghai is still unclear. In this research, three districts with the largest population density in Shanghai: Hongkou, Jingan and Xuhui, were selected to investigate the current status of children’s activity places, and the problems existing in the districts which hamper the development of children’s activity places is identified. Then, using advanced theoretical and practical experience for reference, the optimization scheme of children friendly districts in Shanghai was put forward.
Preface
Authors: Solovev D B 
Published: April 2021

Abstract
International science and technology conference “Earth science” (ISTCEarthScience) it is a subsection of a big conference the International Scientific Conference “FarEastCon”.
The conference represents an informational platform for accumulation of expert opinion on projects and initiatives that are aimed at implementation of farsighted scientific research and development; it allows to present scientific and practical achievements to a wide circle of researchers.
Sections of the conference are of interest for the broad range of experts in the sphere of development of innovative solutions and organizing events that increase the efficiency of economic and innovative activities.
List of Organizing committee are availble in this pdf.
Research into Clarification Filtration through Synthetic Filtering Partitions
Authors: Salamatov V I , Fetisova S A , Salamatov O V 
Published: April 2021

Abstract
The research presents the results of the study of clarification filtration process of low-concentration sludge suspensions through mixed media filtration systems containing fabric filtering partitions made of synthetic and cotton fibres. It is the kinetics of the clarification process of rougher filtration solutions under study in the research, as well as the stages of the formation of the filtering layer of synthetic filtering partitions are determined; the filtration regime of clarification filtering is analysed; the rate of the increase in the total resistance of the filtering partition in the process of dehydration is evaluated. The data available from the experiments allow providing a mathematical expression for the filtration rate. The influence of structural components of filter fabric on the initial stage of filtration process is taken into account.
Hydrogeochemistry and Hydrogeological Model of CO2-rich Springs on Buryatia Territory (Russia)
Authors: Kharitonova N A , Aseeva A V , Lukanov D D 
Published: April 2021

Abstract
The work presents the results of isotopic-geochemical and hydrodynamic studies of CO2-rich springs of the Tunka Valley, Buryatia. The waters are remarkably diverse in terms of cationic composition, although the dominant anion is hydrocarbonate. In general, the springs studied are characterized by high concentrations of microcomponents. To form these springs, the presence of active deep-seated faults is necessary. Such fractured zones serve as channels bringing gas to the upper horizons of groundwater. The 2D numerical model presented convincingly proves that the Arshan field’s waters are meteoric waters of long-term water circulation (up to 220,000 years).
Simulation Model of Emergency Evacuation in Case of Fire in a Nightclub
Authors: Matveev A V , Maximov A V , Zadurova A A 
Published: April 2021

Abstract
The article is devoted to studying the problem of ensuring people safety and security in case of fires in nightclubs. It is proposed to use the agent-based modeling for estimating evacuation time period, which allows to take into account in the model the following factors: club visitors alcohol intoxication, as well as panic and crush accompanying evacuation process. Based on a Saint Petersburg club example, evacuation model was developed using the AnyLogic simulation modelling system. Two probable evacuation scenarios were considered to estimate time period required for the nightclub visitors evacuation. Results obtained showed that in the said nightclub high risk to human life and health was present.
Use Effect of Unconventional Feed and Mineral Additives on Animal and Poultry Productivity
Authors: Lushnikov N A , Alekseeva E I , Tovkalo M V , Pozdnyakova N A 
Published: April 2021

AbstractThe possibilities of increasing productivity of animals and poultry by using an additive containing selenium, rapeseed cake and complex mineral additive have been studied. An addition of the preparation “Kartsesel” in mixed fodder promoted the increase in digestibility of nutrients, the increase in erythrocytes, hemoglobin in blood, output of conditioned youngsters, profitability of production. Conditioned young growth was obtained more by 19-22 %. Inclusion in mixed fodder at cultivation of goose rapeseed presscake of Siberian selection positively affected the increase of live weight, yield of gutted carcass. Goose of the first experimental group surpassed the control group by live weight by 3.4%, and the second experimental group by 6.1%. Output of gutted carcass of goose receiving rapeseed meal and rapeseed meal in combination with rapeseed oil is 286.13 g and 388.48 g more. Complex mineral additive in the diet of bulls contributed to the increase of live weight of bulls in 15 months of age, slaughter output, profitability of production and improvement of meat quality. The live weight of the control group of bulls not receiving the feed additive made 459.50 kg, and the experimental group made 11.00 kg more. At the same time the level of profitability of production on steers of the experimental group receiving a mineral additive amounted to 13.77% instead of 10.24% in the control group.
Modification of Chestnut Leaf Litter for Application in Water Treatment
Authors: Svyatchenko A V , Sapronova Zh A , Shaikhiev I G 
Published: April 2021

Abstract
The effect of the temperature of heat treatment of chestnut tree waste (CTW) on the turbidity of oil-containing emulsions was studied. A granulometric analysis of the dispersity of particles of heat-treated CTW was carried out. In the experiments, the influence of the heat treatment temperature of the TW on the decrease in the turbidity of the model emulsions of spindle oil was determined. Sorption and desorption isotherms are constructed. Mixing of the sorption material with the model emulsion was carried out with a laboratory mixer for 24 hours. Initial parameters: solution temperature 25 ° C, sorbent quantity 3 g / dm3 The maximum sorption capacity of CTWT relative to spindle oil, according to the results of the studies, was 370 mg / g.
Economic Evaluation of Applying the Technology of Water-Gas Stimulation of Formation to Enhance Oil Recovery
Authors: Narozhnyy I , Narozhnaya E , Ilyenko A 
Published: April 2021

Abstract
An algorithm is represented, which allows analyzing the feasibility of the technology of water-gas stimulation of formation to enhance oil recovery. The authors have logically identified three blocks of the data involved. The first block is the source data. The specifics are determined by a particular field and, accordingly, the water and gas consumption and the electricity tariff for the enterprise. Economic parameters are described as the equipment, project implementation, and depreciation costs. The accounted discount rate and property tax should be determined. The macro parameters that may affect the algorithm results have also been considered. I.e., the costs of the US Dollar and the Brent oil. Among the mining and geological parameters, the oil, water, and gas density have been considered, which determine, respectively, the consumption and the economic component of the project.
sZonal Cr-spinels from Serpentinites in North Western Part of the Greater Caucasus
Authors: Popov Yu V 
Published: April 2021

Abstract
Formation homogenity and geodynamic conditions for the formation of apohyperbasites is an actual problem in geological study of the Paleozoic complexes of the Greater Caucasus. Study results of chromespinelids from serpentinite fragments of Paleozoic tectonic melange in the Western part of the Greater Caucasus (outcrops in Dakhovskiy uplift and Kisha river) tested with electron microprobe methods and processing of the results of elemental analysis using non-parametric statistics lead to the conclusion that apohyperbasites belong to ophiolites of subduction environments. Their composition is close to chromespinelids’ of ophiolite complexes of supra-subduction zones (SSZ) composition. Chromespinelides from the flank of Dakhovskoye uplift are represented by subferrochromite cores with rims of magnetite; transformation of subferrochromites during obduction process (Cr# ∼0.80-0.81, Mg# ∼0.35-0.40 in the least modified cores) in to chromites occurred under the conditions of the greenshist facies and was accompanied with redistribution and removal of aluminum and magnesium, and enrichment with iron and chromium. Chromespinelides from the serpentinites of contact Agarinskiy and Kizilkol’skiy thrust sheets presented with cores of aluminumchromite with relics of chrompicotites (Cr# ∼0.50-0.70, Mg# ∼0.39-0.64), surrounded by rims of ferrochromite – chromomagnetite. This transformation occurred on the boundary of the greenschist and low-temperature zone of the amphibolite facies and was accompanied by the substitution with iron for both two-and trivalent cations.
Predicting Grid Facility Accidents
Authors: Kuznetsova M , Zaripova S 
Published: April 2021

Abstract
Open-source statistics on accidents at transmission and generation facilities in Russia for 2014-2018 has been analyzed to identify key accident causes. This analysis established a correlation between accident rates and staff-involving incident rates. The authors were thus able to predictively model accidents, including those at Russian transmission and generation facilities. Accident forecasting is based on trend/cycle models that account for yearly load maxima and minima.
Passenger Rail Transport: Issues of Functioning in Agglomerations of Millionaire Cities
Authors: Merkushev S A , Khusnutdinova S R , Khusnutdinov R R 
Published: April 2021

Abstract
The article is devoted to the study of the existing system of passenger rail transport in cities with a population of one million. Transport infrastructure is an important element of urban infrastructure and participates in the formation of agglomeration links. The article discusses the issue of the connectivity of the outer zone of the city with the agglomeration due to the existing system of using rail transport. Three cities with a population of one million, with similar socio-economic and physical-geographical characteristics - Yekaterinburg, Kazan and Perm, were selected as territorial objects. The similar and different aspects of the formed passenger railway transport systems are revealed. It is concluded that the integral indicator of the level of development of suburban and intracity transport links of external zones demonstrates a strong Perm lag behind Yekaterinburg and Kazan. Yekaterinburg and Kazan possess highly differentiated links between the individual sectors of the city’s outer zone. The “gap” between cities also takes place without taking into account the integration of electric trains with the metro, and becomes even stronger when taking into account the interaction of the two off-street transport systems.
DNA Sequencing of Bovine Leukemia Proviruses with Determination of the Genetic Status of Isolated Isolates
Authors: Kozyreva N G , Ivanova L A , Stepanova T V 
Published: April 2021

Abstract
This paper presents data on the study of bovine leukemia virus (BLV) polymorphism in the Ulyanovsk region. A phylogenetic analysis of 33 field BLV isolates isolated from seropositive animals was performed. The nucleotide sequence of env and pol gene regions was determined. The study revealed heterogeneity of the studied BLV population by the env gene, which corresponds to 2 genotypes of the virus: IV (97%), VII/VIIA (3%) with confirmation of the dominance of the IV genetic variant of the pathogen in Russia, and homogeneity by the pol gene, expressed in clustering of all analyzed isolates with those representatives of the RRIEVM database and international isolates assigned to clade 1 (100%). The revealed nature and degree of genetic differences/divergences maintain the general trend in the RRIEVM database and do not exceed the existing range.
Geological Features of Volcanic Rocks of the Lower Taiga Ore Area (Russia, Primorsky Krai)
Authors: Ivin V V , Medvedev E I 
Published: April 2021

Abstract
This article is about features of geological structure and composition of volcanic and sedimentary rocks of the Low Taiga area (Russia, Primorsky region). This area is a part of the east Sihote-Alin volcanoplutonic belt, is located in the area of transit from the continent to the ocean. Studings of geological and chemical composition, structure and patterns of placement of the Low Taiga Area’s volcanic sedimentary rocks allow us to complete information about geological and geochemical features of Mesozoic-Cenozoic stage of the formation of the said structure. Unever igneous formations are distributed within this area, classified to Primorsky (turonian senonian), Samarga (maastrichtian), Bogopolsky (Paleocene) and Kizinsky (Miocene) volcanic complexes. Matching volcanic rocks complex’s chemical composition with published data testifies to significant similarity with petrotypes of ternei volcano structure. Besides it was found that the Low Taiga Area’s complexes contain high potassium varieties and vary in contents of rare and rare earth elements. Distribution of incoherent elements of primorsky complex’s volcanics are characterized by increased concentrations of tungsten, zinc, plumbum, thorium, lanthanum, cerium, by low content of niobium, strontium, zirconium and titanium. Samarga complex is characterized by low content of titanium and strontium, by low content of neodymium. Bogopolsky and Kizinsky complexes in the distribution of rare and trace elements have a similar trend appearance with petrotypes, but differ in the level of their concentration.