bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of Relative Molecular Mass of SBS on Low-Temperature Performance of Modified Asphalt
Authors: Peng Ting , Yang Kesheng , Zhou Taoyan , Wu Heng 
Published: January 2022

Abstract
Styrene Butadiene Styrene (SBS) is widely used in pavements because it significantly improves the performance of the modified asphalt. The dosage of SBS has an important effect on the low-temperature performance of the modified asphalt. The difference in relative molecular weight influences the magnitude of the change in low-temperature performance. In this paper, low temperature bending beams rheology test of five different relative molecular weight SBS modified asphalt is conducted at -12°C, -18°C and -24°C to evaluate the low-temperature properties of modified asphalt. Then, the experimental results are analysed. The results show that there is a certain correlation between the relative molecular mass of SBS and the low-temperature performance of modified asphalt. The creep stiffness and creep rate of the modified asphalt are influenced by the relative molecular mass of SBS and temperature. As the relative molecular mass increases, the low-temperature performance of the modified asphalt first rises and then decreases.
Mechanical Mechanism Analysis of Warping and Bulging Of Track Slab of High-Speed Railway in Service
Authors: Liu Yali , Dong Jun , Li Guohua , Chen Xi , Zhang Yunkai 
Published: January 2022

Abstract
Due to warpage and ballooning of high-speed rail track slab caused by debonding and environmental temperature changes during the deterioration of CA mortar layer being extremely concerned in practical engineering, it is based on numerical simulation of typical working conditions and analysis of test model that the deformation dynamics mechanism of track slab of high-speed rail in service is studied in this paper. Firstly, three kinds of damage conditions of CA mortar layer are designed to simulate the partial stress state of track slab under normal, warping and bulging conditions, and the results of model test are compared with those of finite element analysis so that the accuracy and credibility of the numerical simulation method and results are verified. Then, through finite element numerical simulation, the dynamical mechanism of actual full-scale high-speed rail track slab under vibration load is studied. The results show that the warping deformation around the track slab and the bulging deformation in the middle part under the action of positive and negative temperature gradient load caused by environmental temperature change will have a great impact on the structural performance of itself and CA mortar layer; Bulging deformation of track slab is more destructive to its structure than warping deformation. It is of great practical significance to further study the critical position of track plate warpage and bulging deformation, and to optimize and strengthen the structure of this part; The research results are of great significance to further study the deterioration.
Analysis on Dynamic Characteristics and Seismic Response of Wooden Structure of South Gate Building in Jiangzhang Town
Authors: Ren Xiancai , Meng Zhaobo , Wang Xin , Gao Feifei , Zhang Ting 
Published: January 2022

Abstract
In order to study the seismic performance of ancient wooden structures with single eaves and beam lifting in China, the finite element model of the upper floor of the south gate of Jiangzhang town in Shanxi Province was established by using ANSYS. Through modal analysis, the main frequencies and modes of the south gate of Jiangduan were obtained. Through the seismic response analysis of the south gate tower model, the displacement and acceleration response curves of the top nodes of the outer eaves column, golden column and through column under various working conditions of the South gate tower are obtained. The results show that the first and second order frequencies of the South Gate tower model are 1.830Hz and 1.855Hz, and the first two order modes are mainly transitional. With the increase of seismic excitation, the displacement and acceleration response of the top joints of the outer eave column, golden column and through column increase.
Experimental Investigation on Dynamic Performance of Micro-Pile with Predrilled Oversize Hole on Shaking Table Test
Authors: Cheng Laixiu , Chen Gumai 
Published: January 2022

Abstract
For the situation of lacking research on micro-pile with predrilled oversize hole, the key part of semi-integral abutment bridge, the micro-pile-soil interaction shaking table test is carried out by considering the reaming pore diameter, depth, packing and other parameters in the end of the micro-pile to obtain the acceleration, pile moment, displacement and pile-system response frequency and other basic dynamic response and dynamic interaction law. Results show that: 1) the change of predrilled-hole parameters has litter effect on the dynamic properties of soil outside oversize hole; 2) The change of predrilled-hole parameters can cause the change of structural frequency, so led to the change of inertia force of pile head; 3) Inertial interaction has an important influence on the response of the upside part of pile and little influence in the downside part (lower than 15D). These conclusions will provide reference for dynamic response of interaction between pile with predrilled oversize hole and soil and make contribution to the practical application and designing of micro-pile with predrilled oversize hole.
Experimental Study on Mechanical Properties of Repair Materials for Underwater Rapid Construction
Authors: Zhao Shangchuan , Liu Longlong , Zuo Xindai , Wang Shaopeng 
Published: January 2022

Abstract
Several strength grades of sulphoaluminate cement concrete were designed, and the mechanical properties with different mix ratios were studied. This paper mainly analyzes the mechanical properties of sulphoaluminate cement concrete with the setting time test, compressive strength test and flexural test. The test results show that the setting time of cement concrete can be controlled by mixing different admixtures. One hand, the initial setting time increases from 34 min to 340 min, and the final setting time increases from 57 min to 580 min when the incorporated borax content changes from 0 to 1.0 %. Other hand, the initial setting time decreased from 34 min to 11 min, and the final setting time increased from 57 min to 18 min, when the incorporated borax content changed from 0 to 0.5 %. Furthermore, the compressive strength can reach 40 MPa, and the flexural strength can reach more than 2.5MPa after 6 hours of curing. The experiment results illustrate that the setting time and the mechanical properties satisfy the needs of the rapid construction requirements under normal temperature conditions.
Analysis of Longitudinal Force of Beam and Rail of Continuously Welded Rails (CWR) on Railway Bridge
Authors: Zeng Zhiping , Hu Ji , Zeng Qiang , Huang Zhibin , Yin Huatuo , Huang Hui 
Published: January 2022

Abstract
To study the longitudinal force of CWR on viaduct, a track-bridge-pier finite element model is established. Taking a multi-span simply supported beam with a maximum span of 32.7m of an elevated CWR as an example, the additional expansion and contraction forces, displacement between rail and beam and the force of pier are calculated, and whether the rail stress meets the requirements when setting constant resistance fasteners is checked. The results show that: (1) For the left and right lines, the maximum additional expansion forces of single strand rail are both 211.13kN, and the maximum relative displacements between beam and rail are both 6.572mm. (2) The maximum value of the additional expansion and contraction forces and the relative displacement between beam and rail of the same line occur at the same position. The left line is at ZFZ29 pier and the right line is at ZFS31 pier. (3) The maximum force of pier in this section is 500.80kN, and the pier numbers are ZFZ27 and ZFS29. (4) The rail stress is less than the allowable stress of 352MPa, and the rail strength meets the requirements.
A mathematical model to study the dynamics of carbon capture in forest plantations
Authors: Altamirano-Fernández A , Rojas-Palma A , Espinoza-Meza S 
Published: January 2022

Abstract
Fast-growing forest plantations play an important role in reducing global warming and have great potential for carbon capture. In this study, we aimed to model the dynamics of carbon capture in fast-growing plantations. A mathematical model is proposed consisting of a tridimensional nonlinear system. The variables involved are the amount of living biomass, the intrinsic growth of biomass, and the burned area by forestry fire. The environmental humidity is also considered, assumed as a parameter by simplicity. The solutions of the model are approximated numerically by the Runge-Kutta fourth-order method. Once the equilibria of the model have been obtained and its local stability determined, the analysis of the model reveals that the living biomass, as well as the stored carbon, decreases in each harvest cycle as a consequence of the negative effects of fire on soil properties. Furthermore, the model shows that the maximum area burned is attained always after the maximum volume of biomass is obtained. Numerical simulations show that the model solutions are reasonable for the growth dynamics of a plantation, from a theoretical perspective. The mathematical results suggest that a suitable optimal management strategy to avoid biomass losses in the successive regeneration cycles of the plantation is the prevention of fires together with soil fertilization, applied to fast-growing plantations.
Computational tool for learning electrostatic physics through the development of a disruptive methodology
Authors: Ramírez-Carvajal L E , Puerto-López K , Castro-Casadiego S 
Published: January 2022

Abstract
A computational tool for learning electrostatic physics is presented through the development of a disruptive methodology. The tool allows the analysis of case studies based on Coulomb’s law, Gauss’s law, Poisson’s equation, and Laplace’s equation with boundary value. The tool was tested using reference exercises for each case study, making use of quantitative and qualitative comparative analysis between the traditional mathematical development and the computational tool. Errors were measured using Likert scale. The quantitative results showed errors of less than 1.8% in all the cases studied, concluding that the tool is effective. The qualitative results showed that the methodology allows a better development of the electrostatics learning process, dynamizing the study of complex topics such as electromagnetic physics theories through interactivity and technological resources, in addition to having a theoretical module developed using agile methodologies that provide dynamism and an intuitive environment to the interface.
Fractal analysis of neuroimaging: comparison between control patients and patients with the presence of Alzheimer’s disease
Authors: Villamizar J , Uribe L , Cerquera A , Prada E , Prada D , Alvarez M 
Published: January 2022

Abstract
Alzheimer’s disease is a neurodegenerative cognitive, affective, and behavioral disorder aligned to the aging process and other coronary diseases. To contribute to the early diagnosis of the disease, a neuroimaging treatment is implemented through a preprocessing to subsequently calculate the fractal dimension associated with these images in order to propose an alternative to the one proposed in medical physics through positron emission tomography. In this work, a comparative analysis is made of a previous work using the Box Counting methodology versus the calculation of the fractal dimension by means of software developed by the researchers based on the same method. The differences between the fractal dimensions of the neuroimages of control patients and patients with the presence of the disease are maintained showing a lower value of fractal dimension in patients with the disease due to the physical deterioration of the brain.
Difficulties in the interpretation of kinematics graphs in secondary basic education students
Authors: Prada Núñez R , Gamboa Suárez A A , Avendaño Castro W R 
Published: January 2022

Abstract
This research reports the findings derived from the identification of the difficulties exhibited by a group of 76 students from different grades of basic secondary education in a private educational institution with an emphasis on science education. The students were given a questionnaire presenting five situations based on the Position-Time graph associated with uniform rectilinear motion of particles. The research approach is of a quantitative nature at a descriptive level with a field design, since it was the students who filled in the instrument. It is highlighted as a finding in the opinion of the students that the subject has been seen in class, but due to the teacher’s methodology it is not fully understood by them. The results show that the students have a long list of difficulties mainly due to the lack of articulation of mathematical concepts in physical contexts, a situation that prevents them from analyzing the proposed statements, reasoning about the approaches, and improving in the process of searching for alternative solutions with clear arguments.
Grant support for the development of peasant farms: the experience of the Trans-Baikal Territory and key problems
Authors: Alekseev A M 
Published: January 2022

Abstract
The article considers the current state of small and medium-sized businesses in rural areas of the Trans-Baikal Territory. In the region, the largest share of agricultural products produced falls on the personal subsidiary farms, while there is a destruction of large-scale commodity production, evidenced by a decrease in the number of agricultural enterprises and organizations. Presently, the Government of the Trans-Baikal Territory is interested in transforming personal subsidiary farms into the status of peasant farms, since they are able to ensure more efficient functioning of small forms of farms. Special attention is paid to the state support of small farms in the region. In the course of the study, the problems of the effectiveness of the use of state support for small forms of management were identified. The priority direction of state support is grant subsidization of peasant farms, while the distribution of grants in the context of municipal districts of the region is uneven. In general, the mechanism of grant support for peasant farms is effective only for areas of the region where animal husbandry traditionally constitutes the basis of agriculture. There are also problems associated with excessive requirements for obtaining grants and insufficient consulting assistance from potential grantees.
Biodiversity of the Ingoda River ecosystem
Authors: Bazarova B B , Tashlykova N A , Yu Afonina E , Kuklin A P , Matafonov P V , Ts Tsybekmitova G 
Published: January 2022

Abstract
The results of a study of the biodiversity of hydrobionts in the Ingoda River are presented. In phytoplankton sixty six taxa of algae with a rank below the genus have been identified. The zooplankton contains 21 species. The species composition of the macrophytobenthos includes 5 taxa. In the flora of hydrophytes, 15 plant species have been identified. The zoobenthos contains 40 species. Our researches have been showed that widespread species prevail in the flora and fauna of hydrobionts in the Ingoda River. Two alien species (Elodea canadensis and Gmelinoides fasciatus) have been recorded in the Kenon Lake. A very rare East Siberian species of mayfly Acanthametropus nikolskyi has been recorded in the Ingoda River zoobenthos.
Acanthodiaptomus tibetanus (Daday, 1908) (Calanoida, Diaptomidae) – a biogeographic relict in the water bodies of Baikal Rift Zone
Authors: Krivenkova I F , Pen’kova O G , Makarkina N V , Sheveleva N G 
Published: January 2022

AbstractA detailed morphological description of the copepodAcanthodiaptomus tibetanusand its geographic distribution on the territory of Irkutsk Region, Buryat Republic, Zabaikalsky Region and Republic of Sakha (Yakutia) within the limits of Baikal Rift Zone is presented for the first time. The authors provided information on the paleogeographic conditions of the territory these crustaceans inhabited and characterized their habitats in brief. An overview of the personal data and available literature on the geographic distribution ofA. tibetanusis given. One of the major results obtained under this study was elucidation of the distribution patterns ofA. tibetanus.In order to understand current distribution patterns of organisms,A. tibetanusin particular, in different basins, we carried out a historical analysis of the relief formation taking into account climatic aspects involved in these transformations.
Influence of meromixia on the distribution of zoobenthos and zooplankton in the salt soda lake Doroninskoe
Authors: Matafonov P V 
Published: January 2022

Abstract
Meromictic soda lakes are considered models of reservoirs of the Early Proterozoic. Lake Doroninskoe belongs to a rare type of moderately salty alkaline soda lake with a carbonate type of salinity and pronounced meromixia. Studies and publications on the zoobenthos of the lake are rare. In 2005–2007, studies of zoobenthos and zooplankton of the lake were carried out. Meromixia of the water column caused the stable presence of zooplankton only in a layer up to 4 m. The distribution of the taxonomic abundance, quantitative development and structure of zoobenthos in the lake corresponds to the stratification of the water column into mixolimnion, chemocline and monimolimnion. Bottom biotopes and water column layers deeper than 4 m were uninhabited, which is probably due to the lack of oxygen and high hydrogen sulphide content in the bottom water layers due to meromixia. A similar distribution of zooplankton in Lake Doroninskoe and its mesocosm model was revealed.
The current state of hydrochemical indicators of Lake Kenon– the cooling reservoir of the TPP
Authors: Usmanova L I 
Published: January 2022

Abstract
A characteristic is given of the current hydrochemical state of the water of Lake Kenon, which is used as a reservoir - a cooler for the Chita TPP. For over 50-years of operation of the station located on its shore, under the conditions of anthropogenic impact, there has been a sharp change in the chemical type of the lakeʼs water. Currently, the predominant anion is the sulfate ion. Above the MPC standard for water of water bodies of fishery significance are the content of magnesium and sulfates and the trace elements: fluorine, vanadium, strontium, molybdenum, copper, tungsten. The concentrations of boron, lithium, bromine are relatively increased, in some samples - iron, manganese, aluminum and barium.
Variations in the radiothermal radiation of the ice cover of Lake Arakhley as a geo-indicator of deformation and cracking
Authors: Venslavsky V B , Kharin Yu V 
Published: January 2022

Abstract
In January-March, 2020-2021, radiophysical studies were conducted of radiothermal radiation intensity for the testing site for Lake Arakhley, Transbaikalia, Russia. The set of equipment consisting of four microwave radiometers for the wavelengths from 0.3 to 2 cm was placed on the shore of the lake mounted on a stationary platform. The temperature and deformation of ice were simultaneously measured at the depth of 0.4 meters in two orthogonal directions: west-east and north-south. The temperature was measured with heat gauges in a vertical profile at the depths of 5, 10, 15, 20 and 40 cm. In the process of contact measurements in the period of cracking, signal impulses were recorded in the channel of the deformation sensor placed in the direction of the lake center (west-east). The measurement results were used in monitoring of the condition of the water body. It turned out that in the periods of registering the deformation impulses, changes in the radio brightness temperature and decrease in the ice temperature were observed. The microwave characteristics correlate with the temperature and deformation of the ice cover and may serve as an indicator of the meteorological conditions of the region.
The impact of the placer gold mining in Eastern Transbaikalia (Russia) on the environment components of river valleys in the Amur River basin
Authors: Zamana L V , Vakhnina I L 
Published: January 2022

Abstract
Based on the results of the analysis of satellite images and field observations, data on the length of the gold-bearing placers disturbed by the development along a number of main tributaries of the Shilka and Argun rivers are presented, the formed technogenic relief forms are indicated. Depending on the method of development, two types of technogenic landscapes have been identified - the excavation-dump with hydromonitor mining and belt trench-dump when washing with drags. The main directions of research on the assessment of placer gold mining in the natural complexes of river valleys are proposed.
Mineralogical information in the diary of D. G. Messerschmidt on the route of the future Siberian expedition of P. S. Pallas: materials for the study of scientific continuity
Authors: Bondar L D , Kurguzova A V 
Published: January 2022

Abstract
This work is aimed at detectinginformation from the field of mineralogy in the documentary heritage of the first scientific expedition to Siberia by D. G. Messerschmidt. The analysis was made of an expedition diary, the original of which is kept in the St. Petersburg Branch of the Archive of the Russian Academy of Sciences, – the fragmentsthat describes Messerschmidt’s Siberian route, coinciding with the future route of P. S. Pallas, who visited many of the Siberian regions that Messerschmidt had explored half a century before. Messerschmidt recorded data on several groups of minerals, including salts, metals, clays, micas, etc.The question of Messerschmidt’s creation of his mineralogical collections, as well as their systematics and cataloging deserves special study. The analysis of the results of the Messerschmidt’sobservations provides material for establishing the influence on Pallas of the first German scientist traveler, despite the fact that Pallas knew well Messerschmidt’s scientific heritage and made his efforts to make it public.
Khanh Thien gold-ore-magmatic cluster (North Vietnam)
Authors: Van Dung Chu , Goryachev N A , Trong Tu Mai , Trung Kien Trieu 
Published: January 2022

Abstract
New data on the gold mineralization related of the Late Paleozoic alkaline complexes of North Vietnam are presented. Two types of gold mineralization associated with syenites and granosyenites have been identified: gold only and gold-polymetallic. Geochemical characteristics are given for both types and the first data on the sulfur isotopic composition of ore minerals.
Deposits of the Udokan-Chineysky ore-magmatic system of Eastern Siberia
Authors: Gongalsky B 
Published: January 2022

Abstract
The aggregate of ore deposits localized in the Udokan-Chineysky ore district is unique and is the result of multi–stage, polygenetic formation. The deposits of copper and other metals formed at various depths occur within a limited area. The oxide and sulfide ore are spatially associated in the sedimentary rocks pertaining to the Paleoproterozoic Udokan Supergroup and the intrusive mafic–ultramafic rocks of the Chineysky Complex. The granite rocks of the Kodar Complex and gabbro rocks of the Chineysky Complex also date back to Paleoproterozoic. The same age has been established for metasomatic Nb–Ta–Zr–REE–Y and U mineralization in the albitized terrigenous rocks of the Udokan Supergroup (Katugin deposit and Chitkanda prospect) and U–Pd prospects hosted in terrigenous rocks. The U–REE mineralization superposed on the titanomagnetite deposits in the Chineysky pluton has not analogues in the world’s practice. The occurrences of uranium mineralization have been noted in form of pitchblende and U–Th rims around chalcopyrite grains at the Unkur copper deposit hosted in sedimentary rocks. The enrichment in U and Pb has been documented in crosscutting quartz veinlets with bornite mineralization at the Udokan deposit.