bluuebunny/crossref_metadata_2025_split huggingface dataset:
Identification of paddy fields using temporal NDVI changes in Minamiaso Village, Kumamoto Prefecture, Japan to estimate groundwater recharge
Authors: Amano H , Iwasaki Y , Ichikawa T 
Published: January 2021

Abstract
In Minamiaso Village (Kumamoto Prefecture, Japan), land covers of forests, grasslands, and paddy fields play an important role in groundwater recharge. The land covers have been changed in a past few decades by agricultural systems and natural disasters: landslides, slope failures, and damage of irrigation canals caused by the 2016 Kumamoto earthquake in Japan. In this study, we extracted training data for classifying the land covers, and detected the temporal change of NDVI (Normalized Difference Vegetation Index) for each land cover. To quantify the impact of past land cover change on the groundwater recharge, we need to grasp the area of each land cover with the different hydrological parameters such as infiltration capacities. In the case of paddy fields, its distribution also should be known because the infiltration rates that we investigated vary depending on the paddy fields. We attempted to identify the paddy field distribution by the obtained NDVI values, and confirmed that the paddy field areas near the earthquake faults damaged by the earthquake where are still not usable were well distinguished. The paddy field distribution based on NDVI was almost matched with that based on SAR.
Non-destructive measurement of rice leaf dimension in 3D point cloud
Authors: Rattanasuwan P , Kumazawa I , Kasetkasem T 
Published: January 2021

Abstract
In order to try to improve the yield, knowing the expanding of a leaf by measuring its dimension can be one easy way to monitor the plant growth. While rice is considered to be one of the most important agricultural plant, their leaves are quite difficult to measure the size since they are mostly small and direct measurement could harm the plant. To do so, we deploy the non-destructive system to measure the dimension of the rice leaf from a point cloud. The proposed system takes only photos from a smartphone camera to produce the 3D model of a specific leaf using structure from motion and multi-view stereo. To measure the dimension of the rice leaf in metric units, the scale reference is placed into the scene before the photo taking process to involve it in the reconstruction result. From the reconstructed point cloud, the leaf veins can be extracted in order to find the accurate width of a leaf based on thresholding technique using combination of RGB and HSV spaces. By comparing with measured length of the leaf in point cloud with length of one block in scale reference, we can eventually obtain the distant between each leaf vein in the metric system unit.
Stability Analysis of High-Rise Steel Structure Joints Based on BIM Technology
Authors: Zhandong Ni 
Published: January 2021

Abstract
Because of its light weight, good orientation, strong seismic performance, high degree of industrialization, and short construction period, steel structure has relatively high investment efficiency and is widely used at home and abroad. At present, steel structures have been widely used in various complex high-rise buildings. Many high-floor buildings have many changes in building shapes and large spans, and their analysis difficulty and accuracy requirements are very high. Therefore, the stability analysis of steel structures is particularly important. Under the action of strong earthquakes, the welded parts at the nodes of the assembled high-rise steel structure are prone to rigid fractures, which are the weakest parts in the entire steel structure frame, causing damage to the steel structure nodes, and severe damage can lead to the collapse of the entire frame. In view of this defect, it is necessary to pay attention to the research on the stability of the prefabricated high-rise steel structure nodes. In this paper, combined with BIM technology, taking high-rise buildings as the research object, the linear buckling analysis of the structure is carried out, and the buckling mode, buckling weak parts and buckling load of the structure are obtained. Through the analysis of these data, this article evaluated the influence of the giant beam of this structure on the structural performance.
Application of non-equidistant gray model based on optimization of background value in settlement prediction
Authors: Wei Jiameng , Jiang Huagen , Diao Jianpeng 
Published: January 2021

Abstract
In order to solve the influence of different original data series on model adaptability and fitting accuracy in non-equidistant grey model. Because the background value in the gray model is a key factor affecting the accuracy and adaptability of the model. Faced with this situation, this article uses the Newton-Cotes quadrature formula to optimize the background value, which improves the adaptability and fitting accuracy of the non-equidistant gray model. By constructing the model, the Newton-Cotes quadrature formula is applied to the application of the non-equidistant GM (1,1) modeling method in the settlement and deformation of buildings. The analysis shows that the new model method prediction is more suitable for building settlement monitoring and analysis, and the degree of fit is improved by about 30%. The new model is better than the traditional model.
Research on Deformation Control Measures of Surrounding Rock in Soft Rock Tunnel
Authors: Hao Junsuo 
Published: January 2021

Abstract
In order to study the control measures of soft rock tunnel surrounding rock deformation, based on the restraint effect of shotcrete anchor support on it, a support model was constructed, and numerical simulation was used to compare and analyze the restraint effects of different bolts controlling the surrounding rock deformation. The results show that: With the reduction of the bolt spacing (d), the resin bolt has a significant supporting effect compared with the mortar bolt support, the maximum displacement of the surrounding rock is reduced by 70.69%, and the maximum stress is reduced by 58.81%. With the increase of bolt length (L), compared with mortar bolt support, resin bolt has a more obvious restraint on surrounding rock deformation. The maximum displacement of surrounding rock is reduced by 57.89% and the maximum stress is reduced by 40.23%. When 4.5m <L< 6.m, 0.6m< d< 0.7m, the resin bolt has a significant effect on controlling the deformation of surrounding rock. In other cases, the use of mortar bolts or resin bolts to support the surrounding rock deformation has little significant difference.
Experimental Study on Thermal Expansion Property of Epoxy Mortar in Hydraulic Structure Repairing
Authors: Sun Yufei , He Jingjing , Ma Lingyun , Di Shengjie , Zhang Ying , Liu Jing , Xing Ruijiao 
Published: January 2021

Abstract
The thermal expansion property of epoxy mortar has a significant effect on the repair effect. Experiments were carried out to study the thermal expansion coefficient of epoxy mortar by changing the type of curing agent, various sand binder ratios and sand etc. The results show that the curing agent has a remarkable effect on the thermal expansion coefficient of epoxy mortar. When the type and content of curing agent are fixed, the influence of sand binder ratio and sand type on thermal expansion coefficient of epoxy mortar is relatively small. It is an effective way to reduce the thermal expansion coefficient of epoxy mortar with excellent curing agent. The research conclusion can provide a reliable basis for hydraulic concrete repairing.
Determination of properties of cermet coatings obtained by additive laser technologies
Authors: Biryukov V P 
Published: January 2021

Abstract
The paper presents the results of metallographic and tribological studies of 40Kh steel and multi component coating (Ni-Cr-B-Si, Co-Cr-W-Ni-B-Si) with the addition of 5 and 10 vol.% nano-tungsten carbide powder to the charge. The regularities of changes in the friction coefficients from pressure, sliding speed, jamming load from sliding speed and wear intensity of steel and surfaced coatings are shown.
An optimal experiment planning in the problem of longevity evaluation at crack propagation stage
Authors: Gadolina I V , Romanov A N , Bautin A A , Papic L 
Published: January 2021

AbstractA large number of factors influencing the fatigue crack rate are traditionally studied separately. In this case, their interactions are not taken into account, and the experiment does not possess the property of optimality. The article describes the authors’ vision of the problem, how it would be possible to approach the solution of the research problem from the point of view of the theory of optimal experiment planning. Initially, it is proposed to consider three basic factors, namely: the influence of loading asymmetry, loading frequency and sequence of overloads. A full factorial experiment with varying factors at extreme levels is considered. The formalization of the factors describing the sequence of overloads is proposed.
Structural quality criteria for a surface layer formed by gas pressure nitriding of austenitic steels
Authors: Kuksenova L I , Alekseeva M S , Gress M A , Kozlov D A 
Published: January 2021

Abstract
The tribotechnical efficiency of gas pressure nitriding of austenitic class steels is shown. The characteristics of the structure and operational properties (contact endurance and wear resistance) are given in comparison with cemented steels.
Relation of threshold levels fatigue crack development in low-alloy steel under harmonic and operational loading
Authors: Lebedinsky S , Naumov O 
Published: January 2021

Abstract
The results of experimental studies of the patterns fatigue crack development in samples made of 20GFL steel cut from the cargo over-spring beam are analyzed. The relatio of the threshold stress intensity coefficient Kth, determined from the kinetic diagram of fatigue failure, and the parameters of the threshold level and the operational loading process is estimated.
Local damage to structural materials under low-cycle loading
Authors: Romanov A N 
Published: January 2021

Abstract
The damage accumulation kinetics in plastic (metals) and brittle materials (concrete) at the stages of fracture formation and development under cyclic loading is considered. The regularities of damage accumulation at microlevels due to structural and strain heterogeneity with the achievement of the limit state – the formation of micro-cracks are shownThe early formation curves of micro- and macro-fractures on the fatigue curves, the areas of dispersed fracture formation and development are determined.
Deformation and failure of polymer composites with different layouts under preliminary cyclic and quasi-static loads
Authors: Wildemann V E , Staroverov O A 
Published: January 2021

Abstract
The work presents the results of an experimental study of the mechanical behavior of polymer composite materials (PCM) subjected to sequential cyclic and quasi-static loads at normal temperatures. The methodological features of testing composites under complex mechanical influences are considered. The results of tests for preliminary cyclic and subsequent quasi-static tension of fiberglass specimens with different layouts are given in the fatigue sensitivity’s diagrams. Experimental data have been obtained confirming the difference in the nature of the change in the residual strength of fiberglass with different layouts.
Determination of polymer -substrate joint adhesive strength by means method of pulling fiber from the matrix and normal avulsion
Authors: Sergeev A Yu , Turusov R A , Andreev V I 
Published: January 2021

AbstractExperimental results of polymer binder adhesive strength -metal substrate joint at shift and a normal detachment are given. It is established that the contact – layer method well describes pull-out tests. The model allows to get the parameters of adhesive joint related to the chosen couple adhesive – substrate, which do not depend on sample geometry. It is shown that the contact-layer method well describes pull-off tests and allows to develop recommendations to sample geometry.
The impact of production temperature of synthetic wollastonite filled with rice husk on its composition and modifying effect
Authors: Gotlib Elena , Tverdov Ilya , Phuong Ha Thi Nha , Sokolova Alla 
Published: January 2021

Abstract
Due to finite reserves of naturally occurring wollastonite, production of its synthetic analog on the base of available and renewable raw materials is of paramount importance. In this aspect, the by-products of cereal-processing industry, in particular, rice husk, command great attention of manufacturers. The properties of synthetic wollastonite manufactured on the base of rice husk ash and limestone are affected by the proportion of these components at the greater extent, as well as the synthesis temperature and time defining its phase composition. In this regard, the authors of the paper have studied the impact of production temperature on the structure of synthetic wollastonite and its modifying effect in epoxy compositions as against naturally occurring mineral. The obtained synthetic wollastonite, regardless the synthesis temperature, primarily contains β-wollastonite and larnite as an admixture. For the cost-effective purposes, the optimum temperature for manufacturing synthetic wollastonite on the base of rice husk ash is 800°C. Both naturally occurring and synthetic wollastonite on the base of rice husk enhance hardness of epoxy coatings, whereas the former one increase it in a greater degree due to a higher presence of β-wollastonite of needle-like particles in its composition.
Selection of Reinforcing Fiber for High-strength Lightweight Concrete for 3D-Printing
Authors: Duong Thanh Qui , Korolev Evgenij , Inozemtcev Aleksandr 
Published: January 2021

Abstract
The knowledge of cement concretes and the availability of raw materials allows them to be used for 3D-printing technology in construction. One of the ways to increase the strength and reduce the shrinkage of the extruded layers is the introduction of reinforcing fibers into the mixture. An important task is the selection of effective types and concentrations of fiber. In this work, research on the selection of such fibers for compositions of high-strength lightweight concrete on hollow microspheres has been carried out. The optimal content of fiber which provides an acceptable decrease in mobility and the greatest strength of concrete is 1.25…1.5 % of the mass of Portland cement. It was found that the studied concretes on hollow microspheres have a reliable connection at the «steel-concrete» interface. The adhesion strength to metal reinforcement with a diameter of 8…12 mm is 6.1… 10.1 MPa with a relative deformation of 0.097…0.025 mm/mm. High-strength lightweight fiber-reinforced concrete has low air permeability parameters, corresponding to the high water permeability grade W20. Such concrete with an average density of 1400 kg/m3 has high frost resistance F1800.
The research of moisture sorption characteristics in mineral wool under the Vietnamese climate conditions
Authors: Nguyen Tien Nam , Grabovy Petr 
Published: January 2021

Abstract
The article discusses the characteristics of the sorption wet steam of mineral wool in laboratory experiments, necessary to determine the change in its mass in conditions of high humidity of the environment, already a country with a tropical climate. The results can be used in new construction and renovation of facades of buildings in Vietnam. A feature of the application of thermal insulation materials in the system of thermal insulation of facades of buildings in different climatic conditions is a factor in the durability of the materials, etc. The climatic conditions of Vietnam have significant features such as high average temperatures, humidity, rainfall, and a long rainy season. These parameters affect the durability and thermal insulation qualities of materials in the thermal insulation system of building facades. The characteristics of moisture resistance of mineral wool, which are used in the systems of ventilated facade construction for thermal protection of buildings in the world in Russia, are considered. In the laboratory evaluation experiments made mineral wool sorption characteristics: extract samples under direct contact with different degrees of relative humidity for a month. This test simulates the effects of a tropical climate in the mineral wool in assembly or during operation, when the protective layer is damaged. The result of the experiment shows the dependence of the degree of sorption of humid vapors of mineral wool on the value of the humidity of the air environment and the time of its direct contact with humid air. According to the results of such experiments can make the choice of building types and technologies insulating materials suitable for the climatic conditions of the Vietnamese during the repair and construction works.
The study of interaction between rubber seed oil and epoxy resin
Authors: Gotlib Elena , Cherezova Elena , Lan Anh Nguyen Thi , Sokolova Alla 
Published: January 2021

Abstract
Plant oils are regarded as relatively cheap renewable and sustainable raw materials that could be efficiently used for manufacturing of glues, coatings, flooring and other materials. Among the plant oils, rubber seed oil (RSO) is of particular interest as it contains the large amount of free fatty acids. development of new innovative cost-effective technologies for processing renewable agricultural products of plant origin is of acute practical importance as they are considered as advanced sustainable raw materials for manufacturing the products of “green” chemistry. According to the literature review, free fatty acids could enhance performance of polymer composite materials, in particular, on the base of epoxy polymers. Having applied the methods of infrared spectroscopy and titrimetry, the authors identified the absence of chemical interaction between epoxy resin and rubber seed oil at room temperature. Having used the data of differential scanning calorimetry, it was stated that epoxy resins react with rubber seed oil at elevated temperatures.
Increasing the technology of waterproofing from bentonite mortars for construction, reconstruction and overall repair of a building
Authors: Korol Elena , Petrosyan Rima , Smirnova Nadezhda 
Published: January 2021

Abstract
Subject: The article investigates the parameters of the technological processes of arranging underground injection waterproofing from bentonite solutions for construction, reconstruction, and overhaul of buildings in cramped conditions, taking into account the features of mechanization of work, the number and qualifications of workers. Based on the results of the timekeeping studies carried out in experimental conditions, the costs of working time for performing technological operations on the arrangement of underground waterproofing with an injection compound from bentonite solutions were determined. Considering the identified technological features, the number and qualifications of workers have been established during the work on the arrangement of injection waterproofing from bentonite solutions.
Thermal conductivity of geopolymer concrete with different types of aggregate
Authors: Krotov Oleg , Gromyko Pavel , Gravit Marina , Belyaeva Svetlana , Sultanov Shukhrat 
Published: January 2021

Abstract
In this article the influence of aggregate of geopolymer concrete used in concrete printing of buildings and structures, architectural elements on its thermal conductivity is studied. All tests were conducted on device for measuring thermal conductivity called PIT-2 designed to measure the thermal conductivity of building and heat-insulating materials under stationary thermal conditions in accordance with ISO 7345:1987* and ISO 9251:1987. As the fine aggregate most commonly used river sand, quartz sand, ceramic foam, as well as one new coniferous shavings were taken. The results of 4 tests to determine the thermal conductivity of geopolymer concrete with various aggregates are listed in the summary table in the study. According to the test results, the lowest coefficient of thermal conductivity has geopolymer concrete on ceramic foam. In this study geopolymer concrete is considered as the main material for concrete printing of the houses and architectural forms. This material reduces CO2 emissions in the atmosphere.
Method for measuring deflections of monolithic floors in conditions of poor visibility of the structure
Authors: Perunov Aleksandr 
Published: January 2021

Abstract
The article shows the method of testing for determining deflections in the slab covering the basement of a residential complex under construction with underground parking. The features of the construction of this section of the building and the reasons for conducting additional research of the erected structures are described. A description of the structures of the studied part of the building, their defects and damages acquired during construction is given. The article describes the methodology and methods used to determine deflections from the control load in conditions of limited visibility due to the presence of mounted engineering systems, as well as restrictions on access to the structure due to the presence of reinforcement elements on its surface. Features of measurements and advantages of combined research methods to ensure the reliability and speed of analysis of the results are described. Based on the results of the research, this article draws conclusions about the possibility of using Express methods for assessing the stress-strain state of building structures, using the example of a residential building with underground parking that has been erected and is being put into operation.
The main causes of accidents of space lattice Kislovodsk-type structures
Authors: Kodysh Emil , Trekin Nikolay , Chaganov Aleksej , Bobrov Vladimir , Shmakov Sergej 
Published: January 2021

Abstract
The article deals with the operation problems of space lattice constructions (SLC) of the Kislovodsk-type, revealed as the results of a survey of more than ten structures within the period from 2000 to 2020. The main causes of accidents of the SLC system was revealed and presented. The disadvantages of production mounting of the Kislovodsk-type system with a hidden capital are considered; the recommendations for preventing the displacement of the SLC support connectors of the Kislovodsk-type system with a hidden capital are presented. As an example, the collapse causes of the Kislovodsk structure made with a hidden capital according to a rare scheme operated in Syktyvkar were analysed in the work. The results of numerical study of the load-bearing capacity of constructions made in CAD SCAD 21.1.1.1 were presented. The most common structural defect of this type – the elements overload of the SLC system is considered in this work. The calculation showed that the structural plate has a three times overload of 35% of the elements (compressive stability, strength). The overload is connected with the normative load increase of snow cover in 2003 and in 2016, and the weighting of the roof structure (twice as compared to the production solution) during its repair work. The load calculation was based on the survey of the SLC constructions. Based on analysis of constructions of this type, the authors give the recommendations on the list of works required for additional inclusion in the survey program of the technical condition of constructions.