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Seasonal Distribution of the Radio Wave Refraction Index over the Territory of Buryatia 布里亚特地区无线电波折射率的季节分布
IF 0.4
Journal of Siberian Federal University-Mathematics & Physics Pub Date : 2022-01-11 DOI: 10.25205/2541-9447-2021-16-2-5-13
A. Bazarova, R. S. Sychev, A. Bazarov, E. Atutov, Y. Bashkuev
{"title":"Seasonal Distribution of the Radio Wave Refraction Index over the Territory of Buryatia","authors":"A. Bazarova, R. S. Sychev, A. Bazarov, E. Atutov, Y. Bashkuev","doi":"10.25205/2541-9447-2021-16-2-5-13","DOIUrl":"https://doi.org/10.25205/2541-9447-2021-16-2-5-13","url":null,"abstract":"The values of the atmospheric refraction index N for ultra-short radio waves for the territory of Buryatia according to the data of meteorological stations were calculated. The monthly average values N contours maps for the central months of the seasons of 2020 were constructed. It is shown the humidity of Lake Baikal and the relief significantly influence N. On average, the values of the refractive index near the lake are 20–30 N-units higher. It is revealed the monthly average N values have maxima in winter and summer with minimums in spring and autumn, with the main maximum occurring in July.","PeriodicalId":43965,"journal":{"name":"Journal of Siberian Federal University-Mathematics & Physics","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80821436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Acoustic Nature of “Storm Nose”, “Supercell” Vortices and Tornadoes “风暴鼻子”、“超级单体”漩涡和龙卷风的声学性质
IF 0.4
Journal of Siberian Federal University-Mathematics & Physics Pub Date : 2022-01-11 DOI: 10.25205/2541-9447-2021-16-2-71-80
V. I. Pinakov
{"title":"The Acoustic Nature of “Storm Nose”, “Supercell” Vortices and Tornadoes","authors":"V. I. Pinakov","doi":"10.25205/2541-9447-2021-16-2-71-80","DOIUrl":"https://doi.org/10.25205/2541-9447-2021-16-2-71-80","url":null,"abstract":"The process of cumulonimbus cloud Cb calvus formation in the middle latitudes of real atmosphere is analyzed in this work. Its transformation from initial lifecycle stage to “maturity” undergoes due to the formation of the waveguide called “aerial acoustic channel” in the troposphere near the level of temperature minimum that is close to 2 km altitude. This “aerial acoustic channel” can be considered as analog of “deep sound channel” that corresponds to the minimal sound speed level. Tropospheric “channel” related to the thermal inversion zone is almost unlimited horizontally. Synchronous generation of two compression waves (ascending one above Cb and descending one inside Cb) is caused by Cb calvus dome ascension. The first one can provoke the aerodynamic draft previously unexplained. The second one results in the growth of its “storm nose” and in the axial and peripheral descending mechanisms in Cb. The penetration of Cb into stratosphere results in the destruction of dynamic balance around Cb top and hence in its unloading in the descending decompression wave. Here the air cools down to the “dew point” in the place of conjugation with parental cloud – due to Snellius law it results in the formation of aerosol “vortex” as condensation front; this “vortex” has calculated value of its generatrix against vertical. Due to D. Snow’s criterion, this vortex forms either “supercell” vortex or tornado vortex.","PeriodicalId":43965,"journal":{"name":"Journal of Siberian Federal University-Mathematics & Physics","volume":"24 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74001945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Melting Point of Carbon Particles behind the Gas Detonation Front 气体爆轰锋后碳粒子的熔点
IF 0.4
Journal of Siberian Federal University-Mathematics & Physics Pub Date : 2022-01-11 DOI: 10.25205/2541-9447-2021-16-2-59-70
E. Prokhorov
{"title":"Melting Point of Carbon Particles behind the Gas Detonation Front","authors":"E. Prokhorov","doi":"10.25205/2541-9447-2021-16-2-59-70","DOIUrl":"https://doi.org/10.25205/2541-9447-2021-16-2-59-70","url":null,"abstract":"A mathematical model of gas detonation of fuel-enriched mixtures of hydrocarbons with oxygen has been formulated, which makes it possible to numerically study the equilibrium flows of detonation products in the presence of free carbon condensation. Reference data for graphite were used to describe the thermodynamic properties of carbon condensate. The calculations are compared with the known results of experimental studies in which, when detonating an acetylene-oxygen mixture in a pipe closed at one end, it is possible to obtain nanoscale particles from a carbon material with special properties. It is assumed that the melting point of such a material is lower than that of graphite and is about 3100 K. Only with such an adjustment of the melting temperature, the best agreement (with an accuracy of about 3 %) was obtained between the calculated and experimental dependence of the detonation front velocity on the molar fraction of acetylene in the mixture.","PeriodicalId":43965,"journal":{"name":"Journal of Siberian Federal University-Mathematics & Physics","volume":"99 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81190047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fracture of Protective Structures from Heavy Reinforcing Cement During Interaction with High-velocity Impactor 重型增强水泥防护结构与高速撞击体相互作用时的断裂
IF 0.4
Journal of Siberian Federal University-Mathematics & Physics Pub Date : 2021-12-01 DOI: 10.17516/1997-1397-2021-14-6-779-786
P. Radchenko, S. Batuev, A. Radchenko
{"title":"Fracture of Protective Structures from Heavy Reinforcing Cement During Interaction with High-velocity Impactor","authors":"P. Radchenko, S. Batuev, A. Radchenko","doi":"10.17516/1997-1397-2021-14-6-779-786","DOIUrl":"https://doi.org/10.17516/1997-1397-2021-14-6-779-786","url":null,"abstract":"In this work, the fracture of a reinforced concrete barrier made of heavy reinforced ce- ment is numerically simulated during normal interaction with a high-velocity titanium projectile. The projectile has the initial velocity 750 m/s. The problem of impact interaction is numerically solved by the finite element method in a three-dimensional formulation within a phenomenological framework of solid mechanics. Numerical modeling is carried out using an original EFES 2.0 software, which al- lows a straightforward parallelization of the numerical algorithm. Fracture of concrete is described by the Johnson-Holmquist model that includes the strain rate dependence of the compressive and tensile strengths of concrete. The computational algorithm takes into account the formation of discontinuities in the material and the fragmentation of bodies with the formation of new contact and free surfaces. The behavior of the projectile material is described by an elastoplastic medium. The limiting value of the plastic strain intensity is taken as a local fracture criterion for the projectile material. A detailed numerical analysis was performed to study the stress and strain dynamics of the reinforced concrete target and the effect of shock-wave processes on its fracture. The influence of reinforcement on the resistance of a heavy cement target to the penetration of a projectile has been investigated","PeriodicalId":43965,"journal":{"name":"Journal of Siberian Federal University-Mathematics & Physics","volume":"32 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87224917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Computer Modeling Deformation of Porous Elastoplastic Materials and Identification their Characteristics Using the Principle of Three-dimensional Similarity 多孔弹塑性材料变形的计算机模拟及三维相似原理识别
IF 0.4
Journal of Siberian Federal University-Mathematics & Physics Pub Date : 2021-12-01 DOI: 10.17516/1997-1397-2021-14-6-746-755
V. Bazhenov, M. Zhestkov
{"title":"Computer Modeling Deformation of Porous Elastoplastic Materials and Identification their Characteristics Using the Principle of Three-dimensional Similarity","authors":"V. Bazhenov, M. Zhestkov","doi":"10.17516/1997-1397-2021-14-6-746-755","DOIUrl":"https://doi.org/10.17516/1997-1397-2021-14-6-746-755","url":null,"abstract":"It is proposed to numerically model large deformations of porous specimens, using the 3D- similarity principle in structural elements, which makes it possible to account for the inhomogeneity of the stress-strain state due to the presence of pores and allows one to vary the number of representa- tive volumes without changing porosity values and dimensions of the specimens. A methodology for determining true deformation diagrams of materials, using the results of compression tests, has been de- veloped. The efficiency of using the 3D-similarity principle is demonstrated by comparing the numerical and experimental results for the example analyzing compression of porous specimens of an aluminum alloy with free lateral surfaces and fixed in a rigid cartridge","PeriodicalId":43965,"journal":{"name":"Journal of Siberian Federal University-Mathematics & Physics","volume":"7 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74717045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Construction of Nonsingular Stress Fields for Non-Euclidean Model in Planar Deformations 平面变形非欧几里德模型非奇异应力场的构造
IF 0.4
Journal of Siberian Federal University-Mathematics & Physics Pub Date : 2021-12-01 DOI: 10.17516/1997-1397-2021-14-6-815-821
M. Guzev, E. Riabokon
{"title":"Construction of Nonsingular Stress Fields for Non-Euclidean Model in Planar Deformations","authors":"M. Guzev, E. Riabokon","doi":"10.17516/1997-1397-2021-14-6-815-821","DOIUrl":"https://doi.org/10.17516/1997-1397-2021-14-6-815-821","url":null,"abstract":"A material with a microstructure is considered. A material is described on the basis of a non-Euclidean model of a continuous medium. In equilibrium, the total stress field is represented as the sum of elastic and self-balanced stresses, the parameterization of which is given through the scalar curvature of the Ricci tensor. It is proposed to use the spectral biharmonic equation to calculate the scalar curvature. Using the example of a plane strain state of a material, it is shown that the amplitude coefficients of elastic and self-balanced fields can be chosen so that singularities of the same type compensate each other in the full stress field","PeriodicalId":43965,"journal":{"name":"Journal of Siberian Federal University-Mathematics & Physics","volume":"104 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88125486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simulation of a Group Impact on a Heterogeneous Target of Finite Thickness 有限厚度非均质靶的群碰撞仿真
IF 0.4
Journal of Siberian Federal University-Mathematics & Physics Pub Date : 2021-12-01 DOI: 10.17516/1997-1397-2021-14-6-700-711
A. Kraus, E. Kraus, I. Shabalin
{"title":"Simulation of a Group Impact on a Heterogeneous Target of Finite Thickness","authors":"A. Kraus, E. Kraus, I. Shabalin","doi":"10.17516/1997-1397-2021-14-6-700-711","DOIUrl":"https://doi.org/10.17516/1997-1397-2021-14-6-700-711","url":null,"abstract":"Numerical simulation of the processes of high-speed loading of homogeneous and heteroge- neous targets by single projectiles, as well as by a group of projectiles with the same parameters in mass and momentum, has been carried out. Based on a comparison of the numerical simulation results for loading targets with different sets of projectiles, it is found that a projectile in the form of a ring knocks out the maximum hole in the target in terms of geometric dimensions, while a set of seven small disks removes the maximum mass from the target. The ring impact forms a continuous spall plate, which outruns the cloud of fragments of the destroyed material. Adding more than 5% of ceramics to the aluminum target volume does not allow the projectiles to penetrate through","PeriodicalId":43965,"journal":{"name":"Journal of Siberian Federal University-Mathematics & Physics","volume":"74 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83296883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Numerical Modelling of Compression Cure High-Filled Polimer Material 压缩固化高填充聚合物材料的数值模拟
IF 0.4
Journal of Siberian Federal University-Mathematics & Physics Pub Date : 2021-12-01 DOI: 10.17516/1997-1397-2021-14-6-805-814
K. A. Chekhonin, V. D. Vlasenko
{"title":"Numerical Modelling of Compression Cure High-Filled Polimer Material","authors":"K. A. Chekhonin, V. D. Vlasenko","doi":"10.17516/1997-1397-2021-14-6-805-814","DOIUrl":"https://doi.org/10.17516/1997-1397-2021-14-6-805-814","url":null,"abstract":"The article presents phenomenological constitutive relations for modeling the compression curing of a highly filled polymer medium, obtained in the framework of the mechanics of an almost incompressible viscoelastic solid using the modified Herrmann variational principle. The relations are based on the representation of the medium as a composition of a fluid and solidified material, taking into account the history of continuous nucleation and deformation of a new phase in the temperature range of phase transformations. During the manufacturing process, different mechanisms lead to process-induced deformations and stresses. These mechanisms depend on thermal expansion, shrinkage, nonlinear viscoelastic properties of the material, and variation in local temperatures. In critical cases, these residual stresses can lead to initial degradation and up to failure of the material. A stable numerical algorithm for the problem’s solution has been developed on the base of finite element method. Numerical investigation of the stress and deformation in system during the polymerization process has been carried out. The evolution of curing stresses in a singular zone of domain has been investigated","PeriodicalId":43965,"journal":{"name":"Journal of Siberian Federal University-Mathematics & Physics","volume":"66 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87271371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Explicit-Implicit Schemes for Calculating the Dynamics of Layered Media with Nonlinear Conditions at Contact Boundaries 接触边界非线性条件下层状介质动力学计算的显隐格式
IF 0.4
Journal of Siberian Federal University-Mathematics & Physics Pub Date : 2021-12-01 DOI: 10.17516/1997-1397-2021-14-6-768-778
I. Nikitin, V. Golubev
{"title":"Explicit-Implicit Schemes for Calculating the Dynamics of Layered Media with Nonlinear Conditions at Contact Boundaries","authors":"I. Nikitin, V. Golubev","doi":"10.17516/1997-1397-2021-14-6-768-778","DOIUrl":"https://doi.org/10.17516/1997-1397-2021-14-6-768-778","url":null,"abstract":"In this paper we consider the problem of dynamic loading of a deformable solid medium con- taining slip planes with nonlinear slip conditions on them. An explicit-implicit scheme was constructed for the numerical solution of the constitutive system of equations, which exactly reduces to correcting the stress tensor values after performing the elastic step. An implicit approximation of the constitutive relations containing a small parameter in the denominator of the nonlinear free term was used with the second order of the approximation. The correction procedure is applicable for those cases when the viscosity parameter of interlayers providing the sliding mode of the contact boundaries is not small. The solution of the problem of the seismic waves propagation in an inhomogeneous fractured geological massif in a two-dimensional case was obtained numerically","PeriodicalId":43965,"journal":{"name":"Journal of Siberian Federal University-Mathematics & Physics","volume":"31 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86895014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Thawing of Permafrost During the Operation of Wells of North-Mukerkamyl Oil and Gas Field North-Mukerkamyl油气田井作业过程中冻土的融化
IF 0.4
Journal of Siberian Federal University-Mathematics & Physics Pub Date : 2021-12-01 DOI: 10.17516/1997-1397-2021-14-6-795-804
M. Filimonov, N. Vaganova
{"title":"Thawing of Permafrost During the Operation of Wells of North-Mukerkamyl Oil and Gas Field","authors":"M. Filimonov, N. Vaganova","doi":"10.17516/1997-1397-2021-14-6-795-804","DOIUrl":"https://doi.org/10.17516/1997-1397-2021-14-6-795-804","url":null,"abstract":"Thawing of ice-saturated rocks due to climate change or various technological impacts will be accompanied by subsidence of the earth’s surface and development of dangerous permafrost geological processes called thermokarst, leading to accidents, which may destruct the wells. Currently, the investment programs of the development of new northern oil and gas fields are restricted. In this regard, reducing the cost of developing the oil and gas fields is an urgent problem. For example, diminishing the area of well pads and maintaining efficiency in the northern oil and gas fields can significantly reduce the costs, in particular, during the design stage. A model of unsteady thermal fields propagation in frozen soil from new well construction for the North Mukerkamyl oil and gas field is developed, taking into account the construction features, the annulus, and the complex lithology of the soil surrounding the well. It is planned to take into account climatic and technological factors, in particular, an annual rest period of well operation, which held from several hours to two weeks. The paper discusses the computational features of the thermal fields calculating in frozen ground from wells and explores the influence of various parameters, which in the computations may lead to a significant increasing of thawing area in the well pads","PeriodicalId":43965,"journal":{"name":"Journal of Siberian Federal University-Mathematics & Physics","volume":"12 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88846405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
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