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St Petersburg Polytechnic University Journal-Physics and Mathematics最新文献

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The EOS choice effect on the simulated results obtained for an underwater electrical explosion of conductors EOS选择对导体水下电爆炸模拟结果的影响
IF 0.2
St Petersburg Polytechnic University Journal-Physics and Mathematics Pub Date : 2017-10-01 DOI: 10.1016/J.SPJPM.2017.09.001
A. I. Ryakhovskiy, V. Antonov, N. Kalinin
{"title":"The EOS choice effect on the simulated results obtained for an underwater electrical explosion of conductors","authors":"A. I. Ryakhovskiy, V. Antonov, N. Kalinin","doi":"10.1016/J.SPJPM.2017.09.001","DOIUrl":"https://doi.org/10.1016/J.SPJPM.2017.09.001","url":null,"abstract":"","PeriodicalId":41808,"journal":{"name":"St Petersburg Polytechnic University Journal-Physics and Mathematics","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87221740","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: 2
Formation of the angular dependence of intensity of the light scattered on the optically dense atomic ensemble 光密集原子系综上散射光强度角依赖性的形成
IF 0.2
St Petersburg Polytechnic University Journal-Physics and Mathematics Pub Date : 2017-10-01 DOI: 10.1016/j.spjpm.2017.09.011
Nikolay V. Larionov
{"title":"Formation of the angular dependence of intensity of the light scattered on the optically dense atomic ensemble","authors":"Nikolay V. Larionov","doi":"10.1016/j.spjpm.2017.09.011","DOIUrl":"10.1016/j.spjpm.2017.09.011","url":null,"abstract":"<div><p>The probe light scattering on the cold optically dense atomic ensemble is studied theoretically in the paper. In order to describe multiple scattering of light in the context of quantum electrodynamics, the Konstantinov–Perel–Keldysh diagram technique has been used. This technique allows to rewrite the considered case of light scattering in terms of diagram series where each term describes incoherent scattering of certain order. Decoding these terms allowed us to obtain the explicit analytical expression for the cross-section of multiple incoherent scattering for the case of stationary two-level atoms (transition <em>J<sub>g</sub></em> = 0 → <em>J<sub>e</sub></em> = 1). The numerical analysis of this expression carried out by applying the Monte-Carlo simulation made it possible to find an influence of different orders of scattering on forming the angular dependence of scattered light intensity.</p></div>","PeriodicalId":41808,"journal":{"name":"St Petersburg Polytechnic University Journal-Physics and Mathematics","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.spjpm.2017.09.011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73450122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An inverse problem for the equation of membrane's vibration 膜振动方程的反问题
IF 0.2
St Petersburg Polytechnic University Journal-Physics and Mathematics Pub Date : 2017-10-01 DOI: 10.1016/j.spjpm.2017.09.009
Dmitriy S. Anikonov , Yaroslav A. Kipriyanov , Dina S. Konovalova
{"title":"An inverse problem for the equation of membrane's vibration","authors":"Dmitriy S. Anikonov ,&nbsp;Yaroslav A. Kipriyanov ,&nbsp;Dina S. Konovalova","doi":"10.1016/j.spjpm.2017.09.009","DOIUrl":"10.1016/j.spjpm.2017.09.009","url":null,"abstract":"<div><p>A mathematical model for membrane's vibration process is used in this paper. The model is based on seeking a solution of the second-order hyperbolic differential equation. A new inverse problem is set and investigated in two versions. In the first version the known data are as follows: the coefficient defining the phase velocity, the starting data of the Cauchy problem, the Cauchy problem solution on two given planes, derivatives of the solution along the vector being normal to these planes. The challenge has been in localizing the support of the right-hand side of the equation for vibrations. The algorithm permitting to find the bounded domain containing the unknown support was designed. In the second version the algorithm refers to the case where the coefficient defining the phase velocity is unknown but an interval of its possible values is known. A series of runs was performed to illustrate the proposed model.</p></div>","PeriodicalId":41808,"journal":{"name":"St Petersburg Polytechnic University Journal-Physics and Mathematics","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.spjpm.2017.09.009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73561846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Stage-by-stage modeling of the mechanism of semiconductor–metal phase transition in vanadium dioxide 二氧化钒中半导体-金属相变机理的逐级模拟
IF 0.2
St Petersburg Polytechnic University Journal-Physics and Mathematics Pub Date : 2017-10-01 DOI: 10.1016/J.SPJPM.2017.09.002
A. V. Il'inskiy, M. E. Pashkevich, E. B. Shadrin
{"title":"Stage-by-stage modeling of the mechanism of semiconductor–metal phase transition in vanadium dioxide","authors":"A. V. Il'inskiy, M. E. Pashkevich, E. B. Shadrin","doi":"10.1016/J.SPJPM.2017.09.002","DOIUrl":"https://doi.org/10.1016/J.SPJPM.2017.09.002","url":null,"abstract":"","PeriodicalId":41808,"journal":{"name":"St Petersburg Polytechnic University Journal-Physics and Mathematics","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77450560","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: 2
WITHDRAWN: Synthesis and energy transfer from Dy3+ to Sm3+ in halosulphate phosphor for solid state lighting applications 撤回:固态照明用卤代硫酸盐荧光粉中Dy3+到Sm3+的合成和能量转移
IF 0.2
St Petersburg Polytechnic University Journal-Physics and Mathematics Pub Date : 2017-09-25 DOI: 10.1016/J.SPJPM.2017.08.002
S. Taide, K. A. Koparkar, N. Ingle, S. K. Omanwar
{"title":"WITHDRAWN: Synthesis and energy transfer from Dy3+ to Sm3+ in halosulphate phosphor for solid state lighting applications","authors":"S. Taide, K. A. Koparkar, N. Ingle, S. K. Omanwar","doi":"10.1016/J.SPJPM.2017.08.002","DOIUrl":"https://doi.org/10.1016/J.SPJPM.2017.08.002","url":null,"abstract":"","PeriodicalId":41808,"journal":{"name":"St Petersburg Polytechnic University Journal-Physics and Mathematics","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2017-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89582795","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
Wireless networks of energy efficient dynamically controlled LED sources 无线网络节能动态控制LED光源
IF 0.2
St Petersburg Polytechnic University Journal-Physics and Mathematics Pub Date : 2017-06-01 DOI: 10.1016/j.spjpm.2017.05.006
Andrey V. Aladov , Vladimir P. Valyukhov , Vladimir D. Kuptsov , Aleksander L. Zakgeim , Michail N. Mizerov , Sergey V. Demin , Anna V. Valyukhova
{"title":"Wireless networks of energy efficient dynamically controlled LED sources","authors":"Andrey V. Aladov ,&nbsp;Vladimir P. Valyukhov ,&nbsp;Vladimir D. Kuptsov ,&nbsp;Aleksander L. Zakgeim ,&nbsp;Michail N. Mizerov ,&nbsp;Sergey V. Demin ,&nbsp;Anna V. Valyukhova","doi":"10.1016/j.spjpm.2017.05.006","DOIUrl":"10.1016/j.spjpm.2017.05.006","url":null,"abstract":"<div><p>The paper presents the results of development and practical implementation of wireless networks of controlled spectrally tunable light emitting diode (LED) light sources using RF transceivers operating in the unlicensed frequency bands of 868 and 2400<!--> <!-->MHz. Such sources allow synthesizing either a white light with various color temperatures or a colored light with different tints; they are of significant interest in connection with general lighting and with some special applications. The problems of practical realization of light sources and their optimization with respect to luminous efficiency, dynamic range and the distance of wireless control have been investigated.</p></div>","PeriodicalId":41808,"journal":{"name":"St Petersburg Polytechnic University Journal-Physics and Mathematics","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.spjpm.2017.05.006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80074392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Clustering algorithms application to forming a representative sample in the training of a multilayer perceptron 聚类算法在多层感知器训练中形成代表性样本的应用
IF 0.2
St Petersburg Polytechnic University Journal-Physics and Mathematics Pub Date : 2017-06-01 DOI: 10.1016/j.spjpm.2017.05.004
Aleksey A. Pastukhov, Aleksander A. Prokofiev
{"title":"Clustering algorithms application to forming a representative sample in the training of a multilayer perceptron","authors":"Aleksey A. Pastukhov,&nbsp;Aleksander A. Prokofiev","doi":"10.1016/j.spjpm.2017.05.004","DOIUrl":"10.1016/j.spjpm.2017.05.004","url":null,"abstract":"<div><p>In this paper, we have considered the problem of effectively forming the representative sample for training a neural network of the multilayer perceptron (MLP) type. An approach based on the use of clustering that allowed to increase the entropy of the training set was put forward. Various clustering algorithms were examined in order to form the representative sample. The algorithm-based clustering of factor spaces of various dimensions was carried out, and a representative sample was formed. To verify our approach we synthesized the MLP neural network and trained it. The training technique was performed with the sets formed both with and without clustering. A comparative analysis of the effectiveness of clustering algorithms was carried out in relation to the problem of representative sample formation.</p></div>","PeriodicalId":41808,"journal":{"name":"St Petersburg Polytechnic University Journal-Physics and Mathematics","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.spjpm.2017.05.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74618087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
On the initial state of the universe in the theory of inflation 论暴涨理论中宇宙的初始状态
IF 0.2
St Petersburg Polytechnic University Journal-Physics and Mathematics Pub Date : 2017-06-01 DOI: 10.1016/j.spjpm.2017.05.008
Natalia N. Gorobey, Alexander S. Lukyanenko, Mikhail V. Svintsov
{"title":"On the initial state of the universe in the theory of inflation","authors":"Natalia N. Gorobey,&nbsp;Alexander S. Lukyanenko,&nbsp;Mikhail V. Svintsov","doi":"10.1016/j.spjpm.2017.05.008","DOIUrl":"10.1016/j.spjpm.2017.05.008","url":null,"abstract":"<div><p>A toy quantum model of the inflationary universe is considered in which the role of cosmic time is played by the inflaton scalar field (its logarithm). Based on a variant of the positive energy theorem in General Relativity for the case of a closed universe, a strictly positive energy of space is introduced. The principle of minimum of the energy of space is proposed which determines a ground state as well as the excited states of the universe in quantum cosmology. According to this principle, the Beginning of the universe does exist as a state of minimal excitation of the energy of space. The initial proto-inflation quantum state of the universe is defined as a state of minimal excitation of the energy of space provided that the potential energy of the inflaton scalar field is large at the Beginning. Simultaneously, quanta of space energy excitation are introduced and the expansion of the universe can be considered as the birth of these quanta. Quantum birth of the ordinary matter becomes significant when the potential energy of the inflaton scalar field comes down to zero value.</p></div>","PeriodicalId":41808,"journal":{"name":"St Petersburg Polytechnic University Journal-Physics and Mathematics","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.spjpm.2017.05.008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85204570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dielectric properties and microstructure of the disintegrated nanogel films of bacterial cellulose 细菌纤维素纳米凝胶膜的介电性能和微观结构
IF 0.2
St Petersburg Polytechnic University Journal-Physics and Mathematics Pub Date : 2017-06-01 DOI: 10.1016/j.spjpm.2017.06.002
Albert K. Khripunov , Tamara P. Stepanova , Albina A. Tkachenko , Dmitriy P. Romanov , Ella P. Astapenko , Victoria M. Kapralova
{"title":"Dielectric properties and microstructure of the disintegrated nanogel films of bacterial cellulose","authors":"Albert K. Khripunov ,&nbsp;Tamara P. Stepanova ,&nbsp;Albina A. Tkachenko ,&nbsp;Dmitriy P. Romanov ,&nbsp;Ella P. Astapenko ,&nbsp;Victoria M. Kapralova","doi":"10.1016/j.spjpm.2017.06.002","DOIUrl":"10.1016/j.spjpm.2017.06.002","url":null,"abstract":"<div><p>The concentration dependencies of dielectric permittivity and dielectric loss factor have been studied for the water suspensions of nanogel films of bacterial cellulose Gluconacetobacter xylinus (BC) disintegrated with the blade rotation rates of 15,000 and 20,000<!--> <!-->rpm. The dipole moments of BC colloids have been evaluated using Buckingham's statistical theory of dielectric polarization modified for binary polar systems. The number of monomer units of cellobiose in the BC colloid being equal to 113, the volume and the characteristic rotation time of the colloid particles were calculated. The difference between the values of dielectric parameters for BC samples disintegrated at 15,000 and 20,000<!--> <!-->rpm were within experimental error. The constant stoichiometry of BC colloids and the identity of orientation ordering of microfibrills in colloids to that of the BC nanogel films have been shown by dielectric and X-ray studies.</p></div>","PeriodicalId":41808,"journal":{"name":"St Petersburg Polytechnic University Journal-Physics and Mathematics","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.spjpm.2017.06.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89080598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Identification procedure in the modal control of a distributed elastic system 分布式弹性系统模态控制的辨识方法
IF 0.2
St Petersburg Polytechnic University Journal-Physics and Mathematics Pub Date : 2017-06-01 DOI: 10.1016/j.spjpm.2017.06.004
Alexander K. Belyaev , Vladimir A. Polyanskiy , Nina A. Smirnova , Aleksandr V. Fedotov
{"title":"Identification procedure in the modal control of a distributed elastic system","authors":"Alexander K. Belyaev ,&nbsp;Vladimir A. Polyanskiy ,&nbsp;Nina A. Smirnova ,&nbsp;Aleksandr V. Fedotov","doi":"10.1016/j.spjpm.2017.06.004","DOIUrl":"10.1016/j.spjpm.2017.06.004","url":null,"abstract":"<div><p>It is necessary to provide the separation of the eigenmodes of elastic objects from the sensor signals and to make it possible to independently affect the modes with the use of actuators when realizing the modal system of controlling an elastic object with distributed parameters. The present paper puts forward an identification procedure which allows separating the vibration modes of the object in measured and control signals in the absence of the object model simulation. The control operability of this procedure was verified by experiment through making a system of active suppression of forced bending vibrations of a metal beam. The experiment showed the high control efficiency of the realized modal system.</p></div>","PeriodicalId":41808,"journal":{"name":"St Petersburg Polytechnic University Journal-Physics and Mathematics","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.spjpm.2017.06.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72374763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
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