scholarly journals Parametrical synthesis of radio devices with the set quantity of unequal cascades for variants of inclusion of jet two-port networks between a nonlinear part and loading

2021 ◽  
Vol 24 (3) ◽  
pp. 63-70
Author(s):  
Aleksandr A. Golovkov ◽  
Vladimir A. Golovkov ◽  
Aleksey V. Fomin

The algorithm of parametrical synthesis of various radio devices with any quantity of cascades of type a nonlinear part the jet two-port network by criterion of maintenance of the set frequency characteristics is developed. Nonlinear parts are presented in the form of a nonlinear element and parallel either consecutive on a current or pressure of a feedback. According to this criterion systems of the algebraic equations are generated and solved. Models of optimum two-port networks of one of cascades in the form of mathematical expressions for definition of interrelations between elements of their classical matrix of transfer and for search of dependences of resistance of two-poles from frequency are as a result received. It is spent mathematical and circuit simulation of the two-cascade amplifier. It is shown, that the increase in quantity of cascades with the optimised parametres leads to substantial growth of a working strip of frequencies. The comparative analysis of the theoretical results received by mathematical modelling in system MathCad, and the experimental results received by circuit simulation in systems OrCad and MicroCap, shows their satisfactory coincidence.

2021 ◽  
Vol 24 (3) ◽  
pp. 46-55
Author(s):  
Aleksandr A. Golovkov ◽  
Aleksey V. Fomin

The algorithm of parametrical synthesis of various radio devices with any quantity of cascades of type the jet two-port network a nonlinear part by criterion of maintenance of the set frequency characteristics is developed. Nonlinear parts are presented in the form of a nonlinear element and parallel either consecutive on a current or pressure of a feedback. According to this criterion systems of the algebraic equations are generated and solved. Models of optimum two-port networks in the form of mathematical expressions for definition of interrelations between elements of their classical matrix of transfer and for search of dependences of resistance of two-poles from frequency are as a result received. It is shown, that frequency characteristics of investigated radio devices from identical cascades are identical or similar to frequency characteristics of radio devices from one cascade, but with resistance of a source of a signal and the loading, changed definitely. Such schemes are named by equivalent. The comparative analysis of the theoretical results received by mathematical modelling in system MathCad, and the experimental results received by circuit simulation in systems OrCad and MicroCap, shows their satisfactory coincidence.


2000 ◽  
Vol 10 (03n04) ◽  
pp. 205-218 ◽  
Author(s):  
YAO-LIN JIANG ◽  
RICHARD M. M. CHEN

The multisplitting technique introduced by D. P. O'Leary and R. E. White is applied to treat the waveform relaxation solutions for systems of linear integral-differential-algebraic equations in circuit simulation. The convergence condition of the multisplitting waveform relaxation method which can contain overlapping is established for the continuous-time case. The convergence rates of the relaxation-based method for different multisplittings are compared from the view-point of spectral radii of splitting matrices in systems. Numerical experiments are provided to confirm the new theoretical results.


Respuestas ◽  
2020 ◽  
Vol 25 (1) ◽  
pp. 53-59
Author(s):  
Darby Páez - Amaya ◽  
Frederic Català - Castro ◽  
Martha Lucia Molina - Prado ◽  
Mario Montes-Usategui ◽  
Néstor Alonso Arias - Hernández

Optical tweezers use a highly-focused laser beam to capture and manipulate micro- and nanometric objects. These have been demonstrated to be a promising devices for state-of-the-art research in several fields, such as microbiology and biophysics. The prediction of the optical forces that are present in this phenomenon is a current problem in continuous evolution. Additionally, the recent use of vortex beams with exotic properties as the orbital angular momentum, with advantages as the rotational manipulation of the captured microparticles and reduction of the optical damage in biological samples (Opticution), makes the problem even more complex.  Mathematical expressions in the Rayleigh and Mie regimes for the radiation force on a dielectric sphere captured by TEM00 and TEM*01 mode beams are presented. Theoretical results are then compared with experimental measurements obtained with a direct force measurement device based on light-momentum detection.


Author(s):  
Rodrigo Azocar González

RESUMENEl presente artículo es fruto de una investigación de largo alcance que busca generar discusión en torno a los desafíos contemporáneos del Trabajo Social en la construcción de alternativas de intervención social en contextos de diversidad sexual en Chile. La crisis de la norma heterosexual refleja una contemporaneidad marcada por la visibilidad de los grupos históricamente excluidos, reflejo de la sensibilización y cuestionamiento de una masculinidad dominante intrínsecamente exclusora e inalcanzable, como también de procesos de posicionamiento político y cultural de un colectivo presente, pero hasta hace poco invisibilizado, en nuestro país. A través de técnicas etnográficas y la incorporación del concepto de mercado como vehículo de visibilidad, el trabajo propone ideas coherentes con la construcción de una praxis transdisciplinar que responde a la nueva definición de Trabajo Social, en discusión a nivel mundial, como de los procesos de cuestionamiento y mudanza ciudadanos revitalizados en la última década.Palabras clave: Intervención social, diversidad sexual, trabajo social, desafíos. Diversidade sexual e intervenção social: reflexões a partir do Trabalho SocialRESUMOO presente artigo é o resultado de uma pesquisa de longo alcance que procura gerar discussão em relação aos desafios contemporâneos do Trabalho Social na construção de alternativas de intervenção social em contextos de diversidade sexual no Chile. A crise da norma heterossexual reflete uma contemporaneidade marcada pela visibilidade dos grupos historicamente excluídos, reflexo da conscientização e questionamento de uma masculinidade dominante intrinsecamente que exclui e que se apresenta como inatingível, bem como processos de posicionamento político e cultural de um coletivo presente, mas até recentemente invisível em nosso país. Através de técnicas etnográficas e incorporação do conceito de mercado como veículo de visibilidade, o trabalho propõe ideias coerentes com a construçãode uma prática transdisciplinar que respondam à nova definição de TrabalhoSocial, discutido mundialmente, como dos processos de questionamento emudança cidadã revitalizados na última década.Palavras-chave: intervenção social, diversidade sexual, trabalho social,desafios. Sexual diversity and social intervention: Reflections fromsocial workABSTRACTThe current article is the result of a wider research that seeks to generatediscussion about the actual challenges of social work in the constructionof alternatives of social intervention on sexual diversity contexts in Chile.The crisis of the heterosexual regulation reflects a contemporaneity markedby the visibility of the historically excluded groups, as a reflection of thesensitivity and questioning of a dominant manhood inherently excluder andunreachable, as political and positioning processes of a current group, butuntil recently hidden in our country. Through ethnographic technics and theincorporation of the concept of market as a vehicle of visibility, this worksproposes ideas coherent with the construction of a cross-curricular praxisthat responds to the new definition of social work, globally discussed, as wellas the questioning processes and citizen movements during last decade.Keywords: Social intervention, sexual diversity, social work, challenges


Communicology ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 27-33
Author(s):  
N.V. Kirillina

The paper represents the analysis of the concept of communicative. The choice of topic is determined by the search for criteria and tools for assessing the results of strategic communication, taking into account the development of its interactive forms. The author leads the existing approaches to the definition of the concept of engagement and identifies the areas for further interdisciplinary research of the specified subject, and raises the issue of the appropriateness of using the engagement indicators in the assessment the social potential of communication. The work is based on the phenomenological tradition in the interpretation of communicative processes and the metamodel of communication of R. Craig. The author uses the methods of comparative analysis, analogy, generalization, and combined methodology of interdisciplinary analysis.


2003 ◽  
Vol 2003 (55) ◽  
pp. 3479-3501 ◽  
Author(s):  
C. Atindogbe ◽  
J.-P. Ezin ◽  
Joël Tossa

Let(M,g)be a smooth manifoldMendowed with a metricg. A large class of differential operators in differential geometry is intrinsically defined by means of the dual metricg∗on the dual bundleTM∗of 1-forms onM. If the metricgis (semi)-Riemannian, the metricg∗is just the inverse ofg. This paper studies the definition of the above-mentioned geometric differential operators in the case of manifolds endowed with degenerate metrics for whichg∗is not defined. We apply the theoretical results to Laplacian-type operator on a lightlike hypersurface to deduce a Takahashi-like theorem (Takahashi (1966)) for lightlike hypersurfaces in Lorentzian spaceℝ1n+2.


Author(s):  
Nikita K. Siundiukov ◽  

The article presents a comparative analysis of the theory of Ferdinand Tönnies “Gemeinschaft/Gesellschaft” and the philosophy of catholicity in the works of A.S. Khomyakov and I.V. Kireevsky. The theory of Tönnies is considered in the light of the concept of “sociological conservatism” manifested by A.F. Filippov. It is shown that the conceptual opposition “Gemeinschaft/Gesellschaft” can be seen continuation of the discussion about the “nature of the social”. In this light, the main reference points of Tönnies sociology are the political theories of Aris­totle and Hobbes, with an emphasis on the definition of the “natural state” of man. Based on the analysis of Tönnies theory, it is shown that its comparison with Slavophilism is possible in three parameters: appeal to the factor of sub­stantiality, the dichotomy of “historical” and “non – historical” and the use of the concept of “organic”. It is proved that in the context of a “conservative” reading of the philosophy of sobornost, its argumentation turns out to be mainly political and sociological


2015 ◽  
Vol 8 (1) ◽  
pp. 61-84
Author(s):  
David Koppitz ◽  
Milan Půček ◽  
František Ochrana ◽  
Michal Plaček

Abstract The paper aims to carry out a comparative analysis of heating of school facilities under the administration of municipalities in Macedonia, Moldova and Kosovo and to test the factors that affect the heating costs of school facilities. For a definition of the theoretical fundament parts of the theory of fiscal federalism are used. Subsequently five hypotheses are put forward that are verified using the method of benchmarking. The theoretical conclusions and recommendations may be used for a more effective implementation of public policies within the surveyed countries.


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