Relevant bibliographies by topics / Transmission problem

Academic literature on the topic 'Transmission problem'

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Published: 4 June 2021
Last updated: 14 September 2024

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Journal articles on the topic "Transmission problem"

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Alves, Margareth S., Jaime E. Muñoz Rivera, Mauricio Sepúlveda, and Octavio Vera Villagrán. "Transmission Problem in Thermoelasticity." Boundary Value Problems 2011 (2011): 1–33. http://dx.doi.org/10.1155/2011/190548.

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Anderson, J. Gerard. "Power line transmission problem." Physics Teacher 25, no. 7 (October 1987): 417. http://dx.doi.org/10.1119/1.2342297.

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Colton, David, Lassi Päivärinta, and John Sylvester. "The interior transmission problem." Inverse Problems & Imaging 1, no. 1 (2007): 13–28. http://dx.doi.org/10.3934/ipi.2007.1.13.

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Robinson, Enders A. "Inversion of a seismic transmission response." GEOPHYSICS 66, no. 4 (July 2001): 1235–39. http://dx.doi.org/10.1190/1.1487070.

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Traveling waves are used not only in exploration geophysics but also in other disciplines faced with remote detection problems. A physical system may be described in terms of the input (the source), the medium, and the output (the received signal). The received signal can be made up of either transmitted waves or reflected waves. Two types of inverse problems can be considered, namely, the inverse source problem and the inverse medium problem. In the inverse source problem, the objective is to determine the source. In the inverse medium problem, the objective is to determine the medium. Thus, in terms of this general classification, four types of problems can be encountered, namely, an inverse source problem with transmitted waves, an inverse source problem with reflected waves, an inverse medium problem with transmitted waves, and an inverse medium problem with reflected waves. Let us look at nature. Twinkle, twinkle, little star. The transmission of starlight though the atmosphere makes the star twinkle. A better image of the star can be obtained by solving an inverse source problem using the transmitted starlight. In the typical inverse source problem, the source of energy is remote, the medium transmits the source signal, and the received data are the transmitted waves. Examples are classical earthquake seismology, radio transmission, and passive sonar. Shakespeare said; “For the eye sees not by itself, but by reflection.” Thus the miracle of eyesight solves an inverse medium problem that uses reflected waves. In the typical inverse medium problem, the source of energy is local and often man‐made, the medium reflects the source signal, and the received data are the reflected waves. Examples are reflection seismology, radar, and active sonar. Thus, the two principle types of inverse problems encountered in nature are the inverse source problem with transmitted waves and the inverse medium problem with reflected waves.
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Cakoni, Fioralba, David Colton, and Drossos Gintides. "The Interior Transmission Eigenvalue Problem." SIAM Journal on Mathematical Analysis 42, no. 6 (January 2010): 2912–21. http://dx.doi.org/10.1137/100793542.

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Yan, Guozheng. "Inverse scattering for transmission problem." Computers & Mathematics with Applications 44, no. 3-4 (August 2002): 439–44. http://dx.doi.org/10.1016/s0898-1221(02)00160-8.

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Medková, Dagmar. "Solution of the Transmission Problem." Acta Applicandae Mathematicae 110, no. 3 (June 6, 2009): 1489–500. http://dx.doi.org/10.1007/s10440-009-9522-5.

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Cakoni, Fioralba, David Colton, and Jacob D. Rezac. "The Born transmission eigenvalue problem." Inverse Problems 32, no. 10 (September 12, 2016): 105014. http://dx.doi.org/10.1088/0266-5611/32/10/105014.

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Ola, P. "Remarks on a Transmission Problem." Journal of Mathematical Analysis and Applications 196, no. 2 (December 1995): 639–58. http://dx.doi.org/10.1006/jmaa.1995.1431.

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Julia, Orlik. "Transmission problem for viscoelastic aging." ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik 80, S2 (2000): 405–6. http://dx.doi.org/10.1002/zamm.20000801474.

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Dissertations / Theses on the topic "Transmission problem"

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Ali, Habib K. "Mathematical modelling of the optimal power dispatch problem." Thesis, University of Strathclyde, 1990. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21285.

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This thesis is concerned with the optimum operating conditions in a power system. The various aspects of the problem are modelled and solved as a number of optimization problems applying linear programming techniques. A generalized linear mathematical model has been developed for this purpose. A two-stage formulation is adopted to represent the various problems considered. In each case one power system quantity is chosen as an objective function to be optimized under a number of constraints and operating limits relating to the power system relationships and upper and lower bounds on the variables. These include constraints derived from the power flow equations and transmission network capacity. Limits are also imposed on bus voltage magnitudes and generator outputs. With the appropriate selection of the combination of objective function and constraints, the model can be used to minimize the overall generation cost, the total system losses or the total reactive power generation. The two-stage modelling of the problem also allows optimizing two different objective functions at the same time. Two such combinations are possible. In one case the total system losses can be minimized in the first stage and the generation cost minimized in the second stage. The other combination minimizes the total system reactive power output and the active power generation cost. Using the same model, the problem is then solved using decomposition techniques. These imply breaking up the original problem into a number of smaller problems that can be solved almost independently. The mathematical model has been developed in general terms and the associated computer program is written for a general power system. A sample system of medium size has been used to test the validity of the various aspects of the suggested model and produce numerical results.
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Smith, William Corbett. "Production costing with transmission constraints." Ohio : Ohio University, 1989. http://www.ohiolink.edu/etd/view.cgi?ohiou1182517746.

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PEREIRA, FELIPE ERNESTO LAMM. "TRANSMISSION CONGESTION ANALYSIS APPLIED ON VOLTAGE SECURITY REINFORCEMENT PROBLEM." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2003. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=3953@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
Após a incidência de inúmeros colapsos ocorridos nos sistemas de transmissão de energia devido ao uso extremo das linhas de transmissão, a estabilidade, ou mais adequadamente, a segurança de tensão tornou-se um assunto importante ao longo dos últimos anos. Este trabalho foi desenvolvido com o intuito de complementar um método de reforço das condições de estabilidade de tensão. O método consta de ações de controle para diminuir o fluxo de potência ativa no ramo crítico do caminho de transmissão mais carregado associado a uma barra crítica, conceitos estes apresentados nesta dissertação. Para o propósito citado, e considerando que o problema de estabilidade de tensão causa restrições nos fluxos de potência na rede de transmissão, são estudados métodos que analisam o congestionamento dessas redes. Se destacam algoritmos que, a partir dos fluxos de potência ativa e reativa que deixam um gerador, ou que chegam a uma carga, determinam a distribuição nos ramos de um sistema de transmissão, e o algoritmo que avalia os impactos no sistema de transmissão devido a uma determinada transação, entre barras geradoras e/ou de cargas. São mostrados exemplos numéricos que ilustram a possibilidade ou não da adequação destes métodos para o problema do reforço das condições de segurança de tensão.
After a number of collapses due to the extreme use of the transmission lines, the voltage stability, or voltage security, became an important issue. This work was developed in order to contribute to a voltage security reinforcement method. The method calculates control actions to decrease the power flowing through the critical branch of the most loaded transmission path associated with the critical bus (concepts present in this dissertation). For this propose, and considering that the power flow in a transmission network may be restricted by voltage stability limits, transmission congestion analysis methods were study. Two of them deal with the contribution of real and reactive outflows of individual generator buses, and real and reactive inflows of individual load buses, in all network branches. Another method assess the impact of a given power transaction on the network. Numerical examples are presented to illustrate whether it is the possible or not to employ the studied methods in the voltage security reinforcement problem.
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Wasyk, Rebecca Dawn. "Numerical Solution of a Transmission Problem with Prefractal Interface." Digital WPI, 2007. https://digitalcommons.wpi.edu/etd-dissertations/407.

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"Certain physical problems in electrostatics, magnetostatics, and heat transfer give rise to elliptic boundary value problems with transmission conditions on a layer. We focus on a particular problem with a second order transmission condition, representing an infinitely conductive layer. To approximate irregular layers that may naturally arise, a sequence of layers that converge to the fractal von Koch curve is considered. The solution to this transmission problem with a prefractal layer exhibits singularities due to the transmission condition across the layer as well as the reentrant corners introduced in the domain by the prefractal curve. To solve this problem numerically using a finite element method, the mesh must be adjusted to account for these singularities. We exhibit a general algorithm for creating a finite element discretization of the domain that results in linear convergence of the numerical solution to the true solution in a suitable norm."
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Peabody, Alan Bowe. "Applying shock damping to the problem of transmission line cascades." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=84308.

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Early in the 20th Century, the design and construction of high-voltage overhead electric power lines began. In the nearly 100 years since those first lines were built, the progressive collapse of large numbers of structures has been a continuing problem. These large progressive collapses are known today as cascades.
While not all structural failures result in cascades, longitudinal cascades begin with a failure in the structural system that maintains tension in the overhead wires. These failures are represented most simply by a broken wire. Broken wires cause dynamic loads on the towers much higher than the intact wire tensions.
This research tests the hypothesis that adding supplemental springs and mechanical dampers to electric transmission towers can help control the dynamic forces on towers that lead to cascades. Two new methods of incorporating springs and dampers into towers were invented: the "post spring-damper" and the "rotating crossarm spring-damper." A case study modeling a typical 230 kV line using the finite element dynamics program ADINA (ADINA 2003) was used to test these two new methods.
Both the post spring-damper and the rotating crossarm spring-damper proved to be effective. They substantially reduce the peak dynamic loads while dissipating a large fraction of the total energy released by broken wires.
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Cossonnière, Anne. "Valeurs propres de transmission et leur utilisation dans l'identification d'inclusions à partir de mesures électromagnétiques." Thesis, Toulouse, INSA, 2011. http://www.theses.fr/2011ISAT0011/document.

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La théorie des problèmes de diffraction inverses pour les ondes acoustiques et électromagnétiques est un domaine de recherche très actif qui a connu des avancées significatives ces dernières années. La Linear Sampling Method (LSM), permettant de reconstituer la forme d’un objet à partir de sa réponse acoustique ou électromagnétique avec peu de données a priori sur les propriétés physiques de l’objet, a révélé l’existence de fréquences de résonance appelées valeurs propres de transmission, pour lesquelles cette méthode échoue dans le cas d’objets diffractants pénétrables. Ces fréquences particulières peuvent être étudiées à partir d’un nouveau type de problème appelé problème de transmission intérieur. Ces valeurs propres s’avèrent utiles dans le problème d’identification puisqu’elles peuvent aussi être calculées à partir des mesures à l’infini et quelles apportent des informations qualitatives sur les propriétés physiques de l’objet. Dans cette thèse, nous prouvons l’existence et le caractère discret de l’ensemble des valeurs propres de transmission pour deux nouvelles configurations, correspondant aux cas où l’objet diffractant pénétrable contient une cavité ou un conducteur parfait. De plus, nous proposons une nouvelle approche utilisant les équations intégrales permettant de calculer numériquement les valeurs propres de transmission
The theory of inverse scattering for acoustic or electromagnetic waves is an active area of research with significant developments in the past few years. The Linear Sampling Method (LSM) is a method that allows the reconstruction of the shape of an object from its acoustic or electromagnetic response with a few a priori knowledge on the physical properties of the scatterer. However, this method fails for resonance frequencies called transmission eigenvalues in the case of penetrable objects. These transmission eigenvalues are the eigenvalues of a new type of problem called the interior transmission problem. Their main feature is that not only they can give information on the physical properties of the scatterer but they can also be computed from far field measurements. In this thesis, we prove the existence and the discreteness of the set of transmission eigenvalues for two new configurations corresponding to the cases of a scatterer containing a cavity or a perfect conductor. A new approach using surface integral equations is also developed to compute numerically transmission eigenvalues for general geometries
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Escobar, Vargas Laura Mónica. "Specialized models for the long-term transmission network expansion planning problem /." Ilha Solteira, 2018. http://hdl.handle.net/11449/180548.

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Orientador: Rubén Augusto Romero Lázaro
Resumo: A análise de sistemas altamente complexos quando e analizado o problema de planejamento de expansão de redes de transmissão de longo prazo, é o foco principal deste trabalho. Os modelos e metodos propostos são aplicados ao problema de planejamento estático tradicional, que é um problema de otimização matemática classificado como NP-completo, não-linear inteiro misto. O qual envolve no investimento, variáveis operacionais contínuas e variáveis inteiras. O comportamento normal de cada sistema pode conter informação essencial para a criação de novos métodos, como os planos de corte baseados em cortes de diferença de ângulos para problemas de grande escala, o que é a base é o ponto de partida deste trabalho, derivando em desigualdades válidas é ciclos críticos. Os cortes angulares básicos reduzem o espaço de busca do problema e o tempo total de cálculo deste problema, enquanto ao método de inequações válidas que pode ser usado para fornecer limites inferiores sólidos no investimento ótimo do planejamento de transmissão, já que a diferença entre o modelo DC (modelo exato) e o modelo de transporte (modelo mais relaxado) são as restrições angulares. Os ciclos críticos têm sido desenvolvidos para melhoraralguns dos modelos tradicionais do problemas de planejamento da expansão da rede de transmissão de longo prazo. A razão por trás disso é a ausência da segunda lei de Kirchhoff, que completa a representação do sistema, mas aumenta a complexidade. Para resolver os problemas resultantes... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The analysis of highly complex systems when solving the long-term transmission network expansion planning problem is the main focus of this work. The proposed improved models and methodology are applied to the traditionalstatic planning problem, which is a mathematical optimization problem classified as NP-complete and mixed-integer nonlinear problem. It involves continuousoperating variables and integer investment variables. The normal behavior of each system can be shown essential information to the creation of new methods, as the cutting-planes based in bus-angle difference cuts for large-scale problems which were the starting point of this work, deriving in valid inequalities and critic cycles. The angular cuts aim to reduce the search space of the problem and the total computation time of this NP-hard problem as for the valid inequalities methodthat can be used to provide strong lower bounds on the optimal investment of the transmissionplanning, since the difference between the DC model (exact model) and the transport model (more relaxed model) are the angular constraints. Critic cycles has been develop in order to improve some of the traditional long-term transmission network expansion planning problem models. The reason behind it is the absence of second Kirchhoff’s law which completes the representationof the system, but increase the complexity. In order to solve the resulting problems, this work uses the modeling language AMPL with the solver CPLEX. In test systems w... (Complete abstract click electronic access below)
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Al-awaji, Saleh Hussein. "Investigation and comparison of solution methods of the unit commitment problem for thermal units." Thesis, University of Strathclyde, 1990. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21293.

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This thesis deals with a general investigation and comparison of methods of solution of the unit commitment problem for thermal generating units. An intensive mathematical model for this problem has been developed and presented. The most commonly implemented methods for solving the problem of unit commitment were reviewed and discussed. Every reviewed method had been coded in FORTRAN 77 on a VAX11/785 machine. On the basis of the results obtained, a comprehensive comparison of the different methods ha; been carried out. For the comparison to be realistic and practical, each method was tested on three power systems of different sizes. As a result of the comparison, the unit commitment problem for a case study system has been solved by using the most appropriate method(s) from those discussed in the thesis. A new approach for solving the problem has also been proposed and tested.
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Roberts, T. Dale (Terrance Dale) Carleton University Dissertation Computer Science. "Learning automata solutions to the capacity assignment problem." Ottawa, 1997.

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Tomiyama, Elias Kento 1981. "Estudo do aspecto locacional da alocação de custos da transmissão = Study of the locational aspect in the transmission cost allocation problem." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/262018.

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Orientador: Carlos Alberto de Castro Júnior
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
Made available in DSpace on 2018-08-21T03:54:49Z (GMT). No. of bitstreams: 1 Tomiyama_EliasKento_M.pdf: 3080864 bytes, checksum: 7293fe7b3271c5c27e9b967c48a4e245 (MD5) Previous issue date: 2012
Resumo: Esta dissertação de mestrado apresenta quatro metodologias de alocação de custos da transmissão: Pro rata (PR), Divisão Proporcional (PS), Zbus-médio (Zbus_AVG) e Nodal. Enquanto a primeira desconsidera o aspecto locacional e aloca os custos baseado apenas na quantidade de potência produzida pelos geradores e consumida pelas cargas, as últimas três levam em conta este aspecto, ou seja, as tarifas pagas por geradores e cargas dependem do seu ponto de conexão na rede elétrica. Através de simulações computacionais são levantadas várias situações de operação no sentido de avaliar a influência e as possíveis implicações de ordem regulatória, política, econômica e social de um país provocadas pela inclusão do aspecto locacional na definição das tarifas de uso do sistema de transmissão. Por fim, mostra-se a possibilidade de se considerar as tarifas pagas pelos agentes do sistema como um critério de decisão a mais no problema do planejamento da expansão da transmissão
Abstract: This dissertation describes four transmission cost allocation methodologies: Pro rata (PR), Proportional sharing (PS), Zbus-average (Zbus_AVG) and Nodal. While the first one disregards the locational aspect and allocates costs based only on the amount of power delivered by generators and consumed by loads, the last three ones take this aspect into account, i.e. charges are dependent on where generators and demands are connected in the network. Several computer simulations were made in order to assess the influence of the locational aspect into transmission pricing scheme and the results were used for a critical analysis, including political, regulatory, economic and social aspects. Finally, we discuss the possibility of using the fees paid by transmission system agents as an additional criterion for the Transmission Expansion Planning problem
Mestrado
Energia Eletrica
Mestre em Engenharia Elétrica
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Books on the topic "Transmission problem"

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Jorge, Kubie, and Grassie Thomas, eds. Heat transfer: A problem solving approach. New York: Taylor & Francis, 2003.

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Rendtorff, Rolf. The problem of the process of transmission in the Pentateuch. Sheffield: JSOT, 1990.

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Association, Research and Education, ed. The Heat transfer problem solver: A complete solution guide to any textbook. New York: The Association, 1991.

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Gaver, Donald Paul. A resource conflict resolution problem formulated in continuous time. Monterey, Calif: Naval Postgraduate School, 1985.

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Wiwanitkit, Viroj. Traffic and industrial environmental problem: New concern for developing countries. New York: Nova Science, 2009.

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Lachman, Sydney J. Heterosexual HIV/AIDS as a global problem-- towards 2000: An updated guide for all medical practitioners and healthcare workers. Houghton: J.B. Israelsohn, Pharmaceutical Society of South Africa, Southern Gauteng Branch, 1997.

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W, Hobbs Linn, Westmacott K. H, Williams David B. 1949-, and Materials Research Society, eds. Materials problem solving with the transmission electron microscope: Symposium held December 2-4, 1985, Boston, Massachusetts, U.S.A. Pittsburgh, Pa: Materials Research Society, 1986.

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B.C. Hydro. Property Services Dept. and B.C. Hydro. Gas System Operations Dept., eds. What happened to our right of way?: A report on the encroachment problem within B. C. Hydro's gas transmission rights of way. [Vancouver]: B.C. Hydro, 1985.

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Ruegg, David Seyfort. Buddha-nature, mind, and the problem of gradualism in a comparative perspective: On the transmission and reception of Buddhism in India and Tibet. New Delhi, India: Heritage Publishers in arrangement with School of Oriental and African Studies, London, 1992.

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Hromkovič, Juraj. Algorithmics for Hard Problems: Introduction to Combinatorial Optimization, Randomization, Approximation, and Heuristics. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004.

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Book chapters on the topic "Transmission problem"

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Ammari, Habib, and Hyeonbae Kang. "2. Transmission Problem." In Reconstruction of Small Inhomogeneities from Boundary Measurements, 11–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-44501-2_3.

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Thomson, Gavin R., and Christian Constanda. "The Transmission Problem." In Stationary Oscillations of Elastic Plates, 177–90. Boston: Birkhäuser Boston, 2011. http://dx.doi.org/10.1007/978-0-8176-8241-5_10.

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Ammari, Habib, and Hyeonbae Kang. "6. Transmission Problem for Elastostatics." In Reconstruction of Small Inhomogeneities from Boundary Measurements, 109–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-44501-2_8.

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Labov, William. "The Transmission Problem in Linguistic Change." In The New Sociolinguistics Reader, 66–74. London: Macmillan Education UK, 2009. http://dx.doi.org/10.1007/978-1-349-92299-4_5.

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Cakoni, Fioralba, and Houssem Haddar. "Interior Transmission Problem for Anisotropic Media." In Mathematical and Numerical Aspects of Wave Propagation WAVES 2003, 613–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55856-6_99.

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Potomkin, Mykhailo. "Asymptotic Behavior of Nonlinear Transmission Plate Problem." In IFIP Advances in Information and Communication Technology, 521–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-36062-6_52.

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Judge, David. "The ‘Problem’ of Representational Transmission of Power." In Democratic Incongruities, 47–76. London: Palgrave Macmillan UK, 2014. http://dx.doi.org/10.1057/9781137317292_3.

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Bhowmick, Suman. "Introduction to the Newton—Raphson Method and the Power Flow Problem." In Flexible AC Transmission Systems (FACTS), 33–61. Boca Raton: Taylor & Francis, 2016.: CRC Press, 2018. http://dx.doi.org/10.1201/9781315222431-2.

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Georgilakis, Pavlos S. "Differential Evolution Solution to Transmission Expansion Planning Problem." In Energy Systems, 409–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02493-1_18.

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Jovanović, Boško S. "Finite Difference Approximation of a Hyperbolic Transmission Problem." In Approximation and Computation, 327–37. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-6594-3_21.

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Conference papers on the topic "Transmission problem"

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CAKONI, F., D. COLTON, and D. GINTIDES. "THE TRANSMISSION EIGENVALUE PROBLEM." In Proceedings of the 9th International Workshop on Mathematical Methods in Scattering Theory and Biomedical Engineering. WORLD SCIENTIFIC, 2010. http://dx.doi.org/10.1142/9789814322034_0038.

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Alexandrova, Irina L., and Nikolai B. Pleshchinskii. "Scanning periodic grating: Diffraction problem and transmission problem." In Days on Diffraction 2012 (DD). IEEE, 2012. http://dx.doi.org/10.1109/dd.2012.6402743.

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Wang, Da-Wei, and Lenore Zuck. "Real-time sequence transmission problem." In the tenth annual ACM symposium. New York, New York, USA: ACM Press, 1991. http://dx.doi.org/10.1145/112600.112611.

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Lomuscio, Alessio, and Marek Sergot. "The bit transmission problem revisited." In the first international joint conference. New York, New York, USA: ACM Press, 2002. http://dx.doi.org/10.1145/544862.544961.

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Grastien, Alban, Ignaz Rutter, Dorothea Wagner, Franziska Wegner, and Matthias Wolf. "The Maximum Transmission Switching Flow Problem." In e-Energy '18: The Ninth International Conference on Future Energy Systems. New York, NY, USA: ACM, 2018. http://dx.doi.org/10.1145/3208903.3208910.

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Wang, Da-Wei, and L. D. Zuck. "Tight bounds for the sequence transmission problem." In the eighth annual ACM Symposium. New York, New York, USA: ACM Press, 1989. http://dx.doi.org/10.1145/72981.72986.

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Sokolova, O. D., A. N. Yurgenson, and V. V. Shakhov. "Data transmission problem for modern data networks." In 2014 12th International Conference on Actual Problems of Electronics Instrument Engineering (APEIE). IEEE, 2014. http://dx.doi.org/10.1109/apeie.2014.7040769.

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Xiong, Wei, Haiyu Huang, Baofeng Jiang, Tao Ding, Yang Xiao, and Xiaosheng Zhang. "Redundant Transmission Constraints Identification and Elimination for Transmission-constrained Unit Commitment Problem." In 2023 3rd International Conference on Energy Engineering and Power Systems (EEPS). IEEE, 2023. http://dx.doi.org/10.1109/eeps58791.2023.10256835.

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Skobtsov, Yu A. "AN EVOLUTIONARY APPROACH TO PROBLEM SOLVING OF PRODUCTION SCHEDULING." In PROCESSING, TRANSMISSION AND PROTECTION OF INFORMATION IN COMPUTER SYSTEMS. St. Petersburg State University of Aerospace Instrumentation, 2020. http://dx.doi.org/10.31799/978-5-8088-1452-3-2020-1-95-102.

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Lopez, Julio Cesar, J. R. S. Mantovani, and Javier Contreras Sanz. "Var planning problem considering conditional value-at-risk assessment." In 2014 IEEE/PES Transmission & Distribution Conference & Exposition (T&D). IEEE, 2014. http://dx.doi.org/10.1109/tdc.2014.6863472.

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Reports on the topic "Transmission problem"

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Baldick, R., and E. Kahn. The transmission interface constraint problem. Office of Scientific and Technical Information (OSTI), October 1993. http://dx.doi.org/10.2172/10105722.

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Baldick, R., and E. Kahn. The transmission interface constraint problem. Revision. Office of Scientific and Technical Information (OSTI), October 1994. http://dx.doi.org/10.2172/109686.

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Білоконенко, Л. А. Semantic integrity of overtext of conflict. Vědecko vydavatelské centrum «Sociosféra-CZ», 2014. http://dx.doi.org/10.31812/0564/1811.

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The article describes the problem of internal area of overtext of conflict. The author analyzes one of the most important qualities of overtext –semantic integrity, that exists because of its ability to coordinate with the extra- textual world, situations and events; transmission of speech actions of people at different stages of the conflict using confrontational tactics and activating in the language semantics specific fragment culture – conflict.
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Malik. L51877 Crack Arrest Toughness to Avoid Dynamic Ductile Fracture in Gas Transmission Pipelines. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), March 2001. http://dx.doi.org/10.55274/r0010192.

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Design against long ductile fracture propagation in gas pipelines involves an analysis of the balance between driving force, derived from the gas pressure, and the fracture resistance of the material. Initially, the shelf energy in the Charpy test was successfully used as a measure of fracture propagation resistance. As material strength, pipe diameter and operating pressures increased and required greater fracture propagation resistance, the limitations of the Charpy energy approach became increasingly apparent. This limitation for modern steels is due to the fact that the Charpy test involves significant energy absorption contributions from processes not related to fracture propagation. If an energy-balance approach is to be maintained, and if material resistance is to be measured in a fairly simple laboratory notch bend test (e.g. Charpy or drop-weight tear), the problem reduces to the isolation of the propagation energy absorption per unit of crack advance. To resolve crack propagation energy, a novel modification was evaluated for both Charpy and DWTT specimens by employing a back-slot including a snug fitting shim to replace the removed material. In most cases, this modification was effective in curtailing the load-displacement trace when the propagating crack interacted with the slot on the backside of the specimen. It is also noted that this approach did not affect the initial portion of the load-displacement history and thus allowed crack propagation energies to be resolved.
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Nestleroth and Alers. L51946 Enhanced Implementation of MFL Using EMAT Sensors to Detect External Coating Disbondment. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), December 2002. http://dx.doi.org/10.55274/r0010676.

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External coatings are used routinely to protect transmission pipelines from conditions that promote corrosion. However, over time coatings may disbond, allowing corrosion to occur. To detect metal loss due to corrosion defects, transmission pipeline operators often use magnetic flux leakage (MFL) in-line inspection tools. These tools do not detect the cause of an actual problem, i.e., failure of a coating and the presence of a corrosive environment; rather, they detect only the result, i.e., a defect that may permanently alter the pressure capacity of the pipeline. Metal loss is the most common defect that occurs at a disbond; however, it is not the only defect that can occur. Stress corrosion cracking (SCC) almost always occurs at disbonds. Information about disbonded and missing coatings, soil models, cathodic protection assessment, and related data could be used to assess a pipeline for the potential of cracking. Direct inspection of the coating could indicate potential problems that could lead to pipeline degradation that affects serviceability. SCC can be detected using in-line inspection technology, but such tools have a limited availability and limited success in natural gas pipelines, and the cost of inspection is high compared to MFL inspection. A novel method for the in-line evaluation of a protective coating on a pipeline was shown to be feasible. The method involves the merging of two technologies, magnetic flux leakage (MFL) and electromagnetic acoustic transducers (EMATs). The results of the testing performed at the Pipeline Simulation Facility showed three technical accomplishments. First, EMATs could be designed to work with the magnetic fields produced by an MFL tool, although fields 2 to 3 times greater are usually optimal for EMAT sensors. Second, the EMAT transmitter and receiver could be mounted on an MFL inspection tool without interfering with the corrosion detection sensors. Finally, the EMAT sensors as implemented on the MFL pig could detect missing coating and disbonds on wrapped tar coating. While technical issues remain that would broaden the applicability, the immediate implementation of this technology for specific coating problems is possible.
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Nestleroth. L52298 Augmenting MFL Tools With Sensors that Assess Coating Condition. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), March 2009. http://dx.doi.org/10.55274/r0010396.

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External coatings are routinely used to protect transmission pipelines from corrosion; however, coatings may degrade or disbond over time enabling corrosion to occur. Transmission pipeline operators often use magnetic flux leakage (MFL) in-line inspection tools to detect metal loss corrosion defects. Rather than finding the cause of a problem, failure of the coating within a corrosive environment, MFL corrosion surveys only find the result of the problem, corrosion defects that may permanently alter the pressure carrying capacity of the pipeline. Stress corrosion cracking (SCC) can be detected using in-line inspection (ILI) technology, but the availability of tools is limited and the cost of inspection is high compared to MFL inspection. SCC almost always occurs at coating faults; direct coating assessment could indicate future problems that could degrade the serviceability of the pipeline. In this project, a new sensor was developed to assess external coating that could work with currently available ILI tools for minimal additional cost to perform the inspection. The sensors, electromagnetic acoustic transducers (EMATs), generate ultrasonic waves that are guided by the pipe material around the circumference of the pipe. The coating material and adherence can influence the propagation of the ultrasonic waves; changes in ultrasonic signal features were attributed to coating faults. This development used modeling and experiments to establish a more optimal configuration for coating assessment. A multiple feature approach was used. A commonly used feature, signal amplitude, provided good sensitivity to coating condition but was influenced by inspection variables. One unique feature identified in this development is arrival time of the ultrasonic wave. For the wave type and frequency selected, the wave velocity was different for bare and coated pipe. Therefore, disbonded or missing coating can be detected by monitoring arrival time of the ultrasonic wave, a feature that is amplitude independent. Another feature for assessing coating, absorption of selective frequencies, was also demonstrated. Coating assessment capability was experimentally demonstrated using a prototype EMAT ILI tool. All three detection features were shown to perform well in an ILI environment as demonstrated at Battelle"s Pipeline Simulation Facility and BJ Inspection Services pull rigs. Improvement to the prototype occurred between each test; the most significant improvement was the design and construction of a novel set of thick-trace transmitting and receiving Printed Circuit Board (PCB) EMAT coils. Implementation variables such as moisture and soil loading were shown to have a minimal influence on results.
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Way, L., S. West, B. Swift, L. Whatford, and C. Rymer. Learnings from the pilot Citizen Science and AMR project. Food Standards Agency, November 2023. http://dx.doi.org/10.46756/sci.fsa.axj107.

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Antimicrobial resistance (AMR) is a global societal challenge which can be characterised as a ‘One Health’ problem as it has implications not only for human health but also that of animals, the environment and, ultimately, the economy. Despite the significance of this threat, there remain substantial knowledge gaps in relation to transmission pathways for AMR within the food system, and home-growing is a particularly understudied space. Citizen Science and Antimicrobial Resistance (CSAMR) was a pilot project designed to collate data on the cultivation and food preparation practices of home-growers which could enrich existing knowledge on how AMR bacteria move through the food system. CSAMR sought equally to prove the efficacy of citizen science methodology to contribute to the evidence base in this research area.
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Cao Romero, Julio A., Jorge Reyes-Avendaño, Julio Soriano, Leonardo Farfan-Cabrera, and Ali Erdemir. A Pin-on-Disc Study on the Electrified Sliding Wear of EVs Powertrain Gears. SAE International, March 2022. http://dx.doi.org/10.4271/2022-01-0320.

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In contrast to conventional powertrains from internal combustion engine vehicles (ICEV), the tribological performance of powertrains of electric vehicles (EVs) must be further evaluated by considering new critical operating conditions such as electrical environments. The operation of any type of electric motor produces shaft voltages and currents due to various hardware configurations and factors. Furthermore, the common application of inverters intensifies this problem. It has been reported that the induced shaft voltages and currents can cause premature failure problems in tribological components such as bearings and gears due to accelerated wear and/or fatigue. It is ascribed to effects of electric discharge machining (EDM), also named, sparking wear caused by shaft currents and poor or increasingly diminishing dielectric strength of lubricants. A great effort has been done to study this problem in bearings, but it has not yet been the case for gears. Considering that EVs powertrains can be configurated with an electric motor coupled to a single-speed or multi-speed transmission, it is expected that shaft currents can also affect gears to some extent. The pin-on-disc test has been widely used to study sliding wear of gear materials under comparable or realistic operating conditions. This accelerated test is effective for screening materials, lubricants and operating conditions allowing evaluations of their friction and wear properties. However, it has not been implemented for studying gear materials under electrified environments. Thus, this paper aims to explore the friction coefficient and wear of gear materials under non-electrified and electrified sliding in a pin-on-disc tester applying typical of EVs powertrain shaft currents during sliding. The tests were carried out at two different DC currents under comparable gear dry and lubricated sliding contact conditions. Friction coefficient, wear volumes and morphologies were evaluated and reported in this work.
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Meloy, John D. L51702 Precision Gas Pipeline Location-A Technology Study. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), January 1994. http://dx.doi.org/10.55274/r0010417.

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A review of currently used pipe-locating techniques and technologies shows a universally conservative approach to system design. Tested and proven sensors and data processors have been integrated into systems that optimize performance specifically for the pipeline-location problem. Although these systems perform well, they could be improved and augmented (that is, performance could be enhanced) by incorporating a broader sensor mix. Emerging technologies also hold promise for upgrading performance by improving, rather than changing the basic sensors. This study was undertaken to survey and evaluate the technology available to determine accurately the position of submerged or buried gas transmission pipelines, and to assess the applicability of some of the emerging technologies. The objectives are to increase accuracy and reliability while reducing the cost of surveys. This report is organized to provide an overview of the elements applicable to the problem of pipe detection, identification, and location. These elements include basic sensors and pipe-location systems made up of sensors, computers, peripherals, and data links. The report includes a qualitative comparison of both sensors and systems using a number of performance criteria. A brief description of relevant technologies that have been developed for uses other than pipeline location, as well as new and emerging technologies, is also included.
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Seamans, Thomas, and Allen Gosser. Bird dispersal techniques. U.S. Department of Agriculture, Animal and Plant Health Inspection Service, August 2016. http://dx.doi.org/10.32747/2016.7207730.ws.

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Conflicts between humans and birds likely have existed since agricultural practices began. Paintings from ancient Greek, Egyptian, and Roman civilizations depict birds attacking crops. In Great Britain, recording of efforts at reducing bird damage began in the 1400s, with books on bird control written in the 1600s. Even so, the problem persists. Avian damage to crops remains an issue today, but we also are concerned with damage to homes, businesses, and aircraft, and the possibility of disease transmission from birds to humans or livestock. Bird dispersal techniques are a vital part of safely and efficiently reducing bird conflicts with humans. The bird must perceive a technique as a threat if it is to be effective. No single technique can solve all bird conflicts, but an integrated use of multiple techniques, each enhancing the other, generally provides relief.
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