Analysis of Implementation Methodologies of Deadbeat Direct-Torque and Flux Control (DB-DTFC) for IPMSMs in Stationary and Rotatory Reference Frames

Deadbeat-control is a well-established control technique that uses the inverse machine model to determine the voltage commands required to achieve the desired torque and flux commands. Its classic implementation requires solving a quadratic equation with an extensive number of terms. Moreover, it can be only solved in the dq-reference frame. In this paper, two novel implementations are presented. The first methodology, in the dq-reference frame, reduces the algorithm's complexity and computation time. Moreover, it is immune to estimation errors of the permanent magnet flux. A second methodology based on the flux vector orientation is also presented. As opposed to the classic implementation, the proposed method does not require solving a quadratic equation; this reduces its complexity and computation time. Furthermore, the proposed methodology can be solved both in the dq and aß frames since it relies only on the stator flux's magnitude and angle. Up to date and to the best of the author's knowledge, DB-DTFC in the stationary frame has not been presented before for salient machines. DB-DTFC in the stationary frame reduces the reliance on the position observer and facilitates the implementation of overmodulation techniques and six-step operation. The proposed methodology can operate in the MTPF line without any adjustments and it shows an adequate dynamic performance. Simulation and experimental results validate the methodologies. Caveats regarding their implementation are also discussed

Belief heterogeneity and survival in incomplete markets

In complete markets economies (Sandroni [16]), or in economies with Pareto optimal outcomes (Blume and Easley [10]), the market selection hypothesis holds, as long as traders have identical discount factors. Traders who survive must have beliefs that merge with the truth. We show that in incomplete markets, regardless of traders’ discount factors, the market selects for a range of beliefs, at least some of which do not merge with the truth. We also show that impatient traders with incorrect beliefs can survive and that these incorrect beliefs impact prices. These beliefs may be chosen so that they are far from the truth

Fish and Feminists

Summary Despite apparent acceptance of gender analysis within development organizations, this is still only rarely translated into gender?sensitive practice. The language of gender and development is adopted, but is accompanied by a subtle shift into ‘projects for women’. The article considers the problem through a case study of a programme in one international development organization – the FAO. The programme promotes small scale fish farming in southern Africa, and gender issues have gained a high profile in its stated aims. The case study traces the articulation of gender issues from headquarters to a pilot project in Luapula Province, Zambia. RESUME La pisciculture au féminin En dépit de l'acceptation apparemment répandue de l'analyse du genre dans les organisations développementales, il est rare que cette analyse soit consacrée dans des pratiques qui respectent le genre. S'il est vrai que le langage du genre et du développement est adopté, l'on constate d'un autre côté un décalage subtil vers les “projets pour femmes”. Le présent article s'adresse à ce problème par le biais d'une étude de cas basée sur un programme mené par une organisation internationale de développement – la FAO. Le programme concerné organise des projets de pisciculture de petite envergure en Afrique australe, et les questions du genre occupent une place d'importance dans ses objectifs déclarés. L'étude de cas trace l'articulation des questions du genre à partir du siège et jusqu'à un projet pilote organisé dans la province de Luapula en Zambie. RESUMEN ‘Fish and feminists’ A pesar de la aparente aceptación del análisis de género dentro de las organizaciones de desarrollo, esta aceptación rara vez se traduce en prácticas sensibles a la cuestión. Se adopta el lenguaje de género y desarrollo, pero al mismo tiempo se produce un sutil cambio de dirección hacia proyectos para la mujer. Este artículo considera el problema a través del estudio de un programa de una organización internacional de desarrollo – la FAO. Este programa promueve piscifactorías en pequeña escala en Africa del Sur, y los tópicos de género han ganado mucha importancia ensus objetivos establecidos. El estudio de este caso analiza paso a paso la articulación de las cuestiones de género desde las oficinas centrales hasta un proyecto piloto en la provincia de Luapula, en Zambia

Coding the assembly of polyoxotungstates with a programmable reaction system

Chemical transformations are normally conducted in batch or flow mode, thereby allowing the chemistry to be temporally or spatially controlled, but these approaches are not normally combined dynamically. However, the investigation of the underlying chemistry masked by the self-assembly processes that often occur in one-pot reactions and exploitation of the potential of complex chemical systems requires control in both time and space. Additionally, maintaining the intermediate constituents of a self-assembled system “off equilibrium” and utilizing them dynamically at specific time intervals provide access to building blocks that cannot coexist under one-pot conditions and ultimately to the formation of new clusters. Herein, we implement the concept of a programmable networked reaction system, allowing us to connect discrete “one-pot” reactions that produce the building block{W11O38} ≡ {W11} under different conditions and control, in real time, the assembly of a series of polyoxometalate clusters {W12O42} ≡ {W12}, {W22O74} ≡ {W22} 1a, {W34O116} ≡ {W34} 2a, and {W36O120} ≡ {W36} 3a, using pH and ultraviolet−visible monitoring. The programmable networked reaction system reveals that is possible to assemble a range of different clusters using {W11}-based building blocks, demonstrating the relationship between the clusters within the family of iso-polyoxotungstates, with the final structural motif being entirely dependent on the building block libraries generated in each separate reaction space within the network. In total, this approach led to the isolation of five distinct inorganic clusters using a “fixed” set of reagents and using a fully automated sequence code, rather than five entirely different reaction protocols. As such, this approach allows us to discover, record, and implement complex one-pot reaction syntheses in a more general way, increasing the yield and reproducibility and potentially giving access to nonspecialists

On the complementarity of Hyper-K and LBNF

The next generation of long-baseline experiments is being designed to make a substantial step in the precision of measurements of neutrino-oscillation probabilities. Two qualitatively different proposals, Hyper-K and LBNF, are being considered for approval. This document outlines the complimentarity between Hyper-K and LBNF.Comment: 5 pager