86 research outputs found
Letter from Carl Hayden to Robert Fechner, Emergency Conservation Work
No full textLetter from Carl Hayden to Robert Fechner on building a Union Chapel in the Grand Canyon
Letter from Robert Fechner, Emergency Conservation Work to Carl Hayden
No full textLetter from Robert Fechner to Carl Hayden on building a Union Chapel in the Grand Canyon
Vida e morte em Fechner e Freud
No full text As concepções de vida e morte de Freud e de Fechner se entrelaçam no momento em que o primeiro, em Além do princípio do prazer (1920), aclimata ao seu arcabouço teórico o princípio fechneriano da tendência à estabilidade, tomado a partir de então como um princípio mais geral ao qual se subordina o princípio da constância (ou princípio do Nirvana). O princípio de Fechner, contudo, é destacado por Freud de uma obra publicada em 1873, onde seu autor o formula como um princípio físico que se insere em uma concepção geral sobre a vida — sobre a sua origem e o seu desenvolvimento, mas também o seu ocaso —, concepção que difere sobremaneira da visão científica usual, à qual Freud se filia. No entanto, a visão sobre a vida e a morte dos dois autores conflui a partir do ponto em comum representado pelo princípio da tendência à estabilidade, que, em Fechner, leva os organismos progressivamente ao estado inorgânico e, em Freud, parece poder ser entendido como o fundamento da pulsão de morte, que naturalmente se esforça por alcançar este mesmo fim.Palavras-Chave: Freud. Fechner. Vida. Morte. Life and death in Fechner and FreudABSTRACTFreud's and Fechner's conceptions of life and death are intertwined when the former, in Beyond the Pleasure Principle (1920), acclimatizes to his theoretical framework the Fechnerian principle of the tendency to stability, taken from then on as a more general principle to which the constancy principle (or Nirvana principle) is subordinated. Fechner's principle, however, is highlighted by Freud from a work published in 1873, where its author formulates it as a physical principle that fits into a general conception of life — about its origin and its development, but also the its sunset — a conception that differs greatly from the usual scientific view, to which Freud adheres. However, the vision of life and death of the two authors converges from the common point represented by the principle of the tendency to stability, which, in Fechner, leads organisms progressively to an inorganic state and, in Freud, seems to be understood as the foundation of the death drive, which naturally strives to achieve this very end.Keywords: Freud. Fechner. Life. Death
Ocular dominance and subjective color perception: a study using the Fechner-Benham Visual Illusion
No full textPast research has demonstrated differences in visual processing between the dominant, or preferred eye, and the non-dominant, or less preferred eye. Researchers have accounted for these differences according to either physiological mechanisms (Porac & Coren, 1976) or behavioral preferences (Mapp, Ono, & Barbeito, 2003). The behavioral preferences account can be eliminated by examining how the eyes process visual illusions which are not expected to be influenced by prior experiences. One particular illusion, the Fechner-Benham Color Illusion, involves disks featuring black and white designs which, when rotated, produce the illusion of various subjective colors within the disks (Rosenblum, Anderson, & Purple, 1981). It was hypothesized that when viewing the Fechner-Benham Illusion with the nondominant eye, participants would exhibit longer latencies for the onset of color andwould report fewer colors compared to viewing with the dominant eye and with binocular vision. The underlying physiological mechanisms that are often regarded in subjective color perception are either described high in the visual information hierarchy, in a neurophysiological site, thus eliminating the retinal level (Rhollec & Vi�not, 1999;Robinson, 1896). Or, antagonistically, they are described as taking place within theretina in terms of an uneven distribution of photoreceptor cells (Jarvis, 1977).College Honors
PSICANÁLISE E FILOSOFIA: algumas considerações a partir da relação entre Freud e Fechner
No full textThe article presents a reflection about the relationship between psychoanalysis and philosophy, parting from the theoretical encounter between Freud and Fechner. The author of a considerable philosophical and scientific work, Fechner is cited by Freud, among other places, in Beyond the pleasure principle (1920), where his principle of the tendency towards stability is connected to the Freudian theory, which then starts to consider the principle of constancy as a special case of Fechner’s principle. In this connection, the fields of psychoanalysis and philosophy touch each other in the intersectional domain of theoretical hypotheses that have the intent of representing reality, where one can delineate a work that inserts itself in the more general field of the history of ideas. At the end, it is also presented the sketch of a general panorama of the possible types of work that involve the relationship between psychoanalysis and philosophy.O artigo apresenta uma reflexão sobre a relação entre psicanálise e filosofia a partir do encontro teórico entre Freud e Fechner. Autor de uma considerável obra filosófica e científica, Fechner é citado por Freud, entre outros lugares, em Além do princípio de prazer (1920), onde o seu princípio da tendência à estabilidade será articulado à teoria freudiana, que, por sua vez, passará a considerar o princípio de constância como um caso especial do princípio fechneriano. Nesta articulação, os campos da psicanálise e da filosofia se tocam no domínio interseccional das hipóteses teóricas que têm por intento a representação da realidade, no que se pode delinear um trabalho que se insere no campo mais geral da história das ideias. Ao final, apresenta-se ainda o esboço de um panorama geral dos tipos possíveis de trabalho que envolvem a relação entre psicanálise e filosofia
Flight path planning in a turbulent wind environment
No full textTo achieve a high conversion efficiency and at the same time robust control of a pumping kite power system it is crucial to optimize the three-dimensional flight path of the tethered wing. This chapter extends a dynamic system model to account for a realistic, turbulent wind environment and adds a flight path planner using a sequence of attractor points and turn actions. Path coordinates are calculated with explicit geometric formulas. To optimize the power output the path is adapted to the average wind speed and the vertical wind profile, using a small set of parameters. The planner employs a finite state machine with switch conditions that are highly robust towards sensor errors. The results indicate, that the decline of the average power output of pumping kite power systems at high wind speeds can be mitigated. In addition it is shown, that reeling out towards the zenith after flying figure eight flight maneuvers significantly reduces the traction forces during reel-in and thus increases the total efficiency.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Delft University Wind energy research instituteWind Energ
Particle System Modelling and Dynamic Simulation of a Tethered Rigid Wing Kite for Power Generation
No full textKite Power research group at TU Delft developed the KiteSim framework for dynamic simulation of crosswind kite power systems. Currently, KiteSim has the capability to simulate leading edge inflatable kites. The use of rigid wing kites in crosswind kite power systems is becoming widespread. Accordingly, KiteSim framework is planned to be augmented to simulate the rigid wing kite power systems as well. Therefore, objective of this thesis is set to enhance the KiteSim framework in order to include the capability of the dynamic simulation of a rigid wing pumping crosswind kite power system by developing a particle system model to represent the tethered rigid wing. The particle system model of rigid wing consists of 6 point masses and 13 spring-damper elements. Positions and masses of the discrete particles are calculated in order to represent the rigid wing properties accurately. The spring-damper elements are interconnecting the particles. Lifting line theory and Kirke’s post stall correlation methods are used to create the full angle of attack aerodynamic model for wings and tails. Available atmospheric, tether and winch models of the KiteSim framework are also used for rigid wing dynamic simulations. Equation of the motion of the particle system model is formulated as an implicit problem, which is simulated by implicit Runge-Kutta method of fifth-order. Validation simulations are conducted with the particle system model of NASA SGS 1-36 flight test sailplane. Validation cases show satisfactory results with the flight test data. For the remaining simulations, AP2 PowerPlane of Ampyx Power is modelled as particle system and manually flown in KiteSim. Mass properties of the model is found to be highly accurate throughout the simulations. Power generation capabilities of the model is checked by flying figure-of-eight trajectories. Reel-out phases are investigated, a peak mechanical power of 45 kW and a mean power of 10 kW are obtained. Further comparison of the reel-out dynamic simulations with the quasi-steady theoretical calculations is done. Moreover, gliding and stalling manoeuvres are simulated for a plausibility check study. The developed particle system model for rigid wings shows satisfactory results and a potential for further development.Aerospace EngineeringAerodynamics, Wind Energy & PropulsionFlight Performance and Propulsio
A Methodology for the Design of Kite-Power Control Systems
No full textWind EnergyDelft University Wind energy research institut
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