91,480 research outputs found
Re-sounding images: sound and image in an audiovisual age
No full textThis dissertation examines the evolving articulation of sound and image in contemporary culture, with particular reference to film. It argues that sound and image have undergone a historical machined separation, followed by a machined fusion or recombination. The machined fusion of sound and image has enabled the creation of soundful images, which are more than simply the sum of their parts. Through the infusion of sound, images are now routinely reinforced with a performed sense of presence, where they are made to sound more real, more powerful, more authentic. Through association with the image, sounds are reinforced to the extent of becoming 'realer than real'. By tracing the history of sound and image from their initial machined separation to their subsequent machined fusion, it will be argued that a new relationship has been created that has shaped an influential new mode of communication and perception
Finite-time parameters estimation of the Chua system
No full textIn this work, the unknown set of parameters of the Chua system is recovered under the hypothesys that the voltages of the capacitors are available. To this end, focusing on the differential equations, the Volterra kernel-based approach is used to perform an estimation without the uncertainty of the unmeasurable derivatives and the unknown initial conditions
Chua Corsage Memristor: Phase Portraits, Basin of Attraction, and Coexisting Pinched Hysteresis Loops
No full text The Chua Corsage Memristor is the simplest example of a passive but locally active memristor endowed with two asymptotically stable equilibrium points [Formula: see text] and [Formula: see text] when powered by an E-volt battery, where [Formula: see text]. The basin of attraction is defined by [Formula: see text], [Formula: see text] for [Formula: see text], and [Formula: see text], [Formula: see text] for [Formula: see text]. By adding an inductor of appropriate value [Formula: see text] in series with the battery, the resulting circuit undergoes a supercritical Hopf bifurcation and becomes an oscillator for [Formula: see text]. Applying a sinusoidal voltage source [Formula: see text] across the Chua corsage memristor, one finds two distinct coexisting stable periodic responses, depicted by their associated pinched hysteresis loops, of the same frequency [Formula: see text] whose basin of attraction is defined by [Formula: see text], and [Formula: see text], respectively, where [Formula: see text] depends on both amplitude A and frequency f. An in-depth and comprehensive analysis of the above global nonlinear phenomena is presented using tools from nonlinear circuit theory, such as Chua’s dynamic route method, and from nonlinear dynamics, such as phase portrait analysis and bifurcation theory. </jats:p
Continuous and pulse synchronization of Chua oscillators
No full textContinuous and pulse synchronization of two Chua oscillators has been experimentally studied. The proposed synchronization methods of chaotic oscillators are promising for application in communication facilities in the construction of secure radio systems
Site selection, structural design, construction, management and production of floating cage culture system in Malaysia
No full textThe success of cage culture system is largely determined by correct selection of favourable sites, suitable cage size and facilities and management of the system. These three elements are considered in this paper in relation to culture systems in Malaysia
Gallai-Colorings of Triples and 2-Factors of B[subscript 3]
No full textA coloring of the edges of the r-uniform complete hypergraph is a G[subscript r]-coloring if there is no rainbow simplex; that is, every set of r + l vertices contains two edges of the same color. The notion extends G[subscript 2]-colorings which are often called Gallai-colorings and originates from a seminal paper of Gallai. One well-known property of G[subscript 2]-colorings is that at least one color class has a spanning tree. J. Lehel and the senior author observed that this property does not hold for G[subscript r]-colorings and proposed to study f[subscript r](n), the size of the largest monochromatic component which can be found in every G[subscript r]-coloring of K[r over n], the complete r-uniform hypergraph. The previous remark says that f[subscript 2](n) = n, and in this note, we address the case r = 3. We prove that [(n + 3)/2] ≤ f[subscript 3](n) ≤ [4n/5], and this determines f[subscript 3](n) for n < 7. We also prove that f[subscript 3](7) = 6 by excluding certain 2-factors from the middle layer of the Boolean lattice on seven elements
Target discrimination in bubbly water
No full textA man-made sonar that can operate in bubbly water is relevant: decades of active sonar experience built up for deep water applications are insufficient for shallow water operations required of a changed maritime security landscape. In many instances, military-trained dolphins represent the only viable sonar option, and this study adds to the limited number of solutions that could in future be developed into standard military tools. A series of laboratory tests is described which examines the ideas put forward. The necessary sonar simulation model (based on current state-of-the-art techniques) is also developed. The efficacy of the Twin Inverted Pulse Sonar (TWIPS), is first demonstrated with a linear frequency modulated (LFM) waveform. While TWIPS arose in response to a video showing dolphins generating bubble nets when hunting, existing evidence of TWIPS-like pulses produced by odontocetes suggests their amplitudes appear too low for TWIPS. Instead, the review of the echolocation behaviour of other species of odontocetes yields several results and techniques, which can possibly enhance sonar performance in bubbly water. Parameters like chirp structure and pulse duration are found to be important because of the nonlinear time-dependent characteristics of bubbles. A two-pulse technique, the Biased Pulse Summation Sonar (BiaPSS), which arose from the review, is extensively tested in both simulations and measurements here. Like TWIPS, BiaPSS exhibits the primary advantage of distinguishing a solid target (linear scatterer) from the bubble cloud (nonlinear scatterers) by exploiting nonlinearities with a secondary advantage of outperforming standard sonar processing in target detection. While this does not conclusively prove that dolphins use such nonlinear processing, it demonstrates that a man-made system can classify and detect targets in bubbly water using dolphin-like sonar pulses, raising intriguing possibilities for dolphin sonar when they make bubble net
Mapping atoms to nonlinear Chua's circuits
No full textWe built a map relating single atoms in the Periodic Table and different nonlinear Chua's circuits. We show that is possible to connect energy levels in atoms, (as calculated by the simple quantization Bohr's rules), with certain special values of the circuits resistors. These values are the ones at which the system undergoes a bifurcation, characterizing the period-doubling sequence leading to the chaotic state. We found a quite universal relationship relating atoms to electronic nonlinear circuits that allows to calculate spectroscopy levels starting from the bifurcation analysis or, vice-versa, bifurcation values from the knowledge of atomic energy levels
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
[Newspaper Clipping: Author Claims Evidence of Second JFK Assassin #1]
No full textNewspaper article titled "Author Claims Evidence of Second JFK Assassin." The article states that author Richard J. Whalen concluded "that there is circumstantial evidence to support the theory of a second assassin in the shooting of President John F. Kennedy.
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