206 research outputs found
Telegram from Irving Flicker, with response from Eliahu Epstein, regarding the Israeli Government
No full textJersey Homesteads (later the Borough of Roosevelt) was established in the 1930s as an agro-industrial cooperative community. It was established specifically for urban, Jewish garment workers, many of whom had emigrated from Europe. Mayor Irving Flicker sent a telegram to the Jewish Agency for Palenstine, to congratulate the Israeli government on its recent independence, and on the recognition by the United States of Israel as an independent country. Eliahu Epstein, Representative of the Provincial Government of Israel, sent a reply telegram to Flicker, thanking him for his message and sending his regards to the Roosevelt Community. As a predominantly Jewish community, the establishment of Israel as an independent state was a significant event that connected Jersey Homestead citizens to the global Jewish community
Corresponding author Determination of Flicker Source at the Point of Common Coupling Using Flicker Energy
No full textIn this paper a new method for determination of flicker source in power system is proposed. This method is based on the energy of flicker signal; therefore, an expression for flicker energy signals is defined, which can be successfully utilized for detection of the flicker source. The main advantage of this method is its simplicity which can be implemented in time domain and no transformation to frequency domain is required. The validity and performance of this method is verified by simulation and experimental results
Wireless optical PPM telemetry and the influence of lighting flicker
Get PDFDigital pulse-position modulation (PPM) is attractive to apply in wireless optical-telemetry systems because of its power efficiency. Usually, the bit-error rate is assumed to depend solely on the noise level. The detrimental influence of optical interference is overlooked. In this paper, interference measurements are reported, models that describe interference are presented, and it is shown that the influence of interference can be significant. Further, new rules for system design in the presence of interference are reported. It appears that, compared with the influeuce of noise, the flicker of incandescent lamps is usually negligible, but the flicker of fluorescent lamps is not negligibl
A Time Domain Behavioral Model for Oscillators Considering Flicker Noise
No full textThe phase noise behavior due to flicker noise of an oscillator has not been modeled accurately by a time domain behavioral model. In this paper, the mathematical foundation to model the up-converted flicker noise region of the phase noise is discussed and derived in detail. Based on the foundation, we present a time domain behavioral model of the oscillator and implement it in Simulink. Comparisons show that the model is as precise as the direct transistor-level circuit simulation, whether in the up-converted thermal or flicker noise region.NSFC [61471011]; R&D projects of Shenzhen city [JCYJ20150331102721193, JCYJ20160229094148396]CPCI-S(ISTP)469-47
Investigation of solutions to minimize flicker in LED lighting
No full textDecember 2014School of ArchitectureTherefore, the new knowledge contributed to the field by this dissertation study includes:In this dissertation, the author investigated and analyzed both approaches, electrical and optical, to understand the benefits and limitations of each method and quantified the tradeoffs with other important parameters of an LED system when reducing the flicker.2) The tradeoffs between flicker index and power factor and power efficiency when designing a flicker reduction electronic circuit;Since its first introduction to lighting industry in 2005, the alternating current (AC) light-emitting diode (LED) has experienced rapid development. Not needing an external driver is a distinct advantage AC LED has over direct current (DC) LED. The absence of an external driver could mean potentially higher system efficiency, fewer failure components, smaller system envelope, and lower system cost. However, one of the main drawbacks for AC LED is light flicker. According to past research studies, light flicker can cause negative health effects and also perception of light flicker is undesirable in lighting applications. A few of solutions, including electronic circuit and slow-decay phosphors, have been proposed to reduce AC LED light flicker. However, these solutions have come at the expense of lower power factor or low power efficiency in the case of electronic circuit. In the case of slow-decay phosphors, even though there are claims of reduced flicker, there aren't any studies that have shown quantified results. In a lighting system, a good solution should reduce light flicker while maintaining high values of other parameters such as power factor, power efficiency, system efficacy, color properties, and keep the system cost low.* Electrical study: The theoretical analysis and experimental validation of results showed that for the proposed flicker reduction circuit, the achievable lowest flicker index is about 0.4 while keeping high power performance (power factor > 0.9 and power efficiency > 90%). Even though the circuit reduced flicker index down to 0.4 it is still beyond the recommended value of 0.1 (by IESNA Handbook). Therefore, as an approach to further reducing the flicker index and achieving a good solution, the use of slow-decay phosphor in addition to the proposed electronic circuit was considered.* Optical study: Once again, the theoretical analysis and experimental validation of results showed that it is possible to reduce flicker index to 0.1 while maintaining good quality white light using slow decay phosphors. The analysis further resulted in a set of recommendations for slow-decay phosphor properties, including, the acceptable range of values for the decay constant, peak wavelength, full-with-at-half-maximum, and phosphor efficiency.With the knowledge gained in this study the industry can develop solutions to address the flicker issue faced by AC LED technology.1) The maximum possible flicker reduction using an electronic circuit approach;4) A mathematical model to simulate the resulting luminescence when a slow-decay phosphor is excited by a flickering source.3) A set of recommendations for a slow-decay phosphor properties that can reduce flicker to an acceptable level while maintaining good quality white light;Ph
New trends in active filters for improving power quality
No full textSince their basic compensation principles were proposed around 1970, active filters have been studied by many researchers and engineers aiming to put them into practical applications. Shunt active filters for harmonic compensation with or without reactive power compensation, flicker compensation or voltage regulation have been put on a commercial base in Japan, and their rating or capacity has ranged from 50 kVA to 60 MVA at present. In near future, the term of active filters will cover a much wider sense than that of active filters in the 1970s did. The function of active filters will be expanded from voltage flicker compensation or voltage regulation into power quality improvement for power distribution systems as the capacity of active filters becomes larger. This paper describes present states of the active filters based on state-of-the-art power electronics technology, and their future prospects toward the 21st century, including the personal view and expectation of the author</p
Le théâtre poétique de Pham Van Ky
No full textInternational audienceFLICKER (Corinne), « The poetic theater of Pham Van Ky. Le Rideau de pluie, a split dramaturgy » -As a French-speaking classic writer, Pham Van Ky is the author of almost seventy-one plays, including numerous radio plays. Le Rideau de pluie occupies an important place because it is one of the rare plays to have been staged. The duality between tradition and modernity dictates an original writing based on dual figures. Pham Van Ky finds in theater an artistic form more capable than novel or poetry of expressing the tension that tears him between East and West.FLICKER (Corinne), « Le théâtre poétique de Pham Van Ky. Le Rideau de pluie, une dramaturgie clivée », La Revue des lettres modernes, 2024 -3, L'Asie sur la scène FLICKER (Corinne), « Le théâtre poétique de Pham Van Ky. Le Rideau de pluie, une dramaturgie clivée » RÉSUMÉ -Classique francophone, Pham van Ky est l'auteur de près de soixante et onze pièces de théâtre, dont de nombreuses radiophoniques. Le Rideau de pluie occupe une place importante car c'est l'une des rares pièces à avoir été mise en scène. La dualité entre tradition et modernité lui dicte une écriture originale qui repose sur des figures duelles. Pham Van Ky trouve au théâtre une forme artistique plus à même que le roman ou la poésie d'exprimer la tension qui le déchire entre Orient et Occident. MOTS-CLÉS -théâtre, dramaturgie, Vietnam, tradition, modernit
Unravelling the illusion of flicker fusion
Get PDF\ua9 2017 The Author(s) Published by the Royal Society. All rights reserved. For over 150 years, researchers have investigated the anti-predator function of animal patterns. However, this work has mainly focused on when prey remain still, and has only recently started to incorporate motion into the study of defensive coloration. As motion breaks camouflage, a new challenge is to understand how prey avoid predators while moving around their environment, and if a moving prey can ever be camouflaged. We propose that there is a solution to this, in that a \u27flicker fusion effect\u27 can change the appearance of the prey in the eyes of their predators to reduce the chances of initial detection. This effect occurs when a high contrast pattern blurs at speed, changing the appearance of the prey, which may help them better match their background. Despite being widely discussed in the literature, the flicker fusion effect is poorly described, there is no clear theoretical framework for testing how it might reduce predation, and the terminology describing it is, at best, rather confusing. Our review addresses these three key issues to enable researchers to formulate precise predictions about when the flicker fusion effect occurs, and to test how it can reduce predation
Flicker: A Climate Fiction Novella and Analysis
No full textabstract: The novella Flicker by Rachel Ponstein is a climate fiction story. It draws influence from the post-apocalyptic and dystopian genres as well as classic gothic literature. The story utilizes elements of gothic literature including Freud's Uncanny, uneven framing, and bildungsroman. It also utilizes subhuman species to incite conversation about the importance of perspective and the use of an alternative lens on the post-Reckoning world. The disaster story is ambiguous to focus the reader on the importance of the characters and their progress throughout the journey rather than the overall plotline. The analysis below serves as an explanation for the intentional decisions made to fit a sub-genre and engage the reader in an intellectual conversation about the issues broached
Between OP, EPI and Fluxus: “The Flicker” by Tony Conrad as an Example of Artistic Strategy of Simulating the Effect of Psychoactive Substances
No full textTekst dotyczy filmu The Flicker (1966), kinematograficznego debiutu zmarłego niedawno Tony’ego Conrada – wybitnego muzyka, odważnego reżysera, głównej postaci nowojorskiego undergroundu lat 60. Autor przedstawia kluczowy film amerykańskiej awangardy lat 60. na szerokim tle kultury epoki: od ówczesnych zjawisk w sztukach wizualnych, przez wątki amerykańskiej kultury masowej, po tendencje nowojorskiej sceny muzyki eksperymentalnej. Szeroka panorama kulturowych zjawisk układa się estetykę nowego, bezpośredniego oddziaływania dzieła sztuki na odbiorcę, oddziaływania, dla którego modelem staje się działanie substancji psychoaktywnych. Estetyka ta rodzi się pomiędzy koncepcjami Johna Cage’a, Norberta Weinera oraz Williama Burroughsa. Autor w końcowej części tekstu zestawia The Flicker z innymi filmami eksperymentalnymi z tego okresu, kładąc nacisk na te powstające w środowisku Fluxusu.The text deals with The Flicker (1966), the cinematographic debut by the recently deceased Tony Conrad – an outstanding musician, a courageous director, the major character of the New York underground of the 1960s. The author presents a film key to the American avant-garde of the 1960s against the backdrop of the wider cultural trends of the era: contemporary phenomena in visual arts, themes of American mass culture, and experimental New York musical scene. The wide panorama of cultural phenomena forms a new aesthetics of art directly impacting the viewer, where the impact is modelled after the effect of psychoactive substances. This aesthetics arises out of the ideas of John Cage, Norbert Weiner and William Burroughs. The author in the final part of the article compares The Flicker with other experimental films of the period, in particular those made within the Fluxus movement
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