4 research outputs found
ARP & Submersive Aesthetics
No full textThe video ARP and paper Submersive Aesthetics explore what might be at stake in an act of submersion in a space of perpetual darkness. The video and paper draw on an actual tourist trip taken in 2012, where three passengers travelled in a submersible to a depth of 2,000ft below sea level just off the coast of Roatan, Honduras. The video and paper present differing encounters with a state of submersion predicated on the view through the submersible’s thirty-inch porthole. For centuries we imagined the ocean as a horizontal void, stretch for nautical mile after nautical mile across the circumference of the planet. In the twenty-first century technology is positioning the seas vertically as we reach into deeper and deeper water. Renowned environmentalists sate that exploitation is outstripping exploration as the Abyssopelagic becomes a new frontier, but one that denies all inter-subjective encounters. In the video ARP no human presence is ever seen; there is only audible reference to released oxygen and creaking steel reinforcing the separation of the confined and claustrophobic space of viewing - the sub, and the fluid space of submersion. The video sinks the audience into the space of the hydrosphere, where the human is unmoored from the known centralities of the terrestrial. The paper proposes that the dynamic, blue-black materiality of the ocean contests anthropocentric modes of knowledge by exploring a collective encounter with a state of submersion. It asks what happens when we are confronted with the space of alterity? What is it to find oneself submerged in a state that is overwhelming and fluid, with no perceivable exterior? To be totally contained and then immersed, on all sides, and crucially from above: to be surrounded by a different state – liquid, fluid, yet solid in its pressure. What happens when we recognise the primordial, but the primordial does not recognise us? Is it possible that such a decentring environment might enable other configurations
Assessment of Lipid Quality and Composition of Commercial Infant Milk Formulas in Mexico: Emphasis on Trans Fatty Acid Isomers
No full textAbstract Objective: To assess the lipid quality focusing on trans fatty acids (TFA) content of standardized milk formulas marketed in Mexico for infants aged from 0 to 36 months. Material and Methods: A total of 27 infant formulas from eight different leading brands were analyzed. Nine of them belonged to stage 1 (age < 6 months), nine to stage 2 (age 6 to 12 months) and eight to stage 3 (age > 12 months). Acquired products were treated by duplicate for extraction of total lipid content with the modified Folch method before their expiration date. Fatty acids were esterified in an alkaline medium followed by an acid-catalyzed esterification. Analysis was performed on a gas chromatograph (5890 Series II; Hewlett-Packard, USA) with a flame ionization detector. Results: Thirty-four fatty acids (C8 to C22) were identified. Most products complied with ESPHAGAN compositional requirements. Only one product exceeded the suggested limit (>3%) for TFA. Long chain polyunsaturated fatty acids (LC-PUFAs) content was consistently meager (≈78%), with low amounts of arachidonic (<0.35%) and docosahexaenoic acids (<0.2%). Conclusion: Most milk formulas complied with ESPHAGAN global recommendations. The content of TFA and LC-PUFAs was scarce in the majority of samples. * Corresponding author. A.-M. M. del Rosario et al. 27
Silicon slow-light-based photonic mixer for microwave-frequencyconversion applications
No full textThis paper was published in OPTICS LETTERS and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/OL.37.001721. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law[EN] We describe and demonstrate experimentally a method for photonic mixing of microwave signals by using a silicon electro-optical Mach¿Zehnder modulator enhanced via slow-light propagation. Slow light with a group index of ~11, achieved in a one-dimensional periodic structure, is exploited to improve the upconversion performance of an input frequency signal from 1 to 10.25 GHz. A minimum transmission point is used to successfully demonstrate the upconversion with very low conversion losses of ~7¿¿dB and excellent quality of the received I/Q modulated QPSK signal with an optimum EVM of ~8%.Financial support from FP7-224312 HELIOS project and Generalitat Valenciana under PROMETEO-2010-087 R&D Excellency Program (NANOMET) are acknowledged. F. Y.Gardes, D. J. Thomson, and G. T. Reed are supported by funding received from the UK EPSRC funding body under the grant “UK Silicon Photonics.” The author A. M. Gutiérrez thanks D. Marpaung for his useful
help.Gutiérrez Campo, AM.; Brimont, ACJ.; Herrera Llorente, J.; Aamer, M.; Martí Sendra, J.; Thomson, DJ.; Gardes, FY.... (2012). Silicon slow-light-based photonic mixer for microwave-frequencyconversion applications. Optics Letters. 37(10):1721-1723. https://doi.org/10.1364/OL.37.001721S17211723371
