A Low-Complexity Decision Feedforward Equalizer Architecture for High-Speed Receivers on Highly Dispersive Channels

This paper presents an improved decision feedforward equalizer (DFFE) for high speed receivers in the presence of highly dispersive channels. This decision-aided equalizer technique has been recently proposed for multigigabit communication receivers, where the use of parallel processing is mandatory. Well-known parallel architectures for the typical decision feedback equalizer (DFE) have a complexity that grows exponentially with the channel memory. Instead, the new DFFE avoids that exponential increase in complexity by using tentative decisions to cancel iteratively the intersymbol interference (ISI). Here, we demostrate that the DFFE not only allows to obtain a similar performance to the typical DFE but it also reduces the compelxity in channels with large memory. Additionally, we propose a theoretical approximation for the error probability in each iteration. In fact, when the number of iteration increases, the error probability in the DFFE tends to approach the DFE. These benefits make the DFFE an excellent choice for the next generation of high-speed receivers.Fil: Pola, Ariel Luis. Universidad Nacional de Cordoba. Facultad de Cs.exactas Fisicas y Naturales. Departamento de Electronica. Laboratorio de Comunicaciones; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Cousseau, Juan Edmundo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto de Investigación En Ingeniería Eléctrica; Argentina. Universidad Nacional del Sur; ArgentinaFil: Agazzi, Oscar E.. Irvine Center Drive. ClariPhy Communications; Estados UnidosFil: Hueda, Mario Rafael. Universidad Nacional de Cordoba. Facultad de Cs.exactas Fisicas y Naturales. Departamento de Electronica. Laboratorio de Comunicaciones; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

Manejo integrado de pragas de grãos armazenados.

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Realism and the wave-function

Realism -- the idea that the concepts in physical theories refer to 'things' existing in the real world -- is introduced as a tool to analyze the status of the wave-function. Although the physical entities are recognized by the existence of invariant quantities, examples from classical and quantum physics suggest that not all the theoretical terms refer to the entities: some terms refer to properties of the entities, and some terms have only an epistemic function. In particular, it is argued that the wave-function may be written in terms of classical non-referring and epistemic terms. The implications for realist interpretations of quantum mechanics and on the teaching of quantum physics are examined.Comment: No figure

Spatio-temporal analysis of the Nrf2 activation in transgenic reporter mouse fed with high dosage of saturated or unsaturated fatty acids using in vivo bioluminescent imaging

Nuclear factor-E2 related factor 2 (Nrf2) induces the transcription of genes coding for antioxidant enzymes by binding to the Antioxidant Response Element (ARE) to contrast oxidative stress in organisms. The aim of the study was to evaluate the activation of Nrf2 in transgenic reporter mice fed saturated or polyunsaturated fatty acids and the anti-inflammatory effect of estrogens on organism. Forty-eight ARE CRE OMO reporter mice were divided into 3 groups, consisting of 16 animals, based on presence/absence of estrogens (ovariectomized female, OVX; sham female, SH; male, MA). Each group was further split in 4 subgroups of 4 animals each and fed different diets (7.5% lard, 7.5% tuna oil, 20.0% lard and 20.0% tuna oil). All diets were isonitrogenous; low fat diets were mutually isocaloric, as well as high fat diets. Twice weekly animals were injected i.p. with 100mL luciferin 15 min before the imaging session (5 min., Charge Couple Device Camera, CCD) and kept under anaesthesia while performing ventral acquisition. Photon emission in selected body areas was measured using the Living Image Software. On day 70, experimental mice were subjected to a challenge with Sodium Arsenite and subsequently sacrificed. Specific organs (i.e. brain, muscle, heart, abdominal adipose tissue, urinary bladder, stomach, liver, lung, kidney, intestine, seminal vesicles, testis, spleen, bone, ovary and uterus) were dissected and immediately subjected to ex vivo imaging session. Data were analysed by MIXED and GLM procedures of SAS software and significant differences were declared for p<.05. The results showed that dietary treatments did not affect body weight and feed intake as well as Nrf2 expression in both pre- and postchallenge phases, excepting for the abdominal region (p\ubc.031 pre-challenge); in this area, during the pre-challenge phase, OVX showed lower Nrf2 activation (p<.001). Ex vivo results outlined a significant effect of the challenge on all the considered organs (p<.001), while OVX subjects had higher Nrf2 expression on urinary bladder and kidney (p<.05) and high fat diet increased Nrf2 in urinary bladder (p<.05).Based on our findings, there is not any difference between addition of saturated or n-3 polyunsaturated fatty acids on oxidative stress. This study confirmed the protective role of estrogens under physiological condition