61 research outputs found
Performance Analysis of WDM-PON Architecture for Wireless Services Distribution in Future Aircraft Networks
In this work, an in-depth analysis concerning the transmission performance of IEEE802.11g/n (Wi-Fi) signals in a WDM-PON system is presented. It is considered that the optical/electrical transceivers are based on low-cost 850 nm VCSELs and PIN photodiodes. System modelling includes the impact of noise generated in the optical path, such as relative intensity noise (RIN), shot noise, photodetector thermal noise, clipping and intermodulation distortion. An analytic analysis based on Volterra series is conducted and mathematical expressions for both the EVM and SNR are derived. The theoretical analysis is also compared with experimental results. Among several conclusions, it is observed that the laser intermodulation distortion, clipping and RIN are the most relevant factors
Forward-central two-particle correlations in p-Pb collisions at root s(NN)=5.02 TeV
Two-particle angular correlations between trigger particles in the forward pseudorapidity range (2.5 2GeV/c. (C) 2015 CERN for the benefit of the ALICE Collaboration. Published by Elsevier B. V.Peer reviewe
Event-shape engineering for inclusive spectra and elliptic flow in Pb-Pb collisions at root(NN)-N-S=2.76 TeV
Peer reviewe
Elliptic flow of muons from heavy-flavour hadron decays at forward rapidity in Pb-Pb collisions at root s(NN)=2.76TeV
The elliptic flow, v(2), of muons from heavy-flavour hadron decays at forward rapidity (2.5 <y <4) is measured in Pb-Pb collisions at root s(NN)= 2.76TeVwith the ALICE detector at the LHC. The scalar product, two- and four-particle Q cumulants and Lee-Yang zeros methods are used. The dependence of the v(2) of muons from heavy-flavour hadron decays on the collision centrality, in the range 0-40%, and on transverse momentum, p(T), is studied in the interval 3 <p(T)<10 GeV/c. A positive v(2) is observed with the scalar product and two-particle Q cumulants in semi-central collisions (10-20% and 20-40% centrality classes) for the p(T) interval from 3 to about 5GeV/c with a significance larger than 3 sigma, based on the combination of statistical and systematic uncertainties. The v(2) magnitude tends to decrease towards more central collisions and with increasing pT. It becomes compatible with zero in the interval 6 <p(T)<10 GeV/c. The results are compared to models describing the interaction of heavy quarks and open heavy-flavour hadrons with the high-density medium formed in high-energy heavy-ion collisions. (C) 2015 CERN for the benefit of the ALICE Collaboration. Published by Elsevier B.V.Peer reviewe
Performance assessment of subcarrier multiplexed optical systems:implications of laser nonlinearities
Neurophysiological comparative response to clinical and surgical treatment of the ulnar neuropathy in leprosy
A neuropatia de hanseníase pode desenvolver quadros inflamatórios subagudos e crônicos denominados reações, os quais podem evoluir para compressões nos túneis anatômicos. Objetivo: Descrever os achados de condução nervosa (CN) tardios em pacientes com neuropatia ulnar no cotovelo submetidos aos tratamentos clínico e cirúrgico. Método: Vinte e sete nervos de 21 pacientes foram selecionados em uma coorte retrospectiva não-concorrente por um a três anos, sendo formados dois grupos. Após o tratamento clínico sem sinais inequívocos de melhora os nervos foram randomizados para manter o tratamento clinico (Grupo A1) ou adicionar a descompressão do nervo (Grupo A2). Resultados: Os autores observaram melhora significativa nas seguintes variáveis no Grupo A2, tratado com a adição da descompressão cirúrgica, amplitude do potencial de ação motor composto (PAMC) no cotovelo e acima do cotovelo e velocidade de condução (VC) ao longo do antebraço. Conclusão: O ganho em amplitudes dos PAMCs no cotovelo e acima do cotovelo e da velocidade de condução (VC) ao longo do antebraço são a expressão do efeito tardio da descompressão do nervo ulnar. A persistência de dispersão temporal (DT) através do cotovelo foi relacionada a nova reação ou solução cirúrgica incompleta. Entretanto, a persistência de redução moderada da VC através do cotovelo sem a DT foi discutida e considerada como remielinização parcial esperada. A graduação previa da lesão do nervo baseada na amplitude dos PAMCs apresentou relação direta aos resultados menos favoráveis.Leprosy neuropathy may develop into subacute and chronic inflammatory scenarios, called reactions, which may cause entrapments in the anatomic tunnels. Objective: This study describes the late nerve conduction findings in patients with ulnar neuropathy at the elbow that were submitted to clinical and surgery treatments. Methods: A total of 27 nerves of 21 patients with borderline leprosy during type 1 (reversal) reaction were selected in a non- competing retrospective cohort for three years. The nerves with treated clinically active neuropathy (Group A1) were randomized for inclusion of surgical treatment (Group A2) after one month of clinical treatment without clear signs of clinical and neurophysiological improvement. Fifteen nerves were randomly chosen for surgery while 12 were clinically treated, after steroids treatment without expected response. Nerve conduction was measured before and after treatment on four occasions. Results: The authors observed significant improvement in the following variables in the surgically treated nerves: compound motor action potential amplitude (CMAP) at elbow and above elbow and conduction velocity (CV) along the forearm. Conclusion: The improvement of CMAP amplitudes and conduction velocity (CV) along the forearm express the late effect of nerve decompression. Persistence of temporal dispersion (TD) along the elbow was related to the new reaction or to incomplete surgical solution. However, moderate reduction in CV along the elbow, without TD, was considered an indication of na expected partial remyelination. Previous gradation of the nerve lesion based on the CMAP amplitude was related to the most severe results
Libro conmemorativo de los doscientos años de creación de la corte de almirantazgo de Venezuela
La presente publicación se estructura en 29 capítulos distribuidos en tres partes, la primera contiene las contribuciones históricas, la segunda, reflexiones sobre varios aspectos de la realidad del ámbito jurídico marítimo venezolano y la tercera doctrina sobre diversos temas de Derecho Marítimo
燒津鰹漁業に於ける船仲組織(上) - 本邦漁業に特異なる勞働組織の一例 -
We report on the measurement of freeze-out radii for pairs of identical-charge pions measured in Pb-Pb collisions at √sNN = 2.76 TeV as a function of collision centrality and the average transverse momentum of the pair kT. Three-dimensional sizes of the system (femtoscopic radii), as well as direction-averaged onedimensional radii are extracted. The radii decrease with kT, following a power-law behavior. This is qualitatively consistent with expectations from a collectively expanding system, produced in hydrodynamic calculations. The radii also scale linearly with _dNch/dη_1/3. This behavior is compared to world data on femtoscopic radii in heavy-ion collisions. While the dependence is qualitatively similar to results at smaller √sNN, a decrease in the ratio Rout/Rside is seen, which is in qualitative agreement with a specific prediction from hydrodynamic models: a change from inside-out to outside-in freeze-out configuration. The results provide further evidence for the production of a collective, strongly coupled system in heavy-ion collisions at the CERN Large Hadron Collider
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