M. J. N. Lima

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We investigated the biokinetics of 99mTc-sestamibi in the thyroid of euthyroid volunteers (EVs) and in patients with autoimmune thyroid diseases and determined the best time interval between 99mTc-sestamibi injection and calculation of uptake. Forty EVs, 30 patients with Graves’ disease (GD), 15 patients with atrophic Hashimoto’s thyroiditis (AHT) and 15(More)
Network management and maintenance in optical networks faces additional security challenges arose from increased transparency in optical network components and systems. A review on existing physical security breaches on these types of networks will be presented. From these some of the methodologies for location and detection will be described and(More)
In this paper we propose what we believe to be a novel method for monitoring chromatic dispersion (CD). We use radio-frequency (RF) power monitoring and Q-factor monitoring. We use a method for capturing opened eye diagrams with high-speed electro-optical sampling. This allows the calculation of the Q factor, here used to signal the correct CD. Simulation(More)
M. R. Becker, 2, ∗ M. A. Troxel, N. MacCrann, E. Krause, T. F. Eifler, 5 O. Friedrich, 7 A. Nicola, A. Refregier, A. Amara, D. Bacon, G. M. Bernstein, C. Bonnett, S. L. Bridle, M. T. Busha, 2 C. Chang, S. Dodelson, 12 B. Erickson, A. E. Evrard, 13 J. Frieman, 12 E. Gaztanaga, D. Gruen, 7 W. Hartley, B. Jain, M. Jarvis, T. Kacprzak, D. Kirk, A. Kravtsov, B.(More)
We report the results of a deep search for an optical counterpart to the gravitational wave (GW) event GW150914, the first trigger from the Advanced LIGO GW detectors. We used the Dark Energy Camera (DECam) to image a 102 deg area, corresponding to 38% of the initial trigger high-probability sky region and to 11% of the revised high-probability region. We(More)
This work will address the potential of a set of techniques such as coherent detection, advanced modulation formats, advanced filtering to enable ultra-high flexible bandwidth PONs as well as hybrid deployment scenarios. These enabling techniques will be shortly addressed and a revision on a set of experimental lab trials of different technologies under(More)
In this paper we observe the properties of the highly birefringent fibre Bragg gratings. Departing from that we observe its application in several scenarios: optical code division multiplexing, radio over fibre, optical amplifier characterization and wavelength conversion.
The current trends on traffic and mobile users' growth is pushing the capacity of the current networks to the limit, which has led telecommunication operators to expand their investment in infrastructure. In this context, centralized RAN (C-RAN) comes with an innovative solution for the changes that will occur in the network. C-RAN shifts all the complex(More)
The next generation of optical networks requires the development of optical technology that supports high bandwidth, such as the coherent systems. The coherent detection allows the in-phase and quadrature components of a QPSK signal to be extracted as a result of the interference with a local oscillator. An integrated optics flexible 90° hybrid(More)