20,464 research outputs found
Integrating a QPSK Quantum Key Distribution Link
We present the integration of the optical and electronic subsystems of a
BB84-QKD fiber link. A highspeed FPGA MODEM generates the random QPSK sequences
for a fiber-optic delayed self-homodyne scheme using APD detectors.Comment: 2 pages, 4 figures, European Conference on Optical Communication 200
Cost, power consumption and performance analysis in SDM ROADM architectures for uncoupled spatial channels
Currently optical networks are reaching their maximum transport capacity. Different solutions
can be used to overcome this capacity limit, but we are going to study, in particular, space division multiplexing
(SDM). To use SDM, the reconfigurable optical add/drop multiplexers (ROADMs) need to be adapted to support
this multiplexing. In this paper we analyze four switching strategies used in SDM ROADMs and the respective SDM
ROADM architectures. These strategies are explained and analyzed, for uncoupled scenarios, in terms of cost
and power consumption. The impact of the physical layer impairments (PLIs) amplified spontaneous emission
noise, non-linear interference, passband narrowing due to optical filtering and in-band crosstalk is also assessed,
considering a cascade of SDM ROADMs with spatial and spatial-wavelength switching granularities. The PLI inband crosstalk, has insignificant impact, in networks with a single spatial channel or in SDM networks with spatial
granularity ROADM architecture, but in a SDM network with spatial wavelength granularity this PLI can lead to
an OSNR penalty of around 2 dB, when the number of spatial channels is high. The other PLIs have similar impacts in all networks studied.info:eu-repo/semantics/acceptedVersio
Qualidade de uvas e do mosto de videiras Syrah submetidas à adubação orgânica e fertirrigação potássica: 2º ciclo de produção.
Este trabalho teve como objetivo avaliar os efeitos da adubação orgânica e da fertirrigação potássica nas características de qualidade de uvas e do mosto de videiras Syrah cultivadas no Submédio Vale do São Francisco
Causal Effect Inference for Structured Treatments
We address the estimation of conditional average treatment effects (CATEs) for structured treatments (e.g., graphs, images, texts). Given a weak condition on the effect, we propose the generalized Robinson decomposition, which (i) isolates the causal estimand (reducing regularization bias), (ii) allows one to plug in arbitrary models for learning, and (iii) possesses a quasi-oracle convergence guarantee under mild assumptions. In experiments with small-world and molecular graphs we demonstrate that our approach outperforms prior work in CATE estimation
Vegetative compatibility and genetic analysis of Colletotrichum lindemuthianum isolates from Brazil.
Production, breeding and potential of cowpea crop in Brazil.
About 50 years ago cowpea was reported as a relatively minor tropical legume. However, in the last years, it has been emerging as one of the most important food legume of the 21st century (SINGH, 2010). Brazil is not out of this panorama. Brazilian agriculture is undergoing major technological changes and, in addition, globalization in agribusiness has caused impacts on the production chain of several crops, particularly those heavily dependent on the use of a large volume of agricultural inputs, mainly fertilizers and pesticides. Such crops have had a higher production cost each year. On the other hand, this situation has brought new opportunities. Business farmers have sought new alternatives for their production arrangements. In this context cowpea constitutes one of the best options.bitstream/item/85620/1/Doc-216-Production.pd
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