550 research outputs found
Impact of Yamoussoukro lakes water on lettuce quality
Waters from lakes, in Yamoussoukro city (Cote d'Ivoire), are usually used for legumes irrigation. However, these lakes were found to be polluted in previous works, inducing probably legume toxicity. The purpose of this work is to draw the relationship between water quality and legume (lettuce) one via their respective physical and chemical characteristics. This study pointed out that, even if lakes were polluted, their characteristics are in the limit of the irrigation water quality standard. In addition, lettuce samples, drawn from the surroundings of lake, respect also FAO quality standard. They are, therefore, good for consumption, and no strong relationship is found to exist between irrigation water quality and lettuce one. Moreover, we found that this water does not constitute a negative factor for environment. Journal of Applied Sciences and Environmental Management Vol. 10(1) 2006: 9-1
Exchange Field Induced Magnetoresistance in Colossal Magnetoresistance Manganites
The effect of an exchange field on electrical transport in thin films of
metallic ferromagnetic manganites has been investigated. The exchange field was
induced both by direct exchange coupling in a ferromagnet/antiferromagnet
multilayer and by indirect exchange interaction in a ferromagnet/paramagnet
superlattice. The electrical resistance of the manganite layers was found to be
determined by the absolute value of the vector sum of the effective exchange
field and the external magnetic field.Comment: 5 pages, 4 figure
Evangelical Visitor- October 2, 1911. Vol. XXV. No. 20.
Evangelical Visitor published in Harrisburg, Pa., for the exposition of true, practical piety and devoted to the spread of evangelical truths and the unity of the church. Published in the interest of the church of the Brethren in Christ on October 2, 1911. Vol. XXV. No. 20
Optical realization of universal quantum cloning
Beyond the no-cloning theorem, the universal symmetric quantum cloning
machine was first addressed by Buzek and Hillery. Here, we realized the
one-to-two qubits Buzek-Hillery cloning machine with linear optical devices.
This method relies on the representation of several qubits by a single photon.
We showed that, the fidelities between the two output qubits and the original
qubit are both 5/6 (which proved to be the optimal fidelity of one-to-two
qubits universal cloner) for arbitrary input pure states.Comment: 5 Pages, 2 Figure
Half-metallic antiferromagnets in thiospinels
We have theoretically designed the half-metallic (HM) antiferromagnets (AFMs)
in thiospinel systems, and , based on the electronic structure
studies in the local-spin-density approximation (LSDA). We have also explored
electronic and magnetic properties of parent spinel compounds of the above
systems; and are found to be HM
ferromagnets in their cubic spinel structures, while is a
ferrimagnetic insulator. We have discussed the feasibility of material
synthesis of HM-AFM thiospinel systems.Comment: 4 pages, 5 figure
Impact of Yamoussoukro Lakes Water on Lettuce Quality
Waters from lakes, in Yamoussoukro city (Cote d'Ivoire), are usually
used for legumes irrigation. However, these lakes were found to be
polluted in previous works, inducing probably legume toxicity. The
purpose of this work is to draw the relationship between water quality
and legume (lettuce) one via their respective physical and chemical
characteristics. This study pointed out that, even if lakes were
polluted, their characteristics are in the limit of the irrigation
water quality standard. In addition, lettuce samples, drawn from the
surroundings of lake, respect also FAO quality standard. They are,
therefore, good for consumption, and no strong relationship is found to
exist between irrigation water quality and lettuce one. Moreover, we
found that this water does not constitute a negative factor for
environment
Genetic study of atypical femoral fractures using exome sequencing in three affected sisters and three unrelated patients
Objectives: Atypical femoral fractures (AFF) are rare, often related to long-term bisphosphonate (BPs) tre- atment. Their pathogenic mechanisms are not precisely known and there is no evidence to identify patients with a high risk of AFF. The aim of this work is to study the genetic bases of AFFs. Material and methods: Whole-exome sequencing was carried out on 3 sisters and 3 unrelated additional patients, all treated with BPs for more than 5 years. Low frequency, potentially pathogenic variants sha- red by the 3 sisters, were selected, were selected and a network of gene and protein interactions was constructed with the data found. Results: We identified 37 rare variants (in 34 genes) shared by the 3 sisters, some not previously descri- bed. The most striking variant was the p.Asp188Tyr mutation in the enzyme geranylgeranyl pyrophos- phate synthase (encoded by the GGPS1 gene), from the mevalonate pathway and essential for osteoclast function. Another noteworthy finding was two mutations (one in the 3 sisters and one in an unrelated patient) in the CYP1A1 gene, involved in the metabolism of steroids. We identified other variants that could also be involved in the susceptibility to AFFs or in the underlying osteoporotic phenotype, such as those present in the SYDE2, NGEF, COG4 and FN1 genes. Conclusions: Our data are compatible with a model where the accumulation of susceptibility variants could participate in the genetic basis of AFFs
Testing sequential quantum measurements: how can maximal knowledge be extracted?
The extraction of information from a quantum system unavoidably implies a
modification of the measured system itself. It has been demonstrated recently
that partial measurements can be carried out in order to extract only a portion
of the information encoded in a quantum system, at the cost of inducing a
limited amount of disturbance. Here we analyze experimentally the dynamics of
sequential partial measurements carried out on a quantum system, focusing on
the trade-off between the maximal information extractable and the disturbance.
In particular we consider two different regimes of measurement, demonstrating
that, by exploiting an adaptive strategy, an optimal trade-off between the two
quantities can be found, as observed in a single measurement process. Such
experimental result, achieved for two sequential measurements, can be extended
to N measurement processes.Comment: 5 pages, 3 figure
Scheme for the implementation of a universal quantum cloning machine via cavity-assisted atomic collisions in cavity QED
We propose a scheme to implement the universal quantum cloning
machine of Buzek et.al [Phys. Rev.A 54, 1844(1996)] in the context of cavity
QED. The scheme requires cavity-assisted collision processes between atoms,
which cross through nonresonant cavity fields in the vacuum states. The cavity
fields are only virtually excited to face the decoherence problem. That's why
the requirements on the cavity quality factor can be loosened.Comment: to appear in PR
Minimum decoherence cat-like states in Gaussian noisy channels
We address the evolution of cat-like states in general Gaussian noisy
channels, by considering superpositions of coherent and squeezed-coherent
states coupled to an arbitrarily squeezed bath. The phase space dynamics is
solved and decoherence is studied keeping track of the purity of the evolving
state. The influence of the choice of the state and channel parameters on
purity is discussed and optimal working regimes that minimize the decoherence
rate are determined. In particular, we show that squeezing the bath to protect
a non squeezed cat state against decoherence is equivalent to orthogonally
squeezing the initial cat state while letting the bath be phase insensitive.Comment: 10 pages, 2 figures, references added, submitted to J. Opt.
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