636 research outputs found
Effects of beet western yellows virus on growth and yield of oilseed rape (Brassica napus )
Field trials were undertaken in Suffolk in commercial crops of autumn-sown oilseed rape cv.
Capricorn during 1993/94, cv. Apex in 1994/95. Plots were artificially infected with beet western
yellows virus (BWYV) using viruliferous Myzus persicae, giving 73 to 94% infection. Control plots
had natural infection ranging from 0 to 17·8%. Destructive plant samples were taken from each of
the infected and control plots throughout the seasons for growth analyses, and final yields were
measured on 44 m2 areas combine harvested from each plot. The seed yields of infected plots were
26 and 11% lower than control plots in 1994 and 1995 respectively (P<0·001).Harvested seed yields were shown to be inversely proportional to the area of the plot that was
inoculated with BWYV. Infection significantly lowered the oil content in 1995 from 47·9 to 46·8%
(P<0·001), and increased glucosinolate levels from 16·12 to 18·37 μmol/g (P<0·01). BWYV caused
a significant reduction in plant height and in numbers of primary branches in the 1993/94 trial and
had an effect on the dry weight of the leaves, stalks, racemes and pods at some sample dates in both
seasons. Virus-testing of infected plants showed that BWYV was present in the pod wall, the septum
and seed coat; two of 78 embryo samples also contained virus. It was concluded that BWYV can
cause significant yield losses in those years in which there is a high incidence of virus in the
overwintered crops.</jats:p
First results of the new n_TOF spallation target commissioning
The Neutron Time of Flight facility n_TOF located at CERN started to take data in 2001 . Due to an increase of radioactivity released in the cooling water the experiment was stopped by end of 2004 . In 2008 a new spallation target has been installed . In 2009 the collaboration has performed the full commissioning of the facility, consisting in the determination of the fluence, the beam profile, and the energy resolution of the neutron beam. After a brief description of the new target assembly, very preliminary results concerning the shape of the neutron fluence and its absolute value will be given. Measurements of the neutron beam profile will also be shown.Postprint (published version
combining first-principles with deep neural networks
JP acknowledges PhD grant SFRD/BD14610472019, Fundação para a Ciência e Tecnologia (FCT).Hybrid modeling combining First-Principles with machine learning is becoming a pivotal methodology for Biopharma 4.0 enactment. Chinese Hamster Ovary (CHO) cells, being the workhorse for industrial glycoproteins production, have been the object of several hybrid modeling studies. Most previous studies pursued a shallow hybrid modeling approach based on threelayered Feedforward Neural Networks (FFNNs) combined with macroscopic material balance equations. Only recently, the hybrid modeling field is incorporating deep learning into its framework with significant gains in descriptive and predictive power.publishersversionpublishe
Neutron beam imaging with micromegas detectors in combination with neutron time-of-flight at the n_tof facility at CERN
A bulk micromegas detector with the anode segmented in 2 orthogonal directions and equipped with a neutron/charged particle converter is employed at the neutron time-of-light (nTOF) facility at CERN to determine the incident neutron beam profile and beam interception factor as a function of the neutron energy determined by the time of flight. Discrepancies between experimental results and simulations in the values of the beam interception factor range up to 12 % and are to be ascribed to a defect in the mesh of the bulk. Nevertheless the detector proved to be really useful for checking the alignment of the neutron beam optics of the facility. Measurements with a new pixelized bulk detector for the determination of the beam interception factor are forseen before the end of 2012Postprint (published version
Reachability in High Treewidth Graphs
Reachability is the problem of deciding whether there is a path from one
vertex to the other in the graph. Standard graph traversal algorithms such as
DFS and BFS take linear time to decide reachability however their space
complexity is also linear. On the other hand, Savitch's algorithm takes
quasipolynomial time although the space bound is . Here, we study
space efficient algorithms for deciding reachability that runs simultaneously
in polynomial time.
In this paper, we show that given an vertex directed graph of treewidth
along with its tree decomposition, there exists an algorithm running in
polynomial time and space, that solves reachability in the graph
FSK-based Simultaneous Wireless Information and Power Transfer in Inductively Coupled Resonant Circuits Exploiting Frequency Splitting
Inductively coupled resonant circuits are affected by the so-called frequency
splitting phenomenon at short distances. In the area of power electronics,
tracking of one of the peak frequencies is state-of-the-art. In the data
transmission community, however, the frequency splitting effect is often
ignored. Particularly, modulation schemes have not yet been adapted to the
bifurcation phenomenon. We argue that binary frequency shift keying (2-ary FSK)
is a low-cost modulation scheme which well matches the double-peak voltage
transfer function , particularly when the quality factor is large,
whereas most other modulation schemes suffer from the small bandwidths of the
peaks. Additionally we show that a rectified version of 2-ary FSK, coined
rectified FSK (RFSK), is even more attractive from output power and
implementation points of view. Analytical and numerical contributions include
the efficiency factor, the impulse response, and the bit error performance. A
low-cost incoherent receiver is proposed. Theoretical examinations are
supported by an experimental prototype
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