2,794 research outputs found
ASPECTS REGARDING THE EPIGEE ENTOMOFAUNE EXISTING IN SOME AGRICULTURAL CROPS
Observations were made in 2016 in apple tree plantations, corn crops and cabbage crops belonging to the Vasile Adamachi farm, Iasi, Iasi County. The purpose of the paper was to compare the entomofauna by a number of 3 different crops as well as agroecosystem technology and conditions. The material was harvested using Barber soil traps from June until September inclusive. The collected material was cleaned of vegetal remains and was then prepared for identification at insect level. The analysis of the collected material shows that the specimens collected belong to the Hexapoda Class, with several orders of insects and the Arachnida Class, the Aranea order. Most of them belong to the Insecta class. The orders to which the species are collected are: Coleoptera, Heteroptera, Hymenoptera, Diptera, all of the Hexapoda class. Regarding the abundance of entomofauna on crops, it is found that most of the cabbage crops were collected (126) followed by apple crops (123) and then corn cultures (107).Â
OBSERVATIONS ON THE STRUCTURE, DYNAMICS AND ABBREVIATION OF ENTOMOFAUNE COLLECTED FROM CERTAIN AGRICULTURAL CROPS
The remarks were made in 2016 in the fruit tree, pear, peach, vine plantations, corn crops and cabbage crops, in two stations, stationary Vasile Adamachi, Iasi Iasi county and Ezereni farm in the Miroslava, Iasi County. The purpose of the paper was to compare the entomofauna by a number of different agricultural and field cultures, different as well as agroecosystem technology and conditions.The material was collected using the entomological filet, from June until September inclusive.The collected material was cleaned of vegetal remains and was then prepared for identification at species level. The analysis of the collected material shows that the samples collected belong to the Hexapoda Class, with several insect orders and the Arachnida Class, the Aranea order and the Acari order. Most of them belong to the Insecta class. The orders to which the species are collected are: Coleoptera, Heteroptera, Hymenoptera, Diptera, all of the Hexapoda class. As regards the abundance entomofauna, cultures, it is found that the wheat had been collected the multiple copies (69) followed by the growing of maize (39) and then planting vine (29) and plantations apple (24)
Probing magnetic fields in the circumgalactic medium using polarization data from MIGHTEE
The detection and study of magnetic fields surrounding galaxies is important
to understand galaxy evolution since magnetic fields are tracers for dynamical
processes in the circumgalactic medium (CGM) and can have a significant impact
on the evolution of the CGM. The Faraday rotation measure (RM) of the polarized
light of background radio sources passing through the magnetized CGM of
intervening galaxies can be used as a tracer for the strength and extent of
magnetic fields around galaxies. We use rotation measures observed by the
MIGHTEE-POL (MeerKAT International GHz Tiered Extragalactic Exploration
POLarisation) survey by MeerKAT in the XMM-LSS and COSMOS fields to investigate
the RM around foreground star-forming galaxies. We use spectroscopic catalogs
of star-forming and blue cloud galaxies to measure the RM of MIGHTEE-POL
sources as a function of the impact parameter from the intervening galaxy. We
then repeat this procedure using a deeper galaxy catalog with photometric
redshifts. For the spectroscopic star-forming sample we find a
redshift-corrected |RM| excess of 5.6 +/- 2.3 rad m-2 which corresponds to a
2.5 sigma significance around galaxies with a median redshift of z = 0.46 for
impact parameters below 130 kpc only selecting the intervenor with the smallest
impact parameter. Making use of a photometric galaxy catalog and taking into
account all intervenors with Mg < -13.6 mag, the signal disappears. We find no
indication for a correlation between redshift and RM, nor do we find a
connection between the total number of intervenors to the total |RM| . We have
presented tentative evidence that the CGM of star-forming galaxies is permeated
by coherent magnetic fields within the virial radius. We conclude that mostly
bright, star-forming galaxies with impact parameters less than 130 kpc
significantly contribute to the RM of the background radio source.Comment: 11 pages, 8 figures, accepted for publication in A&
CONGAS: a collaborative ontology development framework based on Named GrAphS
The process of ontology development involves a range of skills and know-how often requiring team work of different people, each of them with his own way of contributing to the definition and formalization of the domain representation. For this reason, collaborative development is an important feature for ontology editing tools, and should take into account the different characteristics of team participants, provide them with a dedicated working environment allowing to express their ideas and creativity, still protecting integrity of the shared work. In this paper we present CONGAS, a collaborative version of the Knowledge Management and Acquisition platform Semantic Turkey which, exploiting the potentialities brought by recent introduction of context management into RDF triple graphs, offers a collaborative environment where proposals for ontology evolution can emerge and coexist, be evaluated by team users, trusted across different perspectives and eventually converged into the main development stream
MIGHTEE-HI: The relation between the HI gas in galaxies and the cosmic web
We study the 3D axis of rotation (3D spin) of 77 HI galaxies from the
MIGHTEE-HI Early Science observations, and its relation to the filaments of the
cosmic web. For this HI-selected sample, the alignment between the spin axis
and the closest filament () is higher for galaxies
closer to the filaments, with for galaxies Mpc from their closest filament compared to
for galaxies at Mpc. We find that galaxies with a low HI-to-stellar mass ratio
() are more aligned with their closest
filaments, with ; whilst
galaxies with () tend to be
mis-aligned, with . We
find tentative evidence that the spin axis of HI-selected galaxies tend to be
aligned with associated filaments ( Mpc), but this depends on the gas
fractions. Galaxies that have accumulated more stellar mass compared to their
gas mass tend towards stronger alignment. Our results suggest that those
galaxies that have accrued high gas fraction with respect to their stellar mass
may have had their spin axis alignment with the filament disrupted by a recent
gas-rich merger, whereas the spin vector for those galaxies in which the
neutral gas has not been strongly replenished through a recent merger tend to
orientate towards alignment with the filament. We also investigate the spin
transition between galaxies with a high HI content and a low HI content at a
threshold of found in simulations,
however we find no evidence for such a transition with the current data.Comment: 11 pages, 9 figures, 5 tables, accepted for publication in MNRA
Probing magnetic fields in the circumgalactic medium using polarization data from MIGHTEE
Context. The properties and evolution of magnetic fields surrounding galaxies are observationally largely unconstrained. The detection and study of these magnetic fields is important to understand galaxy evolution since magnetic fields are tracers for dynamical processes in the circumgalactic medium (CGM) and can have a significant impact on the evolution of the CGM.
Aims. The Faraday rotation measure (RM) of the polarized light of background radio sources passing through the magnetized CGM of intervening galaxies can be used as a tracer for the strength and extent of magnetic fields around galaxies.
Methods. We used rotation measures observed by the MIGHTEE-POL (MeerKAT International GHz Tiered Extragalactic Exploration polarization) survey by MeerKAT in the XMM-LSS and COSMOS fields to investigate the RM around foreground star-forming galaxies. We used spectroscopic catalogs of star-forming and blue cloud galaxies to measure the RM of MIGHTEE-POL sources as a function of the impact parameter from the intervening galaxy. In addition, we examined the dependence of the RM on redshift. We then repeated this procedure using a deeper galaxy catalog with photometric redshifts.
Results. For the spectroscopic star-forming sample, we find a redshift-corrected |RM| excess of 5.6 ± 2.3 rad m−2 which corresponds to a 2.5σ significance around galaxies with a median redshift of z = 0.46 for impact parameters below 130 kpc only selecting the intervenor with the smallest impact parameter. Making use of a photometric galaxy catalog and taking into account all intervenors with Mg
Conclusions. We have presented tentative evidence that the CGM of star-forming galaxies is permeated by coherent magnetic fields within the virial radius. We conclude that mostly bright, star-forming galaxies with impact parameters less than 130 kpc significantly contribute to the RM of the background radio source
Single hadron response measurement and calorimeter jet energy scale uncertainty with the ATLAS detector at the LHC
The uncertainty on the calorimeter energy response to jets of particles is
derived for the ATLAS experiment at the Large Hadron Collider (LHC). First, the
calorimeter response to single isolated charged hadrons is measured and
compared to the Monte Carlo simulation using proton-proton collisions at
centre-of-mass energies of sqrt(s) = 900 GeV and 7 TeV collected during 2009
and 2010. Then, using the decay of K_s and Lambda particles, the calorimeter
response to specific types of particles (positively and negatively charged
pions, protons, and anti-protons) is measured and compared to the Monte Carlo
predictions. Finally, the jet energy scale uncertainty is determined by
propagating the response uncertainty for single charged and neutral particles
to jets. The response uncertainty is 2-5% for central isolated hadrons and 1-3%
for the final calorimeter jet energy scale.Comment: 24 pages plus author list (36 pages total), 23 figures, 1 table,
submitted to European Physical Journal
Measurement of the cross-section and charge asymmetry of bosons produced in proton-proton collisions at TeV with the ATLAS detector
This paper presents measurements of the and cross-sections and the associated charge asymmetry as a
function of the absolute pseudorapidity of the decay muon. The data were
collected in proton--proton collisions at a centre-of-mass energy of 8 TeV with
the ATLAS experiment at the LHC and correspond to a total integrated luminosity
of 20.2~\mbox{fb^{-1}}. The precision of the cross-section measurements
varies between 0.8% to 1.5% as a function of the pseudorapidity, excluding the
1.9% uncertainty on the integrated luminosity. The charge asymmetry is measured
with an uncertainty between 0.002 and 0.003. The results are compared with
predictions based on next-to-next-to-leading-order calculations with various
parton distribution functions and have the sensitivity to discriminate between
them.Comment: 38 pages in total, author list starting page 22, 5 figures, 4 tables,
submitted to EPJC. All figures including auxiliary figures are available at
https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2017-13
Technical Design Report for the PANDA Solenoid and Dipole Spectrometer Magnets
This document is the Technical Design Report covering the two large
spectrometer magnets of the PANDA detector set-up. It shows the conceptual
design of the magnets and their anticipated performance. It precedes the tender
and procurement of the magnets and, hence, is subject to possible modifications
arising during this process.Comment: 10 pages, 14MB, accepted by FAIR STI in May 2009, editors: Inti
Lehmann (chair), Andrea Bersani, Yuri Lobanov, Jost Luehning, Jerzy Smyrski,
Technical Coordiantor: Lars Schmitt, Bernd Lewandowski (deputy),
Spokespersons: Ulrich Wiedner, Paola Gianotti (deputy
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