744 research outputs found
Identification of the major active ingredients in illegal pesticide seized by Brazilian Federal Police and quantification of metsulfuron-methyl and tebuconazole
A compilação de relatórios forenses de agrotóxicos, objetos de apreensões pela Polícia Federal no Brasil, mostrou que metsulfurom-metílico, imidacloprido, fipronil, tebuconazol, clorimurom-etílico e glifosato são os principais ingredientes ativos (IA) importados ilegalmente. Apesar destes IA não estarem entre os agrotóxicos mais comercializados no país, o alto preço das formulações correspondentes legalmente registradas pode estimular esta atividade ilegal. Com base neste estudo, amostras de agrotóxicos contrabandeados apreendidos contendo tebuconazol e metsulfurom-metílico foram analisadas quantitativamente utilizando cromatografia a gás e líquida, respectivamente. Tebuconazol, em apresentações líquidas e sólidas, apresentou concentrações concordantes com as informações dos rótulos, enquanto que a maioria das amostras de metsulfurom-metílico, rotuladas como 600 g kg-1, apresentaram concentrações mais baixas nas análises químicas (média de 337,0 g kg-1 + 2,0).The compilation of forensic reports from pesticides seized by the Federal Police in Brazil showed that metsulfuron-methyl, imidacloprid, fipronil, tebuconazole, clorimuron-ether and glyphosate were the dominant active ingredients (AI) illegally imported. Despite these AI were not among the most traded pesticides in Brazil, high prices of corresponding legal formulations may stimulate this illegal activity. Based on this study, smuggled pesticides containing tebuconazole and metsulfuron-methyl were seized and quantitatively analyzed using gas and liquid chromatography, respectively. Tebuconazole results, in liquid and solid presentations, were in accordance with the information on the label, while most metsulfuron-methyl samples, labeled as 600 g kg-1, showed lower concentrations in chemical analysis (mean of 337.0 g kg-1 + 2.0)
Feasibility studies of time-like proton electromagnetic form factors at PANDA at FAIR
Simulation results for future measurements of electromagnetic proton form
factors at \PANDA (FAIR) within the PandaRoot software framework are reported.
The statistical precision with which the proton form factors can be determined
is estimated. The signal channel is studied on the basis
of two different but consistent procedures. The suppression of the main
background channel, , is studied.
Furthermore, the background versus signal efficiency, statistical and
systematical uncertainties on the extracted proton form factors are evaluated
using two different procedures. The results are consistent with those of a
previous simulation study using an older, simplified framework. However, a
slightly better precision is achieved in the PandaRoot study in a large range
of momentum transfer, assuming the nominal beam conditions and detector
performance
Observation and study of the decay
We report the observation and study of the decay
using events
collected with the BESIII detector. Its branching fraction, including all
possible intermediate states, is measured to be
. We also report evidence for a structure,
denoted as , in the mass spectrum in the GeV/
region. Using two decay modes of the meson ( and
), a simultaneous fit to the mass spectra is
performed. Assuming the quantum numbers of the to be , its
significance is found to be 4.4, with a mass and width of MeV/ and MeV, respectively, and a
product branching fraction
. Alternatively, assuming , the
significance is 3.8, with a mass and width of MeV/ and MeV, respectively, and a product
branching fraction
. The angular distribution of
is studied and the two assumptions of the
cannot be clearly distinguished due to the limited statistics. In all
measurements the first uncertainties are statistical and the second systematic.Comment: 10 pages, 6 figures and 4 table
Observation of in
Using a sample of events recorded with
the BESIII detector at the symmetric electron positron collider BEPCII, we
report the observation of the decay of the charmonium state
into a pair of mesons in the process
. The branching fraction is measured for the first
time to be , where the first uncertainty is
statistical, the second systematic and the third is from the uncertainty of
. The mass and width of the are
determined as MeV/ and
MeV.Comment: 13 pages, 6 figure
Observation of the -Annihilation Decay and Evidence for
We report on the observation of the -annihilation decay and the evidence for with a data sample corresponding to an integrated luminosity of 3.19
fb collected with the BESIII detector at the center-of-mass energy
GeV. We obtain the branching fractions
and , respectively
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