6,298 research outputs found
Innovation in farming: An engaging and rewarding business model to foster digitalization
Over the last few years, innovation has been heavily driven by digitalization. This is due to the huge developments in the field of data analysis, enabled by the introduction of new technologies. Several fields have witnessed a smooth integration of digital tools along the whole value chain, unlike legacy sectors, which still face a spread mistrust towards innovative digital solutions. This paper proposes an engaging and rewarding model, taking into account the causes hindering innovation in the animal farming sector, complemented by the validation of the motivations behind its features and the obtained results
Prediction of charm-production fractions in neutrino interactions
The way a charm-quark fragments into a charmed hadron is a challenging
problem both for the theoretical and the experimental particle physics.
Moreover, in neutrino induced charm-production, peculiar processes occur such
as quasi-elastic and diffractive charm-production which make the results from
other experiments not directly comparable. We present here a method to extract
the charmed fractions in neutrino induced events by using results from
, , experiments while taking into account the
peculiarities of charm-production in neutrino interactions. As results, we
predict the fragmentation functions as a function of the neutrino energy and
the semi-muonic branching ratio, , and compare them with the available
data
Second Stage String Fragmentation Model
A string model, advocated by Bowler, provides a physical and intuitive
picture of heavy quark fragmentation. When supplemented by an ad hoc factor of
(1-z), to suppress fragmentation near z=1, it supplies an excellent fit to the
data. We extend Bowler's model by accounting for the further decay of the
massive mesonic states produced by the initial string breaking. We find that
each subsequent string break and cascade decay beyond the first, introduces a
factor of (1-z). Furthermore we find that including a finite mass for the
quarks, which pop out of the vacuum and split the string, forces the first
string breaking to produce massive states requiring further decay. This
sequence terminates at the second stage of fragmentation where only relatively
"light" heavy meson systems are formed. Thus we naturally account for the
phenomenologically required factor of (1-z). We also predict that the ratio of
(primary) fragments-vector/(vector plus scalar) should be .61. Our second stage
string fragmentation model provides an appealing picture of heavy quark
fragmentation.Comment: 15 page
Light Neutralinos in B-Decays
We consider the decays of a -meson into a pair of lightest
supersymmetric particles (LSP) in the minimal supersymmetric standard model. It
is found that the parameter space for light LSP's in the range of 1 GeV can be
appreciably constrained by looking for such decays.Comment: 9 pages, LaTex, 2 figures (hard copies of the figures available from
the Authors on request
Effect of potassium sources on potato tuber yield and chip quality.
The aim of this work was to evaluate the effect of these two potassium sources on yield, specific gravity and chip color of potato chipping cultivars. The experiment was carried out on a Dystrophic Red Latosol, in Canoinhas, Brazil, in spring season 2016
Meson Decay Constants from Isospin Mass Splittings in the Quark Model
Decay constants of and mesons are estimated within the framework of a
heavy-quark approach using measured isospin mass splittings in the , ,
and states to isolate the electromagnetic hyperfine interaction between
quarks. The values MeV and MeV are
obtained. Only experimental errors are given; possible theoretical ambiguities,
and suggestions for reducing them, are noted.Comment: 7 pages, LaTeX, EFI-92-3
Desempenho de cultivares de batata sob condições ambientais de estiagem.
BRS Ana é uma cultivar de batata que apresenta elevado potencial produtivo, película rosada, ciclo vegetativo tardio e grande vigor de planta; apresenta ainda tolerância à falta de água, provavelmente devido ao seu sistema radicular bem desenvolvido (PEREIRA et al, 2008). Ágata é a cultivar de película amarela mais cultivada no país, apresenta elevado potencial produtivo, porém, para isso, necessita de grande quantidade de insumos como adubos e defensivos, e é sabidamente sensível à falta de água (ROHR et al, 2001). Já a cultivar BRS Clara, possui película amarela, e em condições de campo mostra certa tolerância à falta de água, esta tolerância também foi observada em laboratório (ROHR et al, 2001). Dentre as espécies vegetais cultivadas pelo homem, a batata é uma das mais sensíveis à falta de água. Sendo os efeitos adversos máximos durante o período de estolonização e formação dos tubérculos. De maneira geral, essa cultura consome de 300 a 800 mm de água durante todo o ciclo, dependendo principalmente, das condições climáticas predominantes (GARCIA, 2003). A resposta diferencial de cultivares de batata ao estresse hídrico indica que há variabilidade genética para a tolerância à seca no germoplasma de batata (LEVY, 1983). Entretanto, diante da complexidade de fenotipagem para a resposta à seca, ainda são limitados os estudos abordando o estresse hídrico de seca para esta cultura (ROHR et al, 2001). O objetivo do presente trabalho foi verificar o desempenho das cultivares de batata BRS Ana, BRS Clara e Agata, cultivadas sob condições climáticas de estiagem, em relação ao rendimento de tubérculos
Note on Tests of the Factorization Hypothesis and the Determination of Meson Decay Constants
We discuss various tests of the factorization hypothesis making use of the
close relationship between semi-leptonic and factorized nonleptonic decay
amplitudes. It is pointed out that factorization leads to truely
model-independent predictions for the ratio of nonleptonic to semi-leptonic
decay rates, if in the nonleptonic decay a spin one meson of arbitrary mass or
a pion take the place of the lepton pair. Where the decay constants of those
mesons are known, these predictions represent ideal tests of the factorization
hypothesis. In other cases they may be used to extract the decay constants.
Currently available data on the decays are shown to be in excellent agreement with
the factorization results. A weighted average of the four independent values
for the QCD coefficient extracted from the data gives
suggesting that it may be equal to the Wilson coefficient evaluated
at the scale .Comment: (9 pages, ReVTeX, no figures), HD-THEP-92-3
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