1,615 research outputs found
Multicriteria evaluation of novel technologies for organic micropollutants removal in advanced water reclamation schemes for indirect potable reuse
Postprint (author's final draft
Long-distance structure of the X(3872)
We investigate heavy quark symmetries for heavy meson hadronic molecules, and
explore the consequences of assuming the X(3872) and as an
isoscalar and an isovector hadronic molecules,
respectively. The symmetry allows to predict new hadronic molecules, in
particular we find an isoscalar bound state with a mass
about 10580 MeV and the isovector charmonium partners of the and
the states. Next, we study the
three body decay. This decay mode is more sensitive to the long-distance
structure of the X(3872) resonance than its and
decays, which are mainly controlled by the short distance part of the X(3872)
molecular wave function. We discuss the final state
interactions, which in some situations become quite important. Indeed in these
cases, a precise measurement of this partial decay width could provide precise
information on the interaction strength between the charm
mesons.Comment: Talk presented at the "XI International Conference on Hyperons, Charm
and Beauty Hadrons (BEACH 2014)", Birmingham (U.K.), July 201
Gauge invariance in the presence of a cutoff
We use the method of gauging equations to construct the electromagnetic
current operator for the two-nucleon system in a theory with a finite cutoff.
The employed formulation ensures that the two-nucleon T-matrix and
corresponding five-point function, in the cutoff theory, are identical to the
ones formally defined by a reference theory without a cutoff. A feature of our
approach is that it effectively introduces a cutoff into the reference theory
in a way that maintains the long-range part of the exchange current operator;
for applications to effective field theory (EFT), this property is usually
sufficient to guarantee the predictive power of the resulting cutoff theory. In
addition, our approach leads to Ward-Takahashi (WT) identities that are linear
in the interactions.
From the point of view of EFT's where such a WT identity is satisfied in the
reference theory, this ensures that gauge invariance in the cutoff theory is
maintained order by order in the expansion.Comment: 15 pages, 2 figure
Renormalization of chiral two pion exchange NN interactions with delta excitations: correlations in the partial wave expansion
In this work we consider the renormalization of the chiral two-pion exchange
potential with explicit delta-excitations for nucleon-nucleon scattering at
next-to-leading (NLO) and next-to-next-to-leading order (N2LO). Due to the
singular nature of the chiral potentials, correlations between different
partial waves are generated. In particular we show that two-body scattering by
a short distance power like singular attractive interaction can be renormalized
in all partial waves with a single counterterm, provided the singularities are
identical. A parallel statement holds in the presence of tensor interactions
when the eigenpotentials in the coupled channel problem also coincide. While
this construction reduces the total number of counterterms to eleven in the
case of nucleon-nucleon scattering with chiral two-pion exchange interactions
with delta degrees of freedom, the differences in the scattering phases as
compared to the case with the uncorrelated partial wave renormalization become
smaller as the angular momentum is increased in the elastic scattering region.Comment: 20 pages, 8 figures, a section has been added discussing cut-off
dependence. Accepted for publication in PR
Dermoid cysts of the tongue: report of five cases and review of the literature
Dermoid cysts of the tongue are uncommon. To date, there have been nine reported cases in the English language literature. In this article, we describe five cases accessioned at our institution over a 12-year period, two of which have previously been reported. The prevalence of dermoid cysts at our institution over this period was quite low. Of 324,042 surgical cases, 0.24% (765 cases) were dermoid cysts. Of these, five were from the tongue, representing only 0.7% of the dermoid cysts accessioned and 0.0015% of the total surgical specimens. The literature is reviewed and the possible origin of these lesions is discussed
Heavy quark spin symmetry and SU(3)-flavour partners of the X (3872)
In this work, an Effective Field Theory (EFT) incorporating light SU(3)-flavour and heavy quark spin symmetries is used to describe charmed meson-antimeson bound states. At Lowest Order (LO), this means that only contact range interactions among the heavy meson and antimeson fields are involved. Besides, the isospin violating decays of the X(3872) will be used to constrain the interaction between the D and a (D) over bar* mesons in the isovector channel. Finally, assuming that the X(3915) and Y(4140) resonances are D* (D) over bar* and D-s* (D) over bar (s)* molecular states, we can determine the four Low Energy Constants (LECs) of the EFT that appear at LO and, therefore, the full spectrum of molecular states with isospin I = 0, 1/2 and 1
Caracterizacion sintomatologica y molecular del virus de la mancha anillada del papayo (PRSV) que infecta Carica papaya L. en el norte del Peru
The objective of present study was symptomatic and molecular characterization of the virus that infects Carica papaya L. in areas of northern Peru. To do this, of different fields were collected leaves of C. papaya with mosaic symptoms, chlorosis and distortion the leaf. Sap of these leaves was inoculated mechanically onto virus-free plants of C. papaya, Chenopodium murale, Ch. amaranticolor, Ch. quinoa, Cucumis melo, C. sativus and Cucurbita pepo; which they were kept at room temperature for 45 days, after which young leaves in of C. papaya, mosaic, distortion and reduction of the leaf blade was observed; in the species C. melo, C. sativus and Cucurbita pepo systemic chlorosis. Ch. murale, Ch. amaranticolor and Ch. quinoa they no showed symptoms evident. The plants infected were analyzed by serological technique NCM-ELISA and RT-PCR proving that the virus that is infecting the plantations assessed in the north of Peru, it is the papaya ringspot virus (RSVP).El presente trabajo tuvo como objetivo la caracterización sintomatológica y molecular del virus que infecta Carica papaya L. en zonas del norte peruano. Para ello, de diferentes campos en producción se colectaron hojas tiernas de C. papaya con síntomas de mosaico, clorosis, aclareo de nervaduras y distorsión de la lámina foliar. Savia de estas hojas fue inoculada en forma mecánica sobre plantas libres de virus de C. papaya, Chenopodium murale, Ch. amaranticolor, Ch. quinoa, Cucumis melo, C. sativus y Cucurbita pepo; las que fueron mantenidas a temperatura ambiente durante 45 días al cabo de los cuales en las hojas jóvenes de C. papaya se observó aclareo de nervaduras, mosaico, distorsión y reducción de la lámina foliar; en las especies C. melo, C. sativus y Cucurbita pepo clorosis sistémica, en Ch. murale, Ch. amaranticolor y Ch. quinoa no se evidenciaron sintomas. Las plantas de C. papaya, C. melo, C. sativus y Cucurbita pepo infectadas, fueron analizadas por la técnica serológica de NCM-ELISA y RT-PCR comprobándose que el virus que se encuentra infectando las plantaciones de las zonas evaluadas en el norte del Perú, es el virus de la mancha anillada del papayo (PRSV)
Recovery of rare earth elements from acidic mine waters: An unknown secondary resource
Acidic mine Drainage (AMD) is still considered one of the greatest mining sustainability challenges due to the large volumes of wastes generated and the high associated treatment cost. New regulation initiatives on sustainable development, circular economy and the need for strategic elements as Rare Earth Elements (REE) may overcome the traditional research initiatives directed to developing low cost treatment options and to develop research initiatives to identify the potential benefit of considering such AMD as a potential secondary resource. As an example, this study develops the integration of a three-stage process where REE are selectively separated from base metals (e.g. Fe, Al, Mn, Ca, Mg, Cd, Pb) and then concentrate to produce a rich REE by-product recovered as REE-phosphates. Selective separation of Fe (>99%) was achieved by total oxidation to Fe(III) and subsequent precipitation as schwertmannite at pH 3,6 ± 0.2. REE were then extracted from AMD using a sulfonic ion-exchange resin to produce concentrated REE sulfuric solutions up to 0.25 gREE/L. In a final stage selective separation of REE from Al(III), Ca(II) and Mg(II) and transitions elements (Cu, Zn, Ni) was achieved by precipitation with phosphate solutions under optimized pH control and total phosphate concentration. XRD analysis identified low-crystalline minerals. By using a thermal treatment the presence of PrPO4(s) and Cheralite (CePO4(s)) where Ce is substituted by La and Ca and Xenotime (YPO4(s)) were found as main minerals AlPO4(s) Ca,MgYPO4(s) were also identified
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