5,570 research outputs found
Minimal extended flavor groups, matter fields chiral representations, and the flavor question
We show the specific unusual features on chiral gauge anomalies cancellation
in the minimal, necessarily 3-3-1, and the largest
3-4-1 weak isospin chiral gauge semisimple group leptoquark-bilepton
extensions of the 3-2-1 conventional standard model of nuclear and
electromagnetic interactions. In such models a natural explanation for the
fundamental question of fermion generation replication arises from the
self-consistency of a local gauge quantum field theory, which constrains the
number of the
QFD fermion families to the QCD color charges.Comment: 10 pages. <[email protected]
Comment on ``Majoron emitting neutrinoless double beta decay in the electroweak chiral gauge extensions''
We point out that if the majoron-like scheme is implemented within a 331
model, there must exist at least three different mass scales for the scalar
vacuum expectation values in the model.Comment: 4 pages, no figures, Revtex. To be published in Physical Review
Development of large radii half-wave plates for CMB satellite missions
The successful European Space Agency (ESA) Planck mission has mapped the
Cosmic Microwave Background (CMB) temperature anisotropy with unprecedented
accuracy. However, Planck was not designed to detect the polarised components
of the CMB with comparable precision. The BICEP2 collaboration has recently
reported the first detection of the B-mode polarisation. ESA is funding the
development of critical enabling technologies associated with B-mode
polarisation detection, one of these being large diameter half-wave plates. We
compare different polarisation modulators and discuss their respective
trade-offs in terms of manufacturing, RF performance and thermo-mechanical
properties. We then select the most appropriate solution for future satellite
missions, optimized for the detection of B-modes.Comment: 16 page
Quantization of eletric charge, the neutrino and generation nonuniversality
text of abstract It is showed that the eletric charge quantization is
unconnected to Majorana neutrino in the non-universal generations
leptoquark-bilepton flavordynamics which includes the right-handed neutrino and
an explicit U(1) factor in the gauge semisimple group.Comment: 4 pages, latex ps, no figure
The Higgs Sector of the Minimal 3 3 1 Model Revisited
The mass spectrum and the eigenstates of the Higgs sector of the minimal 3 3
1 model are revisited in detail. There are discrepancies between our results
and previous results by another author.Comment: 20 pages, latex, two figures. One note and one reference are adde
Majoron emitting neutrinoless double beta decay in the electroweak chiral gauge extensions
Fundamental mechanisms for Majoron emitting neutrinoless double beta decay in
SU(3)_C x G_W x U(1) models, for electroweak flavor chiral extensions, G_W =
SU(3)_L and SU(4)_L are pointed out. Both kinds of known Majoron emitting
processes, charged Majoron emitting where the massless Nambu-Goldstone boson
itself carries lepton charge, , and the ordinary Majoron emitting where
the boson has a small mass are found possible. PACS numbers: 11.15.Ex,
12.60.Fr, 14.80.CpComment: 18 pages, Revtex, 3 Postscript figures. To be published in
Phys.Rev.D(1 May 1998
Spray freeze-drying as a solution to continuous manufacturing of pharmaceutical products in bulk
Pharmaceutical manufacturing is evolving from traditional batch processes to continuous ones. The new global competition focused on throughput and quality of drug products is certainly the driving force behind this transition which, thus, represents the new challenge of pharmaceutical manufacturing and hence of lyophilization as a downstream operation. In this direction, the present review deals with the most recent technologies, based on spray freeze-drying, that can achieve this objective. It provides a comprehensive overview of the physics behind this process and of the most recent equipment design
Recommended from our members
A behavioral theory of alliance portfolio reconfiguration: Evidence from pharmaceutical biotechnology
Research summary: Extant research suggests that firms rationally evaluate external and/or internal contingencies when deciding how to reconfigure their alliance portfolios. We advance a behavioral perspective which assumes that managers are boundedly rational and thus rely on behavioral heuristics when making alliance portfolio reconfiguration decisions. In panel data on U.S.-listed biotechnology firms, we find that below-aspiration performance motivates a firm to form alliances with novel partners within the resource scope of its existing alliance portfolio. This effect is weakened by equity ties with existing partners and strengthened by firm-specific uncertainty. Conversely, above-aspiration performance leads to new alliances with existing partners but outside the resource scope of the firmâs existing alliance portfolio. Finally, as organizational slack increases, a firm forms alliances with novel partners focusing on new-to-the-portfolio resources.
Managerial summary: We study why and how firms change the configuration of their alliance portfolios over time. We find that actual performance relative to performance objectives, and firmsâ excess resources, are important drivers of such change. The more firms fail to meet their performance objectives, the more likely they are to form alliances with novel partners focusing on areas in which they already have one or more alliances with other partners. The more firms exceed their performance objectives, the greater their inclination to form alliances with their existing partners in areas in which they do not yet have alliances. The greater the stock of excess resources, the greater firmsâ propensities to form alliances with novel partners focusing on areas in which they do not yet have alliances
- âŠ