108,031 research outputs found
The present development of time service in Brazil, with the application of the TV line-10 method for coordination and synchronization of atomic clocks
Various methods presently used for the dissemination of time at several levels of precision are described along with future projects in the field. Different aspects of time coordination are reviewed and a list of future laboratories participating in a National Time Scale will be presented. A Brazilian Atomic Time Scale will be obtained from as many of these laboratories as possible. The problem of intercomparison between the Brazilian National Time Scale and the International one will be presented and probable solutions will be discussed. Needs related to the TV Line-10 method will be explained and comments will be made on the legal aspects of time dissemination throughout the country
Generalized CP Invariance and the Yukawa sector of Two-Higgs Models
We analyze generalized CP symmetries of two-Higgs doublet models, extending
them from the scalar to the fermion sector of the theory. We show that, with a
single exception, those symmetries imply massless fermions. The single model
which accommodates a fermionic mass spectrum compatible with experimental data
possesses a remarkable feature. It displays a new type of spontaneous CP
violation, which occurs not in the scalar sector responsible for the symmetry
breaking mechanism but, rather, in the fermion sector.Comment: RevTex, 4 pages, no figures Version2: Remarkable additional
conclusion => title & text changes; section adde
The Challenges of Strategic Human Resources Management in Southeast Asian Universities
Nowadays the Higher Education Institutions face major challenges in its development.
Demanding from different actors and the orientation of the research, more oriented to
innovation and value creation, request news capacities to answer to that.
Southeast Asia shows a strong economic growth with a large increase in GDP and a
growing improvement in the position of The Human Development Index promoted by United
Nations.
This reality creates a different pressure on the higher education institutions in southeast Asia
that requires a change in the universities, in the way they implement the mission and in the
requested capacities, specially the human resources capacities.
In this way, a new paradigm and model of human resources management for southeast
higher education institutions need be developed to create the conditions to answer to this
new reality, where the main analysis variables will be talent, performance, motivation and
retention, coaching, cross cultural, integrity and permanent adaptability and flexibility.
The main objective of this communication is to reflect and contextualize in terms of
theoretical models where we find the assumptions for the implementation of strategic human
resources management for southeast Asian universities.
What kind of profile is request for the staff in this new reality?
What we need to change in human resources management?
How can this change be implemented?
What HRM tools are most relevant to this reality?
These are the main issues on which we will reflect with a critical thinking approach in order
to present a set of clues to southeast Asian universities according to our analysis and
interpretation, as Portuguese and European
Discrete and continuous symmetries in multi-Higgs-doublet models
We consider the Higgs sector of multi-Higgs-doublet models in the presence of
simple symmetries relating the various fields. We construct basis invariant
observables which may in principle be used to detect these symmetries for any
number of doublets. A categorization of the symmetries into classes is
required, which we perform in detail for the case of two and three Higgs
doublets.Comment: 13 pages, RevTex, references adde
A Model of Growth with Intertemporal Knowledge Externalities, Augmented with Contemporaneous Knowledge Externalities
The present model is essentially Romer’s (1990) model of endogenous growth with intertemporal knowledge externalities, augmented with contemporaneous knowledge externalities to give a richer explanation of the growth process. Both types of knowledge spillovers seem essential to capturing the features of knowledge in a model of growth. Introducing synchronic complementarities and knowledge externalities across inventive firms immediately creates the possibility of multiple equilibria and threshold effects in the present model. Another advantage of this theoretical formulation is that it allows for an analysis of the effects on steady-state growth of a variety of technology policies relying on changing knowledge complementarities parameters.Endogenous growth, innovation, knowledge complementarities, knowledge externalities, general equilibrium
Magnetic quantum phase transitions of the antiferromagnetic J_{1}-J_{2} Heisenberg model
We obtain the complete phase diagram of the antiferromagnetic -
model, , within the framework of the
nonlinear sigma model. We find two magnetically ordered phases, one with N\'
eel order, for , and another with collinear order, for
, separated by a nonmagnetic region, for , where a gapped spin liquid is found. The transition at is of
the second order while the one at is of the first order and the
spin gaps cross at . Our results are exact at
and agree with numerical results from different methods.Comment: 4 pages, 5 figure
Aghion And Howitt’s Basic Schumpeterian Model Of Growth Through Creative Destruction: A Geometric Interpretation
The present paper takes a geometric approach to characterize the competitive forces behind innovation and dynamic general equilibria determination in the model of growth through creative destruction constructed by Aghion and Howitt (1992). All can be comprehended intuitively from the geometric presentation. While Aghion and Howitt‘s original presentation of the basic model was essentially analytical, often with fairly intricate mathematics focusing on stationary equilibria with positive growth, the geometric presentation taken here has the benefit of making what in the original paper was a bundle of mathematical notation more comprehensible intuitively.Endogenous growth, innovation, creative destruction, general equilibrium
Doubly-periodic array of bubbles in a Hele-Shaw cell
Exact solutions are presented for a doubly-periodic array of steadily moving
bubbles in a Hele-Shaw cell when surface tension is neglected. It is assumed
that the bubbles either are symmetrical with respect to the channel centreline
or have fore-and-aft symmetry, or both, so that the relevant flow domain can be
reduced to a simply connected region. By using conformal mapping techniques, a
general solution with any number of bubbles per unit cell is obtained in
integral form. Several examples are given, including solutions for multi-file
arrays of bubbles in the channel geometry and doubly-periodic solutions in an
unbounded cell.Comment: 15 pages, 12 figure
Implications of the LHC two-photon signal for two-Higgs-doublet models
We study the implications for Two Higgs Doublet Models of the recent
announcement at the LHC giving a tantalizing hint for a Higgs boson of mass 125
GeV decaying into two photons. We require that the experimental result be
within a factor of two of the theoretical Standard Model prediction, and
analyze the type I and type II models as well as the lepton-specific and
flipped models, subject to this requirement. It is assumed that there is no new
physics other than two Higgs doublets. In all of the models, we display the
allowed region of parameter space taking the recent LHC announcement at face
value, and we analyze the , , and
expectations in these allowed regions. Throughout the entire range of parameter
space allowed by the constraint, the number of events for Higgs
decays into , and are not changed from the Standard Model
by more than a factor of two. In contrast, in the Lepton Specific model, decays
to are very sensitive across the entire -allowed region.Comment: Latex, 6 pages, 4 figures; v2 - added 2 reference
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