37,044 research outputs found
Robust saturated control of human-induced floor vibrations via a proof-mass actuator
This paper is concerned with the design of a robust active vibration control system that makes use of a proof-mass actuator for the mitigation of human-induced vibrations in floor structures. Ideally, velocity feedback control (VFC) is unconditionally stable and robust to spillover effects, interlacing of poles and zeros of collocated control is then accomplished. However, the use of a proof-mass actuator influences the system dynamics and the alternating pole-zero pattern of the system formed by the actuator and structure is no longer fulfilled. However, a controlled migration of the two zeros of the root locus plot at the origin, resulting from the acceleration output, can be achieved by adding a feed-through term (FTT) to the structure acceleration output. That is, the FTT enables us to control the position of a pair of complex conjugate zeros (an anti-resonance in the frequency domain). This paper proposes the introduction of an FTT designed in such a way that the anti-resonance at the origin is located between the actuator resonance and the structure fundamental resonance. Hence, an integral controller leads to infinite gain margin and significant phase margin. Simulation and experimental results on a concrete slab strip have validated the proposed control strategy. Significant improvements in the stability properties compared with VFC are reported
Spontaneous Symmetry Breaking in Tensor Theories
In this work we study spontaneous symmetry breaking patterns in tensor
models. We focus on the patterns which lead to effective matrix theories
transforming in the adjoint of . We find the explicit form of the
Goldstone bosons which are organized as matrix multiplets in the effective
theory. The choice of these symmetry breaking patterns is motivated by the fact
that, in some contexts, matrix theories are dual to gravity theories. Based on
this, we aim to build a bridge between tensor theories, quantum gravity and
holography.Comment: 40 pp, 1 fig. Update to match the published versio
Almost Split Morphisms, Preprojective Algebras and Multiplication Maps of Maximal Rank
With a grading previously introduced by the second-named author, the
multiplication maps in the preprojective algebra satisfy a maximal rank
property that is similar to the maximal rank property proven by Hochster and
Laksov for the multiplication maps in the commutative polynomial ring. The
result follows from a more general theorem about the maximal rank property of a
minimal almost split morphism, which also yields a quadratic inequality for the
dimensions of indecomposable modules involved
A search for brown-dwarf like secondaries in cataclysmic variables
We present VTL/ISAAC infrared spectroscopy of a sample of short orbital
period cataclysmic variables which are candidates for harboring substellar
companions. We have detected the KI and NaI absorption lines of the companion
star in VY Aqr. The overall spectral distribution in this system is best fit
with a M9.5 type dwarf spectra, implying a distance of pc. VY Aqr
seems to fall far from the theoretical distribution of secondary star
temperatures around the orbital period minimum. Fitting of the IR spectral
energy distribution (SED) was performed by comparing the observed spectrum with
late-type templates. The application of such a spectral fitting procedure
suggests that the continuum shape in the 1.1-2.5 m spectral region in
short orbital period cataclysmic variables may be an useful indicator of the
companion spectral type. The SED fitting for RZ Leo and CU Vel suggests M5 type
dwarf companions, and distances of 340 110 and 150 50 pc,
respectively. These systems may be placed in the upper evolution branch for
short period cataclysmic variables.Comment: accepted for publication in MNRAS, 6 pages, 7 figure
A Tool for Integer Homology Computation: Lambda-At Model
In this paper, we formalize the notion of lambda-AT-model (where is
a non-null integer) for a given chain complex, which allows the computation of
homological information in the integer domain avoiding using the Smith Normal
Form of the boundary matrices. We present an algorithm for computing such a
model, obtaining Betti numbers, the prime numbers p involved in the invariant
factors of the torsion subgroup of homology, the amount of invariant factors
that are a power of p and a set of representative cycles of generators of
homology mod p, for each p. Moreover, we establish the minimum valid lambda for
such a construction, what cuts down the computational costs related to the
torsion subgroup. The tools described here are useful to determine topological
information of nD structured objects such as simplicial, cubical or simploidal
complexes and are applicable to extract such an information from digital
pictures.Comment: Journal Image and Vision Computing, Volume 27 Issue 7, June, 200
Reaching the Poor with Effective Microcredit: Evaluation of a Grameen Bank Replication in the Philippines
Credit provision for small and poor households has always been the major element of nongovernment organizations in alleviating poverty. Recently, there has been a move to replicate the Bangladesh Grameen Bank in the Philippines known as Landless People’s Development Fund. This paper assesses its financial viability at the borrower’s level. The institution’s sustainability is also investigated in terms of sources and fund utilization, administration costs and other branches of financial viability.financial market, poverty alleviation, land management, financial sector, poverty, financial services, credit access
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