343 research outputs found
The Dynamics of 3-dimentional micro-mechanic sensor of angle motions of a robot-hexapod
Transfer function matrices of 3d MEMS sensor of angular motions and spectral density of noises measurements were estimated with the help of the method of structural identification for first time. This provides the possibility to control and operate the angle position of the platform of robot-hexapod
Entanglement entropy in fermionic Laughlin states
We present analytic and numerical calculations on the bipartite entanglement
entropy in fractional quantum Hall states of the fermionic Laughlin sequence.
The partitioning of the system is done both by dividing Landau level orbitals
and by grouping the fermions themselves. For the case of orbital partitioning,
our results can be related to spatial partitioning, enabling us to extract a
topological quantity (the `total quantum dimension') characterizing the
Laughlin states. For particle partitioning we prove a very close upper bound
for the entanglement entropy of a subset of the particles with the rest, and
provide an interpretation in terms of exclusion statistics.Comment: 4+ pages, 3 figures. Minor changes in v
The Dynamic Characteristics of the Manipulator With Parallel Kinematic Structure Based on Experimental Data
The chapter presents two identification techniques which the authors found
most useful in examining the dynamic characteristics of a manipulator with
a parallel kinematic structure as an object of control. These techniques
emphasize a frequency domain approach. If all input/output signals of an
object can be measured, then the first one of such techniques may be used for
identification. In the case when all disturbances can’t be measured, the second
identification technique may be used
Багатовимірна структурна ідентифікація при регулярних сигналах
New structural identification algorithm at a regular signals for the multidimensional objects with unstable poles is discussed in this article. This algorithm is based on the use of transformation of Laplace for the decision of reverse control task. It allows to find the object transfer matrices from the control input and from the indignation input as a result of the quadratic functional minimization. Новий алгоритм структурної ідентифікації багатовимірних можливо нестійких об’єктів при регулярних сигналах розглянуто у статті. Зазначений алгоритм заснований на використанні перетворення Лапласу для розв’язання зворотної задачі керування. Він дозволяє знаходити матриці передатних функцій об’єкта від регульованого входу та від збурення в результаті мінімізації квадратичного функціоналу якості
Particle Number Fluctuations in the Microcanonical Ensemble
Particle number fluctuations are studied in the microcanonical ensemble. For
the Boltzmann statistics we deduce exact analytical formulae for the
microcanonical partition functions in the case of non-interacting massless
neutral particles and charged particles with zero net charge. The particle
number fluctuations are calculated and we find that in the microcanonical
ensemble they are suppressed in comparison to the fluctuations in the canonical
and grand canonical ensembles. This remains valid in the thermodynamic limit
too, so that the well-known equivalence of all statistical ensembles refers to
average quantities, but does not apply to fluctuations. In the thermodynamic
limit we are able to calculate the particle number fluctuations in the system
of massive bosons and fermions when the exact conservation laws of both the
energy and charge are taken into account.Comment: REVTeX, 17 pages, 9 figures, v3: misprints a correcte
Particle Number Fluctuations in Statistical Model with Exact Charge Conservation Laws
Even though the first momenta i.e. the ensemble average quantities in
canonical ensemble (CE) give the grand canonical (GC) results in large
multiplicity limit, the fluctuations involving second moments do not respect
this asymptotic behaviour. Instead, the asymptotics are strikingly different,
giving a new handle in study of statistical particle number fluctuations in
relativistic nuclear reactions. Here we study the analytical large volume
asymptotics to general case of multispecies hadron gas carrying fixed baryon
number, strangeness and electric charge. By means of Monte Carlo simulations we
have also studied the general multiplicity probability distributions taking
into account the decay chains of resonance states.Comment: 4 pages, 2 figures. The report of the talk given in Strangeness in
Quark Matter 2004, Cape Town. Submitted to J. Phys. G: Nucl. Part. Phy
Ідентифікація сигналів в трактах керування платформи гексапода
The paper deals method of identification useful signals, the disturbance and interference operatinghexapod platform management system for modeling large-scale marine spatial pitching shipПроведена идентификация полезных сигналов, возмущений и помех, действующих в системе управления платформы гексапода при моделировании пространственной качки крупнотоннажного морского суднаПроведено ідентифікацію корисних сигналів, збурень і завад, що діють у системі керування платформи гексаподапри моделюванні просторової качки крупнотонажного морського судн
Optimal Control of Leader-Following Robots under Random Effects
The article focuses on the development of an on-board system design method for optimal control of an autonomous mobile group of objects. It is assumed that the group consists of a leader and some agents. A new method for the synthesis of an optimal multivariable control system, which is needed for preserving desired position of the agent relatively to the leader was substantiated in the article. The leader passes along a random trajectory and measurement of the agent position with respect to the leader is accompanied with random noise. All group members experience the action of random disturbances
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