2,457 research outputs found
Intersegmental Coordination in the Kinematics of Prehension Movements of Macaques
The most popular model to explain how prehensile movements are organized assumes that they comprise two "components", the reaching component encoding information regarding the object's spatial location and the grasping component encoding information on the object's intrinsic properties such as size and shape. Comparative kinematic studies on grasping behavior in the humans and in macaques have been carried out to investigate the similarities and differences existing across the two species. Although these studies seem to favor the hypothesis that macaques and humans share a number of kinematic features it remains unclear how the reaching and grasping components are coordinated during prehension movements in free-ranging macaque monkeys. Twelve hours of video footage was filmed of the monkeys as they snatched food items from one another (i.e., snatching) or collect them in the absence of competitors (i.e., unconstrained). The video samples were analyzed frame-by-frame using digitization techniques developed to perform two-dimensional post-hoc kinematic analyses of the two types of actions. The results indicate that only for the snatching condition when the reaching variability increased there was an increase in the amplitude of maximum grip aperture. Besides, the start of a break-point along the deceleration phase of the velocity profile correlated with the time at which maximum grip aperture occurred. These findings suggest that macaques can spatially and temporally couple the reaching and the grasping components when there is pressure to act quickly. They offer a substantial contribution to the debate about the nature of how prehensile actions are programmed
Design and implementation of an automatic measurement system for the characterization of power MOSFETs
Peer Reviewe
Stoquasticity in circuit QED
We analyze whether circuit-QED Hamiltonians are stoquastic focusing on
systems of coupled flux qubits: we show that scalable sign-problem free path
integral Monte Carlo simulations can typically be performed for such systems.
Despite this, we corroborate the recent finding [arXiv:1903.06139] that an
effective, non-stoquastic qubit Hamiltonian can emerge in a system of
capacitively coupled flux qubits. We find that if the capacitive coupling is
sufficiently small, this non-stoquasticity of the effective qubit Hamiltonian
can be avoided if we perform a canonical transformation prior to projecting
onto an effective qubit Hamiltonian. Our results shed light on the power of
circuit-QED Hamiltonians for the use of quantum adiabatic computation and the
subtlety of finding a representation which cures the sign problem in these
system
Torsion pendulum facility for direct force measurements of LISA GRS related disturbances
A four mass torsion pendulum facility for testing of the LISA GRS is under
development in Trento. With a LISA-like test mass suspended off-axis with
respect to the pendulum fiber, the facility allows for a direct measurement of
surface force disturbances arising in the GRS. We present here results with a
prototype pendulum integrated with very large-gap sensors, which allows an
estimate of the intrinsic pendulum noise floor in the absence of sensor related
force noise. The apparatus has shown a torque noise near to its mechanical
thermal noise limit, and would allow to place upper limits on GRS related
disturbances with a best sensitivity of 300 fN/Hz^(1/2) at 1mHz, a factor 50
from the LISA goal. Also, we discuss the characterization of the gravity
gradient noise, one environmental noise source that could limit the apparatus
performances, and report on the status of development of the facility.Comment: Submitted to Proceedings of the 6th International LISA Symposium, AIP
Conference Proceedings 200
Homological Quantum Rotor Codes: Logical Qubits from Torsion
We formally define homological quantum rotor codes which use multiple quantum
rotors to encode logical information. These codes generalize homological or CSS
quantum codes for qubits or qudits, as well as linear oscillator codes which
encode logical oscillators. Unlike for qubits or oscillators, homological
quantum rotor codes allow one to encode both logical rotors and logical qudits,
depending on the homology of the underlying chain complex. In particular, such
a code based on the chain complex obtained from tessellating the real
projective plane or a M\"{o}bius strip encodes a qubit. We discuss the distance
scaling for such codes which can be more subtle than in the qubit case due to
the concept of logical operator spreading by continuous stabilizer
phase-shifts. We give constructions of homological quantum rotor codes based on
2D and 3D manifolds as well as products of chain complexes. Superconducting
devices being composed of islands with integer Cooper pair charges could form a
natural hardware platform for realizing these codes: we show that the
--qubit as well as Kitaev's current-mirror qubit -- also known as the
M\"{o}bius strip qubit -- are indeed small examples of such codes and discuss
possible extensions.Comment: 47 pages, 10 figures, 2 table
Corneal Cross-Linking for the Treatment of Keratoconus in a Patient with Ipsilateral Myelinated Retinal Nerve Fiber Layer
Keratoconus associated with myelinated retinal nerve fibers is not frequent and the relationship between the two pathologies is difficult to explain, therefore studies and further investigation are required. The etiology of each condition may suggest the role of genetic factors. Follow-up is important to evaluate the progression of keratoconus and myelination. Here we describe the unusual coexistence of keratoconus and ipsilateral myelinated retinal nerve fiber layer and, for the first time, the corneal cross-linking treatment in this condition
Existence of Positive Eigenfunctions to an Anisotropic Elliptic Operator via Sub-Super Solutions Method
Using the sub-supersolution method we study the existence of positive
solutions for the anisotropic problem \begin{equation}
-\sum_{i=1}^N\frac{\partial}{\partial x_i}\left( \left|\frac{\partial
u}{\partial x_i}\right|^{p_i-2}\frac{\partial u}{\partial x_i}\right)=\lambda
u^{q-1} \end{equation} where is a bounded and regular domain of
, and .Comment: 11 pages, references 16 title
Use of surrogate endpoints in healthcare policy : proposal for consistent adoption of a validation framework
We propose a three step framework for the evaluation of surrogate endpoints for health policy decisions on health technologies
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