331 research outputs found
Business Cycle Dynamics and Shock Resilience in Chile
In this paper we use a VAR model to analyze the response of the Chilean business cycle to shocks and the capacity of the Chilean economy to withstand them (resilience). Novel features in the analysis include the introduction of an expanded set of variables to capture the impact of external shocks and domestic shocks —including policy variables; the use of an extended sample since the 1950s; and the introduction of block exogeneity to capture the small open economy feature and to better deal with identification issues. Among key results, we find that foreign shocks have been the dominant source of business cycle fluctuations, followed by monetary policy shocks, while fiscal policy shocks explain relatively little; and that despite of the increased synchronization of the domestic business cycle with international conditions, the resilience of the Chilean economy to external shocks has increased during the nineties, with countercyclical policies playing an important role in such a positive development
The orbit space of groupoids whose -algebras are GCR
Let be second countable locally compact Hausdorff groupoid with a
continuous Haar system. We remove the assumption of amenability in a theorem by
Clark about GCR groupoid -algebras. We show that if the groupoid
-algebra of is GCR then the orbits of are locally closed.Comment: 1
Value-modulated attentional capture in reward and punishment contexts, attentional control, and their relationship with psychopathology
Attentional bias towards rewards has been extensively studied in both healthy and clinical populations. Several studies have shown an association between reward value-modulated attentional capture (VMAC) and greater substance use. However, less is known about the association between these VMAC effects and internalizing symptoms. Moreover, while VMAC effects have also been found in punishment contexts, the association between punishment VMAC and psychopathology has not been studied so far. In the present two-part preregistered study, we adapted a novel VMAC task to also include a punishment context and examined associations with internalizing symptoms and substance use. Our results showed consistent VMAC effects in reward contexts across two separate studies. Attentional capture was stronger for distractors associated with high rewards than for low rewards. We replicated and extended previous findings by showing such VMAC effects in a substantially shorter task that also included alternating punishment blocks. Contrary to our expectations, we found no VMAC effects in punishment contexts and no direct associations between VMAC and symptom measures. Our results speak to the feasibility of assessing VMAC effects using a scalable and short behavioral online task, but the relationship with the development of internalizing and externalizing psychopathology remains uncertain.</p
Value-modulated attentional capture in reward and punishment contexts, attentional control, and their relationship with psychopathology
Attentional bias towards rewards has been extensively studied in both healthy and clinical populations. Several studies have shown an association between reward value-modulated attentional capture (VMAC) and greater substance use. However, less is known about the association between these VMAC effects and internalizing symptoms. Moreover, while VMAC effects have also been found in punishment contexts, the association between punishment VMAC and psychopathology has not been studied so far. In the present two-part preregistered study, we adapted a novel VMAC task to also include a punishment context and examined associations with internalizing symptoms and substance use. Our results showed consistent VMAC effects in reward contexts across two separate studies. Attentional capture was stronger for distractors associated with high rewards than for low rewards. We replicated and extended previous findings by showing such VMAC effects in a substantially shorter task that also included alternating punishment blocks. Contrary to our expectations, we found no VMAC effects in punishment contexts and no direct associations between VMAC and symptom measures. Our results speak to the feasibility of assessing VMAC effects using a scalable and short behavioral online task, but the relationship with the development of internalizing and externalizing psychopathology remains uncertain.</p
β-catenin tyrosine 654 phosphorylation increases Wnt signalling and intestinal tumorigenesis
Objective: Deregulation of the Wnt signalling pathway by mutations in the Apc or β-catenin genes underlies colorectal carcinogenesis. As a result, β-catenin stabilises, translocates t
Electrophysiological correlates of associative learning in smokers: a higher-order conditioning experiment
Background: Classical conditioning has been suggested to play an important role in the development, maintenance, and relapse of tobacco smoking. Several studies have shown that initially neutral stimuli that are directly paired with smoking are able to elicit conditioned responses. However, there have been few human studies that demonstrate the contribution of higher-order conditioning to smoking addiction, although it is assumed that higher-order conditioning predominates learning in the outside world. In the present study a higher-order conditioning task was designed in which brain responses of smokers and non-smokers were conditioned by pairing smoking-related and neutral stimuli (CS1smokeand CS1neutral) with two geometrical figures (CS2smokeand CS2neutral). ERPs were recorded to all CSs.Results: Data showed that the geometrical figure that was paired with smoking stimuli elicited significantly larger P2 and P3 waves than the geometrical figure that was paired with neutral stimuli. During the first half of the experiment this effect was only present in smokers whereas non-smokers displayed no significant differences between both stimuli, indicating that neutral cues paired with motivationally relevant smoking-related stimuli gain more motivational significance even though they were never paired directly with smoking. These conclusions are underscored by self-reported evidence of enhanced second-order conditioning in smokers.Conclusions: It can be concluded that smokers show associative learning for higher-order smoking-related stimuli. The present study directly shows the contribution of higher-order conditioning to smoking addiction and is the first to reveal its electrophysiological correlates. Although results are preliminary, they may help in understanding the etiology of smoking addiction and its persistence
High-efficiency frequency doubling of continuous-wave laser light
We report on the observation of high efficiency frequency doubling of 1550 nm
continuous-wave laser light in a nonlinear cavity containing a periodically
poled potassium titanyl phosphate crystal (PPKTP). The fundamental field had a
power of 1.10 W and was converted into 1.05 W at 775 nm, yielding a total
external conversion efficiency of (95 \pm 1)%. The latter value is based on the
measured depletion of the fundamental field being consistent with the absolute
values derived from numerical simulations. According to our model, the
conversion efficiency achieved was limited by the non-perfect mode-matching
into the nonlinear cavity and the pump power available. Our result shows that
cavity-assisted frequency conversion based on PPKTP is well suited for
low-decoherence frequency conversion of quantum states of light.Comment: 3 pages, 3 figure
On the Performance of Hybrid Functionals for Non-linear Optical Properties and Electronic Excitations in Chiral Molecular Crystals: The Case of Butterfly-Shaped Dicinnamalacetone
Purely organic chiral molecular assemblies in the solid state hold great potential for non-linear optical applications. Herein, a newly synthesised molecular system is reported, namely, dicinnamalacetone, an otherwise planar molecule that crystallises in a disordered non-centrosymmetric form with four different conformations having an overall predominance of a particular helicity. A combined experimental and theoretical approach, including single-crystal X-ray diffraction, Kurtz–Perry and ab initio methods, is employed to characterise the system and benchmark the performance of hybrid functionals for the prediction of non-linear optical properties and electronic excitations. Comparison of experiment and theory points to a particular set of hybrid functionals that provides an optimal description of this molecular system
Resonant nonlinear magneto-optical effects in atoms
In this article, we review the history, current status, physical mechanisms,
experimental methods, and applications of nonlinear magneto-optical effects in
atomic vapors. We begin by describing the pioneering work of Macaluso and
Corbino over a century ago on linear magneto-optical effects (in which the
properties of the medium do not depend on the light power) in the vicinity of
atomic resonances, and contrast these effects with various nonlinear
magneto-optical phenomena that have been studied both theoretically and
experimentally since the late 1960s. In recent years, the field of nonlinear
magneto-optics has experienced a revival of interest that has led to a number
of developments, including the observation of ultra-narrow (1-Hz)
magneto-optical resonances, applications in sensitive magnetometry, nonlinear
magneto-optical tomography, and the possibility of a search for parity- and
time-reversal-invariance violation in atoms.Comment: 51 pages, 23 figures, to appear in Rev. Mod. Phys. in Oct. 2002,
Figure added, typos corrected, text edited for clarit
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