Finding the complement of the invariant manifolds transverse to a given foliation for a 3D flow

A method is presented to establish regions of phase space for 3D vector fields through which pass no co-oriented invariant 2D submanifolds transverse to a given oriented 1D foliation. Refinements are given for the cases of volume-preserving or Cartan-Arnol’d Hamiltonian flows and for boundaryless submanifolds

Tidal Dwarf Galaxies at Intermediate Redshifts

We present the first attempt at measuring the production rate of tidal dwarf galaxies (TDGs) and estimating their contribution to the overall dwarf population. Using HST/ACS deep imaging data from GOODS and GEMS surveys in conjunction with photometric redshifts from COMBO-17 survey, we performed a morphological analysis for a sample of merging/interacting galaxies in the Extended Chandra Deep Field South and identified tidal dwarf candidates in the rest-frame optical bands. We estimated a production rate about 1.4 {\times} 10^{-5} per Gyr per comoving volume for long-lived TDGs with stellar mass 3 {\times} 10^{8-9} solar mass at 0.5<z<1.1. Together with galaxy merger rates and TDG survival rate from the literature, our results suggest that only a marginal fraction (less than 10%) of dwarf galaxies in the local universe could be tidally-originated. TDGs in our sample are on average bluer than their host galaxies in the optical. Stellar population modelling of optical to near-infrared spectral energy distributions (SEDs) for two TDGs favors a burst component with age 400/200 Myr and stellar mass 40%/26% of the total, indicating that a young stellar population newly formed in TDGs. This is consistent with the episodic star formation histories found for nearby TDGs.Comment: 9 pages, 5 figures, Accepted for publication in Astrophysics & Space Scienc

Clustered mutations in the GRIK2 kainate receptor subunit gene underlie diverse neurodevelopmental disorders (vol 108, pg 1692, 2021)

Neurolog

Reinforcement Learning for Decision Making in Sequential Visual Attention

Abstract. The innovation of this work is the provision of a system that learns visual encodings of attention patterns and that enables sequential attention for object detection in real world environments. The system embeds the saccadic decision procedure in a cascaded process where vi-sual evidence is probed at the most informative image locations. It is based on the extraction of information theoretic saliency by determining informative local image descriptors that provide selected foci of inter-est. Both the local information in terms of code book vector responses, and the geometric information in the shift of attention contribute to the recognition state of a Markov decision process. A Q-learner performs then explorative search on useful actions towards salient locations, devel-oping a strategy of useful action sequences being directed in state space towards the optimization of information maximization. The method is evaluated in experiments on real world object recognition and demon-strates efficient performance in outdoor tasks.

Effects of neonicotinoids and fipronil on non-target invertebrates: Environmental Science and Pollution Research

We assessed the state of knowledge regarding the effects of large-scale pollution with neonicotinoid insecticides and fipronil on non-target invertebrate species of terrestrial, freshwater and marine environments. A large section of the assessment is dedicated to the state of knowledge on sublethal effects on honeybees (Apis mellifera) because this important pollinator is the most studied non-target invertebrate species. Lepidoptera (butterflies and moths), Lumbricidae (earthworms), Apoidae sensu lato (bumblebees, solitary bees) and the section “other invertebrates” review available studies on the other terrestrial species. The sections on freshwater and marine species are rather short as little is known so far about the impact of neonicotinoid insecticides and fipronil on the diverse invertebrate fauna of these widely exposed habitats

A small constellation: risk factors informing police perceptions of domestic abuse

Police in the United States (US) and the United Kingdom (UK) now routinely use risk assessment tools to identify common risk factors for re-abuse and lethality when responding to domestic abuse. Nevertheless, little is known about the extent to which officers understand and perceive the importance of factors commonly included on risk assessment tools for predicting future abuse. This study attempts to shed some light into this area of research by exploring the responses of 720 British and American police officers to questions regarding how important and how essential various risk factors are for evaluating the level of risk or harm a victim of domestic abuse may face in the future. Findings indicated that British and American officers were largely in agreement about a small constellation of risk factors that they considered integral to the risk assessment process: using or threatening to use a weapon; strangulation; physical assault resulting in injury and escalation of abuse. The results revealed that officers’ country of employment, rather than their demographic characteristics or experience policing domestic abuse, was a particularly influential predictor of their perceptions, and that both the situational context and the victim’s perception about risk are important in domestic abuse risk assessment