Charge symmetry breaking in light Λ\Lambda hypernuclei

Charge symmetry breaking (CSB) is particularly strong in the A=4 mirror hypernuclei $_{\Lambda}^4$H--$_{\Lambda}^4$He. Recent four-body no-core shell model calculations that confront this CSB by introducing $\Lambda$-$\Sigma^0$ mixing to leading-order chiral effective field theory hyperon-nucleon potentials are reviewed, and a shell-model approach to CSB in p-shell $\Lambda$ hypernuclei is outlined.Comment: presented by A. Gal at the 12th International Seminar on Nuclear Physics, Sant'Angelo d'Ischia, May 15-19 2017; prepared for J. Phys. Conf.; v2 -- slightly expanded versio

Improved Training for Self-Training by Confidence Assessments

It is well known that for some tasks, labeled data sets may be hard to gather. Therefore, we wished to tackle here the problem of having insufficient training data. We examined learning methods from unlabeled data after an initial training on a limited labeled data set. The suggested approach can be used as an online learning method on the unlabeled test set. In the general classification task, whenever we predict a label with high enough confidence, we treat it as a true label and train the data accordingly. For the semantic segmentation task, a classic example for an expensive data labeling process, we do so pixel-wise. Our suggested approaches were applied on the MNIST data-set as a proof of concept for a vision classification task and on the ADE20K data-set in order to tackle the semi-supervised semantic segmentation problem

The Challenges of an Ethnic-democracy: Populism, Netanyahu and Israel's Path

Soon to become Israel's longest serving Prime Minister, Benjamin Netanyahu's fourth government is regarded as the most right-wing coalition in Israeli history. While populism is on the rise worldwide, Netanyahu has been in power intermittently since the 90's – utilising a particular kind of populism articulated by Dani Filc (2009) - post-populism - to remain in power. Examining Israel's special and delicate political status as an ethnic-democracy, this chapter concludes that the current government is promoting rhetoric and policy which entail the risk of defying the balance between Israel's Jewish-ethnic character, its obligation to Democratic values and the integrity of its ethnic and political minorities. In election campaigns and attempts to secure political capital, as well as in everyday legislation, the current government has directly and indirectly targeted minorities, left-wing opposition and civil rights group. Exclusionary nationalistic rhetoric, a tool vastly used by right wing populists worldwide in the US, France, the UK and others, has become a common commodity in the Israeli right's toolbox. With the balance still preserved, Israel's democracy is facing grave challenges ahead – and as Israel's president Rubi Rivlin said, the Israeli society must ensure it reaches these challenges prepared.&nbsp

In-medium antikaon and eta-meson interactions and bound states

The role played by subthreshold meson-baryon dynamics is demonstrated in kaonic-atom, Kbar-nuclear and eta-nuclear bound-state calculations within in-medium models of Kbar-N and eta-N interactions. New analyses of kaonic atom data reveal appreciable multi-nucleon contributions. Calculations of eta-nuclear bound states show, in particular, that the eta-N scattering length is not a useful indicator of whether or not eta mesons bind in nuclei nor of the widths anticipated for such states.Comment: invited talk at the Second International Symposium on Mesic Nuclei, Cracow, Sept.22-24 2013, matches published versio

Indigenous Cognition? Review of J.W. Berry, S.H. Irvine, E.B. Hunt (Eds.), \u3cem\u3eIndigenous Cognition: Functioning in Cultural Context\u3c/em\u3e

What is known about the cognitive functions of other peoples that could enable extant psychology to become more comprehensive, to attain a \u27universal\u27 cognitive psychology? This question was the focus of a 1986 NATO workshop held at Queen\u27s University (Kingston, Ontario, Canada) whose working theme was indigenous cognition and models of information processing. The primary goal of the present volume, which contains 13 papers, is to bring together evidence from studies of cognition in those populations that have remained well outside industrialised society: the hunting people, the nomads, and the peasants of the contemporary world (p. 2). The volume begins wtih a general section that includes papers dealing primarily with theoretical concerns in cross-cultural cognitive psychology and continues with four studies among African populations and with three among Native American populations

Experimental study of internal wave generation by convection in water

We experimentally investigate the dynamics of water cooled from below at 0^oC and heated from above. Taking advantage of the unusual property that water's density maximum is at about 4^oC, this set-up allows us to simulate in the laboratory a turbulent convective layer adjacent to a stably stratified layer, which is representative of atmospheric and stellar conditions. High precision temperature and velocity measurements are described, with a special focus on the convectively excited internal waves propagating in the stratified zone. Most of the convective energy is at low frequency, and corresponding waves are localized to the vicinity of the interface. However, we show that some energy radiates far from the interface, carried by shorter horizontal wavelength, higher frequency waves. Our data suggest that the internal wave field is passively excited by the convective fluctuations, and the wave propagation is correctly described by the dissipative linear wave theory