264 research outputs found
Molecular Kondo effect in flat-band lattices
The Kondo effect of a single magnetic impurity embedded in the Lieb lattice
is studied by the numerical renormalization group. When the band flatness is
present in the local density of states, it quenches the participation of all
dispersive electrons in the Kondo singlet formation, and reduces the many-body
Kondo problem to a two-electron molecular Kondo problem. The two-electron
analog of the many-body Kondo singlet, a quantum entanglement of two spins, is
stable at low temperature, and the impurity contributions to thermodynamical
and dynamical quantities are qualitatively different from that obtained in the
conventional Kondo effect in systems without flat bands. The existence
conditions of the molecular Kondo effect in narrow band systems are also
discussed
The Age of Extreme
The COVID-19 pandemic caught the entire world off guard; presenting policy-makers with various thorny issues to address. This article probes the intersection of the COVID-19 pandemic and human rights. We argue that, on the one hand, there is a growing concern about excessive and disproportionate restrictions on human rights under the guise of ‘emergency powers’. On the other, the fact that rights are not taken seriously renders every effort to ward off the infectious disease faltering. Hence, we suggest that the COVID-19 pandemic should serve as a wake-up call for countries to step up their rights commitments. Despite the exceptional nature of the pandemic, human rights must remain at the heart of the States’ legal and policy choices
Self-injurious Behavior of Children with Autism in Vietnam: Across Sectional Study
This study explored self-injurious behaviour (SIB) of autistic children in Vietnam through a crosssectional
design. 60 informants, including 57 parents and 3 caregivers completed the questionnaire on
problem behaviour consisting of aggression, self-injury, stereotyping, property destruction, other
problem behaviours and their functions. Results revealed that children experienced all mentioned
problem behaviours, especially self-injurious behaviour. The topographies of self-injurious behaviour
of the children included head-hitting, head-scratching, head-banging, hair-pulling, face-hitting, facepuncturing
with a pen, ear-scratching, lip-picking, hand-biting, hand-scratching, hand-pinching, and
belly-scratching. The most common area of self-injurious behaviour is the head. The functions of these
problem behaviours were expressed in four types (social positive reinforcement, social negative
reinforcement, automatic positive reinforcement and automatic negative reinforcement). Social
positive reinforcement appeared as a prominent function. Out of these 57 children, 21 of them who
were autistic with self-injurious behaviour went through a functional behaviour assessment (FBA) in
which the four conditions known as attention, tangible items, escape from task/activities, automatic
stimulation were tested. The results of functional behaviour assessment (FBA) further indicated the
correspondence between the FAST-R and FBA outcome on function of problem behaviour, especially
self-injurious behaviour. The research concluded that the prominent function of these self-injurious
behaviours was social function. It means self-injurious behaviours usually occur within a condition of
social interaction, especially, in this present study, in the tangible condition. The antecedent of selfinjurious
behaviour is the removal of tangibles (e.g. food, preferred items). This paper contributes to
our knowledge of self-injurious behaviour of children with autism in Vietnam where empirical
research of this field was still very rare
Developing Rural Tourism with the Participation of Related Parties in Bac Kan Province
Tourism development policy will pay attention to stakeholders, especially the people, who play an important role. However, in reality, when people participate in rural tourism development, they are not equipped with basic knowledge and skills in managing and serving tourists. Because the benefits between stakeholders are still not clear, the participation of people in rural tourism development is currently only passive. Active participation need to be directed from the Government and local authorities because the concept that rural tourism development is not only about creating economic benefits but also associated with conservation and preservation, together with keeping and promoting cultural - historical values in rural areas
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