1,111 research outputs found
Charged bottomonium-like structures and
The observation of two charged bottomonium-like structures and
has stimulated extensive studies of the properties of
and . In this talk, we briefly introduce the research status of
and combined with our theoretical progress.Comment: 6 pages, 1 table, 5 figures. Plenary talk given at the international
conference The Fifth Asia-Pacific Conference on Few-Body Systems in Physics
2011 (APFB2011), Seoul, Republic of Korea, 22-26 August 201
Exploring the mediation role of self-compassion in the association between bullying perpetration and depression:A cross-culture comparison study
BackgroundBullying perpetration is a well-established risk factor for depression. One potential explanation for the elevated depression levels among perpetrators is reduced self-compassion resulting from the process of dehumanisation during bullying perpetration, while the effects of this may vary across culturesObjectiveTo explore the potential role of two dimensions of self-compassion, namely compassionate and uncompassionate self-responding, in the relationship between bullying perpetration and depression, considering cultural differences.Participants and setting3,982 adolescents aged 12–18 years from Hong Kong, Taiwan, United Kingdom, and the Netherlands completed questionnaires regarding traditional bullying and cyberbullying perpetration, self-compassion, and depressive symptoms.MethodsModerated mediation analyses were conducted, considering a potential moderating effect of Eastern and Western culture. Subgroup analyses were conducted to explore cross-cultural differences in the mediation models.ResultsSignificant associations were found between cyberbullying perpetration and depressive symptoms (β = 0.06, SE = 0.02, p = 0.007). Uncompassionate self-response partially mediated the association between traditional bullying perpetration and depressive symptoms (β = 0.08, SE = 0.01, p < 0.001). A significant interaction effect was found between traditional bullying perpetration and culture in predicting compassionate self-responding (β = 0.11, SE = 0.04, p = 0.002). Traditional bullying perpetration and compassionate self-responding were identified only in Western participants (β = 0.12, SE = 0.02, p < 0.001).ConclusionsUncompassionate self-responding mediated the association between traditional bullying perpetration and depression. Interventions and prevention programs should target uncompassionate self-responding among bullying perpetrators to prevent depressive symptoms. The distinct and culturally-specific roles of compassionate and uncompassionate self-compassion were supported, providing insights into the internal structure of self-compassion and its role in bullying behaviour.</div
Two charged strangeonium-like structures observable in the process
Via the Initial Single Pion Emission (ISPE) mechanism, we study the
invariant mass spectrum distribution of . Our calculation indicates there exist a sharp peak
structure () close to the threshold and a broad
structure () near the threshold. In addition, we
also investigate the process due to
the ISPE mechanism, where a sharp peak around the threshold
appears in the invariant mass spectrum distribution. We
suggest to carry out the search for these charged strangeonium-like structures
in future experiment, especially Belle II, Super-B and BESIII.Comment: 7 pages, 5 figures. Accepted by Eur. Phys. J.
Flux transitions in a superconducting ring
We perform a numeric study of the flux transitions in a superconducting ring
at fixed temperature, while the applied field is swept at an ideally slow rate.
The current around the ring and its free energy are evaluated. We partially
explain some of the known experimental features, and predict a considerably
large new feature: in the vicinity of a critical field, giant jumps are
expected
Compact graphene mode-locked wavelength-tunable erbium-doped fiber lasers: from all anomalous dispersion towards all normal dispersion
Soliton operation and soliton wavelength tuning of erbium-doped fiber lasers
mode locked with atomic layer graphene was experimentally investigated under
various cavity dispersion conditions. It was shown that not only wide range
soliton wavelength tuning but also soltion pulse width variation could be
obtained in the fiber lasers. Our results show that the graphene mode locked
erbium-doped fiber lasers provide a compact, user friendly and low cost
wavelength tunable ultrahsort pulse source
Long-distant contribution and radiative decays to light vector meson
The discrepancy between the PQCD calculation and the CLEO data for
() stimulates our interest in
exploring extra mechanism of decay. In this work, we apply an
important non-perturbative QCD effect, i.e., hadronic loop mechanism, to study
radiative decay. Our numerical result shows that the
theoretical results including the hadronic loop contribution and the PQCD
calculation of are consistent with the corresponding
CLEO data of . We expect further experimental
measurement of at BES-III, which will be helpful to
test the hadronic loop effect on decay.Comment: 7 pages, 2 figures. Accepted for publication in Eur. Phys. J.
Local disorder and optical properties in V-shaped quantum wires : towards one-dimensional exciton systems
The exciton localization is studied in GaAs/GaAlAs V-shaped quantum wires
(QWRs) by high spatial resolution spectroscopy. Scanning optical imaging of
different generations of samples shows that the localization length has been
enhanced as the growth techniques were improved. In the best samples, excitons
are delocalized in islands of length of the order of 1 micron, and form a
continuum of 1D states in each of them, as evidenced by the sqrt(T) dependence
of the radiative lifetime. On the opposite, in the previous generation of QWRs,
the localization length is typically 50 nm and the QWR behaves as a collection
of quantum boxes. These localization properties are compared to structural
properties and related to the progresses of the growth techniques. The presence
of residual disorder is evidenced in the best samples and explained by the
separation of electrons and holes due to the large in-built piezo-electric
field present in the structure.Comment: 8 figure
Genome-wide association study for Atopy and Allergic Rhinitis in a Singapore Chinese population
10.1371/journal.pone.0019719PLoS ONE65
From graphene and topological insulators to Weyl semimetals
Here we present a short introduction into physics of Dirac materials. In particular we
review main physical properties of various two-dimensional crystals such as graphene, sil-
icene, germanene and others.We comment on the origin of their buckled two-dimensional
shape, and address the issues created by Mermin-Wagner theorem prohibiting the exis-
tence of strictly two-dimensional,
at crystals. Then we describe main ideas which were
leading to the discovery of two and three-dimensional topological insulators and Weyl
fermions. We describe some of their outstanding electronic properties which have been
originating due to the existence of the Dirac gapless spectrum. We also compare simplest
devices made of Dirac materials. Analogies and di erences between Dirac materials and
optics are also discussed
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