13,889 research outputs found
Young children as citizens: learning from practice in the early childhood setting
This paper examines enactments of young children’s citizenship in early childhood settings in England, which is an under researched area, in this study young children are positioned as social actors, competent and capable of making decisions and enacting citizenship. Values, child rights and citizenship are interconnected and often inseparable in practice. A mixed methods multiple-case study was conducted in England across several early childhood settings in the private and independent sector. Our findings indicate that young children enact citizenship through micro acts embedded into their day-to-day activities; such acts are often spontaneous in response to events or interactions. These are often pro-social in nature comprised as behaviours such as helping or showing concern for others. Our findings give visibility to the distinctive ways in which young children may enact citizenship including, for example, physical expressions
Is friction responsible for the reduction of fusion rates far below the Coulomb barrier?
The fusion of two interacting heavy ions traditionally has been interpreted
in terms of the penetration of the projectile into the target. Observed rates
well below the Coulomb barrier are considerably lower than estimates obtained
from penetration factors. One approach in the analysis of the data invokes
coupling to non-elastic channels in the scattering as the source of the
depletion. Another is to analyze those data in terms of tunneling in
semi-classical models, with the observed depletion being taken as evidence of a
``friction'' under the barrier. A complementary approach is to consider such
tunneling in terms of a fully quantal model. We investigate tunneling with both
one-dimensional and three-dimensional models in a fully quantal approach to
investigate possible sources for such a friction. We find that the observed
phenomenon may not be explained by friction. However, we find that under
certain conditions tunneling may be enhanced or diminished by up to 50%, which
finds analogy with observation, without the invocation of a friction under the
barrier.Comment: 18 pages, 15 figures embedde
Measurement of and Higgs production in fusion at a 1.4 TeV CLIC collider
This paper presents the potential measurement at 1.4 TeV CLIC of the
cross-section (times branching ratio) of the Higgs production via fusion
with the Higgs subsequently decaying in ,
, and of the Higgs
production via fusion with the Higgs subsequently decaying in ,
. For the decay the hadronic final state, , and the semi-leptonic final state, , are considered. The results show that
can be measured
with a precision of 18.3% and 6% for the hadronic and semi-leptonic channel,
respectively. can be
measured with a precision of 1.7%. This measurement also contributes to the
determination of the Higgs coupling to the boson, .Comment: Talk presented at the International Workshop on Future Linear
Colliders (LCWS14), Belgrade, Serbia, 6-10 October 201
A FAMILY OF CATION ATPASE-LIKE MOLECULES FROM PLASMODIUM-FALCIPARUM
Abstract. We report the nucleotide and derived amino acid sequence of the ATPase 1 gene from Plasmodium falciparum. The amino acid sequence shares homology with the family of "P-type cation transloeating ATPases in conserved regions important for nucleotide binding, conformational change, or phosphorylation. The gene, which is present on chromosome 5, has a product longer than any other reported for a P-type ATPase. Interstrain analysis from 12 parasite isolates by the polymerase chain reaction reveals that a 330-bp nucleotide sequence encoding three cytoplasmic regions conserved in cation ATPases (regions a-c) is of constant length. By contrast, another 360-bp sequence which is one of four regions we refer to as
Electrometer system measures nanoamps at high voltage
Floating electrometer eliminates major source of error since any leakage from electrometer case, which is at high voltage, appears only as load on high voltage supply and not as part of current being measured. Commands to and data from floating electrometer are transferred across high voltage interface by means of optical channels
Local and Global Superconductivity in Bismuth
We performed magnetization M(H,T) and magnetoresistance R(T,H) measurements
on powdered (grain size ~ 149 micrometers) as well as highly oriented
rhombohedral (A7) bismuth (Bi) samples consisting of single crystalline blocks
of size ~ 1x1 mm2 in the plane perpendicular to the trigonal c-axis. The
obtained results revealed the occurrence of (1) local superconductivity in
powdered samples with Tc(0) = 8.75 \pm 0.05 K, and (2) global superconductivity
at Tc(0) = 7.3 \pm 0.1 K in polycrystalline Bi triggered by low-resistance
Ohmic contacts with silver (Ag) normal metal. The results provide evidence that
the superconductivity in Bi is localized in a tiny volume fraction, probably at
intergrain or Ag/Bi interfaces. On the other hand, the occurrence of global
superconductivity observed for polycrystalline Bi can be accounted for by
enhancement of the superconducting order parameter phase stiffness induced by
the normal metal contacts, the scenario proposed in the context of "pseudogap
regime" in cuprates [E. Berg et al., PRB 78, 094509 (2008)].Comment: 12 pages including 9 figures and 1 table, Special Issue to the 80th
birthday anniversary of V. G. Peschansky, Electronic Properties of Conducting
System
Transcriptional Targeting in Cancer Gene Therapy
Cancer gene therapy has been one of the most exciting areas of therapeutic research in the past decade. In this review, we discuss strategies to restrict transcription of transgenes to tumour cells. A range of promoters which are tissue-specific, tumour-specific, or inducible by exogenous agents are presented. Transcriptional targeting should prevent normal tissue toxicities associated with other cancer treatments, such as radiation and chemotherapy. In addition, the specificity of these strategies should provide improved targeting of metastatic tumours following systemic gene delivery. Rapid progress in the ability to specifically control transgenes will allow systemic gene delivery for cancer therapy to become a real possibility in the near future
- …