1,032 research outputs found
Avalanche to streamer transition in particle simulations
The avalanche to streamer transition is studied and illustrated in a particle
model. The results are similar to those of fluid models. However, when
super-particles are introduced, numerical artefacts become visible. This
underscores the need of models that are hybrid in space.Comment: 2 pages, 1 figur
Role of CD56 in Normal Kidney Development and Wilms Tumorigenesis
The cell-surface glycoprotein CD56 has three major isoforms that play important roles in cell adhesion and signaling, which may promote cell proliferation, differentiation, survival, or migration. It is an important molecule in normal kidney development and acts as a key marker in Wilms tumor stem and progenitor cells. Here, we review the structural and genetic features of the CD56 glycoprotein, and summarize its roles in the normal versus diseased metanephric blastema. We discuss areas of CD56-related research that may complement or improve existing Wilms tumor treatment strategies, including the antibody-drug conjugate lorvotuzumab mertansine that binds to CD56
The Structure of Nuclear Star Clusters in Nearby Late-type Spiral Galaxies from Hubble Space Telescope Wide Field Camera 3 Imaging
We obtained Hubble Space Telescope/Wide Field Camera 3 imaging of a sample of
ten of the nearest and brightest nuclear clusters residing in late-type spiral
galaxies, in seven bands that span the near-ultraviolet to the near-infrared.
Structural properties of the clusters were measured by fitting two-dimensional
surface brightness profiles to the images using GALFIT. The clusters exhibit a
wide range of structural properties. For six of the ten clusters in our sample,
we find changes in the effective radius with wavelength, suggesting radially
varying stellar populations. In four of the objects, the effective radius
increases with wavelength, indicating the presence of a younger population
which is more concentrated than the bulk of the stars in the cluster. However,
we find a general decrease in effective radius with wavelength in two of the
objects in our sample, which may indicate extended, circumnuclear star
formation. We also find a general trend of increasing roundness of the clusters
at longer wavelengths, as well as a correlation between the axis ratios of the
NCs and their host galaxies. These observations indicate that blue disks
aligned with the host galaxy plane are a common feature of nuclear clusters in
late-type galaxies, but are difficult to detect in galaxies that are close to
face-on. In color-color diagrams spanning the near-UV through the near-IR, most
of the clusters lie far from single-burst evolutionary tracks, showing evidence
for multi-age populations. Most of the clusters have integrated colors
consistent with a mix of an old population (> 1 Gyr) and a young population
(~100-300 Myr). The wide wavelength coverage of our data provides a sensitivity
to populations with a mix of ages that would not be possible to achieve with
imaging in optical bands only.Comment: Corrected a typo in author name and affiliation for MC and corrected
a typo in the conclusio
Teacher Learning from Professional Learning Communities:A Case Analysis of Interaction Patterns
Probing the AGN Unification Model at redshift z 3 with MUSE observations of giant Ly nebulae
A prediction of the classic active galactic nuclei (AGN) unification model is
the presence of ionisation cones with different orientations depending on the
AGN type. Confirmations of this model exist for present times, but it is less
clear in the early Universe. Here, we use the morphology of giant Ly
nebulae around AGNs at redshift z3 to probe AGN emission and therefore
the validity of the AGN unification model at this redshift. We compare the
spatial morphology of 19 nebulae previously found around type I AGNs with a new
sample of 4 Ly nebulae detected around type II AGNs. Using two
independent techniques, we find that nebulae around type II AGNs are more
asymmetric than around type I, at least at radial distances ~physical kpc
(pkpc) from the ionizing source. We conclude that the type I and type II AGNs
in our sample show evidence of different surrounding ionising geometries. This
suggests that the classical AGN unification model is also valid for
high-redshift sources. Finally, we discuss how the lack of asymmetry in the
inner parts (r30 pkpc) and the associated high values of the HeII to
Ly ratios in these regions could indicate additional sources of (hard)
ionizing radiation originating within or in proximity of the AGN host galaxies.
This work demonstrates that the morphologies of giant Ly nebulae can be
used to understand and study the geometry of high redshift AGNs on
circum-nuclear scales and it lays the foundation for future studies using much
larger statistical samples.Comment: 15 pages, 13 figures, accepted for publication in MNRA
Onderhoudsvoorkeuren in de sociale huursector:een onderzoek naar differentiatie in onderhoudsvoorkeuren van bewoners van sociale meergezinshuurwoningen
Teacher Learning from Professional Learning Communities:A Case Analysis of Interaction Patterns
Teachersβ positioning towards an educational innovation in the light of ownership, sense-making and agency
The positioning of eleven teachers towards an innovation was studied in the light of ownership, sense-making and agency. Semi-structured and video-stimulated interviews were used for data collection. The findings show that these three concepts are useful for describing similarities and differences between teachers in terms of their positioning towards the innovation. Considerable differences were found between teachers regarding their ownership, sense-making, and agency. Exploring the relations between these concepts revealed that a high degree of agency often went together with a high degree of ownership, but seemed to be moderated by the sense-making proces
ΠΡΠΎΡΠΎΠ²ΠΎ-ΠΊΡΠ΅Π΄ΠΈΡΠ½Π° ΡΠΈΡΡΠ΅ΠΌΠ° Π‘ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ Π¨ΡΠ°ΡΡΠ² ΠΠΌΠ΅ΡΠΈΠΊΠΈ
Π£ ΡΡΠ°ΡΡΡ ΡΠΎΠ·Π³Π»ΡΠ΄Π°ΡΡΡΡΡ ΠΏΡΠΎΠ±Π»Π΅ΠΌΠΈ ΡΡΠ½ΠΊΡΡΠΎΠ½ΡΠ²Π°Π½Π½Ρ Π³ΡΠΎΡΠΎΠ²ΠΎ-ΠΊΡΠ΅Π΄ΠΈΡΠ½ΠΎΡ ΡΠΈΡΡΠ΅ΠΌΠΈ Π‘ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ
Π¨ΡΠ°ΡΡΠ² ΠΠΌΠ΅ΡΠΈΠΊΠΈ β ΠΎΠ΄Π½ΡΡΡ Π· Π½Π°ΠΉΠ±ΡΠ»ΡΡ ΡΠΎΠ·Π²ΠΈΠ½Π΅Π½ΠΈΡ
ΠΊΡΠ°ΡΠ½ ΡΠ²ΡΡΡ. ΠΠ»ΡΡΠΎΠ²Ρ ΡΠ»ΠΎΠ²Π°: ΡΠ΅Π½ΡΡΠ°Π»ΡΠ½ΠΈΠΉ Π±Π°Π½ΠΊ, ΠΊΠΎΠΌΠ΅ΡΡΡΠΉΠ½Ρ Π±Π°Π½ΠΊΠΈ, Π½Π΅Π±Π°Π½ΠΊΡΠ²ΡΡΠΊΡ ΠΊΡΠ΅Π΄ΠΈΡΠ½Ρ ΡΡΡΠ°Π½ΠΎΠ²ΠΈ, Π³ΡΠΎΡΠΎΠ²Π° ΠΎΠ΄ΠΈΠ½ΠΈΡΡ, Π³ΡΠΎΡΠΎΠ²ΠΎ-ΠΊΡΠ΅Π΄ΠΈΡΠ½Π° ΡΠΈΡΡΠ΅ΠΌΠ°.Π ΡΡΠ°ΡΡΠ΅ ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°ΡΡΡΡ ΠΏΡΠΎΠ±Π»Π΅ΠΌΡ ΡΡΠ½ΠΊΡΠΈΠΎΠ½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π΄Π΅Π½Π΅ΠΆΠ½ΠΎ-ΠΊΡΠ΅Π΄ΠΈΡΠ½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΡ Π‘ΠΎΠ΅Π΄ΠΈΠ½Π΅Π½Π½ΡΡ
Π¨ΡΠ°ΡΠΎΠ² ΠΠΌΠ΅ΡΠΈΠΊΠΈ, ΠΎΠ΄Π½ΠΎΠΉ ΠΈΠ· Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ ΡΠ°Π·Π²ΠΈΡΡΡ
ΡΡΡΠ°Π½ ΠΌΠΈΡΠ°. ΠΠ»ΡΡΠ΅Π²ΡΠ΅ ΡΠ»ΠΎΠ²Π°: ΡΠ΅Π½ΡΡΠ°Π»ΡΠ½ΡΠΉ Π±Π°Π½ΠΊ, ΠΊΠΎΠΌΠΌΠ΅ΡΡΠ΅ΡΠΊΠΈΠ΅ Π±Π°Π½ΠΊΠΈ, Π½Π΅Π±Π°Π½ΠΊΠΎΠ²ΡΠΊΠΈΠ΅ ΠΊΡΠ΅Π΄ΠΈΡΠ½ΡΠ΅ ΡΡΡΠ΅ΠΆΠ΄Π΅Π½ΠΈΡ, Π΄Π΅Π½Π΅ΠΆΠ½Π°Ρ Π΅Π΄ΠΈΠ½ΠΈΡΠ°, Π΄Π΅Π½Π΅ΠΆΠ½ΠΎ-ΠΊΡΠ΅Π΄ΠΈΡΠ½Π°Ρ ΡΠΈΡΡΠ΅ΠΌΠ°.The problems of functioning of the money-andcredit United States of America are examined in the article, one of the most prosperous countries world. Key words: Central bank, commercial banken, nonbanken of credit institution, money unit, gold-credit system
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