3,533 research outputs found
What went wrong with: "The Interaction of Neutrons With 7Be: "Lack of Standard Nuclear Physics Solution to the "Primordial 7Li Problem"", by M. Gai [arXiv:1812.09914v1]?
We comment here on results of the project aimed at measuring the 7Be(n,x)
reactions at SARAF, Israel, in 2016, posted by M. Gai in [arXiv:1812.09914v1]
without the knowledge of parts of the collaboration and against the explicit
veto of the collaborators and the administration of the Paul Scherrer Institut,
Switzerland. We address both the experimental shortcomings and the drawbacks in
project conduction. M. Gais preprint is labeled as "on behalf of the SARAF
Israel-US-Switzerland Collaboration", the author list is given as a reference
to another unpublished contribution (cited as [27]) to the NPA8 conference in
June 2017 in Catania). However, M. Gai did never have the right to report on
unpublished proprietary data of the entire collaboration, and he was not
authorized to act "on behalf of the collaboration". The contribution is
declared as "accepted for publication", but in fact was retracted during the
refereeing process. After several careful data evaluations, we have to state
that the results of these measurements are not trustworthy and neither the
given experimental data basis nor the corresponding data analysis can be
improved further. Therefore, we requested to retract the posting immediately
[arXiv:1904.03023]. We have to emphasize that, in our opinion, arXiv is not the
appropriate platform for handling frictions in a collaboration. These problems
should have been solved internally before publishing. Unfortunately, with his
single-handed posting against the explicit disagreement of parts of the
collaboration, M. Gai did not leave another possibility. With the present
article, we expressed all our concerns and objections and we consider herewith
the public discussion of this issue as closed.Comment: arXiv admin note: This version has been removed by arXiv
administrators due to copyright infringemen
Approximate analysis of thermal convection in a crystal-growth cell for Spacelab 3
The transient and steady thermal convection in microgravity is described. The approach is applicable to many three dimensional flows in containers of various shapes with various thermal gradients imposed. The method employs known analytical solutions to two dimensional thermal flows in simpler geometries, and does not require recourse to numerical calculations by computer
Research on the design of adaptive control systems, volume 1 Final report
Adaptive control systems - combined optimization and adaptive control, analysis-synthesis and passive adaptive systems, learning systems, and measurement adaptive system
Sudbury project (University of Muenster-Ontario Geological Survey): Sr-Nd in heterolithic breccias and gabbroic dikes
One major objective of our Sudbury project was to define origin and age of the huge breccia units below and above the Sudbury Igneous Complex (SIC). The heterolithic Footwall Breccia (FB) represents a part of the uplifted crater floor. It contains subrounded fragments up to several meters in size and lithic fragments with shock features (greater than 10 GPa) embedded into a fine- to medium-grained matrix. Epsilon(sub Nd)-epsilon(sub Sr) relationships point to almost exclusively parautochthonous precursor lithologies. The different textures of the matrix reflect the metamorphic history of the breccia layer; thermal annealing by the overlying hot impact melt sheet (SIC) at temperatures greater than 1000 C resulted in melting of the fine crushed material, followed by an episode of metasomatic K-feldspar growth and, finally, formation of low-grade minerals such as actinolite and chlorite. Isotope relationships in the Onaping breccias (Gray and Green Member) are much more complex. All attempts to date the breccia formation failed: Zircons are entirely derived from country rocks and lack the pronounced Pb loss caused by the heat of the slowly cooling impact melt sheet (SIC). Rb-Sr techniques using either lithic fragments of different shock stages or the thin slab method, set time limits for the apparently pervasive alkali mobility in these suevitic breccias. The data array and the intercept in the plots point to a major Rb-Sr fractionation around 1.54 Ga ago. This model age is in the same range as the age obtained for the metasomatic matrix of the FB. Rb-Sr dating of a shock event in impact-related breccias seems to be possible only if their matrix had suffered total melting by the hot melt sheet (FB) or if they contain a high fraction of impact melt (suevitic Onaping breccias), whereas the degree of shock metamorphism in rock or lithic fragments plays a minor role. In the Sudbury case, however, the impact melt in the seuvitic breccias is devitrified and recrystallized, which changed Rb/Sr ratios quite drastically. Therefore, the Onaping breccias give only age limits for alteration and low-grade metamorphism. The Sm-Nd system was not reset during the Sudbury event; clasts as well as the matrix in the FB and in the Onaping breccias show preimpact 'Archean' Nd isotope signatures
Evolution of the Rate and Mode of Star Formation in Galaxies since z=0.7
We present the star formation rate (SFR) and starburst fraction (SBF) for a
sample of field galaxies from the ICBS intermediate-redshift cluster survey. We
use [O II] and Spitzer 24 micron fluxes to measure SFRs, and 24 micron fluxes
and H-delta absorption to measure of SBFs, for both our sample and a
present-epoch field sample from the Sloan Digital Sky Survey (SDSS) and Spitzer
Wide-area Infrared Extragalactic (SWIRE) survey. We find a precipitous decline
in the SFR since z=1, in agreement with other studies, as well as a
corresponding rapid decline in the fraction of galaxies undergoing
long-duration moderate-amplitude starbursts. We suggest that the change in both
the rate and mode of star formation could result from the strong decrease since
z=1 of gas available for star formation.Comment: ApJ Letters in pres
Supporting systematic, scoping and other types of reviews: Workshops and services offered by the Medical Library at Charité
Medical Libraries have become central in evidence synthesis conduct – an evolving field. The Medical Library at Charité initiated Systematic/Scoping Reviews, an eight-part workshop series designed to provide comprehensive education and guidance on systematic and scoping review methods. Each session covers a specific step of the review process and offers participants who are conducting a review active engagement in these methodological steps using their own review question. This article provides a summary of each workshop session, outlining preparation requirements, workshop content, and challenges faced by both learners and the teaching team. The course has been well received by participants and has proven to be a valuable complement to the other health information literacy trainings offered by the Medical Library
A Lensed Arc in the Low Redshift Cluster Abell 2124
We report the discovery of an arc-like object 27" from the center of the cD
galaxy in the redshift cluster A2124. Observations with the Keck II
telescope reveal that the object is a background galaxy at ,
apparently lensed into an arc of length \sim 8 \farcs5 and total R magnitude
. The width of the arc is resolved; we estimate it to be
0\farcs6 after correcting for seeing. A lens model of the A2124 core mass
distribution consistent with the cluster galaxy velocity dispersion reproduces
the observed arc geometry and indicates a magnification factor \gta 9. With
this magnification, the strength of the [OII] \lambda 3727 line implies a
star-formation rate of SFR \sim 0.4 h^{-2}\msun yr^{-1}$. A2124 thus appears to
be the lowest redshift cluster known to exhibit strong lensing of a distant
background galaxy.Comment: 6 pages using emulateapj.sty; 4 Postscript figures; Figure 4 uses
color. Accepted for publication, but ApJ Letters' new policy of counting data
images makes the manuscript too long; will appear in main journal. This final
version has minor correction
The role of E+A and post-starburst galaxies – II. Spectral energy distributions and comparison with observations
‘The definitive version is available at www3.interscience.wiley.com '. Copyright Royal Astronomical Society. DOI: 10.1111/j.1365-2966.2009.15036.xIn a previous paper, we have shown that the classical definition of E+A galaxies excludes a significant number of post-starburst galaxies. We suggested that analysing broad-band spectral energy distributions (SEDs) is a more comprehensive method to select and distinguish post-starburst galaxies than the classical definition of measuring equivalent widths of (Hδ) and [O ii] lines. In this paper, we will carefully investigate this new method and evaluate it by comparing our model grid of post-starburst galaxies to observed E+A galaxies from the MORPHS catalogue. In the first part, we investigate the UV-optical-NIR (near-infrared) SEDs of a large variety in terms of progenitor galaxies, burst strengths and time-scales of post-starburst models and compare them to undisturbed spiral, S0 and E galaxies as well as to galaxies in their starburst phase. In the second part, we compare our post-starburst models with the observed E+A galaxies in terms of Lick indices, luminosities and colours. We then use the new method of comparing the model SEDs with SEDs of the observed E+A galaxies. We find that the post-starburst models can be distinguished from undisturbed spiral, S0 and E galaxies and galaxies in their starburst phase on the basis of their SEDs. It is even possible to distinguish most of the different post-starbursts by their SEDs. From the comparison with observations, we find that all observed E+A galaxies from the MORPHS catalogue can be matched by our models. However, only models with short decline time-scales for the star formation rate are possible scenarios for the observed E+A galaxies in agreement with our results from the first paper.Peer reviewe
Evolution since z = 0.5 of the Morphology-Density relation for Clusters of Galaxies
Using traditional morphological classifications of galaxies in 10
intermediate-redshift (z~0.5) clusters observed with WFPC-2 on the Hubble Space
Telescope, we derive relations between morphology and local galaxy density
similar to that found by Dressler for low-redshift clusters. Taken
collectively, the `morphology-density' relationship, M-D, for these more
distant, presumably younger clusters is qualitatively similar to that found for
the local sample, but a detailed comparison shows two substantial differences:
(1) For the clusters in our sample, the M-D relation is strong in centrally
concentrated ``regular'' clusters, those with a strong correlation of radius
and surface density, but nearly absent for clusters that are less concentrated
and irregular, in contrast to the situation for low redshift clusters where a
strong relation has been found for both. (2) In every cluster the fraction of
elliptical galaxies is as large or larger than in low-redshift clusters, but
the S0 fraction is 2-3 times smaller, with a proportional increase of the
spiral fraction. Straightforward, though probably not unique, interpretations
of these observations are (1) morphological segregation proceeds
hierarchically, affecting richer, denser groups of galaxies earlier, and (2)
the formation of elliptical galaxies predates the formation of rich clusters,
and occurs instead in the loose-group phase or even earlier, but S0's are
generated in large numbers only after cluster virialization.Comment: 35 pages, 19 figures, uses psfig. Accepted for publication in Ap
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