5,128 research outputs found
Data-driven Design of Engineering Processes with COREPROModeler
Enterprises increasingly demand IT support for the coordination of their engineering processes, which often consist of hundreds up to thousands of sub-processes. From a technical viewpoint, these sub-processes have to be concurrently executed and synchronized considering numerous interdependencies.
So far, this coordination has mainly been accomplished manually, which has resulted in errors and inconsistencies. In order to deal with this problem, we have to better understand the interdependencies between the subprocesses to be coordinated. In particular, we can benefit from the fact that sub-processes are often correlated to the assembly of a product (represented by a product data structure). This information can be utilized for the modeling and execution of so-called data-driven process structures. In this paper, we present the COREPRO demonstrator that supports the data-driven modeling of these process structures. The approach explicitly establishes a close linkage between product data structures and engineering processes
Towards quantum-chemical method development for arbitrary basis functions
We present the design of a flexible quantum-chemical method development
framework, which supports employing any type of basis function. This design has
been implemented in the light-weight program package molsturm, yielding a
basis-function-independent self-consistent field scheme. Versatile interfaces,
making use of open standards like python, mediate the integration of molsturm
with existing third-party packages. In this way both rapid extension of the
present set of methods for electronic structure calculations as well as adding
new basis function types can be readily achieved. This makes molsturm
well-suitable for testing novel approaches for discretising the electronic wave
function and allows comparing them to existing methods using the same software
stack. This is illustrated by two examples, an implementation of
coupled-cluster doubles as well as a gradient-free geometry optimisation, where
in both cases, an arbitrary basis functions could be used. molsturm is
open-source and can be obtained from https://molsturm.org.Comment: 15 pages and 7 figure
Interstellar water chemistry: from laboratory to observations
Water is observed throughout the universe, from diffuse interstellar clouds
to protoplanetary disks around young stars, and from comets in our own solar
system and exoplanetary atmospheres to galaxies at high redshifts. This review
summarizes the spectroscopy and excitation of water in interstellar space as
well as the basic chemical processes that form and destroy water under
interstellar conditions. Three major routes to water formation are identified:
low temperature ion-molecule chemistry, high-temperature neutral-neutral
chemistry and gas-ice chemistry. The rate coefficients of several important
processes entering the networks are discussed in detail; several of them have
been determined only in the last decade through laboratory experiments and
theoretical calculations. Astronomical examples of each of the different
chemical routes are presented using data from powerful new telescopes, in
particular the Herschel Space Observatory. Basic chemical physics studies
remain critically important to analyze astronomical data.Comment: Authors' manuscript 138 pages, 34 figures, 4 tables, published in a
Thematic Issue "Astrochemistry" in Chemical Reviews (December 2013), volume
113, 9043-9085 following peer review by the American Chemical Society. The
published paper is available as open access at
http://pubs.acs.org/doi/abs/10.1021/cr400317
The Arecibo Galaxy Environment Survey VIII : Discovery of an Isolated Dwarf Galaxy in the Local Volume
The Arecibo Galaxy Environment Survey (AGES) has detected a nearby HI source
at a heliocentric velocity of +363 km/s . The object was detected through its
neutral hydrogen emission and has an obvious possible optical counterpart in
Sloan Digital Sky Survey (SDSS) data (though it does not have an optical
redshift measurement). We discuss three possible scenarios for the object : 1)
It is within the Local Group, in which case its HI properties are comparable
with recently discovered ultra-compact high velocity clouds; 2) It is just
behind the Local Group, in which case its optical characteristics are similar
to the newly discovered Leo P galaxy; 3) It is a blue compact dwarf galaxy
within the local volume but not associated with the Local Group. We find the
third possibility to be the most likely, based on distance estimates from the
Tully-Fisher relation and its velocity relative to the Local Group.Comment: 5 pages, 6 figures, accepted for publication in MNRAS. Minor
correction to institution and addres
Electron-attachment rates for carbon-rich molecules in protoplanetary atmospheres: the role of chemical differences
The formation of anionic species in the interstellar medium from interaction
of linear molecules containing carbon, nitrogen and hydrogen as atomic
components (polyynes) with free electrons in the environment is modelled via a
quantum treatment of the collision dynamics. The ensuing integral cross
sections are employed to obtain the corresponding attachment rates over a broad
range of temperatures for the electrons. The calculations unequivocally show
that a parametrization form often employed for such rates yields a broad range
of values that turn out to be specific for each molecular species considered,
thus excluding using a unique set for the whole class of polyynes.Comment: accepted to be published on MNRA
Electron attachment rates for PAH anions in the ISM and dark molecular clouds: dependence on their chemical properties
CONTEXT: The attachment of free electrons to polycondensed aromatic ring
molecules (PAHs) is studied for the variety of these molecules with different
numbers of condensed rings and over a broad range of electron temperatures,
using a multichannel quantum scattering approach. The calculations of the
relevant cross sections are used in turn to model the corresponding attachment
rates for each of the systems under study, and these rates are parametrized as
a function of temperature using a commonly employed expression for two-body
processes in the interstellar medium (ISM). AIM: The scope of this work is to
use first principles to establish the influence of chemical properties on the
efficiency of the electron-attachment process for PAHs. METHODS: Quantum
multichannel scattering methods are employed to generate the relevant cross
sections, hence the attachment rates, using integral elastic cross sections
computed over a broad range of relevant energies, from threshold up to 1000 K
and linking the attachment to low-energy resonant collisions. RESULTS: The
rates obtained for the present molecules are found to markedly vary within the
test ensemble of the present work and to be lower than the earlier values used
for the entire class of PAHs anions, when modelling their evolutions in ISM
environments. The effects of such differences on the evolutions of chemical
networks that include both PAH and PAH- species are analysed in some detail and
related to previous calculations.Comment: accepted to be published on A&
LIINUS/SERPIL: a design study for interferometric imaging spectroscopy at the LBT
LIINUS/SERPIL is a design study to augment LBTs interferometric beam combiner
camera LINC-NIRVANA with imaging spectroscopy. The FWHM of the interferometric
main beam at 1.5 micron will be about 10 mas, offering unique imaging and
spectroscopic capabilities well beyond the angular resolution of current 8-10m
telescopes. At 10 mas angular scale, e.g., one resolution element at the
distance of the Galactic Center corresponds to the average diameter of the
Pluto orbit (79 AU), hence the size of the solar system. Taking advantage of
the LBT interferometric beam with an equivalent maximum diameter of 23 m,
LIINUS/SERPIL is an ideal precursor instrument for (imaging) spectrographs at
extremely large full aperture telescopes. LIINUS/SERPIL will be built upon the
LINC-NIRVANA hardware and LIINUS/SERPIL could potentially be developed on a
rather short timescale. The study investigates several concepts for the optical
as well as for the mechanical design. We present the scientific promises of
such an instrument together with the current status of the design study.Comment: 12 pages, SPIE conference proceeding, Orlando, 200
The Arecibo Galaxy Environment Survey VII : A Dense Filament With Extremely Long HI Streams
We present completed observations of the NGC 7448 galaxy group and background
volume as part of the blind neutral hydrogen Arecibo Galaxy Environment Survey
(AGES). Our observations cover a region spanning 5x4 degrees, over a redshift
range of approximately -2,000 < cz < 20,000 km/s. A total of 334 objects are
detected, mostly in three overdensities at cz 7,500, cz 9,600 and
cz 11,400 km/s. The galaxy density is extremely high (15 per square
degree) and many (24%) show signs of extended HI emission, including some
features as much as 800 kpc in projected length. We describe the overall
characteristics of this environment : kinematics, typical galaxy colours and
mass to light ratios, and substructure. To aid in the cataloguing of this data
set, we present a new FITS viewer (FRELLED : Fits Realtime Explorer of Low
Latency in Every Dimension). This incorporates interactive source cataloguing
tools which increase our source extraction speed by approximately a factor of
50.Comment: 15 pages, 13 figures, accepted for publication in MNRA
The spectral type of CHS7797 - an intriguing very low mass periodic variable in the Orion Nebula Cluster
We present the spectroscopic characterization of the unusual high-amplitude
very low mass pre-main-sequence periodic variable CHS7797. This study is based
on optical medium-resolution (R=2200) spectroscopy in the 6450-8600 A range,
carried out with GMOS-GEMINI-S in March 2011. Observations of CHS7797 have been
carried out at two distinct phases of the 17.8d period, namely at maximum and
four days before maximum. Four different spectral indices were used for the
spectral classification at these two phases, all of them well-suited for
spectral classification of young and obscured late M dwarfs. In addition, the
gravity-sensitive NaI (8183/8195 A) and KI (7665/7699 A) doublet lines were
used to confirm the young age of CHS7797. From the spectrum obtained at maximum
light we derived a spectral type (SpT) of M6.05, while for the spectrum taken
four days before maximum the derived SpT is M5.75. The derived SpTs confirm
that CHS7797 has a mass in the stellar-substellar boundary mass range. In
addition, the small differences in the derived SpTs at the two observed phases
may provide indirect hints that CHS7797 is a binary system of similar mass
components surrounded by a tilted circumbinary disk, a system similar to KH15D.Comment: 6 pages, accepted for publication A&
Sensitivity of the deuteron form factor to nucleon resonances
The sensitivity of the deuteron form factor to contributions from the excited states of the nucleon is explored using a simple model of the nucleon-nucleon interaction which employs a tower of charged nucleon resonances. The model is manifestly covariant, analytically solvable, and gauge invariant. The consequences of this model are studied in the simplest possible framework. We assume that all particles have spin zero and that the tower has only three charged members, which consist of the proton, the Roper, and a higher state in the vicinity of the . Nucleon-nucleon S-wave phase shifts and the deuteron form factor are calculated using this three member tower, and the results are compared to similar calculations using the proton ground state only. We conclude that the deuteron form factor is insensitive to the presence of excited states of the proton unless those states are of sufficiently low mass to produce strong inelasticities in scattering channels
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