4,927 research outputs found
DMP online: the Digital Curation Centre’s web-based tool for creating, maintaining and exporting data management plans
Funding bodies increasingly require researchers to produce Data Management Plans (DMPs). The Digital Curation Centre (DCC) has created DMP Online, a web-based tool which draws upon an analysis of funders’ requirements to enable researchers to create and export customisable DMPs, both at the grant application stage and during the project’s lifetime
IXIM: A new maize simulation model for DSSAT v4.5.
The Decision Support System for Agrotechnology Transfer (DSSAT) is a suite of crop simulation models and associated tools for simulating growth, development, and yield of 25 crops. The maize simulation model in DSSAT is CSM-CERES, the modular version of CERES-Maize, which was first published in 1986. The newest release of DSSAT, version 4.5, provides users with the opportunity to run an alternative maize simulation model. IXIM (eeh-sheem), the Mayan language for maize, is a new, more mechanistic, maize simulation model fully compatible with DSSAT. The purpose of this work is to compare seasonal simulations of maize growth and N uptake using CSM-CERES and IXIM
Controls on the standing crop of benthic foraminifera at an oceanic scale
Currently there is very little basin-scale information on patterns of standing crop in marine organisms or their structuring forces. Understanding modern patterns and controls on foraminifera is particularly critical because of their abundance and importance in benthic systems as well as their role as palaeoceanographic proxies. Here, we examine for the first time basin-scale patterns and predictors of benthic foraminiferal standing crop from shelf to abyssal deep sea in the Atlantic Ocean and adjacent seas using a large database of 967 quantitative samples. Spatial regression analyses reveal that the flux of particulate organic matter (POC) is a major control on standing crop size across all depths investigated, with increasing food supply increasing foraminiferal standing crops. Other factors also play a role. Dissolved oxygen is significant at slope depths and negatively related to standing crop. Temperature and possibly salinity are significant factors in the abyss. Dissolved silicate was important and positively related to standing crop in shelf seas, potentially indicating the importance of the nature of the organic material available. This study demonstrates that productivity is important in describing foraminiferal standing crop at a basin scale, supporting the use of paleoceanographic proxies, but also demonstrates that other environmental variables are also likely important in controlling the standing crop and should be considered in reconstruction of Earth’s past marine environment
Development of drainage assessment procedures based on physical features in Illinois
The objectives of this study were to identify the physical features of the land in a drainage district which influence benefits accruing from drainage improvements, and to formulate a method for distributing assessments based upon the relative importance of these physical features. The significant physical features discovered in the study were: (1) the distance from the tract of land to the main drain, (2) the distance from the tract of land to the main outlet, and (3) the permeability of the soil on the tract of land. An equation was developed to determine the assessment for any tract: An = 1,4845 - 0,3476 (Ln/L*) - 0.4680 (Dn/D*) - 0.4434 (Kn/K*). The equation provides a procedure and a computer program to equitably distribute drainage assessments with a savings in labor and time in the preparation of the assessment roll. This unbiased procedure should reduce the present objection of landowners of unfair assessments based upon p.ersona1 judgment. Although the present equation is limited to the geographic area that supplied the data for the coefficients, the procedure developed may be used to calculate coefficients for other soil and morphological areas.U.S. Department of the InteriorU.S. Geological SurveyOpe
Grid simulation services for the medical community
The first part of this paper presents a selection of medical simulation applications, including image reconstruction, near real-time registration for neuro-surgery, enhanced dose distribution calculation for radio-therapy, inhaled drug delivery prediction, plastic surgery planning and cardio-vascular system simulation. The latter two topics are discussed in some detail. In the second part, we show how such services can be made available to the clinical practitioner using Grid technology. We discuss the developments and experience made during the EU project GEMSS, which provides reliable, efficient, secure and lawful medical Grid services
Random quantum correlations and density operator distributions
Consider the question: what statistical ensemble corresponds to minimal prior
knowledge about a quantum system ? For the case where the system is in fact
known to be in a pure state there is an obvious answer, corresponding to the
unique unitarily-invariant measure on the Hilbert sphere. However, the problem
is open for the general case where states are described by density operators.
Here two approaches to the problem are investigated.
The first approach assumes that the system is randomly correlated with a
second system, where the ensemble of composite systems is described by a random
pure state. Results for qubits randomly correlated with other systems are
presented, including average entanglement entropies. It is shown that maximum
correlation is guaranteed in the limit as one system becomes
infinite-dimensional.
The second approach relies on choosing a metric on the space of density
operators, and generating a corresponding ensemble from the induced volume
element. Comparisons between the approaches are made for qubits, for which the
second approach (based on the Bures metric) yields the most symmetric, and
hence the least informative, ensemble of density operators.Comment: 13 pages, no figures; a new page of additional notes at end draws
attention to 3 new references and their relevanc
Specializing Interpreters using Offline Partial Deduction
We present the latest version of the Logen partial evaluation system for logic programs. In particular we present new binding-types, and show how they can be used to effectively specialise a wide variety of interpreters.We show how to achieve Jones-optimality in a systematic way for several interpreters. Finally, we present and specialise a non-trivial interpreter for a small functional programming language. Experimental results are also presented, highlighting that the Logen system can be a good basis for generating compilers for high-level languages
Effect of the Output of the System in Signal Detection
We analyze the consequences that the choice of the output of the system has
in the efficiency of signal detection. It is shown that the signal and the
signal-to-noise ratio (SNR), used to characterize the phenomenon of stochastic
resonance, strongly depend on the form of the output. In particular, the SNR
may be enhanced for an adequate output.Comment: 4 pages, RevTex, 6 PostScript figure
Calcium carbonate saturation states along the West Antarctic Peninsula
The waters along the West Antarctic Peninsula (WAP) have experienced warming and increased
freshwater inputs from melting sea ice and glaciers in recent decades. Challenges exist in understanding
the consequences of these changes on the inorganic carbon system in this ecologically important and
highly productive ecosystem. Distributions of dissolved inorganic carbon (CT), total alkalinity (AT)
and nutrients revealed key physical, biological and biogeochemical controls of the calcium carbonate
saturation state (Ωaragonite) in different water masses across the WAP shelf during the summer.
Biological production in spring and summer dominated changes in surface water Ωaragonite (ΔΩaragonite
up to +1.39; ∼90%) relative to underlying Winter Water. Sea-ice and glacial meltwater constituted a
minor source of AT that increased surface water Ωaragonite (ΔΩaragonite up to +0.07; ∼13%).
Remineralization of organic matter and an influx of carbon-rich brines led to cross-shelf decreases in
Ωaragonite in Winter Water and Circumpolar Deep Water. A strong biological carbon pump over the
shelf created Ωaragonite oversaturation in surface waters and suppression of Ωaragonite in subsurface
waters. Undersaturation of aragonite occurred at < ∼1000 m. Ongoing changes along the WAP will
impact the biologically driven and meltwater-driven processes that influence the vulnerability of shelf
waters to calcium carbonate undersaturation in the future
Quasi-Local Density Functional Theory and its Application within Extended Thomas-Fermi Approximation
A generalization of the Density Functional Theory is proposed. The theory
developed leads to single-particle equations of motion with a quasi-local
mean-field operator, which contains a quasi-particle position-dependent
effective mass and a spin-orbit potential. The energy density functional is
constructed using the Extended Thomas-Fermi approximation. Within the framework
of this approach the ground-state properties of the doubly magic nuclei are
considered. The calculations have been performed using the finite-range Gogny
D1S force. The results are compared with the exact Hartree-Fock calculations
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