Unconvergence of very-large-scale giant impact simulations

The R-package MoBPS provides a computationally efficient and flexible framework to simulate complex breeding programs and compare their economic and genetic impact. Simulations are performed on the base of individuals. MoBPS utilizes a highly efficient implementation with bit-wise data storage and matrix multiplications from the associated R-package miraculix allowing to handle large scale populations. Individual haplotypes are not stored but instead automatically derived based on points of recombination and mutations. The modular structure of MoBPS allows to combine rather coarse simulations, as needed to generate founder populations, with a very detailed modeling of todays’ complex breeding programs, making use of all available biotechnologies. MoBPS provides pre-implemented functions for common breeding practices such as optimum genetic contributions and single-step GBLUP but also allows the user to replace certain steps with personalized and/or self-written solutions.

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The giant impact simulations with density independent smoothed particle hydrodynamics

Icarus ◽

10.1016/j.icarus.2016.01.036 ◽

2016 ◽

Vol 271 ◽

pp. 131-157 ◽

Cited By ~ 19

Author(s):

Natsuki Hosono ◽

Takayuki R. Saitoh ◽

Junichiro Makino ◽

Hidenori Genda ◽

Shigeru Ida

Keyword(s):

Smoothed Particle Hydrodynamics ◽

Giant Impact ◽

Particle Hydrodynamics ◽

Smoothed Particle ◽

Impact Simulations

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Lunar-forming impacts: processes and alternatives

Philosophical Transactions of The Royal Society A Mathematical Physical and Engineering Sciences ◽

10.1098/rsta.2013.0175 ◽

2014 ◽

Vol 372 (2024) ◽

pp. 20130175 ◽

Cited By ~ 22

Author(s):

R. M. Canup

Keyword(s):

Angular Momentum ◽

Large Scale ◽

Early Earth ◽

The Sun ◽

Initial Composition ◽

High Angular Momentum ◽

Giant Impact ◽

Earth’S Mantle ◽

Momentum Loss ◽

Angular Momentum Loss

The formation of a protolunar disc by a giant impact with the early Earth is discussed, focusing on two classes of impacts: (i) canonical impacts, in which a Mars-sized impactor produces a planet–disc system whose angular momentum is comparable to that in the current Earth and Moon, and (ii) high-angular-momentum impacts, which produce a system whose angular momentum is approximately a factor of 2 larger than that in the current Earth and Moon. In (i), the disc originates primarily from impactor-derived material and thus is expected to have an initial composition distinct from that of the Earth's mantle. In (ii), a hotter, more compact initial disc is produced with a silicate composition that can be nearly identical to that of the silicate Earth. Both scenarios require subsequent processes for consistency with the current Earth and Moon: disc–planet compositional equilibration in the case of (i), or large-scale angular momentum loss during capture of the newly formed Moon into the evection resonance with the Sun in the case of (ii).

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Constraining hydrological impact simulations over Europe through weighting the climatic forcing

10.5194/egusphere-egu2020-15892 ◽

2020 ◽

Author(s):

Peter Greve ◽

Peter Burek ◽

Renate Wilcke ◽

Lukas Brunner ◽

Carol McSweeney ◽

...

Keyword(s):

Input Data ◽

Large Scale ◽

Climate Models ◽

Climate Model ◽

Regional Climate ◽

Regional Climate Models ◽

Hydrological Impact ◽

Model Ensembles ◽

Hydrological Extreme ◽

Impact Simulations

<p><span>Global hydrological models (GHMs) have become an established tool to simulate water resources on continental scales. To assess the future of water availability and various impacts related to hydrological extreme events, these models usually use sets of atmospheric variables (such as e.g., precipitation, humidity, temperature) obtained from (regional) climate model simulations as input data. The uncertainty associated with the climate projections is transferred onwards into the impact simulations and is usually accounted for through the use of large model ensembles. These ensembles thus enable assessments addressing the robustness of projected hydrological changes and impacts. Given recent efforts within the European Climate Prediction (EUCP) project to test existing and develop new techniques to constrain/weight climate model ensembles, we use here different methods to specify the large-scale meteorological input to an ensemble of regional climate models that provide the input data for a state-of-the-art GHM. The climate models are weighted/constrained based on the key large-scale climatic and meteorological drivers shaping the hydrological characteristics in different regions and large river basins across Europe. To assess the potential benefits of the different techniques, we compare simulation ensembles using unweighted input data obtained from the full ensemble of regional climate models against an ensemble based on constrained/weighted forcing data. Given the large uncertainties usually associated with hydrological impact simulations forced by the full range of available climate models, processing the ensemble output of GHMs based on uncertainty assessments of the underlying climate forcing could lead to more robust projections of water resources in general and hydrological extreme events in particular. </span></p>

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Parallel performance of large scale impact simulations on Linux cluster super computer

Computers & Structures ◽

10.1016/j.compstruc.2005.11.013 ◽

2006 ◽

Vol 84 (10-11) ◽

pp. 732-741 ◽

Cited By ~ 16

Author(s):

Seung Hoon Paik ◽

Ji Joong Moon ◽

Seung Jo Kim ◽

M. Lee

Keyword(s):

Large Scale ◽

Parallel Performance ◽

Super Computer ◽

Linux Cluster ◽

Impact Simulations

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Facilitating Circular Economy in Urban Planning

Urban Planning ◽

10.17645/up.v4i3.2484 ◽

2019 ◽

Vol 4 (3) ◽

pp. 1-4 ◽

Cited By ~ 7

Author(s):

Hilde Remøy ◽

Alexander Wandl ◽

Denis Ceric ◽

Arjan Van Timmeren

Keyword(s):

Urban Planning ◽

Built Environment ◽

Circular Economy ◽

Large Scale ◽

Environmental Benefits ◽

Management Options ◽

First Results ◽

Decision Environment ◽

Future Demands ◽

Impact Simulations

A shift towards a more Circular Economy is crucial to achieve a more sustainable and inclusive built environment that meets future demands. Circular Economy is a promising concept for industry and society. If implemented well, Circular Economy can deliver environmental benefits and economic advantages for which innovation is essential. To achieve a resource-efficient built environment the Circular Economy should be developed and implemented systemically and on a large scale, going beyond cities. To realise this, local authorities, citizens, and other stakeholders need a collaborative and science-informed decision environment that allows for developing different waste and resource management options, and assessing their impacts on the environment, resilience, spatial quality and quality of life. The articles in this special issue all discuss different aspects of research to deliver solutions and strategies for a circular economy in urban planning throughout Europe, focusing on peri-urban locations. The first rticle introduces Living Labs as a methodology to co-create circular solutions and strategies with local stakeholders. The second article focuses on governance for the shift towards a Circular Economy, unravelling hindrances and revealing objectives, whereas the third article develops a means to transfer circular strategies and solutions from one location to another. The fourth article presents an open-source tool based on the geodesign approach which links the co-creation of design proposals to impact simulations informed by geographic contexts, systems thinking, and digital technology—the Geodesign Decision Support Environment. Finally, the fifth article presents the first results of incorporating the concept of Circular Economy in an integrative manner in urban design and planning courses.

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MoBPS - Modular Breeding Program Simulator

10.1101/829333 ◽

2019 ◽

Cited By ~ 3

Author(s):

T. Pook ◽

M. Schlather ◽

H. Simianer

Keyword(s):

Large Scale ◽

R Package ◽

Single Step ◽

Computationally Efficient ◽

Breeding Programs ◽

Genetic Impact ◽

Founder Populations ◽

Flexible Framework ◽

Genetic Contributions ◽

Impact Simulations

ABSTRACTThe R-package MoBPS provides a computationally efficient and flexible framework to simulate complex breeding programs and compare their economic and genetic impact. Simulations are performed on the base of individuals and haplotypes are calculated on-the-fly by only saving founder haplotypes, points of recombination and mutations. MoBPS utilizes a highly efficient implementation with bit-wise storage of data and matrix multiplications from the associated R-package miraculix allowing to handle large scale populations. The modular structure of MoBPS allows to combine rather coarse simulations, as needed to generate founder populations, with a very detailed modeling of todays’ complex breeding programs, making use of all available biotechnologies. MoBPS provides pre-implemented functions for common breeding practices such as optimum genetic contributions and single-step GBLUP but also allows the user to replace certain steps with personalized and/or self-written solutions.

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Enhanced Mixing in Giant Impact Simulations with a New Lagrangian Method

The Astrophysical Journal ◽

10.3847/1538-4357/aaf399 ◽

2019 ◽

Vol 870 (2) ◽

pp. 127 ◽

Cited By ~ 8

Author(s):

Hongping Deng ◽

Christian Reinhardt ◽

Federico Benitez ◽

Lucio Mayer ◽

Joachim Stadel ◽

...

Keyword(s):

Lagrangian Method ◽

Giant Impact ◽

Impact Simulations

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Some comments about observations and image processing of comet 29P/Schwassmann-Wachmann 1

International Astronomical Union Colloquium ◽

10.1017/s0252921100031493 ◽

1999 ◽

Vol 173 ◽

pp. 243-248

Author(s):

D. Kubáček ◽

A. Galád ◽

A. Pravda

Keyword(s):

Image Processing ◽

Large Scale ◽

Harvard College ◽

Oak Ridge ◽

Large Scale Structures ◽

Short Period Comet ◽

Short Period ◽

Scale Structures ◽

Harvard College Observatory ◽

Period Comet

AbstractUnusual short-period comet 29P/Schwassmann-Wachmann 1 inspired many observers to explain its unpredictable outbursts. In this paper large scale structures and features from the inner part of the coma in time periods around outbursts are studied. CCD images were taken at Whipple Observatory, Mt. Hopkins, in 1989 and at Astronomical Observatory, Modra, from 1995 to 1998. Photographic plates of the comet were taken at Harvard College Observatory, Oak Ridge, from 1974 to 1982. The latter were digitized at first to apply the same techniques of image processing for optimizing the visibility of features in the coma during outbursts. Outbursts and coma structures show various shapes.

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