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S-cloud - simulation or reality?

Service and consulting for your R&D applying computer simulations for closer looks and precise decisions, contact us now:

xirrus GmbH
Buchzelgstrasse 36
8053 Zürich

e-Mail: info@xirrus.ch
Tel. +41 44 741 01 74

xirrus simulation service presented in 3 min

For references read bottomline

xirrus simulation Flarm

background information: out-takes of the video explained

Warning devices communication protocol

Analysis of efficacy and enhancing the radio communication protocol:

Glider planes are in danger to crash with each other. With their narrow outline, the standard white color scheme and the bright backgrounds the gliders are difficult to recognize. This is why there is little time left for pilots to react, especially if they are heading directly towards each other (here demonstrated with a plane speed of 120 km/h – glider planes are capable to fly much faster even!)

An early warning sequence eliminates the danger and allows for a secure emergency turn. Flarm is the leading producer of such warning devices and has brought a real-world solution on the market, exchanging GPS-supported data by radio. The capability of radio communication is limited by its bandwith, but where is this limit? Testing the limit for real would be dangerous, of demanding logistics and only little informative.

Thanks to computer simulations provided by xirrus hundert thousands of scenarios can be played through, even highly exaggerated volumes of traffic. Every situation can be analysed, also rare effects are detected (so-called long-tail effects, the ones that normally appear ahead of accidents). Here the technical limit of the device is shown. For better viewability all the other glider planes are marked by a big red arrow: Beyond all usual traffic volumes!

Flarm is just one example for the possibilities of xirrus simulation. Similar situated problems are found everywhere, where saturation phenomena and its implied capability limits are a topic. Flarm faces the difficulty to use the available "talk time" efficiently, since the autonomous functioning devices cannot exchange about this (respectively this would again request and use up valuable "talk time"). The hereby occuring constellations and correlations are difficult to imagine – but relatively easy to simulate.

» read more about saturation phenomena and congestion

Aus Kondens-Zirren wachsen andere Wolken

Molecular interactions (molecular dynamics)

Understanding interactions and optimization of surface coatings:

Surfaces play an important role in nanotechnology, since they determine how e.g. a droplet behaves on them: does it roll off or does it deliquesce? In the picture shown is a noble metal (golden) or an oxidized surface (grey/red) with a nanoscale water droplet. While on the noble metal a hemispherical droplet is formed, it diffluences on the oxidized surface. Depending on the application, one or the other behaviour is desirable.

Who wants to control the behaviour on top of surfaces has to control the surface properties initially. Materials can be coated with a brush-layer (brush-like oriented molecules), to function as repellant to water. The influence of minimal differences in the chemical composition, the density and the fibre length are of great influence to the efficacy. The simulation enables a service to decide early on the right choice.

Below one micrometer, just where biology and nanotechnology work, molecular properties and interactions are decisive for what's occuring. In the movie the interaction between biotin (small grey/red/blue/yellow/white molecule) and streptavidin, a protein (yellow and magenta ribbons and white strings) is shown. In the simulation, the binding partners can be investigated in different aspects, e.g. adhesion and adsorption, friction and wear, or the consequence of modifications.

Molecular dynamics is a simulation methods with provenance at the University of Groningen (NL) and the ETH Zurich (CH) and has been commercialized in the product GROMOS by BIOMOS b.v.. xirrus simulation provides simulations on the basis of molecular dynamics as a service to customers, who can avoid complex modeling, complicated usage of software and analysis high in traps. Continuously, models and processes are developed further. As an alternative, we can derive material properties through calculations of measurements from simulations.

» read more about molecular dynamics simulations one the nano-scale

cloud with a question mark

Special problems

  • Are the emergency exits of my hall adequate to human crowds in danger?
  • Is it possible to derive a secure warning for small investors before the next financial crisis?
  • How does a vermin spread with the highest probability? How can it be antagonized efficiently?
  • How should entrance and exits be arranged to maximize my volume of sales?
  • In my chain of logistics, where does the bottleneck occur that can be widened at lowest costs?
  • ...
Many real and complex problems consist of, metaphorically spoken, a big crowd of "actors", which inbetween themselves and towards their environment stand in "interaction":
  • radios, that communicate with each other
  • atoms and molecules, with its physical-chemical interactions
  • car drivers, with another car in front on roads
  • plants, which pollinate each other and spread
  • nodes of networks, that communicate
  • humans, in crowds, on search for an emergency exit
  • humans, in their relationship to each other
  • "actors" in "interaction" in "environment"
  • ... in ... in ...
The big number of "actors" (here shown as spheres) is typical and their mostly individual "interactions" (realised here, spheres are attracting each other), lead to a momentum, which is difficult to estimate. Depending on the number of spheres a single layer or sometimes a second layer occurs. Strange enough the spheres in the lower layer prefer a hexagonal structure, in the upper layer a squared pattern. It comes to an unclear problem. Exactly, a complex problem.

Your demanding the answer to a question like in the examples above or in the video. Our service consists of finding the answer by applying our whole know-how about computer models, software development, simulations and statistics and presenting possible solutions well-founded and in detail. Be it in one of the named topics – or be it something completely new.

Simulation and analysis help to recognise the problem as a whole, intensely enlighten it from different perspectives and find decisive indications. Our results contain additional recommendations, therefore comprise a consulting function too. We take your problem and take-off the programming, simulation, statistics and analysis. Confidently leave it to us, and look forward to proposals for solution!

Do not hesitate, to work together with us from xirrus GmbH. Our quality awareness, the honesty and objectivity, efficiency in realisation and small error rate are a rewarding investment in your development. You can count on our confidentiality. Additionaly we maintain an excellent network with other service providers, all professionals in their specific branch. Here your complex problem is in safe hands!

» xirrus simulation takes effect here

References to image material used in the video: glider planes: © Stefan Leutenegger; cloud animation: © 2009 EUMETSAT; humand crowd: (cc) James Cridland; storage: (cc) Erik Söderström; network of software: (cc) Anders Sandberg; biochemical pathways: © John D. Furber; strategic meeting: (cc) Bernard Pollack; emergency eject button: (cc) Ian Hughes; emergency eject of jet: U. S. Air Force / elly.org / cdb; thinking model E-Z grow: © Adam Sicinski; tray racking, attractors: free out of wikimedia; rest: © 2010, xirrus GmbH; Thanks to all Open Source developpers, especially Povray, Gromacs, Jmol, JChemPaint