Shortcuts: [Publications] [Talks] [Movies] [Software] [Ham Radio] [Cluster]

As there are already enough websites out there, this page only provides content and no personal data. Some random noise can be found in my google profile. If you want to see some more information about me, you may browse to my xing profile. Due to various reasons I don't provide all stuff for direct download. If you want to have some of the files described in this website or some further information, please drop me a mail: zNiOeSgePn@rhArk.uMni-kl.de (remove all capital letters). My GPG Key is 57030C35 (details).

Currently I am working as a postdoctoral assistant at the Technical University Kaiserslautern in the group of Prof. Herbert M. Urbassek. My research interests are:

Adhesive contacts
Plastic deformation (in FCC metals) (introduction)
Nanoindentation (introduction)
dust-collision of silica
crater formation
long time scale events

Teaching

Biophysik VI - WS2010/2011

Movies

In this section some movies of my atomistic simulations are shown.

Generation of Plasticity under Indentation in (100) Copper

The plastic deformation under loading with a spherical indenter can easily be investigated using atomistic simulations.

Plasticity under Nanoindenter in (111) Copper Simulation result from a MD simulation on (111) Copper modelled with the EAM potential of Mishin. All particles in ideal lattice positions are omitted and the color code refers to the von Mises stress field.
View on the whole crystal
The formation of a screw dislocation can be seen on the top surface. Obviously it is not easy to observe the plastic deformation.
Only the lattice defects
Stacking faults are colored in red, partial dislocations and the surfaces are colored in gray. The nucleation of plasticity is homogenous. An amorphous blob of defective particles is nucleated in the region of the maximal stress. Later a stacking fault is nucleated and cross glide sets in.
von Mises Stress
The same scene using a volumeview to show the von Mises stress from different angles.

Xmas Simulations

Using computer simulations it is possible - believe it or not - to set up useless configurations. Some examples are given below :)

2009: influence of shockwaves on xmas trees
2008: influence of a sack with too many gifts on xmas trees
2007: on the interaction of a sack of gifts and a xmas tree
2006: on the behaviour of xmastrees under the influence of hot candles

Publications

[1]	Gerolf Ziegenhain. Atomistische Simulation von Nanoindentation. ISBN: 978-3-8381-1779-9, Südwestdeutscher Verlag für Hochschulschriften, Dudweiler Landstraße 99, D-66123 Saarbrücken, Germany, 2010.
[2]	Gerolf Ziegenhain, Alexander Hartmaier, and Herbert M. Urbassek. Influence of Crystal Anisotropy on the Onset of Plasticity in Nanoindentation - a Molecular Dynamics Study. J. Appl. Phys., 107:061807, 2010. [ DOI \| Preprint ]
[3]	Gerolf Ziegenhain and Herbert M. Urbassek. Nano-structured surfaces yield earlier: a molecular-dynamics study of nanoindentation into adatom islands. Physical Review B, 81:155456, 03 2010. [ DOI ]
[4]	Gerolf Ziegenhain and Herbert M. Urbassek. Nano-structured surfaces yield earlier: a molecular-dynamics study of nanoindentation into adatom islands. Virtual Journal of Nanoscale Science & Technology, 21(19), 03 2010.
[5]	Christian Anders, Herbert M. Urbassek, Gerolf Ziegenhain, S. Delle-Negra, M. Fallavier, A. Novikov, V. Domaratsky, V. Obnorsky, S. Yarmiychuk, and K. Wien. Desorption of gold from gold nanodispersed targets by 200keV Au_5 polyatomic ions in the elastic stopping mode: Experiments and MD. Nuclear Inst. and Methods in Physics Research, B, 267, 2009. [ DOI ]
[6]	Christian Anders, Gerolf Ziegenhain, Eduardo Bringa, and Herbert M. Urbassek. Cluster-induced cratering: linking nano- and microscales. In preparation, 2009.
[7]	Christian Anders, Gerolf Ziegenhain, Steffen Zimmermann, and Herbert M. Urbassek. Cluster-induced crater formation. Nuclear Instruments and Methods in Physics Research Section B, 267(18):3122-3125, 2009. [ DOI \| Preprint ]
[8]	Gerolf Ziegenhain. Atomistische Simulation von Nanoindentation. PhD thesis, TU Kaiserslautern, 06 2009. [ .pdf ]
[9]	Gerolf Ziegenhain, Christian Anders, and Herbert M. Urbassek. Cluster-impact-induced crater formation: Transition from melt-flow to gas-flow cratering. In preparation, 1 2009.
[10]	Gerolf Ziegenhain, Alexander Hartmaier, and Herbert M. Urbassek. Pair vs many-body potentials: influence on elastic and plastic behavior in nanoindentation. Journal of the Mechanics and Physics of Solids, 57:1514 - 1526, 2009. [ DOI \| Preprint ]
[11]	Gerolf Ziegenhain and Herbert M. Urbassek. Effect of material stiffness on hardness: a computational study based on model potentials. Philosophical Magazine, 89(26):2225-2238, 2009. [ DOI \| Preprint ]
[12]	Gerolf Ziegenhain and Herbert M. Urbassek. Reversible Plasticity in fcc metals. Philosophical Magazine Letters, 89(11):717-723, 01 2009. [ DOI ]
[13]	Onset of Plasticity Under Nanoindentation Influence of the Interatomic Potential. In The Fourth International Conference on Multiscale Materials Modeling, Tallahassee, FL, USA, October 27-31 2008. [ http ]
[14]	T. Kawano. Gnuplot - The definitive Howto. 2006. [ .pdf ]
[15]	Gerolf Ziegenhain. Test der Modenkopplungstheorie in zwei Dimensionen. Master's thesis, Johannes Gutenberg-Universität Mainz, 2006. [ .pdf ]
[16]	Mark Vogelsberger, Roland Neb, Oliver Ottinger, Gerolf Ziegenhain, Carsten Handel, Kai Keller, and Christian Bogner. Thermodynamik und Statistische Mechanik. 2005. [ .pdf ]

Talks / Posters

[1]	Christian Anders, Gerolf Ziegenhain, and Herbert M. Urbassek. Stopping of clusters in solids. In COSIRES Krakau, Poland. 9 2010.
[2]	Mini-symposium: High performance computing and its applications on scientific research. In The Third International Conference on Mathematics and Natural Sciences. Institut Teknologi Bandung, Bandung, Indonesia, 11 2010.
[3]	Nanoscale Effects on Indentation. In AG seminar. TU Kaiserslautern, 2 2010.
[4]	How to Setup Your Own High-Performance Cluster. In Linux Tag. Berlin., Linux Tag, 6 2010.
[5]	High-performance computing zur atomistischen simulation von nanoindentation. In Physics Department. TU Kaiserslautern, 6 2010.
[6]	High performance-computing for the atomistic simulation of plasticity in fcc metals. In The Third International Conference on Mathematics and Natural Sciences. Institut Teknologi Bandung, Bandung, Indonesia, 11 2010.
[7]	Collisions of Dust Nanoclusters. In International Workshop on Nanostructures in Silica. Saariselkä, Finland, 9 2009.
[8]	Simulation of rare events. In Herbert M. Urbassek, editor, Lecture: Computational Materials Science - Advanced Topics. TU Kaiserslautern, 25.6 2009.
[9]	Central Collisions of Cu-/SiO_2-Clusters - Status Report. In AG seminar. TU Kaiserslautern, 7 2009.
[10]	Introduction to High-performance Computing. In High-performance Computing Workshop. Bandung, Indonesia, 12 2009.
[11]	Technological Overview of High-performance Computing. In High-performance Computing Workshop. Bandung, Indonesia, 12 2009.
[12]	Strategies in Cluster-design. In High-performance Computing Workshop. Bandung, Indonesia, 12 2009.
[13]	High-performance Computing: A review of the past and an outlook to the future. In High-performance Computing Workshop. Bandung, Indonesia, 12 2009.
[14]	Plasticity in FCC Metals. In Physics Department, Universitas Padjadjaran. Bandung, Indonesia, 12 2009.
[15]	Parallel MD Simulations - Short Ranged Interactions in Homogenous Materials. In Physics Department, Universitas Padjadjaran. Bandung, Indonesia, 12 2009.
[16]	Introduction Into Parallel Programming at the Example of the LAMMPS Code. In High-performance Computing Workshop. Bandung, Indonesia, 12 2009.
[17]	Atomistische simulation von nanoindentation. In Rigorosum. TU Kaiserslautern, 26.6 2009.
[18]	Nanoindentation into Structured Surfaces. In AG seminar. TU Kaiserslautern, 1 2009.
[19]	Reversible Plasticity under Nanoindentation of fcc Metals. In MRS Fall Meeting. Boston, MA, USA, 12 2009.
[20]	Nanoindentation into Structured Surfaces - Dependency on the Structure Size. In MRS Fall Meeting. Boston, MA, USA, 12 2009.
[21]	Herbert M. Urbassek, Steffen Zimmerman, Christian Anders, and Gerolf Ziegenhain. Cluster-induced crater formation. In COSIRES Beijing, China. 9 2008.
[22]	Onset of Plasticity Under Nanoindentation: Influence of the interatomic potential. AG seminar; MMM 2008 - Tallahassee, Fl, USA; DFG GK Meeting, 10 2008. [ http ]
[23]	Onset of Plasticity Under Nanoindentation - Influence of the interatomic potential. In GK meeting. TU Kaiserslautern, 3 2008.
[24]	Anisotropic Effects in Nanoindentation - Crystalline Structure and Potentials. In Department Werkstoffwissenschaften Erlangen. University Erlangen, 3 2008.
[25]	On the Stackingfault Energy - Pair Potentials and Material Science. In AG seminar. TU Kaiserslautern, 2 2008. [ http ]
[26]	Atomistic Simulations of Nanoindentation. In Fraunhofer ITWM High Performance Computing. TU Kaiserslautern, 1 2008.
[27]	From Fluid Dynamics to QM - Applications of the Lattice Boltzmann Method. In Computational Physics. TU Kaiserslautern, 7 2008. [ http ]
[28]	Critical Slowing Down - Solid State Theory Approach for Determining a Glass Transition. In Computational Physics. TU Kaiserslautern, 6 2008. [ http ]
[29]	Understanding and Extending the LAMMPS Code. In AG seminar. TU Kaiserslautern, 5 2008.
[30]	Introduction to the Beowulf Cluster. In AG seminar. TU Kaiserslautern, 2 2008.
[31]	Status: Nanoindentation of Simple Crystals - Relaxed Surfaces, Indentation Data, Plasticity. In AG seminar. TU Kaiserslautern, 7 2007.
[32]	Parallel MD Simulations - Short Ranged Interactions in Homogenous Materials. In AG seminar. TU Kaiserslautern, 2007. [ http ]
[33]	Extending the Timescales in MD Simulations - Introduction. In AG seminar. TU Kaiserslautern, 5 2007.
[34]	Introduction to Nanoindentation - Elasticity Theory. TU Kaiserslautern, 2007.
[35]	Simulations of Nanoindentation - Concepts and Results for Preliminary Model. In GK seminar. TU Kaiserslautern, 5 2007.
[36]	Nanoindentation and -scratching. In GK Proceedings. TU Kaiserslautern, 2007.
[37]	Plasticity under Nanoindentation. In AG seminar. TU Kaiserslautern, 10 2007.
[38]	Nanoindentation of Simple Crystals - Elastic and Plastic Properties. In DFG GK Meeting Potzberg. TU Kaiserslautern, 10 2007.
[39]	Atomistische Modellierung. In Tag der Physik. TU Kaiserslautern, 12 2007. [ http ]
[40]	Vom singenden Draht zum DVB-C - Ist digitale Kommunikation effizienter? In Tag der Physik. TU Kaiserslautern, 12 2007. [ http ]
[41]	Rissausbreitung. In Tag der Physik. TU Kaiserslautern, 12 2007.
[42]	Lecture - Structural Properties and Glass Transition of 2d Colloids. In AG seminar. TU Kaiserslautern, 2006.
[43]	Gerolf Ziegenhain and Rolf Schilling. Mode coupling theory in two dimensions. In Materialwissenschaftliches Forschungszentrum der Johannes Gutenberg-Universität Mainz. 5 2006.
[44]	Gerolf Ziegenhain and Herbert M. Urbassek. Nanoindentation and Nanoscratching - Atomistic Aspects. 2006.

Linux / Software

In this section some snipplets of my software are published. Consider all of this software as not even alpha, as I'm only interested in hacking it for my own purpose. If somebody is interested in taking over any of the projects, feel free to do so :) All the software snipplets I wrote are provided under the GPLv3, of course.

Nokia N770/N800/N810 - Maemo

Some experiments I have done with the Nokia Internet Tablets.

wecker // Wecker!
A simplistic alarm clock using mplayer. It was written, because the alarm clock supplied with OS200? is turning off the sound too fast for me. The software is written in python.
@garage.maemo.org or git://repo.or.cz/wecker.git

Physics Software

As this is scientific research software it is under heavy development and probably unuseable for others. Drop me a mail if you are interested in this code.

Contributions to LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator The LAMMPS is a massively parallel molecular dynamic simulation tool.
- Damped long-ranged coulombic potentials
- HDF file format extensions
- Angular Distribution based local structure analysis. Included in the main branch.
- lammps-vim // Vim syntax highlighting for LAMMPS scripts Included in the main branch.
  git://repo.or.cz/lammps-vim.git
- Local temperature/pressure detector On demand. Drop me a mail.
- Strain rate detector On demand. Drop me a mail.
ClusterDetector // Cluster Detector Detection of particle clusters. Written in C and including a Python interface.
git://repo.or.cz/ClusterDetector.git
lm-algorithm // Levenberg-Marquardt-Algorithm PY/HNC & OZ Equation Solver in Two Dimensions. The algorithm is described in this report.
@Sourceforge or git://repo.or.cz/lm.git
OpenGL / Povray MD Visualizer with gamepad support

Ham Radio

cw RSS Feeds The latest W1AW Code Practice Files and other cw training mp3s are provided in a podcast form here: rss.ziegenhain.com. (currently offline)
WebSDR Some of my sdr kits (Funkamateur, Softrock) are available on saturn.physik.uni-kl.de. (currently offline) In the next weeks this server will relocate to a place with a good antenna.
hamlib-spacenavigator // Tune your rig using a 3d mouse This script allows to use the space navigator 3d mouse to tune your rig using the hamlib interface.
git://gitorious.org/hamlib-spacenavigator/mainline.git
Mini-Morse // Koch / N0HFF Morse Trainer Why use a complicated program to obtain/improve your cw skills? Morse code is simple - and so is this program. This small python script will generate mp3 files (also containing speech) for training the morse code.
@Sourceforge or MP3 Koch Method @last.fm or MP3 Koch Method @archive.org or git://repo.or.cz/Mini-Morse.git
HamExam // Amateurfunk Prüfungstrainer A tool for preparation of the ham radio license examination. This tool uses the questions provided here and the hints provided here. Screenshot
@garage.maemo.org or @Sourceforge or git://repo.or.cz/HamExam.git

Cluster

During my PhD thesis I have built a high-performance cluster at the Technical University Kaiserslautern. Below you can find snipplets of the my software tools. Due to this work I was invited as a speaker to the Workshop on High Performance Computing: from design to application.

corvix GNU/Linux A linux distribution for scientific environments. It has an own website: corvix.ziegenhain.com. The status of the distribution is currently out of order. Currently I don't find the time to maintain it any more. git://repo.or.cz/corvix.git
Queue management tools Tools for managing the torque/maui queue system. On demand. Drop me a mail.

Other Software

Sonata
Patched for changing the volume of the mpd server from commandline. This is in particular useful, if you want to bind the mpd controls to keyboard shortcuts. Using a simple commandline client for this is not so straight forward, if you want to control several mpd servers; then you would have to keep track to which server sonata is currently connected. Furthermore the last.fm support has been bugfixed.
git://gitorious.org/sonata-vol/sonata-vol.git
rbackup // remote incremental backups using rsync Using rsync/ssh this script will create incremental backups of your ~. It can easily be adjusted via crontab entries.
git://repo.or.cz/rbackup.git
fax-sipgate & sms-sipgate // fax & sms from commandline using the sipgate api

git://repo.or.cz/fax-sipgate.git

git://repo.or.cz/sms-sipgate.git

outvim // VIM outliner tool

Screenshot

git://repo.or.cz/outvim.git

Egatrop An attempt to bring the advantages of gentoo to debian. The ebuild / portage concept has been rewritten from scratch and adapted to debian to provide an easy way to keep track of custom compiled software. On demand. Drop me a mail.
vo2html // Vim Outliner to HTML conversion tool The vim editor has some nice extensions for outlining. In order to convert your stuff to html pages I wrote a small awk script. There are two versions Create webpages from vim outliner's .otl files using css stylesheets. (up to version v0.2 in my repository)
git://repo.or.cz/vo2html.git
gnutodo // GNU Todo This script was an attempt to learn how to use scripting (AJAX) for webpages. It features a rich todo list and can be used from both command line and browser. The script is written in zsh.
@Sourceforge or git://gitorious.org/gnutodo/mainline.git

Last modified: 23.08.2010