Publications (-2014)

[1] Gerolf Ziegenhain. WSPR-Bake zur Untersuchung von Ausbreitungsbedingungen. Funkamateur, 09:956, 2013.
[2] Christian Anders, Eduardo M. Bringa, Fabricio D. Fioretti, Gerolf Ziegenhain, and Herbert M. Urbassek. Crater formation caused by nanoparticle impact: A molecular dynamics study of crater volume and shape. Physical Review B, 85:235440, 2012. [ DOI | http ]
[3] Christian Anders, Eduardo M. Bringa, Gerolf Ziegenhain, Giles A. Graham, J. Freddy Hansen, Nigel Park, Nick E. Teslich, , and Herbert M. Urbassek. Why nanoprojectiles work differently than macroimpactors: The role of plastic flow. PRL, 108:027601, 2012. [ DOI | http ]
[4] Christian Anders, Gerolf Ziegenhain, Carlos J. Ruestes, Eduardo M. Bringa, and Herbert M. Urbassek. Crater formation by nanoparticle impact: Contributions of gas, melt and plastic flow. New J. Phys., 14:083016, 2012.
[5] Christian Anders, Eduardo M Bringa, Gerolf Ziegenhain, and Herbert M Urbassek. Stopping of hypervelocity clusters in solids. New Journal of Physics, 13(11):113019, 2011. [ DOI | http ]
[6] Gerolf Ziegenhain. Atomistische Simulation von Nanoindentation. ISBN: 978-3-8381-1779-9, Südwestdeutscher Verlag für Hochschulschriften, Dudweiler Landstraße 99, D-66123 Saarbrücken, Germany, 2010.
[7] 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 ]
[8] 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 ]
[9] 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.
[10] 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 ]
[11] Christian Anders, Gerolf Ziegenhain, Eduardo Bringa, and Herbert M. Urbassek. Cluster-induced cratering: linking nano- and microscales. In preparation, 2009.
[12] 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 ]
[13] Gerolf Ziegenhain. Atomistische Simulation von Nanoindentation. PhD thesis, TU Kaiserslautern, 06 2009. [ .pdf ]
[14] 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.
[15] 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 ]
[16] 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 ]
[17] Gerolf Ziegenhain and Herbert M. Urbassek. Reversible Plasticity in fcc metals. Philosophical Magazine Letters, 89(11):717-723, 01 2009. [ DOI ]
[18] 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 ]
[19] Gerolf Ziegenhain. Structural properties of binary repulsive systems in two dimensions. Technical report, 2007. [ .pdf ]
[20] T. Kawano. Gnuplot – The definitive Howto. 2006. [ .pdf ]
[21] Gerolf Ziegenhain. Test der Modenkopplungstheorie in zwei Dimensionen. Master’s thesis, Johannes Gutenberg-Universität Mainz, 2006. [ .pdf ]
[22] Mark Vogelsberger, Roland Neb, Oliver Ottinger, Gerolf Ziegenhain, Carsten Handel, Kai Keller, and Christian Bogner. Thermodynamik und Statistische Mechanik. 2005. [ .pdf ]

Talks

[1] Was haben Nanoindentation und Luftraumkontrolle gemeinsam? In Abschlusskolloquium DFG GRK 814. DFG, 26.04 2012.
[2] Christian Anders, Gerolf Ziegenhain, and Herbert M. Urbassek. Stopping of clusters in solids. In COSIRES Krakau, Poland. 9 2010.
[3] 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.
[4] Nanoscale Effects on Indentation. In AG seminar. TU Kaiserslautern, 2 2010.
[5] How to Setup Your Own High-Performance Cluster. In Linux Tag. Berlin., Linux Tag, 6 2010.
[6] High-performance computing zur atomistischen simulation von nanoindentation. In Physics Department. TU Kaiserslautern, 6 2010.
[7] 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.
[8] Gerolf Ziegenhain and Herbert M. Urbassek. Plasticity Under Nanoindentation. 2010.
[9] Gerolf Ziegenhain and Herbert M. Urbassek. Nanoindentation & Elasticity. 2010.
[10] Collisions of Dust Nanoclusters. In International Workshop on Nanostructures in Silica. Saariselkä, Finland, 9 2009.
[11] Simulation of rare events. In Herbert M. Urbassek, editor, Lecture: Computational Materials Science – Advanced Topics. TU Kaiserslautern, 25.6 2009.
[12] Central Collisions of Cu-/SiO_2-Clusters – Status Report. In AG seminar. TU Kaiserslautern, 7 2009.
[13] Introduction to High-performance Computing. In High-performance Computing Workshop. Bandung, Indonesia, 12 2009.
[14] Technological Overview of High-performance Computing. In High-performance Computing Workshop. Bandung, Indonesia, 12 2009.
[15] Strategies in Cluster-design. In High-performance Computing Workshop. Bandung, Indonesia, 12 2009.
[16] High-performance Computing: A review of the past and an outlook to the future. In High-performance Computing Workshop. Bandung, Indonesia, 12 2009.
[17] Plasticity in FCC Metals. In Physics Department, Universitas Padjadjaran. Bandung, Indonesia, 12 2009.
[18] Parallel MD Simulations – Short Ranged Interactions in Homogenous Materials. In Physics Department, Universitas Padjadjaran. Bandung, Indonesia, 12 2009.
[19] Introduction Into Parallel Programming at the Example of the LAMMPS Code. In High-performance Computing Workshop. Bandung, Indonesia, 12 2009.
[20] Atomistische simulation von nanoindentation. In Rigorosum. TU Kaiserslautern, 26.6 2009.
[21] Nanoindentation into Structured Surfaces. In AG seminar. TU Kaiserslautern, 1 2009.
[22] Reversible Plasticity under Nanoindentation of fcc Metals. In MRS Fall Meeting. Boston, MA, USA, 12 2009.
[23] Nanoindentation into Structured Surfaces – Dependency on the Structure Size. In MRS Fall Meeting. Boston, MA, USA, 12 2009.
[24] Herbert M. Urbassek, Steffen Zimmerman, Christian Anders, and Gerolf Ziegenhain. Cluster-induced crater formation. In COSIRES Beijing, China. 9 2008.
[25] Onset of Plasticity Under Nanoindentation: Influence of the interatomic potential. AG seminar; MMM 2008 – Tallahassee, Fl, USA; DFG GK Meeting, 10 2008. [ http ]
[26] Onset of Plasticity Under Nanoindentation – Influence of the interatomic potential. In GK meeting. TU Kaiserslautern, 3 2008.
[27] Anisotropic Effects in Nanoindentation – Crystalline Structure and Potentials. In Department Werkstoffwissenschaften Erlangen. University Erlangen, 3 2008.
[28] On the Stackingfault Energy – Pair Potentials and Material Science. In AG seminar. TU Kaiserslautern, 2 2008. [ http ]
[29] Atomistic Simulations of Nanoindentation. In Fraunhofer ITWM High Performance Computing. TU Kaiserslautern, 1 2008.
[30] From Fluid Dynamics to QM – Applications of the Lattice Boltzmann Method. In Computational Physics. TU Kaiserslautern, 7 2008. [ http ]
[31] Critical Slowing Down – Solid State Theory Approach for Determining a Glass Transition. In Computational Physics. TU Kaiserslautern, 6 2008. [ http ]
[32] Understanding and Extending the LAMMPS Code. In AG seminar. TU Kaiserslautern, 5 2008.
[33] Introduction to the Beowulf Cluster. In AG seminar. TU Kaiserslautern, 2 2008.
[34] Status: Nanoindentation of Simple Crystals – Relaxed Surfaces, Indentation Data, Plasticity. In AG seminar. TU Kaiserslautern, 7 2007.
[35] Parallel MD Simulations – Short Ranged Interactions in Homogenous Materials. In AG seminar. TU Kaiserslautern, 2007. [ http ]
[36] Extending the Timescales in MD Simulations – Introduction. In AG seminar. TU Kaiserslautern, 5 2007.
[37] Introduction to Nanoindentation – Elasticity Theory. TU Kaiserslautern, 2007.
[38] Simulations of Nanoindentation – Concepts and Results for Preliminary Model. In GK seminar. TU Kaiserslautern, 5 2007.
[39] Nanoindentation and -scratching. In GK Proceedings. TU Kaiserslautern, 2007.
[40] Plasticity under Nanoindentation. In AG seminar. TU Kaiserslautern, 10 2007.
[41] Nanoindentation of Simple Crystals – Elastic and Plastic Properties. In DFG GK Meeting Potzberg. TU Kaiserslautern, 10 2007.
[42] Atomistische Modellierung. In Tag der Physik. TU Kaiserslautern, 12 2007. [ http ]
[43] Vom singenden Draht zum DVB-C – Ist digitale Kommunikation effizienter? In Tag der Physik. TU Kaiserslautern, 12 2007. [ http ]
[44] Rissausbreitung. In Tag der Physik. TU Kaiserslautern, 12 2007.
[45] Lecture – Structural Properties and Glass Transition of 2d Colloids. In AG seminar. TU Kaiserslautern, 2006.
[46] Gerolf Ziegenhain and Rolf Schilling. Mode coupling theory in two dimensions. In Materialwissenschaftliches Forschungszentrum der Johannes Gutenberg-Universität Mainz. 5 2006.
[47] Gerolf Ziegenhain and Herbert M. Urbassek. Nanoindentation and Nanoscratching – Atomistic Aspects. 2006.

Wikipedia Contributions

[1] Wikipedia. Dipole antenna. 2012. [ http ]
[2] Wikipedia. Frequency-shift keying. 2012. [ http ]
[3] Wikipedia. Software-defined radio. 2012. [ http ]
[4] Wikipedia. Balun. 2012. [ http ]
[5] Wikipedia. Near vertical incidence skywave. 2012. [ http ]
[6] Wikipedia. Random wire antenna. 2012. [ http ]
[7] Wikipedia. Voacap. 2012. [ http ]
[8] Wikipedia. Sloper antenna. 2012. [ http ]
[9] Wikipedia. Wspr (amateur radio software). 2011. [ http ]
[10] Wikipedia. Chirp transmitter. 2011. [ http ]
[11] Wikipedia. Qrp operation. 2011. [ http ]
[12] Wikipedia. Antenna tuner. 2011. [ http ]
[13] Wikipedia. Plasticity (physics). 2010. [ http ]

Lightify Lampen mit Hue verwenden

Für den Preis einer Hue Lampe sind zwei Lightify Lampen zu haben, doch das Hue System ist verbreiteter… Wie lässt sich eine Lightify Lampe in ein Hue System einbinden?

Die Lightify Lampen (Osram) verwenden, wie auch die Hue Lampen (Philips), das Zigbee Protokoll. Die Implementierungen sind nicht standardisiert, weshalb beispielsweise die Kopplung über Seriennummern oder das vollständige Ausschalten der Lampen dank unterschiedlich realisierter Parameter nicht direkt funktioniert. Die Hersteller sind bemüht die Kompatibilität mit Firmware-Updates sicherzustellen.

So funktioniert das Einbinden der Lightify Lampen:

  1. Falls die Lampen zuvor mit der Hue Bridge gekoppelt waren, dann:
    Reset der Lampen: 5x hintereinander die Lampe jeweils (a) 5 Sekunden an, dann (b) 5 Sekunden aus
  2. Verbinden der Lampen zur Lightify Bridge über die Lightify App
    (Die Bridge wird nur für das Firmware Update benötigt)
  3. Firmware Update der Lampen auf neuste Version durchführen
  4. Reset der Lampen: 5x hintereinander die Lampe jeweils (a) 5 Sekunden an, dann (b) 5 Sekunden aus
  5. Lampen einschalten
  6. In Hue App nach neuen Lampen suchen
    => Die Lampen tauchen auf und lassen sich vollständig ausschalten!

QRP Appliance?

A QRP Appliance comes to live. It contains:

  1. KD1JV Tribander
    1. with speaker mod
    2. power supply mod
  2. Elecraft T1 Tuner
  3. American Morse Paddle
  4. Power Poles

07.03.15 - 1.jpg


Verified All-Band TRX for the Yaesu FT 817 ND

The information available on the web may be misleading: the jumper enumeration is ambiguous and little information on the extended range exists.

I have summarized the information on how to enable all-band TRX on the FT 817 ND in the picture below.

Bild.png


Elecraft T1 ATU in FT 817: Done.

As described in http://www.ngunn.net/cyberworld/hamradio/t1/ I have successfully integrated a T1 tuner into my FT 817. My tuner was sensitive to noise on the 9V rail – using the 12V rail from the data port and some blocking capacitors I finally got the tuner working.evernote-camera-roll-20150207-145037


Hack for Archiving Google Drive

Problem: Archiving of Google Drive documents does not work with the google drive app. Why? Google Drive App stores only links to the cloud (i.e. .gdoc, .gsheet).
Solution: Write a script and use a cron job 🙂


#!/bin/bash
google_drive_dir="/home/my_user_name"
which gdrive >/dev/null || echo "Missing gdrive. Get it here: https://github.com/prasmussen/gdrive"
_archive_filetype ()
{
from=$1
to=$2
find "$google_drive_dir" -name "*.$from" -print0 | while read -d $'\0' file
do
id=$(sed 's/.*"doc_id": "//;s/".*//' "$file")
bd=$(dirname "$file")
cd "$bd"
gdrive download --id $id --format "$to" --force
done
}

_archive_filetype gdoc docx
_archive_filetype gslides pdf
_archive_filetype gsheet xlsx


Connect Morse Key to Iphone

How to connect morse key to an iPhone? Using the buttons on the standard headphones does not work, as the apple interface does not provide low-level access to low-level events like button-down. The idea (R1, R2) will be (1) put a signal to one stereo channel (2) receive the same signal on the input channel (small resistor will simulate mic) (3) detect tone level changes for input channel -> real time-morse (4) put side-tone & co to remaining stereo channel.

Pasted Graphic

  • 1(Tip) – Key (Ground)
  • 2 – Ear (Contact)
  • 3 – Ear (Ground)
  • 4(Ground) – R2(46,6k) – Key 1
  • 4(Ground) – R3(22k) – Key 2
  • 4(Ground) – R1(1k) – 3

I got a prototype running with irmc-ios (R4) and the same physical interface also works with iMorsix (R3).
IMG_0188

(R1) Hijacking Power from […] Audio Interface
(R2) Sources: hijack-main
(R3) App: iMorsix
(R4) App: irmc-ios