The following Matlab files are given at: psd_syn_revD.zip psd_syn.m is the main Matlab script. The remaining scripts in the zip file are supporting functions. It synthesizes an acceleration time history to satisfy a power spectral density function. It also calculates the corresponding velocity and displacement… Read more
One of the first references to Zion in the Bible is: Nevertheless David took the strong hold of Zion: the same is the city of David. (2 Samuel 5:7). This scripture refers to a military battle in which David captured a fortress on Mount Zion… Read more
Here are some edited notes given to me by a colleague who is writing software programs to import Nastran data into Matlab. DMAP DMAP (Direct Matrix Abstraction Programming) is the language running under the hood in the various nastran solution sequences. All the math that happens… Read more
I will be presenting a 3-hour tutorial session at the 83rd Shock and Vibration Symposium in New Orleans, on November 4, 2012. My session is called “Shock Response Spectra & Time History Synthesis.” Students will receive basic instruction in calculating shock response spectra for time… Read more
The Lord doesn’t care at all if we spend our days working in marble halls or stable stalls. He knows where we are, no matter how humble our circumstances. He will use—in His own way and for His holy purposes—those who incline their hearts to… Read more
Pyrotechnic devices such as linear shaped charge and frangible joints are used for stage and fairing separation in launch vehicles. These devices generate high-frequency mechanical shock energy. Avionics components mounted in the vehicle must be designed and tested to withstand this shock energy. Thus, ground… Read more
The Apostle Paul taught: [7] For we walk by faith, not by sight. 2 Corinthians 5 * * * We walk by faith, and not by sight; no gracious words we hear from him who spoke as none e’er spoke; but we believe him near.… Read more
The Ten Commandments were given by Jehovah to the Children of Israel, as recorded in the Old Testament, Exodus 20. * * * Exodus 20 [1] And God spake all these words, saying, [2] I am the LORD thy God, which have brought thee out… Read more
“There is nothing that we are enduring that Jesus does not understand, and He waits for us to go to our Heavenly Father in prayer. If we will be obedient and if we are diligent, our prayers will be answered, our problems will diminish, our… Read more
The English Book of Mormon uses the term “Christian” four times. See Alma 46:13, 15, 16 & Alma 48:10. (There is also a reference to Christian Whitmer, a nineteenth century witness to the Book of Mormon plates.) This usage is well and good for English… Read more