A study of shock impacts and vibration dose values onboard highspeed marine craft

The shocks and impacts encountered on small high-speed craft exceed the limits set for safe working practice according to current standards. European legislation regarding the exposure to vibration will have far reaching effects on the operators of such craft with respect to the safety of their employees. This paper sets out to highlight the vibration dose values that can be expected during typical transits onboard high-speed craft and attempts to clarify some of the controversy currently surrounding vibration dose measurement in such circumstances. In order to relate vibration dosage to the impacts encountered and to boat motion, an algorithm was developed that identifies the timing and magnitude of impacts

Waveforms for Gravitational Radiation from Cosmic String Loops

We obtain general formulae for the plus- and cross- polarized waveforms of gravitational radiation emitted by a cosmic string loop in transverse, traceless (synchronous, harmonic) gauge. These equations are then specialized to the case of piecewise linear loops, and it is shown that the general waveform for such a loop is a piecewise linear function. We give several simple examples of the waveforms from such loops. We also discuss the relation between the gravitational radiation by a smooth loop and by a piecewise linear approximation to it.Comment: 16 pages, 6 figures, Revte

Heave and pitch motions in shallow water including the effect of forward speed

The problem of small heave and pitch motions of a slender ship in shallow water including the effect of forward speed is analysed using the method of matched asymptotic expansions. Formulae valid to first order in slenderness are given for the added-mass and damping coefficients in terms of the frequency and subcritical Froude number

Keeping a Clean Heart (Chapter 7 of For Today: A Prayer When Life Gets Messy)

Excerpt: When I heard that some of the kids at school received an allowance, money their parents actually gave to them for no particular reason other than to do a few chores around the house, I could hardly believe it. It seemed too good to be true. I never received an allowance, and the idea of having some spending money of any kind was usually out of the question. Once in a while, my mother would give my brothers and me a quarter each to go to the municipal swimming pool if we hoed five rows of corn in the garden, but that was the extent of it. Honestly, we had a loving and supportive family life and there was always good food on the table and clean clothes in the closet, but there wasn\u27t any extra money for extravagances like allowances. We lived paycheck to paycheck, and my parents fretted far more than I knew about running out of money before the end of the month. So, I decided to earn my own spending money. At the age of thirteen, I became an independent businessman- peddling papers for the Saginaw News

Hauerwas and Willimon\u27s Resident aliens: Life in the Christian colony (Book Review)

A review of Hauerwas, S., & Willimon, W.H. (2014). Resident aliens: Life in the Christian colony (25th Anniversary ed.). Nashville, TN: Abingdon Press. 172 pp. $19.99. ISBN 978142678190