Hammering with a hand tool appears early in life. Skillful hammering involves accommodating movements to properties of the hammer, orienting the hammer's head to the item to be struck, and maintaining stable posture during forceful action with the arm(s). We aimed to characterize development of these abilities in young children (12, 18, and 24 months old). Children struck at a peg with a hammer...

When designing a hydropower plant with long pressure penstock, special attention must be paid to the conditions in especially during emergency flow shutdown. In this paper, main principles of calculation static rise pipeline rapid shutdown are presented. The results obtained by analytical methods (calculation direct and indirect water hammer) numerical (mathematical modelling Matlab software en...

To cite: Gupta A, Gupta S, Harris S, et al. BMJ Case Rep Published online: [please include Day Month Year] doi:10.1136/bcr-2015213678 DESCRIPTION A 32-year-old man, a mason, presented with right hand pain of 2-week duration, but reported no acute injury. Ulcerative changes and blanching at the tips of right fourth/fifth digits were observed. Significant tenderness to palpation over the right di...

The relationship between final hammer velocity and maximum amplitude of radiated piano sound was investigated. Piano tones with varying hammer velocities were produced by a computer-monitored acoustic piano containing optical sensors and solenoids, and the sounded tones were recorded and digitized for analysis. Maximum amplitudes over the duration of the sounded tones were linearly proportional...

in this paper, after collecting the rock samples from eight mines and one high way slope, the tests for determination of dry density, uniaxial compressive strength, tensile strength (brazilian test), elastic modulus, schmidt hammer rebound number have been done on samples. in addition, in order to calculating the mean size of rock grains, quartz content, hardness and abrasivity, a thin sections...

equipment driven by the printer. When the two codes compare, the hammer is en~r­ gized. The important thing is to get the print hammer thyratron fired at the right time. As long as the sum total of all the operations you do beforehand achieves that, you get the right character. Lt. R. S. Weinberg (Air Materiel Command, United States Air Force): Can you relate something of the service experience...

permits unrestricted nonommercial use, distribution, and reproduction in any medium, provided the original work is properly cited. The moral rights of the named author(s) have been asserted. Explaining aging in evolutionary terms is relatively simple: while a strong selection pressure for an indi-vidual's survival exists until the per-petuation of his progeny is secured, there cannot be selecti...