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Lecture about depression

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One of the most interesting chapters in the book deals with the correlation between creativity and mental illness, bringing scientific rigor to such classic anecdotal examples as those evidenced in Van Gogh’s letters or Sylvia Plath’s journals or Leo Tolstoy’s diary of depression or Virginia Woolf’s suicide note. Having long opposed the toxic “tortured genius” myth of creativity,
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  Strain Measurement ãA body subjected to external forces is in a condition of both stress and strain.ãThe effects of stress, i.e. change of shape of the body, involvechange in the fundamental quantity, length, which can be measured.ãThus provided there is a known relationship between stress and strain, the stresses occurring in a body can be computed if sufficient strain information is available.ãTypes of strain gauges used in engineering are listed as under: Gauge TypeEffect of Strain Bonded wire, bonded foil, Change of electrical resistance.semiconductorLecture 10  Continued… PhotoelasticFringe displacement.ExtensometersThese include a variety of methods for measuring extension, i.e. mechanical, optical, pneumatic, inductance, capacitance, and acoustic responses.  Requirements for Accurate Strain Measurement ãIdeally gauges used for measuring strain should conform to the following requirements:(1) The gauge should be small in size and easy to attach to the specimen or component, its profile should be as low as possible so that it will respond in unison with the changes in the surface to which it is fixed.(2)The gauge should be highly sensitive in the direction of the measured strain but of low sensitivity in the transverse plane. The strain-resistance characteristics should be linear.(3)Calibration should be easy and once done should remain stable with time, dynamic loading, changes of temperature, pressure, and humidity.  Continued… (4)Speed of response should be high so that time lag is negligible.(5) Gauges should be inexpensive, reliable, and readily available. There should be a variety of types and sizes to suit a wide range of applications.(6)Immersion in liquids should not modify performance.(7)The evaluation of complex strain patterns should be obtainable from as small a number of strain measurements as possible.ãBonded resistance strain gauges fulfill many of these requirements.
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