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  admin 4:56 pm on July 20, 2010 Permalink | Reply
  Tags: Aircraft, Linear, Model, Nonlinear, Should, Simulation   

  In The Simulation For Aircraft ,should Model Be Linear Or Nonlinear? 

  i am working on a project ,i am making simulation for the 747 ,but i don’t know if the model should be linear or nonlinear.i mean can i use the A B C D matrices or i should use nonlinear model then i have to linearize it?thanks
  

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  Since a 747 is not a linear machine, (really nearly nothing is linear), I reckon you should use a nonlinear model.
  The main reason because engineers used to like linear models is because they are simple to work with (simpler math). Nowadays, with computers doing the hard math work it does not make much sense to use linear model for everything.
  In the ancient days when all engineering work was done with paper and pencil, “simple math” linear models was the only way to go. Today with powerful computers and software readily available, there are not many reasons for not using a more accurate nonlinear model.

   

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  admin 1:44 pm on July 5, 2010 Permalink | Reply
  Tags: Serious, Should, Start, Symptoms (2), Tinnitus (13), Worry   

  How Serious Can The Symptoms Of Tinnitus Get, And When Should I Start To Worry? 

  I’ve suffered from tinnitus for more than ten years now, but in the last few years symptoms have really started to take a turn for the worse and now the condition has become quite painful physically. I experience constant earaches, headaches, soreness/tingling, and occasional vertigo (though no insomnia). Anyone know of any alternative remedies (e.g. acupuncture, herbal medicines, etc.,) that may help?

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  Tinnitus can be due to a lot of things: certain medications like aspirin, diuretics etc; hearing loss; meniere’s disease or even a tumor. Sometimes, the cause is unknown, too. Usually, you would be referred to an otolaryngologist and they will check your ears and order a hearing test. Depending on the results, they will either prescribe meds, hearing aids or question for further work ups to be done (MRI/CT scan – if they suspect a tumor). So please see your doctor first before going for alternative therapy.
  After reading your additional details: maybe it would help to get a new hearing test and see if it has changed … your diagnosis may change too since it seems like its been years since you have last been seen by your doctor … if there is nothing worse than a hearing loss (or even none) then hearing aids may help – just to dampen the sound of the tinnitus – you may also try turning on the radio/TV at a low level at night – again, to mask the tinnitus (usually tinnitus is worse at night). Hope this helps!