Recent content by jen0leb

  1. J

    Trying to build a gas collecting chamber above a packed bed

    Hi guys, I'm a graduate student and currently doing some research on a packed bed - I want to collect gas data from the headspace of my samples so i thought of building a gas collecting chamber on top of the vessel, where i can take gas measurements using calorimetric gas tubes. I'm not sure...
  2. J

    Help building a database of organic compounds used in pharmaceuticals

    Hello Guys, So I'm trying to build a database of organic compounds that are of interest to the pharmaceutical industry. Most importantly compounds containing heteroatoms (>= 15% by mass). Where do i start!? any good websites or books, with a useful appendix you can tell me about? I would...
  3. J

    MATLAB Errors while solving an inverted matrix in Matlab

    Hey, i've been trying to find a better fit for a correlation, the numbers I'm dealing with are really small and when i try to solve for the coefficients using the inverse function on the matrices in Matlab i get this error: Warning: Matrix is close to singular or badly scaled. Results may...
  4. J

    How to measure signal from a piezoelectric sensor?

    well I'm trying to measure the concentration of ammonia so when it adsorbs on the surface of the sensors it causes the frequency changes Δf because of Δm applied. i got this idea from the heidelberg PH pill that gives out the measurements by radio transmission, and i was hoping that there's a...
  5. J

    How to measure signal from a piezoelectric sensor?

    Hello, I'm not an electrical engineering student so please bare with me... anyways if let's say you swallow a pill containing a piezoelectric sensor to measure adsorption of a molecule in the stomach how can you detect the changes in frequency? if there is no "physical" electrical connections...
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