studiot

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studiot last won the day on February 15

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1623 Glorious Leader

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About studiot

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    SuperNerd

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  • Location
    Somerset, England
  • Favorite Area of Science
    applications of physical sciences
  • Occupation
    Semi Retired Technical Consultant

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  1. studiot

    Finding percentage of reagent in a mixture

    You are right this is the key to it. So what do you think the reaction is or reactions are? What do you know about the solubility of the four possible salts involved?
  2. studiot

    Pedia Press

    Does anyone have any experience of Pedia Press ? I was looking at something this morning on Wikipedia and I was offered the opportunity to order hard copy (or perhaps pdf), which I thought was very interesting. Unfortunately their system locked up on me half way through so I never got full details. In particular I never found out if they would post to the UK. I can provide the general link if required, but don't want this to be considered advertising.
  3. But your question was not an answer to the original one (which was effectively can we have a repository for such BS ) even though it was a reasonable one. So it is strictly speaking off topic. But do you really want to be that strict? I think the mods do a fine job between pernickettyness and laxity and encourage members to obey the rules rather than just slap them down at every opportunity. Thus they offer a way forward (provide evidence) rather than just saying. "Rule broken" and taking some sort of drastic moderator action. Perhaps with your interest in the Life Sciences you could propose a way to get members to post in the appropriate section in the first place?
  4. If I had a nickel for every time I've read swansont say "This is not mainstream. Moved to speculations. Please read the rules of speculations and provide evidence for your proposal." or similar, I'd be a billionaire. That typing wing must be worn out by now. I'd say that is ample room for allowing the rules to be followed before the final curtain is dropped.
  5. studiot

    Strange light bulb behavior

    Even if it's wrong, that's a better thought than any I had about the question +1 One comment, though. The only indication that power was 'still on' was that an electric clock was still working. What electric clock and was anything else working? I have several electric clocks (cooker, electric curtains, heat pump controller etc) that all have internal batteries so will remain working during power cuts.
  6. Is there a claim that there is one and only one correct answer ?
  7. Yes you could but bonding is better because the mechanical vibration frequency of the crystal is tranducted into an electrical frequency by the bonded electrodes vibrating with the surfaces they are bonded to. Pressing/clamping the electrodes on means you are opposing the mechaical vibration of the crystal. This introduces a varying capacitance into the circuit, but you need other circuit components to sustain oscillation and create an electrical oscillator.
  8. What would be good would be if you could discontinue the ad hominem content and stick to mathematics.
  9. studiot

    near light-speed travel

    You have added more than I was thinking of. Thanks. +1
  10. studiot

    Identify this instrument...Deflectometer?

    My guess would be it is part of some pre-laser technology collimator or autocollimator system. These have parts in common with theodolites, but are not theodolites. https://www.bmisurplus.com/products/category/metrology
  11. Whether the stuff comes from a herbalist or an ethylene cracking plant the stuff is still chemical. I do believe I offered the only non chemical answer so far with PBM. Which is interesting (to me) because I am currently undergoing a course of PBM treatment and the next session is tomorrow.
  12. A function is more than an equation. Functions have three parts, one of which is sometimes called the rule - I do not know of a posh mathematical term for it. Equations can be rules, but not all equations. for instance the equation 2 = 1 + 1 is not part of a function. Equally not all functions have rules that are defined by an equation. Sometimes this is actually impossible, as when the rule is defined by a process. Since you are American, I will refer you to that well known american guru of these mateers - Tom Apostol. Most writers concentrate on the definition of the continuous. Few include a definition of the discontinuous. Tom, bless him, includes several. Specifically for my example he refers to a jump discontinuity. This is mainstream not the guff on stackexchange you linked to which was not even about my example but the original question asked about a very discontinuous function. My example has only one discontinuity and I have already outlined the proof (which incidentally I see looking it up is the way Tom presents it). If you work it out you will find that (in Tom's notation) f(x) - A = 0 and therefore is always less than epsilon for any epsilon greater than zero.
  13. studiot

    Ionic Charges

    It would be useful to both yourself and us if you posted the exact question since I doubt very much if any teacher has asked about "The ionic charges of an atom" It is a very very basic fact that atoms are electrically neutral. Adding or taking away electrons makes them into negatively or positively charge ions.
  14. Photobiomodulation could well be one, but you need to expand on your discussion to tell us what purpose the chemical drugs/medication is being used for.
  15. I am out tonight, so will not reply again today. As regards the Dutch, I have not the luxury of being bilingual like my sister-in-law who teaches Maths in Leiden and her husband. If it is too difficult, I could ask them to translate if you sent me a document by PM.