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Posts posted by Klaynos

  1. No... not a single term. But there are professional bodies for which levels of membership may have certain criteria associated. 

    For example I am a member of the institute of physics. To get the level of member I needed a supporter and to provide evidence of working at a given level as a professional phycisist for a given amount of time. 

    Many of these bodies provide chartership as well as membership grades, e.g. chartered phycisist or chartered engineer. 

  2. Arduino does make home labs much more accessible. 

    You need to find some way to rule out the vacuum pump and associated electrics from being the cause of the magnetic fields. Which is far far more likely than what you're proposing. 

    But I have to commend you for actually doing an experiment and improving it based on feedback. Experimental physics isn't easy, I would anticipate a fair few iterations of the experiment before you've rulled out most of the obvious interferers. 

  3. 1 hour ago, Sensei said:

    Interesting and easy project for Arduino. IR diode with serial class used to get data on the computer.

    #include <Serial.h>
    static const int pinIR = A0; // let it be at analog pin...
    void setup() {
       pinMode( pinIR , INPUT );
       Serial.begin( 9600 );
    void loop() {
      int state = analogRead( pinIR );
      Serial.println( state );

    Then use Tools > Serial Plotter to see what has been received on graph. Press the all TV remote controller buttons one by one.

    If the above code will work, the next step could be LCD screen shield with buttons, with SD card shield. Press button to start recoding to memory, press button again to stop recording. Program buttons to pick up one of recorded already sequences, and replay them using IR emitting diode.


    That's pretty much exactly what I was thinking. Arduino is great for things like this. With esp8266 and ittt you can make an Alexa controlled remote (other home automation services exist).

  4. 10 minutes ago, Strange said:

    Thanks for looking that up. (I was too lazy at the time!) They seem to have a limited number of fixed functions. I was thinking more of the "universal" TV remotes which can be set to use one of a large number of different command sets. They could be hardwired but might be easier to make using a simple programmable controller.

    Ah yeah. I expect you're right. 

    You can even get (or at least build) ones that you point other remote controls at and can remember what they receive. 

  5. 1 hour ago, Strange said:


    But there the light from the LED is also modulated to encode the different commands. I would imagine most of them use a simple microcontroller.

    I don't know, remote controls were around before the advent of small cheap microprocessors. If the non microprocrssor solution works, is reliable and cheap I suspect it's still quite common. Probably something clever with cheap timing chips. 

    I'm not sure if the question was about the modulation of the actual photon generation?

  6. Maths, all the maths at highschool level. 

    Photonics rather than particle physics but of my contemporary PhD students I would suggest that 1 in 5 is probably a fair value for the number of people who stay in academia. I don't work in l anything close to my PhD subject but I do collaborate with some particle phycisists. 

    I wouldn't get too caught up in the difference between a theoretical phycisists and an experimentalist. It's rare that the line is very strong in my experience. Although I almost always refer to myself as an experimental phycisist, at least two of my papers are pretty much theoretical model development with some experiments to test it. 

  7. 7 minutes ago, MassMan said:

    Abraham cried when he is going to sacrifice his son. God only test Abraham's faith on Him. Abraham's son was not sacrifice afterall.

    Modern changes to the story. He was really happy for the chance.

  8. 5 minutes ago, MassMan said:

    They think it's evil but their hearts and minds are polluted by their ideologies. Like what happened to the Nazi Germans. They know it's evil but because of their ideologies their hearts were clouded. They know it's evil but they have to do it. We are humans who knows what is right or wrong but if our hearts and minds are polluted by evil desires, we will not know right from wrong. But objective morality still exist even we don't already know right from wrong. God is justified to condemn us.

    That reads like wishful thinking and is subjective. 

    Child sacrifice happened almost universally for probably thousands of years. There's even some who argue that Abraham not sacrificing his son but using an animal instead is a more modern change from him actually sacrificing his child. 

    God? That's not evidence, just more subjective wishful thinking. 

  9. 7 minutes ago, MassMan said:

    It is truly evil and worst if you kill it without any reason. Objective moral values do exist. There is a term evil because there is really evil. Some things are really wrong.

    I don't think they do. Humans have conducted child sacrifice in the past. They didn't think it evil. 

  10. If it was a falcon and not a hawk then it's a different type of bird. Maybe he was trying to give you a positive negative answer. 

    Or... It it's just a combination of a very very big sample size and confirmation bias. 

  11. 2 hours ago, Alfred001 said:

    But that would give me only the stuff they've published in that database, no? If they've also published stuff in journals not included in that database I wouldn't get those.

    That will always be the case. You will not catch fish outside of where you cast your net. You could try searching all of the larger databases, Google scholar, web of science, Google books etc... But there is still the chance of missing things. 

    The easiest way is probably by asking the researcher. Although I've been known to forget my own publications. Especially the less formal ones (e.g. conference proceedings). 

  12. Where in Somerset is this? (I didn't realise you were that close)

    I'm wondering if the vertical velocity from the Weir might have caused a very gradual undercut. Which possibly together with the recent very dry warm spell causing some movement above the low water line has caused the drop. The fault in the wall following some weak point, possibly a repair or showing how it was built in sections?


  13. I used hc-05 as an example. Yeah torch tail switches are normally not too big. What host are you using? 

    You could look at 433MHz transmitter receiver pairs. That plus an attiny85 surface mount on a bespoke PCB might just get down to the size required. 

    I imagine the few lights that do this do it by having some more space and something on the mcpcb. 

    What led are you using in your torch? The Samsung LH351D looks pretty interesting at the moment. 

  14. 2 hours ago, Brett Nortj said:

    Well, would it be okay to talk about 'kissing techniques,' or, would that be against he forum rules?

    Against the rules, I'm not sure depends what you say. Weird, definitely. 

    Really your whole thread reads a bit off to me. A bit like a youngish guy who is upset that he isn't getting what he wants.

  15. You'd need a Bluetooth module and probably a microprocessor to interpret the info and then a transistor as the switch. 

    Outside pairing a hc-05 uses about 8mA you could run that at the voltage of the cr2032 along with say an Arduino pro micro 3.3V at around 5mA with no modifications. Cr2032 are typically in the region 250mAh, if we call it 260 mAh for simplicity, 260/13 is 20 hours. You can get the Arduino side down quite a bit but not sure how much better more expensive Bluetooth 4 devices will get you. 

  16. 1 hour ago, MathGeek said:

    History has shown the value of skepticism when someone asserts that a given area of science is completed and wrapped neatly with a bow.

    To my knowledge, most of the remaining areas of interest in electromagnetism are in the area of interactions with matter.  I did a lot of work early in my career in the area of interactions of very strong fields with matter - multiphoton effects of light with atoms and very strong static electric and magnetic field effects with atoms.

    More recently, I've contributed to a few projects relating to whether certain species are able to detect electric and or magnetic fields - so called electroreception and magnetoreception.  I suppose one could argue that these are more biology than physics, but as a physicist who understand the fundamentals of E&M and carefully considers potential detection mechanisms I was a valuable team member.

    My PhD was in the interaction of electromagnetic radiation with matter. 

    It's still a pretty big area of research. 

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