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  1. .Scott

    Medical Science, Medical Ethics, COVID-19

    The open letter to the WHO has now been published. A link to the PDF is at this URL: Open Letter to WHO
  2. .Scott

    Medical Science, Medical Ethics, COVID-19

    There is a COVID-19 issue that has been brewing for at least a couple of months: Is the primary COVID-19 communication vector aerosols? But only in the past couple of weeks has this issue started to come to a boil - as in this article: WHO Balks at Pointing to Aerosols The difference here is...
  3. .Scott

    Are programming interviews effective these days?

    I have been on both the interviewer and interviewee side of those "puzzle" questions. As an interviewer, the first thing I do is compare the resume to what we need to fill the position. Then, assuming there is a reasonable overlap, I will focus on the specific position-relevant experiences...
  4. .Scott

    Does the order in which you run two 'for' loops matter?

    Another potential factor is optimization performed by the compiler. If you process the elements in the order they occur in memory, the compiler is more likely to recognize that you are treating the array as one-dimensional. The result could be the saving of some of the array indexing...
  5. .Scott

    Insights Recursion in Programming and When to Use or Not to Use It

    Here are a couple of more examples of recursion - the DFT and iDFT. C Code for FFT. I have coded the Discrete FT before. But never used explicit recursion to do it.
  6. .Scott

    Insights Recursion in Programming and When to Use or Not to Use It

    Out of the night, when the full moon is bright, Comes some code that is known as Zorro. This bold engineer codes a 'Z' with his gear, a 'Z' that stands for Zorro! ... I'll stick with ZigZag ... and the next time I will makes the collating plots look less like sword play.
  7. .Scott

    Insights Recursion in Programming and When to Use or Not to Use It

    Why did I call this a "ZigZag" sort? ... in case anyone is interested. After reading that original AACM article, I studied the algorithm and realized that it made for a good in-place sort for the reasons I described above. But before I adopted it, I wanted to prove to myself that it would...
  8. .Scott

    Insights Recursion in Programming and When to Use or Not to Use It

    If you're looking for a worse case scenario for "no stack support", I submit the HP2100 series (circa 1967). A call to a routine at location 300 would result in the return address being stored at 300 and execution beginning at 302. And I do remember writing code to support reentrancy on that...
  9. .Scott

    Chemistry Finding the mass of an aldehyde

    Let's say that X is the mass of the aldehyde. X+mass(H2) = what function of mass(alcohol)?
  10. .Scott

    Chemistry Finding the mass of an aldehyde

    4.45% of the mass of the aldehyde is the mass of what you are adding to the aldehyde. All that's left is the Algebra.
  11. .Scott

    Is this study worth making lifestyle changes over?

    Perhaps ... but ... Their conclusion was: But the nature of the study is only able to indicate a correlation. So the study presents evidence that there is a correlation between men who use a cell phone or stay on line a lot and those with decreased sperm volume, etc. The immediate question in...
  12. .Scott

    I Confidence interval on Standard deviation

    Here is a tool: CI of SD Tools That tools reports: 2.82 to 3.20 The site below provides a more specific example in one of its tables: https://www.graphpad.com/guides/prism/7/statistics/stat_confidence_interval_of_a_stand.htm For the 95% Confidence Interval of the SD and n=500, it reports...
  13. .Scott

    I Confidence interval on Standard deviation

    You can calculate your confidence interval with this tool: Confidence Interval The degrees of freedom is you sample size minus one (499), but that is not required by this tool.
  14. .Scott

    Job Skills Getting Discouraged in my Engineering Job, Pondering a Career Change

    First, this "pressure" isn't a "today" thing. I've been a SW Engineer for 50 years and it was there day 1. Also, estimating a job is not one of the skills you walk in with. More than most things, it requires experience. The temptation is to estimate how long it will take you to do everything...
  15. .Scott

    Arcing in electrical relay contacts due to different types of loads

    Even if the load is not inductive at all, the mechanical process of separating the conductors can draw an arc. In fact, when I look at a physical contact that is breaking a resistive load on the oscilloscope - and spread the timeline out to nanoseconds, I can see many makes and breaks - as the...
  16. .Scott

    What does it mean that a rigid body is in equilibrium?

    " A rigid body is in equilibrium when it is not undergoing a change in rotational or translational motion." That doesn't mean it isn't moving. Only that the motion is not changing.
  17. .Scott

    Arcing in electrical relay contacts due to different types of loads

    You may be interested in this article: Intrinsically Safe (explosive environment)
  18. .Scott

    Arcing in electrical relay contacts due to different types of loads

    You can definitely get a lot more arcing with an inductive load. As the circuit is interrupted, the voltage across the contacts rises. In the worse case, you have a current source with enough reserve voltage to continue the circuit even when the relay is fully open. The same problem exists with...
  19. .Scott

    C/++/# Recursive-Array

    It is related to the "Golden Hammer". But the first use I heard of it was in the early 1980's. The US Senate was looking at the burgeoning use of CT Scan machines - and the problems that were arising when more of these machines were being purchased by hospitals within a market area then the...
  20. .Scott

    I Is the Following How Most Students Think of Einstein's View Of QM

    The uncertainty is not introduced by the measurement process. It is inherent in what is being measured. The predictions that QM makes are most commonly probability distributions - not a specific result but a distribution of possible results. So when the experiment is repeated hundreds of...
  21. .Scott

    I Is the Following How Most Students Think of Einstein's View Of QM

    I would not be surprised if additional constraints were discovered on how basic Physics works - beyond those described by current QM. I view the apparent "random" result from QM experiments as uncovering information - rather than manufacturing it from nothing. Although my initial reaction to...
  22. .Scott

    Possible to network in one's field while learning new science?

    I actually went to college twice. The first time was simply for the education, the second time was for the certificate. This was the first time. And, although Professor Rojak offered several courses that might have interested me (information theory, the laser lab, and several EE courses), none...
  23. .Scott

    Possible to network in one's field while learning new science?

    When I was at college, I worked with one of the professors (Prof. Rojak) in his laser lab. My purpose was simply to discover holography and other laser-related matters. But I was also well known to him as a very able programmer. A year or so later, someone visited Prof Rojak asking him for...
  24. .Scott

    Possible to network in one's field while learning new science?

    Networking is nothing more than meeting people (virtually or actually) within your field (or any field) and perhaps eventually asking them to assist you with whatever your goal may be. Learning "new science" is presumably what all scientists and student of science do. They can certainly be...
  25. .Scott

    SpaceX Crew Dragon Demo-2: Launch success

    Closer to the equator - a little boost with Earth rotation. And a safe place for East-bound boosters to fall.
  26. .Scott

    SpaceX Crew Dragon Demo-2: Launch success

    They're giving it until T-17:00 - but they don't expect it to clear. Launch abort just started.
  27. .Scott

    SpaceX Crew Dragon Demo-2: Launch success

    At T-20:00 Scrubbed for weather: Low clouds and lightning energy dissipation. Hmmm - but they're hedging.
  28. .Scott

    SpaceX Crew Dragon Demo-2: Launch success

    It's more specific than that. The launch site will cross the ISS orbital plane moments after the launch time. Live ISS Orbit Also, this verifies that this confirms this as the first human US flight with an instantaneous launch window:
  29. .Scott

    SpaceX Crew Dragon Demo-2: Launch success

    The crew was just told that a weather front over Orlando - and heading their way - appears to be eroding. So the weather is looking better.
  30. .Scott

    SpaceX Crew Dragon Demo-2: Launch success

    I believe it's to arrive in orbit already synced with the ISS orbit - thus shortening the rendevous time. That is the most common reason. I will see if I can check that.
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