Recent content by Chas Tennis

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    How Many People Can Perform Quantum Mechanical Calculations?

    You could post what you as an individual can do if you like, please give an example problem or two. Those examples would be very interesting. If you mean 1) solving QM course or test problems that were presented to you VS 2) your selecting what was needed and setting up QM calculations, note that.
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    How Many People Can Perform Quantum Mechanical Calculations?

    Let's say that people that set up and worked QM problems would be counted. Let's say that taking a QM course with provided problems would not be counted.
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    How Many People Can Perform Quantum Mechanical Calculations?

    In the 1980s, a speaker at a conference said that 'There are 2000 engineers in the US that can design large scale integrated circuits.' I have always liked that crisp estimate. I have been reading about the early history of quantum mechanics and wondering about the number of scientists and...
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    How Many People Can Perform Quantum Mechanical Calculations?

    TL;DR Summary: Quantum mechanical calculations are complex and the number of people capable of performing them is limited. In this thread, rough estimates are requested for the number of people that perform quantum mechanical calculations. Please estimate - somehow - the number of people that...
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    A Two Slit Interference Experiment Variations

    Publication from the OP reference. Young’s double-slit experiment with single photons and quantum eraser Wolfgang Rueckner and Joseph Peidle Harvard University, Cambridge, Massachusetts 02138(Received 25 January 2012; accepted 19 August 2013) Abstract An apparatus for a double-slit...
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    A Two Slit Interference Experiment Variations

    Nature Scientific Reports - Google Search title and the full publication is available. Interference experiment with asymmetric double slit by using1.2-MV field emission transmission electron microscope. Ken Harada1,3, Tetsuya Akashi2,4, Kodai Niitsu 1, Keiko Shimada1, Yoshimasa A...
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    B What is causing destructive interference in double slit experiment?

    You are asking a question that Quantum Mechanics never explains. What is going on? I liked the way this situation was described in the Introduction of Jean-Pierre Vigier and the Stochastic Interpretation of Quantum Mechanics 1st Edition by Jean-Pierre Vigier (Author), Stanley Jeffers...
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    I Do atoms recoil when emitting a photon?

    The text Optics, 3rd Ed by E. Hecht (1998) has the answer to the OP question. Page 51, Figure 3.16. Yes, atoms recoil. I don't see a reference. The experiment shown is of 1) Source of atoms. 2) Through 1st aperture to form directed atoms. 3) Excitation is added. 4) Through 2nd aperture forming...
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    A Two Slit Interference Experiment Variations

    Examples that have references to special two slit experiments : https://sciencedemonstrations.fas.harvard.edu/presentations/single-photon-interference https://en.wikipedia.org/wiki/Double-slit_experiment If you have an opinion on what you think the experiments tend to support and what they do...
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    Imaging Emitted Covid 19 Samples with an Electron Microscope

    Still have not seen electron microscope images of Covid 19 related to droplets or aerosols of Covid 19 emitted by infected people. But the aerosol transmission route has been getting more attention. But here are images giving some information about the lung & nasal sources that emits Covid 19...
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    Imaging Emitted Covid 19 Samples with an Electron Microscope

    Do you mean the "low vacuum or wet conditions in variable or environmental SEM"? I was not aware of that type of SEM. "Specimens are observed in high vacuum in conventional SEM, or in low vacuum or wet conditions in variable pressure or environmental SEM, and at a wide range of cryogenic or...
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    Imaging Emitted Covid 19 Samples with an Electron Microscope

    An EM image size was listed as from 6 mm across to 12 um across varied by zooming. Using low magnification, a scientist would find images of virus and other material (that was originally in a water droplet) and zoom into examine it. Let's assume an application as described in posts #19 and...
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    Imaging Emitted Covid 19 Samples with an Electron Microscope

    I never mentioned that the EM examination would provide any information on how infectious Covid 19 from patients was. With an additional sampling process, other measurements could be made for how long the emitted virus remains infectious. After the virus is collected at a site with infected...
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    Imaging Emitted Covid 19 Samples with an Electron Microscope

    There are many Covid 19 problems and this seems a feasible solution to try. Here is a quote from the publication in post #12 about breathing and 1 micron particles. This is an example of a very important problem that seems workable. "Their experimental work involved artificially generated...
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    Imaging Emitted Covid 19 Samples with an Electron Microscope

    The electron microscopy seems to have the only potential to put the virus together with its surrounding particle (or what's left of it after collection). An EM expert would know about image processing issues. I lived near Johns Hopkins University and used to attend some of the lectures at the...
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