Recent content by genxium

Thanks sophie that was a thorough answer. As both you and @BvU pointed out the "reasonably small r = 20um" part is what looks unreasonable here, I'd look more into it :) I used to put some efforts into searching for a near-field intensity formula of the n-slit apparatus, and come across...

According to the intensity formula I = I_0 \cdot \frac{sin^2(n\phi/2)}{sin^2(\phi/2)} (quoted from Feynman Lectures Vol I) Therefore the 2 local minimas adjacent to each global maxima are angularly \Delta \phi_{localmin} = \frac{4\pi}{n} apart. When trying to think of a use case to exploit...

Thanks for the reply! Do you mean that I should investigate the actual magnitude of momentum and momentum uncertainty to evaluate whether 2eV is a reasonable uncertainty in energy? If so I am also checking in this direction, but due to my lack of knowledge in spectroscopy I'm having some...

In the 2001 paper Attosecond Metrology, the authors presented the first attosecond pulse setup and explained the measurements. This paper cites another paper quite often to mention similarities in the setup, but emphasized that they chose different observables: and only the choice made by...

I'm currently working on a pet project which is similar to the OpenAI Lunar Lander v2 (hence the problem is in a 2D context), and seeking help for a sub-problem that's been blocking me for a while. At any instant of time, I'm to find Fe: magnitude of main engine thrust, must be >0 Fs...

Understood. Glad to say that the questions of this thread have all been resolved. I've put together involved netlist files on a git repository for reuse convenience https://github.com/genxium/WienBridgeOscTest.

Of course! And I'm especially curiously about why it doesn't even start with any noise of noticeable amplitude -- sometime before I worked with several "incorrect" Hartley/Colpitts models which at least gave noises at the beginning during transient simulation. Not sure whether there's a...

Didn't mean to delay the reply but your modification to the classical WBO completely took down my guess on the input signal! Unfortunately I haven't got an answer to your question yet but I want to probe more data by myself for a little while. By using Ngspice and the netlist from here...

Apologize for bad wording, by "personal preference" I really meant "no satisfactory technical reason for the choice" :nb) Back to your question. I hope that you could confirm my understandings to the following. By original or classical Wien oscillator, are you referring to this one? And by...

Understood. The Wien oscillator variant used here is not chosen for special purpose, it's by far just personal preference that the paths are "reversed" compared to the classical wbo. However this question and @rude man 's comments make me think of a mistake I've been making. In a simulation...

Is "voltage divider" referring to the path where H(s) = \frac{R_3}{R_3 + R_4} is calculated from?

@rude man I'm not sure whether I understand your argument, to my understanding, my block diagram below is NOT PRESUMED TO BE a valid model of the Wien bridge oscillator below , and this is an essential point where I'm confused about. It was my fault that this wasn't clearly stated. The...

Yes I read the Wikipedia page, and it uses a slightly different (yet classical) WBO structure for analysis. To my understanding the following information is given by that Wikipedia page. The first part of "Analysis" section refers to "loop gain" instead of "closed-loop transfer function" to...

Homework Statement By Wien bridge oscillator (abbreviated as WBO below) I refer to this circuit where the op-amp is assumed to be ideal and the output is the voltage drained from the upper end of R3. What confuses me is that I hardly find a reference which explicitly states that a WBO has a...

It's kind of strange to me that when reading topics like "components of cellphone screen", people often mention an outermost anti-reflecting coating which takes advantage of destructive interference. There're few mentions for using DLC-coating as a cellphone screen outermost coating but...