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Ask Electrical Engineering Engineering

Grounding in CAN / RS485 Busses

I’m interested in how to properly realize Grounding in a CAN / RS 485 bus setup. From my understanding, when non-isolated transceivers are used, in addition to the differential signal lines, a third ground wire should be used in order to eliminate potential differences between the nodes, that is, in order to avoid excess common-mode […]

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Android User Help

Screen on when charging on powered off phone

The issue My phone’s screen is always on when I charge it while it is turned off. It displays this image: And the screen cannot be turned off. I believe it is not charging either, but I can boot it normally. It charges normally when on. Specification Image installed: lineage-17.1-20201012-UNOFFICIAL-treble_a64_bvS Build number: treble_a64_bvS-userdebug 10 QQ3A.200805.001 […]

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Ask Engineering Software Engineering

Why Don’t We Add `Attributes` To Use Case Diagrams?

I’m a undergraduate, and studying ‘Software Design And Analysis’ for my current semester. As part of the course, I was handed over a case study from which I had to make out the visual form of the resulting Use Case Diagram, with the necessary Use Cases and `Actors. The case study is about Purchasing Flight […]

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Apple User Help

How to benchmark a NAS from a Mac (Neither fio nor bonnie++ work)

I want to test the performance of a NAS before and after I change its setup. I have found two tools for this, fio and bonnie++. The problem is that they are both broken on Mac right now (and have been for some time it seems). fio doesn’t compile (Due to changes in XCode 8?) […]

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Mastering Development

Clojurescript first steps doubts and problems

I just started with clojurescript and I have many doubts, what I want to do is use clojurescript only to solve basic problems, for now nothing to do with web. If I eliminate the web development part, would there be any difference between coding in Clojure and ClojureScript? or is it exactly the same? Also […]

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User Help Web Pro

Google does not index pages and defines wrong canonical

Contex I have a domain, andrasnovoszath.com which previously I redirected to another one bcdataanalytics.com. About a month ago I stopped the redirect and started to write posts on it as on a separate site. Issue Google does not index the pages, save a few early ones, and only one later one. Even more, in the […]

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Mastering Development

How to prevent scrolling below a modal DIV and force 100% size

I made a modal web image viewer in javascript. When you click on a thumbnail in a gallery, it opens a black div (100% window size) with the image, blocking what’s behind it. The div has some transient controls to go to the next/previous image, close, etc. It works perfectly in desktops, but it has […]

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Mastering Development

Pickle module that breaks the code from the book “Conceptual Programming with Python”

I’m taking the example from the book "Conceptual Programming with Python". Some introduction to the problem that the code is aimed at solving: Example: Creating a Knowledge Base As a second example for OOP, we are going to implement a simple guessing game! But this game will be able to learn from experience, that is, […]

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Ask Chemistry

What is the duration of time needed if heating activated carbon at 100 degrees celsius to recharge?

I have 5 pounds of loose activated bamboo charcoal that I am using as an odor absorber. When I need to recharge it, I would like to heat it to 100 degrees celsius. How long does it need to remain at this temperature to recharge, that is, de-adsorb anything on its surface?

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Ask Chemistry

Can we relate approximate Hartree-Fock orbitals to true solutions in the basis-set limit?

Assume that we’ve "solved" the RHF Hartree-Fock equations in some finite basis, that is, we have arrived at a self-consistent set of coefficients $c_{\mu{}i}$ such that each spatial molecular orbital is expanded as $\chi_i = \sum_{\mu=1}^K c_{\mu{}i}\varphi_i$. By construction, this set of orbitals is orthonormal, and forms a collection of eigenfunctions for the Fock operators […]