Isidor Isaac Rabi by Ciro Santilli 37 Updated +Created
Online model by Wikipedia Bot 0
The term "online model" can have different meanings depending on the context in which it is used. Here are a few common interpretations of the term in various fields: 1. **Online Learning Model**: In education, an online model refers to a system where courses or educational programs are delivered over the internet. This model allows students to access learning materials, participate in discussions, and complete assignments from anywhere, often at their own pace.
Ciro's Edict #7 / --format-source by Ciro Santilli 37 Updated +Created
Added ourbigbook --format-source automatic code formatting. I implemented it for the following reasons:
  • I want to do certain automatic modifications to source code on web, e.g.:
    • allow users to select the parent article of a new article on the web UI, but that is currently doable only with \Include macros
    • allow users to edit the source only for a specific header
  • later on, much later, this will allow WYSIWYG export to plaintext
This also ended up having one unexpected benefit: whenever a new feature is added that deprecates an old feature, by converting the large corpus from github.com/cirosantilli/cirosantilli.github.io to the new feature I can test the new preferred feature very well.
For example, converting \x[blue cat] en masse to the new insane syntax <blue cat> found several bugs with the new insane syntax.
This seemed somewhat easy at first, so I started it as a way of procrastinating more urgent Web features (web scares me, you know), but it ended being insanely hard to implement, because there are many edge cases. Also, most bugs are not acceptable, as they would corrupt your precious source code and potentially output.
But well, it is done!
Loop (topology) by Ciro Santilli 37 Updated +Created
Ciro's Edict #8 by Ciro Santilli 37 Updated +Created
This month included several exciting extremelly user visible web developments.
I can't help to feel how the speed of developments reflects my relative mastery of the stack, I'm very happy about how it went.
Standard Telephones and Cables (STC) is a company that was historically involved in the manufacturing of telecommunications equipment and related technologies. Founded in the early 20th century, STC became known for its production of telecommunication systems, cables, and devices, contributing to the development of telephone networks and infrastructure. The company played a significant role in the telecom sector, particularly in the UK, supplying equipment for both domestic and international markets.
Ciro's Edict #9 / OurBigBook.com by Ciro Santilli 37 Updated +Created
Ciro's Edict #9 / Next steps by Ciro Santilli 37 Updated +Created
Spontaneous parametric down-conversion by Ciro Santilli 37 Updated +Created
Phenomena that produces photons in pairs as it passes through a certain type of crystal.
You can then detect one of the photons, and when you do you know that the other one is there as well and ready to be used. two photon interference experiment comes to mind, which is the basis of photonic quantum computer, where you need two photons to be produced at the exact same time to produce quantum entanglement.
Video 1.
One Photon In, TWO Photons Out by JQInews (2010)
Source.
Mentions that this phenomena is useful to determine the efficiency of a single photon detector, as you have the second photon of the pair as a control.
Also briefly describes how the input energy and momentum must balance out the output energy and momentum of the two photons coming out (determined by the output frequency and angle).
Shows the crystal close up of the crystal branded "Cleveland Crystals Inc.". Mentions that only one in a billion photon gets scattered.
Then shows their actual optical table setup, with two tunnels of adjustable angle to get photons with different properties.
Video 2.
How do you produce a single photon? by Physics World (2015)
Source.
Very short whiteboard video by Peter Mosley from the University of Bath, but it's worth it for newbs. Basically describes spontaneous parametric down-conversion.
One interesting thing he mentions is that you could get single photons by making your sunglasses thicker and thicker to reduce how many photons pass, but one big downside problem is that then you don't know when the photon is going to come through, that becomes essentially random, and then you can't use this technique if you need two photons at the same time, which is often the case, see also: two photon interference experiment.
Stanley Gill by Wikipedia Bot 0
Stanley Gill notably refers to an East Anglian novelist and author known for his works that often explore themes of rural life and the human condition. However, there may also be other references depending on the context, such as a person in business or another field.
Optimal projection equations are mathematical formulations used in various fields, particularly in optimization and data analysis, to find the best representation of data in a reduced-dimensional space. These equations help to project high-dimensional data onto a lower-dimensional space while preserving essential characteristics of the data. ### Key Concepts 1. **Projection**: In a mathematical and geometrical sense, projection refers to mapping points from a higher-dimensional space to a lower-dimensional space. This is often done through linear transformations.
Physics from Symmetry by Jakob Schwichtenberg (2015) by Ciro Santilli 37 Updated +Created
This is a good book. It is rather short, very direct, which is a good thing. At some points it is slightly too direct, but to a large extent it gets it right.
The main goal of the book is to basically to build the Standard Model Lagrangian from only initial symmetry considerations, notably the Poincaré group + internal symmetries.
The book doesn't really show how to extract numbers from that Lagrangian, but perhaps that can be pardoned, do one thing and do it well.
The TenDRA Distribution Format (TDF) is a standardized method for representing, distributing, and manipulating software source code. It is closely associated with the TenDRA compiler, which is designed for the implementation of programming languages, primarily C and C++. TenDRA emphasizes strong typing, modularity, and the ability to support multiple programming languages.
Karl Guthe Jansky by Ciro Santilli 37 Updated +Created
SQL application by Ciro Santilli 37 Updated +Created
Abdigani Diriye by Wikipedia Bot 0
Abdigani Diriye is a notable figure in the field of computer science, particularly known for his work in artificial intelligence and human-computer interaction. He has contributed to research in areas such as machine learning, data science, and the development of technologies that improve user experience. Diriye is also recognized for his work related to the intersection of technology and social impact, focusing on how digital innovations can benefit marginalized communities.
Luboš Motl by Ciro Santilli 37 Updated +Created

Pinned article: ourbigbook/introduction-to-the-ourbigbook-project

Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
We have two killer features:
  1. topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculus
    Articles of different users are sorted by upvote within each article page. This feature is a bit like:
    • a Wikipedia where each user can have their own version of each article
    • a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
    This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
    Figure 1.
    Screenshot of the "Derivative" topic page
    . View it live at: ourbigbook.com/go/topic/derivative
  2. local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:
    This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
    Figure 5. . You can also edit articles on the Web editor without installing anything locally.
    Video 3.
    Edit locally and publish demo
    . Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension.
  3. https://raw.githubusercontent.com/ourbigbook/ourbigbook-media/master/feature/x/hilbert-space-arrow.png
  4. Infinitely deep tables of contents:
    Figure 6.
    Dynamic article tree with infinitely deep table of contents
    .
    Descendant pages can also show up as toplevel e.g.: ourbigbook.com/cirosantilli/chordate-subclade
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact