The Svedberg (symbol: S) is a unit of time used in the field of biochemistry and molecular biology to measure the sedimentation rate of particles in a centrifuge. It is named after the Swedish chemist Theodor Svedberg, who won the Nobel Prize in Chemistry in 1926 for his work on the ultracentrifuge and the behavior of colloids. One Svedberg unit is defined as \(10^{-13}\) seconds.
A borescope is a visual inspection tool used for examining the inside of objects, especially in areas that are difficult to access. It consists of a long, slender tube with a camera or lens at one end and an eyepiece or video display at the other, allowing users to view images of internal structures without disassembling or damaging the object being inspected.
Marcos Dajczer is an Argentine mathematician known for his work in the fields of differential geometry and geometric analysis. His research often involves topics like minimal surfaces, geometric variational problems, and the study of curvature in different geometric contexts.
Testia is a company that specializes in providing testing and inspection services, particularly in the fields of aviation, aerospace, and other high-tech industries. It offers a range of services including non-destructive testing (NDT), technical expertise, and training related to quality assurance and compliance with industry standards. Testia’s services help ensure the safety and reliability of aircraft and components, making it an essential player in maintaining high-quality standards in the aerospace sector.
Videoscope typically refers to a type of medical instrument that integrates video technology with an endoscope, allowing for the visualization of internal structures in the body. This device is commonly used in various medical procedures to diagnose and treat conditions within organs such as the gastrointestinal tract, respiratory system, and urinary tract, among others. A videoscope consists of a long, flexible tube equipped with a miniature camera and light source.
Weld tests for friction welding are assessments conducted to evaluate the quality, strength, and integrity of welds produced through the friction welding process. Friction welding is a solid-state welding technique that uses mechanical friction to generate heat at the interface of the materials being joined. This heat causes the materials to become malleable and allows them to fuse together under pressure.
Variable Structure Control (VSC) is a control strategy used in systems where the dynamics can change over time or in response to varying conditions. It is particularly beneficial for systems that exhibit significant uncertainties, nonlinearities, or require robust performance. VSC focuses on adjusting the control law or structure based on the current state of the system, which helps maintain desired performance across a range of operating conditions.
A Variable Structure System (VSS) is a type of dynamic control system that is designed to adapt its control strategy based on the current state of the system or the external conditions. The key characteristic of VSS is that it changes its structure or control law during operation, allowing it to maintain desired performance even in the presence of uncertainties, nonlinearities, or varying system parameters.
Eivind Hiis Hauge is a name that may refer to an individual, but there is no widely known or prominent information about a person by that name in publicly available sources. It is possible that he is a private individual or a professional in a specific field, but without additional context, it's difficult to provide more details.
Bernt Michael Holmboe (1860-1929) was a notable figure in the field of Norwegian exploration and academia. He is recognized for his contributions to the study of the Arctic regions and natural history, particularly in relation to Norway's geographic and scientific endeavors during the early 20th century. Holmboe was involved in a range of expeditions, and his work helped facilitate a greater understanding of the Arctic environment, contributing to the scientific knowledge of that time.
Carl Anton Bjerknes was a Norwegian meteorologist and physicist known for his significant contributions to the field of meteorology and the understanding of weather phenomena. He is often credited with founding modern meteorology through his work on the relationship between atmospheric pressure, temperature, and wind, which led to the development of numerical weather prediction models.
Knut Sydsæter is a Norwegian mathematician and author known for his contributions to the field of mathematics, particularly in relation to economic theory and mathematical methods. He is well-known for co-authoring the textbook "Mathematics for Economics and Finance," which is widely used in academic courses focused on mathematical applications in economics, finance, and related fields. His work often emphasizes the importance of mathematical tools in understanding economic concepts and models.
Ola Bratteli is likely a reference to a figure in the field of mathematics, specifically in the area of operator algebras and quantum groups. He is known for his contributions to the study of von Neumann algebras and related topics.
Stål Aanderaa is a Norwegian engineering company known for its expertise in the field of instrumentation and oceanographic studies. Founded in the early 20th century, the company specializes in the design and manufacture of sensors and systems used for monitoring and measuring various environmental parameters, particularly in marine and freshwater environments. This includes oceanographic buoys, water quality sensors, and equipment for meteorological data collection.
Bjørn Johan Landmark is a Norwegian mathematician known for his contributions in the field of mathematics, particularly in areas related to functional analysis, operator theory, and mathematical physics. He has published various research papers and has been involved in academic teaching and collaboration.
Bjørn Trumpy is a fictional character that has gained popularity on various social media platforms, often used in memes and comedic content. The name appears to be a combination of common Nordic names and a nod to former U.S. President Donald Trump. It can be associated with humorous or satirical content, sometimes playing on stereotypes or cultural references.
Bjørn Wiik does not appear to be a widely recognized figure or concept in public knowledge as of my last update in October 2023. It’s possible that he could be a private individual, a lesser-known public figure, or a fictional character.
Christopher Hansteen (1784–1873) was a Norwegian astronomer and geophysicist known for his contributions to the fields of geomagnetism and astronomy. He is particularly recognized for his work on the Earth's magnetic field and the development of theoretical models to understand it. Hansteen conducted extensive research on the magnetic declination and inclination, contributing to the understanding of how the magnetic field varies over the surface of the Earth.
Egil Hylleraas was a Norwegian physicist known for his contributions to theoretical chemistry and atomic physics. Born on March 21, 1898, he made significant advancements in the field of quantum mechanics, particularly in the calculation of electron correlation effects in multi-electron systems. His work played a crucial role in the development of quantum chemistry, including the Hylleraas coordinates, which are a set of variables used in the study of atomic systems.
Gabriel Gabrielsen Holtsmark is a Norwegian academic known for his work in the field of mathematics, particularly in number theory and algebra. He has been associated with various research and educational institutions in Norway.

Pinned article: 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 2.
    You can publish local OurBigBook lightweight markup files to either https://OurBigBook.com or as a static website
    .
    Figure 3.
    Visual Studio Code extension installation
    .
    Figure 4.
    Visual Studio Code extension tree navigation
    .
    Figure 5.
    Web editor
    . 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.
    Video 4.
    OurBigBook Visual Studio Code extension editing and navigation demo
    . Source.
  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