The Cosmic Background Explorer (COBE) was a satellite launched by NASA on November 18, 1989, and designed to study the cosmic microwave background radiation (CMBR) of the universe. The primary goals of COBE were to measure the CMBR's temperature and to explore the structure and anisotropies (small variations in temperature) within it.
The Qubic experiment (short for "QUBIC: Q & U B-mode Imaging Experiment") is a scientific project designed to investigate the cosmic microwave background (CMB) radiation. Specifically, it focuses on detecting and characterizing the polarization of the CMB, particularly the B-mode polarization, which is a potential signature of gravitational waves from the early universe, such as those produced during cosmic inflation.
The Geophysical Institute is typically an academic or research institution focused on the study of various geophysical phenomena, which may include areas such as geology, meteorology, oceanography, and seismology. These institutes are often affiliated with universities and conduct research, provide education, and develop technologies related to Earth sciences.
The Decennial Mineral Exploration Conferences are events that typically occur every ten years, focusing on the latest advancements, research, techniques, and practices in mineral exploration and mining. These conferences bring together geologists, geophysicists, mining engineers, environmental scientists, and industry professionals to share knowledge, discuss trends, and explore innovations in the field of mineral exploration. Usually, these conferences involve presentations, panel discussions, workshops, and networking opportunities.
The China Spallation Neutron Source (CSNS) is a major research facility located in Dongguan, Guangdong Province, China. It is designed for conducting advanced neutron scattering experiments, which are vital for a range of scientific fields, including materials science, biology, chemistry, and physics. The CSNS operates using a technique called spallation, where neutrons are produced by bombarding a target material (often made of heavy metals like tungsten or mercury) with high-energy protons.
In the context of National Physical Laboratory (NPL) measurement science, "Time" refers to precise timekeeping and measurements related to time standards. The NPL is known for its work in developing and maintaining national measurement standards, including time and frequency standards. MSF (Master Standard Frequency) is a time signal transmitted by the National Physical Laboratory in the UK, which provides accurate time and frequency information to users.
Dubna is a city in Russia, located about 125 kilometers northeast of Moscow, on the banks of the Volga River. It is known primarily for hosting the Joint Institute for Nuclear Research (JINR), an international research organization that conducts scientific research in nuclear physics and related fields. JINR was established in 1956 and has played a significant role in various scientific discoveries and collaborations, bringing together scientists from multiple countries.
Solving differential equations was apparently Lie's original motivation for developing Lie groups. It is therefore likely one of the most understandable ways to approach it.
It appears that Lie's goal was to understand when can a differential equation have an explicitly written solution, much like Galois theory had done for algebraic equations. Both approaches use symmetry as the key tool.
- www.researchgate.net/profile/Michael_Frewer/publication/269465435_Lie-Groups_as_a_Tool_for_Solving_Differential_Equations/links/548cbf250cf214269f20e267/Lie-Groups-as-a-Tool-for-Solving-Differential-Equations.pdf Lie-Groups as a Tool for Solving Differential Equations by Michael Frewer. Slides with good examples.
Bibliography:
A single exponential map is not enough to recover a simple Lie group from its algebra by
Ciro Santilli 40 Updated 2025-07-16
Most commonly refers to: exponential map.
Local symmetries appear to be a synonym to internal symmetry, see description at: Section "Internal and spacetime symmetries".
A local symmetry is a transformation that you apply a different transformation for each point, instead of a single transformation for every point.
Bibliography:
- lecture 3
- physics.stackexchange.com/questions/48188/local-and-global-symmetries
- www.physics.rutgers.edu/grad/618/lects/localsym.pdf by Joel Shapiro gives one nice high level intuitive idea:
- Quora:
The Shelter Island Conference, held in 1956, was a significant meeting in the history of the field of nuclear physics and related sciences. Organized by notable scientists, it took place on Shelter Island, New York, and it aimed to discuss scientific and technical aspects of nuclear proliferation and the peaceful uses of atomic energy following World War II. One of the key outcomes of the conference was the establishment of themes around the global impact of nuclear technology, including safety, security, and international cooperation.
"Fang Zhong" can refer to different concepts depending on the context. If you’re referring to traditional Chinese culture, "Fang Zhong" (方钟) might refer to a type of bell used in ancient China, specifically a square-shaped bell. However, without additional context, it's difficult to provide a specific answer. It could also refer to a person, a place, or even a concept in modern Chinese media.
Henriette Elvang is a notable figure in the field of theoretical physics, particularly known for her work in string theory and quantum gravity. She has contributed significantly to understanding various aspects of these complex subjects and has published numerous research papers on related topics. Her work often involves exploring the mathematical frameworks that underlie string theory and its implications for our understanding of fundamental physics.
Gerardo Beni is a prominent figure in computer science, particularly known for his contributions to the field of computer graphics, visualization, and geographic information systems (GIS). His work often focuses on the application of computer technology to solve complex problems in spatial data analysis and representation. Additionally, he has been involved in various research projects and has published numerous papers on topics related to his areas of expertise.
Gianaurelio Cuniberti is a notable physicist known for his work in the fields of materials science and nanotechnology. His research often focuses on quantum phenomena, particularly in condensed matter physics, and he has made significant contributions to the understanding of electrical properties of nanoscale materials.
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!
Intro to OurBigBook
. Source. We have two killer features:
- 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-calculusArticles 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/derivativeVideo 2. OurBigBook Web topics demo. Source. - 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.
- to OurBigBook.com to get awesome multi-user features like topics and likes
- as HTML files to a static website, which you can host yourself for free on many external providers like GitHub Pages, and remain in full control
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. - Infinitely deep tables of contents:
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





