The phonautograph is an early device invented by Édouard-Léon Scott de Martinville in 1857. It was the first known machine capable of recording sound waves, although it was not designed to reproduce them. The device functioned by capturing sound vibrations and translating them into visible traces on a medium, typically a soot-coated piece of paper or a cylinder.
Transitional ballistics is a branch of ballistics that studies the behavior of projectiles as they transition from the subsonic to supersonic states, or vice versa. This transition occurs at a critical speed, known as the speed of sound in air (approximately 343 meters per second or 1,125 feet per second at sea level).
The Catterline Cartie Challenge is a unique event held in the village of Catterline in Scotland. It involves a thrilling race featuring homemade soapbox cars, commonly referred to as "carties." Participants create their own non-motorized vehicles and compete by racing them down a designated hill or track. The event is not only about speed but also encourages creativity, engineering skills, and community spirit, as local residents and visitors gather to watch the races.
The Franssen effect is a phenomenon in psychology related to how individuals perceive time, particularly in situations involving anticipation or expectation. It suggests that when someone is waiting for an event to occur, their perception of time may seem to slow down, leading them to feel like time is passing more slowly than it actually is. This effect can be particularly noticeable in high-stress or exciting situations, such as before a performance or during a significant life event.
Fred Dretske (1932–2013) was an influential American philosopher, known primarily for his work in the philosophy of mind, philosophy of language, and epistemology. He is particularly recognized for his contributions to theories of information, knowledge, and the relationship between perception and belief. One of Dretske’s key ideas is the concept of "information" as it pertains to knowledge and understanding.
The Freidlin–Wentzell theorem is a significant result in the field of stochastic analysis, particularly in the study of large deviations in dynamical systems influenced by random noise. It is named after the mathematicians Mark Freidlin and Walter Wentzell, who contributed to the theory in the context of stochastic processes. In a general sense, the theorem deals with the behavior of trajectories of stochastic processes governed by a weakly deterministic force and subject to random perturbations.
Wei-Kan Chu is a prominent figure in the field of physics, particularly known for his research in solid-state physics and materials science. His work has focused on areas such as superconductivity, magnetism, and magnetic materials. Chu has also contributed to the development of new experimental techniques and has authored numerous research papers that have significantly advanced the understanding of complex materials. In addition to his research contributions, Wei-Kan Chu has been involved in academic leadership and has held positions at various institutions.
A "Fresh variable" typically refers to a variable in programming, mathematics, or logic that has not been previously used or defined in a given context. This concept is often utilized in various areas such as: 1. **Symbolic Logic**: In logic and formal proofs, a fresh variable is introduced to avoid conflict with existing variables. It ensures that the variable represents a distinct entity that does not interfere with other variables or expressions.
Valence Bond Theory (VBT) is a fundamental theory in quantum chemistry that describes the formation of chemical bonds between atoms. It focuses on the interactions of atomic orbitals to explain how bonds are formed and how the properties of molecules arise from these bonds.
Van Zandt Williams is likely referring to a prominent American lawyer and author known for his work in the fields of antitrust law and intellectual property rights. It's possible that the name is also connected to a specific firm, publication, or legal case. However, without additional context, it's difficult to pinpoint exactly what "Van Zandt Williams" refers to.
The Fröhlich Prize is an award presented by the International Society for the Advancement of Superconductivity (ISAS) to recognize outstanding contributions to the field of superconductivity. Named after the physicist Johannes Fröhlich, the prize honors individuals or groups who have made significant advancements in superconducting materials, phenomena, or applications. The award typically emphasizes contributions that are innovative and impactful within the scientific community, promoting further research and development in superconductivity.
A \( (0, 1) \)-simple lattice, also known simply as a simple lattice, is an important concept in the field of mathematical lattices, particularly relating to order theory and combinatorics. In general, a lattice is a partially ordered set in which any two elements have a unique least upper bound (supremum, often denoted as \(\vee\)) and a unique greatest lower bound (infimum, often denoted as \(\wedge\)).
The 19th century was a significant period for the development of physics in America, marked by the contributions of several pivotal figures who laid the groundwork for modern science. Here are a few key American physicists from that era: 1. **Benjamin Thompson (Count Rumford)** - Known for his work in thermodynamics and the nature of heat, he conducted important experiments on heat and calorimetry.
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





