A440, also known as the pitch standard, refers to the musical pitch of A above middle C, which is set at a frequency of 440 Hz. This means that the note A440 is the sound frequency that vibrates 440 times per second. A440 is commonly used as a tuning reference for musical instruments, ensuring that they are in tune with one another. The concept of A440 has become a standard in the music industry, widely adopted across various genres and styles.
Aba Andam is a popular traditional dish from Ghana, often associated with the Akan people. It is a type of porridge made from fermented corn dough, which is usually mixed with water and cooked to create a smooth, thick consistency. The dish can be served hot or cold and is often enjoyed with various accompaniments, such as sugar, milk, honey, or fruits. Aba Andam is commonly consumed for breakfast or as a snack and is valued for its nutritional benefits.
Abbas Anvari could refer to a few different things depending on the context, but the most common reference is to a notable Iranian scientist, mathematician, and poet from the 11th century. He is known for his contributions to science and literature during the Islamic Golden Age.
Abdominal ultrasonography, commonly known as an abdominal ultrasound, is a non-invasive imaging technique that uses high-frequency sound waves to create images of the organs and structures within the abdomen. This diagnostic tool is widely used to evaluate various conditions affecting organs such as the liver, gallbladder, pancreas, kidneys, spleen, and blood vessels.
Abdul Jerri is a notable figure in the field of mathematics, particularly recognized for his work in the areas of functional analysis and approximation theory. He is known for his contributions to various mathematical theories and for authoring textbooks and papers that have been influential in advancing understanding in these areas. Additionally, he has served in academic roles, contributing to the education of future mathematicians.
Abraham Bennet is a figure known for his work in the field of mathematics, particularly in the study of calculus and the development of methods for solving equations in the 18th century. He is often associated with the early developments of calculus and contributed to the knowledge of mathematical analysis during that period. His writings and research were significant in the context of the mathematical advancements of his time.
Abraham Wald was a Hungarian-born statistician, widely recognized for his contributions to statistical decision theory and mathematical statistics, particularly during World War II. He was born on October 31, 1902, and went on to pursue a distinguished academic career. One of Wald's most notable contributions is the concept of "survivorship bias," which he illustrated through his work with the U.S. military. During the war, he was tasked with analyzing the effectiveness of aircraft armor.
An absorbing set, often encountered in the context of dynamical systems and differential equations, refers to a type of set within a mathematical space that has special properties regarding the trajectories of points in that space.
The term "abstract economy" is not commonly defined within economic literature, so its interpretation can vary. However, it generally refers to the theoretical or conceptual framework for understanding economic processes and relationships without being confined to specific real-world applications. 1. **Theoretical Constructs**: Abstract economy often involves the use of models, theories, and mathematical frameworks to represent and analyze economic phenomena.
An abstract elementary class (AEC) is a general framework in model theory that captures certain structures and their relationships in a flexible way. The concept was introduced to study models of various kinds of logical theories, particularly in settings where the standard notions of elementary classes (as in first-order logic) are insufficient.
Academy Plastic Model is a well-known manufacturer of plastic model kits, primarily focused on aircraft, military vehicles, and ships. Founded in South Korea in 1969, Academy has built a reputation for producing high-quality kits that are popular among hobbyists and model builders worldwide. The company offers a wide range of scales and types of models, including scale models for beginners as well as more advanced kits for experienced modelers.
As of my last update in October 2023, Pluteo 29.1 is a version of the Pluteo software, which is commonly associated with cloud-native solutions for managing and deploying applications. Pluteo typically refers to a platform or service that facilitates microservices architecture, Kubernetes management, or similar technologies in the cloud space. The specific features and enhancements in Pluteo 29.1 would depend on the release notes or documentation provided by the developers.
Accurate Miniatures was a model kit manufacturer known for producing high-quality plastic model kits, primarily focusing on aircraft and military vehicles. Founded in the early 1990s, the company gained a reputation for its attention to detail, accuracy, and the use of advanced molding techniques. Many of its kits represented historical aircraft and vehicles, catering to hobbyists and modelers who appreciated authenticity and realism in their builds.
ACS Applied Energy Materials is a peer-reviewed scientific journal published by the American Chemical Society (ACS). It focuses on research related to materials science and engineering, particularly in the context of energy applications. The journal covers a wide range of topics, including but not limited to: - Energy storage materials (e.g., batteries, supercapacitors) - Energy conversion materials (e.g.
The term "action axiom" can refer to concepts in different fields, such as philosophy, mathematics, or computer science, but it may not have a specific widely recognized definition across all disciplines. Here are a couple of interpretations based on different contexts: 1. **Philosophical Context**: In philosophy, especially in the study of action theory, an action axiom might refer to basic principles or assumptions about the nature of human actions, intentions, or moral responsibility.
Adaptive autonomy refers to a system's ability to adjust its level of independence and decision-making capabilities based on the context, goals, and environmental conditions it encounters. This concept is particularly relevant in fields like robotics, artificial intelligence, and autonomous systems, where machines need to perform tasks that may require varying degrees of autonomy. In practical terms, adaptive autonomy allows a system to: 1. **Assess Situational Awareness**: Evaluate the current environment, understand requirements, and recognize unexpected changes or challenges.
Latvia is divided into several administrative divisions. The country is primarily divided into **two main levels** of administrative divisions: **provinces (or regions)** and **municipalities**. As of now, the administrative structure includes: ### 1. **Regions (Novadi)**: Latvia consists of **seven regions**, which are often referred to as "novadi" in Latvian.
Polar decomposition is a mathematical concept in linear algebra that pertains to the representation of a matrix as the product of two specific types of matrices.
Japanese bioinformaticians are scientists and researchers from Japan who specialize in bioinformatics, a multidisciplinary field that combines biology, computer science, mathematics, and statistics to analyze and interpret biological data. Bioinformaticians in Japan work on various aspects of biological research, including genomics, proteomics, transcriptomics, and systems biology. They develop algorithms, software tools, and databases to facilitate the analysis of complex biological information, often related to areas like medicine, disease research, agriculture, and environmental science.
"Advanced Energy Materials" refers to a field of materials science focused on developing new materials and technologies for energy applications. This includes the design, synthesis, characterization, and application of materials that enhance energy generation, storage, and efficiency. Key areas within this field include: 1. **Photovoltaic Materials**: Technologies for solar energy conversion, including silicon-based materials, thin-film technologies, and emerging materials like perovskites.

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