An "augmented sphenocorona" is a type of geometric figure that belongs to the category of polyhedra. Specifically, it is a variant of the sphenocorona—one of the Archimedean solids. The term "augmented" indicates that some vertices or faces have been altered or added to the original sphenocorona to create a new shape. A sphenocorona itself is characterized by having a combination of triangular and quadrilateral faces.
The compound of five octahedra, also known as the "pentaoctahedron," is a geometric structure formed by combining five octahedra in a specific arrangement. It can be viewed as a complex polyhedron or a space-filling arrangement. In polyhedral geometry, such compounds often demonstrate interesting symmetrical properties and can be visualized in three-dimensional space.
The compound of six tetrahedra is a geometric structure formed by the combination of six tetrahedra intersecting in a symmetric arrangement. In this compound, the tetrahedra are arranged in such a way that they share vertices, edges, and faces, creating a complex polyhedral configuration. This compound can also be described mathematically as a polyhedral arrangement with an intricate symmetry. It is an interesting example of a polyhedral compound in three-dimensional space and showcases the fascinating interplay between geometry and symmetry.
A compound of twelve pentagonal prisms refers to a geometric figure formed by arranging twelve pentagonal prisms in a specific way. In three-dimensional geometry, a pentagonal prism is a polyhedron with two parallel pentagonal bases connected by rectangular faces. When we talk about a compound of twelve pentagonal prisms, this can imply various configurations depending on how the prisms are arranged or combined.
The great retrosnub icosidodecahedron is a non-convex uniform polyhedron and is one of the Archimedean solids. It is characterized by its complex structure, which consists of a combination of regular polygons. Specifically, the great retrosnub icosidodecahedron has the following properties: - **Faces**: It consists of 62 faces, which include 20 regular triangles, 12 regular pentagons, and 30 squares.
An enneadecagon is a polygon with 19 sides and 19 angles. The name derives from the Greek words "ennea," meaning nine, and "deka," meaning ten, reflecting its 19 sides (9 + 10 = 19). Each internal angle of a regular enneadecagon is approximately 168.53 degrees.
The icositruncated dodecadodecahedron is a convex archimedean solid, which belongs to the category of polyhedral shapes in geometry. It is formed by truncating the vertices of a dodecadodecahedron (also known as a snub dodecadodecahedron) in such a way that it maintains a symmetrical structure.
The medial rhombic triacontahedron is a type of Archimedean solid that can be characterized as a convex polyhedron. It is derived from a rhombic triacontahedron, which has 30 rhombic faces, by truncating (or cutting off) the vertices of the original solid. This truncation results in the creation of hexagonal faces at the vertices that were removed.
The "Pentagrammic crossed-antiprism" is a type of polyhedron that belongs to the family of antiprisms. Specifically, it is a variation of the antiprism that involves a pentagram (a five-pointed star) instead of a regular polygon as its base faces. In geometrical terms, a crossed-antiprism consists of two parallel, congruent bases that are polygonal faces, connected by a set of triangular faces.
The National Center for Women & Information Technology (NCWIT) is a nonprofit organization based in the United States that focuses on increasing the participation of women and girls in computing and technology fields. Founded in 2004, NCWIT aims to change the culture of technology and support initiatives that enhance the involvement of women in these areas.
"New production" can refer to different concepts depending on the context in which it is used. Here are a few potential interpretations: 1. **In the Arts**: In theater, film, or television, "new production" often refers to a newly created performance or work that has not been previously produced. This can include original plays, films, or adaptations of existing works that are being staged or filmed for the first time.
Nigel Goldenfeld is a prominent physicist known for his work in theoretical physics, particularly in the fields of statistical mechanics, complex systems, and biological physics. He has contributed to understanding phase transitions, non-equilibrium phenomena, and the application of physical principles to biological systems. Goldenfeld is also recognized for his academic roles, serving as a professor at various institutions, and for his involvement in scientific education and outreach.
The Leinster Group is a geological formation located in eastern Ireland, primarily in the province of Leinster. It consists of a sequence of rocks that were formed in the late Paleozoic era, specifically during the Carboniferous period. The group is notable for its varied sedimentary deposits, which include sandstones, mudstones, and limestones.
The nuclear history of the Soviet Union is a complex narrative that reflects the development of nuclear technology, arms race with the West, and significant geopolitical implications throughout the 20th century. Here’s an overview of key milestones and events in this history: ### Early Development (1930s - 1940s) 1.
Outgassing refers to the release of gas that was dissolved, trapped, frozen, or absorbed in some material. This phenomenon is particularly significant in various scientific fields, including materials science, environmental science, and space exploration. In the context of materials, outgassing can occur when certain materials, such as plastics, metals, or composites, are heated or placed under vacuum conditions.
Oxygen permeability refers to the ability of a material to allow oxygen molecules to pass through it. It is often an important property of various materials in fields such as packaging, textiles, membranes, and coatings. The measurement of oxygen permeability is crucial in applications where the preservation of products or the regulation of oxygen exposure is essential, such as in the food packaging industry, medical devices, and storage of sensitive materials.
Oxyselenides are a class of chemical compounds that contain selenium (Se) and oxygen (O) in their molecular structure, typically in combination with other elements, such as metals or nonmetals. The general formula for oxyselenides can vary depending on the specific compound, but they are characterized by the presence of Se-O bonds. Oxyselenides can exhibit a range of properties and reactivities, often depending on the oxidation state of selenium and the other constituents in the compound.
Paschen's law describes the relationship between the breakdown voltage of a gas (the voltage at which it becomes conductive) and the pressure of the gas as well as the distance between the electrodes. This law is important in the field of plasma physics, electrical engineering, and gas discharge phenomena.

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