Ali Akbar Moosavi-Movahedi is an Iranian cleric and scholar known for his religious leadership and contributions to Islamic thought, particularly within the context of Shia Islam. He has been involved in various educational and social initiatives, promoting Islamic teachings and community welfare. His work often emphasizes the importance of moral and ethical values in Islamic practice.
Heat transfer physics is the branch of physics that studies the movement of thermal energy (heat) from one physical system to another due to temperature differences. It involves the mechanisms through which heat is transferred and the laws governing these processes. Heat transfer can occur in three primary ways: 1. **Conduction**: This is the transfer of heat through a solid material without the motion of the material itself. Heat is transferred through molecular collisions and vibrations.
Convection is a mode of heat transfer that occurs through the movement of fluids (liquids and gases). It is one of the three primary mechanisms of heat transfer, the other two being conduction and radiation. In convection, heat is transferred by the bulk movement of the fluid, carrying thermal energy with it.
Negative thermal expansion (NTE) is a phenomenon where certain materials contract rather than expand when heated. Unlike most materials, which exhibit a positive thermal expansion coefficient and expand as their temperature increases, materials exhibiting NTE demonstrate a decrease in volume with increasing temperature within certain temperature ranges. This behavior can be attributed to specific structural characteristics of the material at the atomic or molecular level.
Evaporative cooling is a process that occurs in atomic physics, particularly in the context of ultracold gases. It refers to the technique used to achieve and maintain very low temperatures in a system of atoms or particles. Here's how it works: 1. **Basic Concept**: In a system of particles, the temperature is related to the average kinetic energy of the particles. Higher energy particles move faster, while lower energy particles move slower. Evaporative cooling takes advantage of this distribution of energies.
The Massieu function is used in the field of thermodynamics and statistical mechanics. It is a mathematical function that relates to the properties of a thermodynamic system and is defined in terms of the system's free energy. In thermodynamic contexts, the Massieu function \( \phi \) is typically expressed as: \[ \phi = -\frac{F}{T} \] where: - \( F \) is the Helmholtz free energy of the system.
Natural uranium is uranium that occurs in nature and is typically found in ore. It consists mainly of three isotopes: uranium-238 (about 99.3%), uranium-235 (about 0.7%), and a trace amount of uranium-234. The most significant isotope for nuclear applications is uranium-235, which is fissile and can sustain a nuclear chain reaction, making it valuable for nuclear power generation and nuclear weapons.
Maxwell's thermodynamic surface is a conceptual representation in thermodynamics that illustrates the relationship between different thermodynamic variables, particularly entropy, volume, and energy. It is typically depicted as a multidimensional surface in a three-dimensional space where the axes represent entropy (S), volume (V), and internal energy (U). The surface provides a visual framework to understand how changes in one variable can affect the others and helps to derive relationships between different thermodynamic properties.
Rubber elasticity refers to the remarkable ability of rubber and rubber-like materials to stretch and return to their original shape after being deformed. It is a key characteristic of elastomers, which are a class of polymers. The underlying principle of rubber elasticity is based on the molecular structure of rubber, which consists of long, tangled chains of polymer molecules. When a force is applied, these chains are pulled apart, allowing the material to stretch.
The tog is a unit of thermal insulation used primarily in the textile and bedding industries. It measures the thermal resistance of materials, particularly duvets and quilts, indicating how warm the bedding will keep a person during sleep. The tog rating usually ranges from about 1 to 15, with lower tog values (1-4) indicating lighter and cooler bedding suitable for warmer weather, while higher tog values (10-15) indicate warmer bedding for colder conditions.
Alan Reid is a mathematician known for his contributions to the fields of topology and geometric group theory. He has worked extensively on topics related to 3-manifolds, particularly in relation to the study of hyperbolic geometry and the topology of manifolds. His research often intersects with areas such as knot theory and the structure of groups, including the interplay between algebra and geometry. Reid has authored several influential papers and has been involved in various academic discussions and conferences related to his areas of expertise.
Anatoly Fomenko is a Russian mathematician and historian known for his controversial theories regarding history and chronology. Born on March 13, 1945, Fomenko is a professor at Moscow State University, where he has contributed to various fields, including topology and geometry. Fomenko is best known for his work on "New Chronology," a theory that challenges conventional historical timelines.
As of my last knowledge update in October 2021, there isn't a widely recognized individual named Eric van Douwen. It's possible that he could be a private individual, a professional in a specific field, or a public figure who has gained prominence more recently.
Hans Hahn (1879–1934) was an Austrian mathematician known for his significant contributions to functional analysis, topology, and the foundations of mathematics. He was a member of the Vienna Circle, a group of philosophers and scientists who were central to the development of logical positivism and scientific philosophy in the early 20th century. Hahn is best remembered for the Hahn-Banach theorem in functional analysis, which is a fundamental result concerning the extension of linear functionals.
Kenneth Millett is a mathematician known for his work in various areas of mathematics, including topology, algebraic topology, and mathematical biology. He has made significant contributions to the understanding of shapes and spaces, particularly in relation to the classification of manifolds and the study of knot theory. Millett has also been involved in educational initiatives and research related to mathematics.
Sze-Tsen Hu is not a widely recognized name in popular culture, science, or history based on available information up to October 2023. It is possible that Sze-Tsen Hu could refer to a specific individual, perhaps in academia or another specialized field, but without additional context, it is hard to provide more detailed information.
Victor Goryunov is a notable scientist and researcher, primarily recognized in the field of mathematics, specifically in the areas of nonlinear dynamics, mathematical physics, and applied mathematics. However, without additional context, it's difficult to provide specific details about his contributions or the aspects of his work that you might be interested in.
William Francis Pohl is best known as an American mathematician recognized for his contributions to the field of mathematics, particularly in areas such as graph theory and topology.
Zoltán Tibor Balogh does not appear to be a widely recognized figure based on the information available up until October 2023. It's possible that he could be a professional in a specific field, such as academia, art, or science, but if he is not a notable public figure, there may be limited information available.
The Andreotti–Frankel theorem is a result in complex geometry, specifically in the context of Stein manifolds and the topology of complex spaces. The theorem is named after the mathematicians A. Andreotti and T. Frankel, who formulated it in the 1960s. The essential statement of the Andreotti–Frankel theorem pertains to the existence of non-trivial holomorphic (complex) forms on certain types of complex manifolds.

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