Karl F. Sundman was a Finnish mathematician known for his work in mathematical astronomy and celestial mechanics. He is best known for developing methods to solve the three-body problem, specifically through the use of series expansion solutions. His contributions were significant in the field of orbital mechanics, and he provided insights and techniques that have been utilized in the study of gravitational interactions between celestial bodies. Sundman's series represent a particular approach to obtaining a solution to the equations of motion governing such systems.
Raimo Hämäläinen is a Finnish academic known for his contributions to the fields of operations research and management science. He has authored numerous publications and is recognized for his work in areas such as decision-making, supply chain management, and systems modeling. Hämäläinen has been affiliated with various universities and institutions, where he has also been involved in teaching and mentoring students in related disciplines.
Ferdinand Verbiest (1623–1688) was a Flemish Jesuit missionary, astronomer, and philosopher who is best known for his work in China during the Qing dynasty. He played a significant role in promoting Western science and technology in the region. Verbiest was part of the Jesuit missions that sought to spread Christianity while also engaging in cultural and scientific exchange.
Godfried Wendelen is a historical figure known primarily for his role as a Flemish mathematician and astronomer in the 17th century. He is recognized for his contributions to the field of mathematics, particularly in relation to geometry and numerical methods. Wendelen's work often involved the use of logarithms and the development of various mathematical theories. He also contributed to the field of astronomy by working on problems related to celestial navigation and planetary motion.
Gaston Albert Gohierre de Longchamps is not a widely recognized figure in common historical, cultural, or scientific references as of my last knowledge update in October 2023. It’s possible that he could be a figure of local or niche interest, a fictional character, or someone who has gained prominence after my last training data.
Georges Fournier was a French Jesuit priest known for his contributions to the Catholic Church and Jesuit scholarship. He is not one of the most widely recognized figures in Jesuit history, so details about him may be limited. Jesuits, or the Society of Jesus, are a religious order within the Catholic Church founded by St. Ignatius of Loyola in the 16th century, known for their focus on education, intellectual rigor, missionary work, and social justice.
Joceline Lega does not appear to be a widely recognized or notable figure based on the information available up to October 2023. It is possible that the name could refer to a private individual or someone with a more specific or localized importance, perhaps in a niche field or community.
Miedema's model is a theoretical framework used to describe and analyze the phenomenon of phase transformations in materials, particularly in the context of solid-state reactions. Developed by the Dutch scientist A. Miedema in the 1980s, this model focuses on the thermodynamics and kinetics of phase changes, such as the formation of new phases in alloys and intermetallics.
Mycelium-based materials are products derived from the mycelium, which is the root structure of fungi. Mycelium consists of a network of fine, thread-like structures called hyphae. These materials are gaining attention for their sustainable and environmentally friendly properties. Here are some key points about mycelium-based materials: 1. **Sustainability**: Mycelium can be grown on agricultural waste and other organic materials, making it a sustainable choice for material production.
Nanofluidic circuitry refers to the manipulation and control of fluids at the nanoscale, typically in channels or devices that have dimensions on the order of nanometers. This technology leverages the unique physical and chemical properties of fluids when confined to such small scales, which differ significantly from their behavior in larger-scale environments.
Paris' Law, also known as Paris' fatigue law, describes the rate at which fatigue crack growth occurs in materials that are subjected to cyclic loading. It is a fundamental concept in the field of fracture mechanics and materials science.
Nitinol 60 is a specific alloy of Nitinol, which is a type of nickel-titanium alloy known for its unique shape-memory and superelastic properties. Nitinol typically exists in two phases: austenite and martensite. The alloy exhibits the ability to return to a predefined shape when heated above a certain temperature, or to deform significantly while still being able to return to its original shape when the stress is removed (superelasticity).
Secondary organic aerosol (SOA) refers to fine particles (aerosols) that form in the atmosphere from the gas-phase oxidation of organic compounds. These organic compounds, which can originate from both anthropogenic (human-made) and biogenic (natural) sources, undergo chemical reactions when they react with oxidizing agents, such as hydroxyl radicals (•OH) or ozone (O3).
Nondestructive testing (NDT) refers to a variety of analytical techniques used to evaluate the properties of a material, component, or system without causing any damage to it. The primary goal of NDT is to identify potential defects, material properties, and structural integrity in objects or systems while keeping them in service. NDT methods are widely used in industries such as aerospace, automotive, construction, manufacturing, and oil and gas, where safety and reliability are critical.
Severe Plastic Deformation (SPD) refers to a set of advanced processing techniques used to significantly improve the mechanical properties of materials, particularly metals, through large strains without a significant increase in temperature. The main objective of SPD is to refine the microstructure of the material, leading to a high density of dislocations and a fine-grained structure, which ultimately enhances strength, hardness, ductility, and other properties.
Poly(amidoamine), commonly referred to as PAMAM, is a type of dendritic polymer that is characterized by its branched structure. It is a synthetic polymer that comprises a central core atom (often a nitrogen atom) from which multiple amidoamine branches extend. PAMAM is produced through iterative processes of reactions involving amines and acids, allowing for the precise control of the polymer's architecture, including its size and functionalization.
Redux is a predictable state management library for JavaScript applications, often used with frameworks like React. It provides a centralized store to manage the application's state in a way that is easier to understand and debug. Redux follows a unidirectional data flow and uses actions to describe state changes, reducers to update the state, and a store to hold the application state. The term "adhesive" in relation to Redux is not commonly recognized or associated directly with the library itself.
Reinforced concrete is a composite material that combines concrete with reinforcement, typically in the form of steel bars (rebar) or mesh. The primary purpose of adding reinforcement is to improve the tensile strength of concrete, which is strong in compression but weak in tension. This combination allows reinforced concrete to withstand various types of loads and stresses more effectively than plain concrete.
In materials science, "slip" refers to the microscopic process by which dislocations move through a crystal lattice, allowing the material to deform under stress. This mechanism is a crucial aspect of plastic deformation in metals and other crystalline materials. Here are some key points about slip: 1. **Dislocations**: Slip primarily involves dislocations, which are linear defects within the crystal structure. These dislocations can move under applied stress, facilitating the rearrangement of atoms in the material.
SU-8 is a type of epoxy-based negative photoresist that is widely used in microfabrication processes. Developed originally at the IBM Thomas J. Watson Research Center in the 1990s, SU-8 stands for "structural upgrade 8" and is notable for its ability to create thick, high-resolution patterns and structures.

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