The transition state refers to a high-energy, unstable configuration during a chemical reaction that represents the point at which reactants are transformed into products. It is a temporary state that occurs at the peak of the potential energy barrier that separates reactants from products. Key characteristics of the transition state include: 1. **Maximum Energy**: The transition state is associated with the maximum potential energy along the reaction pathway.
Particle-size distribution (PSD) refers to the measurement and characterization of the sizes of individual particles in a given sample of material. It provides information about the proportions of different particle sizes and is important in various fields such as material science, pharmacology, geology, and environmental science.
Cadet's fuming liquid, also known as "Cadet's fuming liquid," is an aqueous solution of nitrogen dioxide (NO2) in nitric acid (HNO3). This solution is characterized by its intense yellow-brown color due to the presence of nitrogen dioxide gas, which can dissolve in the acid to form a mixture. Cadet's fuming liquid is used in various chemical processes, including the production of explosives and in the context of certain types of chemical synthesis.
The Ouzo effect is a phenomenon that occurs when an anise-flavored spirit, such as ouzo, raki, or absinthe, is diluted with water, causing the liquid to turn cloudy or milky. This effect is primarily due to the presence of anethole, a compound found in anise, which is soluble in alcohol but not in water.
Carboryne is a hypothetical chemical species that is a type of carbon allotrope, specifically a form of carbon that contains a carbon atom bonded to a boron atom. The term “carboryne” is derived from the combination of "carbon" and "boron" and is believed to possess unique structural and electronic properties. Theoretical studies and models suggest that carborynes could have applications in materials science and nanotechnology due to their potential for interesting chemical reactivity and stability.
Iron-nickel clusters refer to nanoscale aggregates composed of iron (Fe) and nickel (Ni) atoms. These clusters have garnered interest in various scientific fields due to their unique properties and potential applications in areas like catalysis, magnetic materials, nanotechnology, and materials science. ### Key Characteristics: 1. **Composition and Structure**: Iron-nickel clusters can vary in size and stoichiometry (the ratio of iron to nickel), leading to different structural and electronic properties.
Thiolate-protected gold clusters are nanoparticles comprised of gold atoms that are stabilized by thiolate ligands, which are sulfur-containing organic molecules. These clusters typically consist of a few to several dozen gold atoms and are characterized by their unique electronic, optical, and chemical properties, which differ from larger gold nanoparticles or bulk gold.
CIDNP stands for Chemically Induced Dynamic Nuclear Polarization. It is a phenomenon observed in certain spectroscopic techniques, particularly in the field of nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR) spectroscopy. CIDNP occurs when the polarization of nuclear spins is created and manipulated through chemical reactions that involve radical species. This effect can result in enhanced signals for certain nuclei, allowing for the observation of reaction dynamics and the study of mechanisms in systems involving radicals.
The Donnan potential refers to the electrochemical potential difference that arises across a semipermeable membrane when there is an unequal distribution of ions on either side of the membrane, typically due to the presence of impermeable solutes. This phenomenon is named after the chemist Frederick G. Donnan, who studied the effects of ionic distribution in colloidal systems. In a typical scenario, when a semipermeable membrane separates two solutions, the membrane allows the movement of certain ions but not others.
The term "Cliff" can refer to several different things depending on the context: 1. **Geographical Feature**: A cliff is a steep face of rock and earth. Cliffs can be found in various natural settings, including coastlines, mountains, and canyons. 2. **Cliffhanger**: In storytelling, a cliffhanger is a plot device in which a story ends at a suspenseful or dramatic moment, leaving the outcome uncertain and the audience eager for more.
Hess's law, also known as Hess's Law of Constant Heat Summation, states that the total enthalpy change for a chemical reaction is the same, regardless of whether the reaction occurs in one step or multiple steps. In other words, the enthalpy change of a reaction is independent of the path taken from reactants to products.
Macromolecular crowding refers to the phenomenon that occurs in cells and other biological systems where large molecules (macromolecules) such as proteins, nucleic acids, and polysaccharides are packed closely together. This high concentration of macromolecules can significantly affect biochemical processes, molecular interactions, and the physical properties of solutions. In crowded environments, the following effects are often observed: 1. **Altered Reaction Rates**: Crowding can enhance or inhibit the rates of biochemical reactions.
Marcus theory, named after chemist Rudolph A. Marcus, is a theoretical framework used to describe electron transfer reactions in chemistry. Specifically, it provides insights into the rate of electron transfer processes, which are fundamental to many chemical reactions, including those in electrochemistry, biological systems, and materials science. The key aspects of Marcus theory include: 1. **Potential Energy Surface**: The theory describes the energy changes associated with the electron transfer reaction using a potential energy surface.
Organizational stakeholders are individuals or groups that have an interest in, or are affected by, the activities and decisions of an organization. They can influence the organization’s success and are, in turn, influenced by its activities. Stakeholders can be categorized into several groups: 1. **Internal Stakeholders**: These include employees, managers, and owners. They are directly involved in the organization and have a vested interest in its performance.
Iselin Bank is a financial institution that operates primarily in Iselin, New Jersey. Like many banks, it likely offers a range of services including personal banking, business banking, loans, mortgages, and financial advising.
National Pipe Thread (NPT) is a U.S. standard for tapered threads used on threaded pipes and fittings. It is primarily used in plumbing and piping systems to create a tight seal. Here are some key points about NPT: 1. **Tapered Design**: NPT threads are tapered, which means that the diameter of the threads decreases along the length of the pipes. This design allows the threads to create a tighter seal as they are screwed together.
Lynne Talley is an American oceanographer known for her contributions to the fields of oceanography and climate science. She has conducted extensive research on ocean circulation, particularly in the Southern Ocean, and has played a significant role in understanding how ocean processes impact climate change and global climate systems. Lynne Talley has also been involved in various scientific initiatives, contributing to our understanding of oceanographic data and the implications of ocean currents on climate variability.
A pipe is a hollow cylinder or tube used to convey fluids (liquids and gases) from one location to another. Pipes are essential components in various systems, including plumbing, heating, irrigation, and industrial processes. They can be made from a wide range of materials, such as: - **Metal**: Steel, copper, and aluminum are commonly used for their strength and durability. - **Plastic**: PVC, polyethylene, and polybutylene are lightweight and resistant to corrosion.
**Piping and Plumbing Fitting** refers to the components and systems used to transport fluids (such as water, gas, or sewage) in residential, commercial, and industrial buildings. Here’s a breakdown of both terms: ### Piping **Piping** refers to the system of pipes that convey fluids. Pipes are typically made from materials such as: - **PVC (Polyvinyl Chloride)**: Commonly used for drainage, waste, and vent applications.
A thread protector is a device used to safeguard the threads of a pipe or a fitting, preventing damage or contamination when the part is not in use. Thread protectors are commonly made from materials like plastic or metal and are typically used in various industries, including oil and gas, plumbing, and construction. They help to keep the threads clean, free from debris, and protected from physical damage, ensuring that the threads remain functional for future use.

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