The chronology of the universe refers to the timeline of events that occurred from the beginning of the universe to the present day. Here is a simplified overview of key milestones in this chronology: ### 1. The Big Bang (Approximately 13.8 billion years ago) - The universe begins with the Big Bang, a singularity that marks the origin of space, time, and all matter and energy. ### 2.
"The Big Bang" is a book by Indian author and historian of science, Dr. A. P. J. Abdul Kalam. The book explores not only the scientific concepts surrounding the Big Bang theory but also delves into the philosophical, cultural, and historical aspects of how humanity has come to understand the universe's origin. In the narrative, there's typically a mix of scientific explanation alongside personal reflections and insights from the author.
"The Beginning of Infinity: Explanations That Transform the World" is a book written by physicist and philosopher David Deutsch, published in 2011. In the book, Deutsch explores the nature of knowledge, reality, and the potential for human understanding and progress. He argues that through explanations—logical frameworks that help us understand the world—we can continue to expand our knowledge indefinitely.
Maurice Wilkes was a British computer scientist and a pioneer in the field of computing. He was born on June 26, 1913, and passed away on November 1, 2010. Wilkes is best known for designing and building the Electronic Delay Storage Automatic Calculator (EDSAC), one of the first stored-program computers, which he completed in 1949 at the University of Cambridge. He made significant contributions to the development of computer programming and architecture.
DisCoCat, short for "Distributional Compositional Category Theory," is a framework that combines ideas from distributional semantics and categorical theory in order to model the meaning of words and phrases in natural language. It was introduced as part of research in computational linguistics and philosophy of language, particularly in the context of understanding how meanings can be composed from the meanings of their parts.
The term "graded category" can refer to different concepts depending on the context in which it is used, including mathematics, education, and assessment. Here are a few interpretations: 1. **In Mathematics (Category Theory)**: A graded category is a category where the morphisms (arrows) can be assigned a "grade" or degree, often represented by integers.
The hydrophobic effect is a phenomenon in which nonpolar substances aggregate in aqueous solutions, minimizing their exposure to water. This effect is a key principle in biology, particularly in the folding of proteins and the formation of cellular membranes. ### Key Points: 1. **Nonpolar vs. Polar Molecules**: Water is a polar solvent, meaning it has a partial positive charge on one end and a partial negative charge on the other.
Lanthanide contraction refers to the phenomenon where the atomic and ionic radii of the lanthanide series elements (the 15 elements from lanthanum (La) to lutetium (Lu) in the periodic table) decrease progressively with increasing atomic number, despite the addition of electrons to the 4f subshell. This contraction is primarily caused by the ineffective shielding of the increasing nuclear charge by the 4f electrons.
Wafer bonding is a process used in semiconductor manufacturing where two or more semiconductor wafers are joined together to form a single, unified substrate. This technique is essential in various applications, including the production of integrated circuits, sensors, and MEMS (Micro-Electro-Mechanical Systems). There are several methods of wafer bonding, which can be categorized primarily into two types: 1. **Thermal Bonding**: This method involves applying heat and pressure to bond the wafers together.
A low-barrier hydrogen bond (LBHB) is a type of hydrogen bond that has a shorter distance and a lower energy barrier compared to typical hydrogen bonds. In a typical hydrogen bond, the interaction between a hydrogen atom and an electronegative atom (like oxygen or nitrogen) results in a relatively stable bond, but the energy barrier for forming or breaking such bonds is usually higher. In contrast, LBHBs exhibit characteristics that allow them to form more easily and break more readily.
Chinese mathematicians refer to mathematicians from China or those of Chinese descent who have made significant contributions to the field of mathematics throughout history and into modern times. Chinese mathematics has a rich history that dates back thousands of years, characterized by various developments and inventions in numeration, geometry, algebra, and number theory.
A step function is a type of piecewise function that changes its value at specific intervals, resulting in a graph that looks like a series of steps. These intervals can be defined by any rules, leading to a function that stays constant over each interval before jumping to a new value at the boundaries. ### Key Characteristics of Step Functions: 1. **Piecewise Definition**: A step function can be defined using different constant values over different ranges of the input variable.
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!
Intro to OurBigBook
. Source. We have two killer features:
- 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-calculusArticles 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/derivativeVideo 2. OurBigBook Web topics demo. Source. - 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.
- to OurBigBook.com to get awesome multi-user features like topics and likes
- as HTML files to a static website, which you can host yourself for free on many external providers like GitHub Pages, and remain in full control
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. - Infinitely deep tables of contents:
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





