Direction finding (DF) is a technique used to determine the direction of the source of an electromagnetic signal, such as radio waves. It involves measuring the angle from which these signals are arriving at a receiver, and is utilized in various fields, including telecommunications, navigation, and surveillance. There are several methods of direction finding, which can generally be categorized into two main types: 1. **Passive Direction Finding**: This involves receiving signals emitted by a target source without transmitting any signals of its own.
SiRF, which stands for "Silicon GPS Receiver," refers to a company that specialized in the design and manufacturing of GPS (Global Positioning System) receiver chipsets and related technologies. Founded in the late 1990s, SiRF made significant contributions to the integration of GPS functionality into mobile devices, allowing them to determine their location using satellite signals. The company developed several notable GPS chipset solutions that were widely used in consumer electronics, automotive navigation systems, and various applications requiring location-based services.
The 105th meridian west is a line of longitude that is located 105 degrees west of the Prime Meridian, which is 0 degrees longitude. This meridian runs from the North Pole to the South Pole, passing through various regions of North America. In the United States, it runs through several states, including Montana, Wyoming, Colorado, and New Mexico.
The 146th meridian east is a line of longitude that is 146 degrees east of the Prime Meridian, which is located in Greenwich, England. This meridian runs from the North Pole to the South Pole, passing through various countries and territories. In terms of geography, the 146th meridian east passes through several regions, including parts of Russia, the Pacific Ocean, and significantly, it crosses through Australia.
The 88th meridian west is a longitudinal line located 88 degrees west of the prime meridian, which is defined as 0 degrees longitude. This meridian runs north-south and passes through several U.S. states and regions.
The COVID-19 pandemic on the Diamond Princess cruise ship was a significant early outbreak of the virus, which occurred in early 2020. The ship was quarantined in Yokohama, Japan, after a former passenger tested positive for COVID-19 after disembarking in Hong Kong.
Safe Routes to School (SRTS) is a program aimed at making it safer and easier for students to walk and bike to school. The initiative seeks to encourage more children to use these active modes of transportation by addressing barriers to walking and biking, such as traffic safety, roadway design, and community awareness.
Kombiverkehr is a German company specializing in intermodal transport solutions, particularly in combining road and rail transport for freight. Founded in 1969, it plays a significant role in enhancing the efficiency of logistics by facilitating the seamless transfer of goods between different modes of transport. The company's services often include the transportation of shipping containers, trailers, and larger freight items across Europe, enabling businesses to reduce transport costs and environmental impact by leveraging the strengths of both rail and road.
The history of glass dates back thousands of years and reflects the evolution of technology, art, and culture across various civilizations. Here’s an overview of its development through time: ### Ancient Beginnings (Circa 3500 BCE) - **Mesopotamia and Egypt:** The earliest known glass artifacts date back to around 3500 BCE in Mesopotamia and Egypt. These early forms were primarily used for making small beads and ornamental objects rather than for containers or windows.
Transparent wood composite is an innovative material that combines the properties of wood and transparency, achieved through a series of processes that modify the natural structure of wood. This composite material has gained attention for its potential applications in areas such as construction, renewable energy, and optical devices. The process typically involves the following steps: 1. **Delignification**: The natural lignin present in wood, which gives it color and opacity, is removed chemically or through a series of treatments.
Werner J. A. Dahm is a prominent aerospace engineer known for his work in the fields of aerodynamics and propulsion systems. He has made significant contributions to various aspects of engineering, particularly in the study of fluid dynamics and its applications in aerospace technology. He has also been involved in academic research, holding various positions in educational institutions and contributing to advancements in engineering practices.
Walter Maxwell Gibson might not be a widely recognized figure, as there isn't extensive information about him in popular knowledge or historical references up to my last update in October 2021. It's possible that he could be known in specific fields such as literature, academia, or another area, but further context is needed to provide accurate or relevant information.
William O. Baker was a prominent American physicist and businessman, known for his contributions to the field of telecommunications and materials science. He served as the president of Bell Labs (Bell Telephone Laboratories), where he was instrumental in advancing research and development in various technological areas, including fiber optics and semiconductor technologies. Baker's work had a significant impact on both scientific research and industry practices.
The history of software engineering is a rich and evolving narrative that traces the development of methods and practices for designing, implementing, testing, and maintaining software systems. Here’s an overview of its key milestones and themes: ### 1. **Early Beginnings (1940s - 1950s)** - **1940s**: The concept of software began to surface with the development of early computers. Pioneers like Alan Turing and John von Neumann contributed foundational ideas.
The Berkeley Software Distribution (BSD) is a Unix-like operating system that was first developed and distributed by the Computer Systems Research Group (CSRG) at the University of California, Berkeley, starting in the late 1970s. The history of BSD is significant in the evolution of Unix systems and open-source software. Here are some key points in its development: ### 1.
A magnetic domain is a region within a magnetic material where the magnetic moments of atoms are aligned in a uniform direction due to interactions between them. In such domains, the magnetic moments, which arise from the spin and orbital angular momentum of electrons, point in the same direction, resulting in a net magnetic moment for that domain. In ferromagnetic materials, which include elements like iron, cobalt, and nickel, these domains can vary in size and orientation.
"Incredibles 2" is a 2018 animated superhero film produced by Pixar Animation Studios and released by Walt Disney Pictures. It is a sequel to the 2004 film "The Incredibles," both directed by Brad Bird. The story continues the adventures of the Parr family, known as the superhero family "The Incredibles," as they navigate the challenges of having superpowers in a world where superheroes are still illegal.
"Captain Sindbad" is a 1963 fantasy adventure film directed by Byron Haskin. The film stars Guy Williams as Captain Sindbad, and it features a mix of live-action and special effects typical of the era. The story follows Captain Sindbad on his journey to rescue the beautiful Princess Shireen, played by Eva St. Marie, from the clutches of an evil sorcerer named Beder.
"The Vanishing Private" is a 1942 American short comedy film produced by Warner Bros. It stars cartoon characters Private Snafu, created by the studio to educate and entertain U.S. soldiers during World War II. The film was directed by Chuck Jones and is notable for its humorous approach to military training, emphasizing the importance of discipline and following orders.
The Capillary number (Ca) is a dimensionless number that describes the relative effect of viscous forces to surface tension forces in a fluid. It is a critical parameter in fields such as fluid mechanics, petroleum engineering, and the study of multiphase flows.

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