A pulsar wind nebula (PWN) is a type of astronomical nebula formed by the wind of particles emitted from a rotating neutron star, known as a pulsar. Pulsars are highly magnetized, rotating neutron stars that emit beams of electromagnetic radiation out of their magnetic poles. As the pulsar rotates, these beams sweep across space, and when they are pointed towards Earth, they are detected as pulses of radiation, hence the name "pulsar.
The EcoDemonstrator program is an initiative launched by Boeing to accelerate the development and implementation of innovative technologies aimed at reducing the environmental impact of aviation. Through this program, Boeing collaborates with various partners, including airlines, research institutions, and governments, to test new technologies in real-world conditions. The EcoDemonstrator program typically involves the modification of existing aircraft, which serves as a testbed for novel technologies related to fuel efficiency, noise reduction, and emissions control.
Loud music refers to sound that is produced at a high volume, often characterized by a strong intensity and amplitude. It can encompass various genres, including rock, pop, electronic dance music (EDM), and hip-hop, among others. Loud music is commonly played in venues such as concerts, clubs, and festivals, where the auditory experience is often amplified to create an energetic atmosphere.
"One Square Inch of Silence" is a project and concept initiated by Gordon Hempton, an acoustic ecologist and sound recordist, aimed at preserving and valuing natural soundscapes. The project advocates for the protection of a specific area in the Hoh Rain Forest in Washington State, where Hempton identified a location that has minimal human-made noise, creating an environment of profound natural silence.
George Constantinescu was a Romanian engineer and inventor known for his contributions to mechanics and the development of various technologies. Born on January 15, 1881, in Romania, he later moved to England, where he conducted much of his work. One of his notable contributions was the development of the "sonic" principles in various applications, particularly in the field of mechanics and engineering.
As of my last update in October 2023, John F. Brady is known as a chemical engineer and academic. He is notably recognized for his contributions to the field of chemical engineering education and research. He has co-authored textbooks and research papers, particularly in the areas of transport phenomena and chemical process design. One of his well-known textbooks is "Transport Processes and Separation Process Principles," which is widely used in chemical engineering courses.
A meniscus is the curve seen at the surface of a liquid in response to its container. This phenomenon occurs because of surface tension and adhesive forces between the liquid and the container material. The shape of the meniscus can vary depending on the type of liquid and the surface it is in contact with.
The term "shell balance" can refer to different concepts depending on the context. However, it is most commonly associated with financial and accounting contexts, specifically in relation to the "shell company" concept or financial reporting procedures. 1. **Shell Company**: A shell company is a business entity that has no significant assets or operations. Companies might use shell balances to refer to the financial positioning of such companies, which often only hold minimal cash or investments.
SAMCEF (Simulation Assistance for Mechanical CAD Engineering and Formulation) is a software suite developed by the French company SAMTECH, which specializes in finite element analysis (FEA) and computer-aided engineering (CAE). SAMCEF is used for structural, thermal, and fluid dynamics simulations. It is widely employed in various industries, including aerospace, automotive, and manufacturing, for tasks such as product design, optimization, and performance evaluation.
Polyurethane foam is a type of synthetic foam made from the polymerization of urethane, which is created from the reaction of polyols and isocyanates. It is a versatile material that is widely used in various applications due to its flexibility, durability, and insulating properties.
A cubosome is a type of nanostructured material formed from self-assembling lipid structures. These nanoparticles are typically composed of lipids that spontaneously organize into a cubic phase, creating a three-dimensional arrangement with a unique internal architecture. The cubic phase structure allows for a high internal surface area and can encapsulate various substances, such as drugs, proteins, or other bioactive compounds, making cubosomes a subject of interest in drug delivery and pharmaceutical applications.
Guest Host Displays can refer to a system used in various contexts, especially in virtual environments, presentations, or events where one party (the guest) presents information or content while another party (the host) facilitates or manages the display.
The term "liquid-ordered phase" (Lo) is typically used in the context of lipid bilayers, which are fundamental components of biological membranes. The concept arises from the study of lipid behavior in membranes and their phase transitions. In lipid bilayers, different phases can coexist depending on factors such as temperature, composition, and environmental conditions.
Thermotropic crystals are a type of liquid crystal that exhibit changes in their optical properties in response to variations in temperature. These materials can transition between different phases, such as liquid crystal, isotropic liquid, and crystalline solid states, depending on the temperature conditions. In thermotropic liquid crystals, the molecular arrangement changes with temperature, leading to different phases with distinct optical characteristics, such as birefringence.
Solid film lubricants are materials applied as a thin layer to reduce friction between surfaces in relative motion while providing a barrier to wear and corrosion. Unlike traditional lubricants, such as oils or greases, solid film lubricants remain effective under a wide range of temperatures and pressures and do not require reapplication during service. They are especially useful in extreme environments, such as high temperatures, vacuum conditions, or where liquid lubricants would be ineffective.
Neutron instrumentation refers to the tools and techniques used to detect and analyze neutrons for various scientific, industrial, and medical applications. Neutrons are uncharged particles found in the nucleus of atoms, and they play a critical role in many areas of research, especially in materials science, physics, chemistry, and biology.
Δ¹³C (delta carbon-13) is a measure used in the field of stable isotope geochemistry to express the ratio of carbon isotopes, specifically the stable isotopes carbon-12 (¹²C) and carbon-13 (¹³C). The delta notation is used to give the relative difference in the isotopic composition of a sample compared to a standard reference material.
Jorge E. Hirsch is an Argentine-American physicist known for his work in condensed matter physics and his development of the Hirsch index, a metric used to measure the productivity and citation impact of a researcher’s publications. The Hirsch index (h-index) combines both the number of publications and the number of citations to provide a single number that reflects the scientific output of a researcher. It has become a widely used tool in academia to assess research performance.
Edgar Odell Lovett (1855–1933) was an American mathematician and educator, best known for his role as the first president of Rice University in Houston, Texas. He served as president from 1912 until 1946 and was pivotal in shaping the institution's early development and academic reputation. Lovett was notable for his efforts to establish Rice as a prominent research university and for promoting a strong emphasis on science and engineering education.
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





