Supercomputing in China has evolved to become one of the most advanced and influential sectors in the global computing landscape. The country has made significant investments in supercomputing technology, infrastructure, and talent development. Here are some key aspects of supercomputing in China: 1. **Leading Supercomputers**: China has been home to several of the world's fastest supercomputers.

A "weather rock" is a humorous and simple tool often used to indicate weather conditions. It is essentially a rock that is accompanied by a set of guidelines or a legend that explains how to interpret the weather based on the condition of the rock. For example: - If the rock is wet, it's raining. - If the rock is white, it's snowing. - If the rock is moving, it's windy. - If the rock is hard to see, it's foggy.

Prelog strain refers to a type of strain observed in certain polymers that exhibit a characteristic behavior under stress. Particularly, it is defined in the context of the mechanical properties of polymers, where it is related to their ability to deform elastically or plastically. The term is often used in relation to the study of polymer mechanics and the response of materials to external forces.

A tube socket is an electrical component designed to hold vacuum tubes (also known as electron tubes or thermionic valves) in place within a circuit. These sockets provide a secure and reliable connection between the tube's pins and the circuit board or chassis. Tube sockets come in various configurations to accommodate different types of vacuum tubes. They typically feature multiple holes or sockets for the tube's pins, allowing for easy insertion and removal of the tube without soldering or desoldering.

A two-dimensional gas refers to a theoretical model in which gas particles are confined to move in two dimensions, effectively creating a system where all motion occurs on a flat surface (like a plane) rather than in three-dimensional space. This model is often used in statistical mechanics and condensed matter physics to explore and understand the properties of systems that can be approximated as having only two degrees of freedom in spatial motion.

Ursula Gather is a prominent figure in the field of mathematics, particularly known for her work in algebraic geometry and commutative algebra. She has made significant contributions to the understanding of various mathematical concepts and has been involved in academic research and education.

Ultrasonic hearing refers to the ability to perceive sounds at frequencies higher than the upper limit of human hearing, which is typically around 20 kHz (20,000 Hz). While most humans cannot hear sounds above this frequency, some animals, such as bats, dogs, and certain species of rodents, have the capability to detect ultrasonic sounds. These higher-frequency sounds are often used in various animal communication, echolocation, and hunting strategies.

An "undefined variable" typically refers to a variable in programming that has been declared but not initialized with a value or has not been declared at all in the current scope. When you try to access or manipulate an undefined variable, it can lead to errors or unexpected behavior in your code. Here's a breakdown of the concept: 1. **Declaration vs.

An undercompressive shock wave is a type of wave phenomenon that occurs in certain fluid dynamics and gas dynamics contexts. In contrast to traditional shock waves, which are characterized by an increase in pressure, density, and temperature across a discontinuity, undercompressive shock waves exhibit a decrease in pressure and density.

The unit of electrical potential is the volt (symbol: V). The volt is defined as the potential difference between two points in an electric circuit when one joule of energy is used to move one coulomb of electric charge between those two points.

Valery Troitskaya does not appear to be a widely recognized figure, term, or concept in common knowledge or popular culture as of my last update in October 2023. It is possible that you may be referring to a specific person who is not widely known or perhaps a fictional character, concept, or local figure.

An Earth inductor compass is a type of navigational instrument that uses the Earth's magnetic field to determine direction. It is based on the principles of electromagnetic induction and is commonly used in aviation and marine navigation. ### Key Features and Functionality: 1. **Principle of Operation**: The Earth inductor compass operates under Faraday's law of electromagnetic induction. It consists of a coil of wire that is rotated in the Earth's magnetic field.

Bowditch's American Practical Navigator is a comprehensive guidebook for maritime navigation, first published in 1802 by Nathaniel Bowditch. It serves as an essential reference for sailors, navigation students, and maritime professionals, providing a wealth of information on navigation, piloting, and related topics. The book covers various subjects essential for navigation, such as: 1. **Celestial Navigation**: Techniques for using celestial bodies (like the sun and stars) to determine a ship's position at sea.

Circumnavigation refers to the act of traveling all the way around an entire object, typically the Earth, by following a path that encircles it. This can be achieved by various means of transportation, such as sailing, flying, or driving. In historical contexts, circumnavigation is often associated with famous explorations, such as Ferdinand Magellan's expedition in the early 16th century, which was the first known voyage to successfully navigate around the globe.

A logbook in a nautical context is a formal record maintained by the captain or crew of a vessel that documents various aspects of the ship's journey and operations. The logbook serves several important purposes, including: 1. **Navigation Records**: It includes details about the ship's course, speed, position (latitude and longitude), and navigational events such as changes in course or significant waypoints.

NAVAREA, short for "Navigation Areas," refers to maritime regions established for the purpose of disseminating navigational warning information and ensuring safe navigation. These areas are part of a global system used to provide mariners with vital information regarding hazards, changes in navigation aids, and other pertinent navigational details. The world is divided into specific NAVAREA regions, each managed by a designated country or organization responsible for issuing navigational warnings and information to vessels operating within that area.

Roteiro, in the context of navigation, refers to a detailed plan or route outline that guides the passage of a vessel from one point to another. It includes information such as waypoints, distances, estimated times of arrival, navigational aids, and any potential hazards or landmarks. This document serves as a crucial tool for mariners to ensure safe and efficient navigation over bodies of water, whether it be for recreational boating, commercial shipping, or fishing activities.

The Sagres School, known in Portuguese as "Escola de Sagres," was an important educational institution and center for maritime exploration founded in the 15th century in Portugal. It is often associated with Prince Henry the Navigator (Infante Dom Henrique), who played a key role in the early days of the Portuguese Age of Discovery. Located near the coastal town of Sagres in the Algarve, the school did not have formal classrooms in the modern sense.

In navigation, particularly in the context of spacecraft and aircraft, a **state vector** is a mathematical representation that encompasses the position and velocity of an object in space at a specific point in time. The state vector provides all the necessary information for determining the future motion of the object under the influence of forces acting upon it.

The United States Coast Pilot is a series of publications that provide detailed navigation information for U.S. coastal waters, including harbors, rivers, and other inland waterways.