Robotics
Many insects and spiders get their uncanny ability to scurry up walls and walk upside down on ceilings with the help of specialized sticky footpads that allow them to adhere to surfaces in places where no human would dare ...
Jul 2, 2021
0
220
Engineering
Microwave engineers, infectious disease specialists and polymer scientists from the University of Edinburgh, Heriot-Watt University and the University of Strathclyde have teamed up to create a novel microwave sterilization ...
Aug 5, 2021
0
538
Engineering
A new type of lightweight, 3D-printed heat exchanger with a maze-like design is more compact and efficient than its conventional counterparts, its developers say.
Apr 5, 2022
1
309
Energy & Green Tech
In a new Nature Energy study, engineers report progress toward lithium-metal batteries that charge quickly—as fast as an hour. This fast charging is thanks to lithium metal crystals that can be seeded and grown—quickly ...
Feb 9, 2023
0
1703
Computer Sciences
Ultrasonic waves don't make a sound, but they can still activate Siri on your cellphone and have it make calls, take images or read the contents of a text to a stranger. All without the phone owner's knowledge.
Feb 27, 2020
2
259
Energy & Green Tech
The search for renewable energy sources, which include wind, solar, hydroelectric dams, geothermal, and biomass, has preoccupied scientists and policymakers alike, due to their enormous potential in the fight against climate ...
Jun 9, 2020
11
412
Engineering
Organic semiconductor materials are promising key technologies for the development of state-of-the-art optoelectronic components and are used in photovoltaics as well as in sensor technology and microelectronics. In order ...
Oct 19, 2023
0
59
Engineering
Frustrated with spotty WiFi connection? Engineers at the University of California San Diego have developed a "smart surface" that could make signal available in dead spots—and also make the existing connection twice as ...
Apr 3, 2020
0
276
Engineering
(Tech Xplore)—Scientific research into stuff—what things are made of, what they could be made of, what everyday applications could expand into groundbreaking applications with everyday materials—is very much alive and ...
Software
Beneath the surface web, the public form of the internet you use daily to check email or read news articles, exists a concealed "dark web." Host to anonymous, password-protected sites, the dark web is where criminal marketplaces ...
May 14, 2019
0
76
In mathematics, specifically in topology, a surface is a two-dimensional topological manifold. The most familiar examples are those that arise as the boundaries of solid objects in ordinary three-dimensional Euclidean space R3 — for example, the surface of a ball or bagel. On the other hand, there are surfaces which cannot be embedded in three-dimensional Euclidean space without introducing singularities or intersecting itself — these are the unorientable surfaces.
To say that a surface is "two-dimensional" means that, about each point, there is a coordinate patch on which a two-dimensional coordinate system is defined. For example, the surface of the Earth is (ideally) a two-dimensional sphere, and latitude and longitude provide coordinates on it — except at the International Date Line and the poles, where longitude is undefined. This example illustrates that not all surfaces admits a single coordinate patch. In general, multiple coordinate patches are needed to cover a surface.
Surfaces find application in physics, engineering, computer graphics, and many other disciplines, primarily when they represent the surfaces of physical objects. For example, in analyzing the aerodynamic properties of an airplane, the central consideration is the flow of air along its surface.
This text uses material from Wikipedia, licensed under CC BY-SA
