Subject:
All Disciplines Arts & Humanities Biology & Life Sciences Business & Economics Chemistry & Materials Science Computer Science & Mathematics Engineering Environmental & Earth Sciences Medicine & Pharmacology Physical Sciences Public Health & Healthcare Social Sciences
Sort:
Hottest Latest Alphabetical (A-Z) Alphabetical (Z-A)
Type:
All Topic Review Biography
Topic Review
Ballasted Track
Ballasted track has the phenomenon of local instabilities, which are usually related to the intensive sleeper void development that requires enormous maintenance costs and influences track reliability, availability and safety. The appearance of the void zones is unavoidable in such structures as transition zones, turnouts and rail joints. 
  • 1.2K
  • 19 Jul 2021
Topic Review
Ballistic Missile
A ballistic missile follows a ballistic trajectory to deliver one or more warheads on a predetermined target. These weapons are only guided during relatively brief periods of flight—most of their trajectory is unpowered, being governed by gravity and air resistance if in the atmosphere. Shorter range ballistic missiles stay within the Earth's atmosphere, while longer-ranged intercontinental ballistic missiles (ICBMs), are launched on a sub-orbital flight trajectory and spend most of their flight out of the atmosphere. These weapons are in a distinct category from cruise missiles, which are aerodynamically guided in powered flight.
  • 7.2K
  • 05 Nov 2022
Topic Review
Balloon (Aeronautics)
In aeronautics, a balloon is an unpowered aerostat, which remains aloft or floats due to its buoyancy. A balloon may be free, moving with the wind, or tethered to a fixed point. It is distinct from an airship, which is a powered aerostat that can propel itself through the air in a controlled manner. Many balloons have a basket, gondola, or capsule suspended beneath the main envelope for carrying people or equipment (including cameras and telescopes, and flight-control mechanisms).
  • 984
  • 27 Oct 2022
Topic Review
Balloon Satellite
A balloon satellite (also occasionally referred to as a "satelloon", which is a trademarked name owned by Gilmore Schjeldahl's G.T. Schjeldahl Company) is a satellite that is inflated with gas after it has been put into orbit.
  • 1.1K
  • 17 Oct 2022
Topic Review
Baobab (Adansonia digitata L.)
Baobab (Adansonia digitata L.), which belongs to the Malvaceae family, is an indigenous African tree widespread in arid savannah regions of Madagascar, mainland Africa, the Arabian peninsula, and Australia, and it was once classified as the “lost crop” of Africa. 
  • 879
  • 18 Oct 2021
Biography
Barbara Oakley
Barbara Ann Oakley (née Grim, November 24, 1955) is a Professor of Engineering at Oakland University. She is involved in multiple areas of research, ranging from STEM education, to engineering education, to learning practices. Most recently, Oakley has co-created and taught Learning How To Learn: Powerful mental tools to help you master tough subjects, the world's most popular online course.[1
  • 495
  • 05 Dec 2022
Biography
Barnes Wallis
Sir Barnes Neville Wallis CBE FRS RDI FRAeS[1] (26 September 1887 – 30 October 1979), was an English scientist, engineer and inventor. He is best known for inventing the bouncing bomb used by the Royal Air Force in Operation Chastise (the "Dambusters" raid) to attack the dams of the Ruhr Valley during World War II. The raid was the subject of the 1955 film The Dam Busters, in which Wallis wa
  • 674
  • 06 Dec 2022
Biography
Barney Roos
Delmar Gerle "Barney" Roos (11 October 1888 – 13 February 1960) was an United States automotive engineer who served as Studebaker's head of engineering from 1926[1] to 1936,[2] specialising in straight-eight engines. He later worked for the British Rootes Group in the design of Humber, Hillman and Sunbeam Talbot cars. Before World War II, he returned to the United States, where he co-designed
  • 443
  • 08 Dec 2022
Topic Review
Barrier-Free Wheelchair and Mechanical Transmission
Wheelchairs are widely used around the world to provide mobility to the elderly and disabled [1]. However, the difficulty to access areas with curbs and stairs using a standard electric-powered wheelchair limits the scope of activities, thereby declining the quality of life of those who depend on electric-powered wheelchairs. Although slopes and elevators are being introduced to promote barrier-free locomotion, it is difficult to implement them in all public facilities. Therefore, climbing up and down the stairs is inevitably a critical issue with respect to user safety. With the increasing interest in the aging population and health welfare around the world, various studies on indoor electric wheelchairs for the elderly and disabled are being conducted.
  • 668
  • 23 Jun 2021
Topic Review
Barriers and Enables in Demand Response Performance Chain
The role of demand response increases considerably with a higher share of renewable energy sources in the energy mix, characterized with more frequent energy market price fluctuations due to mismatch between uncontrollable weather-dependent production and currently relatively inflexible energy consumption. Reallocation of energy consumption from high-price hours to lower price hours helps to avoid extra costs to the entire economy and ensures the possibility to minimize fossil-based energy generation, therefore contributing to the achievement of zero-emission goals.
  • 280
  • 19 Oct 2023
  • Page
  • of
  • 678
Featured Entry Collections
>>

Featured Books

>>
Encyclopedia of Social Sciences
Encyclopedia of COVID-19
Encyclopedia of Fungi
Encyclopedia of Digital Society, Industry 5.0 and Smart City
Video Production Service
Feedback