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Topic Review
Reusable Launch System
A reusable launch system is a launch system that allows for the reuse of some or all of the component stages. To date, several fully reusable suborbital systems and partially reusable orbital systems have been flown. The first reusable spacecraft to reach orbit was the Space Shuttle (in 1981), which failed to accomplish the intended goal of reducing launch costs to below those of expendable launch systems. During the 21st century, commercial interest in reusable launch systems has grown considerably, with several active launchers. SpaceX CEO Elon Musk has said that if one can figure out how to reuse rockets like airplanes then the cost of access to space will be reduced by as much as a factor of a hundred. SpaceX's Falcon 9 rocket has a reusable first stage and capsule (for Dragon flights) with an expendable second stage. SpaceX has been developing a reusable second stage since the late 2010s which, if successful, could make possible the first fully-reusable orbital launch vehicle during the 2020s. Virgin Galactic has flown reusable suborbital spaceplanes, and the suborbital Blue Origin New Shepard rocket has a recoverable boost stage and passenger capsule.
  • 2.8K
  • 12 Dec 2022
Topic Review
Technology in Esports
The esports industry is growing rapidly and has captured gamers' attention. Technology is essential in esports because all esports games are video games. Prior experience has been considered a significant moderator in research on technology use .
  • 2.8K
  • 26 Jul 2021
Topic Review
Liquid versus Solid Consumption
Sharing economy is nowadays a particularly important facet of modern society. It is driven by digitalization that allows firms to interact with their customers on a daily basis by the need of reducing the environmental impact of both companies and individual actions and by the growing consciousness for environment that consumers are developing day by day. New models of consumption, such as the liquid one, are becoming very frequent, shaping countries’ productive systems and consumers’ habits.
  • 2.8K
  • 23 Dec 2021
Topic Review
Holomovement
The holomovement brings together the holistic principle of "undivided wholeness" with the idea that everything is in a state of process or becoming (David Bohm calls it the "universal flux"). In this interpretation of physics wholeness is not considered static, but as a dynamic interconnected process. The concept is presented most fully in Wholeness and the Implicate Order, published in 1980.
  • 2.8K
  • 06 Oct 2022
Topic Review
HBase Storage Architecture
HBase is the top option for storing huge data. HBase has been selected for several purposes, including its scalability, efficiency, strong consistency support, and the capacity to support a broad range of data models.
  • 2.8K
  • 21 Feb 2021
Topic Review
Hydrogen Evolution Reaction
In recent years, heteroatom doping has been found to be an effective strategy to improve the electrocatalytic hydrogen evolution reaction (HER) performances of nickel-based catalysts in acidic, neutral, and alkaline media. 
  • 2.8K
  • 26 Oct 2020
Topic Review
Tudor Rose
The Tudor rose (sometimes called the Union rose) is the traditional floral heraldic emblem of England and takes its name and origins from the House of Tudor, which united the House of Lancaster and the House of York. The Tudor rose consists of five white inner petals, representing the House of York, and five red outer petals to represent the House of Lancaster.
  • 2.8K
  • 16 Nov 2022
Topic Review
Types of Insulation Materials
Insulation materials are classified into three main categories depending on material composition, material technology, and material sustainability index.
  • 2.7K
  • 11 Jan 2023
Topic Review
Platycodon grandiflorus
Platycodon grandiflorus is a widely used edible, traditional Chinese medicinal herb. It is rich in saponins, flavonoids, phenolic acids, and other compounds. It contains a large number of fatty acids such as linoleic acid (up to 63.24%), a variety of amino acids, vitamins, and multiple essential trace elements.  In this entry, the active chemical components and the health benefits of P. grandiflorus have been reviewed, providing new ideas for the further development of nutraceutical products to prevent and manage chronic diseases.
  • 2.7K
  • 27 Oct 2020
Topic Review
Hydro Generation Scheduling
The optimal generation scheduling (OGS) of hydropower units holds an important position in electric power systems, which is significantly investigated as a research issue. Hydropower has a slight social and ecological effect when compared with other types of sustainable power source. The target of long-, mid-, and short-term hydro scheduling (LMSTHS) is to optimize the power generation schedule of the accessible hydropower units, which generate maximum energy by utilizing the available potential during a specific period. Numerous traditional optimization procedures are first presented for making a solution to the LMSTHS problem. Lately, various optimization approaches, which have been assigned as a procedure based on experiences, have been executed to get the optimal solution of the generation scheduling of hydro systems. This article offers a complete survey of the implementation of various methods to get the OGS of hydro systems by examining the executed methods from various perspectives. Optimal solutions obtained by a collection of meta-heuristic optimization methods for various experience cases are established, and the presented methods are compared according to the case study, limitation of parameters, optimization techniques, and consideration of the main goal. Previous studies are mostly focused on hydro scheduling that is based on a reservoir of hydropower plants. Future study aspects are also considered, which are presented as the key issue surrounding the LMSTHS problem.
  • 2.7K
  • 25 Jan 2022
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