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Topic Review
Double-Barreled Shotgun
A double-barreled shotgun is a break-action shotgun with two parallel barrels, allowing two single shots to be fired in quick succession.
  • 401
  • 06 Dec 2022
Topic Review
Double-Reheat Boiler in China
The ultra-supercritical (USC) double-reheat technology is an immediate area of research focus in China, since the thermal efficiency of USC double-reheat unit is higher than the USC single-reheat unit. The parameters and capacity of USC double-reheat unit in China have made major breakthroughs, and the thermal efficiency of the units are as high as 47–48%, which is the highest in the world. USC double-reheat boiler is one of the most important devices for USC double-reheat unit, and the design concept and precision have a vital effect on the operation of boiler and power station. The most difficult and important factors in the design of double-reheat boiler are the layout of heating surface and the steam temperature regulation method.
  • 1.2K
  • 24 Dec 2021
Topic Review
Double-Row Pile Supporting Structure
Double-row pile supporting systems are mainly used in temporary engineering as a protection measure to ensure the smooth construction of the underground section of the main part of the structures and the safety of the environment around the foundation pit. During the process of urbanization, the density of high-rise, super-high-rise, and underground buildings in cities has increased, and the utilization rate of underground space has been increasing. Influenced by the foundation of adjacent structures and the complex underground environment, the double-row pile supporting structure has attracted wide attention. Based on the existing single-row pile, and by adding a row of piles behind it, the double-row pile supporting structure evolves from this. The double-row pile structure is mainly composed of the front pile, the back pile, the crown beam, and the connecting beam.
  • 409
  • 24 Aug 2023
Topic Review
Double-sided lapping
Double-sided lapping is an ultra-precision manufacturing process used for fabricating wafers, thin substrates, metal slice parts, etc. to achieve high surface integrity, flatness and parallelism. It can be divided into double-sided lapping with loose abrasives and fixed abrasives.
  • 3.6K
  • 29 Oct 2020
Topic Review
Douglas–Grumman Scandal
The Douglas-Grumman Scandal was a bribery scandal that rocked Japan in February 1979, concerning the sale of American fighter jets.
  • 351
  • 15 Nov 2022
Topic Review
Downstream Processing of Virus Filter
Virus filtration is a single-use, size-based separation process in which the contaminating virus particles are retained while the therapeutic molecules pass through the membrane pores. Virus filtration is routinely used as part of the overall virus clearance strategy. Compromised performance of virus filters due to membrane fouling, low throughput and reduced viral clearance, is of considerable industrial significance and is frequently a major challenge.
  • 2.0K
  • 24 Apr 2022
Topic Review
DOX Delivery Systems
Doxorubicin (DOX) is one of the most widely used anthracycline anticancer drugs due to its high efficacy and evident antitumoral activity on several cancer types. However, its effective utilization is hindered by the adverse side effects associated with its administration, the detriment to the patients’ quality of life, and general toxicity to healthy fast-dividing cells. Thus, delivering DOX to the tumor site encapsulated inside nanocarrier-based systems (like liposomes, micelles, metal-organic frameworks (MOFs)) is an area of research that has garnered colossal interest in targeted medicine. Nanoparticles can be used as vehicles for the localized delivery and release of DOX, decreasing the effects on neighboring healthy cells and providing more control over the drug’s release and distribution.
  • 709
  • 24 Jan 2022
Topic Review
Drag Reduction Using Additives
Reduction of fluid resistance using the rheological characteristics of a polymer-surfactant solvent is research that contains many aspects, such as the theory of the drag reduction process, historical journey, and ongoing current research development. Many studies have been conducted, but it is challenging to know all existing and new research threads. The present investigation was conducted using literature studies regarding drag reducing agents. This research will also discuss the characteristics of flowing fluids and their effects on the velocity profile with friction factor of flowing fluids in smooth circular straight pipe geometries based on experimental, theoretical approaches. It concludes with aspects of research conducted around reducing drag using drag reducing agents, ideas about innovations, structuring overlook in testing, and modification of the fluid flow state. 
  • 538
  • 29 Sep 2021
Topic Review
Dragon 2
Dragon 2 is a class of reusable spacecraft developed and manufactured by U.S. aerospace manufacturer SpaceX, intended as the successor to the Dragon cargo spacecraft. The spacecraft launches atop a Falcon 9 Block 5 rocket and returns via ocean splashdown. When compared to Dragon, Crew Dragon has larger windows, new flight computers and avionics, redesigned solar arrays, and a modified outer mold line. The spacecraft has two planned variants – Crew Dragon, a human-rated capsule capable of carrying up to seven astronauts, and Cargo Dragon, an updated replacement for the original Dragon. Crew Dragon is equipped with an integrated launch escape system in a set of four side-mounted thruster pods with two SuperDraco engines each. Crew Dragon has been contracted to supply the International Space Station (ISS) with crew under the Commercial Crew Program, with the initial award occurring in October 2014 alongside Boeing CST-100 Starliner. Crew Dragon's first non-piloted test flight to the ISS launched in March 2019. Cargo Dragon will supply the ISS with cargo under the Commercial Resupply Services-2 (CRS-2) after a January 2016 selection alongside Northrop Grumman Innovation Systems' Cygnus and Sierra Nevada Corporation's Dream Chaser. SpaceX's first CRS-2 mission with the Cargo Dragon is slated to occur in August 2020 after SpaceX's final CRS-20 mission with the original Dragon spacecraft. The Crew Dragon capsule that flew in the first test flight was scheduled to be used in a flight abort test before it unexpectedly exploded during a test of its SuperDraco engines on 20 April 2019. An investigation into the explosion was completed on 15 July 2019 and resulted in changes to vehicle plumbing. The in-flight abort test was conducted on 19 January 2020 at 15:30 UTC. The first crewed launch is scheduled for April 2020.
  • 1.2K
  • 29 Nov 2022
Topic Review
Dragon Boat
A dragon boat is a human-powered watercraft originating from the Pearl River Delta region of China 's southern Guangdong Province. These were made of teak, but in other parts of China, different kinds of wood are used. It is one of a family of traditional paddled long boats found throughout Asia, Africa, the Pacific islands, and Puerto Rico. The sport of dragon boat racing has its roots in an ancient folk ritual of contending villagers, which dates back 2000 years throughout southern China, and even further to the original games of Olympia in Ancient Greece . Both dragon boat racing and the ancient Olympiad included aspects of religious observances and community celebrations, along with competitions. Dragon boat racing has been a traditional Chinese paddled watercraft activity for over 2000 years and began as a modern international sport in Hong Kong in 1976. These boats are typically made of carbon fiber, fiberglass, and other lightweight materials. For competition events, dragon boats are generally rigged with decorative Chinese dragon heads and tails. At other times (such as during training), decorative regalia is usually removed, although the drum often remains aboard for drummers to practice. For races, there are 18-20 people in a standard boat, and 8-10 in a small boat, not including the steersperson (helm) and the drummer. In December 2007, the central government of the People's Republic of China added the Dragon Boat Festival, along with the Qingming and Mid-Autumn festivals, to the schedule of national holidays.
  • 1.1K
  • 05 Nov 2022
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