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Topic Review
Earth Shelter
An earth shelter, also called an earth house, earth bermed house, or underground house, is a structure (usually a house) with earth (soil) against the walls, on the roof, or that is entirely buried underground. Earth acts as thermal mass, making it easier to maintain a steady indoor air temperature and therefore reduces energy costs for heating or cooling. Earth sheltering became relatively popular after the mid-1970s, especially among environmentalists. However, the practice has been around for nearly as long as humans have been constructing their own shelters.
  • 2.1K
  • 18 Oct 2022
Topic Review
Crowdsourcing Update Methods for High-Definition Maps
High-definition (HD) maps serve as crucial infrastructure for autonomous driving technology, facilitating vehicles in positioning, environmental perception, and motion planning without being affected by weather changes or sensor-visibility limitations.
  • 2.1K
  • 01 Apr 2024
Topic Review
BMW M Coupe
The BMW M Coupe is a shooting-brake styled high-performance automobile produced by BMW. Only two generations of the M Coupe have been manufactured, the original E36/8 Z3 Coupe and the second generation E86 Z4 Coupe.
  • 2.1K
  • 22 Nov 2022
Topic Review
Nauka (ISS Module)
Nauka (Russian: Нау́ка; lit. Science), also known as the Multipurpose Laboratory Module (MLM), (Russian: Многофункциональный лабораторный модуль, or МЛМ), is a component of the International Space Station (ISS) which has not yet been launched into space. The MLM is funded by the Roscosmos. In the original ISS plans, Nauka was to use the location of the Docking and Stowage Module. Later, the DSM was replaced by the Rassvet module and it was moved to Zarya's nadir port. Planners anticipate Nauka will dock at Zvezda's nadir port, replacing Pirs. The launch of Nauka, initially planned for 2007, has been repeatedly delayed for various reasons. In May 2020, Nauka was reported to be planned for launch in the second quarter of 2021, after which the warranties of some of Nauka's systems will expire. As of 4 February 2021, Nauka is planned for launch on 15 July 2021.
  • 2.1K
  • 26 Oct 2022
Topic Review
List of Aircraft of World War II
The list of aircraft of World War II includes all the aircraft used by those countries which were at war during World War II from the period between their joining the conflict and the conflict ending for them. Aircraft developed but not used operationally in the war are in the prototypes section at the end. Prototypes for aircraft that entered service under a different design number are ignored in favour of the service version. The date the aircraft entered service, or was first flown if the service date is unknown or it did not enter service follows the name, followed by the country of origin and major wartime users. Aircraft used for multiple roles are generally only listed under their primary role unless specialized versions were built for other roles in significant numbers. Aircraft used by neutral countries such as Spain , Switzerland and Sweden (or countries which did no significant fighting such as most of those in South America) are not included.
  • 2.0K
  • 08 Nov 2022
Topic Review
Impact of Battery Degradation on Energy Management Systems
The increasing popularity of electric vehicles (EVs) has been attributed to their low-carbon and environmentally friendly attributes. Given the depletion of fossil fuels and changes in climatic conditions due to air pollution, extensive research has been undertaken to develop EVs capable of matching or exceeding the performance of today’s internal combustion engines (ICEs). Transitioning from ICE vehicles to EVs can significantly reduce greenhouse gases over a vehicle’s lifetime. Across the different EV types, the widespread usage of batteries is due to their high power density and steady output voltage, making them excellent energy storage devices (ESD). The current downsides of battery-powered electric vehicles include long recharge times, the impact of additional strain on the grid, poor societal acceptance due to high initial costs, and a lack of adequate charging infrastructure. Even more problematic is their short driving range compared to standard ICE and fuel cell EVs. This situation is further compounded through battery degradation, which gradually reduces the capacity of a battery.
  • 2.0K
  • 20 Sep 2022
Topic Review
Lockheed YO-3
The Lockheed YO-3 "Quiet Star" was an United States single-engined, propeller-driven aircraft that was developed for battlefield observation during the Vietnam War. It was designed to be as quiet as possible, and was intended to observe troop movements in near-silence during the hours of darkness.
  • 2.0K
  • 21 Nov 2022
Topic Review
Fiat G.50
The Fiat G.50 Freccia ("Arrow") was a World War II Italian fighter aircraft developed and manufactured by aviation company Fiat. Upon entering service, the type became Italy’s first single-seat, all-metal monoplane that had an enclosed cockpit and retractable undercarriage. On 26 February 1937, the G.50 conducted its maiden flight. During early 1938, the Freccias served in the Regia Aeronautica (the Italian Air Force) and with its expeditionary arm, the Aviazione Legionaria, in Spain, where they proved to be relatively fast and very manoeuvrable in comparison to its adversaries in the theatre. Early in the Second World War, it was determined that the G.50 possessed inadequate armament, comprising a pair of Breda-SAFAT 12.7-mm machine guns. The fighter was extensively used on various fronts by Italy, including in Northern Europe, North Africa, the Balkans, and the Italian mainland. The G.50 commonly came up against the British Hawker Hurricane, which was fast enough to frequently outrun and out-range the Italian opponent. Later models of the fighter had improvements, including a substantial increase in range. The G.50 was exported to several overseas customers, small numbers being flown by the Air Force of the Independent State of Croatia while 35 G.50 fighters were shipped to Finland , where they served with distinction during both the Winter War of 1940 and the Continuation War of 1941–1944 against the Soviet Union. In Finnish service, the type reportedly achieved an unprecedented kill/loss ratio of 33/1.
  • 2.0K
  • 08 Nov 2022
Topic Review
Suspension (Motorcycle)
A motorcycle's suspension serves a dual purpose: contributing to the vehicle's handling and braking, and providing safety and comfort by keeping the vehicle's passengers comfortably isolated from road noise, bumps and vibrations. The typical motorcycle has a pair of fork tubes for the front suspension, and a swingarm with one or two shock absorbers for the rear suspension.
  • 2.0K
  • 11 Nov 2022
Topic Review
Project 75I-class Submarine
The Project 75 (India)-class submarines, or P-75I, for short, are a planned class of diesel-electric submarines, which are to be built for the Indian Navy. The P-75I class is a follow-on of the P-75 class submarines of the Indian Navy. Under this project, the Indian Navy intends to acquire six conventional, diesel-electric attack submarines, which will also feature advanced capabilities - including air-independent propulsion (AIP), ISR, special operations forces (SOF), anti-ship warfare (AShW), anti-submarine warfare (ASW), anti-surface warfare (ASuW), land-attack capabilities and other features. All six submarines are expected to be constructed in India, under the Make in India initiative.
  • 2.0K
  • 13 Oct 2022
Topic Review
Mediterranean U-boat Campaign (World War II)
The Mediterranean U-boat Campaign lasted from about 21 September 1941 to 19 September 1944 during the Second World War. Malta was an active British base strategically located near supply routes from Europe to North Africa. Axis supply convoys across the Mediterranean Sea suffered severe losses, which in turn threatened the fighting ability of the Axis armies in North Africa. The Allies were able to keep their North African armies supplied. The Kriegsmarine tried to isolate Malta but later it concentrated its U-boat operations on disrupting Allied landing operations in southern Europe.[clarification needed] Some 60 German U-boats made the hazardous passage into the Mediterranean Sea from 1941. Only one completed the journey both ways. Karl Dönitz, the Commander-in-Chief, U-boats, Befehlshaber der Unterseeboote (BdU) was always reluctant to send his boats into the Mittelmeer but he recognised that natural bottlenecks such as the Straits of Gibraltar were more likely to result in shipping being found and attacked than relying on finding it in the vast Atlantic Ocean. The U-boats were sent to assist the Italians, although many were attacked in the Strait of Gibraltar and nine were sunk while attempting the passage and ten more were damaged. The Mediterranean is a clear and calm body of water which made escape more difficult for the U-boats. The Axis failed in their objective.
  • 2.0K
  • 08 Nov 2022
Topic Review
Suspension (Vehicle)
Suspension is the system of tires, tire air, springs, shock absorbers and linkages that connects a vehicle to its wheels and allows relative motion between the two. Suspension systems must support both roadholding/handling and ride quality, which are at odds with each other. The tuning of suspensions involves finding the right compromise. It is important for the suspension to keep the road wheel in contact with the road surface as much as possible, because all the road or ground forces acting on the vehicle do so through the contact patches of the tires. The suspension also protects the vehicle itself and any cargo or luggage from damage and wear. The design of front and rear suspension of a car may be different.
  • 2.0K
  • 04 Nov 2022
Topic Review
Dornier Do J
The Dornier Do J Wal ("whale") is a twin-engine German flying boat of the 1920s designed by Dornier Flugzeugwerke. The Do J was designated the Do 16 by the Reich Air Ministry (RLM) under its aircraft designation system of 1933.
  • 2.0K
  • 11 Oct 2022
Topic Review
Kar-go
Kar-go, is an autonomous delivery vehicle, designed and built by British company, Academy of Robotics Ltd, a UK company, registered in Wales. The vehicle uses self-drive / driverless car technology to drive itself to locations where it delivers packages autonomously.
  • 2.0K
  • 18 Oct 2022
Topic Review
History of Human-Powered Aircraft
HPAs are aircraft belonging to the class of vehicles known as human-powered vehicles. Early attempts at human-powered flight were unsuccessful because of the difficulty of achieving the high power-to-weight ratio. Prototypes often used ornithopter principles which were not only too heavy to meet this requirement but aerodynamically unsatisfactory. Human-powered aircraft have been successfully flown over considerable distances. However, they are still primarily constructed as engineering challenges rather than for any kind of recreational or utilitarian purpose.
  • 2.0K
  • 31 Oct 2022
Topic Review
SA-15 (Ship)
SA-15 is the project name for a series of icebreaking multipurpose cargo ships built in Finland for the Soviet Union in the 1980s. The ships, capable of independent operation in all prevailing arctic ice conditions, were the first merchant vessels designed for year-round operations in the Northern Sea Route. For this purpose they have hulls that resemble those of polar icebreakers and propulsion systems capable of withstanding ice loads. While the ships are also known as the Norilsk class after the first ship, Norilsk, they are usually referred to by their project name which denotes a subarctic 15,000 DWT cargo ship. Nineteen SA-15 class ships were delivered by Finnish shipbuilders Wärtsilä and Valmet in 1982–1987, and (As of 2020) two vessels remain in service.
  • 2.0K
  • 25 Nov 2022
Topic Review
Carbon Intensity of Passenger Transport Modes
The transport sector is responsible for a significant amount of global carbon emissions, and several policies are being implemented at different levels to reduce its impact. To properly assess the effectiveness of planned measures, analysts often rely on average emission factors for different transport modes.
  • 2.0K
  • 09 Sep 2022
Topic Review
List of Pilot Boats
This list of pilot boats is a list of notable pilot boats for New York, New Jersey, and Boston, Massachusetts. Pilot boats with the same ship numbers are organized by date and location.
  • 1.9K
  • 15 Nov 2022
Topic Review
Harbour Defence Motor Launch
The harbour defence motor launch (HDML) was a 72 ft (22 m) long British-designed motor vessel used for harbour defence during World War II. Nearly 500 were built by numerous Allied countries during the war. The HDML was designed by W J Holt at the Admiralty in early 1939. During the war HDMLs were constructed, mainly by yacht builders, in the United Kingdom and a number of other allied countries. In view of their later expanded combat roles in some Commonwealth navies some HDMLs were re-designated as "seaward defence motor launches" (SDML) or "seaward defence boats" (SDB).
  • 1.9K
  • 31 Oct 2022
Topic Review
Pilar (Boat)
Ernest Hemingway owned a 38-foot (12 m) fishing boat named Pilar. It was acquired in April 1934 from Wheeler Shipbuilding in Brooklyn, New York, for $7,495. "Pilar" was a nickname for Hemingway's second wife, Pauline, and also the name of the woman leader of the partisan band in his 1940 novel of the Spanish Civil War, For Whom the Bell Tolls. Hemingway regularly fished off the boat in the waters of Key West, Florida, Marquesas Keys, and the Gulf Stream off the Cuban coast. He made three trips with the boat to the Bimini islands wherein his fishing, drinking, and fighting exploits drew much attention and remain part of the history of the islands. In addition to fishing trips on Pilar, Hemingway contributed to scientific research which included collaboration with the Smithsonian Institution. Several of Hemingway's books were influenced by time spent on the boat, most notably, The Old Man and the Sea (1953) and Islands in the Stream (1970). The yacht also inspired the name of Playa Pilar (Pilar Beach) on Cayo Guillermo. A smaller replica of the boat is depicted in the opening and other scenes in the 2012 film Hemingway & Gellhorn.
  • 1.9K
  • 15 Nov 2022
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