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Topic Review
Flying Disc Techniques
Flying discs (including Frisbees) can be thrown in many ways. Each throw involves snapping the wrist as well as flicking the arm to impart gyroscopic stability to the disc and accelerate its mass to a certain velocity. Without spin, a disc will wobble and fall; without velocity, the disc will not go anywhere. Using these two guidelines, any number of throws are possible. Most discs are designed to create lift when thrown with the flat side up.
  • 1.1K
  • 22 Nov 2022
Topic Review
FMECA Applied to Cyber-Power Grids
Failure modes, effects, and criticality analysis (FMECA) is a qualitative risk analysis method widely used in various industrial and service applications. Despite its popularity, the method suffers from several shortcomings analyzed in the literature over the years. The classical approach to obtain the failure modes’ risk level does not consider any relative importance between the risk factors and may not necessarily represent the real risk perception of the FMECA team members, usually expressed by natural language.
  • 222
  • 16 Oct 2023
Topic Review
FN Baby Browning
The 1931 Fabrique Nationale ("FN") Baby Browning Pistol is a small blowback-operated semi-automatic pistol designed by Belgium-born Dieudonné Saive chambered in .25 ACP (6,35mm). The pistol features a six-round magazine capacity and is a striker-fired, single action, blow back mechanism. The manual thumb operated safety locks the slide in the closed position when engaged using side thumb pressure.
  • 5.2K
  • 14 Oct 2022
Topic Review
Foam Concrete
Foam concrete is a promising material in building and construction applications, providing such outstanding properties as high specific strength, excellent thermal insulation, and effective acoustic absorption in human-inhabited buildings.
  • 480
  • 03 Aug 2023
Topic Review
Focke-Achgelis Fa 223
The Focke-Achgelis Fa 223 Drache (English: Dragon) was a helicopter developed by Germany during World War II. A single 750-kilowatt (1,010 hp) Bramo 323 radial engine powered two three-bladed 11.9-metre (39 ft) rotors mounted on twin booms on either side of the 12.2-metre-long (40 ft) cylindrical fuselage. Although the Fa 223 is noted for being the first helicopter to attain production status, production of the helicopter was hampered by Allied bombing of the factory, and only 20 were built. The Fa 223 could cruise at 175 kilometres per hour (109 mph) with a top speed of 182 km/h (113 mph), and climb to an altitude of 7,100 m (23,300 ft). The Drache could transport cargo loads of over 1,000 kg (2,200 lb) at cruising speeds of 121 km/h (75 mph) and altitudes approaching 2,440 m (8,010 ft).
  • 512
  • 04 Nov 2022
Topic Review
Focke-Wulf Fw 189
The Focke-Wulf Fw 189 Uhu ("Eagle Owl") is a German twin-engine, twin-boom, three-seat tactical reconnaissance and army cooperation aircraft. It first flew in 1938 (Fw 189 V1), entered service in 1940 and was produced until mid-1944. In addition, Focke-Wulf used this airframe in response to a tender request by the RLM for a dedicated ground-attack airplane, and later submitted an armored version for trials. However, the Henschel Hs 129 was selected instead.
  • 1.1K
  • 01 Dec 2022
Topic Review
Focke-Wulf Ta 154
The Focke-Wulf Ta 154 Moskito was a fast twin-engined German night fighter aircraft designed by Kurt Tank and produced by Focke-Wulf during late World War II. Only a few were produced, proving to have less impressive performance than the prototypes.
  • 661
  • 19 Oct 2022
Topic Review
Focused Ultrasound for Atherosclerosis Treatment
Focused ultrasound (FUS) has emerged as a promising noninvasive therapeutic modality for treating atherosclerotic arterial disease. High-intensity focused ultrasound (HIFU), a noninvasive and precise modality that generates high temperatures at specific target sites within tissues, has shown promising results in reducing plaque burden and improving vascular function. While low-intensity focused ultrasound (LIFU) operates at lower energy levels, promoting mild hyperthermia and stimulating tissue repair processes. 
  • 321
  • 07 Sep 2023
Topic Review
Fog-Based IoT Platform Performance Modeling and Optimization
A fog-based IoT platform model involving three layers, i.e., IoT devices, fog nodes, and the cloud, was proposed using an open Jackson network with feedback. The system performance was analyzed for individual subsystems, and the overall system was based on different input parameters. Interesting performance metrics were derived from analytical results. A resource optimization problem was developed and solved to determine the optimal service rates at individual fog nodes under some constraint conditions.
  • 457
  • 19 Jun 2023
Topic Review
Food Control Achievements of NIR
Major milestones in the design of near infrared spectrometers as well as their demonstrated efficiency in the mitigation of food security issues with regards to commonly consumed food matrices are herein presented.   
  • 691
  • 18 Mar 2021
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