Results 111 to 120 of about 443,866 (305)
Possibilities for drag reduction by boundary layer control [PDF]
The mechanics of laminar boundary layer transition are reviewed. Drag possibilities for boundary layer control are analyzed using assumed conditions of transition Reynolds number, inlet loss, number of slots, blower efficiency, and duct losses.
Naiman, I.
core +1 more source
Anti‐Slip Material‐Based Strategies and Approaches
Advanced Materials Technologies, EarlyView.This review highlights the principle mechanisms of slipping at the microscale, linking contact mechanics with a friction behavior model for surface interfaces. Main strategies to develop anti‐slip properties to the surfaces are discussed alongside standardized testing approaches.
Sogand Abbaspoor‐Zanjani +3 more
wiley +1 more source
After the death of inflation: will fiscal drag survive? [PDF]
Declining inflation rates might have negative consequences for tax revenues. Phenomena such as the inflationary bracket creep in a progressive income tax system do not work any longer.
Friedrich Heinemann
core +3 more sources
A Performance Analysis of Folding Conformal Propeller Blade Designs [PDF]
NASAs X-57 Maxwell flight demonstrator has a high-lift system that includes 12 fixed- pitch high-lift propellers located upstream of the wing leading edge for lift augmentation at low speeds.
Derlaga, Joseph M. +1 more
core +1 more source
Thermopower in the strongly overdoped region of single-layer Bi2Sr2CuO6+d superconductor
, 2002 The evolution of the thermoelectric power S(T) with doping, p, of single-layer Bi2Sr2CuO6+d ceramics in the strongly overdoped region is studied in detail.
A. Forget +33 more
core +1 more source
Summarization: Drilling through the subsurface is a complex operation and problems are almost guaranteed to occur. Therefore, understanding and anticipating drilling problems, understanding their causes and planning solutions are necessary for successfully reaching the target. The most prevalent drilling problems include pipe sticking, lost circulation,
Azeez Mustafa(http://users.isc.tuc.gr/~mazeez) +1 more
openaire +1 more source
Development of Heat Engines Powered by Twisted and Coiled Polymer Fiber Actuators
Advanced Materials Technologies, EarlyView.Continuously rotating engines driven by thermally responsive actuating materials can turn waste heat into useful energy. For the first time heat engines operated by twisted and coiled polymer fiber actuators are demonstrated with engine design guided by two simple analytical models.
Geoffrey M. Spinks +2 more
wiley +1 more source
Drag Reduction Through Air-Trapping Discrete Grooves in Underwater Applications
Journal of Marine Science and EngineeringVehicles travelling underwater experience drag and the frictional drag costs 60% of the total energy consumption. Using trapped air serving as a lubricant is a promising way to reduce drag.
You Nie, Ding Weng, Jiadao Wang
doaj +1 more source
Inverse‐Designed on‐Chip Terahertz Three‐Channel Mode and Wavelength Division Demultiplexer
Advanced Photonics Research, EarlyView.An ultracompact terahertz demultiplexer is developed using a hybrid inverse design that combines genetic algorithms with topology optimization. The device enables simultaneous mode‐ and wavelength‐division multiplexing within a footprint smaller than two wavelengths.
Faqian Chong +5 more
wiley +1 more source
Journal of Marine Science and EngineeringThe study of aquatic organisms’ ectomorphology is important to understanding the mechanisms of efficient swimming and drag reduction in fish. The drag reduction mechanism in fish remains unknown yet is needed for optimising the efficiency of bionic fish.
Xiaoshuang Huang +6 more
doaj +1 more source