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ISO 3166-1 (Codes for the representation of names of countries and their subdivisions – Part 1: Country codes) is a standard defining codes for the names of countries, dependent territories, and special areas of geographical interest.
From 8 May, only the A&M tritium results kept cold fusion afloat. [58] In July and November 1989, Nature published papers critical of cold fusion claims. [59] [60] Negative results were also published in several other scientific journals including Science, Physical Review Letters, and Physical Review C (nuclear physics). [notes 4]
Their radiative forcing is estimated at 1.3–1.4 that of CO 2 alone, excluding induced cirrus cloud. In 2018, global commercial operations generated 2.4% of all CO 2 emissions. [220] The aviation industry has become more fuel efficient. But overall emissions have risen as the volume of air travel has increased.
Ordinal numbers may be written in English with numerals and letter suffixes: 1st, 2nd or 2d, 3rd or 3d, 4th, 11th, 21st, 101st, 477th, etc., with the suffix acting as an ordinal indicator. Written dates often omit the suffix, although it is nevertheless pronounced.
The second derivative of a function f can be used to determine the concavity of the graph of f. [2] A function whose second derivative is positive is said to be concave up (also referred to as convex), meaning that the tangent line near the point where it touches the function will lie below the graph of the function.
A fire is ignited under a cauldron, A B, (fig. 50), containing water, and covered at the mouth by the lid C D; with this the bent tube E F G communicates, the extremity of the tube being fitted into a hollow ball, H K. Opposite to the extremity G place a pivot, L M, resting on the lid C D; and let the ball contain two bent pipes, communicating ...
Transrapid 09 at the Emsland test facility in Lower Saxony, Germany A full trip on the Shanghai Transrapid maglev train Example of low-speed urban maglev system, Linimo. Maglev (derived from magnetic levitation) is a system of rail transport whose rolling stock is levitated by electromagnets rather than rolled on wheels, eliminating rolling resistance.
One national park, the Corcovado National Park, is internationally renowned among ecologists for its biodiversity (including big cats and tapirs) and is where visitors can expect to see an abundance of wildlife. [52] [53] Corcovado is the one park in Costa Rica where all four Costa Rican monkey species can be found. [54]