For air-breathing SSTO, the main challenge is system complexity and associated research and development costs, material science, and construction techniques necessary for surviving sustained high-speed flight within the atmosphere, and achieving a high enough mass-ratio to carry sufficient propellant to achieve orbit, plus a meaningful payload weight.

This is one of the main reasons for National Library Week, April 16-22, and for its theme: `` For a richer, fuller life, read ''!!

For more information follow the links to the main articles.

For example the standard glutamic acid ( glutamate ) and the non-standard gamma-amino acid gamma-amino-butyric acid ( GABA ) are respectively the brain's main excitatory and inhibitory neurotransmitters, hydroxyproline-a major component of the connective tissue collagen-is synthesised from proline, the standard amino acid glycine is used to synthesise porphyrins used in red blood cells, and the non-standard carnitine is used in lipid transport.

For each round, a subkey is derived from the main key using Rijndael's key schedule ; each subkey is the same size as the state.

For example, the main crossover of the Andes between Argentina and Chile is still accomplished through the Paso Internacional Los Libertadores.

For the next 100 years the Anadyr was the main route from the Arctic to the Pacific and Kamchatka.

For a monatomic ideal gas,, and for a diatomic gas ( such as nitrogen and oxygen, the main components of air ).

For example, a main battle tank will usually have the heaviest armour on the hull front and the turret, lighter armour on the sides of the hull and the thinnest armour on the top and bottom of the tank.

For drivers, the main route through the region is the rapid A 5 ( E35 ) motorway, but a variety of sign-posted scenic routes such as the Schwarzwaldhochstraße (, Baden-Baden to Freudenstadt ), Schwarzwald Tälerstraße (, the Murg and Kinzig valleys ) or Badische Weinstraße ( Baden Wine Street,, a wine route from Baden-Baden to Weil am Rhein ) offers calmer driving along high roads.

For example The Kid is thought to reflect Chaplin's own childhood trauma of being sent into an orphanage and the main characters in Limelight ( 1952 ) are thought to contain elements from the lives of his parents.

( For diagrams and full descriptions, see Contra Dance Form main article.

According to Love, her main focus in the band from very early on was on lyrics: " For me, I was just about lyrics and performance.

For this reason, editors choose cutaway shots related to the main action, such as another action or object in the same location.

For example, if the main shot is of a man walking down an alley, possible cutaways may include a shot of a cat on a nearby dumpster or a shot of a person watching from a window overhead.

For example, Ecuador has closed its main border crossing with Colombia every night since August 2002, when evidence emerged that Colombian guerrillas and paramilitaries were asserting control over Ecuador's border communities.

For the first four albums Mombassa and Noel Crombie, who had been the main designer of Split Enz's artwork, assisted Seymour in creating sets and costumes.

For the 2004 video game The Bard's Tale, he served as scriptwriter, improviser, and voice actor of the main character The Bard.

For the list of the members of the Holy Synod and their official titles see main article The Holy Synod of the Coptic Orthodox Patriarchate of Alexandria

For each problem, the Institute had a professional mathematician write up an official statement of the problem, which will be the main standard by which a given solution will be measured against.

For any source material of specific composition, the main variables that affect the purity of products in continuous distillation are the reflux ratio and the number of theoretical equilibrium stages ( practically, the number of trays or the height of packing ).

For main article, see English and French Deism in the Eighteenth Century

For all these authors, one of the main illustrations is the phase transitions of water.

For more information, see the main article on Bifurcation theory.

For example, one population of a species of tropical lizards ( Tropidurus hispidus ) has a flattened body relative to the main populations that live in open savanna.

For instance, something or someone ugly on the outside can be beautiful on the inside, which is one of the main points of Plato's dialogue, Alcibiades, and the Symposion, in which Alcibiades also appears.

For bassists with smaller hands, the large spaces between pitches may present a significant challenge, especially in the lowest range, where the spaces between notes are largest.

For the first time since 1897 there was no ultimate match — either “ challenge final ” or “ grand final ” — to determine the premiers.

For example, a firewall designed to meet National Fire Protection Agency, ( NFPA ), 221-09 section A. 5. 7 which indicates an average temperature of 800 ° F, is not designed to withstand higher temperatures such as would be present in higher challenge fires, and as a result would fail in a time less than the wall rating.

For example, air begins to absorb significantly around the 193 nm wavelength ; moving to sub-193 nm wavelengths would require installing vacuum pump and purge equipment on the lithography tools ( a significant challenge ).

For instance, quantum mechanics gives an independent motivation to challenge the principle of sufficient reason.

For example, Haarlem resident Theodorus Schrevelius noted that Hals ' works reflected ' such power and life ' that the painter ' seems to challenge nature with his brush '.

For its historical impact through the centuries, Cambridge was widely recognized as the most influential European University, one that " continues to play a very particular role for the university consciousness in the world ," Its decision to confer an honorary degree to Derrida was seen as a challenge to the apparent hegemony of the Anglo-American Analytic philosophy over most of the philosophy departments of the Anglophone world.

For the first few years Patriarch Sergius of Constantinople managed to keep him silent, but when Sophronius was appointed Patriarch of Jerusalem in 634, he used his newfound position of authority to challenge the validity of the doctrine of Monoenergism.

For all his sycophantic devotion to Mr. Burns, Smithers has been willing to challenge him on at least two occasions, most significantly in the " Who Shot Mr. Burns?

For example, in the position at right, the challenge is to place a white king, queen, rook, knight, and bishop in the five marked squares so that the squares with numbers in them are attacked zero and four times respectively.

For all of these reasons, editing the manuscript has been a challenge and even successful editors are forced to exercise a great deal of judgment in preparing print editions.

For example, a 3 kyu player gives a 7 kyu player four handicap stones to allow for an interesting game with roughly equal challenge for both players.

For example, in the eight queens problem the challenge is to place eight queens on a standard chessboard so that no queen attacks any other.

For example, Bob Jones particularly sought to challenge the public position of the Moral Majority and was known to make public statements that the Moral Majority was an instrument of Satan.

There are several other scientists, however, who challenge this approach, and argue that psychophysiological studies do not support the idea that the person is dreaming during an OBE For example, Frederick Aardema ( 2012 ), a clinical researcher, argues that dreaming is just one of the many different modes of consciousness a person may enter during an OBE.

For Rothko, this commission presented a new challenge for it was the first time he was required not only to design a coordinated series of paintings, but to produce an artwork space concept for a large, specific interior.

For fight number 16, Pedroza traveled on the last week of March 1976, to Mexicali, Mexico, to challenge WBA world bantamweight champion Alfonso Zamora for the world title.

Barry was one of the original patent-holders of the actors ' company, which opened at Lincoln's Inn Fields with the smash hit of William Congreve's Love For Love in 1695 and continued to successfully challenge Rich's United Company.

For example, the variations in mindset between Democratic Party and Republican Party Presidents in the U. S. may have made that country more able to challenge assumptions than the Kremlin with its more static bureaucracy.

For example, in a challenge from the US version, players are given two watches.

For example, in one challenge in the second United States series, host Anderson Cooper was eating an apple.

For example, the 1966 Honda 450 cc dohc 180 ° parallel-twin “ Black Bomber " could challenge contemporary British 650 cc 360 ° twins.

For example, a system with two dual-core hyper-threaded CPUs presents a challenge to a scheduling algorithm.