Although an explanation for the phenomenon was not provided until 1919, duralumin was one of the first " age hardening " alloys to be used, and was soon followed by many others.

Although anodized aluminium alloys can stand up to constant use, plain aluminium woks are too soft and damage easily.

Although the addition of copper improves strength, it also makes these alloys susceptible to corrosion.

Although molybdenum rich high speed steels such as AISI M1 have been used since the 1930s, material shortages and high costs caused by World War II spurred development of less expensive alloys substituting molybdenum for tungsten.

Although the materials that are most frequently processed by the Plansee Group are molybdenum and tungsten, it also works with other refractory metals such as tantalum, niobium and chromium as well as the associated alloys and composite materials.

Although improved modern alloys and manufacturing techniques have allowed even stronger cylinders, leading to larger and more powerful cartridges such as the. 454 Casull and. 480 Ruger in revolvers the same size as a. 44 Magnum, the. 44 Magnum is still considered a top choice today.

Although they were made of steel and brass, Perkins claimed that they were made of unusual metal alloys.

Although metallurgy did not spread to Mesoamerica until the Middle Ages, it was employed here and in the Andes for sophisticated alloys and gilding.

Although the site may not contain the features themselves, there are often opportunities to include them as additional interest to the site.

Although reactions to any drug may vary from person to person, generally those medications that contain aluminum or calcium are the likeliest to cause constipation, those that contain magnesium are the likeliest to cause diarrhea.

Although those of many marine species function first as males and then as females, their colonies always contain a combination of zooids that are in their male and female stages.

Although trade unions in Benin represent up to 75 % of the formal workforce, the large informal economy has been noted by the International Trade Union Confederation ( ITCU ) to contain ongoing problems, including a lack of women's wage equality, the use of child labour, and the continuing issue of forced labour.

Although this can be seen as social commentary, Chaplin's films did not contain overt political themes or messages until later on his career in the 1930s.

Although cumin seeds contain a relatively large percentage of iron, extremely large quantities of cumin would need to be consumed for it to serve as a significant dietary source ( see nutrition data ).

Although its texture is similar to milk and dark chocolate, it does not contain any cocoa solids.

Although he sought to slow or contain the New Deal and other federal programs, he did not attempt to repeal them outright and in doing so was popular among the liberal wing of the Republican Party.

Although the majority of WADs contain one or several custom levels mostly in the style of the original game, others implement new monsters and other resources, and heavily alter the gameplay ; several popular movies, television series, other video games and other brands from popular culture have been turned into Doom WADs by fans ( without authorization ), including Aliens, Star Wars, The X-Files, The Simpsons, South Park, Sailor Moon, Dragon Ball Z, Red Faction, The Thing, Pokémon and Batman.

Although Group VII viruses such as hepatitis B contain a DNA genome, they are not considered DNA viruses according to the Baltimore classification, but rather reverse transcribing viruses because they replicate through an RNA intermediate.

Although the Ediacaran Period does contain soft-bodied fossils, it is unusual in comparison to later periods because its beginning is not defined by a change in the fossil record.

Although several versions of many-worlds have been proposed since Hugh Everett's original work, they all contain one key idea: the equations of physics that model the time evolution of systems without embedded observers are sufficient for modelling systems which do contain observers ; in particular there is no observation-triggered wave function collapse which the Copenhagen interpretation proposes.

Although Johnson would attest in a 1984 radio interview that the " two tribes " of the song potentially represented any pair of warring adversaries ( giving the examples of " cowboys and Indians or Captain Kirk and Klingons "), the song does contain the line " On the air America / I modelled shirts by Van Heusen ", a clear reference to then US President Ronald Reagan, who had advertised for Phillips Van Heusen in 1953 ( briefly reviving the association in the early 1980s ), and whose first film had been titled Love Is On The Air.

Although independent of the IGI, the AF and PRF often contain duplications of IGI records.

Although it appears that globular clusters contain some of the first stars to be produced in the galaxy, their origins and their role in galactic evolution are still unclear.

Although many gelatin desserts incorporate fruit, some fresh fruits contain proteolytic enzymes ; these enzymes cut the gelatin molecule into peptides ( protein fragments ) too small to form a firm gel.

Although considered " small and primitive " by the standards of its time, it was the first working machine to contain all of the elements essential to a modern electronic computer.

Although heterocyclic compounds may be inorganic, most contain at least one carbon.

Although he agreed that the U. S. Constitution did not contain provisions for acquiring territory, Jefferson decided to go ahead with the purchase anyway in order to remove France's presence in the region and to protect both U. S. trade access to the port of New Orleans and free passage on the Mississippi River.

For anarchist historian George Woodcock " Although ( Pierre Joseph ) Proudhon was the first writer to call himself an anarchist, at least two predecessors outlined systems that contain all the basic elements of anarchism.

Although plant-derived foods do not naturally contain B < sub > 12 </ sub >, some are fortified during processing with added B < sub > 12 </ sub > and other nutrients .< ref > Vitamin A, in the form of beta-carotene, is available from plants such as carrots and spinach.

Although there is a convention that government committees contain at least one non-party member, a party membership is a definite aid in promotion and in being in crucial policy setting meetings.

Although it was dark as usual I could see that the hall had only recently contained a great many people.

Although there were only four fluids tested, it was apparent that there were two distinct types.

Although biopsies have shown structural changes in some of the reported cases of steroid-induced weakness, this case provides the only example known to us in which necropsy afforded the opportunity for extensive study of multiple muscle groups.

Although she weighed only 108 pounds when she visited him, Carroll permitted her to go on a 10-day fast in which she took nothing but water.

Although the training is only for one month, it is intensive and thorough.

Although the primary mathematical properties of the middle number at the center of the Lo Shu, and the interrelation of all the other numbers to it, might seem enough to account for the deep fascination which the Lo Shu held for the Old Chinese philosophers, this was actually only a beginning of wonders.

Although it was only three o'clock, he stopped in at the Golden Calf.

Although Lincoln won only a plurality of the popular vote, his victory in the electoral college was decisive: Lincoln had 180 and his opponents added together had only 123.

Although the name actually applies to a group of snakes, it is often used to refer only to one species in particular, the common or green anaconda, Eunectes murinus, which is one of the largest snakes in the world.

Although the entrance to the chamber warns against disturbing him, Shrewsbury opens Alhazred's sarcophagus anyway, finding that only rags, bones, and dust remain of Alhazred.

Although only one of his four children survived to adulthood, Antoninus came to be ancestor to generations of prominent Roman statesmen and socialites, including at least one empress consort.

Although at least three pads were planned, only two, designated A and B, were completed in October 1965.

Although amaranth was cultivated on a large scale in ancient Mexico, Guatemala, and Peru, nowadays it is only cultivated on a small scale there, along with India, China, Nepal, and other tropical countries ; thus, there is potential for further cultivation in those countries, as well as in the U. S. In a 1977 article in Science, amaranth was described as " the crop of the future.

Although the Visigoths plundered Rome, they treated its inhabitants humanely and burned only a few buildings.

Although many other chemists have repeated this advice, IUPAC and most chemistry texts still favour the usage of allotrope and allotropy for elements only.

Although Ares received occasional sacrifice from armies going to war, the god had a formal temple and cult at only a few sites.

Although used for similar purposes, transparent colors and image masks do not permit the smooth blending of the superimposed image pixels with those of the background ( only whole image pixels or whole background pixels allowed ).

Although cheap and effective in enabling use of some software that only used official ROM entry points for text output, this solution proved very slow because the Electron had to be placed into an 80-byte-pitch display to be able to get anywhere near to reproducing mode 7 and the CPU spent a lot of time drawing approximations of mode 7 characters and graphics that in a hardware solution would be achieved without any CPU processing.

Although this produced a mode 7 that barely impacted upon CPU performance and gave the same visual quality as the BBC Micro, it remained compatible only with software that used the ROM routines for outputting text and graphics and still used 10 kB of memory for the display.

Although programs can alter the position of the screen in memory, the non-linear format of the display means that vertical scrolling can only be done in blocks of 8 pixels without further work.

Although there have been periodic initiatives to revive their use, airships have seen only niche application since that time.

Although most audio file formats support only one type of audio data ( created with an audio coder ), a multimedia container format ( as Matroska or AVI ) may support multiple types of audio and video data.

Although the absolute numerical values of astronomical and historical years only differ by one before year 1, this difference is critical when calculating astronomical events like eclipses or planetary conjunctions to determine when historical events which mention them occurred.

Although it has only 6. 14 percent of Alaska's land area, it is larger than the state of Maine, and almost as large as the state of Indiana.