Question: By the late 1990s, blue LEDs became widely available. They have an active region consisting of one or more InGaN quantum wells sandwiched between thicker layers of GaN, called cladding layers. By varying the relative In/Ga fraction in the InGaN quantum wells, the light emission can in theory be varied from violet to amber. Aluminium gallium nitride (AlGaN) of varying Al/Ga fraction can be used to manufacture the cladding and quantum well layers for ultraviolet LEDs, but these devices have not yet reached the level of efficiency and technological maturity of InGaN/GaN blue/green devices. If un-alloyed GaN is used in this case to form the active quantum well layers, the device will emit near-ultraviolet light with a peak wavelength centred around 365 nm. Green LEDs manufactured from the InGaN/GaN system are far more efficient and brighter than green LEDs produced with non-nitride material systems, but practical devices still exhibit efficiency too low for high-brightness applications.[citation needed]
Try to answer this question if possible: What are cladding layers?
Answer: active region consisting of one or more InGaN quantum wells sandwiched between thicker layers of GaN
Question: To determine what information in an audio signal is perceptually irrelevant, most lossy compression algorithms use transforms such as the modified discrete cosine transform (MDCT) to convert time domain sampled waveforms into a transform domain. Once transformed, typically into the frequency domain, component frequencies can be allocated bits according to how audible they are. Audibility of spectral components calculated using the absolute threshold of hearing and the principles of simultaneous maskingthe phenomenon wherein a signal is masked by another signal separated by frequencyand, in some cases, temporal maskingwhere a signal is masked by another signal separated by time. Equal-loudness contours may also be used to weight the perceptual importance of components. Models of the human ear-brain combination incorporating such effects are often called psychoacoustic models.
Try to answer this question if possible: What may be used to weight the importance of components?
Answer: Equal-loudness contours
Question: The administration continues to follow the market reform plans of the previous one and indicated that it will diversify Iran's oil-reliant economy. Iran has also developed a biotechnology, nanotechnology, and pharmaceuticals industry. However, nationalized industries such as the bonyads have often been managed badly, making them ineffective and uncompetitive with years. Currently, the government is trying to privatize these industries, and, despite successes, there are still several problems to be overcome, such as the lagging corruption in the public sector and lack of competitiveness. In 2010, Iran was ranked 69, out of 139 nations, in the Global Competitiveness Report.
Try to answer this question if possible: What Iranian nationalized industry has been noncompetitive and managed badly?
Answer: the bonyads
Question: During the late 1920s and early 1930s, Eisenhower's career in the post-war army stalled somewhat, as military priorities diminished; many of his friends resigned for high-paying business jobs. He was assigned to the American Battle Monuments Commission directed by General Pershing, and with the help of his brother Milton Eisenhower, then a journalist at the Agriculture Department, he produced a guide to American battlefields in Europe. He then was assigned to the Army War College and graduated in 1928. After a one-year assignment in France, Eisenhower served as executive officer to General George V. Mosely, Assistant Secretary of War, from 1929 to February 1933. Major Dwight D. Eisenhower graduated from the Army Industrial College (Washington, DC) in 1933 and later served on the faculty (it was later expanded to become the Industrial College of the Armed Services and is now known as the Dwight D. Eisenhower School for National Security and Resource Strategy).
Try to answer this question if possible: During the 1920s, for what federal department did Milton Eisenhower work?
Answer:
Agriculture