QUES: The first blue-violet LED using magnesium-doped gallium nitride was made at Stanford University in 1972 by Herb Maruska and Wally Rhines, doctoral students in materials science and engineering. At the time Maruska was on leave from RCA Laboratories, where he collaborated with Jacques Pankove on related work. In 1971, the year after Maruska left for Stanford, his RCA colleagues Pankove and Ed Miller demonstrated the first blue electroluminescence from zinc-doped gallium nitride, though the subsequent device Pankove and Miller built, the first actual gallium nitride light-emitting diode, emitted green light. In 1974 the U.S. Patent Office awarded Maruska, Rhines and Stanford professor David Stevenson a patent for their work in 1972 (U.S. Patent US3819974 A) and today magnesium-doping of gallium nitride continues to be the basis for all commercial blue LEDs and laser diodes. These devices built in the early 1970s had too little light output to be of practical use and research into gallium nitride devices slowed. In August 1989, Cree introduced the first commercially available blue LED based on the indirect bandgap semiconductor, silicon carbide (SiC). SiC LEDs had very low efficiency, no more than about 0.03%, but did emit in the blue portion of the visible light spectrum.[citation needed]

What students developed the first red-violet LED?
What is the answer?
ANS: unanswerable
QUES: Robert N. Bellah has in his writings that although the separation of church and state is grounded firmly in the constitution of the United States, this does not mean that there is no religious dimension in the political society of the United States. He used the term "Civil Religion" to describe the specific relation between politics and religion in the United States. His 1967 article analyzes the inaugural speech of John F. Kennedy: "Considering the separation of church and state, how is a president justified in using the word 'God' at all? The answer is that the separation of church and state has not denied the political realm a religious dimension."

What doesn't Bellah use the term "civil religion' to describe?
What is the answer?
ANS: unanswerable
QUES: The Amoy dialect (Xiamen) is a hybrid of the Quanzhou and Zhangzhou dialects. Taiwanese is also a hybrid of these two dialects. Taiwanese in northern Taiwan tends to be based on the Quanzhou variety, whereas the Taiwanese spoken in southern Taiwan tends to be based on Zhangzhou speech. There are minor variations in pronunciation and vocabulary between Quanzhou and Zhangzhou dialects. The grammar is generally the same. Additionally, extensive contact with the Japanese language has left a legacy of Japanese loanwords in Taiwanese Hokkien. On the other hand, the variants spoken in Singapore and Malaysia have a substantial number of loanwords from Malay and to a lesser extent, from English and other Chinese varieties, such as the closely related Teochew and some Cantonese.

What are the differences between Taiwanese and Chinese dialects?
What is the answer?
ANS:
unanswerable