منابع مشابه
Synchrotron Radiation Studies on Even-Odd and Odd-Even Nylons
Aliphatic polyamides derived from odd diamine or odd dicarboxylic acid units cannot adopt a conventional sheet structure when molecular chains have an all trans conformation. However, typical fiber diffraction patterns of this sheet structure were observed in several polyamides derived from odd units such as nylons 65 and 56. Consequently, a new structure based on the establishment of intermole...
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In 6] Misra introduced the powerlist notation and used it to succintly describe several parallel algorithms. In particular, algorithms that use a balanced divide and conquer strategy have elegant descriptions as powerlist functions. Among the examples presented were two sorting networks due to Batcher 1]. To prove their correctness a-posteriori, Misra used the 0-1 principle, which states that a...
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1. Introduction. It is a lovely fact that n] = f1; 2; : : : ; ng, n 1, has as many subsets X with an even cardinality jXj as those with an odd cardinality, namely 2 n?1 of both. To prove it, pair every subset X with X 1 where X 1 is Xnf1g if 1 2 X and X f1g if 1 6 2 X. Then X 7 ! X 1 is an involution that changes the parity of jXj and the result follows. More generally, in enumerative combinato...
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Air pollution is a big concern in a city like Delhi where more than 16 million people are exposed to severely high pollutant concentrations on an annual average basis. It is in this regard that the Government of Delhi introduced Odd-Even scheme in which plying of privately owned cars was restricted on alternate days based on the last digit (odd/even) of the registration number. However, there w...
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ژورنال
عنوان ژورنال: Science
سال: 2020
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.367.6485.1439-e