essay on condensed matter physics in 20th century

Ngày tải lên: 24/04/2014, 17:20

Ngày tải lên: 17/03/2014, 14:38

... A † phonon annihilation and creation operator Sec. 16.1 b annihilation operator for particle (boson, phonon) b † creation operator for particle (boson, phonon) b ± n amplitudes of wavefunctions ... can contain both discrete and continuous quantum numbers. In that case the symbol  ν is to be interpreted as a combination of both summations and integrations. For example in the case in Eq....

Ngày tải lên: 24/04/2014, 17:13

Ngày tải lên: 24/01/2014, 17:36

... kg/ha in 1973-74 (Government of Kenya 1969, 1977). By contrast, capital intensification in maize production in South Africa up to the 1980s seemingly continued to be mainly confined to diffusion ... 20 th century s standard textbook on tropical agronomy (Wil - lis 1909, 179-90, 200-16 10 ) and in the 1940s in international discussions on the optimal production organisatio...

Ngày tải lên: 21/02/2014, 04:20

... history of environ- mental science can provide valuable information to anyone who is interested in tracing the long- term changes in the environment. All in all, the long-term interaction between ... Studies in 1883. In the beginning its tasks were mainly connected with controlling the quality of foodstuffs and drinking water, but later also with monitoring and solving pollutio...

Ngày tải lên: 29/03/2014, 21:20

... These individuals played a pioneering role in the evolution of intel- lectual activity among Africans in the nineteenth century. They distin- guished themselves in their various fields, rising to ... modernity in their own right. In the area of Christianity, which was embryonic in early nineteenth century South Africa, Ntsikana made a pioneering contribution to hymn-writing i...

Ngày tải lên: 15/02/2014, 11:20

... These conflicts in turn eroded the st abilit y of an honor culture, as Frank Henderson Stewart explains: “Once the shift is made from basing honor on a certain kind of behavior (always winning in ... sensation of being in a large group of people and yet feeling entirely alone. In large populations you can live out your whole life without anyone checking up on what you’re doing, mu...

Ngày tải lên: 14/03/2014, 09:32

Ngày tải lên: 21/03/2014, 22:00

... trading. 16 4.1 Trends in Bond Financing The decline in bond trading on the exchange has occurred despite broad increases in the supply of bonds outstanding in all sectors. Figure 3 c ombines data from ... their bonds, it may be economically wasteful to maintain the infrastructure to provide continuous price quotations. On the other hand, investors may rarely trade their bonds bec...

Ngày tải lên: 22/03/2014, 20:20