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Digitale Medien

Remnants of Bose condensation and off-diagonal long range order in finite systems (1993)

Campbell, C. E.

Springer

Journal of low temperature physics 93 (1993), S. 907-919

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ISSN: 1573-7357

Schlagwort(e): 67.40.-w ; 67.40.Db ; 05.30.Jp

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract We briefly review some general aspects of Bose condensation and off-diagonal long range order in infinite bulk systems and then discuss to what extent these features might be manifested in finite systems with free surfaces such as droplets of liquid 4 He at low temperatures. We focus on the structure of the one-body density matrix and the macroscopic wave function in the surface region, and note the possibility of a surface condensate.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00692038

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Digitale Medien

Comparison of techniques for extracting volatile compounds from conifer needles (1990)

Muzika, R. -M. ; Campbell, C. L. ; Hanover, J. W. ; [weitere]

Springer

Journal of chemical ecology 16 (1990), S. 2713-2722

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ISSN: 1573-1561

Schlagwort(e): Monoterpenes ; Abies grandis ; Picea pungens ; steam distillation ; extraction ; secondary chemicals ; grand fir ; blue spruce ; coefficient of variation ; MANOVA

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Chemie und Pharmazie

Notizen: Abstract Five extraction techniques were used to obtain quantitative measurements of monoterpenes from blue spruce and grand fir needles. Multivariate analysis of variance indicated that there was a significant difference in the amount of each monoterpene extracted by using different techniques. For both species, an 8-hr steam distillation of 10 g of material yielded the greatest amount of each monoterpene. This technique was also the most reproducible in that the coefficients of variation were lowest. A rapid steam distillation was relatively effective for grand fir, but not for blue spruce. A CO2 extraction was unreliable for both species.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00988080

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Digitale Medien

Can Australian farming systems be more sylvan? (1993)

Campbell, C. A.

Springer

Agroforestry systems 22 (1993), S. 17-24

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ISSN: 1572-9680

Schlagwort(e): Australian farming systems ; extension ; farmer attitudes ; revegetation ; policy vision

Quelle: Springer Online Journal Archives 1860-2000

Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft

Notizen: Abstract This paper discusses the extent to which Australian agriculture is integrating trees into farming systems and concludes that while broad environmental awareness and concern may have increased, Australian agriculture exemplifies essentially the same attitudes to native vegetation as those held by the first European settlers. It is suggested that for real change to occur, land users require three key ingredients — commitment, knowledge and resources. The state of play with respect to each of these key factors is reviewed and suggestions for reform mooted.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00707466

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