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11.
In this paper, we define a new generalized difference sequence space involving lacunary sequence. Then, we examine k-NUC property and property (β) for this space and also show that it is not rotund where p = (pr) is a bounded sequence of positive real numbers with pr ≥ 1 for all r ∈ N. 相似文献
12.
Elena Tsankova 《Tetrahedron letters》1982,23(7):771-774
The lactone was found to be a co-product of the BF3 etherate induced cyclization of epoxyisogermacrone . The keton when treated with 100% HCOOH afforded the lactone while under the same conditions the ketol gave the corresponding ester . A mechanism is suggested for the rearrangements. 相似文献
13.
Convey P BRITISH ANTARCTIC SURVEY NATURAL ENVIRONMENT RESEARCH COUNCIL HIGH CROSS MADINGLEY ROAD CAMBRIDGE CB ET 《Cryo letters》2000,21(2):73-82
Short summer seasons with low thermal energy input characterise polar ecosystems. Climatic variables and physical isolation of terrestrial habitats act as selective filters which must be passed to allow colonisation, establishment and survival in these extreme environments. Life history studies of the terrestrial biota of such ecosystems give little evidence of adaptive responses to low temperatures having evolved in situ, even though behavioural, ecophysiological and biochemical features allowing tolerance of the likely extremes are well-developed. Observed life history strategies are often consistent with the general predictions of adversity (A) or stress (S) selection. However, biota successful in these extreme environments may be better-grouped by the lack of particular life history features, rather than common possession. 相似文献
14.
In this article, we introduce the concept of lacunary statistical convergence of order α of real number sequences and give some inclusion relations between the sets of lacunary statistical convergence of order α and strong Nθα(p)-summability. Furthermore, some relations between the spaces NθαSθα are examined. 相似文献