22 research outputs found
Complementarity in classical dynamical systems
The concept of complementarity, originally defined for non-commuting
observables of quantum systems with states of non-vanishing dispersion, is
extended to classical dynamical systems with a partitioned phase space.
Interpreting partitions in terms of ensembles of epistemic states (symbols)
with corresponding classical observables, it is shown that such observables are
complementary to each other with respect to particular partitions unless those
partitions are generating. This explains why symbolic descriptions based on an
\emph{ad hoc} partition of an underlying phase space description should
generally be expected to be incompatible. Related approaches with different
background and different objectives are discussed.Comment: 18 pages, no figure
Mineral nutrition of vegetable crops: XXV - Mineral nutrition of new zealand spinach plant (Tetragonia expansa Murr.)
The present work was carried out in order to study: a - the effect of omission and presence of the macronutrients and boron on the growth of the plants; b - deficiency symptoms of macronutrients, as well of boron; c - the effect of the deficiency of each nutrient on the chemical composition of the plants. Young spinach plants were grown in pots containing pure quartz sand. Several times a day the plants were irrigated by percolation with nutrient solutions. The treatments were: complete solution and deficient solution, in which each one of the macronutrients was omitted as well boron. Soon as the malnutrition symptoms appered, the plants were harvested and analysed chemically. - symptoms of malnutrition are easily observed for N, K, Ca and B. - symptoms of malnutrition for P, S and Mg are not easily identified. - the nutrient content, in dry matter, in deficient leaves and healthy leaves is:O trabalho teve como objetivo estudar alguns aspectos da nutrição mineral do espinafre (Tetragonia expansa Murr.) no que concerne: 1 - Efeitos da omissĂŁo dos macronutrientes e do boro, na obtenção de um quadro sintomatolĂłgico; 2 - Efeitos das carĂŞncias na produção de matĂ©ria seca e composição quĂmica da planta. Mudas com trinta dias de idade foram transplantadas para soluções nutritivas carentes nos macronutrientes e/ou em boro. A coleta das plantas foi realizada quando os sintomas de deficiĂŞncia se tornaram evidentes. No material seco procedeu-se a análise quĂmica. Os dados mostram que: 1 - os sintomas visuais de deficiĂŞncia de N, K, Ca e B apresentam-se bem definidos; sendo que os de P, Mg e S sĂŁo de difĂcil caracterização ; 2 - os teores dos nutrientes em plantas sadias e deficientes sĂŁo
Poor prognostic value of proliferating cell nuclear antigen labelling index in breast carcinoma.
Nutrição mineral de hortaliças: XXV - deficiência de macronutrientes e de boro em espinafre (Tetragonia expansa Murr.)
Ni-exchanged AlSBA-15 mesoporous materials as outstanding catalysts for ethylene oligomerization
Electroweak measurements in electron–positron collisions at w-boson-pair energies at lep
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