Considerations on Some Ecological Principles

1984 ◽  
pp. 145-162 ◽  
Author(s):  
Oscar Ravera
Keyword(s):  
Ecological Principles

Perceptual-Imaginative Space and the Beautiful Ecologies of Rose Lowder's Bouquets

Paragraph ◽  
2020 ◽  
Vol 43 (3) ◽  
pp. 314-329
Author(s):  
Sarah Cooper
Keyword(s):  
Twentieth Century ◽  
Moral Philosophy ◽  
Ecological Principles ◽  
Short Films ◽  
Ecological Concern

Experimental filmmaker Rose Lowder is an intricate explorer of perception. Many of her exquisite silent short films feature flowers that are scrutinized frame by frame in shots that appear to have layers, as well as volume, and to quiver between simultaneity and succession. Yet these perceptual palimpsests that present almost too much for the eye to take in also reveal an as yet unexplored relation to imagination. Informed by ecological principles and foregrounding floral beauty, Lowder's Bouquets create a striking bond between perceptual and imaginative space. This article draws upon twentieth-century phenomenological accounts of perception before delving into earlier historical discussions of beauty in nature and in art, and bringing out connections to moral philosophy and feminist ecophilosophy, in order to understand how the beautiful entwines with ecological concern in the perceptual-imaginative space of her films.

A New, Necessary and Sufficient Vertex Solution for Robust Stability Check of Unstructured Convex Combination Matrix Families

2015 ◽  
Author(s):  
Rama K. Yedavalli
Keyword(s):  
Robust Stability ◽  
Convex Combination ◽  
Convexity Property ◽  
Ecological Principles ◽  
Sign Structure ◽  
Previous Solution ◽  
Peer Community ◽  
The Stability ◽  
Necessary And Sufficient ◽  
Complete Dependence

This paper revisits the problem of checking the robust stability of matrix families generated by ‘Unstructured Convex Combinations’ of user supplied or externally supplied Vertex Matrices. A previous solution given by the author for this problem involved complete dependence on the quantitative (eigenvalue information) of a set of special matrices labeled the Kronecker Nonsingularity (KN) matrices. In this solution, the ‘convexity’ property is not explicit and transparent, to the extent that, unfortunately, the accuracy of the solution itself is being questioned and not embraced by the peer community. To erase this unforunate and unwarranted image of this author (in this specific problem) in the minds of the peer community, in this paper, the author treads a new path to find a solution that brings out the convexity property in an explicit and understandable way. In the new solution presented in this paper, we combine the qualitative (sign) as well as quantitative (magnitude) information of these KN matrices and present a vertex solution in which the convexity property of the solution is transparent making it more elegant and accepatble to the peer community, than the previous solution. The new solution clearly underscores the importance of using the sign structure of a matrix in assessing the stability of a matrix. This new solution is made possible by the new insight provided by the qualitative (sign) stability/instability derived from ecological principles. Examples are given which clearly demonstrate effectiveness of the new, convexity based algorithm. It is hoped that this new solution will be embraced by the peer community.

scholarly journals Pesticide dosing must be guided by ecological principles

2020 ◽  
Vol 4 (12) ◽  
pp. 1575-1577
Author(s):  
Théotime Colin ◽  
Coline Monchanin ◽  
Mathieu Lihoreau ◽  
Andrew B. Barron
Keyword(s):  
Ecological Principles

scholarly journals Research on the Enhancement Effects of Using Ecological Principles in Managing the Lifecycle of Industrial Land

2018 ◽  
Vol 10 (6) ◽  
pp. 2076 ◽  
Author(s):  
Libin Guo ◽  
Lina Han ◽  
Huikun Hong ◽  
Tao Zhou
Keyword(s):  
Industrial Land ◽  
Ecological Principles

Regeneration methods for dipterocarp forests of wet tropical Asia

2003 ◽  
Vol 79 (2) ◽  
pp. 263-267 ◽  
Author(s):  
Mark S Ashton
Keyword(s):  
Land Use Planning ◽  
Forest Type ◽  
Forest Products ◽  
The Philippines ◽  
Tropical Asia ◽  
Ecological Principles ◽  
Dipterocarp Forests ◽  
Non Timber Forest Products ◽  
History Of ◽  
Wet Tropics

Dipterocarp forests of the Asian wet tropics have a long history of silvicultural research. This paper provides a review of this history and a summary of the ecological principles guiding the regeneration methods used. Dipterocarp forests are here defined as those of the seasonally wet regions of Thailand, Burma, and India, and those that are considered of the mixed dipterocarp forest type that dominate the aseasonal wet regions of Sri Lanka, Malaysia, and parts of Indonesia and the Philippines. Two silvicultural regeneration methods are described, shelterwoods and their variants, and selection systems. Both systems can be justified but emphasis is given to the development of shelterwood and selection regeneration methods that are tailored to the particular biological and social context at hand. The paper concludes with a call for improved land-use planning and stand typing to better integrate service and protection values with those values focused on commodity production. Key words: Dipterocarpus, hill forest, non-timber forest products, polycyclic, regeneration, selection, shelterwood, Shorea

The Roots of Human Ecology

2017 ◽  
Author(s):  
William R. Burch ◽  
Gary E. Machlis ◽  
Jo Ellen Force
Keyword(s):  
Social Science ◽  
Plant Community ◽  
Human Activity ◽  
Human Ecology ◽  
Natural Areas ◽  
Ecological Principles ◽  
Literature Reviews ◽  
Biological Concepts ◽  
The University ◽  
Early Human

This chapter looks at how the roots of human ecology lie primarily in general ecology, sociology, geography, and anthropology, as documented by numerous literature reviews. The idea for the application of general ecological principles to human activity was sparked by sociologists at the University of Chicago in the 1920s and 1930s. Sociologists Robert E. Park and Ernest W. Burgess drew analogies between human and nonhuman communities, describing society’s symbiotic and competitive relationships as an organic web. Biological concepts such as competition, commensalism, succession, and equilibrium were freely borrowed, mirroring the biologists’ use of social science concepts. Borrowing from contemporary plant ecologists and their focus on plant community zones, early human ecologists moved from classrooms to city streets to map “natural areas” or zones of the urban metropolis.

scholarly journals Complex interactions in legume/cereal intercropping system: role of root exudates in root-to-root communication

2017 ◽  
Author(s):  
Yinshan Jiao ◽  
Entao Wang ◽  
Wenfeng Chen ◽  
Donald L. Smith
Keyword(s):  
Nitrogen Fixation ◽  
Root Exudates ◽  
Faba Bean ◽  
The Novel ◽  
Practical Application ◽  
Corn Root ◽  
Complex Interactions ◽  
Root Interactions ◽  
Ecological Principles

Dear Editor,Legume/cereal intercropping systems have been regarded as the practical application of basic ecological principles such as diversity, competition and facilitation. In a recent PNAS paper, Li et al. (1) describe the novel finding that maize exudates promote faba bean nodulation and nitrogen fixation by upregulating genes involved in (iso)flavonoids synthesis (chalcone–flavanone isomerase) within faba bean, resulting in production of more genistein, a legume-to-rhizobia signal during establishment of the faba bean N2–fixing symbiosis. Although we salute the authors’ methodological efforts, there is another mechanism that could be responsible for the effect of corn root exudates on faba been nitrogen fixation observed in this article (1). The authors may misunderstand their data and the signalling role of maize exudates, thus got a defective model for the root interactions between faba bean and maize.

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