Predation and escaping from predation through hiding are two fundamental phenomena in ecology. The most common approach to reducing the chance of predation is to use a refuge. Here, we consider a three species fishery model system with prey refuge induced by a Holling type-II functional response. These three species of fish populations are named prey, middle predator, and top predator. Harvesting is employed in most fishery models to achieve both ecological and commercial benefits. Research proves that non-linear harvesting (Michaelis–Menten (...) type) returns more realistic outcomes. So, we have combined the Michaelis–Menten type of harvesting efforts for all populations. Uniform boundedness conditions for the solutions of the model are discussed. The existence conditions for possible equilibrium points with stability are presented. We explain the dynamical behavior at each equilibrium point through bifurcation analysis. The persistent criteria of the system are examined. Bionomic equilibrium and optimal harvesting control using Pontryagin’s maximum principle are calculated. For validation of the model in the real world, we have implemented this in the freshwater ecosystem of Lake Victoria. Extraction of native fish species and ecological balances are the foremost solicitude of Lake Victoria. We may resolve this concern partially by implementing prey refuge, since it may sustain the ecology of Lake Victoria, and therefore also its economical importance. Lake Victoria is acclaimed worldwide for the trade of fishing. Also, it provides the largest employment in east-central Africa and is beneficial to fishing equipment manufacturers. So, the bionomic equilibrium and harvesting control have significant applications in the fisheries. All the analytical studies are verified by numerical simulations. We have plotted phase portraits, bifurcation diagrams, Lyapunov exponents to explore the dynamics of the proposed model. (shrink)

In this paper, I explore the links between liberal political theory and the evaluative nature of medical classification, arguing for stronger recognition of those links in a liberal model of medical practice. All judgments of medical or psychiatric "dysfunction," I argue, are fundamentally evaluative, reflecting our collective willingness or reluctance to tolerate and/or accommodate the conditions in question. Illness, then, is "socially constructed." But the relativist worries that this loaded phrase evokes are unfounded; patients, doctors, and communities will agree in (...) the vast majority of cases about what counts as illness. Where they cannot come to agreement, however, we are faced with precisely the sort of dispute about values and ways of life that the institutions of the liberal state are designed to accommodate. I accordingly sketch a model of medical practice, based loosely on Jürgen Habermas's political theories, designed to maximize both our awareness and our understanding of these disputes. (shrink)

Biography of Jiddu Krishnamurti, 1895-1986, Indian philosopher.

Treatise with auto-commentary on Dvaita philosophy.

The civilizational turn in sociological theory is best understood as an attempt to do full justice to the autonomy of culture (against all versions of structural-functional theory) without conceding the issue to cultural determinism. Civilizational formations are based on combinations of cultural visions of the world with regulative frameworks of social life, but the relationship between the two levels is open to conflicting interpretations and strategic uses of them. Axial age civilizations open up new structural and historical dimensions of interaction (...) between cultural and social patterns, and are therefore central to the agenda of civilizational analysis. Among the later breakthroughs which draw on Axial sources, the emergence of modernity stands out as particularly important; the cultural and political program of modernity may be seen as a new and distinctive civilization, but it remains open to more or less formative influences from older civilizational legacies. (shrink)

Individual semiotic systems interpreting their environment are not well understood from the externalist approach typical of the scientific method. Science constructs probabilities describing large populations of systems, not individuals. The Umwelt, as the individually experienced/created aspects of the habitat aspect of its population’s ecological niche, is given an internalist understanding within the framework of the compositional hierarchy. Vagueness is an important aspect of the internalist condition. It is selectively reduced momentarily by creative choices that can have a Peircean semiotic formulation, (...) and which are often unpredictable externally, thereby appearing to be chance events. (shrink)

Abstract:S. N. Balagangadhara, Sarika Rao, Jakob De Roover, and Marianne Keppens One of the best-known aspects of Indian society is its "rigid caste system" and the "evil practices of untouchability." It is a truism today to say that Indian society is divided into four castes, which are not allowed to mix. Many Indian texts are brought forward as evidence of this understanding of Indian society. The ancient Indian text Mānavadharmaśāstra or "Laws of Manu" takes a central place in such accounts. (...) This is especially the case for its verses on varṇasankara, translated as "mixing of social classes" or "intermixture of castes." Given the important role these verses play in the understanding of Indian culture, society, and policymaking, it is crucial to translate them accurately. Using one verse in one text, this article focuses on the standard translation and deals both critically and constructively with the received view. (shrink)

A connection between Aristotle's syllogistic and the calculus of relations is investigated. Aristotle's and Gergonne's syllogistics are considered as some algebraic structures. It is proved that Gergonne's syllogistic is isomorphic to closed elements algebra of a proper approximation relation algebra. This isomorphism permits to evaluate Gergonne's syllogisms and also Aristotle's syllogisms, laws of conversion and relations in the "square of oppositions" by means of regular computations with Boolean matrices.