45,872 research outputs found
Symposium on participatory approaches to reservoir fisheries management: issues, challenges and policies. Dambulla, Sri Lanka, 04-06 Oct. 2004 Session I. Community-based fisheries management; experience in other countries: presentation on STREAM Vietnamâs experience
Established in early 2002, STREAM Vietnam has so far attained a number of good experiences and lessons in using participatory approaches for its work. The Country Office has been able to link to a wide range of stakeholders, and is working hard to build close relationships amongst them, so that institutional entities can better support
the livelihoods of poor aquatic resources users, and support disadvantaged groups of people to improve their living standards by themselves.
Reservoir fisheries and co-management are at early stage in Vietnam, but in certain places and industries co-management has brought about successful results by involving proactive participation of communities. Situated on the same continent and having many similarities, the interaction in agriculture and fisheries sector between Vietnam and Sri Lanka has brought the two countries closer. Being members of the STREAM family, there are great opportunities for exchange of experiences and lessons towards sustainable management of reservoir resources. (PDF has 11 pages.
Double-bounce domain-wall in Einstein-Yang-Mills-Scalar black holes
We find Einstein-Yang-Mills (EYM) black hole solutions endowed with massless
scalar hair in the presence of a potential as function
of the scalar field . Choosing constant (or zero)
sets the scalar field to vanish leaving us with the EYM black holes. Our class
of black hole solutions is new so that they do not asymptote in general to any
known limits. Particular case is given, however, which admits an asymptotically
anti de Sitter limit in dimensional spacetime. The role of the potential
in making double bounces (i.e. both a minimum and
maximum radii) on a Domain Wall (DW) universe is highlighted.Comment: 9 pages, 1 figure, final version for publication in EPJ
Tree enterprises and bankruptcy ventures: a game theoretic similarity due to a graph theoretic proof
In a tree enterprise, users reside at the nodes of the tree and their aim is to connect themselves, directly or indirectly, to the root of the tree. The construction costs of arcs of the tree are given by means of the arc-cost-function associated with the tree. Further the bankruptcy venture is described in terms of the estate of the bankrupt firm and the claims of the various creditors. The first objective of the paper is to provide conditions (on the claims and the surplus of the claims in the bankruptcy venture) which are sufficient and necessary for the bankruptcy venture to agree with some tree enterprise. It is established that the bankruptcy venture agrees with some tree enterprise if and only if the surplus of claims in the bankruptcy venture is at most the size of the second smallest claim (in the weak sense). For that purpose, both the tree enterprise as well as the bankruptcy venture are modelled as a cooperative game with transferable utility. Within the framework of cooperative game theory, the proof of the equivalence theorem concerning the tree enterprise game and the bankruptcy game, under the given circumstances, is based on graph-theoretic tools in a tree structure. As an adjunct to the proof of the equivalence theorem, the solution concept of the nucleolus for specific tree enterprises is determine
The First Steps with Alexia, the Average Lexicographic Value
The new value AL for balanced games is discussed, which is based on averaging of lexicographic maxima of the core.Exactifications of games play a special role to find interesting relations of AL with other solution concepts for various classes of games as convex games, big boss games, simplex games etc. Also exactifications are helpful to associate fully defined games to partially defined games and to develop solution concepts there.cooperative games;average lexicographic value;exact games;partially defined games
Design optimization of a slotless PM brushless motor with spiral wound laminations for rim driven thrusters
This paper discusses the analysis and design of a very thin slotless PM brushless motor whose stator laminations are manufactured from a single strip of steel that is edge wound into a spiral (like a âSlinkyâ) and then fitted over the windings that are preformed on the outside surface of a non-conducting former. Analytical and finite element analysis (FEA) are used to determine the constrained optimum dimensions of a motor used to drive a rim driven thruster in which the motor rotor is fitted onto the rim of the propeller and the stator is encapsulated in the thin Kort nozzle of the thruster. The paper describes the fabrication of a demonstrator motor and presents
experimental results to validate the theoretical calculations. Experimental motor performance esults are also reported and compared with those of a slotted motor that fits within the same
active radial dimensions as the slotless motor. The slotless motor, which has longer active length
and endwindings, and thicker magnets than the slotted motor, was found to be less efficient and
more expensive (prototype cost) than the slotted machine
Application of 2D hydroelasticity theory to investigate the failure of a containership
This paper focuses on the investigation carried out on the failure of the MSC Napoli using two-dimensional (2D) symmetric (i.e. vertical bending) hydroelasticity analysis. The aim of the investigation was to assess the influence of whipping-induced loads on the structural strength of this containership. Relevant structural, hydrostatic and operational data were provided. The calculations were carried out in head regular and long-crested irregular waves. Both cases included the effect of bottom slamming only. Global wave-induced loads were evaluated along the hull, focusing in particular in the vicinity of the engine room. The investigation showed that whipping, due to bottom slamming, is only important for severe seas. The investigation also showed that the keel stresses, in way of the engine room, can be as large as the keel stresses at amidships
Differentially Coherent Code Acquisition in the MIMO-Aided Multi-Carrier DS-CDMA Downlink
Both differentially coherent and non-coherent code acquisition schemes designed for the multiple-input multiple-output (MIMO)-aided multi-carrier (MC)-DS-CDMA downlink are analysed, when communicating over uncorrelated Rayleigh channels. The attainable mean acquisition time (MAT) performance is studied as a function of both the number of multiple transmit/multiple receive antennas and that of the number of subcarriers. It is demonstrated that in contrast to the expectations, when the number of multiple transmit antennas and/or that of the subcarriers is increased in both the differentially coherent and the non-coherent code acquisition scenarios, the achievable MAT deteriorates over the entire signal-to-interference plus noise ratio (SINR) per chip (Ec/Io) range considered, except for the scenario of single-carrier (SC)-DS-CDMA using P Œ 2 transmit antennas and R Œ 1 receive antenna. As expected, the degree of performance degradation depends upon the specific scheme and the Ec/Io ratio considered, although paradoxically, the correctly synchronised MIMO-aided system is capable of attaining its target bit error ratio performance at reduced SINR values
Iterative Code Acquisition for DS-UWB Downlink using Multiple-Component Decoders
Iterative code acquisition schemes employing beneficially chosen higher-order generator polynomials and multiple-component decoders are analysed in terms of the correct detection probability of the direct sequence-ultra-wideband (DS-UWB) downlink. The proposed technique can maintain high acquisition performance, while reducing associated complexity by up to 30%
Beyond "the Relationship between the Individual and Society": broadening and deepening relational thinking in group analysis
The question of âthe relationship between the individual and societyâ has troubled group analysis since its inception. This paper offers a reading of Foulkes that highlights the emergent, yet evanescent, psychosocial ontology in his writings, and argues for the development of a truly psychosocial group analysis, which moves beyond the individual/society dualism. It argues for a shift towards a language of relationality, and proposes new theoretical resources for such a move from relational sociology, relational psychoanalysis and the âmatrixial thinkingâ of Bracha Ettinger which would broaden and deepen group analytic understandings of relationality
Black p-Branes versus black holes in non-asymptotically flat Einstein-Yang-Mills theory
We present a class of non-asymptotically flat (NAF) charged black p-branes
(BpB) with p-compact dimensions in higher dimensional Einstein-Yang-Mills
theory. Asymptotically the NAF structure manifests itself as an anti-de-sitter
spacetime. We determine the total mass / energy enclosed in a thin-shell
located outside the event horizon. By comparing the entropies of BpB with those
of black holes in same dimensions we derive transition criteria between the two
types of black objects. Given certain conditions satisfied our analysis shows
that BpB can be considered excited states of black holes. An event horizon
versus charge square plot \ for the BpB reveals such a
transition where is related to the horizon radius of the black
hole (BH) both with the common charge Comment: 10 pages, 1 figure, updated version. Final version to be published in
EPJ
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