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The paper is devoted to modeling and optimization of reliable wireless mesh networks that employ directional antennas. We introduce two mixed-integer programming formulations that allow to simultaneously characterize routing patterns and transmission schedules. The first model allows for maximizing the minimal flow in a network. The second model involves reliability constraints and aims at minimiz
The greater cities’ outer transitional zones are ephemeral and dynamic. With Malmö (Sweden) as an example this paper discusses how coastal and agricultural landscapes in the urban fringe can develop into something new and closer to actual needs of the inhabitants. This is done by opening up for a use of new concepts when describing these areas, for example among planners/designers and exploiters.
Within cognitive science, two approaches currently dominate the problem of modeling representations. The symbolic approach views cognition as computation involving symbolic manipulation. Connectionism, a special case of associationism, models associations using artificial neuron networks. Peter Gardenfors offers his theory of conceptual representations as a bridge between the symbolic and connecti
Good health is crucial for human and economic development. In particular poor health in childhood seems to be of utmost concern since it causes irreversible damage and have implications later in life. Recent research suggests globalization is a strong force affecting adult and child health outcomes. Yet, there is much unexplained variation with respect to the globalization eect on child health, in
This book develops “Macroeconomic Uncertainty Strategy” (MUST) as a tool for coping with the impact of macroeconomic fluctuations on risk management, performance assessment, and strategies for value enhancement. The essential elements of a corporate strategy for managing uncertainty in the macroeconomic environment includes setting corporate objectives for risk management, measuring risk, choosing
The paper presents sufficient and almost necessary conditions for the presence of periodic solutions for zero dynamics of virtually constrained under-actuated Euler-Lagrange system. This result is further extended to detect periodic solutions for a class of hybrid systems in the plane and analyze their orbital stability and instability. Illustrative examples are given.
Semipermeable membrane devices (SPMDs) are passive samplers capable of concentrating hydrophobic chemicals from water, sediments, soil and air. They consist of layflat polymeric membrane such as polyethylene containing a thin film of synthetic lipid such as triolein. The transport of hydrophobic chemicals through the membrane into the lipid is governed by the process of passive diffusion. Therefor
Popular Abstract in Swedish Aerob kapacitet, i dagligt tal konditionen, är den maximala förmågan att utföra ett fysiskt arbete karaktäriserat av den maximala syreförbrukningen (V'O2max). Detta maximala arbete kan endast utföras en begränsad tid, till stor del beroende på en tilltagande anaerob metabolism, vilken bl.a. avspeglas som en ökning av utvädrat CO2 i lungorna. Längre tids arbete kan emellDifferent methods are proposed to assess the aerobic capacity. A novel scale, rating of perceived capacity (RPC) based on metabolic equivalents (METs) from 1 to 20, is presented. Selected MET values are linked to physical activities. Comparison of the rating with an exercise test in a group of women revealed that a correction based on age more accurately predicted the maximal exercise capacity. An
The finite element method has been used to analyse three topologies of iron-powder electrically magnetized synchronous machines. The first topology has the field winding placed in magnetically conducting end-plates, eliminating the need of slip-rings. In the second topology this is achieved by placing the winding above the outer rotor, and the third topology corresponds to the more conventional de
Popular Abstract in Swedish Etanol, dvs vanlig alkohol, från biomassa såsom energiskog, jordbruksavfallsrester och skogsavverkningsrester, är tänkt att användas som motorbränsle och ersätta fossila bränslen som bensin och diesel. Etanol är dyrare än bensin, men etanol är ett mera miljövänligt alternativ. Koldioxiden som bildas vid förbränningen av etanol tillverkad av biomassa ökar ej den totala kThe fermentative performance of bacteria, yeasts, and filamentous fungi was investigated in a pentose (xylose)-rich lignocellulosic hydrolyzate. The filamentous fungus Fusarium oxysporum and the xylose-fermenting yeast Pichia stipitis were found to be very sensitive to the inhibiting hydrolyzate. Recombinant xylose-utilizing Saccharomyces cerevisiae showed very poor ethanol formation from xylose;
Högre utbildning och forskning är en av de samhällsarenor där kvinnors position radikalt har förändrats de senaste trettio åren. Kvinnor är inte länge en minoritet inom akademin i stort, samtidigt som män fortfarande dominerar på ledningspositioner och professorstjänster. Andra minoritiserade grupper har också uppnått en större närvaro och synlighet. Policy för jämställdhet och mångfald är ofta ce
Abstract Inducible plant responses to damage, i.e. inducible defence responses and compensatory growth responses, are theoretically examined in an evolutionary and ecological context. Inducible defences are generally considered to be beneficial under conditions of low risk of herbivory and when initial damage is moderate. This study indicate that under these circumstances, localized defence respon
