49,909 research outputs found
Manuscript contexts and the transmission of the Agnus Castus herbal in MS Sloane 3160
MS Sloane 3160 is a miscellaneous volume containing one copy of the herbal Agnus Castus in Middle English. Traditionally, editions focused on texts in isolation and did not look in detail to the rest of the material, diminishing the potential of manuscript contexts in explaining how texts flow and are received by a specific audience. If we consider these groupings of texts a collective product in which all the co-texts are part of an internal dialogue, the importance of looking at the whole volume from a collective perspective becomes paramount in understanding the final aim of the compiler, and the processes of transmission of text and/or texts. The objective of this article has been to study the arrangement of the material contained in MS Sloane 3160 as a starting point to frame future comparison with manuscripts containing the same herbal. The results point to the identification of patterns which would confirm the “anthologistic impulse” (Lerer 2000). The structure of this manuscript would contain a spectrum of the most important areas that would cover the contents of a typical vademecum of the time, including religious texts, but more studies are needed in order to be able to assess these contexts in medical miscellanies. The impact and transmission of the Agnus Castus herbal needs to be studied collectively, and assessing the manuscript contexts in which the text is naturally embedded points to the right direction in understanding all the processes therein
The Development of Legislation on the Social Economy in Continental Western Europe
One of the main instruments for local development is the regulatory legal framework of the so-called Social Economy, a term and concept that is yet to be fully defined. The society’s approach to the generation of wealth encompasses different concepts, movements, approaches, and ways of acting, all of which pose a challenge to the determination of a precise definition. Within the European Union (E.U.), a common legislative base has been developed, although the specific legislation developed by each Member State has been uneven. The legislation may have started from the same common principles, but each country has adopted different legal forms. This work aims to outline the diverse ways of legislating on a concept that is still under construction and within similar legal frameworks, illustrating the lack of harmony between European states that, despite the sharing of borders and having common legislative foundations, distance themselves in the final legislation, a situation that does not benefit the economic unity of entrepreneurs with social principles
Rigidity and flexibility of surface groups
The aim of this work is the °exibility of the hyperbolic surfaces. The results
are about °exibility and geometrical boundedness. Bers are stated the universal
property for all hyperbolic surface of ÂŻnite area where introduced the constant of
boundedness. We determine this constant, using symbolic dynamics
The first eigenvalue of the Laplacian and the Conductance of a Compact surface
We present some results with the central theme of is the phenomenon of the first eigenvalue of the Laplacian and
conductance of the dynamical system. Our main tool is a method for studying how the hyperbolic metric on a Riemann surface
behaves under deformation of the surface. With this model, we show variation of the first eigenvalue of the laplacian and the
conductance of the dynamical system, with the Fenchel–Nielsen coordinates, that characterize the surface
Geodesic length spectrum on compact Riemann surfaces
In this paper we use techniques linking combinatorial structures (symbolic dynamics)
and algebraic-geometric structures to study the variation of the geodesic
length spectrum, with the Fenchel-Nielsen coordinates, which parametrize the surface
of genus Ď„ = 2. We explicitly compute length spectra, for all closed orientable
hyperbolic genus two surfaces, identifying the exponential growth rate and the first
terms of growth series
Iterative nonlinear model predictive control of a PH reactor. A comparative analysis
IFAC WORLD CONGRESS (16) (16.2005.PRAGA, REPĂšBLICA CHECA)This paper describes the control of a batch pH reactor by a nonlinear predictive controller that improves performance by using data of past batches. The control strategy combines the feedback features of a nonlinear predictive controller with the learning capabilities of run-to-run control.
The inclusion of real-time data collected during the on-going batch run in addition to those from the past runs make the control strategy capable not only of eliminating repeated errors but also of responding to new disturbances that occur during the run. The paper uses these ideas to devise an integrated controller that increases the capabilities of Nonlinear Model Predictive Control (NMPC) with batch-wise learning. This controller tries to improve existing strategies by the use of a nonlinear controller devised along the last-run trajectory as well as by the inclusion of filters.
A comparison with a similar controller based upon a linear model is performed. Simulation results are presented in order to illustrate performance improvements that can be achieved by the new method over the conventional iterative controllers. Although the controller is designed for discrete-time systems, it can be applied to stable continuous plants after discretization
Iterative Nonlinear Control of a Semibatch Reactor. Stability Analysis
This paper presents the application of Iterative
Nonlinear Model Predictive Control, INMPC, to a semibatch
chemical reactor. The proposed control approach is derived
from a model-based predictive control formulation which takes
advantage of the repetitive nature of batch processes. The
proposed controller combines the good qualities of Model
Predictive Control (MPC) with the possibility of learning from
past batches, that is the base of Iterative Control. It uses a
nonlinear model and a quadratic objective function that is
optimized in order to obtain the control law. A stability proof
with unitary control horizon is given for nonlinear plants that
are affine in control and have linear output map.
The controller shows capabilities to learn the optimal trajectory after a few iterations, giving a better fit than a linear
non-iterative MPC controller. The controller has applications in
repetitive disturbance rejection, because they do not modify
the model for control purposes. In this application, some
experiments with a disturbance in inlet water temperature has
been performed, getting good results.Ministerio de Ciencia y TecnologĂa DPI2004-07444-C04-0
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