Exploring applicability of the workload control concept

To be successful in companies, a production planning and control (PPC) concept should fit to the production environment. Essential elements of the concept should correspond with the characteristics of the production system. For classical concepts such as MRP these elements have become common sense. For example BOMexplosion and constant lead times make MRP known to perform best in environments with high material and low capacity complexity. For many other concepts the situation is less clear. In this paper the Workload Control (WLC) concept is considered for which the requirements for a successful application have never been investigated. A framework is proposed to explore the applicability of WLC in small- to medium-sized make-to-order (MTO) companies. It supports an initial consideration of WLC in the first phase of a PPC selection and implementation process. As a first step in developing the framework the inherent characteristics of the WLC concept and the relevant MTO production characteristics are identified. Confronting the indicators of the company characteristics with the WLC elements results in bestfit indications for the WLC concept. Contrarily to other PPC evaluation schemes the framework considers variability indicators besides averages. Use of this framework for a medium sized MTO company demonstrates its suitability in getting a systematic and quick impression of the applicability of WLC. Essential elements are treated and assessed.

Workload control concepts in job shops: a critical assessment

The paper considers a (static) portfolio system that satisfies adding-up contraints and the gross substitution theorem. The paper shows the relationship of the two conditions to the weak dominant diagonal property of the matrix of interest rate elasticities. This enables to investigate the impact of simultaneous changes in interest rates on the asset demands.

Studies in the chemistry of ergosterol

Imperial Users onl

Flow electrification of liquids in rectangular channels - Comparison of different theoretical models

This paper deals with flow electrification phenomenon of liquids in channels of rectangular cross section. Different theoretical models are described and compared. For all the models, it is assumed that the flow and the diffuse layer are fully developed. The space charge density conveyed by the flow is computed. First, two cases are examined in the case of weak space charge density, the exact rectangular channel solution is compared with the approximate solution of two parallel planes. This comparison shows a rather small difference between the two models. Then, in the case of two parallel planes assumption, the charge conveyed is computed without any hypothesis on the magnitude of the space charge density and compared to the solution obtained for a weak space charge density commonly assumed. This comparison shows a big difference between the two models concerning the determination of the space charge density on the wall, and, therefore, the zeta potential [1].Fil: Cabaleiro, Juan Martin. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Ingeniería Mecánica. Laboratorio de Fluidodinámica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Paillat, Thierry. Université de Poitiers; FranciaFil: Artana, Guillermo Osvaldo. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Ingeniería Mecánica. Laboratorio de Fluidodinámica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Touchard, Gerard. Université de Poitiers; Franci

The Master of the Rebels: Teenage Encounters with Shakespeare, 1944-2012.

This dissertation tells the story of Shakespeare's role in the invention of the teenager and teenagers' roles in re-inventing Shakespeare. In post World War II England, Australia, and the United States, Shakespeare's plays became one arena where competing versions of teenage identity were defined, with Shakespearean characters and teenage subjects cast as rebels or romantic consumers. I argue that a narrow canon of School Shakespeare has emerged, with Hamlet and Romeo and Juliet recast as plays about romantic consumption, limiting the political roles of teenagers to onlookers rather than rebellious actors. Attending to what I term double reply, I contend that teenagers can resist their interpellation as romantic consumers, carving a powerful alternative discourse through parody and non-verbal performance

Conflict of norms in European Union law and the legal reasoning of the European Court of Justice

This thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.This thesis examines the topic of conflict of norms in European Union (EU) law and the legal reasoning of the European Court of Justice (ECJ), arguing that the framework of conflict of norms provides conceptual insight into justification and the role of value choices in legal reasoning. After examining the theory of conflict of norms, which seems to have been relatively under-studied generally and especially in EU law, it examines three particular aspects of norm conflict resolution in the legal reasoning of the ECJ and EU law: conflict of interpretative norms, especially the opposition between conserving and innovative interpretation; conflicts of human rights norms, looking in particular at the idea of a hierarchy of rights and of specificationism in the articulation of rights; and conflicts of competence norms. It concludes that the scope exists for a fuller justification of the choice of norms in the legal reasoning of the ECJ and generally in EU law and offers a perspective on how the values articulated by the EU suggest particular approaches to norm conflict resolution by the ECJ in its decision-making in these fields, in particular, a greater resort to lex specialis and originalist or historical interpretation, in contrast to its current method.Department of Education and Learning of Northern Ireland (2005-2008); Scholarship from the Modern Law Review (2006-2008); Waiver of fees by Brunel Universit

From Dismal Swamp to Smiling Farms: Socio-Ecological Change and Making Food in the Holland Marsh

In the early 1920s a three thousand hectare area of the Holland River lowlands, 60 kilometers north of Toronto, Ontario, was canalized, drained and transformed into fields. In the contemporary period, wetlands are places to protect not dredge, drain and farm. Yet in the 1920s support for the conversion of the Holland Marsh was virtually unanimous. Indeed in 1920 not converting the wetland to farmland would have been considered reckless. The pages that follow excavate the complex social, political, biophysical, and cultural processes that account for this significant divergence in ideas about, and uses of, land. Through a chronological environmental history of the area, important historical conjunctures and constellations of institutions, ideologies and technologies responsible for driving landscape change and the production of nature in the Holland Marsh are highlighted. Conceptually, I problematize the idea that the agricultural landscape is natural by drawing on Neil Smiths (2008 [1984]) provocative production of nature thesis. I combine this with more traditional political economic and political ecological approaches to the study of food agriculture in order to elaborate and extend Smiths work. I demonstrate that the context of natures production the actors, institutions, locale, history and politics both facilitate and impinge upon the production of nature

Preliminary design of the full-Stokes UV and visible spectropolarimeter for UVMag/Arago

The UVMag consortium proposed the space mission project Arago to ESA at its M4 call. It is dedicated to the study of the dynamic 3D environment of stars and planets. This space mission will be equipped with a high-resolution spectropolarimeter working from 119 to 888 nm. A preliminary optical design of the whole instrument has been prepared and is presented here. The design consists of the telescope, the instrument itself, and the focusing optics. Considering not only the scientific requirements, but also the cost and size constraints to fit a M-size mission, the telescope has a 1.3 m diameter primary mirror and is a classical Cassegrain-type telescope that allows a polarization-free focus. The polarimeter is placed at this Cassegrain focus. This is the key element of the mission and the most challenging to be designed. The main challenge lies in the huge spectral range offered by the instrument; the polarimeter has to deliver the full Stokes vector with a high precision from the FUV (119 nm) to the NIR (888 nm). The polarimeter module is then followed by a high-resolution echelle-spectrometer achieving a resolution of 35000 in the visible range and 25000 in the UV. The two channels are separated after the echelle grating, allowing a specific cross-dispersion and focusing optics for the UV and visible ranges. Considering the large field of view and the high numerical aperture, the focusing optic for both the UV and visible channels is a Three-Mirror-Anastigmat (TMA) telescope, in order to focus the various wavelengths and many orders onto the detectors.Comment: 6 pages, 6 figures, IAUS 30