Feasibility of controlling nitrification in predenitrification plants using DO, pH and ORP sensors

Experimental studies were carried out on a bench-scale nitrogen removal system with a predenitrification configuration to gain insights into the spatial and temporal variations of DO, pH and ORP in such systems. It is demonstrated that these signals correlate strongly with the operational states of the system, and could therefore be used as system performance indicators. The DO concentration in the first aerobic zone, when receiving constant aeration, and the net pH change between the last and first aerobic zones display strong correlations with the influent ammonia concentration for the domestic wastewater used in this study. The pH profile along the aerobic zones gives good indication on the extent of nitrification. The experimental results also showed a good correlation between ORP values in the last aerobic zone and effluent ammonia and nitrate concentrations, provided that DO in this zone is controlled at a constant level. These results suggest that the DO, pH and ORP sensors could potentially be used as alternatives to the on-line nutrient sensors for the control of continuous systems. An idea of using a fuzzy inference system to make an integrated use of these signals for on-line aeration control is presented and demonstrated on the bench-scale system with promising results. The use of these sensors has to date only been demonstrated in intermittent systems, such as sequencing batch reactor systems.

Teaching economic philosophy: Economics, ethics and the search for the right maximand

Economic philosophy is not often taught, and is not necessarily easily taught. It involves enquiry into implicit assumptions within orthodox economics and within alternatives to it. It seeks to highlight why it is that some critics object that neoclassical economics is too atomistic, hedonistic, and rationalistic, or why others lament that there is much hidden metaphysics in Friedman and his Chicago School colleagues. It addresses the issue of whether - in a reversal of the view that economics is the imperialistic social science - significant philosophical assumptions have been silently but inescapably imported into orthodox economics. This paper seeks to facilitate the presentation of such material with illustrations selected from social economics, development economics, and critiques of utilitarianism.

A FORMAÇÃO DE CLUSTERS PARA PEQUENAS E MÉDIAS EMPRESAS E AS VANTAGENS LOGÍSTICAS NA REGIÃO DO GRANDE ABC PAULISTA

A busca por maior competitividade frente ao mercado cada vez mais concorrido, a perseguição pela maximização dos lucros nas organizações, e as maneiras para tornar as organizações mais eficientes são assuntos largamente debatidos em discussões nos ambientes empresariais e acadêmicos, áreas em que a administração é requerida para analisar o universo de possibilidades em busca dos objetivos acima. Principalmente sobre as pequenas e médias empresas (PME), os impactos dos custos decorrentes de falta de infraestruturas adequadas em transportes, movimentação de materiais e em logística em geral, tornam estas organizações menos competitivas. Uma das alternativas que deve ser apresentada é um agrupamento destas organizações em um mesmo espaço físico, os denominados clusters, a fim de compartilharem alguns destes custos, além de experiências para atingirem alguns ganhos também em escala. Na logística, existe a possibilidade de compartilhamento de diversos serviços, onde deverá ser identificada boa parte do potencial de ganho com este modelo, que é aplicado para diversos segmentos inclusive ao redor do mundo. Em especial no Brasil onde a carga tributária é elevada e muito complexa, quando se opta pelo modelo de cluster, haverá ganhos em escala inclusive na tributação fiscal das movimentações de mercadorias. Através do levantamento bibliográfico e a comparação de dados de diversos artigos e de instituições públicas e privadas, objetiva-se apresentar as vantagens das operações no modelo cluster, a possibilidade dos ganhos pelo cooperativismo existente nestes empreendimentos entre outras formas de benefícios possíveis na logística compartilhada pelas empresas do cluster, além de possíveis desvantagens e limitações. .  

A GESTÃO DE RECURSOS HUMANOS: PERFIL ESTRATÉGICO OU OPERACIONAL?

Este trabalho tem como objetivo examinar o estágio atual do processo de desenvolvimento da função de Recursos Humanos (RH) e se esses papéis, ainda requeridos ou já existentes, atendem às expectativas dos diversos estratos envolvidos, auxiliando na busca de melhores resultados para as empresas e os que nelas trabalham. Nesse contexto, baseou-se na premissa de que as crescentes alterações sócio-culturais e o constante avanço tecnológico experimentado no mundo, além das modificações das condições de vida, permeiam e alteram as condições de trabalho e expectativas de convivência entre as pessoas e suas organizações, exigindo que a função Recursos Humanos busque alternativas de ação para alinhar suas estratégias às das organizações onde atua e fazendo com que o sistema de gestão de pessoas seja fonte de vantagem competitiva sustentável. Buscou-se analisar se o que uma organização faz e como o faz é fator que a distingue das demais, se sua especialização e habilidades deixam-na mais capaz, se é essa capacidade que a torna essencialmente mais competente e técnica e se, nesse quadro, o posicionamento postural de Recursos Humanos é adequado. Também procurou analisar a atuação de diversos públicos de interesse, como os envolvidos nas atividades trabalhistas-sindicais e se os novos elementos da governança corporativa são definidores de atuação estratégica para os profissionais da área estudada. Dentro dos conceitos acima, verificaram-se teorias e fatos, além de pesquisa, que resumissem e explicassem o que se sabe sobre o objeto estudado, classificando-os e sistematizando-os conforme apresentados na realidade empírica e selecionando aqueles a serem estudados, na tentativa de buscar e prever novas caracterizações dos papéis desempenhados por Recursos Humanos, que melhor os clarifiquem. A análise dos levantamentos teóricos realizados reforçou a importância das vantagens competitivas para o sucesso empresarial e a necessidade de que pessoas de conhecimento tornem-se mais produtivas na busca dessas vantagens, além de constatar que essas pessoas devem estar preparadas para atuar em contextos exigentes e complexos e o alerta de que a atuação estratégica de RH é fundamental na solidificação desse novo perfil dos empregados. As diversas funções operacionais atribuídas a Recursos Humanos, entre elas a administração da infra-estrutura e o gerenciamento da contribuição dos funcionários, devem complementar-se, agora, com as chamadas funções estratégicas, geradoras de valor, destacando-se o auxílio na definição das estratégias empresariais e sua tradução em ações de transformação e mudança. Mais do que isso se verificou a crescente preocupação de autores em aliar os recentes conceitos de governança corporativa a essa função estratégica de Recursos Humanos.(AU)

O Trânsito Religioso e a Recomposição das Formas Religiosas na Igreja Evangélica Assembleia de Deus, Ministério São Bernardo do Campo

O campo religioso brasileiro apresenta, em sua configuração atual, uma formatação identitária extremamente diversa daquela observada em décadas anteriores. A partir dessa consideração, emerge uma problemática significativa - como compreender essas mudanças? Por que um cenário, antes extremamente resistente a transformações, agora se abre aos ventos modernizantes permitindo a recomposição de suas formas religiosas? Ora, a construção de novas identidades e a reordenação dos padrões religiosos podem ser compreendidas a partir do fenômeno do trânsito religioso, considerando ser possível iden-tificar na movimentação dos sujeitos uma dinâmica que estabelece alterações, tanto no caráter institucional e litúrgico dos grupos, bem como na vivência prática dos / das fiéis, promovendo inéditos e provisórios sistemas simbólicos. Diante da multiplicidade de oferta, os sujeitos apresentam uma mobilidade incessante num processo de ressignificação permanente, formando efêmeros mosaicos nos quais se distinguem múltiplas cores, formas, espaços, demandas, motivações, comportamentos, interesses, habitus, tradições, símbolos, disposições, estratégias, gostos e combinações. A partir dos postulados das Ciências da Religião, essa pesquisa propõe-se a analisar esse evento tendo como universo de observação a Igreja Evangélica Assembleia de Deus, Ministério São Bernardo do Campo. Objetiva demonstrar, mediante a interpretação do con-junto de dados obtidos em pesquisa de campo correlacionado com os fundamentos teóricos, a recomposição das formas religiosas institucionais e as novas identidades desenvolvidas pelos sujeitos a partir da mobilidade; estabelecer uma conexão entre os elementos indicadores da pesquisa e o fenômeno caracterizado para identificar quais são as motivações de gênero, classe, geracional e de etnia para o trânsito de homens e mulheres que circulam das mais diversas alternativas para esse grupo religioso e, considerando esse referencial, compreender como a instituição religiosa absorve esse fluxo de pessoas.

O PROCESSO EDUCACIONAL DA CULTURA INDÍGENA TICUNA NA REGIÃO DO ALTO SOLIMÕES

Esse trabalho busca analisar o sistema educacional na tribo Ticuna, localizada na região do Alto Solimões, estado do Amazonas, onde estou há 21 anos em contato permanente com os índios Ticuna. Com o passar dos anos tenho observado que a cada dia, e de forma mais intensa, a manutenção de sua cultura vem sofrendo com o processo de influência da cultura não índia. Nesse trabalho realiza-se um levantamento histórico referente à possível existência de duas correntes educacionais entre os professores Ticuna. Uma considera importante um ensino bilíngue, o estudo dos mitos e costumes para preservação da cultura; a outra acredita que é inócuo estudar os mitos e outros aspectos culturais, que podem ser apreendidos no dia a dia, defendem que os índios precisam de uma educação igual a dos não indígenas, para competir no mercado em condições de igualdade. Inicialmente propõe-se uma busca histórica sobre o processo educacional relacionado à cultura Ticuna fora da escola, procurando verificar as relações entre o que é transmitido pela escola e o que se evidencia no cotidiano Ticuna. Em seguida, realiza-se uma análise de como se processa a educação implantada no meio Ticuna sob o título Educação Indígena . Destacam-se os fatores que influenciaram a fundação da escola, sua localização e aspectos relacionados ao meio físico, econômico, social e cultural, bem como, o ambiente humano e de aprendizagem, dados esses que subsidiam o objetivo proposto para este trabalho. Procura-se verificar se a educação desenvolvida na escola indígena cumpre o papel de estar constantemente buscando alternativas para uma educação que seja apropriada à sobrevivência da cultura Ticuna, uma educação adequada à realidade cultural. A pesquisa baseia-se em levantamento de dados através de documentos, como também em entrevistas com lideranças, professores e idosos da Tribo Ticuna; também na observação direta, com anotações feitas em caderno de campo. O processo de assimilação e influência da cultura não índia predomina na região do Alto Solimões e tem esmagado a cultura Ticuna, fazendo com que muitos já não queiram mais pescar, caçar ou viver como produtores ou coletores. É necessário buscar alternativas educacionais para a escola indígena Ticuna, em uma educação que seja apropriada para a sobrevivência de sua cultura e ao mesmo tempo minimize o preconceito enfrentado por esse povo. As lideranças e professores Ticuna esperam que a escola ajude na preservação e valorização de sua cultura. O prejuízo causado à educação cultural dos índios Ticuna é grande, a maioria dos jovens e crianças não são conhecedores dos significados dos rituais religiosos, mitos, lendas e crenças. Muitas vezes sabem até realizar o ritual, mas parece mais uma imitação de gestos, que se desvincula do seu real sentido. Espera-se que ao final dessa pesquisa sejamos capazes de utilizar o material desenvolvido para reflexão e que ela talvez possa servir como ponto de partida para os professores Ticuna na elaboração de diretrizes e desenvolvimento de um novo paradigma educacional que valorize mais a cultura.

Organic reactions in ionic liquids:Gewald synthesis of 2-aminothiophenes catalyzed by ethylenediammonium diacetate

Ionic liquids based on 1-butyl-3-methylimidazolium tetrafluoroborate (BmimBF4) and 1-butyl-3-methylimidazolium hexafluorophosphate (BmimPF6) were used as reusable alternatives to volatile organic solvents (VOCs) for ethylenediammonium diacetate (EDDA) catalyzed Gewald synthesis of 2-aminothiophenes. Significant rate enhancement and improvement of the yield were observed. The ionic liquids containing catalyst EDDA were recycled several times with no decreases in yields and reaction rates.

Organic reactions in ionic liquids: Knoevenagel condensation catalyzed by ethylenediammonium diacetate

The moisture and air stable ionic liquids 1-butyl-3-methylimidazonium tetrafluoroborate [bmim]BF4 and 1-butyl-3-methylimidazonium hexafluorophosphate [bmim]PF6 were used as ‘green' recyclable alternatives to volatile organic solvents (VOCs) for ethylenediammonium diacetate (EDDA) catalyzed Knoevenagel condensation between aldehydes or ketones with active methylene compounds. Both aldehydes and ketones gave satisfactory results. The ionic liquids containing catalyst EDDA were recycled several times with no decreases in yields and reaction rates. In the case of 2-hydroxybenzaldehyde, the reactions led to the formation of 3-substituted coumarins under standard reaction conditions.

Evaluating the motives of informal entrepreneurs: some lessons from Ukraine

To understand entrepreneurs' motivations, it has become increasingly common to distinguish between those driven by necessity (or pushed) and those driven by opportunity (or pulled) into entrepreneurship. Until now, entrepreneurs operating wholly or partially in the informal economy have been widely assumed to be necessity-driven, pushed into this enterprise as a survival strategy in the absence of alternatives. To evaluate whether this is indeed the case, this paper reports one of the first surveys of informal entrepreneurs' motives. Reporting face-to-face interviews conducted in Ukraine during 2005–06 with 298 informal entrepreneurs, the finding is although most identified themselves as necessity entrepreneurs when initially asked whether they were either pushed or pulled, subsequent questions reveal in the vast majority of cases, there were not only both push and pull factors driving their original decision to start-up informal enterprises, but also a clear shift among these entrepreneurs as their business became established away from necessity-oriented motivations and toward more opportunity-oriented motivations. The outcome is a call for a transcendence of a static either/or approach and the adoption of a dynamic both/and approach that recognizes the coexistence of necessity- and opportunity-drivers as well as the fluidity of entrepreneurs' motivations.

A structural method for the design of fault tolerant distributed control systems

Distributed digital control systems provide alternatives to conventional, centralised digital control systems. Typically, a modern distributed control system will comprise a multi-processor or network of processors, a communications network, an associated set of sensors and actuators, and the systems and applications software. This thesis addresses the problem of how to design robust decentralised control systems, such as those used to control event-driven, real-time processes in time-critical environments. Emphasis is placed on studying the dynamical behaviour of a system and identifying ways of partitioning the system so that it may be controlled in a distributed manner. A structural partitioning technique is adopted which makes use of natural physical sub-processes in the system, which are then mapped into the software processes to control the system. However, communications are required between the processes because of the disjoint nature of the distributed (i.e. partitioned) state of the physical system. The structural partitioning technique, and recent developments in the theory of potential controllability and observability of a system, are the basis for the design of controllers. In particular, the method is used to derive a decentralised estimate of the state vector for a continuous-time system. The work is also extended to derive a distributed estimate for a discrete-time system. Emphasis is also given to the role of communications in the distributed control of processes and to the partitioning technique necessary to design distributed and decentralised systems with resilient structures. A method is presented for the systematic identification of necessary communications for distributed control. It is also shwon that the structural partitions can be used directly in the design of software fault tolerant concurrent controllers. In particular, the structural partition can be used to identify the boundary of the conversation which can be used to protect a specific part of the system. In addition, for certain classes of system, the partitions can be used to identify processes which may be dynamically reconfigured in the event of a fault. These methods should be of use in the design of robust distributed systems.

The acceptability of alcohol fuels for automobile engines

The aim of this project was to carry out an investigastion into suitable alternatives to gasoline for use in modern automobiles. The fuel would provide the western world with a means of extending the natural gasoline resources and the third world a way of cutting down their dependence on the oil producing countries for their energy supply. Alcohols, namely methanol and ethanol, provide this solution. They can be used as gasoline extenders or as fuels on their own.In order to fulfil the aims of the project a literature study was carried out to investigate methods and costs of producing these fuels. An experimental programme was then set up in which the performance of the alcohols was studied on a conventional engine. The engine used for this purpose was the Fiat 127 930cc four cylinder engine. This engine was used because of its popularity in the European countries. The Weber fixed jet carburettor, since it was designed to be used with gasoline, was adapted so that the alcohol fuels and the blends could be used in the most efficient way. This was mainly to take account of the lower heat content of the alcohols. The adaptation of the carburettor was in the form of enlarging the main metering jet. Allowances for the alcohol's lower specfic gravity were made during fuel metering.Owing to the low front end volatility of methanol and ethanol, it was expected that `start up' problems would occur. An experimental programme was set up to determine the temperature range for a minimum required percentage `take off' that would ease start-up since it was determined that a `take off' of about 5% v/v liquid in the vapour phase would be sufficient for starting. Additions such as iso-pentane and n-pentane were used to improve the front end volatility. This proved to be successful.The lower heat content of the alcohol fuels also meant that a greater charge of fuel would be required. This was seen to pose further problems with fuel distribution from the carburettor to the individual cylinders on a multicylinder engine. Since it was not possible to modify the existing manifold on the Fiat 127 engine, experimental tests on manifold geometry were carried out using the Ricardo E6 single cylinder variable compression engine. Results from these tests showed that the length, shape and cross-sectional area of the manifold play an important part in the distribution of the fuel entering the cylinder, ie. vapour phase, vapour/small liquid droplet/liquid film phase, vapour/large liquid droplet/liquid film phase etc.The solvent properties of the alcohols and their greater electrical conductivity suggested that the materials used on the engine would be prone to chemical attack. In order to determine the type and rate of chemical attack, an experimental programme was set up whereby carburettor and other components were immersed in the alcohols and in blends of alcohol with gasoline. The test fuels were aerated and in some instances kept at temperatures ranging from 50oC to 90oC. Results from these tests suggest that not all materials used in the conventional engine are equally suitable for use with alcohols and alcohol/gasoline blends. Aluminium for instance was severely attacked by methanol causing pitting and pin-holing in the surface.In general this whole experimental programme gave valuable information on the acceptability of substitute fuels. While the long term effects of alcohol use merit further study, it is clear that methanol and ethanol will be increasingly used in place of gasoline.

A new strategy for selecting and evaluating physical solvents for gas absorption

This work describes how the physical properties of a solvent affect the design variables of a physical gas absorption process. The role of every property in determining the capital and the running cost of a process has been specified. Direct mathematical relationships have been formulated between every item of capital or running cost and the properties which are related to that item. The accuracy of the equations formulated has been checked by comparing their outcome with some actual design data. A good agreement has been found. The equations formulated may be used to evaluate on the basis of economics any suggested new solvents. A group of solvents were selected for evaluation. Their physical properties were estimated or collected as experimental data. The selected ones include three important solvents, the first is polyethylene glycol dimethyl ether (Selexol) which represents the currently most successful one, The other two solvents are acetonyl acetone (B2) and n-formyl morpholine which have been suggested previously as potential credible alternatives to the current ones. The important characteristics of: acetonyl acetone are its high solubility and its low viscosity, while the n-formyl morpholine is characterised by its low vapour pressure and its high selectivity. It was found that acetonyl acetone (B2) is the most attractive solvent for commercial applications particularly for process configurations that:include heat exchangers and strippers. The effect of the process configuration on the selected solvent was investigated in detail and it was found that there is no universal solvent which is the best for any process configuration, but that there is a best solvent for a given process configuration. In previous work, acetonyl acetone was suggested as a commercially promising physical solvent. That suggestion was not fully based on experimental measurement of all the physical properties. The viscosity of acetonyl acetone and its solubility at 1 atm were measured but the vapour pressure and the solubility of C02 and CH4 at high pressure were predicted. In this work, the solubilities of C02, CH4 and C3H8 in acetenyl acetone were measured for a partial pressure range of (2 ~ 22) bar at 25°C, The vapour pressure of this solvent was also measured, and the Antoine equation was formulated from tbe experimental data. The experimental data were found to be not In agreement with the predicted ones, so acetonyl acetone was re-evaluated according to the experimental data. It was found that this solvent can be recommended for further trials in a pilot plant study or for small scale commercial units.

An evaluation of thermal plasmas in pyrometallurgy

The development of reliable, high powered plasma generators has resulted in many plasma processes being proposed as alternatives to existing pyrometallurgical technologies. This work evaluates the advantages and disadvantages of plasma systems by reviewing plasma generators, their integration with reactors and the process economics. Many plasma systems were shown to be technically and economically superior to existing technologies, but some of the plasma system advantages quoted in the literature were found to be impractical because of other system constraints. Process applications were limited by the power inputs available from plasma generators compared to AC electric furnaces. A series of trials were conducted where chromite and steelplant baghouse dusts were smelted in the Tetronics' 2.0 MW transferred arc/open bath reactor to confirm the operating characteristics of the plasma system and its economics. Chromite smelting was technical superior to submerged arc furnace technology, but the economics were unfavourable because of the limited power available from the water-cooled plasma torch and the high electrical energy consumption. A DC graphite electrode plasma furnace using preheated and prereduced chromite concentrates will compete economically with the submerged arc furnace. Ni, Cr and Mo were economically recovered from high alloy content steelplant dusts for recycling. Five Electric Arc Furnace dusts were smelted to produce a non-toxic residue and recover the contained zinc to an enriched zinc oxide product for recycling. It should be possible to condense the zinc vapour directly in a zinc splash condenser to increase the value of the product. Because of the limited power available from plasma generators, plasma processes will be most suitable for treating high and medium value materials such as Au, Pt, Mo, Ni, Ti, V, Cr etc at small production rates, heating metals in tundishes and ladles and remelting superalloy scrap. The treatment of environmentally hazardous waste materials is a particularly interesting application because of the additional financial incentives. Non-transferred arc plasma generators will be used for air and gas preheating in blast furnaces to reduce metallurgical coke consumptions.

Cracking capitalist realism: the new student movement and its post-capitalist politics

There is much talk of =the crisis‘ in higher education, often expressed in fatalistic narratives about the (im)possibility of critical resistance or alternatives to the deepening domination of neoliberal rationality and capitalist power throughout social life. But how precisely are we to make sense of this situation? In what ways is it experienced? And what knowledges and practices may help us to respond? These questions form the basis for a series of explorations of the history and character of this crisis, the particular historical conjuncture that we occupy today, and the different types of theoretical analysis and political response it seems to be engendering. Our talk will explore the tensions between readings of the situation as a paralyzing experience of domination, loss and impossibility, on the one hand, and radical transformation and the opening of future possibilities, on the other. We will finally consider what implications new forms of political theory being created in the new student movements have for reconceptualising praxis in higher education today, and perhaps for a wider imagination of post-capitalist politics.

Evolving forms of manufacturing strategy development:evidence and implications

This paper outlines, using evidence from several case studies, the use of alternative forms of manufacturing strategy processes. Our investigation shows that the manufacturing strategy development practices of manufacturers are evolving in many directions; we found several alternatives to the formal top-down planning process. Manufacturers use one or more of the following alternatives with or without the top-down manufacturing strategy process: a coherent pattern of actions; manufacturing/process improvement programs; or the pursuit of core manufacturing capabilities. It appears that the various manufacturing strategy development processes may be tied to the strategic role of manufacturing in a company. This paper offers a framework that captures the relationship between the strategic role of manufacturing and the process of manufacturing strategy development. An in-depth case from a UK company illustrates the evolving forms of manufacturing strategy development processes.