Diss. Ph. D.--Faculty of arts and sciences--University of Pittsburgh, 1990. / Bibliogr. f. 368-393. Verso des feuillets blanc.

Made available in DSpace on 2014-06-11T19:31:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2004-12-17Bitstream added on 2014-06-13T19:20:47Z : No. of bitstreams: 1 silvajunior_an_dr_botfca.pdf: 2640495 bytes, checksum: 5a1cf7d0c2044aa88eae209e5eb130e8 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Universidade Estadual Paulista (UNESP) / O presente trabalho teve por objetivo determinar o potencial de economia de energia elétrica nos sistemas de aeração de silos verticais a partir da implementação de controle eletrônico de velocidade do motor do aerador utilizando inversor de freqüência. O experimento foi montado no setor de armazenamento de grãos da empresa Indústria de Produtos Dallas Ltda, na cidade de Nova Alvorada do Sul (MS), no período de 25/03/04 a 22/10/04, sendo utilizados dois silos contendo, cada um, 5.000m3 de soja a 13,5% de umidade, aqui denominados silo 11 e silo 12. O sistema de aeração, em ambos os silos, era composto por um motor de indução com as especificações de 30cv, 4 polos, 380V, 60Hz, 1.765rpm, e ventilador com rotor de pás retas, inclinadas para trás, com característica de consumo de energia elétrica constante para uma mesma velocidade de rotação. O silo 11 foi definido como silo padrão e o aerador funcionou em 60Hz (1.765rpm) durante todo o período do experimento. O aerador do silo 12, cuja implementação de controle de velocidade foi efetuada por um inversor de freqüência, esteve ajustado para funcionamento em quatro estágios, 48Hz (1.405rpm), 45Hz (1.315rpm), 40Hz (1.165rpm) e 35Hz (1.015rpm). O parâmetro utilizado para a definição da freqüência (rotação) de cada estágio foi a vazão específica básica de ar (0,08m3/min.m3), recomendada pela Kleper Weber Industrial para aeração em silos planos e elevados, para grãos comerciais com umidade de até 14%. Os dados de temperatura no interior dos silos e os de temperatura e umidade do ar externo foram coletados através de sensores que alimentavam software de gerenciamento e controle automático de aeração existente na empresa e que,... / This work had the objective of determining the potential of economy of electric energy in the aeration systems of vertical silos through the implementation of electronic control of speed in the aerator engine, using a frequency inverter. The experiment was carried out in the grain storage sector at Produtos Dallas Ltda in Nova Alvorada do Sul (MS) in the period of 25/03/04 and 22/10/04. Two silos have been used, each one with 5.000 m3 of soy bean with 13.3 of humidity, named silo 11 and silo 12. The aeration system in both silos was composed of an induction engine with the specifications of 30cv, 4 poles, 380V, 60Hz, 1765 rpm, and of a ventilator with the following characteristics: a straight-shafted rotor, the shafts inclined backwards and a steady consumption of electric energy for the same rotation speed. Silo 11 was defined as the pattern silo and the aerator worked at 60Hz (1765 rpm) during the whole period of the experiment. The aerator of silo 12, whose implementation of speed control was made by a frequency inverter, was adjusted to work in four stages: 48Hz (1.405rpm), 45Hz (1.315rpm), 40Hz (1.165rpm) and 35Hz (1.015rpm). The parameter used to define frequency (rotation) of each stage was the basic specific air release (0,08m3 of air/min/m3grains), recommended by Kleper Weber Industrial for aeration in plain vertical silos, for commercial grains with humidity up to 14%. The data concerning the temperature inside the silos, the external temperature and the air humidity were collected through the sensors that fed the management software existing in the factory that, in turn, controlled automatically the aeration and, following a pre-arranged programming, determined the time to turn on/turn off the aerators. Considering the rotation of the aerators in each stage of frequency and making use of the software MAEV-2000,...(Complete abstract, click electronic access below)

The increasing pressures on the global eco-system have reached a critical stage. Cities are the center of most pressures on the biosphere and the contribution to unsustainability. Examined critically, the Sustainable Initiatives addressing urban challenges tend to act independently from each other. This situation is called the Silo-Effect, which is the state of isolation of Sustainability Initiatives in the city arena. The Silo-Effect results in a situation where the Initiatives‘ use of time, energy, and resources is not optimal, therefore creating less effective impact towards urban sustainability. The purpose of this research is to suggest solutions to the Silo-Effect by asking the question, What are the components needed to support the cohesion of Sustainable Initiatives across silos in the city? The methodology of grounded theory inspired the data collection and analysis process of thirteen interviews with professionals from the field. Results confirmed the existence of the Silo-Effect and revealed the main components supporting Cohesion Across Silos. Emerging insights include the need to 1) create Supportive Structures that will maximize the abundant social, human, cultural and economic capitals of practitioners, provide a shared space, and support collaboration, coordination and communications efforts between Initiatives, 2) create new models of local governance and funding systems that support cohesion, and 3) focus experimentation on the neighborhood scale to minimize complexity.

Item of diploma thesis is project of steel construction with 6 steel silos for storage the grain. The construction is situated inside hall. Silos are high 24 meter and diameter is 6 meter. The load-bearing steel structure for silos is designed in a variant solution. Silos are assessed by ČSN 73 5570 and ČSN EN 1991-4

This work elaborates the impacts of strategically constructed silos that are not byproducts of flagging cross-departmental cooperation or the cumulative effect of decades of decentralized command and control. Rather, these silos are strategically intended structures within organizations. Most significantly, the substantive theory of strategically constructed silos and their impact on customer service contributes to the field by illustrating the presence and consequence of silos occurring in suboptimal conditions. The existence of silos has implications that extend far beyond the retail area. A key take-away from this research is that contrary to how most customer service processes are designed, not all customer-company interactions are alike. As shown in the data, interaction types vary both in regard to the degree of knowledge needed by retail employees to fully serve customers, and the routine or nonroutine nature of the interaction. This is an important finding since it directly relates to whether the existence of a silo is appropriate (or optimal) for a specific interaction or task. Additionally, the findings suggest the role that a task's "routine-ness" plays is secondary to the degree of specialized knowledge needed by retail employees to meet customer expectations. Understanding the various customer-company interaction types and how each interaction type may be affected by silos is crucial for designing customer experiences that will sustain over time. Likewise, identifying customer-company interaction types correctly and then subsequently developing strategies to support these interaction types is critical for both customer experience management (CEM) initiatives and customer relationship management (CRM) system design within the company. This work provides an overview of the implications of strategically constructed silos occurring in suboptimal conditions and provides recommendations for diagnosing customer-company interactions based on interaction type. By identifying strategically constructed silos as an intended structure of the company, the model elaborated here works to deliver prescriptive and specific strategies for managers and employees' use as they attempt to improve their firm's customer-company interaction outcomes.

Sustainable Development Goals (SDG) localization is a growing concept in environmentalgovernance, with a focus on transferring global goals to local governments. A process underlyinga decentralized and multi-governance approach by involving local stakeholders in the policycycle. According to recent studies, localization has the potential of accelerating Agenda 2030 inthree steps; awareness-raising, implementation, and monitoring. Yet, after more than two years ofliving in a global Covid-19 pandemic, societies have changed, and foremost politics. New policyinstruments (lockdowns, masks, social distancing), economic decline, and new political prioritieshave all emerged from the pandemic. The question remaining is: How has the pandemic affectedlocalization and ultimately Agenda 2030? What are the institutional changes deriving fromCovid-19? And is it a positive or negative development for achieving Agenda 2030?On the 9th of February, 2022, the national Covid-19 restrictions in Sweden were uplifted and theaim of this research is to analyze the research puzzle of localization and the pandemic byconducting ten in-depth interviews with policy-practitioners in Swedish municipalities. Theresearch will derive from a critical fantasy theory encapturing rule-following and social practicesamong the practitioners, the forces and factors contributing to the maintainence, reformation, andcontestation of political discourses. The “inside perspective” of SDG localization offered aglimpse of routinized social pracitices and political discourses characterized by politicaltraditionalism, departmental silos, and “island solutions”. New emerging governance innovationsshowcase a step towards E-governance and centralized models for cross-municipal cooperation.Ultimately, offering a glimpse of what the future of SDG localization in Sweden could look like

This thesis explores the consequences of neglect and lack of proper support and implementation in maintenance management models, specifically an old implementation of the Pm3 model. The area of study is not widely explored, with studies and evaluation of the specific model we have looked at being almost non-existent. We have conducted a qualitative case study at an IT department/company at a Swedish university and the data has been collected through interviews with different IT department leaders, as well as one interview with a representative with the company that owns and distributes the Pm3 model. The current software development methodology at the IT company studied in this thesis are agile methods but is locked down to a micro level, while the Pm3 model handles the macro level. The consequences of this are then compared against research within fields such as IT governance and IT/business alignment to find discrepancies from which the phenomena’s can be explained. With this thesis we want to explore the consequences of not maintaining maintenance management models in organizations, especially the Pm3 model as this is widely in Swedish institutions such as universities and government authorities. This thesis provides a word of caution and argue for the importance of maintenance in maintenance management models for such organizations.

The electrical industry is considered a high-risk industry, with workers constantly working in close relation to high voltages and in a workplace which constantly changes. This emphasizes the need for a proper safety management system, in order to identify and manage risk at each and every workplace. The aim of this study is to explore the safety management dynamics and interplay between management and workers in regard to safety in the electrical grid industry. This, with the purpose of identifying which deficiencies exist in the interaction, and how existing safety management theories can be applied in order to explain the deficiencies identified. This is done though a qualitative, single case study. The research method uses an abductive approach, and data is collected through both participant observations and semi-structured interviews with managers and workers in order to compare the difference in perception of the current safety management system at the studied organization. The result is analyzed using a thematic analysis, in which four different themes are found, communication, organizational culture, organizational dynamics, and safety practices. The study identifies flawed communication as an underlying issue which results in multiple following deficiencies. A lack of organizational transparency and inefficient communication methods, fuels a confusion regarding the purpose and efficiency of safety measures, and undermines the workers trust in management’s commitment to safety. Consequently, workers perceived organizational support decreases, as well as their willingness to engage in constructive voice behavior and following safety protocol. This gap in understanding between management and workers forms organizational silos between the two actors, where not only communication and collaboration further decrease, but also a social identity within the groups where the other side isn’t seen as a collaborator, but rather a hinderance. The study concludes that the deficiencies in the organizational communication has created a downward spiral, exacerbating the gap between management and workers, and hinders the safety management system. Addressing the deficiencies identified in this study, one should focus on enhancing communication, fostering a mutual trust, and actively promote and prioritize workers engagement to safety practices.

Minas Gerais possui o maior rebanho bovino leiteiro e é também o maior produtor de leite do Brasil. Neste estado, destaca-se o município de Patos de Minas, terceiro maior produtor de leite brasileiro. Dentre os alimentos volumosos utilizados em dietas de vacas leiteiras, a silagem de milho (Zea mays) tem se destacado, por apresentar boa produtividade, boa ensilabilidade, além de vários estudos que garantem o avanço tecnológico desta cultura, em comparação a outras plantas forrageiras. Porém, a maioria dos estudos sobre a cultura do milho para produção de silagem tem sido feitos em condição laboratorial, e poucos apresentam dados obtidos a campo. Considerando a importância do município na atividade leiteira e o impacto do volumoso nesta atividade, o objetivo com este estudo foi avaliar as silagens de milho e as práticas de manejo com as silagens utilizadas nas propriedades leiteiras do município de Patos de Minas, MG. Foram visitadas 31 propriedades leiteiras escolhidas aleatoriamente no município, onde foi aplicado um questionário com questões relacionadas à propriedade, ao processo de ensilagem e à utilização deste volumoso. Os silos foram medidos e o painel da silagem foi observado para constatar homogeneidade e camadas deterioradas. Foram coletadas amostras representativas das silagens para avaliação do teor de matéria seca e tamanho de partículas. Os silos foram dimensionados para cálculo da área de painel. Também foram aferidas as temperaturas médias dos silos. Foi realizada análise de cluster para fazer o agrupamento das propriedades avaliadas. As variáveis contínuas dos grupos de fazendas foram submetidas à análise de variância em delineamento inteiramente casualizado e as médias comparadas pelo teste de Tukey, enquanto que as médias das variáveis discretas foram comparadas pelo teste de qui-quadrado, com decorrência do erro tipo I. A temperatura média encontrada dentro dos silos das propriedades leiteiras de Patos de Minas, MG, são superiores à temperatura ambiente. As propriedades com baixa produção de leite são caracterizadas por ausência de consultoria técnica e tendem a apresentar painéis de silos desuniformes, com retirada manual, resultando em maior descarte (perda) de silagem. / Minas Gerais has the largest milk producer in Brazil. In this state, stands out the county of Patos de Minas, the third largest producer of Brazilian milk. Among the bulky foods used in diets of dairy cows, the corn silage (Zea mays) has been highlighted, due to its good productivity, good ensilability, besides several studies that guarantee the technological advance of the crop, compared to other forage plants. However, most of the studies on corn crop for silage production have been done in laboratory conditions, and few field data. Considering the value of the county in the milk activity and the impact of the silage on the activity, the objective of this study was evaluated the corn silages and as management practices with silages used in the dairy properties of the city of Patos de Minas, MG. A total of 31 randomly selected dairy farms were visited in the county, where was applied a quiz with questions related to ownership, the silage process and the use of this voluminous. The silos were measured and the silage panel was observed to verify homogeneity and deteriorated layers. Representative samples of the silages were collected to evaluate the dry matter content and particle size. Metric evaluations of the silos were done to calculate the panel area. The middle temperatures of the silos were also measured. The cluster analysis was performed to group the evaluated properties. The continuous variables of the farm groups were submitted to analysis of variance in a completely randomized design and the averages were compared by the Tukey test, while the means of the discrete variables were compared by the chi-square test, due to the type I error. The average temperature found within the silos of the dairy properties of Patos de Minas, MG, is higher than the ambient temperature. The properties with low milk production are characterized by lack of technical advice and tend to present panels of silos disuniforms, with manual withdrawal, resulting in greater discarding (loss) of silage. / Dissertação (Mestrado)

La presente investigación denominada “Propuesta de reducción del costo de despacho de cereales a granel” tiene el objetivo de determinar una propuesta de reducción del costo de despacho de cereales a granel de la empresa objeto de estudio. Se realizó un estudio de causa - efecto, análisis de datos cuantitativos y observaciones instantáneas para identificar la actividad donde se tiene un sobre costo en el servicio de despacho. Identificando como problemas los altos costos que significan las actividades de liberación de paneles y barredura de silos metálicos que se realizan de manera manual. Se presentó el estudio económico de dos propuestas de solución, de las cuales se optó que la mejor propuesta tiene una inversión que asciende a S/.232,700.49 nuevos soles; el cual será asumido al 100% por la misma empresa. La evaluación económica muestra un Valor Actual Neto (VAN) mayor a cero y una Tasa Interna de Retorno (TIR) mayor al costo de oportunidad del accionista por lo que se concluye que el proyecto genera valor y es económicamente viable, al implementar dicha propuesta las actividades de liberación de paneles y barredura de silos metálicos se realizaran de manera semiautomática. This research entitled "Proposal for reducing the cost of bulk grain exports" aims to determine a method for reducing the cost of bulk grain dispatch of the company under study. A cause and effect study was conducted using quantitative analysis of data and instant feedback to identify where the activity has a cost overrun on the dispatch service. As problems identifying significant than the high costs brought Activities Liberation panels and metal silo sweep carried out manually. An economic study of two proposed solutions, of which it was decided that the best proposal is an investment amounting to S/. 232,700.49 was presented; which shall be provided 100% by the same company. The economic assessment shows a higher Net Present Value (NPV) of zero and a Internal Rate of Return (IRR) greater than the opportunity cost of shareholders. Therefore, it is concluded that the project creates value and is economically feasible to implement this proposal, the proposal to implement activities and sweep release panels were held metal silo semi-automatically.