Thesis (M.Eng. (Development and Management Engineering)--North-West University, Potchefstroom Campus, 2008.

Thesis (M.Eng. (Development and Management Engineering)--North-West University, Potchefstroom Campus, 2008.

The work is focused on measuring corporate performance in particular one of the key factors influencing the financial results of the company, which is the volume of production and change. The aim is to assess how a change in production volume affects business performance of selected business entity.

The thesis is focus on means of tracking and cost management in selected farm company. The first part is devote to theoretical and methodological basis of costs and calculate the costs that are obtained from the literature and then applied to the farm company. Further thesis is focus on selected performances (rape, eggs), the development costs of these performances in each year and the application of their calculations that the farm company use and application of the calculation method, which in agriculture is not so common. Here I use microeconomic knowledge in decision making firms not only on the optimal output.

This thesis deals with the issue of investment decisions, which is important for every business. The aim of this thesis was to evaluate the effectiveness of selected investment project.First, we conducted a financial analysis to assess the current status of the company. Then we have identified the revenue and expenditure of the project. We also have assessed the effectiveness of investments in several variants. At the conclusion of the project was assessed risk.

Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2017-07-28T18:32:47Z No. of bitstreams: 1 2016 - Renata Ara?jo Dantass.pdf: 3354692 bytes, checksum: 1d9395453e1cd720f2bd08e346ef7ce7 (MD5) / Made available in DSpace on 2017-07-28T18:32:47Z (GMT). No. of bitstreams: 1 2016 - Renata Ara?jo Dantass.pdf: 3354692 bytes, checksum: 1d9395453e1cd720f2bd08e346ef7ce7 (MD5) Previous issue date: 2016-12-15 / The increasing economic and technological development over the world has caused a huge demand of energy. In Brazil, the transportation sector is the main responsible for energy consumption in the country, reaching 45.2% of the diesel use. In this scenario, renewable fuels become an attractive alternative due to the numerous benefits attributed to their use, such as degradability, absence of toxicity, reduction of pollutant emission and renewable origin. As in other countries, Brazil has authorized the use of a minimum quantity of biodiesel in diesel. Currently, according to federal law n? 11.097/2005, the minimum mixing percentage is equivalent to 7% and during 2016, it will increase to 8%. However, the major challenge to produce biodiesel in a large-scale is the high operating cost. According to the literature, the raw material costs are so high, and correspond to 70-85% of the total cost of production. The use of alternative and low cost sources of triglycerides for biodiesel production has been extensively studied. Waste oil, from domestic and commercial consumption, is a potential residue because of its high quantity available and low aggregated value. In this context, the production of biodiesel in a pilot unit present in the UFRRJ was studied using the homogeneous alkaline transesterification reaction. The operational condition used in the pilot plant was previously determined from an experimental planning, choosing the best one that gave the high conversion and acceptable values of viscosity. The simulations were performed in the SuperPro Designer?, and the prices of materials, utilities, consumables and costs with operators were determined based on the domestic and international market. A previous analysis of the production of 250 kg/batch of biodiesel was economically viable considering the unit cost of biodiesel of $ 0.62/kg. The sensitivity analysis showed that the plant becomes economically viable from a biodiesel price equal or greater than $ 0.754/kg, almost 34 cents above the initially estimated value. In order to turn the biodiesel production more profitable, simulations were done with different vegetable oils with different levels of costs. The results were unsatisfactory from the economic point of view, confirming the importance of the use of low cost raw materials. A scale up was made from the pilot unit and the technical and economic data showed that the project becomes more profitable starting from the production of 2.500 kg of residual oil, presenting IRR and return time of respectively 116.9 % and 1 year. The production of biodiesel in the pilot unit was carried out and the specifications were compared to ANP. The values of viscosity, specific mass, flash point, iodine content and corrosivity were in the limit range established by ANP. / O crescente desenvolvimento econ?mico e tecnol?gico associado ao aumento populacional tem provocado uma grande demanda de energia. No Brasil, atrav?s do Balan?o Energ?tico Nacional divulgado pelo Minist?rio de Minas e Energia, foi apontado que o setor de transporte foi o maior respons?vel pelo consumo de energia no pa?s, sendo a maior parte (45,2%) referente ao uso de ?leo diesel. Neste cen?rio, os combust?veis renov?veis tornam-se uma alternativa atraente devido aos in?meros benef?cios atribu?dos ao seu uso, como degradabilidade, aus?ncia de toxicidade, redu??o da emiss?o de poluentes e origem renov?vel. Assim como em outros pa?ses, o Brasil autorizou o uso de misturas m?nimas obrigat?rias de biodiesel ao diesel. Atualmente, de acordo com a lei federal n?. 11.097/2005, o percentual de mistura m?nima ? equivalente a 7% e, para o ano de 2016, foi aprovado o aumento para 8%. Entretanto, a maior barreira para produ??o e utiliza??o de biodiesel em larga escala ? o elevado custo operacional. De acordo com a literatura, o custo de aquisi??o da mat?ria prima ? o mais alto e corresponde entre 70- 85% do custo total de produ??o. O uso de fontes de triglicer?deos alternativas e menos dispendiosas para produ??o de biodiesel tem sido amplamente estudada. O ?leo residual, proveniente do consumo dom?stico e comercial, ? uma fonte em potencial devido a sua vasta abund?ncia e baixo valor agregado. Neste contexto, a produ??o de biodiesel em uma unidade piloto presente na UFRRJ foi estudada a partir da rea??o de transesterifica??o homog?nea b?sica. A condi??o operacional empregada na planta piloto foi previamente determinada a partir de um planejamento experimental, objetivando maior convers?o e menor gasto energ?tico e material. Com aux?lio de um simulador comercial, SuperPro Designer?, o balan?o de massa e energia foi realizado. Com base no mercado nacional e internacional, os pre?os de materiais, utilidades, consum?veis e custos com operadores foram determinados. Uma an?lise pr?via da produ??o de 250 kg/batelada de biodiesel, de acordo com as opera??es unit?rias presentes na planta original, apresentou-se invi?vel economicamente considerando o custo unit?rio de biodiesel de $0,62/kg. A an?lise de sensibilidade mostrou que a planta torna-se vi?vel economicamente a partir de um pre?o de venda do biodiesel igual ou superior a $0,754/kg, 34 centavos acima do valor inicialmente estimado. Simula??es da produ??o de biodiesel na unidade piloto com ?leos vegetais de diferentes custos de aquisi??o foram realizadas. Os resultados mostraram-se insatisfat?rios do ponto de vista econ?mico, ratificando a import?ncia do uso de mat?rias-primas de baixo valor agregado. Um ?scale up? foi feito a partir da unidade piloto e os dados t?cnicos e econ?micos mostraram que o projeto torna-se mais lucrativo partindo da produ??o de 2.500 kg de ?leo residual, apresentando TIR e tempo de retorno de, respectivamente, 116,9% e 1 ano. A produ??o de biodiesel na unidade piloto foi realizada e o biodiesel produzido foi analisado e comparado quanto ?s especifica??es da ANP. Os valores de viscosidade cinem?tica, massa espec?fica, ponto de fulgor, ?ndice de iodo, corrosividade ao cobre e aspecto atenderam os limites preconizados pela ANP.

Doctorat en sciences sociales, politiques et économiques / info:eu-repo/semantics/nonPublished

Orientador: Bianca Morelli Rodolfo Calsavara / Dissertação (mestrado profissional) - Universidade Estadual de Campinas, Instituto de Matemática, Estatística e Computação Científica / Made available in DSpace on 2018-08-26T15:10:31Z (GMT). No. of bitstreams: 1 SalesFilho_Nazime_M.pdf: 36937949 bytes, checksum: 4ceff2992bbc8648a89104715aac602e (MD5) Previous issue date: 2015 / Resumo: Neste trabalho será analisado um modelo matemático que descreve a propagação da dengue. Tal modelo é dado por um sistema de equações diferenciais ordinárias não lineares sujeitas a condições iniciais, que descreve duas populações: a de mosquitos e a humana. A população de mosquitos é dividida em duas subpopulações: fase aquática, incluindo os ovos, larvas e pupas, e fase alada, que é subdividida em mosquitos suscetíveis e infectados. A população humana é dividida em subpopulações de suscetíveis, infectados e removidos. No modelo citado é assumido que a população de mosquito e a população humana atingiram homogeneidade espacial, isto é, não há movimentação destas populações influenciando na disseminação da doença. O principal interesse neste trabalho é analisar qualitativamente o comportamento das populações em torno dos pontos de equilíbrio do sistema. Para este fim, além do uso de ferramentas analíticas também foram realizadas simulações numéricas utilizando o software Maple. Dessa forma foi possível obter informações sobre a disseminação da dengue, sob algumas hipóteses, mesmo sem obtermos solução explícita do sistema / Abstract: In this work it will be analyzed a mathematical model describing propagation of dengue disease. This model is given by a system of nonlinear ordinary differential equations, subjected to initial conditions, involving two populations: one of mosquitos and another of humans. The mosquitos population is divided in two subpopulations: the aquatic phase, including eggs, larvae and pupae, and the winged phase, that is divided in susceptible and infected mosquitos. The human population is divided in subpopulations of susceptible, infected and removed. In the cited model it is assumed that the mosquito and human populations achieved spatial homogeneity, i.e., there is no movement of these populations affecting the disease dissemination. The main interest of this work is to analyze qualitatively the populations behavior around the equilibrium points of the system. To this end, in addition to the use of analytical tools, numerical simulations were performed by using Maple software. In this way, it was possible to obtain information about dengue dissemination, under some hypotheses, even without obtaining explicit solution for the system / Mestrado / Matematica Aplicada e Computacional / Mestre em Matemática Aplicada e Computacional

This diploma thesis deals with the business plan, which is the development of a new product of already established company. For good processing of the business plan, the findings are written in the theoretical part of the thesis. These include the data processed in the analytical part and also in draft part, which should reflect the current economic situation of the company and results in possible scenarios of the project.

The main aim of my diploma thesis is to prepare easy math model, which can help to understand the development of economic indicators in time. This math model will show the dependence and important moment in their development and can help to improve the efficiency of company. All math models will be working up in system Maple which is very good helper in working up of big group of data. The partial aim is to show characteristics of company, to valorize the efficiency of company and compare this efficiency with main competitors. The results will be recommendations which should help positive influence the future efficiency of company, help with choose of strategy and the make a better position on the market.