We present a novel system productivity simulation and optimization modeling framework in which equipment availability is a variable in the expected productivity function of the system. The framework is used for alloca...We present a novel system productivity simulation and optimization modeling framework in which equipment availability is a variable in the expected productivity function of the system. The framework is used for allocating trucks by route according to their operating performances in a truck-shovel system of an open-pit mine, so as to maximize the overall productivity of the fleet. We implement the framework in an originally designed and specifically developed simulator-optimizer software tool. We make an application on a real open-pit mine case study taking into account the stochasticity of the equipment behavior and environment. The total system production values obtained with and without considering the equipment reliability, availability and maintainability (RAM) characteristics are compared. We show that by taking into account the truck and shovel RAM aspects, we can maximize the total production of the system and obtain specific information on the production availability and productivity of its components.展开更多
Clarice Lispector is one of the most important Brazilian writers of the 20th century.In her writings,she explores the limits of the Portuguese language and creates her own literary style.The article will map some of h...Clarice Lispector is one of the most important Brazilian writers of the 20th century.In her writings,she explores the limits of the Portuguese language and creates her own literary style.The article will map some of her aesthetic searches that are,at the same time,vital.The article is organized through two moments:a biographical one,in which relevant aspects of her life that will have an echo in her work are indicated;and another focused on her fiction writing,in which the aesthetic commitment of her books is highlighted.The Hour of the Star is the title of her latest novel,a title read by Helene Cixous as an anticipatory metaphor for her own death.We return to it as a trope,no longer to refer to its finiteness but to celebrate its opportune rereading outside Latin America.展开更多
文摘We present a novel system productivity simulation and optimization modeling framework in which equipment availability is a variable in the expected productivity function of the system. The framework is used for allocating trucks by route according to their operating performances in a truck-shovel system of an open-pit mine, so as to maximize the overall productivity of the fleet. We implement the framework in an originally designed and specifically developed simulator-optimizer software tool. We make an application on a real open-pit mine case study taking into account the stochasticity of the equipment behavior and environment. The total system production values obtained with and without considering the equipment reliability, availability and maintainability (RAM) characteristics are compared. We show that by taking into account the truck and shovel RAM aspects, we can maximize the total production of the system and obtain specific information on the production availability and productivity of its components.
文摘Clarice Lispector is one of the most important Brazilian writers of the 20th century.In her writings,she explores the limits of the Portuguese language and creates her own literary style.The article will map some of her aesthetic searches that are,at the same time,vital.The article is organized through two moments:a biographical one,in which relevant aspects of her life that will have an echo in her work are indicated;and another focused on her fiction writing,in which the aesthetic commitment of her books is highlighted.The Hour of the Star is the title of her latest novel,a title read by Helene Cixous as an anticipatory metaphor for her own death.We return to it as a trope,no longer to refer to its finiteness but to celebrate its opportune rereading outside Latin America.
