Sharif Digital Repository

The healthcare industry collects huge amounts of healthcare data which, unfortunately, are not“mined” to discover hidden information for effective decision making. Discovery of hidden patterns and relationships often goes nexploited. Advanced data mining techniques can help remedy this situation. The diagnosis of diseases is a vital and intricate job in medicine. The recognition of heart disease from diverse features or signs is a multi-layered problem that is not free from false assumptions and is frequently accompanied by impulsive effects. Thus the attempt to exploit knowledge and experience of several specialists and clinical screening data of patients composed in databases to assist the... 

This thesis studies a gas condensate reservoir and considers the effect of different parameters. In this group of gas reservoirs, if the pressure drops below the dew point pressure, liquid phase appears. Appearing and disappearing of phases creates four regions in the reservoir. In the region far from the production well, pressure is still above the dew point pressure and vapor phase is present. By approaching production well, pressure drops below the dew point pressure and liquid phase starts to form but it is immobile. In closer regions to the well the liquid phase saturation grows and this phase becomes mobile. As a result, relative permeability of the vapor phase decreases sharply. In... 

If the reservoir temperature lies between the critical temperature and cricondentherm of the reservoir fluid, the reservoir is classified as a retrograde gas-condensate reservoir. When the pressure is decreased on these mixtures, instead of expanding or vaporizing as might be expected, they vaporize instead of condensing. If the reservoir pressure is above the upper dew-point pressure, the hydrocarbon system exists as a single phase in the reservoir (region 3). As the reservoir pressure declines isothermally during production from the initial pressure to the upper dew-point pressure, the attraction between the molecules of the light and heavy components move further apart. As this occurs,... 

In recent years, oil and gas reservoirs are one of the most valuable natural resources and are the main economical basis of the country. Therefore any research which can help to optimize the efficiency and enhance their recovery is of great importance. In the past 30 years, reservoir simulation has evolved from a research field to one of the most flexible tools in reservoir engineering. Simulation is usually more quick, cost effective and reliable than other methods in predicting reservoir performance. Because of complexity of the great amount of computations, research in oil reservoirs field is usually done by mathematical/computer programs, named as simulators. For this reason, various... 

Peer-to-Peer network has given a great deal of notice in last few years, and a large number of scientific conferences and publications have focused on this issue. Development of P2P networks has been rapidly done as a large fraction of the internet traffic is generated by P2P application in different fields such as content-distribution (iBBC), privacy protection (Tor), file sharing (bit-torrent), real- time communication (Skype), web-based search (YaCy), and so forth. So, the tremendous growth of P2P network escalates the importance of researching in this field. In this thesis, we tried to study different models over P2P networks and use hybrid approach in our design. In general [22],... 

Due to rapid growth of energy consumption in recent years, extensive efforts to improve energy efficiency in production and consumption sectors have been done in order to reduce energy consumption in these sectors. The primary assumption is that improving energy efficiency has a one-to-one impact on reducing energy consumption, but in practice this is not true in all cases. In fact, by elevating energy efficiency, the cost of energy services is decreased and, thus, remained accessible income is increased. This issue will increase the demand for all energy and non-energy commodities, therefore, it will have influence on their supply. The effects of this variation in supply can be spread in... 

To achieve the highest amount of FOPT during reservoir life and the most net present value, the parameters that are effective in the production of the field are adjusted to be the best performance. In order to achieve these conditions, the reservoir model and the surface will be checked integrated so that the optimal mode of each parameter is determined in interaction with other parameters, so the first integrated model of the reservoir and the surface and then optimizing the target functions of cumulative production and the net present value is performed using the genetic algorithm.Since the number of parameters of reservoir model and surface in the studied field in this study is high,... 

The population growth and scarcity of resources such as water and land make the food security as one the most important critical priorities in the world. Development of food production in greenhousesinstead of the traditional agriculture in rural areas is an efficient and applicable approache to reach food security and optimum use of water resources. However, this requires more capital. An important part of this cost is related to the cost of energy supply for heating and cooling in order to provide a suitable condition for the growth of plants. Optimal design of a rural energy supply and optimal operation of existing greenhouses to maximize the benefit of the greenhouse owners and to... 

Nowadays, one of the most important challenges in developing and operating greenhouses in the agricultural sector is to supply them with energy. Hence, in recent years, the development of greenhouses with the goal of increasing energy efficiency and reducing production costs has been considered by the hands-on-cluster of this field. As a result, one of the main goals for the development of high-productive greenhouses is to reduce the energy consumption index for the production of a unit of product. Another challenge in the greenhouse is the high consumption of water for evaporative cooling systems. On the other hand, the supply systems for heating, cooling and ventilation should be able to... 

The main purpose of this research is analyzing the energy stream of clean food production by using Iran's power plants sourced waste heat. In order to achieve this goal, at first, greenhouse heating demand model according to the type of crops and geographic location of greenhouse, heat transport from power plant to greenhouse model, and heat exchanger model is presented. Then, the potential of constructing clean greenhouse around power plants has been evaluated by using the concept of industrial symbiosis and by integrating greenhouse energy demand, waste heat transport, and heat exchanger models into industrial symbiosis concept framework and also by economical and geographical assessments.... 

The purpose of this study is to introduce a new indicator to estimate the amount of irrigation water in excess of the need and also to determine the optimal irrigation pattern to reduce water loss in agriculture. According to the Food and Agriculture Organization of the United Nations, the major loss of fresh water takes place in agriculture, and the reduction of water resources is more significant in developing countries that do not have advanced agricultural equipment. One of the challenges in the studies related to reducing the amount of water used in agriculture is a lack of knowledge on the spatial distribution and temporal changes in water loss in a region. Although estimation of... 

The manifolds that will play the central role in this thesis are b-Poisson manifolds. These manifolds are a special sub-class of Poisson manifolds which are in many ways close to being symplectic: For π the Poisson structure dual to a symplectic form, the top wedge π^nnever meets the zero section of Λ^2n TM (non-degeneracy of the symplectic form). We define a b-Poisson manifold to be a Poisson manifold (M,π)such that π^n vanishes transversally to the zero section in Λ^2n TM. A pivotal result about the dynamics of integrable systems is the Liouville-Arnold-Mineur theorem (or action-angle coordinate theorem), which states that the compact common level sets of the integrals f_iare tori that... 

In this thesis, a typical dynamic model of syngas fermentation, refered as hybrid method for biofuels production, coupled with a distillation column is developed in SimDFBA. The bioreactor is simulated in MATLAB/Simulink by using Clostridium ljungdahlii acetogenic micro-organism metabolic network. Bioreactor modeling is accomplished with a bubble column reactor in both liquid and gas phases, while the separator was simulated with ASPEN. PDE equiations of bioreactor modeing are dicretized to ODE equation by using QUICK scheme of finite volume method. A new econometric optimization study for outlet gas purification through a pressure swing adsorption unit to recycle relatively pure hydrogen is... 

Water-energy nexus approach is any water and energy interaction in a system to provide sustainable usage of resources. Quantitative model of interaction of water and energy in analyzing water-energy nexus is not comprehensive approach for solving all challenges facing this section. Qualitative analysis of water-energy nexus provides optimization and prioritization solutions in water and energy systems from other aspects. In present thesis two quantitative and qualitative aspect of water-energy nexus is considered. Initially, for quantitative modeling, interaction and relation of water and energy (watergy) with six principles to form WatErgy Reference System (WERS) was presented. The...