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The Internet’s rapid growth has spurred the development of new protocols and algorithms to meet changing operational requirements such as security, multicast transport, mobile networking, policy management, and quality of service support. Development and evaluation of these operational tools requires answering many design questions. This work proposes a computer network simulation program, devoted for wired LAN systems. The simulator would be able to work under Microsoft Windows NT platforms, also it has the potential to provide an emulation environment which should be suitable for testing protocols above the TCP layer under the Windows NT platform supported network layers, and offering scalability by running the simulator under distributed network system.

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There are many techniques to extract features. Some use direct and other use transformation such as Fourier Transform, Discrete cosine transform and Wavelet Transform. Such Transforms convert the signal from time domain to frequency domain and vice versa. The Wavelet Transform conducts the change a frequency and reflects that in time. This research uses the Wavelet Transformation method to process images with (128*128) pixels, knowing that these images are in grayscale. An algorithm is proposed for texture classification using Wavelet Transform. The texture classification of an image means dividing it into sub images of fixed or variable length. Hence, this algorithm first takes the image and then it divides it into block of (8*8) dimension. There are two phases mainly in the proposed algorithm, classification and retrieval phases. In the classification phase, the procedure that followed requires the texture segmentation and wavelet transform computation of the test image. In the retrieval phase, the classified texture will be labeled following a given logical decision.

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Geologic modeling is the art of constructing a structural and stratigraphic model of a reservoir from analyses and interpretations of seismic data, log data, core data, etc. ‎[1]. A static reservoir model typically involves four main stages, these stages are Structural modeling, Stratigraphic modeling, Lithological modeling and Petrophysical modeling ‎[2]. Ismail field is exploration structure, located in the north Iraq, about 55 km north-west of Kirkuk city, to the north-west of the Bai Hassan field, the distance between the Bai Hassan field and Ismael field is about one kilometer ‎[3]. Tertiary period reservoir sequences (Main Limestone), which comprise many economically important units particularly reservoir pay zone, in Ismail field are belong to middle Miocene age and Oligocene age, which includes six formations, Jeribe, Bajwan, Baba, Baba/palani and Palani formation. The information of Ismail field such as final well report, drill stem test, completion test and well logs data also previous studies and results of core data, indicated that hydrocarbons are accumulated in the Baba formation. The main purpose of this study is to make use of all the available sets of data acquired from Ismail field to build a static geological model for Baba formation in Ismail field to get full description for this reservoir.

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Any software application can be divided into four distinct interconnected domains namely, problem domain, usage domain, development domain and system domain. A methodology for assistive technology software development is presented here that seeks to provide a framework for requirements elicitation studies together with their subsequent mapping implementing use-case driven object-oriented analysis for component based software architectures. Early feedback on user interface components effectiveness is adopted through process usability evaluation. A model is suggested that consists of the three environments; problem, conceptual, and representational environments or worlds. This model aims to emphasize on the relationship between the objects and classes in the representational model and the elements in the considered system. Implementing this model on some practical examples is investigated and resulted into promising improvement in software design and understanding.

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At the beginning of the twentieth century a number of modern art movements like Cubism, Expressionism, Fauvism, Futurism and Abstractionism appeared with cogently various styles. As these so-called schools of art have parodied modern life, the researchers have found it quite necessary to account for the concept of geometric modeling that marks modern art, hence being the core of the study. Based on an analytical and historical approach, the study has been concerned with this phenomenon from several angles . The research approach accounts for the problem, significance, objective and limits of the research in addition to the terminology. The theoretical framework takes into consideration the references of geometric modeling from historical, philosophical and artistic angles. Then light has been shed on geometric modeling in the modern European painting, hence tackling such movements as Cubism, Futurism and Abstractionism. The study has also included the research population, samples in line with analyses of some of artists' works, reaching a number of outcomes, conclusions, recommendations and suggestions the first of which relates to the crying need for more studies dealing with the controversy over the concept of geometric models in modern European painting. (words)

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The dynamics of wind turbine has to be studied carefully to avoid unpredictable outputs and to make sure that consistent and efficient power is supplied according to the load requirements. There is a great and urgent necessity to increase the efforts in the development of the researches of the renewable energy to decrease the dependency on the conventional ones. The objective of this research is to make a contribution to the ongoing wind turbine research in the area of modeling, which is the first step required for the control and implementation of wind turbines. The wind turbine transfer function is derived and its performance has been established using the MATHLAB Software. This research provided a different approach to wind turbine modeling methodology. The results of this research may be used in another step for completing the control process of the wind turbine.

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The study introduces a theoretical analysis and numerical solution for the combustion of a hydrocarbon fuel droplet inside the combustion chamber. The study employs two mathematical models to analyze the combustion process. Conventional (Classical) model and Transient model. The combustion process of a stagnant droplet in the steady state was analyzed in the classical model, while, In the transient model, it was assumed that there is a period of time in the stages of the droplet combustion in which the droplet is heated before combustion. The effect of change in temperature on the thermo-physical properties of the fuel was adopted through the two models. For the classical model, a convenient approximation was adopted for the heat transferred inside the droplet.

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Ex perimental and numerical study has been achieved on a hypoeutectic Al - Si alloy under the effect of directional solidification in ceramic mold chilled with copper. From the coupling between experimental (microstructure evaluation) and numerical (solidification simulation) study, a model is obtained. This model can be used to predict the microstructural features of a hypoeutectic Al – Si alloys.

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Hydrogeochemical characteristics of groundwater in Debaga Basin were studied. PhreeqC-modeling was done for 99 water analysis including calculation of Saturation Indices (SI) ,precipitation and dissolution of calcite and gypsum, respectively. Variations of the pore space resulting from the last two processes were also highlighted. Because of the fact that the groundwater is mainly used as irrigation water, processes which may influence the water chemistry were also modeled. These processes are equilibration with atmospheric conditions (degassing of CO2) and losses of irrigation water by evaporation up to 20%. The groundwater in Debaga Basin is supersaturated with respect to calcite and dolomite and under-saturated with respect to gypsum. However, precipitation of calcite will have no negative influence on pore space. Changes in water chemistry will mainly occur by degassing of CO2, which will result in a lower solubility for calcite and an increase of the SI for calcite. This significant super saturation with respect to calcite will lead to precipitation of calcite, since the water is used as irrigation water. This will mainly affect the calcite content of the agricultural soils, which are still shows high calcite concentrations. Evaporation losses of the irrigation water have only slightly influence on further precipitation of calcite.

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Abstract:Communication network efficiency depends upon many factors among which is the “Topology” which makes topology optimization an important issue to care for. One important thing in optimization problems is the formulation of objective functions. For the case of topology design it is not a straightforward matter to develop an efficient topology model as well as objective functions to be used in the optimization process. An effective unconventional approach is needed. This paper is concerned with enhancing the already existing set of formulas, relating topology and topology properties modeling and topology design objectives, by proposing a 3-dimension way of modeling that can serve network analysis, design, and optimization. The approach is based on graph theory. The proposed model and formulas can be easily programmed.

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