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The friction stir welding technique is predominantly considered to be one of the most promising welding techniques in the last decade. With regard to Al-alloys, unweldable by traditional welding processes, friction stir welding is currently more common with a significant degree of acceptability for industrial applications. Undoubtedly, the ideal control of the variables of friction stir welding processes leads to a significant improvement in the mechanical properties of the welded joints. Thus, it is of interest to achieve the optimal conditions of the friction stir welding process. The aim of this study is to optimize the process conditions of the optimum dissimilar aluminum alloys (AA6061 and AA7075) friction stir welding in terms of mechanical properties (UTS, ductility, hardness, and Impact strength) using Fuzzy AHP-TOPSIS-based Taguchi Approach. In order to find the optimal conditions, the Taguchi orthogonal array L9, designed by considering three levels of process parameters (rotational speed, traverse speed, and axial force) was utilized. The results of the application of the fuzzy AHP-TOPSIS method showed that the conditions of friction stir welded process (traverse speed 25 mm/min, rotational speed 1400 r/min, and Axial force 6 kN) exhibited the maximum mechanical properties: UTS of 91 Mpa, ductility of 7.5%, Brinell Hardness (HB) of 91.3, and impact strength of 8 J. [ABSTRACT FROM AUTHOR]

Image compression is the latest trend in the entire world. Images can be compressed to reduce their file sizes, which in turn reduces the time it takes to upload and download them to a website and the amount of space they take up on a server. The goal of image compression is to reduce the amount of data needed to represent a image digitally and to do it at a low bit rate without significantly diminishing the image quality. The image can be restored from its compressed state. One way to informally categorize image compression methods is by whether the original image can be faithfully reconstructed from the compressed version. This are what we call a lossless technique and a lossy technique, respectively. Ultrasound, CT scans, and MRI images are used as part of the datasets for this investigation. As chronic diseases are increasingly prevalent, there has been a substantial increase in the number of diagnostic images produced. annually employed technology. But, storage is a major issue since there isn't enough capacity to save all of these expanding medical imagegraphs. Vector quantization in addition to two level wavelet transform used in this work to achieve the aim. Multiple evaluation technique is used to evaluate the results which are PSNR, MSE, RMSE, SSIM. [ABSTRACT FROM AUTHOR]

Path planning within three-dimensional environments is of great importance in contemporary time due to the introduction of robots in many works. Finding the shortest path reduces fuel and time. In this paper a new algorithm is proposed to plan the paths within 3D environments. The algorithm was tested in two ways: simulation and practical. A multi-propeller vehicle is built that can track the resulting path from the proposed algorithm. The spherical shape of the robot, and obstacles is the basic of the work of the proposed algorithm. This does not mean that the algorithm cannot handle other forms of obstacles. Any other shape can be represented by a set of intersecting spheres. The resulting path of this proposed algorithm consists of two pieces that can be repeated a number of times until reaching the target point. The first piece is a straight path connecting the current position of the robot with a point located on the edge of the obstacle. The second piece is a path around the obstacle connecting two points away from the obstacle with a distance equal to the radius of the robot. All points are calculated by equations derived in this paper. The proposed algorithm was compared with two other algorithms. The results proved the superiority of the proposed algorithm in terms of path length and smoothness of the path. [ABSTRACT FROM AUTHOR]

Abstract. The exacerbation of urban problems and their multiplicity over time led to the emergence of several concepts, including the human city, whose content is one of the old concepts in urban planning. It began to be addressed by theorists and scholars of urban planning and design during the stages of the European Renaissance, whose urban environment changed due to population growth and increasing urban expansion with the complexity of urban life. Now, the need to revive this concept after its neglect for several decades has become necessary. The research decided to delve into this concept and its most important goals and principles and link it with the city's environmental planning based on the organic theory and considering it the basis for urban planning, As well as connecting its content and clarifying the relationship with the general planning characteristics in the planning of the traditional Arab city. [ABSTRACT FROM AUTHOR]