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Fluid mechanics is the branch of physics which involves the study of fluids (liquids, gases, and plasmas) and the forces on them. Fluid mechanics can be divided into fluid statics, the study of fluids at rest; and fluid dynamics, the study of the effect of forces on fluid motion. It is a branch of continuum mechanics, a subject which models matter without using the information that it is made out of atoms, that is, it models matter from a macroscopic viewpoint rather than from a microscopic viewpoint. Fluid mechanics, especially fluid dynamics, is an active field of research with many unsolved or partly solved problems. Fluid mechanics can be mathematically complex, and can best be solved by numerical methods, typically using computers. A modern discipline, called computational fluid dynamics (CFD), is devoted to this approach to solving fluid mechanics problems. Particle image velocimetry, an experimental method for visualizing and analyzing fluid flow, also takes advantage of the highly visual nature of fluid flow. NOTE: This course was created as a project in the autumn semester of 2014 by the students of the Department of Mechanical Engineering, ZHCET, AMU, Aligarh, registered in the course ME231. Ninety eight students participated in it. Each student contributed a chapter in This course.

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Engineering mechanics is the application of mechanics to solve problems involving common engineering elements. The goal of this Engineering Mechanics course is to expose students to problems in mechanics as applied to plausibly real-world scenarios. Problems of particular types are explored in detail in the hopes that students will gain an inductive understanding of the underlying principles at work; students should then be able to recognize problems of this sort in real-world situations and respond accordingly. Further, this text aims to support the learning of Engineering Mechanics with theoretical material, general key techniques, and a sufficient number of solved sample problems to satisfy the first objective as outlined above. As you see in the diagram mechanics is the first and most fundamental branch of physics, supporting Thermodynamics and Electricity, and including Statics, Dynamics (= Kinematics + kinetics); all of which are highly applicable in engineering. but the most important part of them is statics (study of body at rest) which is not only a base for all others, but also have the highest engineering application. Physics also involve optics, waves, quantum, and relativity theory, which have no fundamental engineering application yet. Classical physics generally includes the old theories in physics that are often used to describe the states of physical phenomena in the macroscopic scale e.g. laws governing the laws of motion of masses usually larger than atoms and molecules. Modern physics on the other hand deals with the more recent theories which govern physical phenomena. Two broad branches of modern physics include quantum physics and relativity. These modern theories surfaced as a result of probes into what happened to matter at much more microscopic and abstract states. Hence, classical theories of physics are often classified as theories dating before the 1900s, while modern physics include theories propounded in the 20th and 21st centuries.

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Structural engineering is a branch of engineering which deals with the analysis and design of various structural systems. Although this branch of engineering has influence on various other disciplines like mechanical or aeronautical engineering, etc., it is more commonly identified with civil engineering. Structural engineering deals with conception, design, and construction of the structural systems that are needed in support of human civil engineering.

"Structural engineering is the art of molding materials we do not really understand into shapes we cannot really analyze, so as to withstand forces we cannot really assess, in sucha a way that the public does not really suspect." British structural engineer Dr. E. H. Brown, from his book Structural Analysis.

Engineers are the invisible presence that brings the architect or designer's concept into reality. In a broad sense, architects create the skin defining the usable flow of space that we live and work - occasionally appearing to defy gravity. The Engineer relies on the physical sciences to create a "skeleton" of interconnected elements that support the shell in the physical world. He or she uses the laws of physics (equilibrium) to design the structure (in part and in whole) to safely support the weight of the permanent building materials, changing movement of people, and short term applications of snow and water. These are defined as the vertical "gravity" loads (NOTE: Refer to topics related to; live, dead, and short-term loads) while resisting the "horizontal" forces of nature due to the worst case comparing; wind and seismic events that may act simualtaneously. Equilibrium is achieved by anchoring the structure to an adequate foundation based on the recommendations of a geotechnical (soils) engineer. Starting at the top and working down to the foundation, the engineer designs each element and the connections supporting the combination of elements to create the "structure" - a sum of its elements (whether a building, soil retaining wall or a bridge). The engineer follows building codes, enacted in state congress to create law that provides a minimum requirement to protect life safety. Working with different building materials (wood, steel, concrete, masonry and/or proprietary connectors and structural systems). LQEngineer (talk) 05:13, 1 September 2009 (UTC)

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The ECR_ECN is a light weight Engineering Change Request/Notice documentation application. It is intended for those who wish to move from the standard paper ECR/ECN process to an automated documentation process.