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DOE Material Science 1
DOE Material Science 1

... Solids have greater interatomic attractions than liquids and gases. However, there are wide variations in the properties of solid materials used for engineering purposes. The properties of materials depend on their interatomic bonds. These same bonds also dictate the space between the configuration ...
lagrangian evolution of hairpin structures in the temporal transition
lagrangian evolution of hairpin structures in the temporal transition

... wall turbulence. Zhou et al. (1999) discussed the mechanism of the evolution of a single hairpin vortex-like structure into coherent packets of hairpin vortices in a low-Reynoldsnumber channel flow. Combining PIV experiments and direct numerical simulations, Adrian (2007) thoroughly reviewed the dyn ...
Analysis of the Service Straining on the Beam
Analysis of the Service Straining on the Beam

... Námestieslobody 17, 812 31 Bratislava, Slovakia ŠulkoMiroslav, Ph.D Slovak University of Technology Faculty of Mechanical Engineering Námestieslobody 17, 812 31 Bratislava, Slovakia ...
Modeling and Parametric Identification of a Variable
Modeling and Parametric Identification of a Variable

Advanced structural ceramics
Advanced structural ceramics

... powder. Plastics may also be added to provide pliability. The powder can then be shaped into different objects by various molding processes such as slip casting, pressure casting, injection molding, and extrusion. After oxide ceramic materials are molded, they are heated in a process known as densif ...
Problems with Pitots - Source Testing Association
Problems with Pitots - Source Testing Association

A Refined Energy-Based Model for Friction-Stir Welding
A Refined Energy-Based Model for Friction-Stir Welding

... Abstract—Friction-stir welding has received a huge interest in the last few years. The many advantages of this promising process have led researchers to present different theoretical and experimental explanation of the process. The way to quantitatively and qualitatively control the different parame ...
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SIZHAO (FOX) HUANG

Effects of surface charge density and distribution on the
Effects of surface charge density and distribution on the

... whole system was electrically neutral with a resulting NaCl concentration in the channel center of ≈1.2 M. Final configuration, excluding water molecules, is shown in Figure 1. Water molecules and ions were inserted between the walls using the PACKMOL package (Martı́nez et al. 2009), followed by the ...
Mechanical Properties and Fracture Patterns of Graphene (Graphitic
Mechanical Properties and Fracture Patterns of Graphene (Graphitic

... tion of their graphene-like strength [30, 17]. The mechanical properties of graphene have been intensively investigated by different methodologies, both in experiments and in theory. Based on atomic force microscope (AFM) nanoindentation experiments, it was found that the Young’s modulus of free st ...
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ECOLE POLYTECHNIQUE Mathematical Analysis of a Saint

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1 Figure 1: Paddle wheel dipped into fluid flowing in

Physical Principles - Thayer School of Engineering
Physical Principles - Thayer School of Engineering

... the lake. Assuming that there is no ground seepage, the loss can only be caused by evaporation at the surface. Knowing that the lake surface area is 1500 km2 , we can determine the rate of evaporation by performing a water budget for the lake. Density variations are quite negligible in this case, an ...
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Low Noise, increased reliability, digital control

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New generation of subsea BOP equipment, controls smaller

... 4,000 psi. A pump this size (225 gallons/ min, 4,000 psi discharge pressure) would be exceedingly large and consume too much hydraulic fluid to pump it to surface. It was decided to design a more reasonable, smaller pump and add a reserve capacity. The decided ratio of the hydraulic section to the d ...
Lithospheric necking: a dynamic model for rift morphology
Lithospheric necking: a dynamic model for rift morphology

... Rifting is examined in terms of the growth of a necking instability in a lithosphere consisting of a strong plastic or viscous surface layer of uniform strength overlying a weaker viscous substrate in which strength is either uniform or decreases exponentially with depth. As the lithosphere extends, ...
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e5-impact of water jet

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Solution - Icivil-Hu
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... Eulerian form using the Reynolds transport theorem. The extensive property Bsys becomes the angular momentum of the system: Bsys = Hsys. The intensive property b becomes the angular momentum per unit mass. The angular momentum of an element is r × mv, and so b = r × v. Substituting for Bsys and b in ...
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Effect of material and geometric parameters on deformations near

Principles of Active Vibration Control
Principles of Active Vibration Control

... Since, this effect also applies in the reverse manner; a voltage across the sample will produce stress within the sample. The word “piezo” is a Greek word which means “to press”. Therefore, piezoelectricity means electricity generated from pressure - a very logical name. Suitably designed structures ...
View - OhioLINK Electronic Theses and Dissertations Center
View - OhioLINK Electronic Theses and Dissertations Center

... get quite as brittle. In 1823, Charles Macintosh found a practical process for waterproofing fabrics, and in 1839 Charles Goodyear discovered vulcanization, which revolutionized the rubber industry. Charles Goodyear, an American whose name graces the tires under millions of automobiles, is credited ...
The Ideal Usage of Sustainable Materials And Local Resources
The Ideal Usage of Sustainable Materials And Local Resources

... extraction of materials from virgin resources, saves landfill space and saves money. Reuse and recycling of building material is a growing area of interest and concern in many parts of the world. Current practices and trends in the building material waste management area are examined from a building ...
Ch2Aug2007
Ch2Aug2007

... which would make for an uncomfortable boat ride (high frequency oscillation). Earlier we found that GM should be positive if a ship is to have transverse stability and, generally speaking, the stability is increased for larger positive GM. However, the present example shows that one encounters a “de ...
advanced high density interconnect materials and techniques
advanced high density interconnect materials and techniques

... Metal tracks are formed on the front (top to bottom interconnect) and rear side (back side routing) of the via by depositing Cu layer by electrochemical deposition. ...
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Rheology

Rheology (/riːˈɒlədʒi/; from Greek ῥέω rhéō, ""flow"" and -λoγία, -logia, ""study of"") is the study of the flow of matter, primarily in a liquid state, but also as 'soft solids' or solids under conditions in which they respond with plastic flow rather than deforming elastically in response to an applied force.It applies to substances which have a complex microstructure, such as muds, sludges, suspensions, polymers and other glass formers (e.g., silicates), as well as many foods and additives, bodily fluids (e.g., blood) and other biological materials or other materials which belong to the class of soft matter.Newtonian fluids can be characterized by a single coefficient of viscosity for a specific temperature. Although this viscosity will change with temperature, it does not change with the strain rate. Only a small group of fluids exhibit such constant viscosity. The large class of fluids whose viscosity changes with the strain rate (the relative flow velocity) are called non-Newtonian fluids.Rheology generally accounts for the behavior of non-Newtonian fluids, by characterizing the minimum number of functions that are needed to relate stresses with rate of change of strain or strain rates. For example, ketchup can have its viscosity reduced by shaking (or other forms of mechanical agitation, where the relative movement of different layers in the material actually causes the reduction in viscosity) but water cannot. Ketchup is a shear thinning material, like yoghurt and emulsion paint (US terminology latex paint or acrylic paint), exhibiting thixotropy, where an increase in relative flow velocity will cause a reduction in viscosity, for example, by stirring. Some other non-Newtonian materials show the opposite behavior: viscosity going up with relative deformation, which are called shear thickening or dilatant materials. Since Sir Isaac Newton originated the concept of viscosity, the study of liquids with strain rate dependent viscosity is also often called Non-Newtonian fluid mechanics.The term rheology was coined by Eugene C. Bingham, a professor at Lafayette College, in 1920, from a suggestion by a colleague, Markus Reiner. The term was inspired by the aphorism of Simplicius (often attributed to Heraclitus), panta rhei, ""everything flows""The experimental characterization of a material's rheological behaviour is known as rheometry, although the term rheology is frequently used synonymously with rheometry, particularly by experimentalists. Theoretical aspects of rheology are the relation of the flow/deformation behaviour of material and its internal structure (e.g., the orientation and elongation of polymer molecules), and the flow/deformation behaviour of materials that cannot be described by classical fluid mechanics or elasticity.
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