The darwinian structure of the design process
This text is meant only to be a stimulus for the discussion to be held, in a specific panel, at Generative Art 2001. In the text, ?provocative enough? to spur animated discussion, some very basics of darwinism and genetics are given with the only purpose of declaring a common ?stage for the play? where everybody feels at ease. Common stage and common vocabulary ifnot even common language. The main thesis is very strong, therefore comments and critics are warmly encouraged. They are the selective
Hidden Line Elimination in Projected Grid Surfaces
The hidden line and hidden surface problems are simpler when restricted to special classes of objects. An example is the class of grid surfaces, that is, graphs of bivariate functions represented by their values on a set of grid points. Projected grid surfaces have geometric properties which permit hidden line or hidden surface elimination to be done more easily than in the general case. These properties are discussed in this paper, and an algorithm is given which exploits them
h-BN inclusion in a β-Si3N4 grain
The micrograph shows h-BN inclusion (precipitate) in a β-Si3N4 grain (within a silicon nitride particulate-reinforced silicon carbide composite). The occurrence of BN inclusions results from the introduction of colloidal BN into the hot isostatic pressing process. They are formed from B2O3 present as a thin surface film on the BN particles in the barrier layer. B2O3 will be molten during the pressing process and will diffuse rapidly into the powder compact and react with Si3N4 to form BN. Such
Beyond Y2k: A Look at Acadia's Present and Future
The sky may not be falling, but it sure is getting closer. Where will you when the last three zeros of our millennial odometer click into place? Computer scientists tell us that Y2K will bring the world?s computer infrastructure to its knees. Maybe, maybe not. But it is interesting that Y2K is an issue at all. Speculating on the future is simultaneously a magnifying glass for examining our technologies and a looking glass for what we become through them. "The future" is nothing new. Orwell's vis
ECorr: Introduction to Corrosion
This case study gives a brief introduction to the subject of corrosion and helps in learning how to navigate and make use of the subsequent case studies. This is an introductory level case study.
Pain and Fatigue in People with Multiple Sclerosis
This presentation is by another member of the MS Rehabilitation Research and Training Center, Dr. Dawn Ehde. Dr. Ehde is also the director of the MS Research Training Fellowship program at the University of Washington. She is an expert on the common, but complex, problem of pain in MS, and her research has focused on innovative methods to manage it. Dr. Ehde talks about pain and the most common MS symptom, first reported by researchers at the University of Washington, fatigue. (Series: Mult
Inside Opera: Tristan and Isolde
Opera’s ultimate love story is a favored piece of the Seattle Opera. In this video from the University of Washington, join opera enthusiast and former Seattle Opera education director, the late Perry Lorenzo, as he shares his insider’s knowledge about composer Richard Wagner and his most influential opera, Tristan und Isolde. Lorenzo highlights Wagner’s place in the Romantic movement of 19th century art.
Tensile test on annealed copper: necking effect
Necking of annealed copper during a tensile test, at five times actual speed. From TLP: Introduction to mechanical testing, http://www.msm.cam.ac.uk/doitpoms/tlplib/mechanical-testing/results2.php
Tensile test on annealed copper
Full tensile test of annealed copper at 20 times actual speed, showing plastic deformation, necking and failure. From TLP: Introduction to mechanical testing, http://www.msm.cam.ac.uk/doitpoms/tlplib/mechanical-testing/results2.php
4-point bending under a circular polariscope of annealed polycarbonate bar
Annealed bar undergoing 4-point bending under a circular polariscope, From TLP: Introduction to photoelasticity, http://www.msm.cam.ac.uk/doitpoms/tlplib/photoelasticity/index.html
3-point bending under a circular polariscope of annealed polycarbonate bar with a notch
Annealed, polycarbonate bar with a notch undergoing 3-point bending under a circular polariscope. From TLP: Introduction to photoelasticity, http://www.msm.cam.ac.uk/doitpoms/tlplib/photoelasticity/index.html
3-point bending under a circular polariscope of annealed polycarbonate bar
Annealed, polycarbonate bar undergoing 3-point bending under a circular polariscope, From TLP: Introduction to photoelasticity, http://www.msm.cam.ac.uk/doitpoms/tlplib/photoelasticity/index.html
Interactive model of an screw dislocation
Interactive, rotatable model of an screw dislocation. From TLP: Introduction to dislocations, http://www.msm.cam.ac.uk/doitpoms/tlplib/dislocations/dislocations_in_3D.php
Interactive model of an edge dislocation
Interactive, rotatable model of an edge dislocation. From TLP: Introduction to dislocations, http://www.msm.cam.ac.uk/doitpoms/tlplib/dislocations/dislocations_in_3D.php
Slip by movement of whole lattice planes
Animation of slip by movement of whole lattice planes. Shows how plastic shear deformation occurs in a 2D primitive square lattice without dislocation glide. From TLP: Introduction to dislocations, http://www.msm.cam.ac.uk/doitpoms/tlplib/dislocations/dislocation_glide.php
Slip by dislocation glide
Animation of slip by dislocation glide. Dislocation glide allows plastic deformation to occur at a much lower stress than would be required to move a whole plane of atoms past another. See also the bubble raft experiment (videos 17 and 18). From TLP: Introduction to dislocations, http://www.msm.cam.ac.uk/doitpoms/tlplib/dislocations/dislocation_glide.php
Shear deformation in bubble raft
Bubble raft undergoing shear deformation. The direction along which dislocations generally move is that with the highest resolved shear stress. From TLP: Introduction to dislocations, http://www.msm.cam.ac.uk/doitpoms/tlplib/dislocations/dislocation_motion.php
Compressive and tensile deformation in bubble raft
Bubble raft undergoing compressive and tensile deformation. At small strains, the arrangement of the bubbles does not change. This is elastic deformation of the raft. The bubbles change shape and move slightly apart in an effort to maintain the lowest energy close-packed configuration. At larger strains, plastic deformation occurs. The bubble raft rearranges by dislocation motion. From TLP: Introduction to dislocations, http://www.msm.cam.ac.uk/doitpoms/tlplib/dislocations/dislocation_motion.php
TALAT Lecture 5102: Reactivity of the Aluminium Surface in Aqueous Solutions
This lecture provides better understanding of the electrochemistry of aluminium; it gives an introduction to the other lectures. Some knowledge in aluminium metallurgy, simple chemistry (thermodynamics and kinetics), electricity and general electrochemistry is assumed.
TALAT Lecture 3201: Introduction to Casting Technology
This lecture provides an introduction to the techniques used to produce castings and to the range of castings produced; it aims at gaining an appreciation of the production and application of castings.
