Random Walk o This involves an atom moving from one interstitial position to another in the crystal lattice o Not a common mechanism for selfdiffusion o Usually faster than vacancy migration because atoms are smaller
Qrandom walk = Emotion
Ethics and Engineering?
On a sheet of paper:
Write your Name, Todays Date.
Introduction to Engineering: The Profession
Take a couple minutes to ponder the
Topic: Engineering Ethics
Lecture 1 of 2
Since youre in this class, you
Parts 1 & 2
ENGN 10A, CCSF
This slide set leverages the work of :
Cushman-Roisin @ Dartmouth College
Theis @ Univ of Illinois
And collaborative discussions at the NSF Funded Workshop (DUE - 1125331):
ENGN 10A - 831
Essay #1: Why Engineering?
Why I Want to Be a Software Engineer
Why do you choose to be a software engineer? I have been answered this question so
many times, and my answer always is: I choose to be a software engineer because I
The Arduino code is used for release the ball after the robot pass by the sensor. It will
automatically trigger the device to release the ball after the specified sensor senses the
movement. At first we tested the codes and it works well, but
6.673E-11 N m^2 / kg
Mass of Saturn (m1) =
Mass of Titan (m2) =
1202830000 (m) <= r <=
Hence, the concentration of point defects (i.e. the number of defects / total number of atomic sites in the crystal lattice) is given by: ndefect = Ce (Edefect) /kT nsites where Edefect is the activation energy required to form the point defect k is Boltz
Point Defects Point defects occur as a direct result of the thermal vibrations of atoms in the crystal structure. Hence as temperature increases, the number of point defects increases exponentially according to the Maxwell-Boltzmann distribution.
Diffusion Diffusion is the material transport by atomic migration. Atoms move from an area of higher concentration to one of lower concentration. This is easy to imagine for gasses and liquids. It is harder to imagine in solids, but diffusion does occur i