The essential particles that construct all materials are electrons, neutrons and protons. Protons and neutrons form the atomic nucleus - electrons fill the atomic…
Month: March 2018
Crystal lattice and miller indices
This post is about structure of solid state materials, their properties and quantitative characteristics. Crystal lattice A crystal lattice is the basis of the…
Defects in solids
This post answers the question "What are defects in crystals?". There are no naturally occurring ideal crystals. Every solid compound has some deviation from…
Polymorphism
Polymorphism is the ability of solids to form more than one crystalline lattice, that is stable for different pressures and temperatures. These lattices are…
Energy band theory
Energy band theory is a basis for describing processes and effects in solid crystals under electromagnetic field impact. Energy band theory is a theory…
Complex conductance. Active and reactive power
Complex conductance Y is the value, reverse to the complex resistance Z, where Y=1Z=ye-jφ. Complex conductance is measured with Siemens (1Ohm), Y=1R+jX=R-jXR2+X2=RR2+X2-j XR2+X2. Ohm Law’s using the conductivity…
Young engineers crowned FIRST LEGO League UK champions
A team of young engineers from Wallace Hall Academy in Dumfriesshire, Scotland have been crowned champions of the Institution of Engineering and Technology’s (IET) FIRST LEGO League UK…
Two-terminal networks in the AC circuit
Let's consider a passive two-terminal network, connected to the input source E. The input resistance in this case is Zin=EI, Zin=Rin+jXin, the input conductance is Yin=1Zin. If the Xin<0, then…
University of Derby students win national bursary for engineering talent
Three students from the University of Derby have received Engineering Horizons Bursaries from the Institution of Engineering and Technology (IET). Michael Cane and Kyran…
Induction motor
An induction motor is a type of electric machine. Here the stator coils produce a magnetic field, and this magnetic field induces a current,…