Updated: 2011-02-25 05:02:29
In late 2010, three seasoned industry professionals, with a combined experience in the permanent-magnet sector of almost 100 years, published the industry’s most comprehensive reference and resource report in a generation. Compiled by Walt Benecki, Terry Clagett & Stanley Trout, the 400-page “Permanent Magnets 2010-2020” report is, according to the authors, “a professionally bound book, designed to [...]
Updated: 2011-02-08 16:31:00
: Pages Home About physicsplus The Physics Site for Success In science one tries to tell people , in such a way as to be understood by everyone , something that no one ever knew before . But in poetry , it's the exact opposite Paul A . M . Dirac Tuesday , February 08, 2011 Two Questions on Zener Diode Voltage Regulators It is unwise to be too sure of one’s own wisdom . It is healthy to be reminded that the strongest might weaken and the wisest might err” Mahatma Gandhi Zener diodes , as you know , are widely used as reference voltage elements in a variety of voltage regulator circuits . Today I give you a couple of multiple choice questions involving the use of zener diodes in simple voltage : regulators 1 In the circuit shown , D 1 is a silicon diode which has a voltage drop of 0.7 V
Updated: 2011-02-08 00:00:12
Neutron scattering analysis of two families of iron-based materials suggests that the magnetic interactions thought responsible for high-temperature superconductivity may lie "two doors down": The key magnetic exchange pairings occur in a next-nearest-neighbor ordering of atoms, rather than adjacent atoms........
Updated: 2011-02-04 09:35:00
: Pages Home About physicsplus The Physics Site for Success In science one tries to tell people , in such a way as to be understood by everyone , something that no one ever knew before . But in poetry , it's the exact opposite Paul A . M . Dirac Friday , February 04, 2011 Kerala Medical Entrance 2008 KEAM 2008 Questions on Communication Systems The following multiple choice questions on communication systems appeared in the Kerala Medical Entrance 2008 KEAM-2008 examination question : paper 1 A 1000 kHz carrier wave is modulated by an audio signal of frequency range 100-5000 Hz . Then the width of the channel in kHz is a 10 b 20 c 30 d 40 e 50 Let us assume that the system uses amplitude modulation of the usual double sideband type . It should have been mentioned in the question The
