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Τετάρτη 4 Φεβρουαρίου 2015

#55: Back to Basics: Tutorial on LC Resonant Circuits

  

55: Back to Basics: Tutorial on LC Resonant Circuit



Δημοσιεύτηκε στις 23 Ιουλ 2012
This video builds upon the voltage / current phase relationships that were demonstrated in the previous video:
http://www.youtube.com/watch?v=ykgmKO...
to
show how these lead/lag relationships give rise to the unique
properties of series and parallel resonant LC circuits. The voltage and
current waveform phases are examined, and it is shown how these
waveforms combine at resonance. The result of this paper analysis is
also shown live on the oscilloscope. These simple circuits can be used
to create frequency selective networks which are useful in filters,
oscillators and other AC circuits.
ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 4/2/2015

Electric Circuits - Electrical Engineering Fundamentals - Lecture 1

  

Electric Circuits - Electrical Engineering Fundamentals - Lecture 1



Δημοσιεύτηκε στις 15 Απρ 2012
In this lecture, we will cover the following:
- Voltage, Current, and Power.
- Circuit Schematic and Ideal Basic Circuit Elements.
- Independent and Dependent Voltage and Current Sources.
- Ohm's Law or the Electrical Resistance.
- Kirchhoff's Current Law (KCL) and Kirchhoff's Voltage Law (KVL).
- Solving examples and problems containing dependent and independent sources.

Please note that in problem 1 on slide 29, the 3 Ohm resistor should be 5 Ohms.

More information provided on my website: http://users.encs.concordia.ca/~s_esma/

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Oscillators, the Basic Tank Circuit 2

   

Oscillators, the Basic Tank Circuit 2





Ανέβηκε στις 19 Δεκ 2010
Oscillators, the Basic Tank Circuit 2

Oscillators, the Basic Tank Circuit 1

   

Oscillators, the Basic Tank Circuit 1



Ανέβηκε στις 10 Δεκ 2010
Oscillators, the Basic Tank Circuit

Measure For Measure: Quantum Physics and Reality -- World Science Fest...

  

Measure For Measure: Quantum Physics and Reality  --  World Science Fest...



Δημοσιεύτηκε στις 3 Ιουν 2014
World Science Festival 2014 discussion on the measurement problem in quantum mechanics

David Albert
Sean Carroll
Sheldon Goldstein
Rüdiger Schack

Moderated by Brian Greene
Introduction by Tracy Day

Τρίτη 3 Φεβρουαρίου 2015

Space Shuttle STS-112 Atlantis Space Station Assembly ISS-9A S1 Truss 20...

   

Space Shuttle STS-112 Atlantis Space Station Assembly ISS-9A S1 Truss 20...



Δημοσιεύτηκε στις 23 Αυγ 2012
more at http://scitech.quickfound.net/astro/s...
http://scitech.quickfound.net/astro/s...

'JSC1941 - (2002)
Commander: Jeff Ashby
Pilot: Pam Melroy
Mission Specialists: Sandy Magnus, Piers Sellers, Dave Wolf, Fyodor Yurchikhin
Dates: October 7-18, 2002
Vehicle: Atlantis OV-104
Payloads: ISS Flight 9A: S1 Truss
Landing Site: Runway 22 at Kennedy Space Center, FL'

NASA film JSC-1941

Public
domain film from NASA, slightly cropped to remove uneven edges, with
the aspect ratio corrected, and mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization).

http://en.wikipedia.org/wiki/STS-112

STS-112
(ISS assembly flight 9A) was an 11-day space shuttle mission to the
International Space Station (ISS) flown by Space Shuttle Atlantis. Space
Shuttle Atlantis was launched on 7 October 2002 at 19:45
UTC from the Kennedy Space Center's launch pad 39B to deliver the
28,000 pound Starboard 1 (S1) truss segment to the Space Station. Ending
a 4.5-million-mile journey, Atlantis landed at 15:44 UTC on 18 October 2002 on runway 33 at the Kennedy Space Center's Shuttle Landing Facility.

During
the launch, the ET bipod ramp shed a chunk of foam that caused a dent
~4" wide and 3" deep into the metal SRB-ET Attach Ring near the bottom
of the left SRB. Prior to the next mission (STS-113), an upper-level
decision was made at NASA to continue with launches as scheduled. The
launch subsequent to that was the ill-fated STS-107.

Space
shuttle Atlantis had been scheduled to visit the International Space
Station (ISS) again on STS-114 mission in March 2003, however, due to
the shuttle Columbia disaster all space shuttles including Atlantis were
temporarily grounded. Due to rescheduling of missions Atlantis did not
fly again until STS-115 on 9 September 2006...

Starboard 1 (S1) truss segment

The S1 truss segment, which provides structural support for the Space Station radiators was the main payload of STS-112 mission.

Boeing
Company started constructing the truss in May 1998. The work was
completed in March 1999. The S1 was moved to KSC in October 1999 for
flight processing. Boeing delivered the S1 to NASA in June 2002 for
final preparations and pre-flight checks.
Crew Equipment Translation Aid

Atlantis
also delivered the Crew Equipment Translation Aid (CETA) Cart to the
Space Station. The CETA cart was attached to the Mobile Transporter
(launched on STS-110) to be used by assembly crews on later missions.
Mission experiments

STS-112
carried several science experiments to the space station including the
Plant Generic Bioprocessing Apparatus (PGBA), Commercial Generic
Bioprocessing Apparatus (CGBA), the Protein Crystal Growth Single-locker
Thermal Enclosure System housing the Protein Crystallization Apparatus
for Microgravity (PCG-STES-PCAM) and samples for the Zeolite Crystal
Growth Furnace (ZCG) experiment.

Shuttle processing

Launch
preparations for STS-112 mission were sightly delayed due to tiny
cracks found within the plumbing of Atlantis' propulsion system on 17
June 2002 by an inspector. The cracks were in metal flow liners inside
the main liquid hydrogen fuel lines that feed the shuttle's three main
engines. Although there were no cracks in the actual fuel pipes
themselves, the concern was that metal pieces from the flow liners might
break off and fly into the engines. In such a worst case scenario, the
debris can potentially trigger a catastrophic engine shutdown, which in
turn could lead to the loss of the crew and the shuttle...

http://en.wikipedia.org/wiki/Integrat...

The
Integrated Truss Structure (ITS) forms the backbone of the
International Space Station, with mountings for unpressurized logistics
carriers, radiators, solar arrays, and other equipment...

Δευτέρα 2 Φεβρουαρίου 2015

Fractal Flows and the Arrow of Time | Leonard Susskind

  

Fractal Flows and the Arrow of Time | Leonard Susskind





Δημοσιεύτηκε στις 25 Νοε 2013
Additional lectures by Leonard Susskind:

Inside Black Holes: http://youtu.be/yMRYZMv0jRE
ER=EPR: http://youtu.be/jZDt_j3wZ-Q
Working Group on Issues in de Sitter Space: http://youtu.be/o_tsxR1tjGo
Butterflies, Complexity, and Signals to Bob: http://youtu.be/94xgbhB_B_Q
Aspects of Eternal Inflation: http://youtu.be/xUZeZD9sytc

Find
more lectures by Stephen Hawking, Edward Witten, Jim Gates, John
Preskill, Joe Polchinski, Donald Marolf, and many more on my channel http://www.youtube.com/user/aoflex
----------------------------------------­------
Leonard Susskind
Stanford & KITP
Apr 04, 2012

'Fractal
Flows and the Arrow of Time' lecture given by Lenny Susskind at the
KITP Program: Bits, Branes, Black Holes (Mar 19 - May 25, 2012)

Coordinators: Vijay Balasubramanian, Alex Maloney, Don Marolf, Joan Simon
Scientific Advisors: Joseph Polchinski, Theodore Jacobson

Video can also be found here: http://online.kitp.ucsb.edu

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