• negative permittivity of metals

    Updated: 2010-03-11 01:11:25
    Hi, It is seen that noble metals (gold, silver) show a negative permittivity in optical frequencies. Can somebody explain the physical interpretation of this phenomena? How is the negative...

  • The Bohr Model of the Hydrogen Atom

    Updated: 2010-03-11 01:03:21
    A hydrogen atom in an excited state absorbs a photon of wavelength 434 nm. What were the initial and final states of the hydrogen atom? E = hf = Eu - El = 2.825 eV That's the difference in...

  • Focus on Concepts, Question 10 - Three forces

    Updated: 2010-03-11 00:46:53
    *1. The problem statement, all variables and given/known data* Three forces act simultaneously on a 2.70-kg block. For clarity the drawings show the forces separately. The block starts from rest...

  • Matrix Elements

    Updated: 2010-03-11 00:42:14
    Well,

  • Real Analysis

    Updated: 2010-03-11 00:42:12
    Hi, I'm a high school student that has completed my most of my under division in mathematics (Diff. Eq., Discrete math, single/multi variable calculus, linear alg, problem solving, and basic group...

  • Simple question on non singular linear transformation

    Updated: 2010-03-11 00:37:35
    *1. The problem statement, all variables and given/known data* Given that "If T(Ta)=0, then Ta=0", can we say that the linear transformation on V is nonsingular? *2. Relevant equations* ...

  • magnitude of acceleration

    Updated: 2010-03-11 00:28:20
    What is the magnitude of the acceleration of a speck of clay on the edge of a potter's wheel turning at 48 (revolutions per minute) if the wheel's diameter is 34 ? I tried using V=2(3.14)r/T...

  • Finding the distance in an acceleration problem?

    Updated: 2010-03-11 00:15:06
    *1. The problem statement, all variables and given/known data* What distance is required to stop a car going 90km/h if the car can stop with an acceleration of -6.0m/s2? *2. Relevant equations*...

  • LC Patch Cord

    Updated: 2010-03-10 10:10:43
    We supply high quality LC Fiber Optical Patch Cord with competitive price.

  • ST to SC Patch Cord

    Updated: 2010-03-10 10:10:25
    We supply high quality ST to SC fiber optic Patch Cable with competitive price.

  • Simplex MU Patch Cord

    Updated: 2010-03-10 10:10:12
    We supply high quality MU fiber optic Patch Cable with competitive price.

  • MPO simplex Patch Cord

    Updated: 2010-03-10 10:09:55
    We supply high quality MPO fiber optic Patch Cord with competitive price.

  • 10/100/1000Base-T Ethernet Optical Fiber Converter

    Updated: 2010-03-10 10:08:58
    Featuring an “Industrial-Hardened” version for extreme environments,it is designed with modern Field Programmable Gate Array technology and operates efficiently even during high-demand traffic loads.

  • Cat6 Patch Cable

    Updated: 2010-03-10 10:08:38
    we supply premium quality Cat6 patch cable in custom colors and cable length and jacket types.

  • Fiber Optic Video Transmitter - 8 Channel Camera Video Fiber Optic Transmitter

    Updated: 2010-03-10 10:08:03
    Fiber Optic Transmitter,8 Channel Camera's Video Fiber Optic Transmitter,used for CCTV security surveillance.

  • Fiber Optic Video Transmission - 4 Channel Camera Video Fiber Optic Transmission

    Updated: 2010-03-10 10:07:44
    Fiber Optic Transmission,4 Channels Camera's Video over Fiber Optics transmission are typically used for CCTV security surveillance.

  • Fiber Optic Converter - 4 Video & 4 Audio Fiber Optic Converter

    Updated: 2010-03-10 10:07:35
    Fiber Optic Converter 4-channel Video & 4 Audio Fiber Optic Converter VOS-4400FFST/R,Ideal for CCTV audio and Professional AV applications

  • Bad Breath: Eitology, Diagnosis and Treatment

    Updated: 2010-03-10 00:00:00
    Conference: 15 Nov 2010, Institute of Physics, London, United Kingdom. Organized by IOP Publishing.

  • Perspectives on Photovoltaic Materials and Technologies

    Updated: 2010-03-10 00:00:00
    Conference: 30 Jun 2010, Institute of Physics, London, United Kingdom. Organized by The IOP Materials and Characterisation Group.

  • Wind Energy - Challenges for Materials, Mechanics and Surface Science

    Updated: 2010-03-10 00:00:00
    Conference: 28 Oct 2010, Institute of Physics, London, United Kingdom. Organized by the IOP Applied Physics and Technology Division.

  • IOP Superconductivity Group Summer Science Meeting

    Updated: 2010-03-10 00:00:00
    Conference: 5 Jul 2010, The Institute of Physics, London, United Kingdom. Organized by The IOP Superconductivity Group.

  • Electrospinning - Principles, Practise and Possibilities

    Updated: 2010-03-10 00:00:00
    Conference: 24 Nov 2010, Institute of Physics, London, United Kingdom. Organized by The IOP Polymer Physics Group.

  • Just a Frog on the Dissection Table

    Updated: 2010-03-08 16:51:00
    We’ve been studied. Bora points to a new paper by Inna Kouper in the Journal of Science Communication. The title is “Science blogs and public engagement with science: Practices, challenges, and opportunities,” which pretty much explains what it’s about. The author picks out a collection of eleven blogs — Pure Pedantry, Synthesis, [...]

  • The next wave

    Updated: 2010-03-06 06:20:47
    The New York Times has an article about stand-up paddleboarding. I guess that means it’s now officially mainstream? It’s weird to have seen a sport arise completely from scratch, over a period of just a few years. Five years ago paddleboarders were basically freaks. Now every break is teeming with them, and there’s a whole [...]

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