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  2. Aromatic ring current - Wikipedia

    en.wikipedia.org/wiki/Aromatic_ring_current

    A diagram of an aromatic ring current. B 0 is the applied magnetic field, the red arrow indicating its direction. The orange ring shows the direction of the ring current, and the purple rings show the direction of the induced magnetic field. An aromatic ring current is an effect observed in aromatic molecules such as benzene and naphthalene.

  3. Charge carrier - Wikipedia

    en.wikipedia.org/wiki/Charge_carrier

    Free carrier concentration is the concentration of free carriers in a doped semiconductor. It is similar to the carrier concentration in a metal and for the purposes of calculating currents or drift velocities can be used in the same way. Free carriers are electrons that have been introduced into the conduction band (valence band) by doping ...

  4. PBS - Wikipedia

    en.wikipedia.org/wiki/PBS

    As of March 2015, PBS maintains current memberships with 354 television stations encompassing 50 states, the District of Columbia and four U.S. possessions; [4] [69] as such, it is the only television broadcaster in the United States—commercial or non-commercial—which has station partners licensed in every U.S. state (by comparison, none of ...

  5. Buy one, get one free - Wikipedia

    en.wikipedia.org/wiki/Buy_one,_get_one_free

    The economist Alex Tabarrok has argued, that the success of this promotion lies in the fact that consumers value the first unit significantly more than the second one. So compared to a seemingly equivalent "Half price off" promotion, they may only buy one item at half price, because the value they attach to the second unit is lower than even the discounted price.

  6. Charitable remainder unitrust - Wikipedia

    en.wikipedia.org/wiki/Charitable_remainder_unitrust

    A charitable remainder unitrust (known as a "CRUT") is an irrevocable trust created under the authority of the United States Internal Revenue Code § 664 [1] ("Code"). This special, irrevocable trust has two primary characteristics: (1) Once established, the CRUT distributes a fixed percentage of the value of its assets (on an annual or more frequent basis) to a non-charitable beneficiary ...

  7. Mobile number portability - Wikipedia

    en.wikipedia.org/wiki/Mobile_number_portability

    However, the UK and India have a different system known as "donor-led" porting. In these countries, you first need to contact your current network (the donor) to get a special code a Porting Authorization Code (PAC) in the UK or a Unique Porting Code (UPC) in India—which is to be submitted to the recipient network. The recipient continues the ...

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