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  2. Foreign exchange controls - Wikipedia

    en.wikipedia.org/wiki/Foreign_exchange_controls

    restricting currency exchange to government-approved exchangers; fixed exchange rates; restricting the amount of currency that may be imported or exported; Often, foreign exchange controls can result in the creation of black markets in currencies. This leads to a situation where the actual demand for foreign currency is greater than that which ...

  3. Water–gas shift reaction - Wikipedia

    en.wikipedia.org/wiki/Water–gas_shift_reaction

    The initial HTS takes advantage of the high reaction rates, but results in incomplete conversion of carbon monoxide. A subsequent low temperature shift reactor lowers the carbon monoxide content to <1%. Commercial HTS catalysts are based on iron oxide–chromium oxide and the LTS catalyst is a copper-based.

  4. Spectral efficiency - Wikipedia

    en.wikipedia.org/wiki/Spectral_efficiency

    The link spectral efficiency of a digital communication system is measured in bit/s/Hz, [2] or, less frequently but unambiguously, in (bit/s)/Hz.It is the net bit rate (useful information rate excluding error-correcting codes) or maximum throughput divided by the bandwidth in hertz of a communication channel or a data link.

  5. Vietnamese units of measurement - Wikipedia

    en.wikipedia.org/wiki/Vietnamese_units_of...

    Originally, many thước of varying lengths were in use in Vietnam, each used for different purposes. According to Hoàng Phê (1988), [1] the traditional system of units had at least two thước of different lengths before 1890, [2] the thước ta (lit. "our ruler") or thước mộc ("wooden ruler"), equal to 0.425 metres (1 ft 4.7 in), and the thước đo vải ("ruler for measuring ...

  6. Impossible trinity - Wikipedia

    en.wikipedia.org/wiki/Impossible_trinity

    In terms of the diagram above (Oxelheim, 1990), the options are: Option (a): A stable exchange rate and free capital flows (but not an independent monetary policy because setting a domestic interest rate that is different from the world interest rate would undermine a stable exchange rate due to appreciation or depreciation pressure on the domestic currency).

  7. Volumetric flow rate - Wikipedia

    en.wikipedia.org/wiki/Volumetric_flow_rate

    Volumetric flow rate is defined by the limit [3] = ˙ = =, that is, the flow of volume of fluid V through a surface per unit time t.. Since this is only the time derivative of volume, a scalar quantity, the volumetric flow rate is also a scalar quantity.

  8. Exchange-rate pass-through - Wikipedia

    en.wikipedia.org/wiki/Exchange-rate_pass-through

    Exchange-rate pass-through (ERPT) is a measure of how responsive international prices are to changes in exchange rates. Formally, exchange-rate pass-through is the elasticity of local-currency import prices with respect to the local-currency price of foreign currency.

  9. Catalytic converter - Wikipedia

    en.wikipedia.org/wiki/Catalytic_converter

    In the United States, it is a violation of Section 203(a)(3)(A) of the 1990 amended Clean Air Act for a vehicle repair shop to remove a converter from a vehicle, or cause a converter to be removed from a vehicle, except in order to replace it with another converter, [33] and Section 203(a)(3)(B) makes it illegal for any person to sell or to ...