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  2. Limits of computation - Wikipedia

    en.wikipedia.org/wiki/Limits_of_computation

    Many limits derived in terms of physical constants and abstract models of computation in computer science are loose. [12] Very few known limits directly obstruct leading-edge technologies, but many engineering obstacles currently cannot be explained by closed-form limits.

  3. Transcomputational problem - Wikipedia

    en.wikipedia.org/wiki/Transcomputational_problem

    Exhaustively testing all combinations of an integrated circuit with 309 boolean inputs and 1 output requires testing of a total of 2 309 combinations of inputs. Since the number 2 309 is a transcomputational number (that is, a number greater than 10 93), the problem of testing such a system of integrated circuits is a transcomputational problem.

  4. Noisy-channel coding theorem - Wikipedia

    en.wikipedia.org/wiki/Noisy-channel_coding_theorem

    In information theory, the noisy-channel coding theorem (sometimes Shannon's theorem or Shannon's limit), establishes that for any given degree of noise contamination of a communication channel, it is possible (in theory) to communicate discrete data (digital information) nearly error-free up to a computable maximum rate through the channel.

  5. Bit error rate - Wikipedia

    en.wikipedia.org/wiki/Bit_error_rate

    The BER is the likelihood of a bit misinterpretation due to electrical noise ().Considering a bipolar NRZ transmission, we have = + for a "1" and () = + for a "0".Each of () and () has a period of .

  6. Ozone depletion is a separate problem caused by chlorofluorocarbons (CFCs) [233] which have been released into the atmosphere. [234] However, CFCs are strong greenhouse gases . [ 235 ] [ 236 ] Further, the hole in the ozone layer is shrinking and in 2019 was the smallest it had been since 1982, [ 237 ] [ 238 ] while global warming continues.

  7. Shunt (electrical) - Wikipedia

    en.wikipedia.org/wiki/Shunt_(electrical)

    For manganin, a common shunt material, at 80 °C thermal drift begins to occur, at 120 °C thermal drift is a significant problem where error, depending on the design of the shunt, can be several percent and at 140 °C the manganin alloy becomes permanently damaged due to annealing resulting in the resistance value drifting up or down.

  8. Sampling error - Wikipedia

    en.wikipedia.org/wiki/Sampling_error

    In statistics, sampling errors are incurred when the statistical characteristics of a population are estimated from a subset, or sample, of that population. Since the sample does not include all members of the population, statistics of the sample (often known as estimators ), such as means and quartiles, generally differ from the statistics of ...

  9. BMW i3 - Wikipedia

    en.wikipedia.org/wiki/BMW_i3

    Power delivery to the rear wheels was via a single-speed transmission. The li-ion battery pack was placed under the floor and could deliver an all-electric range of 160 km (99 mi). A 34 horsepower REX petroleum engine could be added to extend the car's range to 320 km (200 mi). [31] [32]