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  2. Spectral correlation density - Wikipedia

    en.wikipedia.org/wiki/Spectral_correlation_density

    This section describes the steps for one to compute the SCD on computers. If with MATLAB or the NumPy library in Python, the steps are rather simple to implement. The FFT accumulation method (FAM) is a digital approach to calculating the SCD. Its input is a large block of IQ samples, and the output is a complex-valued image, the SCD.

  3. Substation Configuration Language - Wikipedia

    en.wikipedia.org/wiki/Substation_Configuration...

    It describes the interfaces of one project to be used by another project, and at re-import the additionally engineered interface connections between the projects. It is a subset of an SCD file with additional engineering rights for each IED as well as the ownership (project) of SCL data. The last two file types were introduced with Edition 2.

  4. Slowly changing dimension - Wikipedia

    en.wikipedia.org/wiki/Slowly_changing_dimension

    The Start date/time of the second row is equal to the End date/time (or next) of the previous row. The null End_Date in row two indicates the current tuple version. A standardized surrogate high date (e.g. 9999-12-31) may instead be used as an end date so that null-value substitution is not required when querying.

  5. Change data capture - Wikipedia

    en.wikipedia.org/wiki/Change_data_capture

    The most common forms of SCD are type 1 (overwrite), type 2 (maintain history) or 3 (only previous and current value). SCD 2 can be useful if history is needed in the target system. CDC overwrites in the target system (akin to SCD1), and is ideal when only the changed data needs to arrive at the target, i.e. a delta-driven dataset .

  6. Calculation of radiocarbon dates - Wikipedia

    en.wikipedia.org/wiki/Calculation_of_radiocarbon...

    Activity levels, after being normalized to δ 13 C of -25‰, can be divided by this in order to calculate the "radiocarbon age". But as part of their methodology both beta counting and AMS measure standard samples containing carbon of a known activity, and the activity of the sample is divided by the activity of the standard. [8]

  7. Codes for electromagnetic scattering by spheres - Wikipedia

    en.wikipedia.org/wiki/Codes_for_electromagnetic...

    Codes which calculate exactly electromagnetic scattering by an aggregate of spheres in a single orientation or at an average over individual orientations. 2013 MSTM D. W. Mackowski [19] Fortran Codes which calculate exactly electromagnetic scattering by an aggregate of spheres and spheres within spheres for complex materials.

  8. Computation of cyclic redundancy checks - Wikipedia

    en.wikipedia.org/wiki/Computation_of_cyclic...

    Code fragment 5: Shift register based division, LSB first Note that the lsbit-first form avoids the need to shift string[i] before the xor . In either case, be sure to transmit the bytes of the CRC in the order that matches your chosen bit-ordering convention.

  9. Z-order curve - Wikipedia

    en.wikipedia.org/wiki/Z-order_curve

    The Z-ordering can be used to efficiently build a quadtree (2D) or octree (3D) for a set of points. [4] [5] The basic idea is to sort the input set according to Z-order.Once sorted, the points can either be stored in a binary search tree and used directly, which is called a linear quadtree, [6] or they can be used to build a pointer based quadtree.