The intensity integrated over a closed surface defining a source-free space compared to the sound pressure integrated over the same surface gives a measure of the capability of a specific intensity measuring system to suppress external noise.
Normally i.e., when set_source is used to define a source model expression the model to be used as the PSF convolution model must be defined as such with the set_psf command; however, it is not necessary in this case since we are manually defining the full source model expression using the set_full_model functionality, as shown in the next section of this thread.
To describe the source contributions to the total emission in the spectrum, we define a source model consisting of an absorbed power-law multiplied by an absorbed thermal plasma model, to describe the bright central point source and the surrounding diffuse thermal gas, respectively.
We have defined a source model expression for this simulation using an absorbed 1-D power-law model with a Galactic neutral hydrogen column density of 2×1021 cm-2 and a power-law photon index of 2. Simulating the Chandra spectrum means taking the defined model expression, folding it through the Chandra ACIS-S response, and applying Poisson noise to the counts predicted by the model.
Ideally, a case-control study should initially define a source population precisely, from which cases and controls are then randomly sampled.
A developer defines a source query in an external system, adds one or more transformations that manipulate data from a source query, and writes the results of the transformations to tables within the Medical Enterprise Data Warehouse.
This thread demonstrates the use of the set_full_model functionality for manually defining a complete source model expression for fitting spatial 2-D data, where one or more components are convolved by a PSF model, and others are not.
In order to apply the adjoint state of the Poisson equation in the resistivity inverse problem, we introduce an apparent electric field defined as the dot product between the computed electric field vector and a weighting factor and then defining a virtual source to compute the partial derivative of the electric field vector.
Lastly, both the interface and web services API support a mechanism to obtain a full mapping of all src_compound_ids between two data sources, by defining a "from" data source and a "to" data source.
