ACCESS module is designed as tool for
the preparation of data for the calculation modules, with which it
shares a common command structure. The components under study are
entered, and the specified database(s) are searched for all the
substances that are linear combinations of them. For even a small
number of components, the number of substances could run to several
hundreds and, since the calculation modules are normally configured to
handle a limited number of substances, some reduction may be necessary.
The databases will depend
on the installation.
allows the user:
exclude completely some substances from the datafile to be used by the
calculation modules, for example, those which are considered to be very
unlikely to be significant in a particular problem.
(b) to choose which data set is to be used for each
of the remaining substances on an individual basis, rather than on a
first found basis as in the preliminary database search.
(c) to select data for solution phases that use
(d) to identify phases likely to include miscibility
(e) to specify non-elemental components, retrieving
only those substances that can be formed from a linear combination of
the stipulated components and permitting a definition of the system
that is most consistent with its chemistry.
the status of unaries and phases for the system have been edited into a
form which satisfies the user, the data can be saved to a file which
can then be read by MULTIPHASE and the other
calculation modules. No printed output is generated by ACCESS:
a print-out of the file may be obtained, if required, via the
appropriate operating system command. It is possible to edit this file
manually but it is not recommended.
Brief summary of commands
DEFINE allows the user to define
system to be studied in terms of its components, which need not be
(b) the databases from which data are to be
(c) the output datafile to which data will be
subsequently written when the SAVE command is issued.
the system is executive, causing the databases to be searched.
LIST displays on the screen the current status of the
system in terms of which elements, substances, components and phases
CLASSIFY allows the status of individual phases or
substances to be classified
as NORMAL (present) or ABSENT from the calculation prior to SAVEing the
data for subsequent use by the calculation modules. The number
of miscibility gaps potentially present may also be specified
if they are to be taken into account in future calculations.
SAVE writes all data sets corresponding to substances
and phases with NORMAL or MISCIBILITY classifications to a datafile
specified in DEFINE OUTPUT_DATA_FILE, or to the default file if one has
not been specified.
RETURN takes the user out of ACCESS
back to the module level.
runs a macro taken from a file. The name of the file should be
entered in quotes. Commands can also be passed through to the
operating system by prefixing them with a $ (dollar sign). The
dollar sign and operating system command should be entered within
not strictly an option but is of special importance in ACCESS.
The setting of certain MTDATA configuration variables can modify
selection criteria and the manner in which data are saved to the
A gentle introduction gentle
introduction to using
the options available in ACCESS contains annotated
examples, each directed towards achieving a particular outcome,
showing typical combination of commands which would be necessary
to achieve that end.
A simple summary of the commands
available can also be used as an index to obtain more detailed
help about each command.