PRECISION PREFERENCES

Precision preferences are used by the various 'Resources' tools to fine tune the accuracy of the results you want them to match. Those tools often allow you to input numeric figures for a database comparison. The options here assist the tools by determining how precise a match should be made against the actual database figures. If these options are disabled, the database will respond by matching the exact provided figure submitted by you. The database is very accurate in what it allows as a positive match. For example, if you want to match a database figure of 3.1 and the actual value in the database is 3.11, you search will be discredited since 3.1 is equivalent to 3.10 and not 3.11. This can be a blessing or a curse, depending on your confidence towards your data’s accuracy. In order to grant you a choice in search flexibility, the options below allow you to set a margin of error so as to match a wider range of values. On the aforementioned example, your match will return a positive if you set a margin of error at 0.01.

All the options in precision look and function in a similar manner. Each option has toggle that you can activate to enable a slider below it. The slider can be moved to set your margin of error, bound by its limits.

• Putting your phone in landscape mode will allow greater accuracy when setting your margin of error due to the larger footprint of the slider.

Once activated, the database search algorithms will use the numerical figure pointed on the slider as the margin of error when searching. That is, for your submitted figure x and margin of error y; the database will match for all figures that satisfy the (x – y) < x < (x + y) clause. Discussed below are the options included…

Molecular weights:

Toggle this option to set the margin of error when performing a molecular weight search. This is only applicable to the 'Composition resource tool' while using its Search weight function. The error limits are between 0 and 10. This option is enabled by default with a margin of error set at 0.5.

Vickers hardness:

Toggle this option to set the margin of error when performing a Vickers hardness search. This is only applicable to the 'Physical resource tool' while using its Vickers hardness function. The error limits are between 0 and 1. This option is disabled by default.

Measured density (S.G):

Toggle this option to set the margin of error when performing specific gravity/measured density searches. This is only applicable to the 'Physical resource tool' while using its Specific gravity function. The error limits are between 0 and 0.2. This option is enabled by default with a margin of error set at 0.01.

Calculated density:

Toggle this option to set the margin of error when performing a calculated density search. This is only applicable to the 'Physical resource tool' while using its Calculated density function. This option is enabled by default with a margin of error set at 0.01.

Refractive Indices (R.I.):

Toggle this option to set the margin of error when searching for refractive indices. This is only applicable to the 'Optical resource tool' while using any of its three refractive index text fields. The error limits are between 0 and 0.2. This option is enabled by default with a margin of error set at 0.01.

Birefringence:

Toggle this option to set the margin of error when performing an optical birefringence search. This is only applicable to the 'Optical resource tool' while using its Birefringence function. The error limits are between 0 and 1. This option is disabled by default.

Crystallographic axes:

Toggle this option to set the margin of error when matching unit cell crystallographic axes. This is only applicable to the 'Crystallography resource tool' while using any of the three crystallographic axes (a, b or c). The error limits are between 0 and 2. This option is enabled by default with a margin of error set at 0.4.

Unit cell angles:

Toggle this option to set the margin of error when matching unit cell angles. This is only applicable to the 'Crystallography resource tool' while using any of the three unit cell angle functions (alpha, beta or gamma). The error limits are between 0 and 2. This option is enabled by default with a margin of error set at 0.2.

Unit cell volume:

Toggle this option to set the margin of error when performing a unit cell volume search. This is only applicable to the 'Crystallography resource tool' while using its Volume function. The error limits are between 0 and 10. This option is enabled by default with a margin of error set at 0.1.

Unit cell density:

Toggle this option to set the margin of error when performing a unit cell density search. This is only applicable to the 'Crystallography resource tool' while using its Density function. The error limits are between 0 and 1. This option is disabled by default.