Guide to STN Patent Databases – Basic Version - Paton - TU Ilmenau

19.3.1 Semantic enrichment
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Guide to STN Patent Databases
For semantic enrichment this basic algorithm is performed:
Correct identification of numbers and units:
-ray diffraction
were in the range of 10 to 30 nm. Fig. 1 shows typical nano
particles in a sample milled for 6 hours. In a second experiment
a 1 litre
addition it is widely accepted that the existence of a so-called
'limiting particle size' limits the practical minimum particle
size that can be attained by grinding to values greater than
100nm
There are both exact numeric values and closed and open intervals. The units are sometimes written out,
sometimes abbreviated, and they are appended to the respective number with or without a space. The
empirical formula and the reference to Fig. 1
Extraction of values and their respective units:
10 nm
30 nm
6 hours
1 liter
100 nm
Conversion to basic SI units:
10 nm = 1,0 x 10 -8 m
30 nm = 3,0 x 10 -8 m
6 hours = 2,16 x 10 4 s
1 litre = 1,0 x 10 -3 m 3
100 nm = 1,0 x 10 -7 m
The data found can be searched in the context of the original document:
As exact values or in intervals
In combination with keywords
Using proximity operators
In various units
The algorithm is able to identify and process a total of 35 SI units 1 in 396 different units and writings. For example
feet and other units of the imperial system are identified and converted to their metric equivalents.
19.3.2 Searchable physical quantities
The table below lists the searchable physical quantities together with the respective units and search fields tob e
used:
1 Strictly speaking, only metre, kilogram, second, kelvin, mole and candela are SI basic units. Others, such as cubic
metre, mole per litre, Joule or Newton are derived units; they are derived from the basic units. Others again, such as
bit and byte or percent are not part of the Système International at all.