This dataset consists of shear and bulk mechanical spectra for 2 liquids. 

The data were originally presented in: 

T. Hecksher, PhD thesis in physics, Department of Mathematics and
Physics (IMFUFA), Roskilde University, 2010. 
A pdf of the thesis can be found at:
http://glass.ruc.dk/phdprojects.php 
or
http://milne.ruc.dk/imfufatekster/

The data were later published in:

Tina Hecksher, Niels Boye Olsen, Keith A. Nelson, Jeppe C. Dyre, and
Tage Christensen 
Mechanical spectra of glass-forming liquids. I. Low-frequency bulk and
shear moduli of DC704 and 5-PPE measured by piezoceramic transducers
Journal of Chemical Physics, 138:12A543, 2013.

All experimental information can be found in these references.

This electronic version of the data was published on the "Glass and
time - Data repository" found at http://glass.ruc.dk/data

The authors have copyright to these data.  The authors have given
permission to "Glass and Time" to publish the data on the "Glass and
time - Data repository" web site.

You are very welcome to use the data for further analysis, but are
requested to cite the original publications whenever use is made of
the data in publications, presentations, etc.

Any questions regarding the data can be addressed to tihe@ruc.dk, who
would also appreciate a mail if you find the data useful.

____________________________________________________________________
The data format is defined as described below:

There is a directory for each sample. The name of the directory
corresponds to the abbreviations used in the original paper.

Each directory contains 9 data files:

(1) shearTemp.dat  :  temperatures in Kelvin corresponding to shear data. 
(2) bulkTemp.dat   :  temperatures in Kelvin corresponding to bulk data.

(1) and (2) are the temperatures at which the spectra have been
obtained.  Shear and bulk spectra overlap in temperature, but the
shear measurement can typically go to lower temperatures due to
technical issues (see paper and thesis for details).

(3) shearFr.dat    :  the frequencies in Hertz corresponding to the shear data
(4) bulkFr.dat     :  the frequencies in Hertz corresponding to the dielectric 

(5) shearRe.dat    : the real part of the shear modulus in GPa
(6) shearIm.dat    : the imaginary part of the shear modulus in GPa
(7) bulkRe.dat     : the real part of the bulk modulus in GPa
(8) bulkIm.dat     : the imaginary part of the bulk modulus in GPa

The files (5), (6), (7), and (8) contain the data. Each column
corresponds to a temperature; each row corresponds to a frequency.

For example: shearRe(n,m)+i*shearIm(n,m) is the total complex shear
modulus at temperature shearTemp(m) and frequency shearFr(n)

If a value in one of the 4 data arrays is NaN, it means that no data
is taken at this frequency/temperature or the data point was assessed
to be below the resolution limit.  This is, of course, at the same
points for the imaginary and real part, but not necessarily
simultaneously in shear and bulk modulus data.

(9) shearViscosity : the dc shear viscosities from FIG.11.

The files contain 4 columns: temperature, eta from TTS extrapolation,
eta from dc limit of complex viscosity (defined as eta=G/i\omega), eta
determined from the Helmholtz relaxator in the the PBG (bulk
transducer). If a value in one of the viscosity columns is listed as
NaN, it means that the method was not applicable at that temperature.


Beside the data files, plots of the data exist as png images for
reference. 


	   Last edited September 2013, Tina Hecksher