The software is able to plot data on several different diagrams, including a large number of classification and ´petro-tectonic´ plots. Petrograph gives the opportunity to manage large geochemical datasets in a single program without the need of passing from one software to the other as usually happens in petrologic data handling. Along with these basic functions, Petrograph comes with wide choice of modelling capabilities from major element mass balance calculations to the most common trace element and isotope models. Results and graphs can be exported as vector graphics in publication quality form or they can be copied and pasted within the most common graphics programs for further modifications. All these features makes of Petrograph one of the most complete software presently available for igneous petrology research.

Petrograph can be downloaded from the following URL : http://www.unipg.it/~maurip/SOFTWARE.htm

1980 Hoek E. and Brown E.T. 1980. Underground Excavations in Rock . London: Institution of Mining and Metallurgy 527 pages
Hoek, E. and Brown, E.T. 1980. Empirical strength criterion for rock masses. J. Geotech. Engng Div., ASCE 106(GT9), 1013-1035.

The original failure criterion was developed during the preparation of the book Underground Excavations in Rock. The criterion was required in order to provide input information for the design of underground excavations. Since no suitable methods for estimating rock mass strength appeared to be available at that time, the efforts were focussed on developing a dimensionless equation that could be scaled in relation to geological information. The original Hoek-Brown equation was neither new nor unique – an identical equation had been used for describing the failure of concrete as early as 1936. The significant contribution that Hoek and Brown made was to link the equation to geological observations in the form of Bieniawski’s Rock Mass Rating.]]>Persent Situationhttp://www.readwiki.com/blog/post/154.html#commenthttp://www.readwiki.com/blog/http://www.readwiki.com/blog/feed.asp?cmt=154http://www.readwiki.com/blog/cmd.asp?act=tb&id=154&key=4959ddc0verygeo@gmail.com (readwiki)http://www.readwiki.com/blog/post/150.htmlThu, 03 Sep 2009 16:31:27 +0800http://www.readwiki.com/blog/post/150.html Universitiesandcolleges.org have provided a very handy resource here. They've  sifted through the big OpenCourseWare universe and centralized the resources for over 500 college courses.This is the most comprehensive and up-to-date collection of free online college classes available to the general public. They'll be updating this list frequently, so please bookmark it for future reference. ]]>Persent Situationhttp://www.readwiki.com/blog/post/150.html#commenthttp://www.readwiki.com/blog/http://www.readwiki.com/blog/feed.asp?cmt=150http://www.readwiki.com/blog/cmd.asp?act=tb&id=150&key=c33e4953verygeo@gmail.com (readwiki)http://www.readwiki.com/blog/post/80.htmlTue, 21 Oct 2008 23:54:01 +0800http://www.readwiki.com/blog/post/80.htmlTthe PClass-CPT program^© reads and displays the results of Cone Penetration Tests (CPT). The results are used in estimating soil types and properties at each depth increment, and classify the soil accordingly......