How do you recgznize a Permian locality based upon palynology or plant megafossils?

It would be interesting to know the decisive criteria.in recognizing Permian localities.

01 February 2017 9,848 0 View

In modern terms, was Charles Darwin, a biologist, geologist, or something else?

In his time, Charles Darwin was a naturalist who investigated many fields of science.

08 September 2016 5,783 6 View

What is the difference between a chemical signature and a chemical fingerprint?

I think that both terms have been used in the literature. Maybe they are the same concept but maybe not.

02 March 2016 9,864 1 View

What is the difference between precision and accuracy when you are looking at analytical data?

31 December 2015 4,937 3 View

Of all the great hypotheses of the 19th and 20th Centuries which one is the greatest, either in the geological sciences, physical sciences?

Justify your choice and indicate why it is the best.

11 December 2015 2,484 6 View

What are the most reliable ways of determining the paleoclimate during the Pennsylvanian (ex Late Carboniferous) and Permian?

02 March 2015 5,303 2 View

Have fungi been observed in the organic matter of Carboniferous coal balls?

Fungi are rare in Carboniferous coal where they are classified as the maceral funginite.

11 December 2013 9,154 2 View

How to classify strictly upper triangular matrices by similarity?

Let F be a field. Consider U, the set of n times n strictly upper triangular matrices in F. For X, Y in U, we call them similar if there exists some S, which is non-degenerate and upper...

01 March 2021 2,957 8 View

Is CD44 degraded in lysosome together with hyaluronan after CD44 mediated endocytosis of hyaluronic acid?

Also when RHAMM binds hyaluronic acid, they get internalized, will RHAMM also be degraded? Or both CD44 and RHAMM will be transferred back to the cell membrane? Asking for breast cancer cell line...

01 March 2021 8,169 2 View

Why is the sum of the elements in a row in a Q matrix equal to zero?

When explaining substitution models, the substitutions are expressed as Q matrix. Why is the sum of the elements in a row zero?

28 February 2021 3,864 3 View

Distribution of particles in metal matrix?

How would define the "good" and "poor" distribution of particles within the matrix. Is there a quantitative solution to assess the distribution of the particles, which then having denotation of...

28 February 2021 7,397 8 View

How to find a correlation between coordinates in a curvilinear coordinate system?

Hello. I have a skewed elliptical coordinate system (I use alternative elliptical coordinates). And I need to determine connections between coordinates in order to fetch a covariance matrix of...

28 February 2021 364 3 View

For modelling epoxy-based matrices (in composites), which model in ABAQUS is the most suitable, Concrete damaged plasticity or Drucker-Prager model?

I am working on developing a micromechanical FE model for predicting kink-band formation in UD composites. To model matrix plasticity, which model, out of Concrete Damaged Plasticity and...

28 February 2021 5,415 1 View

What are the methods used for CNT..?

Respected Professor's i hope you are doing well and happy. i need some information about carbon Nanotubes. before blending the CNT with the matrix the CNT has been introducing in some treatments....

24 February 2021 5,383 5 View

What is this fern?

Please help me to identify this fern species. Thank you in advance.

24 February 2021 2,435 5 View

How can I generate random samples from Bingham distribution in R? How can I construct those symmetric matrices?

in the function rbingham(n,A) in R software how can I construct that A (symmetric) matrix?

24 February 2021 3,528 3 View

Any references about insects or animals that can damage or weathering of rock or fossil material?

Are there any references to insects or animals that can cause damage or weathering to the rock or fossil material? books or paper that would be nice. Thank you very much!

24 February 2021 6,805 3 View