Do stiff mechanical systems (e.g. rock) react faster on stress rate changes than soft systems (e.g. soil)?

More Christian Ungewitter's questions See All

Is it valid to build climate models based on natural data?

Climate models are validated and checked on historical climate data. With these climate models it is aimed to predict the climate change induced by human actions. But is this a valid procedure?...

01 February 2019 3,466 4 View

Is there a recommended book or overview article on artificial neural networks?

I'm new to the topic and I want to have a first and broad overview on questions concerning: What is an artificial neural network? What can they do? How do they work? What types of ANNs do exist?...

05 June 2017 3,778 12 View

Is there a free Excel addon or Excel sheet which allows the conversion of normal distributed datsa into lognormal distributed data?

I am searching for a free Excel addon or Excel sheet which allows the conversion of normal distributed datsa into lognormal distributed data.

31 December 2016 7,110 4 View

Is it possible that corrosion takes place in an oil environment?

I think that I have problems with corrosion on a workpiece of stainless steel, but I'm not sure.

11 December 2016 3,569 3 View

Is there a good reference (paper or book) for the topic osmosis?

I am searching for a good reference for osmosis from a physico-chemical/thermodynamical point of view. The publication must provide a general introduction to osmosis based on the chemical potential.

07 August 2016 9,295 3 View

Is there any open source plot digitizing software?

I want to extract data points from a scanned graph. But all software I found was not for free.

06 July 2016 4,227 1 View

Is there a technique to measure the mechanical stress inside a material without contact?

I think of X-ray techniques, applications of magnetic fields or something in this direction.

06 July 2016 7,984 7 View

Are there publications about the application of multiple point geostatistics on mudrocks, argillte, oil shales and so on?

I would like to know if somebody tried to model the pore connectivity and pore size in mudrocks with multiple point geostatistics.

05 June 2016 3,977 0 View

Recognition of pore water distribution by ESEM?

Is it possible to determine the pore water distribution or to visualise the pore water in a mudrock or shale with an environmental scanning electron microscope?

02 March 2016 7,530 6 View

Are there recommended settings (rotational speed, drift) for overcoring a mudstone in a lab?

I want to overcore a drilled specimen from the field for triaxial testing. Now I need appropriate settings for the overcoring machine to get (nearly) undisturbed mudrock specimen.

01 January 1970 8,019 2 View

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View

Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence?

I am on the lookout for the Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence. Does anyone know where I can find it? Thank you in advance

03 March 2021 3,568 1 View

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Hi, I want to start testing pitfall trap to obtain ants samples, but I need to conduct molecular analysis on those insects. So, what kind of fluid can I use? Ethanol expires too early and I need...

03 March 2021 5,978 5 View

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View

Do we need to write protocol for a second study of a systematic review that has been registered and published?

I have conducted and published a systematic review and meta-analysis research with the topic related to public health and health pomotion (protocol was registed in PROSPERO). Now we want to...

03 March 2021 8,920 3 View

How to increase a model accuracy ?

dear community, my model is based feature extraction from non stationary signals using discrete Wavelet Transform and then using statistical features then machine learning classifiers in order to...

03 March 2021 6,994 5 View

How the parameters (such as Mw, Chemical bonds, polymer bland and so on) affect the mechanic property of polymer (such as storage, loss modulus) ?

Anyone can recommend any books on such topics? Thanks in advance.

02 March 2021 8,457 2 View

Do I need to do linear regression before running mediation analysis using PROCESS MACRO by Hayes ?

I just wanted to check if I need to run a linear regression separately if I am using PROCESS MACRO to run mediation analysis. Thank you.

02 March 2021 4,359 3 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

02 March 2021 4,910 3 View

Sample dilution for quantitative analysis using ELISA?

If the detection range is in ng/ml but the reference range is in ug/ml for a molecule or protein in serum or plasma .how to dilute and what is the initial volume to be taken for quantitative analysis

02 March 2021 7,670 3 View

Victor J. Аdlucky

The first thought is that elastic waves propagation takes place. Corresponding velocities are proportional to sqrt of elastic moduli. See, for example, https://petrowiki.org/Compressional_and_shear_velocities

Christian Ungewitter

Thank you for your answer. But I forgot to mention that my question relates to a static load.

Fotseu Miyo Christian Dupont

Hi, a consolidated material like a weakly cracked rock under a relatively low stress increase, the deformation is faster than that of a soil which takes time under the effect of the constraint, to close the cracks which it comprises; likewise for a highly cracked rocky material.