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

I have a rock specimen and a soil specimen. During my mechanical measurements I observed that the rock reacts much faster on stress rate changes (observable by a sharp kink in the deformation...

09 October 2019 4,718 3 View

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

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View

Resistor definition in Piezoelectric bimorph with ANSYS workbench

Hello, good day! I am trying to simulate similar bimorph piezoelectric harvester with below commands. However, the output power doesn't change with resistor value. Please help to find the reason. ET,10,CIRCU94,0 !SET UP RESISTOR R,1,100000 !RESISTANCE VALUE TYPE,10 !SET ELEMENT TYPE E,1,2 !CREATE RESISTOR BETWEEN NODES 1 AND 2 Thanks in advance Regards,

02 March 2021 0 0 View

Is there a classification scheme for rock cavities or caverns with respect to their size and shape?

The range of forms and sizes of cavities in rock is very big. Is there a classification scheme for rock cavities regarding their size and shape?

02 March 2021 4,511 3 View