Why we calculate difference between precipitation and potential evapotranspiration?

Hi in SPEI drought Index, we calculate difference between precipitation and potential evapotranspiration, why? who Knows?

12 November 2019 7,833 4 View

Flood Inundation in HEC-RAS?

Hi, I am using HEC-RAS 5.0.7 to create Inundation Boundary, however, it seems HEC-RAS extends flood inundation boundaries up to Edge Lines (two sides of cross sections) and then shows the vertical...

27 October 2019 5,722 10 View

What is time, t or ct?

One of the consequences of relativistic physics is the rejection of the well-known concepts of space and time in science, and replacing them with the new concept of Minkowski space-time or simply...

16 August 2019 4,563 85 View

Is there any effect of dark matter on the orbital speed of the Sun around the centre of the Milky way?

I have found two different results for the effect of dark matter on the orbital speed of the Sun. One from Wikipedia suggests there is no effect while another one from astronomynotes suggests...

15 February 2019 9,533 23 View

What is the best Machine Learning tool for time series analysis of physical-based simulations?

I am looking for a Machine Learning tool for Time series analysis. I have tried MATLAB (ANFIS tool) and ANN in R, but the error is more than my expectation in testing step. Furthermore, MATLAB...

07 December 2018 6,306 4 View

How long does it take for an OMG particle to travel one light year?

The obvious answer is one year as the speed of the oh-my-God (OMG) particle was calculated to be about 0.999,999,999,999,999,999,999,995,1c. However, at this speed, from the frame of the...

21 August 2018 5,636 49 View

How many fundamental mistakes a theory must have before it is forever banned from the classrooms?

In reference to the three attached articles in which it is shown that The theory of length contraction and time dilation are based on a simple oversight. When analyzing the Michelson & Morley...

08 May 2018 2,010 7 View

Does Michelson and Morley experiment support length contraction?

24 September 2017 7,272 86 View

Whould you please help me and say the best way for extraction RNA from panonychus citri by trizol?

I wanna to extract RNA in best way from Panonychus citri by trizol please say me what is the best way for good result?

03 June 2017 8,744 1 View

How can I extract nicotine in good yield from tobacco (and the good way for determination of it in extraction)?

How can I extract nicotine in good yield from tobacco (and the good way for determination of it in extraction)?

28 January 2016 468 3 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

flexibility of polymers chain

effect of double bond on the flexibility of polymers

07 April 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

Formulation of polymer color flakes

I am writing to request some information for making polymer color flakes. I would appreciate the help.

17 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