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

flexibility of polymers chain

effect of double bond on the flexibility of polymers

07 April 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

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View

12% ledeburitic cold work tool steel, etched for revealing retained austenite, any help for clarifying?

Hello everyone. Given microstructure image belongs to a 12% ledeburitic cold work tool steel (annealed and tempered). The sample was etched with picral (100 mL ethanol and 4 g picric acid). I...

02 March 2021 4,119 3 View

How Can I bring as much common elements in steel as possible to calculate stable phase(s) in OpenCalphad?

As I was tweaking step-by-step OpenCalphad6 Macros step1.ocm involving phase and thermal property calculation of a High-speed steel, I could not incorporate more than 6 elements in the steel...

01 March 2021 8,840 1 View

How can you bring two structures together to create an adhesive bond in LAMMPS?

I have created an Ice 1h crystalline structure and an Aluminium substrate structure and equilibrated both at 250K. Now I need to bring them together in a way that an adhesive bond is created....

01 March 2021 3,325 2 View

What is the density for pva electrospining?

I'm Juan Carlos, a high school student who is working with electropinning, I made an electropinning machine with a 21g needle and a 30kv high voltage source and the distance between my needle is...

28 February 2021 298 3 View

Is anyone familiar with the cyclic compressive fatigue testing (BS EN 12697 - 25) ?

I would like to get more information on the cyclic compressive fatigue testing (BS EN 12697 - 25) which is typically done for bituminous material in pavement design. Any one can advise on the...

28 February 2021 2,004 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

How to calculate Z (the number of molecules in a unit cell) for calculating theoretical density?

I am trying to calculate the theoretical density of my ceramics materials. I use the formula below to calculate the theoretical density: Theoretical density = (Molecular weight x No. of molecules...

24 February 2021 3,823 2 View