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

Dose any one know that why the different papers have used different concentration of paraformaldehyde (0.5%, 4%, ...) for blastocysts fixation?

We are going to assay apoptosis in mice blastocysts with TUNEL assay kit, but we observed that different papers have used different concentration of PFA such as 0.4%, 0.5%, 2%, 3.7%, 4% with...

13 July 2018 1,733 2 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 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

What is the most Operating System (OS) which can be INSTALL on Tiny hard devices like Raspberry Pi (RPi) hardware ?

I'm targeting to deploy a mesh network and manually configure MANET routing protocols. I'm preparing scenarios, architectures, and hard devices needed to do that. Are there some step-by-step...

03 March 2021 1,931 5 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

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

After a reference from Int J Body Compos Res, can any body help?

Hi, I am after the reference below, my library says it cannot obtain a copy either locally or internationally, any help appreciated! Chris Wang ZM, Heshka S, Wielopolski L, Pi-Sunyer FX, Pierson...

03 March 2021 6,193 1 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

What techniques can I use to determine the miscibility of polymer blends?

The term miscibility refers to the single-phase state in thermodynamics. I do not mean the compatibility of different components. To determine the miscibility I know several techniques such as...

03 March 2021 4,107 4 View