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

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Can any one help me on how to make a questionnaire to determining the effect of physical and social factors to place attachment? #place_attachment #public_space #physical_factors #social_factors

31 July 2019 2,465 1 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

How can batteries at customer ends (commercial, industrial and residential) help the demand response program?

batteries at customer ends mainly contribute in self-consumption and bill management. Shifting the load to the low-tariff price duration might cause a ramp-up in demand profile in lower tariff...

15 December 2018 4,389 1 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 important are the "behind-the-meter batteries" for demand profile improvement in power system?

considering the high capital costs of the BTM batteries in smart grid, even at customer ends, as well as their limited life cycles, is it economically suggested to use these storage devices for...

30 November 2018 2,880 7 View

MTT assay problem - why treated samples gave the similar results?

05 September 2018 4,897 10 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

Are there any papers that deal with the effects of climate change on the pollination in Tropical orchids?

There are a few papers dealing with the effects of climate change on the pollination of European orchids, but I wonder if similar studies have been carried out in the Tropics.

04 February 2021 1,818 4 View

Does the subsoil have an effect on the spread of weeds whose roots are more than 35 cm deep?

For weeds whose roots deepen more than the level of subsoil, they may be affected by this layer, for example, determined by height and growth, as well as limited to flower production and seeds.

01 February 2021 1,940 4 View

How to determine the genetic potential of the genotype in terms of fruit size and weight?

In addition to genetic and environmental factors, fruit size is also influenced by crop load, rootstock, orchard planting system/tree training system, pollination, water and nutrient management,...

13 January 2021 9,309 4 View

Time taken from pollination to fertilization in solanaceous crops?

How much time is required from germination of pollen grain on stigma to fertilization in Solanaceous crops (chilli, tomato, brinjal)?

26 December 2020 887 5 View

R script statistics - Effect of 2 variables on another?

There is data about the location and characteristics of plots of Oilseed Rape on several farms, as well as the relative abundance of different pollinator species counted at each plot. The...

25 November 2020 3,203 1 View

Is there a database of photos with insect pollinators on flowers of plants?

I would like to know if there is a database of photos with insect pollinators on flowers. The insects must be located on flowers of plants. I am interested in pollinators encountered in Europe,...

04 November 2020 2,219 6 View

Can anyone help me understand how to adjust my SAS glm analysis to include a random effect for site?

I am not great with statistics so please be understanding. I have 17 pollinator sites that I collected data from and am comparing the effect of habitat type (2 classes) on several different...

24 September 2020 3,140 5 View

Can anybody identify and advise on holoparasitic plants living inside cacti?

Four cacti in our conservatory carry holoparasitic plants inside them which have flowered or are still flowering this year. They appear to be two species. Can anybody answer these questions: -...

24 September 2020 9,749 3 View

What is the preference between biological incolation and organic fertilization?

Which one is more compensated for the lack of major elements NPK in the soil, is it biological pollination or organic fertilization and how much are those ratios?

22 September 2020 9,386 3 View

Is this typical lymphocyte, the flower cells?

21 September 2020 4,107 3 View