How to get monthly average from data with 3 days or 1 week resolution?

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How can Gamma Ray API units be converted to CPS (counts per second)?

Oil and gas companies run gamma ray tool and take readings in API units while Gamma ray is also noted in cps, so how these units can be converted into each other?

24 February 2021 7,545 2 View

Is it possible that non-sea salt fraction has negative value?

Hi, I'm trying to calculate sea salt and non sea salt fraction from water soluble ion data (anion and cation). I calculate sea salt fraction by using using ssNa+ as specific marker and knowing the...

29 December 2020 9,813 9 View

When would you use a structural equation model?

I have read through different sources and answers before, and they have different views. What is the clear or concise thought beyond the reason for using SEM in the first place?

21 December 2020 4,228 3 View

DNA Extraction from old clot blood?

I want to separate DNA from human old clotted blood . I haven't any idea how to extract DNA from it. Your kind expertise and thought would be appreciated.

07 October 2020 7,871 2 View

How to do verification of the reaction steps of PCR conditions?

One of the reviewers in my submitted paper ask me for the "verification of the reaction steps of PCR conditions". how to argument to this comment, do i have to add reference or i have to verify...

09 September 2020 9,325 9 View

How do I edit a request?

I sent a request for an article to a professor at UPenn. This is my dream school and I was doing research on their Criminology department. But the request sent before I finished typing and so it...

13 August 2020 9,810 3 View

Can anyone share with me their protocol for Picric acid for Pico Sirius Red?

1) How do I dissolve the Sirius Direct 80 Red? I know it should be in saturated Picric acid solution. But how many grams of picric acid should I add to dissolve in water? What should the...

22 March 2020 233 3 View

Can Cochrane Risk of Bias tool be used to critique pilot/feasibility RCTs?

I have a couple studies that were classed as pilot RCTs that I'm not sure if they are suitable to be critiqued using the Risk of Bias tool (Cochrane) for a systematic review. My concern is the...

30 December 2019 2,550 3 View

How to test the statistical significance of the difference between a mean and a median?

For two quantitative data sets (One is normally distributed and summarized as means, while the other is not normally distributed and summarized as medians), how to test the statistical...

04 May 2019 6,391 18 View

How to determine quantitatively Cu and Zn in Brass alloy?

Dear all I am searching for a suitable method for the determination Cn and Zn in Brass alloy. I need a method for school grade level students, with out the use of instruments (AAS, Photometer...

04 April 2019 7,707 8 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

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

How the parameters (such as Mw, Chemical bonds, polymer bland and so on) affect the mechanic property of polymer (such as storage, loss modulus) ?

Anyone can recommend any books on such topics? Thanks in advance.

02 March 2021 8,457 2 View

What analysis to choose with a large neste dataset and clearly skewed or kurtotic distributions?

Hello! I have a dataset of n=3000 nested within 8 countries with approximately 200 or 400 responses in each country. I originally planned to perform multilevel modelling with 4 dependent variables...

02 March 2021 6,865 1 View

Why almost every element would be metallized in sufficiently high pressure and low temperature?

(This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

02 March 2021 3,309 2 View

Do you know any MR image dataset?

I would like to research on MR images (0.5T and 3T). Can you please suggest some websites that I can download dataset including both 0.5T and 3T MR images? Thank you.

02 March 2021 7,735 3 View

How Relativistic effects is one reason for lanthanide contraction?

The Lanthanide contraction which is the decrease in ionic radii of the elements in the lanthanide series from atomic number 57, lanthanum, to 71, lutetium, is due to poor shielding of the 4f...

01 March 2021 2,272 4 View

Can NFL theorem be valid in infinite search space in ML?

NFL theorem is valid for algorithms training in fixed training set. However, the general characteristic of algorithms in expanded or open dataset has not been proved yet. Could you show your...

01 March 2021 1,189 3 View

Ester cleavage conditions?

Hi all, I need to cleave the ester in Ethyl 2-amino-1H-imidazole-5-carboxylate to make the carboxylic acid and retrieve the product from solution to use in downstream applications of linking to...

01 March 2021 8,766 3 View

Ingo Riess

As a very simple approach, see the 1 week average as 7 days with the same reading. Same for the other values. And then take the average for the 30/1 days of the month. As air pollution typically changes with the weather, a fancy curve fitting will probably not get you a more valid distribution.

Carlos Mestanza-Ramón

Creería un media simple de todos los datos en el mes.

Agung Ghani

Thanks Ingo Riess and Carlos Mestanza-Ramón . I really appreciate your help. This is helpful.