Selecting particular columns from large datasets (csv) using R Studio?

So I have large number of csv files (100+) in a directory with same structure and column names. The data is in time series and there are approx 30 columns/file. However i only want to aggregate...

08 February 2021 245 5 View

How much pre-PCR dilution of mixed-template DNA extracted from pollen (honey) is appropriate for Metabarcoding?

I'm working on pollen DNA metabarcoding to identify the floral composition of honey. How much pre-PCR dilution of mixed-template DNA extracted from pollen (honey) is appropriate for the...

28 December 2020 9,132 1 View

How to add two vertical and parallel Fresnel reflection coefficients to retrieve overall reflection coefficient for a right hand circular wave?

I have a problem in which a right hand circular polarized wave (GPS wave) encounters an ideal smooth plane obliquely, and then is reflected off that. To solve this kind of problems, the wave is...

28 December 2020 2,271 3 View

Which is better to focus on teaching or research for a good academic life and Why?

Which is better to focus on teaching or research for For a good academic life and Why?

26 December 2020 5,737 9 View

Is ag paste suitable for back contact on silicon wafer? or i should deposit al on the back surface using pvd or plasma sputtering?

Fabricating silicon solar cell

22 December 2020 4,906 7 View

Which renewable source is the best ?

wind hydro solar etc.

21 December 2020 6,360 16 View

Why is light pure energy?

light is pure because the light is the simplest electromagnetic construct but the energy of any object is also of the same kind.

20 December 2020 207 4 View

How to handle Missing Values for Skipped Questions (Systematic Missing) in R ?

10 December 2020 435 4 View

What is the best industrial emulsifier to make silicon oil in water emulsion?

I need to make long-lasting stable emulsions of 6 wt. % percent silicon oil in DI water. The previousely made emulsions using Tween and Span Emulsifiers did not remain stable after a week.

31 October 2020 3,568 3 View

Carbon Emission calculation factors ?

I am thinking about writing a paper on carbon emissions based on electricity consumption data from some buildings. From a research perspective, which factors should i specially focus while...

09 October 2020 4,142 3 View

Is stone a sustainable material? Is it a sustainable approach to use natural stone waste in architecture?

I'm designing a zero-waste restaurant and considering using marble waste to make some tables and a bar countertop. My clients think it's not "sustainable enough" and I would like to have more...

01 March 2021 4,326 7 View

Which DL architecture is better to work on handwritten data?

I am working in the area of Handwriting recognition for Bangla. As there are many DL architecture, I am confused which one to select.

15 February 2021 4,996 1 View

PV system design. 3d modelling and Analysis?

I have been looking for a good cost-effective tool for 3D modelling a glass-glass solar module system. I was initially considering Skelion as a tool but it does not look very promising, a bit...

13 February 2021 8,126 1 View

Useful architecture for bioinformatics?

Hi Dear researchers In ensemble-based architectural design Which algorithms are more useful for classification? What is the difference between parallel and ensemble architecture? Thanks I am...

08 February 2021 2,727 5 View

Do you need permission to use a middle range theory in your dissertation?

I am using a figure of a middle range nursing theory, do I need permission to use?

03 February 2021 2,210 9 View

What will be the impacts of post covid-19 stress on working nurses?

The health and well-being of nurses are essential to the quality of care that they provide for people and communities. The Covid-19 pandemic has put them under unprecedented pressure. The impact...

26 January 2021 2,440 20 View

Hello, my name is siti. My question is what is the related issue in bone marrow transplant or hematology that I can choose for my research project ?

I am doing a master in nursing but still does not have any idea about what topic I am going to choose. pls help

25 January 2021 1,097 12 View

Why should we use Sustainable climate design?

Sustainable design is a set of cognitive and analytical abilities, knowledge of the environment and ample practical to incorporate things into the world of microbes, plants and animals, and the...

25 January 2021 7,816 8 View

(ORGANISATIONAL FACTORS ) request for study instrument?

i am currently conducting a study to assess bullying behaviors on student nurses during clinical placement . My objective is to explore organisational factors that influence bullying behaviours at...

25 January 2021 8,676 1 View

Any good (up-to-date) CUDA programming book?

I've been looking for a decent and up-to-date book about CUDA programming, yet it has turned out to be more difficult than I expected. So far I've used CUDA by example (from Sanders & Kandrot)...

21 January 2021 7,771 4 View