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 can solve the second order linear homogeneous partial differential equation with variable coefficients?

can someone help me with reduced the partial differential equation du/dt = - f(x) d^2 u/ dx^2 - g(x) du/dx --- (1) to become: du/dt = - p(x) d^2 u/ dx^2...

21 January 2021 3,296 1 View

IHC-paraffin experiment: how do you approach shopping for an antibody?

Hello everyone! I am shopping for an arginase 1 antibody to use for IHC-paraffin experiments with rat tissue. So far what I have understood is that if an antibody says it is reactive with rat,...

16 January 2021 794 3 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 explain insignificant independent variable which is significant with interacting (Moderation) variable?

10 December 2020 3,037 1 View

Dear all, Iam currently working on Dc Microgrid model for electrical vehicle charging. Can any body give good IEEE research paper on this topic?

please give any suggestion?

04 February 2021 4,837 5 View

Could you help me to find a research topic or something related to the Islanding detection on smart grid system?

06 January 2021 6,508 5 View

How to identify missing /bad data in PMU data?

PMU data can go missing due to several factors - faulty PMU or PDC or communication channel, cyber attack, etc. Bad data can be also caused due to some of the above reasons or maybe due to some...

28 December 2020 8,237 3 View

PDF of a Book?

Can anyone provide me the PDF for Distributed Energy Resources in Microgrids (Integration, Challenges and Optimization)?It would be really helpful

27 December 2020 8,015 3 View

Recommended Lithium-ion battery with BMS product for research and experiment purposes?

In my current research, I need to build an experimental electricity microgrid and one important part is the battery as energy storage, but I need your recommendation of which battery solution or...

25 December 2020 348 3 View

How can we set up Hydrothermal Liquefaction using solar/microgrid for extracting biofules?

Fo the conversion of biomass to biofuels, Hydrothermal Liquefaction is chosen.But the whole operation has to be from renewable energy source including the whole process most probably by solar and...

23 November 2020 9,432 2 View

How to reduce the spikes in DC bus voltage in a DC Microgrid?

I am working on a standalone DC Microgrid with PV and Battery with a load interfaced to a common DC bus through power electronic interfaces. The interface of battery is a non-isolated...

12 November 2020 3,108 4 View

Why battery always retain the same value of power?

Dear all, I have been testing a model that is in the Matlab library (https://es.mathworks.com/help/physmod/sps/ug/simplified-model-of-a-small-scale-micro-grid.html), this is named "power...

10 November 2020 2,117 3 View

How to tune pi controller for grid connected voltage source converter (space vector PWM) for dc bus voltage and current control in a DC micrgrid?

I have tuned the PI controller for the voltage control loop and inner control loop. But the problem is that it is not stable from a wide variation in the load/bus voltage. On the DC bus, there is...

16 October 2020 7,478 2 View

How to choose output capacitor for converters connected to a common dc bus of a SST based dc microgrid?

I am trying to integrate the low voltage dc bus of a solid state transformer(SST) with a dc microgrid. My SST and DC microgrid are operating fine individually. But when i try to connect all of...

11 October 2020 2,090 1 View