How can I find the null space of a matrix by using an optimization model?

As you know, the null space of a matrix A is the set of vectors that satisfy the homogeneous equation Ax=0. To find x (as the null space of A), I wrote two optimization models as below. I know,...

07 August 2019 8,468 20 View

How can I find the R&D Plan (Roadmap) of the 'power sector' of your country?

03 April 2016 865 6 View

What is the derivative of d[a(t) . y(t-1)]/dy(t)?

Hi, See the figure below, please.

10 November 2015 4,539 9 View

How can I highlight a cell of Excel sheet using MATLAB?

Hi, How can I highlight a cell of Excel sheet using MATLAB? Any help would be appreciated. Regards, Morteza http://mortezash.blogfa.com/

07 August 2015 3,350 7 View

How can I make an interface between Cadence and MATLAB?

Interface between MATLAB and CADENCE ------- I am going to make an interface between Cadence and MATLAB. How can I do it? Any help would be appreciated. Regards, Morteza Shabanzadeh

31 December 2014 8,367 2 View

What is the role of 'Nanotechnology' in the recent power system studies and applications?

I would like to know what the main role and importance of 'Nanotechnology' is in recent power system applications especially in the smart grid research studies. I believe that it will definitely...

31 December 2014 5,003 7 View

Can we ignore the O&M costs of wind power plants and PVs in comparison with their Capital costs?

I would like to know that is it possible to ignore the O&M costs in comparison with their Capital costs when we are going to find the optimal size of renewable energy sources such as...

11 December 2014 6,245 7 View

How can we practically curtail the surplus power/energy of a Wind Turbine in an isolated network?

Dear RG researchers, As you know, the power output of wind turbines is stochastic and thus it may occasionally be more than the local load. I think this is a controversial issue in the isolated...

09 October 2014 8,073 16 View

Technical and Economic Data for a typical Energy Storage System (ESS) (with the Capacity between 1MW up to 10MW)

Dear RG friends, I need "Technical and Economic data" of a typical Energy Storage System (ESS) or a small Pumped-Hydro System (PHS) (such as capital, operating and maintenance costs as well as...

08 September 2014 4,022 3 View

How can I transfer a 'SET' with high number of elements (entries) from GAMS into MATLAB using '.uels'?

Hello, I am going to transfer a 'SET' from GAMS into MATLAB. At first glance, it seems easy if the number of SET elements (entries) is low.For example, if the number of SET elements is five then...

07 August 2014 8,306 1 View

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 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

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

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 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

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