Questions related to Modelisation
I'm working on Greenhouse Climate control Using the Fuzzy Logic Controller, so I'm searching for the mathematic model of Greenhouse structure, and the heater, cooler, and humifier transfer functions .
Is there any relationship between geologic or hydro-geologic domains (eg. sedimentary) and a range of rock strength or hardness?
Is it possible to rank geological domains on ranges of rock strengths?
I would like to calculate Fluidization minimum speed velocity (Umf) and Archimede Number for a continous air bed.
- volumic masses of gaz (=1,14 kg/M^3) and particule (=500kg/M3),
- viscosity of gaz (= 1.8**-5 Pa.s)
- diameter of particules (0,000484 m)
I can't know the porosity.
Also, I've determine experimentaly the Umf (0,4 m/s) . Now I would like to calculate it in order to extrapolate it with other particules types.
Does anyone knows what kind of formula I should use, or maybe an modelisation could be efficiant ?
many thanks in advance,
I am using MIDAS GTS NX to simulate an urban tunnel excavation with NATM method, the tunnel wizard option in the program allows to simulate the rockbolts but it does not allow to model the pre-reinforcement of the umbrella pipes.
should i create it manually or simualte it by inclined rockbolts !
has anyone done this model before ?
I am a PHD student , working on shape memory alloys modelisation using Ansys softwar.
I need to know and to understand the theorical part of ansys in dealing with SMA, wich equations did it uses? please share documentation if you have.
Dear colleagues, do you have any idea about the advances on phytochemistry especially the use of informatics for chemical studies, and biological activities molecular interactions modelisations, and is there any other applications of informatics on this field. Thank you
i have a mathematical model of the controller placement problem and i want to write a program using C as a language of programming,
this program he can find the optimal number of controllers that must installed in a Software Defined Network (SDN) and i don't know how to model the of switcher and the set of controllers in this program.
I'm working on earthquakes energy modelizations around faults under Windows 10.
Here's the problem: I need Coulomb to modelize shear / normal / coulomb stress, but it isn't (correctly) working on Octave (which's a free and open source equivalent of MATLAB, and that I've downloaded on my personnal computer at home; we only have MATLAB in the uni room).
Does anyone know a way to make Coulomb work properly on Octave, for a home-work situation? Or know an equivalent to Coulomb which would work well on Octave?
Or do I have to buy a MATLAB student license?
I thought of mailing my university to ask for a MATLAB student license, but the situation is administratively already quite complicated because of the COVID-19, so I tried to fend for myself and I couldn't find anything for the moment.
Thank you all!
my researches are about assasing impacts os xénobiotic on Daphnia magna but I would like to use modelesation and learning more about, can you help me to clarify or provide somme data about modelisation using daphnia as a model
Hello, i look for an example to model an energy management system for a building microgrid with hybrid renewable sources in matlab simulink or other software. I would be grateful to receive your proposal at: email@example.com.
Actually, I didn't know how to modelise the behavior of this hyperelastic layer when I'm simulating , the hyperelastic layer is incompressible I want to know how can I add a dynamic relaxation?
i want a precise description of BHA equipement and tools in oil and gas industry to find a way to modelise them in a databse .
already checked some articles and WITSML data description but couldn't figure out the necessary attribute in this industry.
thank's in advence
je cherche la modélisation de systéme biomasse ( gazification ) en MATLAB/SIMULINK , spécifiquemen simulink model of the gasifier et le Block diagram of the gasifier control system
I have 8 samples of Input/Output from which i should create a model of the system to control its output. Using the transfer function makes no sense for me because my data is stationary, the output depends only of the values of the input. How should I proceed in this case and what kind of modelisation fits the best?
Thank you in advance.
I wonder which of, calculation and computation, data analysis or modelisation is the more efficient for individual housing neighborhood under land shortage and profit based renewal unbalancing social infrastructure along with housing typology, engendering a significant gentrification.
I have a problem in the calculation of equivalent circuit of an FSS ring structure, it can be modelised by using an LC circuit, to calculate LC i use the hypothise of the mutual inductance between two parallel wire but it's not working according to the resonance frequency that i get by simulation (f0=1/2*pi*L*C).
i have a little experience in star ccm+ modelisation.
So now i have to modelize Panning hull in star ccm, to determine the drag,pression and trim....
My problem is to design a good "mesh" so i can have results that can be good enough.
Here, i saw a lot of publications about that, but i can't find none explicite about how to chose a suitable high of cells....
Another question is the type of cells: What is the best between the polyhedral and the trimmed mesh? (i often use the Trimmed mesh).
Thank in advance for your answers.
I took example over the example of GaAs junction in matlab to try to modelise my own laser. However i got the following error:
"Unknown function or operator. - Name: n_interp"
and i don't know what i could do to solve it.
Thank in advance.
I downloaded French language paper Modelisation de la rupture et de la reformation des films lubrifiants dans les contacts elastohydrodynamiques but my French isn't good enough to be able to understand tecnical data
The likelihood ratio test of comparing reduced model with full model differs by fixed factor result to chi-square distribution of zero degree of freedom.
/* reduced model */
proc mixed method = ml;
class block gen;
model rtwt = /ddfm = kr;
random block gen;
/* full model*/
proc mixed method = ml;
class block gen;
model rtwt = prop_hav/ddfm = kr;
random block gen;
There are 3 degree of freedom from reduced model - block variance, genotype variance, and residual variance. The same degree of freedom for full model with includes prop_hav as covariate. The difference in their -2 loglikelihood has zero degree of freedom under chi-distribution. Please could anyone guide me on how to compare these model to ascertain if the full modelis significantly different from reduced model.
c'est ma première participation, et mon premier travail de recherche,
J'ai besoin d'aides pour appliquer la méthode Pushover sur un barrage poids via le logiciel Sap 2000, surtout comment introduire les zones non linaires (joint de reprise).
une réponse généreuse détaillant les étapes à suivre pour modéliser un barrage poids est très souhaitable.
Je vous remercie d'avance.
I modelise a three point bending test on a a beam on ABAQUS. I used a linear displacement applied on a central edge on the top surface of the beam. In the viewing results, a sinking appears at the edge place. Is it correct to modelise a three-point bending load with a linear displacement ?
I did modelisation of an ultrasonic wave with FDTD 2D (Water-Bone).
I put a ponctuel source (velocity or stress) and I tried to capture the L wave or the S wave in another point of my simulation domain.
I have a coil tube (in which circulates a heating fluid at high temperature) embedded in a solid material bed at room temperature. Apart from heat transfer coefficients, which other parameters are relevant to describe heat and mass transfer?