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Simulations & Solvers

269 Topics 800 Posts

FDTD, Low-Frequency, Neuron, Mode-Matching, Flow, Acoustics, etc...

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  • FDTD, Low-Frequency, Neuron, Mode-Matching, Flow, Acoustics, etc...

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    16 Topics
    39 Posts
    G
    Hi, I'm trying to simulate a synapse between two identical neuron models, imported from the same .hoc file. I set the simulation as follow (see screenshot): -both neuron have the same HOC Model Settings -The first neuron "L23_PC_cADpyr229_1", pre-synaptic, has an IClamp on its soma -The second neuron "L23_PC-cADpyr229_2", post-synaptic, has a Exp2Syn point process on dendrite 9 -The network connection was created drag & dropping the first neuron's model and the Exp2Syn point process of the second neuron in the network connection settings [image: 1778756649765-f7472fbe-2fe9-4244-9297-34d7a1f29c16-image.png] If I try to run the simulation I get the error messages: Simulation : [Error] Failed to create neuron group ids. Error : Failed to write the input file Error : Unable to start simulation: failed to write input files. How can I solve this error? I already tried using different neurons from different .hoc files. Thank you in advance
  • R

    Can I make the animation of radio waves(EM E(x,y,z,f0))?

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    R
    @Sylvain It really helped!! I've successfully done making animation!! Thank you for helping me. Since you also gave me some advice about TRP problems, I would like to carry on the solutions you suggested. I really appreciate your help.
  • R

    Why TRP exceed input power

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    A
    duplicate of (https://forum.zmt.swiss/topic/337/why-does-trp-exceed-input-power-antenna)
  • S

    Axon getting stimulated even with atto Amps of current !!

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    S
    @habib Hi, Thank you for your reply. I can understand that if you enable the titration, the software keeps on scaling the field till sees a stimulation. But it also gives us a number for the scaling field. In this case, I am seeing that number to be 0.13. Doesn't it mean that the field has been scaled down to a factor of 0.13 to create the minimum field for stimulation - I was hoping that number to be orders of magnitude higher. Please correct me if I am wrong. Thanks for looking into this.
  • S

    Simulating a bipolar electrode with contant power

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    S
    Hi, There is a tutorial called "Parallel Plates" for the LF (low-frequency) solver. I think it does exactly what you need. You can access the step-by-step instructions from Sim4Life -> Help -> HTML Tutorials -> 3.2.1. Parallel Plates You can also open the Sim4Life project using Sim4Life -> File -> Open Tutorial -> EM LF Tutorials -> Parallel Plates.smash
  • A

    2 Coils: Single or multi port?

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    S
    Hi Ari, It depends on your purpose. If you use single port simulation, then, you cannot later change the phase difference between the coils. However, if you use multiport simulation, Sim4Life runs 2 simulations for each coil and stores the results separately. This is useful if you would like to postprocess results for different source parameters. For example, you may change the current amplitudes for each coil, or add phase differences. You do not have to run the simulations again. New results will be directly calculated by using the previously stored multiport results. So, if you have enough memory and would like to try different settings for the sources, you had better to use multiport simulation for the above setup. If you want to save time and memory and fixed the source settings, then you may chose single port simulation. I hope this helps. Sayim
  • R

    Simulating with different materials.

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  • D

    How to get the current intensity in the body after electrical stimulation instead of the current density?

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    L
    The easiest way I found is to use the power (I=P/V) as it shows you the current lost in different parts of the model as well as overall. have a look at what was mentioned here https://forum.zmt.swiss/topic/24/compute-the-total-current-flowing-between-two-electrodes-in-an-electro-quasistatic-lf-simulation/3?_=1618565314728
  • D

    About how to use sim4life to simulate the tactile feedback of upper limb electrical stimulation

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    @lj I have followed the yoon-sun arm stimulation tutorial, but I don’t understand the meaning of the results obtained. I don’t know the relationship between these results and tactile feedback, nor can I understand how to get information about tactile sensation and nerve fiber potential. Information link.
  • D

    who can tell me what is the wrong

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    D
    thank you bro，I have found what the wrong ,I have simulated too many times, causing the D drive to run out of space. I cleaned it up and the problem was solved.
  • K

    How to define user defined source in Neuron solver?

    neuron stimulus source
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    K
    https://forum.zmt.swiss/topic/175/user-defined-waveforms Linked thread illustrated the exact solution for the above problem.
  • D

    simulation failed

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    AntoninoMCA
    @daolin_qu Could you please check that you are selecting the Nerve_ventral_root_spinal_T1_Brachial_plexus_ulnar_right_6 spline entity and not the nerve itself that instead is a surface mesh entity part of the anatomical body? Thanks!
  • D

    Yoon-sun Arm Neural Sensing case neuron does not work

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    AntoninoMCA
    @daolin_qu From the image you posted, I see that you haven't yet load the model, that's why you cannot run yet a simulation. You can do that by clicking on the 'Load Model' icon in the top panel. After that, you can assign sensors and run the simulation. The 'Load Model' initiates the discretization of the axon trajectory into compartments (electric circuits describing the electrophysiology of the specified axon model, i.e. SENN).
  • D

    How to choose between EM LF ELECTRO and Magneto

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    S
    Scaling method ref. Furse C M and Gandhi O P1998 "Calculation of Electric Fields andCurrents Induced in a Millimeter-Resolution Human Model at 60 Hz Using the FDTD Method" Bioelectromagnetics 19:293–299 (1998)
  • L

    Evaluating sim4life for tDCS

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  • D

    Follow "Thermal Solver Tutorials »3.3.1 Heated Brain" to simulate the problem of the arm temperature field

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  • D

    Discussion on the slower simulation speed of EM FDTD for lower frequency electromagnetic field

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    H
    what is ARMA? FDTD is not adequate for any simulations where the wavelength is long compared to the object being modeled https://speag.swiss/products/semcad/modules/what-is-fdtd/
  • C

    Yoon_sun 3.6.4 Tutorial Sensing Issue

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  • D

    Some noun issues

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  • D

    What do these units mean? I don’t know what this simulation result means?

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    PeterStijnmanP
    Re{Ez,exp(jβ)} is the real part of the z-component of the electric field and RMS{D(x,y,z,f(0))} is the root mean square of the displacement field which is defined as D = permittivity*E. You can change what you want to see in the properties tab of your screen.
  • H

    Units of Vector Potential Source in Magneto Quasi Static

    field units quasi static rms peak
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