it seems to happen (in Sim4Life 9.0.0) when you switch to the analysis tag after sending a solver job on the cloud. I guess it can be ignored and will be fixed in an upcoming update-fix release

Hi, Did you run your simulation using our SMALL server (16 CPU cores, 32 GB RAM) or the LARGE server (48 CPU cores, 96 GB RAM)? Also, could you let us know the total number of cells in your simulation? As a general suggestion for optimizing memory usage, you can start by running a simulation with a coarse grid to identify regions where the fields are negligible. Based on this, you can adjust the grid padding settings to exclude those body regions from the simulation domain, effectively "cropping" unnecessary areas and reducing the computational load.

I used it to get information for high level workflows. It can also come with suggestions for code, obviously, but it often invents functions that don't exist and implementations for me has not been very AI-powered. But the theoretical discussions are quite good.

Here is the Web Manual section containing this information: 2.11.3.9 Neuro-stimulation with Imperfect Electrode-Skin Contact. Additionally, Yoon-Sun Arm Stimulation tutorial also includes this new feature. For more information or examples you can contact us at s4l-support@zmt.swiss. Thanks!

Hi In Sim4Life the tissue properties are provided as a single values. However, the IT’IS website provides supplemental information on the tissue properties. In addition to the average value, you can find the standard deviation, minima and maxima. Low Frequency (Conductivity) » IT'IS Foundation](https://itis.swiss/virtual-population/tissue-properties/database/low-frequency-conductivity/)

Dear ZMT Team, I am currently studying the Temporal Interference tutorial with the SAM Head model, as provided in the Sim4Life documentation (Tutorials/EMLF/LF_Multiport.html#temporal-interference-with-sam-head). I have followed the steps carefully up to the solver stage. However, during the simulation run, I encountered the following warning: Solid X_Electrode (Selected_Electrode): PEC - no edges associated with this material and thus it is disregarded. Also, I’m not sure if the simulation problem affects the analysis. The E-field distribution doesn’t show up, but the tutorial shows it in the figure at the bottom. Could you kindly advise if this warning affects the simulation output, and how I might resolve the issue or verify my results? Thank you very much for your time and support.

After a call with S4L support, here is the solution for future reference: My machine had two GPUs connected, one of them old and deactivated. However, the script ExtractCudaInfo.py detected both of these in the line 'num_gpus = int(xml_root.find("attached_gpus").text)' and then got stuck trying to find information on the deactivated GPU. A quick fix for the issue is therefore to manually set the correct number, in my case 'num_gpus=1', in the script.

Hi @bryn, I think you’re right. The issue appears to be related to the boundary conditions on the outer bounding box. I changed the boundary to a flux(0) condition, and that resolved the problem with the localized high field values at the extremities. Thank you!

Please give more context. E.g., "in the modeler when I use tool X", or in a "Y simulation" there is an option. or in this other thread (link) I asked about Z Then it will be easier to answer your question.

Are you able to run other NEURON tutorials (the pre-build versions)? If not then this issue could be related to the NEURON installation or version. It is possible that using an older version of the NEURON solver is causing the error you mentioned. Please make sure you have the correct version of NEURON installed in your Sim4Life folder. For instance, as you are using Sim4Life version 8.2.0.16876, you should download NEURON using NEURON_setup_8.2.0.16876.exe.

@Sylvain Hi, thank you for your reply. I changed modulated field to El. Loss Density and everything works.

Thank you. Uploaded.

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