MRT - Science method

Many different sources introduced various values for the "S" matrix.

#LBM

#LBM_MRT

#multie_relaxation_time

I'm implementing a solver leveraging the Lattice Boltzmann method for Basic Oxygen Furnace simulations (using multiple-relaxation time and D3Q27 cell model), where the jet blows oxygen onto slag surface with speeds of 1.5-2.5 Mach. Process involves multiphase flows, phase transitions, combustion, and turbulent behavior of slag fluid around the interface with blown oxygen. My current focus is on the gas-fluid interface and the impact of the high-Mach flow of oxygen.

I would like to ask what would be the best approach for simulating such phenomena with LBM and MRT scheme?

Hi all researchers! I am working on simulation of flow past a square cylinder using IB-LBM MRT method at Re=2100. I am having 4096 by 2048 mesh cells in a 50D by 25D domain where D=0.1 and I am looking at the results that on the same number of simulations the flow seems to be attached at Tau=0.505 while it seems to be OK as at Tau=0.5025 while all the parameters are kept same. Could anybody please let me know that how far this thing depends on relaxation parameter as the results are quite different and strange. The Z vorticity contour images are attached for reference Anxiously waiting for expert opinions and guidance.

Best Regards

As MRT express the decay rate (average time that biochar can persist from decaying) and this rate decreases with time. Therefore, the incubation period becomes pivotal for the MRT calculation because shorter duration may lead to higher estimated mineralization rate and shorter MRT. So, can we consider other means of getting justifiable stability period?

please suggest a methodology for above.

I want to compare the recalcitrance of two different root residues by incubation to infer differences in potential SOC sequestration. Many studies do this by showing the short-term CO2 efflux; however, this says nothing about the stable fraction or potential sequestration. A sample with faster short-term decay may have a longer MRT for its stable fraction. Why not measure TOC at time points over a longer incubation instead of CO2?

Dear All,

I performed a compound PK analysis in Dog and Monkey. The PK modeling is based on non-compartment analysis (NCA) and, I found that the compound's t-half time much longer than its mean residence time (MRT).

I was wiondering if anyone also observed this phenomena before and could please give me any suggestion to explain the data.

Thank you so much!

Best,

Tianzhu

How MRT is greater than SRT and HRT in attached growth biogas reactor?

If I follow Anderson v. Wincoop with their structural gravity model and want to lay focus on only three sectors and for estimation purposes assume that GDP equals the expenditure, then

1) would it be an issue taking total GDP (as I find no concise data on GDP per sector for each country)?

2) How do I incorporate multilateral resistance terms in form of dummies (i.e. how would I calculate them exactly) when using an OLS estimator?

Thankful for any hints, suggestions and thoughts.

Merry Xmas everyone.

No matter how many iterations I do for a steady state problem, the residual for the BGK (or MRT) LBM does not drop below a certain value (which I noticed to depend on the inlet flow velocity).

Even with double precision calculations the residual does not drop below 1e-7

I am currently following the MRT scheme but I am not getting when should I use definitely MRT over BGK as keeping computational cost in mind. Any input from your side is always appreciated.

Thank you

I was reading following paper in this paper equation no. 11 is taken from ref[23,30] for calculation of Ur velocity; however both references have different formula, So which is the correct formula?

Hi Guys. How do you comment the computational efficiency of the Lattice Boltzmann method even though anyone work on the LB methods said the method has very good parallel efficiency. This topic is limited to the efficiency comparison for unsteady state problems. The relaxation time of the LB-BGK model cannot be adjusted within a wide range due to the numerical accuracy and stability. This means the physical time step cannot be increased greatly when the mesh structure is given. On the contrary, the traditional CFD method, such as FEM, can allow for adjusted physical time steps even for a non-linear problem. Sometimes, the physical time step of the FEM method is several order magnitude  higher than that by the LB-BGK method. Though the LB-BGK method can take less computational time to run a numerical step, the numerical step is much lower than the traditional CFD method. For validation, I compared a parallel LB code with the COMSOL software, which shows a much worse efficieny of the LB-BGK model than the COMSOL software when solving a single-phase reactive flow through some squares in an open channel. How about the computational efficiency of the LB method for the other physical problems, such as two-phase flow, or flow in more complex structures. Can the relaxation time of MRT method be adjusted within a wider range for a greater physical time step but to guarantee the numerical stability and accuracy? Any other method to overcome the problem? Thanks a lot. 

I am using StarFM for data Fusion between Landsat 8 and MODIS. I re-sampled MODIS from 500 m to 30 m resolution using MRT Tool.  I crop the both Images Landsat and MODIS using a Shapefile. When I overlap two images, MODIS resampled image shows more extent than Landsat 8 Image.

I need to make two images of same size and of same resolution.  

Since an Operation two years ago a Patient suffers from the impression that he is still in a room after he had left it.  He feels body sensations, for instance as if he still would sit on the chair and sees images of what he saw in the room before. The impressions last for hours and days and are very disturbing in the daily functioning. There is no evidence for other psychotic symptoms. He is aware that his symptoms are distorted impressions. In his MRT is no abnormality.

Does anyone have informations about a similar case? Is it possible that the perecptions are a result of the Operation and have an neurological reason?

the application of mental rotation test. 

concerned  the development of children.

We're doing a experimental research about cultivation microalage in MPBR ( using diluted human urine as a substrate ), we operated the model with HRT = 2days and MRT ( biomass retention time) = 10 days. The volume woking of each column of our model is 4L. After cultivation day 14, we started to withdrawn alage with 400ml alage for everyday to retain the stable biomass concentration in coulmn ( until now it lasted for 50 days).The result of dry weight biomass is rather stable. But now we don't know exactly about formula to caculate for biomass producticity and nutrient removal rate when we withdrawn alage everyday (although we read many publications about MPBR, but we couldn't find the suitable formula for caculating those parameters).The our operation condition of model is different to the previous researches (as in your research i didn't see you mentioning about MRT ).There are many new things for us to understand clearly about everything which relates to our model ( now we're only undergraduate students). We really hope you will provide and share your ideas or opinions for the problems we asked, that will help us to understand more about this top.

I am working on carvedilol loaded polymeric nanocapsules. The pharmacokinetic study of nanocapsules revealed an increased tmax, Cmax and AUC while a reduction in t1/2 and MRT as compared to drug suspension with same dose. What could be the possible explanation for the phenomenon?

This approach is mentioned in the following articles:

How to get the probabilities P(R) and P(0)?

I have to prepare a design manual for seismic resistant stone masonry school building with mud mortar and timber frame structure. Roofing will be wooden or steel truss with CGI roofing.

If you have/know such document and design calculations, please help me by sending it to me for reference.

Thank you all..

Seems that MRT's batch model could not work due to 2G limitation for TmpMosaic.hdf file

I want to analyze  and the compare linear and non-linear precoding techniques for large scale MU-MIMO downlink.please suggest the papers or book from where i can easily understand and implement these precoding techniques for downlink.

Dear colleagues,

the case is a 16-year old boy who was diagnosed with Herpes Zoster Encephalitis. He developed headaches, had to stay home, had temperatures around 37,3 celsius, showed the zoster rash on day 3 (when brivudin and ibuprofene were started), then started vomiting frequently without gastroenteritic symptoms, and was hospitalized on day 4 when meningeal affection was found. 

He had no neurologic deficit, was treated on ICU for 3 days with aciclovir and antibiotics, liquor showed a mild increase in cell  count (260) and doubled proteines. 

PCR found a count of 36000 varizella zoster virus copies. Since there was no trace of bacteria in the liquor culture antibiotics were suspended.

The treating colleagues (the patient is a family member and the field not so familiar to me) were puzzeled to find this rare diagnosis in a healthy 80kg boy who had varicella immunization in 2000.

MRT is planned for next week. Immune status will be checked the next days. The iv antiviral therapy will be continued for 10 more days.

the clinical course is very promising (only very mild headache once today) so the exspectation is that recovery will be soon and complete. 

Since the case seems to be quite extraordinary I am very interested in your personal experience. 

THANK YOU 

 I downloaded MODIS product (MODQA9) for vegetative monitoring, processed using MRT tool and tried to geoprocess in SAGAGIS, but to no avail, image not uploaded. Can ARCGIS be used, If yes, can someone help with the steps to follow? Or is there any other model apart from ENVI (very expensive) to process MODIS data. Or can somebody help with ENVI code?