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Melika Sharifi

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About Melika Sharifi

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  1. Melika Sharifi

    Activation code, new laptop

    Dear David, I'm sorry to hear about your laptop issues. I've reset your license from our end. You are all set to activate your license again. Bests, Melika Sharifi Aqueous Solutions LLC
  2. Melika Sharifi

    TMAH as basis in Spec8

    Hello, Each thermo dataset in the GWB has a set of basis species, redox species, aqueous species, minerals, oxides, and gases; you can load each into any GWB app using File--> Open--> Thermo Data... . In SpecE8 or any other apps in the GWB software, only basis species of the loaded thermo dataset are directly available on the pulldown list. You can alter the basis species to reflect the geochemical constraints in your system by clicking the pulldown next to the species and choosing the aqueous species of your interest. If you can not find the aqueous species of your interest in the database and are interested in adding new aqueous species/reactions along with their log Ks to each thermo dataset, you can use TEdit program which is a thermo data editor. Sections 9.2.3 and 9.2.4 in the GWB Essentials Guide describe how to add reactions to your thermo dataset using TEdit. Hope this helps. Bests, Melika Sharifi Aqueous Solutions LLC
  3. Melika Sharifi

    Log ratio activity in Act2

    Dear Mulyanto, Thank you for your question. You can certainly set activity ratios for X and Y axes in the Basis pane in Act2 program. To do so, you'll need to swap an activity ratio into the basis. For your problem, for example, you need to select "K+" for the x-axis species and "Na+" for the y-axis species, then click on the swap button next to each and select Ratio... . In the Species Activity Ratio box set H+ as the denominator with power 1. For more information, please read Using Act2 section in the GWB Essentials Guide. All GWB Users Guides can be accessed from the Help menu of any GWB app. Bests, Melika Sharifi Aqueous Solutions LLC
  4. Melika Sharifi

    Permeability Alteration

    Hello, Thanks for attaching your scripts. From your scripts, it looks like the concentration of some elements in the inlet fluid, such as silica SiO2(aq), is too high for seawater. Please double check the concentration of all elements and make sure you are using the correct unit. Hope this helps. Bests, Melika Sharifi Aqueous Solutions LLC
  5. Melika Sharifi

    Permeability Alteration

    Hello, In x2t, to plot porosity or permeability(along x or y), you can either plot them as a color map to see their variations over the domain at a specific time step. Or, you can plot them VS. time or position as an XY plot. Hope this helps. If you need more assistance, please attach your script so I can take a closer look at it. Thanks, Melika Sharifi Aqueous Solutions LLC
  6. Melika Sharifi

    Activation code not working

    Hello, I'm sorry to hear about your laptop. I've reset your license from our end. You should be all set to activate your license on your new laptop. Bests, Melika Sharifi Aqueous Solutions LLC
  7. Melika Sharifi

    Cannot paste GSS data into excel

    Hi Polo729, We are not sure what the problem could be. Please make sure that when you want to paste your data into Excel, you single left-click on a cell to select the cell. If you double click on a cell, and then paste your data, all your data will be pasted in that cell. Please let us know if you keep having any issues. Thanks, Melika Sharifi Aqueous Solutions LLC
  8. Dear John, From the dataset you sent us, it looks like Biotite has not been properly added to the dataset. To add a mineral or an aqueous species, you'll need to supply the necessary reaction between the new species/mineral and the basis species in the dataset, as well as the log Ks (from literature) for that reaction at different temperatures. Sections 9.2.3 and 9.2.4 in the GWB Essentials guide describe how to add reactions to your dataset using TEdit. I think you'll also find the tutorial entitled "How do I add new elements, species, and reactions" helpful. Bests, Melika Sharifi Aqueous Solutions LLC
  9. Dear Marc, I've reset your license from our end. You should be all set to activate it again. Bests, Melika Sharifi Aqueous Solutions LLC
  10. Dear Erik, I just wanted to let you know that "calling cumulative mass influxes and effluxes over simulation" will be added to the GWB commands in our next release. Thank you for your valued feedback and suggestion. Bests, Melika Sharifi, Aqueous Solutions LLC
  11. Melika Sharifi

    About ACT2 result problem

    Dear Betty, Act2 can be useful for understanding the geochemical conditions under which various mineral are stable. It calculates and plots activity-activity diagrams. This class of diagrams shows the stability of minerals and the predominance of aqueous species in chemical systems. A species activity, gas fugacity, activity or fugacity ratio, pH, Eh, or pe may serve as an axis variable. If you are trying to simulate reaction paths and precipitation/dissolution of minerals, you may need to use React. You specify the concentration of fluid components in your initial system, define a reaction path, and React computes the change in your initial system as it undergoes the defined reaction. Hope this helps. Bests, Melika Sharifi, Aqueous Solutions LLC
  12. Melika Sharifi

    About ACT2 result problem

    Dear John, Act2, shows the stability of minerals and predominance of aqueous species for a single “element” or component, the diagram species, over the chosen axes: pH and Eh in your case. They’re allowed to complex with any of the ligands that you specify in the “in the presence of” field. Thus, when you add Fe++ to the "in the presence of field", you define the activity of Fe++ and allow it to make complexes with your main species. Thus, theoretically, you should get a different plot from when you don't have Fe++. However, there are a few things in your plot that I think might not be set correctly: 1. If you are looking at the speciation of sulfur, there is no need to swap Pyrite in. Pyrite will show up on your plot if it is stable over the defined pH-Eh range. 2. if you know that your complexing species reacts under changing Eh or pH, you can include that in your graph using the "speciate over x”, “speciate over y”, or “speciate over x-y" options from the pulldown next to where you define your complexing species activity. For example., Fe++ would speciate and/or change oxidation state in response to changing pH and Eh. Finally, to check your simulated environment go to the “plot” plane --> “view results” to see all the reactions and the activity of species in your system. Hope this helps. Bests, Melika Sharifi Aqueous Solutions LLC
  13. Melika Sharifi

    Built-in Kinetic Rate Law

    Dear Erik, GWB does not determine which species to include as a promoting or inhibiting one, but it is the user who has an option to do so based on data from literature or from their lab experiments. For more information, please read section 4.2.1 "Promoting and inhibiting species" in the GWB Reaction Modeling Guide. Bests, Melika Sharifi, Aqueous Solutions, LLC
  14. Melika Sharifi

    Raffinate Solution X2t Model

    Hi Erik, Thanks for providing the additional information. If you see rapid dissolution of minerals in your system, they should not be set as being in equilibrium with your initial system. You can, instead, put them on the Reactants pane as kinetic minerals. Another thing that you might find helpful is to set Cl- as the balance species. Bests, Melika Sharifi, Aqueous Solutions, LLC
  15. Melika Sharifi

    Setting the CO2 quantity

    Dear Zsofia, The GWB's default thermo dataset, thermo.tdat, is compiled along the steam saturation curve from 0 -300 C. we don't currently account for the effects of pressure on the stability of species and you cannot control the pressure independently from the temperature, but you can certainly set the partial pressure or fugacity of gases in the initial system , but there are no "sliding partial pressure" paths. Hope this helps. Bests, Melika Sharifi, Aqueous Solutions, LLC
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