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  • Output of a Diffractometer - Chemistry Stack Exchange
    3 Working with a single crystal, what is the first thing the diffractometer has access to? What is the output I see and what are the steps from this two levels of information? If I'm correct, the output might be (hkl) indexes and their intensities, but I don't know how the instrument can assign the coordinates in reciprocal space to the spots
  • Convergence issue in Gaussian - Chemistry Stack Exchange
    Just few suggestions for finding a stationary point You can add some additional angular flexibility into the basis by changing it to, say, 6-31G(2df,p) or even switch to more modern Ahlrichs' def2 bases (Def2SVP to start from) Besides, you'd better use UltraFine integration grid and tight optimization criteria and do geometry optimization and frequency calculation in a single run: Opt=Tight
  • computational chemistry - How to construct a QST2 input file for . . .
    TL;DR: QST2 will not work For QST2 calculations you need one reactant structure and one product structure, the program will then attempt a transition state guess The essential point is, that the supplied structures have to have identical ordering (in Cartesian coordinates), or identical z-matrices, although I am not sure that this works For more on how to run these types of calculations
  • biochemistry - How do I interpret the results of this DNA gel . . .
    This run was meant to be a sort of mock-forensics experiment There is DNA from the "crime scene", "suspect 1", and "suspect 2" There are 3 samples from each, one is untreated, one is digested with EcoRV, and one is digested with PstI
  • Converting SMILES to . sdf files - Chemistry Stack Exchange
    I have around 1000 SMILES entries in Excel and I have to generate sdf file for all Is there any way to automate this whole process, preferably with an offline tool?
  • What current and voltage are best for electrolysis rust removal?
    I run graphite plate electrodes (anodes), to avoid consuming them I try to stay below 15A square foot, much depends on the area of both workpiece and electrode
  • What causes the DNA fragments to stop moving in gel electrophoresis?
    Also today it is quite common to have the DNA stain already in the gel while the electrophoresis is running (instead of adding a staining solution at the end of the run) This allows to follow the DNA run in "real time"
  • Why is the Haber process carried out at such high temperatures?
    As others have pointed out, it is purely kinetics, but you may still wonder, why For a reaction to actually occur (in both directions) and thus for an equilibrium to be reached, you need to overcome the activation energy In the case of the Haber-Bosch process, this involves breaking the highly stable $\ce {N#N}$ triple bond Even with the catalysts used, the energy required to break apart
  • How much can we extend the Finkelstein reaction?
    DMF typically has trace water in it as it forms a very stable dihydrate—that’ll increase solubilities more you could test that if you tried to run that reaction over molecular sieves but in general, there’s too many factors going into these things to just brain your way through it, it’s a complex subject with lots of intricacies and
  • Conversion of methane to propane - Chemistry Stack Exchange
    Generally, this reaction is run in reverse Hydrogen reformers are used to generate hydrogen by the following reaction scheme: $$\ce {CH4 + H2O -> CO + 3H2}~~~\mathrm { (Endothermic, 1000C)}$$ This is frequently followed by the shift reaction $$\ce {CO + H2O -> CO2 + H2}~~~\mathrm { (Exothermic, 300C)}$$ Hydrogen reformers that run on heavier hydrocarbons than methane are frequently fitted





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