Experimental errors

The F2B slab model weakens the oscillations and calculations on F2B model quickly converge. However, the F2B model leads to artificial narrowness of band gap. Besides, when the number of layers increases, surface energy obtained from all three slab models approaches similar values. In particular, values of surface energy from DFT calculations converge to the experimental range for all three slab models.

8p dianmotminh02 03-05-2024 11 3   Download

Data of unknown quality are useless! All laboratory measurements contain experimental error. It is necessary to determine the magnitude of the accuracy and reliability in your measurements. Then you can make a judgment about their usefulness. Replicates - two or more determinations on the same sample Example 3-1: One student measures Fe (III) concentrations six times. The results are listed below: 19.4, 19.5, 19. 6, 19.8, 20.1, 20.3 ppm (parts per million) 6 replicates = 6 measurements The "middle" or "central" value for a group of results: Mean: average or arithmetic mean ...

67p doilan 26-01-2013 55 6   Download

Tham khảo bài thuyết trình 'analytical chemistry', khoa học tự nhiên, hoá học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

61p doilan 26-01-2013 78 9   Download

Almost always, the cause of too good a chi-square fit is that the experimenter, in a “fit” of conservativism, has overestimated his or her measurement errors. Very rarely, too good a chi-square signals actual fraud, data that has been “fudged” to fit the model.

6p babyuni 17-08-2010 77 3   Download