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EDUCATIONAL APPLETS* (in Javascript)
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Analytical
Chemistry
- General
Chemistry
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Draw
plots of the concentration fractions of polyprotic acids species as functions of pH. |
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Draw plots of the concentration fractions of successive complexes
ML, ML2, .... MLn as a function of
log[L]. |
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Draw
the titration curves expected for titrations of a number of real acids
and bases at any combination between each other and at any concentration
level. |
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Periodic
table of elements and correlation plots of their properties |
Inspect
the numerical values of a number of properties of the chemical elements
and create correlation plots between any two of these properties. [2000/07] |
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Instrumental
Chemical Analysis
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Observe
the effect of the selected wavelength and of the bandwidth of the
incident radiation beam on the absorbance vs. concentration plot. |
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Insert
the empirical formula of an ionic fragment and obtain the relative
intensities of its isotope peaks. Οbserve the lines corresponding to
this fragment, as they would appeared in a mass spectrum. |
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Simulated
separation of a mixture of two substances by counter-current extraction
using a Craig apparatus. |
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Simulation
of the separation of a mixture of 5 substances across a chromatographic
column and of the recorded chromatogram. |
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Observe the consumption and the production of particles participating in a reversible electrode reaction, their corresponding concentration profiles and
the effect of the potential of the working electrode. |
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Instrumentation
- Signal Processing
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Analog
electronics: Basic circuits of operational amplifiers |
Examine the operation of the following circuits of operational amplifiers: inverting amplifier, summing amplifier, difference amplifier, differentiator,
and integrator. |
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Examine
the 'truth
tables'
of digitals gates and the propagation of logical states through some
simple circuits combining various gates. [2001/04] |
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In this simulation you can study how a binary and a decimal (BCD) counter operate and check the differences between them (in Javascript* [2019/03]) |
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Improve
the signal-to-noise ratio of various signals by the moving average,
Savitzky-Golay and ensemble average techniques. |
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Observe
the gradual formation of some periodic non-sinusoidal waveforms by
successive point-to-point additions of sinusoidal functions. |
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Fourier analysis and signal filtering |
Obtain the frequency spectrum H(f) of a signal h(t) using a Fast Fourier Transform (FFT), and observe the effect of clipping of certain frequency
bands on the original signal |
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Observe the effect of the form of the impulse response function on the form of the output signal in relation to input signal (in Javascript* [2019/07]) |
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Observe the sampling rate effect on a sinusoidal signal and the condition leading to the production of an aliased signal (in Javascript* [2018/10]) |
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Data
Analysis - Chemometrics
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Observe the outcome of this statistical test for various pairs of data sets,
which you can easily define. |
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Define sets of values of replicate measurements and examine if one of them in each set can be rejected as an outlier or not. [2006/05] (in Javascript* [2018/07]) |
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A
demonstration of the m-degree (m equal or less than 12) polynomial
least-squares regression on data sets defined by the user. |
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Try a non-parametric regression method (Theil's Incomplete Method) to fit a straight line to data points and compare the results with those obtained with
the least-squares regression method. |
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Observe
how Simplex algorithm is searching for the "global
extreme" through a
2-dimensional parameter space. |
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Observe how the population of the mean values of N measurements, obtained from populations of any distribution, gradually tends to be normally distributed as the number N (sample size) increases. [2005/11] (in Javascript* [2018/06]) |
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An introductory example on Monte Carlo simulations: Calculation of probabilities
of the arrival of a "drunken sailor" to each one
of a town exits.
[2000/04] (in Javascript* [2018/08])
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* Applets are written in Javascript and can run on all common browsers
For the list of the Educational Applets in Greek click HERE.
These webpages are maintained by: Constantinos E. Efstathiou, Professor Emeritus
email: cefstath [at] chem.uoa.gr
