Natural Science Forum / Chemistry / Electrochemistry / April 2004

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                    Frequently Asked Questions, Part 2 of 3
                         SCI.CHEM.ELECTROCHEM/ELETQM-L
                          Revision date: February 7, 2004.

Has anyone out there know of any papers or links to using white noise for
impedance Spectroscopy?
Also, anyone have a broadband circuit for a white noise generator.
Cheers

I have a Maha C777 charger that I run on 12VDC power.  So powered, it
will only charge a 9.6V pack (8 batteries).
I want to power my equipment with 10 AA NiMH batteries in series
(12VDC), with the charger continually connected.

Got a couple of dead batteries from Sony Vaio notepads. The replacements are
behaving themselves which shows the charging circuit is OK. Thinking back a
few years we used to have some portable radios which had a resettable 'fuse'
in the battery which stopped anything too serious ...

Dear Sirs,
Hyperaccumulator plants are plants wich accumulate considerably higher
concentrations of certain metals compared with normal plants.
For example (values in ppm):

I want to "fast" charge 10 AA NiMH cells in series from a 20 watt
solar panel that generates from 20VDC down to zero, depending on
ambient light.
At all times possible, I would like as much of the current flowing off

I just purchased a used Nokia 5160i and noticed that it uses either a 3.6V
NiMH or Li-ion battery.  The charger supplied with the unit is, apparently,
not the charger that Nokia recommends, although I've used it a couple of
times.  I see that there are several chargers recommended ...

Schottky junction is the most popular model used in the junction
between organic semiconductor and electrode. This model describes
the charge flux due to thermal electron with the potential drop
across the junction.

There are some mentiones i media of a NEC battery that recharges in 30
seconds.
Do anyone here have information on this?
The last was in "Digino" (WWW.digi.no) postet today, a bit late for April

My laptop, Compaq Presario 1510T (also known as Evo N1000c, go
figure....) works fineoff the AC adpter but does not charge my
batteries.
The batteries are OK, they charge just fine in someone else's laptop,

Does anyone know where I can get very large NiMH batteries?  The suppliers I'm
familiar with only deal in cells up to about "F" sized.  I'm looking for larger
than that, if they exist.  Ultimately I'd like to get an "8D" equivalent, such
as for marine/golfcart/forklift applications. ...

I am plating copper bars using a small manual galvanic plant.
Before inserting the bars in the plant, they are subjected to two
different washings:
1) first washing with nitric acid

Is there a quick test for Li-ion batteries that tells you how strong
they are?
Assuming there is no quick test (like measuring the voltage one hour
after a full charge), and I must put a load across the terminals, what

I am trying to electroplate copper on graphite but do it in a solution
where the difference in Overpotentials between copper and graphite
substrates is minimized. In conventional acid copper plating solution the
overpotential for graphite is relatively high. Is it possible to ...