HDTenEightyP/NetNews huggingface dataset:
From: kt1@hera.uucp (22222-tellefsen)
Subject: Re: Can a 'dead' nicad be recharged?
Organization: Bellcore, Livingston, NJ
Date: Wed, 9 Sep 92 13:01:50 GMT
Summary: This is dangerous

In article <1992Sep9.014106.28148@mtu.edu>, cescript@mtu.edu (Charles Scripter) writes:
> In article <1992Sep8.222410.9895@cs.yale.edu>, dave@master.chem.yale.edu
> (David Maxwell) writes:
> 
> > From article <1992Sep8.171432.1@eis.dofasco.ca>, by fraser_h@eis.dofasco.ca:
> > > I've just picked up a cordless drill at a garage sale. It came
> > > with 2 sets of nicads, one of which will hold a partial charge,
> > > the other will not hold any charge (so I'm told by a local
> > > surplus supply store where I had the batteries tested). The
> > > batteries are about $70 each... is there any way they can be
> > > recharged? What's the explanation for nicad's "memory" I hear about
> > > all the time, and what's the difference between the chemistry in
> > > a nicad and that in a lead-acid battery.
> > > 
> > > -- 
> > > Hugh Fraser					Dofasco Inc.
> > > (fraser_h@eis.dofasco.ca)			1330 Burlington St East
> > > (416)544-3761 X6941				Hamilton, Ont. L8N 3J5 Canada
> > 
> > I remember reading about this in some computer magazine which
> > described laptop batteries.  The person suggested that the
> > full charge could be restored if the battery was completely
> > discharged and recharged a couple of times.  The technique was
> > to discharge with decreasing loads levels until the battery is
> > dead.  For example, start with a small electric motor and 
> > work yourself down.  If the battery is going to work at all,
> > this should do it.
> 
> I think I also heard that "shock them" with high voltage (need to
> be able to hit with a few thousand volts for short times).  This
> allegedly burns out the internal shorts.  I've never tried it, so
> you're on your own.  If the batteries are completely dead, you've
> got little to lose....
> 
> -- 
> Charles Scripter   *   cescript@phy.mtu.edu
> Dept of Physics, Michigan Technological University, Houghton, MI 49931
> -------------------------------------------------------------------
> With your one remaining eye, please do NOT look back into the laser

I strongly suggest not "shocking" NiCad batteries with a high voltage,
there is a possibility the battery may explode.  NiCads contain alkaline
electrolyte and cadmium, a very toxic metal. One may lose a lot if an injury
occurs during this procedure. (Funny, that a remaining eye is mentioned in
Mr. Scripter's sig.) If you can't revive Nicads
through the slow discharge method, throw them away or put them in the 
recycle bin.
Newsgroups: sci.chem
From: aankrom@nyx.cs.du.edu (Anthony Ankrom)
Subject: Re: 1,4-dichloro-2-butyne
X-Disclaimer: Nyx is a public access Unix system run by the University
	of Denver for the Denver community.  The University has neither
	control over nor responsibility for the opinions of users.
Organization: Nyx, Public Access Unix at U. of Denver Math/CS dept.
Date: Tue, 15 Sep 92 06:21:29 GMT



 I think I should perhaps clear up a few things. 

First, despite my youthful fervor in my interest in chemistry, I do have
enough common sense to know what is dangerous and when not to do it. Trust
me, I'm no fool.

 I am extremely adept at finding what I want in "the Journals", but
searching for and reading 25-50 articles a day (or more) gets tiring. If i
can cut that down I can save myself a little wear and tear. Of course the
exercise going back and forth between libraries isn't so bad (I frequent
five or six different libraries on campus). Sci.chem seemed like a good
adjunct. I apologize a little for sounding a little foolish. That's simply
zeal, I suppose. Then one has to allow for net-misinterpretation...

 Tremorine is only mildly toxic. It's Parkinsonian effects are temporary,
lasting a few hours. Almost any cholinergic substance will produce
Parkonsonism to varying degrees (and always reversable). Tremorine is
merely an ideal neurological tool in that it produces the rigidity and
tremors of Parkonsonism with few cholinergic side-effects (relative to
other cholinergic agents). And it's not as if I would administer this
compound at my whim. People assume far too much from a simple inquiry...

St. Anthony

--
        CH3  O            CH(CH3)2        |      dadaMatrix
           >-P-S-CH2CH2-N<            VX  |                       
    CH3CH2O               CH(CH3)2        |     aankrom@nyx.cs.du.edu
                                          | A kinder gentler lobotomy...
Newsgroups: sci.chem,sci.energy
From: whitbeck@equinox.unr.edu (Michael Whitbeck)
Newsgroups: sci.chem
Subject: Re: chemical safety
Date: 9 Sep 92 22:38:28 GMT
Organization: University of Nevada, Reno

In article <1992Sep2.072649.4446@bb1t.monsanto.com> bjgaed@bb1t.monsanto.com writes:
>In article <VSUMMERS.92Sep1164310@polaris.cv.nrao.edu>, vsummers@polaris.cv.nrao.edu (Vince Summers) writes:
>
>>    With respect to the current discussion on chemical safety, how does this
>>    impact educational institutions?  I teach undergraduate chemistry courses
>>    with labs -- very "safe" labs, but accidents can and do happen.  If one
>>    of my students were to disregard my safety instructions and get seriously
>>    hurt, would I be liable or would the college be liable?  Or both?
>> 
>>    Carolyn Giberson
>>    giber@pollux.cs.uga.edu
>>    University of Georgia  (<-- not where I teach chemistry!)
>not a very good source for *chemical* safety information.  The 
>American Chemical Society in Washington D.C. has a division devoted to 
>chemical health and safety as well as numerous publications.  Try 

SAFETY in Academic Chemistry Laboratories, pub ACS, 73pp- I
picked my copy up (free) at the sping ACS mtg in SF. 

on the inside cover:
ACS Health and Safety Referral Service 1-800-227-5558, option 6,
8am - 5pm ET M-F (NOT an emergency service)

pamphlets available include
"Design of Safe Chemical Laboratories, Suggested References"
and
"Guidelines on Safety for Authors of Laboratory Manuals"

The address for the ACS is 1155 Sixteenth St, NW, Washington DC
20036.

As far as I know these are free publications- there are also
others that deal with env. compliance for example.

BTW the 800 number is general purpose, not just safety.

Mike

All academics have the potential for being insatiable...
but the chemists are the most expensive and insatiable among the
expensive and insatiable. - J. Martin in "To Rise Above Principle"

Newsgroups: sci.chem
From: cfthb@ux1.cts.eiu.edu (Howard Black)
Subject: Re: 1,4-dichloro-2-butyne
Date: Tue, 08 Sep 1992 18:52:48 GMT
Organization: Eastern Illinois University

In article <1992Sep5.221205.17139@mnemosyne.cs.du.edu> aankrom@nyx.cs.du.edu (Anthony Ankrom) writes:

    [in response to someone's noting that the stuff is commercially
available, and pretty inexpensive]

> Perhaps I WANT to synthesize it... Really. I also forgot to mention the
>fact that I want to use acetylene as the starting material. I am well
>aware of the fact that Aldrich and Chemical Dynamics both sell it as I'm
>sure most other suppliers do, but I have my min dset on synthesizing it
>myself. Forgive me for actually LIKING organic chemistry...

    I'm curious as to why you are not only determined to make it, but to
make it from a predetermined starting material.  Sounds more like you're
doing a problem from the back of some org. chem. text.  The synthesis from
acetylene is obvious, but I'm sure you can find references in the
Dictionary of Organic Compounds or some other such general reference work.

    Your last comment is defensive and a non sequitur, IMHO.  I like
organic chemistry so much that I made a career out of it, but generally
don't make compounds that I can buy cheaply, and I don't respond to others'
suggestions on suppliers with comments such as yours.
-- 
   ******************************************************************
     Howard Black                             cfthb@ux1.cts.eiu.edu
     Department of Chemistry                  Eastern Illinois Univ.
From: whitbeck@equinox.unr.edu (Michael Whitbeck)
Newsgroups: sci.chem
Subject: Re: arcane rearrangement
Date: 4 Sep 92 21:19:41 GMT
Organization: University of Nevada, Reno

Perhaps your interests in amphetamine chemistry are
scholarly and not bent towards criminal activity or
irresponsible actions. But you need to remember that
net postings are a little like writing on a wall-
anyone can read them. That includes high school kids
(some of whom may lack your good judgement) and who
knows who else.

As chemists we MUST be aware that we posess
knowledge which can do great harm if misused. That
is why I personally would decline from reducing the
chemistry of drug or explosive production to simple
step-by-step instructions for the layperson. I
realize that may not be what you were seeking in
your post but that might have been the
interpretation taken by a responder.

I fully believe that most of the subscribers to this
group are NOT chemists but rather individuals with
an interest in chemistry as a hobby- more power to
them. Still I often see posts, with or without the
"I'm not a chemist but...", with very bad advice
given. Advice that if followed naively by another
"I'm not a chemist but..."-type could cause real harm.
Accordingly some of us who are chemists react quite
negatively to some postings. If your interests lie
in pharaceutical chemistry you'll find a whole range
of topics besides amphetamines. 

Mike

Newsgroups: sci.chem
From: howard@netcom.com (Howard Berkey)
Subject: Re: 1,4-dichloro-2-butyne leave the guy alone
Date: Wed, 16 Sep 92 00:41:32 GMT
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
Followup-To: misc.test

People should lay off of this guy.  The internet is an open forum and if he
was mistaken in thinking that this was a good place to ask for advice in
his synthesis he DOES NOT deserve to be accused of ill will.  It's gotten
silly... in a rude (IMHO) follow-up in this thread, someone even flamed 
his 'sick .sig'... many 'legitimate' chemists, whom some on the net would 
gladly have given the info that this person is looking for, work for dow, 
dupont, or other companies that MAKE VX.  
	
The best thing for the original poster to do is to gain lab experience, of
course.  But that doesn't mean he should be denied knowledge or accused
of ulterior motives by a condescending group of professionals in the
field he has chosen to study JUST FOR ASKING.  It's not as if it's difficult
to find or come up with syntheses for illegal drugs.  Posting to the net
would be a pretty poor way to get the information, if that was all he was 
interested in.

My advice to the original poster is to get a good Organic text.  I like
Streitweiser and Heathcock (sp?).  Read it. Don't try anything outside of
a class lab until you DO have the experience.  Alkyne chemistry can be
very dangerous.

When you go back to school, find out what each professor's research projects
are.  Then approach one whose research you find interesting, and ask if
you can get involved in undergraduate research with them.  I learned more
in my undergrad research than I did in my regular classes (except P-chem).

-Howard

p.s. I want to kill this thread...It's a waste of time on this newsgroup.
Please don't follow-up this article.
-- 
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
Howard Berkey						howard@netcom.com
"Jesus Christ, How many people does it TAKE to kill the President?"
		-John Dillinger, in _Illuminatus!_
Newsgroups: sci.chem,sci.energy
From: knapp@spot.Colorado.EDU (David Knapp)
Subject: Re: Can a 'dead' nicad be recharged?
Organization: University of Colorado, Boulder
Date: Thu, 10 Sep 1992 15:11:06 GMT


In article <1992Sep9.215353.4774@porthos.cc.bellcore.com> you write:
>Just a few additions/corrections on the chemistry and
>failure mechanism of NiCd batteries:
>
[stuff deleted]

>
>6. The "memory effect" is especially visible at higher
>current discharge rates. Its cause is the formation of
>a passivating, electrochemically inactive intermetallic 
>alloy, Ni5Cd22, at the negative electrode during the discharge. 
>This reduction in capacity persists on subsequent
>cycles as long as the cut-off discharge voltage remains
>greater than 1 V. However, a deep discharge down to 0.5 V 
>results in decomposition of the Ni5Cd22 alloy and a
>complete reactivation of the negative electrode
>material. If this does not restore the cell's capacity,
>"shocking" it by high voltage pulses may result in an
>explosion and the contamination of the room with
>cadmium (it wouldn't be a lab, would it?)

On you last note, I have read sevearal places that the 'finger' growth
(I read and described as whiskers) can be alleviated through the
shock method. I've even seen it work. It is quite possible to do it
and do it correctly.
 
I've also seen deep cycling *not* help dead NiCads.

-- 
David Knapp                                      University of Colorado, Boulder
Perpetual Student                                   knapp@spot.colorado.edu

-- 
David Knapp                                      University of Colorado, Boulder
Perpetual Student                                   knapp@spot.colorado.edu
From: Richard.Drapeau@tdkt.kksys.com (Richard Drapeau)
Sender: FredGate@tdkt.kksys.com
Newsgroups: sci.chem
Subject: Toxicological Information Sources
Date: Sat, 05 Sep 1992 13:11:16 -0600

I am seeking references to toxicological information compilations, either 
published or at internet sites.  Any recommendations are much appreciated and 
email to richard.drapeau@tdkt.kksys.com will be summarized if notable.
  


 * Origin: PROJECT_4_RBBS SLP_MN_USA (1:282/92.0)

Newsgroups: sci.chem
From: brian@quake.sylmar.ca.us (Brian K. Yoder)
Subject: Re: Carburetors, gasoline, and why I don't recycle
Organization: Quake Public Access
Distribution: na
Date: Sun, 6 Sep 1992 01:35:20 GMT

In article <Bu0KzB.6w1@news.cso.uiuc.edu> cec35848@uxa.cso.uiuc.edu (Chuck Carroll) writes:
>knapp@spot.Colorado.EDU (David Knapp) writes:
>
>>In article <Btz7xq.H47@news.cso.uiuc.edu> cec35848@uxa.cso.uiuc.edu (Chuck Carroll) writes:
>>>1)  You'll need a pretty good estimate of friction, since without it
>>>it would take no energy to move a car over level ground. 
>
>>What about W=F*d?  Ek=1/2m*(dV)^2?  P=m(dV)?
>
>Without friction, it would take only an infintesimally small force to
>start the car moving, and once you did, it could go indefinitely.  The
>same goes for the other equations.

Learn some physics, eh?  How about some common sense while you are at it?
Have you ever heard os a thing called air resistance?

--Brian
From: Christoph_Steinbeck@bn.maus.de (Christoph Steinbeck)
Newsgroups: sci.chem
Subject: Pyrroles --> Dipyrromethanes
Date: Fri, 11 Sep 92 16:27:00 GMT
Organization: MausNet
X-Gateway: MausGate/News 1.11

I would like to know anything about the conditions for coupling alpha-free
Pyrrols, e.g. Ethyl-4-ethyl-3-methyl-pyrrole-2-carboxylate with
5-Acethoxymethylpyrroles to Dipyrromethanes.

Exspecially I'm interested in catalysing with Lewis-acids, like SnCl_4, AlCl_3
etc.

I need this informations for completing my Diplomarbeit, and because any
book about the chemistry of Pyrroles have been stolen from our local
collection, I have no other (faster) possibility to get this information.

Ciao, Christoph


Christoph Steinbeck
Sternenburgstr. 92            E-MAIL: Christoph_Steinbeck@bn.maus.de
5300 Bonn 1
0228/217769


    **** WINDOWS --- from the people who brought you EDLIN ****
Newsgroups: sci.chem
From: PCHT@ibm.rz.tu-clausthal.de
Subject: Re: what is "borbonsaeure" ?
Organization: Rechenzentrum der TU CLAUSTHAL
Date: Sun, 13 Sep 1992 14:49:37 GMT

In article <3830001@hpbbi4.BBN.HP.COM>
bbausch@hpbbi4.BBN.HP.COM (#Bernd Bausch) writes:
 
>Has anybody heard about a substance called (in German) something like
>"Borbonsaeure" (in English, that would be "borbon(e) acid" - I'm not talking
>about whisky :-).
>
Could it be that you mean 'Borons"auren' (boronic acids), which are
acids of the structure
 
                        OH
                      /
                  R-B
                      \
                        OH
 
Hartmut.
Newsgroups: sci.chem,sci.energy
From: dplatt@ntg.com (Dave Platt)
Subject: Re: Can a 'dead' nicad be recharged?
Organization: New Technologies Group, Inc.  Palo Alto CA
Date: Wed, 9 Sep 1992 19:06:05 GMT

In article <1992Sep8.222410.9895@cs.yale.edu> dave@master.chem.yale.edu (David Maxwell) writes:

>I remember reading about this in some computer magazine which
>described laptop batteries.  The person suggested that the
>full charge could be restored if the battery was completely
>discharged and recharged a couple of times.  The technique was
>to discharge with decreasing loads levels until the battery is
>dead.  For example, start with a small electric motor and 
>work yourself down.  If the battery is going to work at all,
>this should do it.
>
>I know the above technique works, because I use it with my CD
>player.  The CD player does not fully discharge the Ni-Cd
>batteries.  Every time I recharged I got less and less out.
>Then I decided to discharge fully with a little electric motor.
>Now I get the full charge each time!

Unfortunately... based on all I've heard and read... this is not good
advice if taken literally.  You can damage the NiCd cells this way.

There's an important distinction to be made between a "battery" and a
"cell".  A "cell" is a single electrochemical unit... NiCd cells deliver
1.2 volts or so when fully charged.  A "battery" is a set of several
cells wired up in series, and delivers a multiple of 1.2 volts.

It is perfectly safe to drain an _individual_ NiCd _cell_ all the way
down to zero, with a small motor or a lamp bulb or an LED or a resistor.
It can be beneficial to do so, as it cures the effect known as "voltage
depression".

However:  it is NOT SAFE to discharge a NiCd _battery_ all the way to
zero by any of these methods.  The chances are VERY good that one of the
cells will run down before the others do... and this cell WILL be
damaged by the continued current flow through the battery.

Hence:  it is safe to drain an individual 1.2-volt cell (AA, C, D, or
whatever size) to zero.  It is NOT SAFE to drain a 2.4, 3.6, 4.8, 6.0
volt (etc.) "battery pack" all the way to zero... doing so will almost
certainly damage it and will _reduce_ its ability to hold a charge in
the future.

-- 
Dave Platt                                                VOICE: (415) 813-8917
              Domain: dplatt@ntg.com      UUCP: ...netcomsv!ntg!dplatt
 USNAIL: New Technologies Group Inc. 2468 Embarcardero Way, Palo Alto CA 94303
Newsgroups: sci.chem
From: aankrom@nyx.cs.du.edu (Anthony Ankrom)
Subject: Re: 1,4-dichloro-2-butyne
X-Disclaimer: Nyx is a public access Unix system run by the University
	of Denver for the Denver community.  The University has neither
	control over nor responsibility for the opinions of users.
Organization: Nyx, Public Access Unix at U. of Denver Math/CS dept.
Date: Tue, 15 Sep 92 20:15:23 GMT



 OK. It has not been my intention to sound evasive. I suppose I'm a little
paranoid, for no real reason. 
 I _am_ a chemistry major. I am not in school at the moment because I
can't afford it. The whole thing is a rather long story. I had gone to
school for less than a semester at Indiana University and now I am
planning to go to Antioch College (The Kettering Research LAboratory).
 There is absolutely no reason fpor me to deny the fact that my main
interest is psychopharmacology. Nor did I really realize that I was doing 
so... Also, there is no reason for me to feel aprerhensive about this
interest. I defy the current "Drug War" tone in everything that makes me
feel at times as if I should censor myself. I refuse to do this. My
knowledgein pharmacology is stronger than my knowledge in chemistry.
Chemistry fasconates me, so I study it as much as I can now.
 You can rest assured that any answer to any posting of mine won't be used
for illicit manufacture in a basement laboratory. I know that I don't have
near enough lab experience to attempt any difficult organic synthesis.
I apologise for not the content of my past posts, but perhaps the attitude.
It is not my intention to disrupt this group. I had hoped to gain from and
contribute to it as well...

St. Anthony

--
        CH3  O            CH(CH3)2        |      dadaMatrix
           >-P-S-CH2CH2-N<            VX  |                       
    CH3CH2O               CH(CH3)2        |     aankrom@nyx.cs.du.edu
                                          | A kinder gentler lobotomy...
Newsgroups: sci.chem
From: whitbeck@equinox.unr.edu (Michael Whitbeck)
Newsgroups: sci.chem
Subject: Re: Luminescent Paint (Q)
Date: 4 Sep 92 21:56:35 GMT
Organization: University of Nevada, Reno

I believe I have seen this in art supply stores in jars, pens
(paint-sticks)...

I have seen it in fishing supply catalogs like Anglers Workshop
(for hobbyists that make their own supplies). AW is somewhere in
Oregon- does mail order but I don't have an address handy.

NO- I have no business interest in AW
NO- I don't make fishing tackle (outside of tying a few flies
but no luminescent paint there- not cricket you know :-)

Mike W.

Newsgroups: sci.chem
From: rbm4t@faraday.clas.Virginia.EDU (R. Bruce Martin)
Subject: Re: Isomers Heuristic?
Organization: University of Virginia
Date: Thu, 10 Sep 1992 20:59:00 GMT

The isomer problem has befuddled many and even noted
mathematicians have erred.  Recursion formulas are
used and they are quite complex.  See Henze and
Blair in J. Am. Chem. Soc. (1931) 53, 3042 & 3077.
Also see Davies and Freyd in J. Chem. Educ. (1989)
66, 278.

Bruce Martin

Newsgroups: sci.chem
From: applequi@cae.wisc.edu (George Applequist)
Subject: Electronic CRC handbook?
Organization: College of Engineering, Univ. of Wisconsin-Madison
Date: 8 Sep 92 10:43:35 CDT
Originator: applequi@sun-5.cae.wisc.edu



Does anyone know if the CRC Handbook, or a similar compendium of chemical
and physical data, can be found in electronic form, either public-domain
or commercial?

Thanks--please mail me and post here if you see fit.

   ___    ____            
  /   \  /       /\       
 /    __/_______/__\____  George Einar Applequist   (applequi@cae.wisc.edu)
 \    \ \      /    \  /  College of Engineering, University of Wisconsin-Madison
  \___/  \____/      \/   
Newsgroups: sci.chem
Newsgroups: sci.chem


Has anybody heard about a substance called (in German) something like 
"Borbonsaeure" (in English, that would be "borbon(e) acid" - I'm not talking
about whisky :-).

Thanks for inputs.

Bernd.
Xref: sparky sci.chem:3439 sci.energy:4235
From: fraser_h@eis.dofasco.ca
Newsgroups: sci.chem,sci.energy
Subject: Can a 'dead' nicad be recharged?
Date: 8 Sep 92 17:14:32 GMT
Organization: Dofasco Inc, Hamilton, Ont. Can.
Nntp-Posting-User: fraser_h

I've just picked up a cordless drill at a garage sale. It came
with 2 sets of nicads, one of which will hold a partial charge,
the other will not hold any charge (so I'm told by a local
surplus supply store where I had the batteries tested). The
batteries are about $70 each... is there any way they can be
recharged? What's the explanation for nicad's "memory" I hear about
all the time, and what's the difference between the chemistry in
a nicad and that in a lead-acid battery.

-- 
Hugh Fraser					Dofasco Inc.
(fraser_h@eis.dofasco.ca)			1330 Burlington St East
(416)544-3761 X6941				Hamilton, Ont. L8N 3J5 Canada
Newsgroups: sci.chem
Subject: Research Products International (address wanted)
From: news@massey.ac.nz (USENET News System)
Date: Fri, 11 Sep 92 01:30:19 GMT
Organization: DSIR, Palmerston North, New Zealand


I am trying to contact an american company called RPI (as above) which was 
thought to be based in chicago. The international directory system however 
turns up nothing  ... does anyone know of them ? where are they ??

	thanks

		Bruce Sinclair

Xref: sparky sci.chem:3415 rec.autos.tech:12254 misc.consumers:16191 sci.environment:11107 talk.environment:3580 rec.autos:21483