Date: Thu, 25 Sep 2003 09:52:26 -0400

Author: Gerald Zani

Subject: Re: Unmixing

Post:

Tappers,

Thanks for the many good tips.

The Unmixer apparatus at Brown is indeed designed after the original Merzbacker
plans and it is in good working order. We acquired it about 12 years ago
from a regional outreach that was done as a joint AAPT/APS consortium of
colleges and Universitys in the New England region.

I think my dye was not thick enough. Thanks for the help.

Jerry

At 09:14 PM 9/24/2003 -0400, you wrote:
>Jerry,
>
>I presume that your device has worked properly on a regular basis in the
>past. Therefore, I would suggest changing the glycerine to make sure that
>it is pure. Make up a new shot of dye mix that is pretty thick so it will
>not tend to flow on its own.
>
>If the design of your unmixer is according to the original Merzbacker
>plans it should work fine.
>
>Dick Berg
>
>***********************************************************************
>Dr. Richard E. Berg, Professor of the Practice
>Director, Physics Lecture-Demonstration Facility
>U.S. mail address:
>Department of Physics
>University of Maryland
>College Park, MD 20742-4111
>Phone: (301) 405-5994
>FAX: (301) 314-9525
>e-mail reberg@physics.umd.edu
>www.physics.umd.edu/lecdem
>***********************************************************************

Gerald Zani e-mail: Gerald_Zani@brown.edu
Manager of Demonstrations phone: (401) 863-3964
Department of Physics FAX: (401) 863-2024
Brown University Providence, RI 02912-1843 USA

URL http://www.physics.brown.edu/users/staff/zani/index.html
URL http://www.physics.brown.edu/Studies/Demo/

Do a little more of that work which you have confessed to be good,
Which you feel that society and your most Just Judge rightly demand of you.
Cultivate the tree which you have found to bear fruit in your soil.
If you have any experiments you would like to try, try them.
Now's your chance.
Henry David Thoreau, Journal entry, 1850.
From sampere@physics.syr.edu Thu Sep 25 09:29:38 2003
Message-ID: <3F7313FF.2050207@physics.syr.edu>
Date: Thu, 25 Sep 2003 12:12:47 -0400
From: sampere
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To: tap-l@listproc.appstate.edu
Subject: Re: linseed oil (was exothermic/endothermic)
References:
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Gee, now I'm sorry I asked.

Really though, very cool and quite interesting.

Thanks,

Sam

Edward Sabol wrote:

>>>
>>>
>>>
>>> Excerpt from website:
>>
>
> http://www.alan.net/prgfeat/tungoil.html
>
> It appears the oxygen is necessary
>
>
> The principal drying component in Tung oil is eleostearic acid, a
> conjugated octadecatrienoic acid. The oleic acid contained in the
> fatty oils and unsaturated fatty acids plays a small part in the
> drying process as well. The saturated fatty acids present act only as
> plasticizers.
>
> The drying of films typically progress in three overlapping steps:
>
> 1.) Induction - through a process known as autocatalysis, the oxygen
> uptake steadily increases. Factors such as temperature, light and
> heavy metals/inhibitors in the oil, affect the overall uptake rate.
>
> 2.) Initiation - as the film continues to take up oxygen, its mass
> increases. The double bonds in the film begin to rearrange and polar
> groups such as hydroxyl and hydroperoxy develop in the film. This
> leads to the association of molecules through forces such as hydrogen
> bonding.
>
> 3.) Cross-Linking - As the number of double bonds in the film begin to
> diminish, larger molecules form and volatile and non-volatile carbonyl
> compounds are generated.
>
> The exact chemical reactions in these steps, as well as the structure
> of the film-forming polymers, are not fully understood. The initial
> autooxidation step in nonconjugated oils (Linseed), is dehydrogenation
> of the unsaturated fatty acid by oxygen, which forms a radical. This
> starts a radical chain reaction that increases incrementally with
> time, leading to the formation of a hydroperoxide.
>
> At low levels, the hydroperoxides produced during autooxidation
> decompose to form free alkoxy and hydroxyl radicals. Higher levels of
> hydroperoxides form free radicals through bimolecular
> disproportionation. The resultant free radicals react in various ways
> to accelerate the autooxidation process.
>
> The drying of Tung oil varies considerably from Linseed oil. Tung oil
> typically absorbs approximately 12% oxygen (Linseed oil absorbs
> approx. 16%) and quickly forms a skin on the surface. Since less
> oxygen is absorbed, the viscosity of the oil increases at a faster
> rate. Unlike the hydroperoxide formation during autooxidation in
> Linseed oil, Tung oil forms cyclic peroxides. (The methyl eleostearate
> formed has a higher molecular mass than linoleic acid esters).
>
> The direct attack on the double bonds by oxygen forms cyclic
> peroxides. The resultant reaction of the peroxides with allylic
> methylene groups, leads to the formation of radicals. This creates a
> radical chain reaction, that forms polymers. The molecular mass
> created is less than that achieved through Linseed oil polymerization.
> To speed up the film formation, manufacturers add driers to the oils.
>
>>> Transport information
>>>
>>> Non-hazardous for air, sea and road freight.
>>>
>>> Personal protection
>>>
>>> Gloves. Adequate ventilation.
>>>
>>> [Return to Physical & Theoretical Chemistry Lab. Safety home page.]
>>> ------------------------------------------------------------------------
>>>
>>> This information was last updated on September 3, 2003. We have
>>> tried to make it as accurate and useful as possible, but can take no
>>> responsibility for its use, misuse, or accuracy.
>>
>>
From rtarara@saintmarys.edu Thu Sep 25 11:11:49 2003
Date: Thu, 25 Sep 2003 12:55:19 -0500
From: Rick Tarara
Subject: email virus/worm
To: tap-l@appstate.edu
Cc: "phys-l@lists.nau.edu: Forum for Physics Educators" ,
PHYSHARE@LISTS.PSU.EDU
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For all of those on these lists being inundated by Microsoft Update emails
and 'failure to deliver' notices (and I know there are many), check out the
message below from the M$ newsgroup on viruses. At very least, it will
prove you are not alone. Unfortunately, I must suspect that some members of
these lists have been infected because of the volume I keep getting--so
please, open NO attachments with executable files.

Rick Tarara

********************************************************

Copied message concerning multiple receipts of Microsoft Update and
'reciept failure' messages.
********************************************************


This worm has two main effects, and some secondary effects


I. Main effects

A. It infects venerable systems and networks.

B. It generates a FLOOD of infected e-mail that is sent to e-mail
addresses it harvests from infected machine and networks. These infected
e-mails are of two types

1. An HTML message that looks like a legitimate Microsoft Security
Bulletin; the hotlinks in this message are valid Microsoft links, and will
even lead you to a description that will allow you to identify this e-mail
as bogus. The message has an attached 104 KByte file that contains the
worm. If you don't have all appropriate Microsoft security patches and
Service Packs installed, it may be possible for your system to be infected
EVEN IF YOU DON'T OPEN THE MESSAGE. So far, the body of this message is
always the same, though the Subject and From lines differ widely. This
message, so far can be easily be blocked by detecting the string 'Run
attached file' in the body ( in fact, it would be a good practice to
consider ANY e-mail that contains this string AND has an attachment to very,
very likely to carry an infection.

2. A plain text message that purports to be a notification of an
'Undeliverable e-mail', with an attachment that purports to be a copy of the
undeliverable e-mail; this attached file is 104 KBytes long and contains the
worm. The Subject line, From line, and body present in thousands of
combinations, and probably will continue to mutate. Even worse, real e-mail
addresses harvested from infected systems and networks are tagged onto this
type of message, causing one of the secondary effects.

II. Secondary effects
A. Spam effect
1. Mailboxes with an e-mail address that has been harvested from
infected systems and networks begin to be flood with infected e-mail.
[Personal example: my machines are not infected, but this worm began to
flood my mailbox 17SEP03. I now receive more than 1500 infected e-mail
messages per day. I must empty my mailbox every 5 minutes, 24/7 to avoid
the possibility of having legitimate e-mail bounced. I had to install an
application just to segregate the cleaned, previously infected e-mail
from legitimate e-mail (standard spam blockers can't do this.)
B. Notifications from mail services that DO scan for infected
messages, but unfortunately do not realize that the e-mail addresses given
for the sender are either bogus or e-mail addresses harvested by the worm.
Thus, completely innocent mailboxes have insult added to injury.

****

What can you do locally as an individual (i.e. in as SmallOfficeHomeOffice
environment, and /or as a recreational user)?
#1. You can use a remote virus scan from one of the antivirus program
publishers
THEN
#2. You can remove any infections discovered
THEN
#3. You install a good antivirus program, keep it active, keep the virus
definitions up-to-date (at the moment you should update these definitions
EVERY day), and set to scan all incoming e-mails and downloads.
THEN
#4. You can install all appropriate Microsoft security patches and Service
Packs.
THEN
#5. You can consider additional security (DCHP server, firewall, boric acid
[for roaches], .....

If you begin to be flooded with these infected messages, COMPLAIN to your
ISP; sent them this URL
http://xtra.co.nz/products/0,,8969,00.html of an ISP that scans incoming
e-mail before passing it to a mailbox. Ask for an increased in mailbox size
(if you are getting 1500 of these infected e-mails per day, you will need a
mailbox size over 150 MBytes just to avoid the necessity of completely
emptying it EVERY DAY. Ask about the implicit duty of the ISP to provide
reliable e-mail service, and if they have received notification of any
pending class actions you might join. Ask if they will unbundle their
services so you can opt out of e-mail service save that cost. That's about
all you can do about the e-mail flood; only your ISP or other e-mail
provider can come close to solving this problem.

When the e-mail flood becomes too painful, find an ISP or other e-mail
provider that DOES scan and discard infected e-mail before passing it to
your mailbox, and then change to that ISP and/or e-mail provider. Changing
your e-mail address is no solution; as soon as your new e-mail address is
harvested from an infected system or network, the problem starts again.

When a mailserver is scanning and not just deleting infected e-mail, but is
also sending an e-mail to notify the sender, write the administrator a nasty
note asking them to stop sending these notices.

****
That's about it; you can proof your system against infection, but only
changes at the mailserver level can stop reception of flood of infected
e-mails and increasing numbers of inappropriate notices that you've sent
infected e-mail.

Phil Weldon, pweldon@mindspring
From peacock@physics.utah.edu Thu Sep 25 11:53:58 2003
Message-ID: <3F7336BB.B39091FB@physics.utah.edu>
Date: Thu, 25 Sep 2003 12:40:59 -0600
From: "Zigmund J. Peacock"
Organization: University of Utah , Department of Physics
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To: tap-l@listproc.appstate.edu
Subject: Re: email virus/worm
References: <005001c3838e$2f19a3b0$96503593@RickTarara>
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Tappers, I would echo Ricks comments and further advise you to dump your entire
email address books, that is how it spreads.
I copy email address' I want to keep to a Word file.
I know I know! I have to copy address to a letter everytime I send, but it
reduces the headache associated with virus and worms.
Try it you'll like it. Zig

Zigmund J. Peacock WWW.physics.utah.edu/people/staff/peacock.html
University of Utah/Physics peacock@physics.utah.edu
115 SOUTH 1400 EAST #201 Tel 801 581 6602
SALT LAKE CITY UT 84112-0830 Fax 801 581 4801

"We sleep safely in our beds because rough men stand ready in
the night to do violence to those who would do us harm"
-- George Orwell

"All that is necessary for the triumph of evil is that good
men do nothing!"
-- Edmund Burke

From bmagnes@exchange.calstatela.edu Thu Sep 25 12:38:56 2003
Message-ID: <8D98F301100827428749C00FCF9A440089CBCC@exchange.calstatela.edu>
From: "Magness, Brian W."
To: "'tap-l@listproc.appstate.edu'"
Subject: Van de Graaff
Date: Thu, 25 Sep 2003 12:22:08 -0700
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This message is in MIME format. Since your mail reader does not understand
this format, some or all of this message may not be legible.

------_=_NextPart_001_01C3839A.4FA065E0
Content-Type: text/plain

Hello tappers,



Does anyone have ideas about replacement belts for the Winsco Van de Graaff
generator? The belts can be purchased from Sargent Welch for about $10. The
problem is these rubber belts only last from 3 to 6 months in our science
building's (we share with chemistry) caustic environment. Our budget (none
for the moment) does not permit us to stock up and these replacement belts
go bad on the shelf as well. Any ideas for homemade belts?



Thanks,



Brian Magness




------_=_NextPart_001_01C3839A.4FA065E0
Content-Type: text/html
Content-Transfer-Encoding: quoted-printable




charset=3Dus-ascii">












style=3D'font-size:10.0pt;
font-family:Arial'>Hello tappers,



style=3D'font-size:10.0pt;
font-family:Arial'> 



style=3D'font-size:10.0pt;
font-family:Arial'>Does anyone have ideas about replacement belts for =
the Winsco
Van de Graaff generator? The belts can be purchased from Sargent Welch =
for
about $10. The problem is these rubber belts only last from =
style=3D'font-size:10.0pt;font-family:Arial'>3 size=3D2 face=3DArial> style=3D'font-size:10.0pt;font-family:Arial'> to 6 months
in our science building's (we share with chemistry) caustic =
environment.
Our budget (none for the moment) does not permit us to stock up and =
these
replacement belts go bad on the shelf as well. Any ideas for homemade =
belts?



style=3D'font-size:10.0pt;
font-family:Arial'> 



style=3D'font-size:10.0pt;
font-family:Arial'>Thanks,



style=3D'font-size:10.0pt;
font-family:Arial'> 



style=3D'font-size:10.0pt;
font-family:Arial'>Brian Magness



style=3D'font-size:10.0pt;
font-family:Arial'> 









------_=_NextPart_001_01C3839A.4FA065E0--
From dwilley+@pitt.edu Thu Sep 25 12:47:42 2003
Date: Thu, 25 Sep 2003 15:30:39 -0400
From: David Willey
Subject: Re: email virus/worm
In-reply-to: <005001c3838e$2f19a3b0$96503593@RickTarara>
To: tap-l@listproc.appstate.edu
Cc: tap-l@appstate.edu,
"phys-l@lists.nau.edu: Forum for Physics Educators"
,
PHYSHARE@LISTS.PSU.EDU
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I don't regard (my computer) with reverential respect, so I guess it's
not venerable ;-)

Rick Tarara wrote:

> A. It infects venerable systems and networks.
>
>
From MLowry@D115.ORG Thu Sep 25 13:23:33 2003

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