In article <5654ak$dfj@mtinsc01-mgt.ops.worldnet.att.net>, peterson.rob@worldnet.net says... >I haven't looked anything up yet but clearly the dielectric changes >from 80 (at least into the GHz range) to something like 2 at optical >frequencies where the index of refraction is around 1.5 (since n goes >as squrare root of dielectric). eg, the velocity at microwave >frequencies goes as c/root(81) or about 1/9 of speed of light. >Not much help but this does tell you that dielectric drops a lot >towards optical frequencies. The only other thing I can think of is >that the loss tangent which is serious for salt water at microwave >obviously drops to zip at optical (the old sigma/omega term). >Good luck and please let me know if you get any simple answers to >this. >Rob > Hi, Thanks for the initial info, I've been having a look in a couple of reference books and can probably work out the dielectric variation by using an extension of the equation for plasma frequencies in solids. This directly relates the electronic polarization of molecules to the relative permittivity of a material and hopefully this includes fluids as well! Does this make any sense to you? Unfortunately my background does not extend too heavily into solid state physics so theres a bit of work to be done yet. -Sigh..Return to Top
I would like to remove the chrome plating from a steel casting (automotive differential) but am concerned with hydrogen embrittlement. Can anyone tell me if my concerns and unwarranted? How can chrome be removed without causing base metal problems?Return to Top
Hello everybody, I am looking for platinum single crystals of different sizes. Can you tell me where I could buy such crystals and what do they cost. Please mail to: christiane.fricke@uni-duesseldorf.de Thanks in advance for your help. Christiane FrickeReturn to Top
Mark Croucher wrote: > > Stephen Boltinghouse wrote: > > > > A load of old bollocks about an illegal scam. Try alt.idiot.fuckwitted Please keep the obscenity off this newsgroup. It is disgusting and has no place in a professional setting. -- Gary L. Kobet TPS Engineering Unit, Widows Creek Fossil Plant Steam Plant Road, P.O. Box 2000, WCF 1A-STA, Stevenson AL 35772 Phone: (205)-437-4420; FAX: (205)-437-4409 Pager: 800-323-4853, code 30687, e-mail: gkobet@tva.govReturn to Top
Louis M. Spoto wrote: > > I would like to remove the chrome plating from a steel casting > (automotive differential) but am concerned with hydrogen embrittlement. > Can anyone tell me if my concerns and unwarranted? How can chrome be > removed without causing base metal problems? -- Ted Mooney The chrome plating process certainly caused more hydrogen embrittlement than the de-plating process, so I wouldn't worry too much. Chrome is removeable with either hydrochloric acid, or electrolytically in a caustic solution. Any chrome plating shop can do it for you, and will bake out the hydrogen if necessary (but I doubt it will be). Look up 'plating' in your local yellow pages or in our directory at www.finishing.com/Shops. Don't try to do it yourself. ------------ Visit 'the home page of the finishing industry' http://www.finishing.com ------------Return to Top
Evan Ross wrote: > > I am doing some water electrolysis using stainless steel electrodes, > distilled water and sulfuric acid found at a hardware store (for battery > acid) as the electrolyte. When the reaction proceeds, a pink-red substance > is produced and turns the entire solution that color. What is it? Either > the sulfuric acid is not pure or something is reacting with the stainless > steel. Please help! Evan: My guess is that the pink-red is just ferric iron. "Stainless" steel is far from stainless under many conditions, and you are probably oxidizing the iron at the anode. You don't give your acid strength, but I suppose it's about 3M. My question is: What are you trying to accomplish? Dick Van Effen Midland, MI, USAReturn to Top
Professor well-known in Russia and in Israel, specialist in following
fields :
Recycling of metals (at present head of the company for Ecological Metal
Recycling)
Application of conducting polymers (head of the company Power Batteries
Ltd.)
Improvements of fuel cells
Superconductivity of ceramics
(Please, see Jerusalem Post From October 25, 1996 , magazine )
Will be very glad to work according to contract in some countries at the
position of
consultant or head of project during 1-2 years.
Return to TopThe slow response time is most likely a function of the thickness of the semipermeable membrane or the thickness of liquid between the membrane and the pH sensor. Both of these thicknesses need to be minimized to increase response time. Contact Lazar Research Labs. for more details at service@lazarlab.com or try their web site at http://lazarlab.com or fax 1-213-931-1434.Return to Top
A free pH booklet is available which contains valuable information on basic pH measurement theory, pH measurement techniques, selecting the proper pH electrode for a particular application, and a pH troubleshooting guide. The booklet is available from Lazar Research Labs. Inc. by emailing service@lazarlab.com or faxing 1-213-931-1434. The booklet can also be obtained from the Lazar web site at http://www.lazarlab.comReturn to Top
Contact Lazar Research Labs. Inc. at service@lazarlab.com They may be able to help you on high temp. pH glass.Return to Top
Contact Lazar Research Labs. Inc. at service@lazarlab.com They may be able to help you on high temp. pH glass.Return to Top
Contact Lazar Research Labs. Inc. at service@lazarlab.com They may be able to help you on high temp. pH glass.Return to Top
Sulfite and sulfide electrodes are available from Lazar Research Labs.Inc. Email service@lazarlab.com or fax 1-213-931-1434Return to Top