welcome to 3 · welcome to 3.091 lecture 22 november 2, 2009 engineering glass properties;...
TRANSCRIPT
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Welcome to 3.091
Lecture 22
November 2, 2009
Engineering Glass Properties; Introduction to Kinetics
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strain point
! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! melting ! ! ! 2
Pa s
increased concentration of modifier
decreased network connectivity
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VsurfVint
Tgslow Tgfast
(interior)
(surface)
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! energy & the environment
why do we study kinetics?
! productivity & resource utilization " competitiveness
! societal: science in service of humanity
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accelerometer " electric current
NaN3 300°C 3/2 N2 + Na
10 Na + 2 KNO3 5 Na2O + K2O + N2
5 Na2O + K2O + n SiO2 alkaline silicate glass
on the topic of airbags
!!!
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Figure 14.19
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Radioactive Isotope Half-Life
Half-lives and applications of some radioactive isotopes
Typical Uses
Hydrogen-3 (tritium) 12.32 yr Biochemical tracer
PET scans (biomedical imaging)
Dating of artifacts
Cardiovascular system tracer
Biochemical tracer
Dating of rocks
Red blood cell lifetime tracer
Radiation therapy for cancer
Biomedical imaging
Thyroid studies tracer
Radiation therapy for cancer
Dating of rocks and Earth's crust
Smoke detectors
*Denotes metastable, where an excited nucleus decays to the ground state ofthe same isotope.
20.33 min
5.70 x 103 yr
1.248 x 109 yr
1.600 x 103 yr
4.468 x 109 yr
6.006 h
5.2712 yr
44.495 days
14.951 hr
14.26 days
8.0207 days
432.2 yr
Carbon-11
Carbon-14
Sodium-24
Phosphorus-32
Potassium-40
Iron-59
Cobalt-60
Technetium-99m*
Iodine-131
Radium-226
Uranium-238
Americium-241
Image by MIT OpenCourseWare. Adapted from Table 14.7 in Averill, Bruce, and Patricia Eldredge. Chemistry: Principles, Patterns, and Applications. San Francisco, CA: Pearson/Benjamin Cummings, 2007. ISBN: 080538039.
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Figure 14.13
Age (thousands of years)
121086420
Bet
a di
sint
egra
tions
per
min
ute
per
gram
of c
arbo
n
3
4
5
6
789
10
12
1416
Earliest Polynesian cultureDead Sea Scrolls
Ptolemy Sequoia treeStonehenge
Sneferu graves (Middle East)
Fallen tree from eruption thatformed Crater Lake, Oregon
Indian sandals(Fort Rock, Oregon)
Folsom ManGiant sloth(Gypsum Cave,Nevada)
Image by MIT OpenCourseWare. Adapted from Fig. 14.13 in Averill, Bruce, and Patricia Eldredge. Chemistry: Principles,Patterns, and Applications. San Francisco, CA: Pearson/Benjamin Cummings, 2007. ISBN: 080538039.
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Image removed due to copyright restrictions. Please see p. 54 in Van Biema, David. "Science and the Shroud." Time, April 20, 1998.
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Image removed due to copyright restrictions.Please see p. 58 in Van Biema, David. "Science and the Shroud." Time, April 20, 1998.
3 labs in 3 countries: 1260-1390 c.f. 1354 Geoffroi de Charny
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firewater + smokebacteria, mold paraffinexpert error?
But wait! There was a fire in 1532 at Chambéry
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