 |
   |
|
|
|
|
|
|
|
|
 |
 |
|
|
|
|
|
Mar 01, 1921 |
Solid materials have small/invisible cracks postulated
A.A. Griffith postulates that solid materials contain
small, often
invisible cracks which are extremely efficient levers in
prying atoms
apart.
add a comment |
|
|
|
|
|
|
1994 |
Sony first output in lithium battery
Kazunori Ozawa (Sony publishes "Lithium-Ion rechargeable
batteries with LiCOO2 and carbon electrodes : LiCoO2/C
system" in Solid State Ionics, 69 (1994) 212-221.
add a comment |
|
|
|
|
|
|
1926 |
Structurally analogous alloy phases
W. Hume-Rothery shows that structurally analogous alloy
phases are characterized by a fixed ratio of the number of
valence electrons present.
add a comment |
|
|
|
|
|
|
Sep 01, 1957 |
Structure of certain glasses
M.L. Huggins and T. Abe postulate that in glasses
containing, in addition to boric oxide, small relative
amounts of an alkali of alkaline earth oxide, some of the
boron atoms are surrounded by four oxygen atoms, all the
oxygen atoms bridging between two boron atoms, while at
concentrations beyond that of the thermal expansion minimum,
some oxygens are assumed to have only one boron neighbor.
add a comment |
|
|
|
|
|
|
Aug 01, 1922 |
Structure of different types of iron demonstrated
A. Westgren and G. Phragmen demonstrate that alpha, beta,
and delta
iron are all body-centered cubic, while gamma iron is face-
centered
cubic, and that solid-solution austenite is an interstitial
solid
solution.
add a comment |
|
|
|
|
|
|
Aug 01, 1929 |
Structure of polymers
W.H. Carothers, DuPont, discusses the structure of polymers
and the difference between addition and condensation
polymers.
add a comment |
|
|
|
|
|
|
Jun 01, 1927 |
Studies on corrosion-fatigue in nonferrous metals
D.J. McAdam Jr. discusses results of studies on corrosion-
fatigue limits and the relationship between fatigue and
corrosion-fatigue in nonferrous metals, especially nickel-
copper alloys and alloys of aluminum.
add a comment |
|
|
|
|
|
|
Jun 01, 1926 |
Studies on metals
D.J. McAdam Jr. discusses the results of studies on the
stress-strain cycle and corrosion-fatigue in metals.
add a comment |
|
|
|
|
|
|
Jul 27, 1928 |
Synthetic resin containing ethers patented
W.E. Lawson, Imperial Chemical Industries, patents a
synthetic resin containing ethers similar to the "glyptal"
type prepared by heating polybasic carboxylic acids or
anhydrides with ether alcohols to 175-250 degrees C to
obtain complete estrification.
add a comment |
|
|
|
|
|
|
1926 |
Time of minimum creep rate
R.W. Bailey states that, during time of minimum creep rate,
the strain hardening produced by creep is continuously
overcome by the annealing effect of high temperature.
add a comment |
|
|
|
|
|
|
Apr 17, 1956 |
Transparent plastic material made for attachment to aircraft canopies
F.W. Diggles develops a transparent plastic material made
of cellulose acetate butyrate ester and menthyl
methacrylate and suitable for attachment to aircraft
canopies.
add a comment |
|
|
|
|
|
|
Jul 01, 1922 |
Variation of diffusion coefficient result of activation process
S. Dushman and I. Langmuir, General Electric, show that the
variation
of the diffusion coefficient in alloy systems is the result
of an
activation process.
add a comment |
|
|
|
|
|
|
Feb 13, 1923 |
Vinyl chloride is formed
Vinyl chloride is formed by the reaction of hydrochloric
acid on nascent acetylene in a process developed by H.
Plauson.
add a comment |
|
|
|
|
|
|
Sep 22, 1928 |
Water-insoluble bonders process patented
I.G. Farben patents a process whereby water-insoluble or
poorly soluble bonders such as ethyl cellulose are formed
into an aqueous dispersion which is sprayed, kneaded, etc.,
and may then be dried and treated with substances capable
of dissolving or swelling the binding agent.
add a comment |
|
|
|
|
|
|
Jul 12, 1924 |
Ways of polymerizing styrene described
I. Ostromislensky describes ways of polymerizing styrene
and its homologs.
add a comment |
|
|
|
|
|
|
1920 |
X-ray spectroscopic investigations of cellulose
R.O. Herzog and W. Jancke conduct X-ray spectroscopic
investigations
of cellulose.
add a comment |
|
|
|
|
|
|
1921 |
Y-alloy of aluminum investigated
W. Rosenhain, S.L. Archbutt, and D. Hanson investigate the
Y-alloy of
aluminum, which contains 4% copper, 2% nickel, 1.5%
magnesium.
add a comment |
|
|
|
|
|
|
Jun 06, 1926 |
Zinc and magnesium hardening elements in aluminum
W. Sander and K.L. Meissner describe the use of zinc and
magnesium as hardening elements in heat-treated aluminum
alloys.
add a comment |
|
|
|
|
|
|
|
|
