The formation process of a paleoindian open-air site in Central Brazil: integrating lithic analysis, radiocarbon and luminescence dating

2013 ◽  
Vol 40 (1) ◽  
pp. 190-203 ◽  
Author(s):  
Lucas Bueno ◽  
James Feathers ◽  
Paulo De Blasis
Keyword(s):  
Formation Process ◽  
Lithic Analysis ◽  
Luminescence Dating ◽  
Central Brazil

Formation process of periodic non-conservative antiphase boundary structure in L-Pd5Ce

1990 ◽  
Vol 48 (4) ◽  
pp. 162-163
Author(s):  
Masaru Itakura ◽  
Noriyuki Kuwano ◽  
Kensuke Oki
Keyword(s):  
Formation Process ◽  
Domain Size ◽  
Antiphase Boundary ◽  
Boundary Structure ◽  
Temperature Phase ◽  
Arc Melting ◽  
Iced Water ◽  
Antiphase Domains ◽  
Low Temperature Phase ◽  
Degree Of Order

The low temperature phase of Pd5Ce (L-Pd5Ce) has a one-dimensional long period superstructure (1D-LPS) derived from Ll2. The periodic antiphase boundaries (APBs) are parallel to (110) planes and have a shift vector of 1/2[110]. Hereafter, the indices are referred to the basic lattices of Ll2 As insertion of the APB causes a change in composition, such an APB is called “non-conservative”. Then, a domain size M depends upon the Ce concentration in the alloy. It was found that M increases also with temperature. The temperature dependency of M is attributed to a change of the degree of order within the antiphase domains. In this work, morphology of the non-conservative APBs is observed to clarify the formation process of the 1D-LPS.The alloy of Pd-16.7 at%Ce was prepared by arc melting in argon atmosphere. Disc specimens made from the alloy ingot were first held at 985 K for 260 ks and quenched in iced water to obtain the state of M=∞ or Ll2, followed by annealing for various lengths of time. The annealing temperature was 873 K where the equilibrium value for M is about 3 in unit of (110) lattice spacing of Ll2. Observation was carried out using microscopes JEM-2000FX, JEM-4000EX (HVEM Lab., Kyushu Univ.) and JEM-2000EX (Dept. of Mater. Sci. Tech., Kyushu Univ.).

Effect of mood on stereotype formation process

2004 ◽  
Author(s):  
Julia Braverman ◽  
David DeSteno
Keyword(s):  
Formation Process

Frontier and Western History in Central Brazil

2019 ◽  
Vol 9 (1) ◽  
pp. 211-214
Author(s):  
Donald Worster
Keyword(s):  
Rio De Janeiro ◽  
Western History ◽  
Central Brazil

Frontier and Western History in Central Brazil Dutra e Silva, S. No Oeste, a terra e o céu: a expansão da fronteira agrícola no Brasil Central (Rio de Janeiro: Mauad X, 2017)

Effect of modified aerosil on the formation process, viscoelastic and mechanical properties of polymer matrices based on PMMA/PU IPNs

2019 ◽  
Vol 41 (4) ◽  
pp. 230-239
Author(s):  
L.F. Kosyanchuk ◽  
◽  
O.I. Antonenko ◽  
T.D. Ignatova ◽  
N.V. Babkina ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Formation Process ◽  
Polymer Matrices
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