Anomalous Annihilation of Positrons in Several Solid Hydrocarbons

1972 ◽  
Vol 50 (14) ◽  
pp. 1619-1622 ◽  
Author(s):  
G. DeBlonde ◽  
S. Y. Chuang ◽  
B. G. Hogg ◽  
D. P. Kerr ◽  
D. M. Miller
Keyword(s):  
Solid State ◽  
Angular Correlation ◽  
Liquid State ◽  
Organic Materials ◽  
Lifetime Measurements ◽  
Momentum Component ◽  
Correlation Data ◽  
Solid Hydrocarbons

In previous experiments with positrons annihilating in liquid organic materials (Hogg et al.) the measurements of IN (intensity of the low momentum component from angular correlation data) and I2 (intensity of the long lived component from lifetime measurements) have resulted in IN = I2/3 within experimental error.For samples of CH4, C6H6, and C6H12 measurements in the liquid state yield the expected equality between IN and I2/3. However, in the solid state for these substances there is a marked disagreement between IN and I2/3. The value of IN, in all cases, is essentially zero suggesting that no positronium is formed, but the value of I2 remains large.

Angular correlation and lifetime measurements in Ne

1968 ◽  
Vol 111 (1) ◽  
pp. 529-550
Author(s):  
W KUTSCHERA ◽  
D PELTE ◽  
G SCHRIEDER
Keyword(s):  
Angular Correlation ◽  
Lifetime Measurements

Positron Annihilation with Core Electrons in the Noble Metals

1974 ◽  
Vol 52 (4) ◽  
pp. 336-339 ◽  
Author(s):  
E. H. Becker ◽  
A. G. Gould ◽  
E. M. D. Senicki ◽  
B. G. Hogg
Keyword(s):  
Simple Model ◽  
Fermi Surface ◽  
Single Crystals ◽  
Positron Annihilation ◽  
Angular Correlation ◽  
Noble Metals ◽  
Correlation Data ◽  
Core Electrons

Experimental angular correlation curves for identically oriented single crystals of copper, silver, and gold have been obtained using "a point geometry" apparatus. The differences between these angular correlation data are compared to the differences predicted using a simple model of the Fermi surface combined with calculations of the theoretical core distributions.

Joining of Ti3SiC2 with Ti–6Al–4V Alloy

2002 ◽  
Vol 17 (1) ◽  
pp. 52-59 ◽  
Author(s):  
N.F. Gao ◽  
Y. Miyamoto
Keyword(s):  
Solid State ◽  
Rate Constant ◽  
Liquid State ◽  
Parabolic Rate Constant ◽  
Diffusion Path ◽  
Solid State Diffusion ◽  
Diffusion Controlled ◽  
State Diffusion ◽  
Rate Controlled ◽  
Higher Temperature

The joining of a Ti3SiC2 ceramic with a Ti–6Al–4V alloy was carried out at the temperature range of 1200–1400 °C for 15 min to 4 h in a vacuum. The total diffusion path of joining was determined to be Ti3SiC2/Ti5Si3Cx/Ti5Si3Cx + TiCx/TiCx/Ti. The reaction was rate controlled by the solid-state diffusion below 1350 °C and turned to the liquid-state diffusion controlled with a dramatic increase of parabolic rate constant Kp when the temperature exceeded 1350 °C. The TiCx tended to grow at the boundarywith the Ti–6Al–4V alloy at a higher temperature and longer holding time. TheTi3SiC2/Ti–6Al–4V joint is expected to be applied to implant materials.

The kinetics and mechanism of nanoconfined molten salt reactions: trimerization of potassium and rubidium dicyanamide

2015 ◽  
Vol 17 (15) ◽  
pp. 10209-10217 ◽  
Author(s):  
Benjamin Yancey ◽  
Sergey Vyazovkin
Keyword(s):  
Solid State ◽  
Molten Salt ◽  
Liquid State ◽  
Kinetics And Mechanism

Nanoconfinement accelerates the liquid state trimerization of potassium and rubidium dicyanamide but decelerates the solid state trimerization of sodium dicyanamide.

Bloodstain age analysis: toward solid state fluorescent lifetime measurements

2013 ◽  
Author(s):  
Kevin Guo ◽  
Natalia Zhegalova ◽  
Samuel Achilefu ◽  
Mikhail Y. Berezin
Keyword(s):  
Solid State ◽  
Lifetime Measurements

scholarly journals Redox-promoted associative assembly of metal–organic materials

2016 ◽  
Vol 7 (1) ◽  
pp. 707-712 ◽  
Author(s):  
Martin Glavinović ◽  
Feng Qi ◽  
Athanassios D. Katsenis ◽  
Tomislav Friščić ◽  
Jean-Philip Lumb
Keyword(s):  
Solid State ◽  
Self Assembly ◽  
Organic Materials ◽  
Metal Oxidation ◽  
Metal Organic ◽  
One Step

We develop an associative synthesis of metal–organic materials that combines solid-state metal oxidation and coordination-driven self-assembly into a one-step, waste-free transformation.

Annihilation of positronium inα-SiO2investigated by combined angular correlation and lifetime measurements

1996 ◽  
Vol 54 (21) ◽  
pp. 15051-15055 ◽  
Author(s):  
S. Dannefaer ◽  
T. Friessnegg ◽  
D. Kerr ◽  
Akira Uedono ◽  
Xiaohe Li ◽  
...  
Keyword(s):  
Angular Correlation ◽  
Lifetime Measurements

scholarly journals Cloud Particles Differential Evolution Algorithm: A Novel Optimization Method for Global Numerical Optimization

2015 ◽  
Vol 2015 ◽  
pp. 1-36 ◽  
Author(s):  
Wei Li ◽  
Lei Wang ◽  
Quanzhu Yao ◽  
Qiaoyong Jiang ◽  
Lei Yu ◽  
...  
Keyword(s):  
Solid State ◽  
Differential Evolution ◽  
Liquid State ◽  
Differential Evolution Algorithm ◽  
Optimization Method ◽  
Benchmark Problems ◽  
Gaseous State ◽  
Mutation Strategy ◽  
Evolution Algorithm ◽  
Cloud Particles

We propose a new optimization algorithm inspired by the formation and change of the cloud in nature, referred to as Cloud Particles Differential Evolution (CPDE) algorithm. The cloud is assumed to have three states in the proposed algorithm. Gaseous state represents the global exploration. Liquid state represents the intermediate process from the global exploration to the local exploitation. Solid state represents the local exploitation. The best solution found so far acts as a nucleus. In gaseous state, the nucleus leads the population to explore by condensation operation. In liquid state, cloud particles carry out macrolocal exploitation by liquefaction operation. A new mutation strategy called cloud differential mutation is introduced in order to solve a problem that the misleading effect of a nucleus may cause the premature convergence. In solid state, cloud particles carry out microlocal exploitation by solidification operation. The effectiveness of the algorithm is validated upon different benchmark problems. The results have been compared with eight well-known optimization algorithms. The statistical analysis on performance evaluation of the different algorithms on 10 benchmark functions and CEC2013 problems indicates that CPDE attains good performance.

Angular correlation and lifetime measurements in 30Si using a Ge(Li) detector

1967 ◽  
Vol 90 (2) ◽  
pp. 321-333 ◽  
Author(s):  
C. Broude ◽  
P.J.M. Smulders ◽  
T.K. Alexander
Keyword(s):  
Angular Correlation ◽  
Lifetime Measurements
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