نتایج جستجو برای: spontaneous nucleation

تعداد نتایج: 132664  

Journal: :Optics letters 2002
Gabriel Molina-Terriza Dmitri V Petrov Jaume Recolons Lluis Torner

We report what is believed to be the first experimental observation of spontaneous nucleation of arrays of optical vortices in the process of second-harmonic generation in a crystal with moderate Poynting vector walk-off, pumped with focused beams containing screw phase dislocations. Our experiments were conducted in lithium triborate under conditions of small-efficiency second-harmonic generat...

2008
Lizhong Mao Tianyong Zhou Ning Ye

Single crystals of the title compound, Li(3)Sc(BO(3))(2), have been obtained by spontaneous nucleation from a high-temperature melt. The title compound adopts a framework structure and is composed of distorted [ScO(6)] octa-hedra, [LiO(4)] tetra-hedra, [LiO(4)] recta-ngles and isolated [BO(3)] triangles. Except for the Sc and one Li atom (both on inversion centres), all atoms are in general pos...

Journal: :Atmospheric Chemistry and Physics 2022

Abstract. Large amounts of dust aerosols are lifted to the upper troposphere every year and play a major role in cirrus formation by acting as efficient ice nuclei. However, relative importance heterogeneous nucleation spontaneous homogenous dust-related clouds is still not well evaluated globally. Here, based on spaceborne observations, we propose method identify two ice-nucleating regimes clo...

Journal: :Crystals 2022

It has been reported that cavitation bubbles (air–liquid interface) by femtosecond laser and ultrasonic irradiations are effective for metastable phase crystallization in polymorph control. also noted generated mechanical shock when dropping a vial. Here we describe the of acetaminophen drop impact. In condition where spontaneous nucleation did not occur, impact produced form (form II) trihydra...

2005
Frederick H. Streitz James N. Glosli Mehul V. Patel Bor Chan Robert K. Yates Bronis R. de Supinski James Sexton John A. Gunnels

We investigate solidification in tantalum and uranium systems ranging in size from 64,000 to 524,288,000 atoms on the IBM BlueGene/L computer at LLNL. Using the newly developed ddcMD code, we achieve performance rates as high as 103 TFlops, with a performance of 101.7 TFlop sustained over a 7 hour run on 131,072 cpus. We demonstrate superb strong and weak scaling. Our calculations are significa...

2017
Di Chen Nan Li Dina Yuryev J Kevin Baldwin Yongqiang Wang Michael J Demkowicz

Material degradation due to precipitation of implanted helium (He) is a key concern in nuclear energy. Decades of research have mapped out the fate of He precipitates in metals, from nucleation and growth of equiaxed bubbles and voids to formation and bursting of surface blisters. By contrast, we show that He precipitates confined within nanoscale metal layers depart from their classical growth...

Journal: :Biophysical journal 1999
D Sept J Xu T D Pollard J A McCammon

We measured the lengths of actin filaments formed by spontaneous polymerization of highly purified actin monomers by fluorescence microscopy after labeling with rhodamine-phalloidin. The length distributions are exponential with a mean of approximately 7 microm (2600 subunits). This length is independent of the initial concentration of actin monomer, an observation inconsistent with a simple nu...

2005
Roberto Emparan Jaume Garriga

In theories with a hidden ghost sector that couples to visible matter through gravity only, empty space can decay into ghosts and ordinary matter by graviton exchange. Perturbatively, such processes can be very slow provided that the gravity sector violates Lorentz invariance above some cut-off scale. Here, we investigate non-perturbative decay processes involving ghosts, such as the spontaneou...

Journal: :Nature materials 2002
U Kaiser D A Muller J L Grazul A Chuvilin M Kawasaki

Ion implantation is widely used to introduce electrically or optically active dopant atoms into semiconductor devices. At high concentrations, the dopants can cluster and ultimately form deactivating precipitates, but deliberate nanocrystal formation offers an approach to self-assembled device fabrication. However, there is very little understanding of the early stages of how these precipitates...

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