Sensitive high-resolution ion microprobe U-Pb dating of baddeleyite and zircon from a monzonite porphyry in the Xiaoshan area, western Henan Province, China: Constraints on baddeleyite and zircon formation process

AbstractWe studied the formation process of star clusters using high-resolutionN-body/smoothed particle hydrodynamics simulations of colliding galaxies. The total number of particles is 1.2×108for our high resolution run. The gravitational softening is 5 pc and we allow gas to cool down to ~10 K. During the first encounter of the collision, a giant filament consists of cold and dense gas found between the progenitors by shock compression. A vigorous starburst took place in the filament, resulting in the formation of star clusters. The mass of these star clusters ranges from 105−8M⊙. These star clusters formed hierarchically: at first small star clusters formed, and then they merged via gravity, resulting in larger star clusters.

Download Full-text

Sensitive High Resolution Ion Microprobe (SHRIMP IIe/MC) of the Institute of Geosciences of the University of São Paulo, Brazil: analytical method and first results

Geologia USP Série Científica ◽

10.5327/z1519-874x201400030001 ◽

2014 ◽

Vol 14 (3) ◽

pp. 3-18 ◽

Cited By ~ 45

Author(s):

Kei Sato ◽

Colombo Celso Gaeta Tassinari ◽

Miguel Angelo Stipp Basei ◽

Oswaldo Siga Júnior ◽

Artur Takashi Onoe ◽

...

Keyword(s):

High Resolution ◽

Analytical Method ◽

Sao Paulo ◽

São Paulo ◽

Ion Microprobe ◽

First Results ◽

The University

Download Full-text

SYNTHESIS OF TUBULAR Ge NANOSTRUCTURES

International Journal of Nanoscience ◽

10.1142/s0219581x10006533 ◽

2010 ◽

Vol 09 (01n02) ◽

pp. 75-81

Author(s):

L. Z. PEI ◽

H. S. ZHAO ◽

H. Y. YU ◽

J. L. HU

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

High Resolution ◽

Pore Size ◽

Formation Process ◽

Room Temperature ◽

Hydrothermal Process ◽

Rolling Mechanism ◽

Transmission Electron ◽

Inner Pore

Hollow germanium tubular nanostructures have been obtained by a hydrothermal process at a temperature of 400°C and pressure of 7 MPa with quick cooling to room temperature. Transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) show that the germanium tubular nanostructures are polycrystalline and have open-end structures at the tips. The diameter of germanium tubular nanostructures is about 40–70 nm and the inner pore size is about 10 nm in average. We propose the rolling mechanism for the formation of tubular nanostructures from lamellar nanostructures to explain the possible formation process of germanium tubular nanostructures.

Download Full-text

Small-Scale Structure of the Mon R2 Cloud Core

International Astronomical Union Colloquium ◽

10.1017/s0252921100019734 ◽

1994 ◽

Vol 140 ◽

pp. 266-267

Author(s):

TH. Henning ◽

R. Chini ◽

W. Pfau

Keyword(s):

Star Formation ◽

High Resolution ◽

Formation Process ◽

Molecular Clouds ◽

Scale Structure ◽

Small Scale ◽

Small Scale Structure ◽

Ir Sources ◽

Cloud Core

High-resolution mm continuum observations are especially well suited to detect clumpy structures in molecular clouds. In this paper we concentrate on the Mon R2 cloud core which is associated with a cluster of IR sources. Walker et al. (1990) made a 1.3 mm map with 30″ resolution. They found an unresolved and elongated structure extending from NE to SW. Here, we discuss high-resolution continuum maps at 870 and 1300 µm showing a rich clumpy structure on the scale of several 10 arcsec. The clumps are probably intimately linked to the star formation process in Mon R2.

Download Full-text