Mining Event Temporal Boundaries from News Corpora through Evolution Phase Discovery

2011 ◽  
pp. 554-565 ◽  
Author(s):  
Liang Kong ◽  
Rui Yan ◽  
Han Jiang ◽  
Yan Zhang ◽  
Yan Gao ◽  
...  
Keyword(s):  
Evolution Phase

scholarly journals UV-Observations of Young Populous Clusters in the Large Magellanic Cloud

1984 ◽  
Vol 108 ◽  
pp. 55-56
Author(s):  
Edward H. Geyer ◽  
Angelo Cassatella
Keyword(s):  
Globular Clusters ◽  
Main Sequence ◽  
Large Magellanic Cloud ◽  
Time Interval ◽  
Sequence Evolution ◽  
Stellar Clusters ◽  
T Tauri ◽  
Red Supergiants ◽  
Evolution Phase ◽  
Massive Clusters

The young populous star clusters give evidence for the ‘explosive’ star formation in the Magellanic Clouds which took place in the time interval 5·106 yrs to < 108 yrs agoe. They are also key objects for the understanding of the formation of massive stellar clusters, because they are still situated close to their ‘birthplace’ in the parent galaxy and are dynamically not relaxed (Geyer et al. 1979). Their HRD-morphology shows most of the member stars in the upper Main Sequence range with only a few massive yellow and red supergiants. The lower massive stars are still in the pre-main-sequence evolution phase (‘T-Tauri state’), which cannot be observed at the MC's distances. Thus in the uv-spectral range the blue stars with (B-V) < 0.1 on the upper MS contribute to the uv-fluxes. In the optical spectral regions the bright ‘blue’ globular clusters seem not be embedded in remanent interstellar matter, though neighbouring loose stellar aggregates of similar age are in many cases surrounded by dense HII-regions. This rises the questions wether the starformation process in such massive clusters was so efficient that no remanent matter was left over, or was this material blown away by the uv-radiation of the numerous OB-member stars?

Microstructural evolution, phase formation and mechanical properties of multi-component AlCoCrFeNix alloys

2019 ◽  
Vol 125 (10) ◽  
Author(s):  
Leigang Cao ◽  
Xiaohe Wang ◽  
Yiming Wang ◽  
Leilei Zhang ◽  
Yue Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Phase Formation ◽  
Microstructural Evolution ◽  
Evolution Phase

Texture evolution, phase transformation and mechanical properties of selective laser melted Ti-13Nb-13Zr

2018 ◽  
Vol 145 ◽  
pp. 185-195 ◽  
Author(s):  
Libo Zhou ◽  
Tiechui Yuan ◽  
Jianzhong Tang ◽  
Lanbo Li ◽  
Fangsheng Mei ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Phase Transformation ◽  
Texture Evolution ◽  
Evolution Phase

Accumulation Models of the Natural Gas in the Foreland Basins of China and their Physical Simulation Experiment

2011 ◽  
Vol 233-235 ◽  
pp. 2812-2815
Author(s):  
Hong Zhang
Keyword(s):  
Oil And Gas ◽  
Physical Simulation ◽  
Phase 1 ◽  
Foreland Basin ◽  
Thrust Belt ◽  
Foreland Basins ◽  
Simulation Experiments ◽  
Phase 3 ◽  
Evolution Phase ◽  
The Common

The paper chooses foreland basin as its research object. after summarizing the accumulation characteristics of the different phases and different parts of them, the common models of the whole foreland basin are given and the physical simulation experiments are carried out. It shows that the foreland basins experience three phases of evolution. Phase 1 is the period that the source rock and structure oil and gas traps form. Phase 2 is the period that multi-cycle reservoir and lithologic oil and gas pool form. phase 3 is the period that foreland uplift belt and fault anticline pool form. Then a foreland basins has three different belts including of thrust belt, foredeep and foreland slope belt, foreland uplift belt, and the belts have different accumulation models. With regard to the hydrocarbon accumulation period of the foreland basin, the thrust belt have precedence to other belt. foredeep and foreland slope belt forms the secondary pools. Foreland uplift belt accumulates hydrocarbon very quickly.

scholarly journals Forces and Flow Structures on a Simplified Car Model Exposed to an Unsteady Harmonic Crosswind

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Valérie Ferrand
Keyword(s):  
Phase Shift ◽  
Transient Flow ◽  
Measurement Techniques ◽  
Flow Topology ◽  
Average Force ◽  
Ground Vehicle ◽  
Vortical Structures ◽  
Car Model ◽  
Image Velocimetry ◽  
Evolution Phase

A ground vehicle traveling along a road is subject to unsteady crosswinds in a number of situations. In windy conditions, for example, the natural atmospheric wind can exhibit strong lateral gusts. Other situations, such as tunnel exits or overtaking induce sudden changes in crosswinds, as well. The interaction of this unsteady oncoming flow with the vehicle and the resulting aerodynamic forces and moments affect the vehicle stability and comfort. The objectives of the current study are to improve the understanding of flow physics of such transient flow and ultimately to develop measurement techniques to quantify the vehicle’s sensitivity to unsteady crosswind. A square back simplified car model is exposed to a forced oscillating yaw and results are compared to static measurements. Tests are conducted at Reynolds number Re = 3.7 × 105 and reduced frequencies ranging from 0.265 × 10−2 to 5.3 × 10−2. Unsteady side force and yawing moment measurements are associated with particle image velocimetry flow fields to interpret dynamic loads in link with flow topology evolution. Phase average force and moment measurements are found to exhibit a phase shift between static and dynamic tests that increases with oscillating frequency. Velocity fields reveal that the phase-shift seems to originate from the rear part of the car model. Moreover, lateral vortical structures appearing on the lee side from β = 15 deg increase this phase-shift and consequently appear to be favorable to the lateral stability of the vehicle.

A hypothetical end of creative-expansive evolution phase of the expansive non-decelerative universe

1992 ◽  
Vol 191 (2) ◽  
pp. 333-339 ◽  
Author(s):  
Vladim�r Skalsk� ◽  
Miroslav S�ken�k
Keyword(s):  
Evolution Phase
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