scholarly journals Perturbative benchmark models for a dark shower search program

2021 ◽  
Vol 103 (11) ◽  
Author(s):  
Simon Knapen ◽  
Jessie Shelton ◽  
Dong Xu
Keyword(s):  
Search Program

A Search for β Cephei Stars in the Southern Hemisphere - Results

1979 ◽  
Vol 46 ◽  
pp. 474-503 ◽  
Author(s):  
M. Jerzykiewicz ◽  
C. Sterken
Keyword(s):  
Southern Hemisphere ◽  
B Stars ◽  
Search Program

In 1975 we started a photometric search program of examining for variability- the bright early B stars located south of -20° declination. The main purpose we had in mind was to look for hitherto undiscovered 6 Cephei variables. Therefore, we limited our program to objects spectroscopically similar to the B Cephei stars.

scholarly journals An Update on The Problem of Small Comets

1998 ◽  
Vol 11 (1) ◽  
pp. 237-238
Author(s):  
J.C. Brandt ◽  
M.F. A’Hearn
Keyword(s):  
Recent Work ◽  
Terrestrial Planets ◽  
Indirect Methods ◽  
Earth’S Atmosphere ◽  
Direct Observations ◽  
Icy Bodies ◽  
Earth's Atmosphere ◽  
Search Program ◽  
Volatile Materials

The evidence for a major population of small comets (SCs) is summarized in two steps. First, we briefly summarize our previous work. Second, we describe recent work that continues to find SCs. When new capabilities become available that can detect SCs, we expect to find them and this is occurring. At present, their detection is a haphazard process and we advocate a dedicated, optimized search program. We define SCs as those icy bodies (i.e., sublimating bodies) with radius less than 1000 meters. Often the existence of SCs is inferred from effects ascribed to them. These “effects” include: lunar cratering; cratering on Ganymede; excess interplanetary hydrogen; delivery of volatile materials to the terrestrial planets; and a source of fragile bodies entering the Earth’s atmosphere. While some of these indirect methods support the existence of SCs, direct observations are clearly preferred.

Genetic Algorithm for Searching for Critical Slip Surface in Gravity Dams Based on Stress Fields

2013 ◽  
Vol 790 ◽  
pp. 146-149
Author(s):  
Jian Yun Chen ◽  
Shu Wang ◽  
Qiang Xu ◽  
Jing Li
Keyword(s):  
Genetic Algorithm ◽  
Slip Surface ◽  
Safety Evaluation ◽  
Fem Analysis ◽  
Stress Fields ◽  
Gravity Dam ◽  
Critical Slip Surface ◽  
Gravity Dams ◽  
Sliding Stability ◽  
Search Program

Currently, the safety evaluation of gravity dam concentrates on stress and anti-sliding stability of the dam. A lot of research shows that the upper area of the dam is one of the whole dams weakest areas during an earthquake and should be studied in details. In this study, the genetic algorithm and non-linear FEM analysis are combined, then a search program is written to search the critical slip surface in the dams upper area. Finally, the surface which has the least anti-sliding stability coefficient is obtained, the most dangerous slip surface and its anti-sliding coefficient as well as the corresponding time are acquired to evaluate the safety of the dam.

scholarly journals The planet search program at the ESO Coudé Echelle spectrometer

2002 ◽  
Vol 392 (2) ◽  
pp. 671-690 ◽  
Author(s):  
M. Endl ◽  
M. Kürster ◽  
S. Els ◽  
A. P. Hatzes ◽  
W. D. Cochran ◽  
...  
Keyword(s):  
Search Program ◽  
Echelle Spectrometer

scholarly journals The APUS Supernova Search Program: A Scientific Leadership and Research Opportunity for Graduate and Undergraduate Students

2021 ◽  
Vol 2 (2) ◽  
Author(s):  
Kristen A. Miller ◽  
Christopher Colvin ◽  
Melanie Crowson ◽  
Jason Cushard ◽  
Terry Trevino
Keyword(s):  
Undergraduate Students ◽  
Research Opportunity ◽  
Search Program

Abundance ratios & ages of stellar populations in HARPS-GTO sample

2017 ◽  
Vol 12 (S330) ◽  
pp. 156-159 ◽  
Author(s):  
E. Delgado Mena ◽  
M. Tsantaki ◽  
V. Zh. Adibekyan ◽  
S. G. Sousa ◽  
N. C. Santos ◽  
...  
Keyword(s):  
Chemical Evolution ◽  
Thin Disk ◽  
Thick Disk ◽  
Heavy Elements ◽  
Galactic Chemical Evolution ◽  
Chemical Abundances ◽  
Homogeneous Sample ◽  
Different Populations ◽  
Search Program ◽  
Cu And Zn

AbstractIn this work we present chemical abundances of heavy elements (Z>28) for a homogeneous sample of 1059 stars from HARPS planet search program. We also derive ages using parallaxes from Hipparcos and Gaia DR1 to compare the results. We study the [X/Fe] ratios for different populations and compare them with models of Galactic chemical evolution. We find that thick disk stars are chemically disjunt for Zn adn Eu. Moreover, the high-alpha metal-rich population presents an interesting behaviour, with clear overabundances of Cu and Zn and lower abundances of Y and Ba with respect to thin disk stars. Several abundance ratios present a significant correlation with age for chemically separated thin disk stars (regardless of their metallicity) but thick disk stars do not present that behaviour. Moreover, at supersolar metallicities the trends with age tend to be weaker for several elements.

scholarly journals PROGRAMMING PEARL: Enhancing a search algorithm to perform intelligent backtracking

2004 ◽  
Vol 4 (3) ◽  
pp. 371-380 ◽  
Author(s):  
MAURICE BRUYNOOGHE
Keyword(s):  
Search Algorithm ◽  
Search Space ◽  
Prolog Program ◽  
Dead End ◽  
Intelligent Backtracking ◽  
Search Program ◽  
Simple Search

This paper illustrates how a Prolog program, using chronological backtracking to find a solution in some search space, can be enhanced to perform intelligent backtracking. The enhancement crucially relies on the impurity of Prolog that allows a program to store information when a dead end is reached. To illustrate the technique, a simple search program is enhanced.

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