On the Short Time Scale Evolutionary History of Contact Binary VW Cephei

We study the short-time evolutionary history of the well-known contact binary VW Cep. Our analysis is based partly on the numerous UBV lightcurves obtained at Tartu Observatory, IUE spectra, and samples from the published data. Special attention is given to the effects of asymmetry of the light curves. A higher degree of asymmetry outside the eclipses along with the significant displacements of the brightness maxima in respect to the elongation phase is interpreted as evidence that a considerable portion of the flaring source is concentrated close to the neck connecting the components. We discuss the nature of asymmetry in terms of possible mass exchange and the flare activity and compare the results of our model computations with the record of orbital period variations over the last 60 years.

Download Full-text

AI and HCI: Two Fields Divided by a Common Focus

AI Magazine ◽

10.1609/aimag.v30i4.2271 ◽

2009 ◽

Vol 30 (4) ◽

pp. 48 ◽

Cited By ~ 24

Author(s):

Jonathan Grudin

Keyword(s):

Time Scale ◽

Short Time Scale ◽

Intelligent Behavior ◽

History Of ◽

Short Time ◽

Competition For Resources

Although AI and HCI explore computing and intelligent behavior and the fields have seen some cross-over, until recently there was not very much. This article outlines a history of the fields that identifies some of the forces that kept the fields at arm’s length. AI was generally marked by a very ambitious, long-term vision requiring expensive systems, although the term was rarely envisioned as being as long as it proved to be, whereas HCI focused more on innovation and improvement of widely-used hardware within a short time-scale. These differences led to different priorities, methods, and assessment approaches. A consequence was competition for resources, with HCI flourishing in AI winters and moving more slowly when AI was in favor. The situation today is much more promising, in part because of platform convergence: AI can be exploited on widely-used systems.

Download Full-text

Short Time Scale Variation of a Near-Contact Binary System, GR Tauri

Stellar Astrophysics - Astrophysics and Space Science Library ◽

10.1007/978-94-010-0878-5_25 ◽

2000 ◽

pp. 211-220 ◽

Cited By ~ 1

Author(s):

B. Soonthornthum ◽

Y. Yang ◽

L. Qingyao ◽

B. Tanvanichkul

Keyword(s):

Binary System ◽

Time Scale ◽

Short Time Scale ◽

Contact Binary ◽

Short Time ◽

Scale Variation

Download Full-text

Faculty Opinions recommendation of On the simulation of protein folding by short time scale molecular dynamics and distributed computing.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.1005159.177184 ◽

2002 ◽

Author(s):

Tamar Schlick

Keyword(s):

Molecular Dynamics ◽

Protein Folding ◽

Distributed Computing ◽

Time Scale ◽

Short Time Scale ◽

Short Time

Download Full-text

An Alternative Test Using Algal Cultures for Testing Chemicals for Toxicity

Alternatives to Laboratory Animals ◽

10.1177/026119299302100213 ◽

1993 ◽

Vol 21 (2) ◽

pp. 196-201

Author(s):

Søren Achim Nielsen ◽

Thomas Hougaard

Keyword(s):

Size Distribution ◽

Mitotic Activity ◽

Time Scale ◽

Test System ◽

Short Time Scale ◽

Toxic Substances ◽

Alternative Test ◽

Short Time ◽

Algal Cultures ◽

Test Cultures

An alternative test is presented, in which algal cultures are used for testing toxic substances. This test system is based on variations in the size distribution of cells in test cultures as a measurement of growth. Thus, inhibition of mitotic activity is used as a measurement for toxic effects. The test can be performed on a short time-scale and is very sensitive to even weak toxic doses.

Download Full-text