نتایج جستجو برای: ism structure

تعداد نتایج: 1573583  

2011
Jimmy S. J. Ren Wei Wang Zhimin Hua Kaiquan Xu Stephen Shaoyi Liao

Many information systems development companies are facing the question on how to apply agile methods in information systems maintenance (ISM). Performing correction of software defects in ISM inevitably degenerates program structure. On the other hand, agile methods provide refactoring to improve program structure without changing its behavior. This paper builds an optimal control model to bala...

2004
Luis Salas Irene Cruz-González

We present the radial velocity structure of the molecular hydrogen outflows associated to the star forming region Cepheus A. This structure is derived from the doppler shift of the H2 v=1–0 S(1) emission line obtained by Fabry–Pérot spectroscopy. The East and West regions of emission, called Cep A (E) and Cep A (W), show radial velocities in the range of -20 to 0 km s with respect to the molecu...

2000
Naohito Nakasato Toshikazu Shigeyama

The long-term evolution of supernova remnants (SNRs) in the primordial interstellar medium (ISM) with an inhomogeneous structure is calculated to investigate metal enrichment of the primordial gas. For this purpose, we have constructed a parallel 3-D hydrodynamics code incorporating the radiative cooling and self-gravity. The self-gravity and radiative cooling develop the inhomogeneous structur...

1990
T. Beckert

Intraday Variability of compact extragalactic radio sources can be interpreted as quenched scintillation due to turbulent density fluctuations of the nearby ionized interstellar medium. We demonstrate that the statistical analysis of IDV time series contains both information about sub-structure of the source on the scale of several 10 μas and about the turbulent state of the ISM. The source str...

2008
Andrew Kusiak

The product life-cycle management has been considered from different perspectives, including the Design (or Dependency) Structure Matrix (DSM) approach. In this paper, a matrix decomposition approach is presented as an alternative to the DSM approach. The decomposition approach calls for another representation of the input data (a matrix) referred to in the literature as the Interface Structure...

2006
M. Haverkorn

We present an analysis of the rotation measures (RMs) of polarized extragalactic point sources in the Southern Galactic Plane Survey. This work demonstrates that the statistics of fluctuations in RM differ for the spiral arms and the interarm regions. Structure functions of RM are flat in the spiral arms, while they increase in the interarms. This indicates that there are no correlated RM fluct...

2004
X. H. Sun

We study structure functions of rotation measures in the Canadian Galactic Plane Survey (CGPS) region and the North Galactic Pole (NGP) to extract the interstellar medium (ISM) fluctuation information. The CGPS data are divided into three longitude intervals: 82 < l < 96 (CGPS1), 115 < l < 130 (CGPS2) and 130 < l < 146 (CGPS3). The structure functions of all three regions have large uncertainti...

Journal: :Proceedings of the International Astronomical Union 2006

2005
Hans-Reinhard Müller Priscilla C. Frisch Gary P. Zank

At present, the heliosphere is embedded in a warm low density interstellar cloud that belongs to a cloud system flowing through the local standard of rest with a velocity near ∼18 km s. The velocity structure of the nearest interstellar material (ISM), combined with theoretical models of the local interstellar cloud (LIC), suggest that the Sun passes through cloudlets on timescales of ≤ 10–10 y...

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