نتایج جستجو برای: astronomical catalogues

تعداد نتایج: 10370  

2016
O. Takaoka C. Tindall T. Kobayashi Y. Hasegawa T. Sakurai

Using an STMJHREELS system, we have investigated the relationship between the surface morphology and vibrational modes of C60 adsorbed on Cu(l11). At 300K, CGO is mobile on the Cu(ll1) terrace, but is more strongly bound at the step edge. Therefore, any C60 which adsorbs on the terrace will migrate to the step edge where it is immobilized. Thus for very low coverages, the ChO preferentially ads...

2007
Manga Venkateswara Rao

For SOFCs to be main means of power generation, they should be able to exploit wide variety of fuels. Among Ni-cermets, Ni-YSZ is the state-of-the-art materials for the anode in SOFC which is the fuel electrode. But sulphur impurity present in different gaseous fuels (e.g Biogas), depending on its concentration, is highly poisonous to the stability and electrochemical performance of the Ni cata...

2000
Stephen R. Kane Kailash C. Sahu

The observed spectra of the microlensed sources towards the Galactic bulge may be used as a tool for studying the kinematics and extinction effects in the Galactic bulge. In this paper, we first investigate the expected distribution of the microlensed sources as a function of depth within the Galactic bulge. Our analysis takes a magnitude limited microlensing survey into account, and includes t...

2004
Kiri Wagstaff

Clustering algorithms can identify groups in large data sets, such as star catalogs and hyperspectral images. In general, clustering methods cannot analyze items that have missing data values. Common solutions either fill in the missing values (imputation) or ignore the missing data (marginalization). Imputed values are treated as just as reliable as the truly observed data, but they are only a...

2013
PAWEL BERCZYNSKI P. BERCZYNSKI

The method of complex geometrical optics (CGO) is presented, which describes Gaussian beam (GB) diffraction and self-focusing along a curvilinear trajectory in inhomogeneous and nonlinear saturable media. CGO method reduces the problem of Gaussian beam propagation in inhomogeneous and nonlinear media to solving ordinary differential equations for the complex curvature of the wave front and for ...

1995
Juan C. Migliore

In this paper, we are interested in giving an upper bound for the degrees of the generators for an ideal defining a curve in projective space, and in investigating the properties of curves for which this bound is realized. While our bound works for subschemes of any dimension in any projective space, our characterizations for when the bound is realized only work for curves in P. Using the known...

Journal: :SIAM J. Imaging Sciences 2016
S. J. Hamilton Juan Manuel Reyes Samuli Siltanen X. Zhang

The regularized D-bar method for electrical impedance tomography (EIT) provides a rigorous mathematical approach for solving the full nonlinear inverse problem directly, i.e., without iterations. It is based on a low-pass filtering in the (nonlinear) frequency domain. However, the resulting D-bar reconstructions are inherently smoothed, leading to a loss of edge distinction. In this paper, a no...

Journal: :Monthly Notices of the Royal Astronomical Society 2023

Cross-matching operation, which is to find corresponding data for the same celestial object or region from multiple catalogues,is indispensable astronomical analysis and research. Due large amount of catalogues generated by ongoing next-generation large-scale sky surveys, time complexity cross-matching increasing dramatically. Heterogeneous computing environments provide a theoretical possibili...

Journal: :Monthly Notices of the Royal Astronomical Society 2021

In the new era of very large telescopes, where data is crucial to expand scientific knowledge, we have witnessed many deep learning applications for automatic classification lightcurves. Recurrent neural networks (RNNs) are one models used these applications, and LSTM unit stands out being an excellent choice representation long time series. general, RNNs assume observations at discrete times, ...

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