Inconsistent conclusions are obtained from recent active galactic nuclei (AGNs) accretion disk inter-band time-lag measurements. While some works show that the measured time lags significantly larger (by a factor of $\sim 3$) than theoretical predictions Shakura \& Sunyaev (SSD) model, others find measurements consistent with (or only slightly than) SSD model. These conflicting observational re...

In this paper we propose new insights based on an insertion heuristic and generalized resource constraint propagation for solving the job shop scheduling problem with minimum and maximum time-lags. To show the contribution of our propositions we propose a branch-and-bound algorithm and provide an experimental study. The results obtained conclude that our heuristic obtains feasible schedules wit...

Ecosystems across the United States are changing in complex ways that difficult to predict. Coordinated long-term research and analysis required assess how these changes will affect a diverse array of ecosystem services. This paper is part series product synthesis effort U.S. National Science Foundation’s Long Term Ecological Research (LTER) network. revealed each LTER site had at least one com...

Estimating an accurate velocity model is crucial for seismic imaging to obtain a good understanding of the subsurface structure. The objective of this thesis is to investigate methods of velocity analysis by optimizing seismic images. A conventional seismic image is obtained by zero-lag crosscorrelation of wavefields extrapolated from a source wavelet and recorded data on the surface using a ve...

Context. The black hole at the Galactic Center, Sgr A*, is the prototype of a galactic nucleus at a very low level of activity. Its radio through submm-wave emission is known to come from a region close to the event horizon, however, the source of the emission is still under debate. A successful theory explaining the emission is based on a relativistic jet model scaled down from powerful quasar...

Context. The black hole at the Galactic Center, Sgr A*, is the prototype of a galactic nucleus at a very low level of activity. Its radio through submm-wave emission is known to come from a region close to the event horizon, however, the source of the emission is still under debate. A successful theory explaining the emission is based on a relativistic jet model scaled down from powerful quasar...