Abstract Hawking predicted that the formation of a black hole by gravitational collapse causes quantum particle creation and spectrum particles is almost thermal. This phenomenon called radiation. Recently, it has been may drastically change from radiation to strong double burst if suddenly stops just before event horizon. In contrast with radiation, be so can observational interest even for co...

RF spectrum is a scarce resource. It is inefficient when no of users are increased. So cognitive radio is developed for provide to efficient use of bandwidth utilization. Licensed users are primary users and unlicensed users are secondary users. Cognitive radio enables the secondary usage of unused licensed spectrum band. In this Paper, we propose spectrum decision framework for best effort app...

The answer may be yes. A discrete model of energy-conserved wavefunction collapse is proposed. It is shown that the model is consistent with existing experiments and our macroscopic experience.

In order to meet the constantly increasing demand by mobile terminals for higher data rates with limited wireless spectrum resource, cognitive radio and spectrum aggregation technologies have attracted much attention due to its capacity in improving spectrum efficiency. Combing cognitive relay and spectrum aggregation technologies, in this paper, we propose a dynamic spectrum aggregation strate...

Future detection of a supernova neutrino burst by large underground detectors would give important information for the explosion mechanism of collapse-driven supernovae. We studied the statistical analysis for the future detection of a nearby supernova by using a numerical supernova model and realistic Monte-Carlo simulations of detection by the Super-Kamiokande detector. We mainly discuss the ...

In spectrum-sharing systems where the secondary user (SU) opportunistically accesses the primary user (PU)’s licensed channel, the SU should satisfy both the transmit power constraint of the SU transmitter and the received power constraint at the PU receiver. This letter studies the ergodic capacity of spectrum-sharing systems in fading channels. The ergodic capacity expression along with the o...

Abstract In an earlier paper, we obtained exact solutions of the Wheeler–DeWitt equation for the Lemâıtre–Tolman–Bondi (LTB) model of gravitational collapse, employing a lattice regularization. In this paper, we derive Hawking radiation in non-marginally bound models from our exact solutions. We show that a non-vanishing energy function does not spoil the (approximate) Planck spectrum near the ...

The isothermal gravitational collapse and fragmentation of a molecular cloud region and the subsequent formation of a protostellar cluster is investigated numerically. The clump mass spectrum which forms during the fragmentation phase can be well approximated by a power law distribution dN/dM ∝ M. In contrast, the mass spectrum of protostellar cores that form in the centers of Jeans unstable cl...

Many strucrural engineers are surprised to learn that the In~rnotional Building Code (IBC, 2009) requires the roof structure to be engineered for standing water weight in the vicinity of the drains and scuppers regardless of roof slope. In addition, some low-slope roofs also require special attenlion for water weight and stiffness for safety against ponding failures or protection against accele...