This study was designed to examine the effects of low-energy laser irradiation on osteocytes and bone resorption at bony implant sites. Five male baboons with a mean age of 6.5 years were used in the study. Four holes for accommodating implants were drilled in each iliac crest. Sites on the left side were irradiated with a 100 mW low-energy laser (690 nm) for 1 min (6 Joule) immediately after d...

Static analysis of concurrent languages is a complex task due to the non-deterministicexecution of processes. If the concurrent language being studied allows process synchro-nization, then the analyses are even more complex (and thus expensive), e.g., due to thephenomenon of deadlock. In this work we introduce a static analysis technique based onprogram slicing for concurrent an...

For parallel systems constituted by communicating sequential processes executing on multiprocessor hardware with distributed memory, a Petri net based hierarchically de-composable integrated model, the PRM-net model has been developed. PRM-nets (Program Resource Mapping-nets) provide a modular concept for modelling parallel programs or algorithms with a Petri net like graphical formalism called...

The extreme hypothesis that essentially all types of ultrarelativistic outflow – specifically AGN jets, pulsar wind nebulae and GRB –are electromagnetic, rather than gas dynamical, phenomena is considered. Electromagnetic flows are naturally anisotropic and self-collimating so as to produce jet-like features. The relativistic force-free description of these flows, which is simpler than the rela...

Modern computer systems use concurrent and distributed processing, which is very diierent from the sequential processing of earlier systems. Concurrency and synchro-nisation in such systems have multiplied the diiculties associated with analysing their correctness and performance. Generalised Stochastic Petri nets (GSPNs) allow for a natural expression of con-currency and support both types of ...

With the increased penetration of Distributed Generators (DGs) in the contemporary Power System, having knowledge of rapid Real-Time electro-mechanical Dynamic States has become crucial to ensure the safety and reliability of the grid. In the conventional SCADA based Dynamic State Estimation (DSE) speed was limited by the slow sampling rates (2-4 Hz) so State Estimation was limited to static st...

A heuristic approach to the application of bandwidth-oriented signal timing is proposed based on a system partition technique. The proposed approach divides a large signalized arterial into subsystems with three to five signals in each subsystem. Each subsystem is optimized to achieve the maximum bandwidth efficiency. A one-directional system progression bandwidth, normally in the peak-flow dir...

Relativistic electron-positron winds with strong magnetic fields are considered as a source of radiation for cosmological γ-ray bursters. Such a wind is generated by a millisecond pulsar with a very strong magnetic field. An electronpositron plasma near the pulsar is optically thick and in quasi-thermodynamic equilibrium. It is shown that the main part of radiation from the pulsar wind is nonth...

Using only the reciprocity postulate, it is demonstrated that the spatial separation of two objects, at rest in some inertial frame, is invariant. This result holds in both Galilean and special relativity. A corollary is that there are no 'length contraction' or associated 'relativity of simultaneity' effects in the latter theory. A thought experiment employing four unsynchronised clocks and a ...

Abstract The development and implementation of the River Information Services (RIS) concept started in end 1990s with various research projects followed by national or regional first decade this century. resulting RIS systems haven’t been able to exploit full potential when it comes cross-border data exchange interoperability. To overcome these gaps Corridor Management was established aiming at...