Наведение малых астероидов на опасные околоземные объекты для предотвращения их столкновения с землей
In this paper, the method of changing the trajectories of hazardous asteroids with orbits known for
some years to be on a possible collision course with the Earth is considered. The method relies on the use of
small asteroids (asteroidprojectiles) directed at hazardous celestial bodies by giving the projectile a suffi
ciently small velocity impulse ensuring the Earth gravity assist. As a result, the asteroidprojectile vector can
be controllably changed over a wide range. Apophis is considered as an example of the target asteroid. The
technical feasibility of this method is discussed. It is noted that despite the potential use of this elegant
method, its practical implementation requires further research and development.
The dynamics of a two-component Davydov-Scott (DS) soliton with a small mismatch of the initial location or velocity of the high-frequency (HF) component was investigated within the framework of the Zakharov-type system of two coupled equations for the HF and low-frequency (LF) fields. In this system, the HF field is described by the linear Schrödinger equation with the potential generated by the LF component varying in time and space. The LF component in this system is described by the Korteweg-de Vries equation with a term of quadratic influence of the HF field on the LF field. The frequency of the DS soliton`s component oscillation was found analytically using the balance equation. The perturbed DS soliton was shown to be stable. The analytical results were confirmed by numerical simulations.
Radiation conditions are described for various space regions, radiation-induced effects in spacecraft materials and equipment components are considered and information on theoretical, computational, and experimental methods for studying radiation effects are presented. The peculiarities of radiation effects on nanostructures and some problems related to modeling and radiation testing of such structures are considered.
This volume presents new results in the study and optimization of information transmission models in telecommunication networks using different approaches, mainly based on theiries of queueing systems and queueing networks .
The paper provides a number of proposed draft operational guidelines for technology measurement and includes a number of tentative technology definitions to be used for statistical purposes, principles for identification and classification of potentially growing technology areas, suggestions on the survey strategies and indicators. These are the key components of an internationally harmonized framework for collecting and interpreting technology data that would need to be further developed through a broader consultation process. A summary of definitions of technology already available in OECD manuals and the stocktaking results are provided in the Annex section.