Using the Very Large Array (VLA) and Other Radio Telescopes to Perform a Parasitic Search for Extraterrestrial Intellige...
Published in Acta Astronautica
Radio Frequency Interference at Jodrell Bank within the Protected 21 cm Band.” Paper #IAA-86-425 presented at the 15th I...
Published in Acta Astronautica
Summary of Interference Measurements at Selected Radio Observatories.” Paper #IAA-90-580 presented at the 41st Congress ...
Published in Acta Astronautica
Toxicological implications of extended space flights.
Published in Acta astronautica
The dominant reason for exposing humans to the risks of space flight is their ability to perform complex tasks and make complex decisions. To fulfill such a role, crews must be shielded against even incipient degradation of performance capacity. The space environment contains potential hazards ranging from microgravity to infectious microorganisms ...
Artificial equilibrium points for a generalized sail in the elliptic restricted three-body problem
Published in Celestial Mechanics and Dynamical Astronomy
Different types of propulsion systems with continuous and purely radial thrust, whose modulus depends on the distance from a massive body, may be conveniently described within a single mathematical model by means of the concept of generalized sail. This paper discusses the existence and stability of artificial equilibrium points maintained by a gen...
Relativistic rocket: Dream and reality
Published in Acta Astronautica
•Concepts of photon rocket and proton–antiproton annihilation rocket are revised.•Cross-section of annihilation is accounted for to calculate annihilation length.•Relativistic matter propulsion is substantiated and discussed.•Map-velocity and map-distance are calculated for various values of efflux power.•The problem of heat disposal is accentuated...
Simulation of regional-scale groundwater flow in the Azul River basin, Buenos Aires Province, Argentina
Published in Hydrogeology Journal
A three-dimensional modular model (MODFLOW) was used to simulate groundwater flow in the Azul River basin, Buenos Aires Province, Argentina, in order to assess the correctness of the conceptual model of the hydrogeological system. Simulated heads satisfactorily match observed heads in the regional water-table aquifer. Model results indicate that: (...
Auroral E-region electron density gradients measured with EISCAT
Published in Annales Geophysicae
In the theory of E-region plasma instabilities, the ambient electric field and electron density gradient are both included in the same dispersion relation as the key parameters that provide the energy for the generation and growth of electrostatic plasma waves. While there exist numerous measurements of ionospheric electric fields, there are very f...
Structural and control optimization of a space structure subjected to the gravity-gradient torque
Published in Acta Astronautica
Abstract This paper focuses on the integrated structural/control optimization of a large space structure (LSS) with a robot arm and tip payloads subjected to the gravity-gradient torque. Constraints from the structure and control disciplines are imposed on the integrated optimization process with the aim of obtaining the structure's minimum weight ...
Fusion of IMU and Vision for Absolute Scale Estimation in Monocular SLAM
Published in Journal of Intelligent & Robotic Systems
The fusion of inertial and visual data is widely used to improve an object’s pose estimation. However, this type of fusion is rarely used to estimate further unknowns in the visual framework. In this paper we present and compare two different approaches to estimate the unknown scale parameter in a monocular SLAM framework. Directly linked to the sc...
