- Détails du magazine
- Format
- Magazine
- eISSN
- 1338-0532
- Première publication
- 03 Mar 2011
- Période de publication
- 2 fois par an
- Langues
- Anglais

#### Chercher

- Accès libre

The Verification of Influence of the Point „C“ Position from Given Interval to Solving Systems with Highspeed Feedback

Pages: 7 - 18

#### Résumé

This article deals with the design of effective numerical scheme for solving three point boundary value problems for second-order nonlinear singularly perturbed differential equations with initial conditions. Especially, it is focused on the analysis of the solutions when the point c from given interval is not the centre of this interval. The obtained system of nonlinear algebraic equations is solved by Newthon-Raphson method in MATLAB. It also verifies the convergence of approximate solutions of an original problem to the solution of reduced problem. We discuss the solution of a given problem with the situation when the point c is in the middle of the given interval.

#### Mots clés

- nonlinear dynamic systems
- MATLAB
- high-speed feedback
- numerical scheme

- Accès libre

Improving Cognitive Skills of the Industrial Robot

Pages: 19 - 28

#### Résumé

At present, there are plenty of industrial robots that are programmed to do the same repetitive task all the time. Industrial robots doing such kind of job are not able to understand whether the action is correct, effective or good. Object detection, manipulation and grasping is challenging due to the hand and object modeling uncertainties, unknown contact type and object stiffness properties. In this paper, the proposal of an intelligent humanoid hand object detection and grasping model is presented assuming that the object properties are known. The control is simulated in the Matlab Simulink/ SimMechanics, Neural Network Toolbox and Computer Vision System Toolbox.

#### Mots clés

- industrial robot
- cognitive skills
- object detection
- pose estimation

- Accès libre

Evaluation of Safety Parameters According to IEC Standards

Pages: 29 - 36

#### Résumé

The article deals with different procedures for determining the safety integrity level and its applications. The purpose of this research was to evaluate the system and associate it with certain safety integrity level. In this article, we will use IEC 61508, IEC 61511 and IEC 62061 for comparison. The first standard is specified as the superior standard for all safety-critical systems. The second one acts as an extension of the superior standard in the field of functional safety. The last one is aimed at machinery safety.

#### Mots clés

- safety system
- evaluation of safety
- risk analysis
- IEC 61508

- Accès libre

Remote Dosimetry Monitoring Unit for Human Unfriendly Environment

Pages: 37 - 44

#### Résumé

This article deals with the design of a mobile monitoring vehicle which is intended to measure radioactivity in the human unfriendly environmental conditions. The prototype of such unmanned ground vehicle (UGV) was successfully built and tested in our controlled environment.

#### Mots clés

- mobile unit
- construction
- environment
- radioactivity

- Accès libre

Kinetics of Electrons from Plasma Discharge in a Latent Track Region Induced by Swift Heavy ION Irradiation

Pages: 45 - 52

#### Résumé

While passing swift heavy ion through a material structure, it produces a region of radiation affected material which is known as a "latent track". Scattering motions of electrons interacting with a swift heavy ion are dominant in the latent track region. These phenomena include the electron impurity and phonon scattering processes modified by the interaction with the ion projectile as well as the Coulomb scattering between two electrons.

In this paper, we provide detailed derivation of a 3D Boltzmann scattering equation for the description of the relative scattering motion of such electrons. Phase-space distribution function for this non-equilibrioum system of scattering electrons can be found by the solution of mentioned equation.

#### Mots clés

- swift heavy ions
- electronic scattering
- latent track
- Boltzmann equation
- phonon scattering
- electron scattering-in/out rate

- Accès libre

On the Relativistic Correction of Particles Trajectory in Tandem Type Electrostatic Accelerator

Pages: 53 - 60

#### Résumé

A constant potential is applied to the acceleration of the ion-beam in the tandem type electrostatic accelerator. However, not just one voltage is applied, but instead a number of applications can be made in succession by means of the tandem arrangement of high voltage tubes. This number of voltage applications, which is the number of so-called "stages" of a tandem accelerator, may be two, three, or four, depending on the chosen design. Electrostatic field with approximately constant intensity acts on ions in any stage.

In general, non-relativistic dynamics is used for the description of the ion transport in tandem accelerator. Energies of accelerated ions are too low and relativistic effects cannot be commonly observed by standard experimental technique. Estimation of possible relativistic correction of ion trajectories is therefore only a matter of calculation. In this note, we briefly present such calculation. Our aim is to show how using the relativistic dynamics modifies the particles trajectory in tandem type accelerator and what parameters determine this modification.

#### Mots clés

- ion beam
- relativistic correction
- tandem type electrostatic accelerator
- ion trajectory
- relativistic dynamics

- Accès libre

Charged Particle Dynamics Inside Electrostatic Quadrupole Deflection System with Circular Electrodes and Rotationally Symmetric Design

Pages: 61 - 70

#### Résumé

This paper offers a theoretical study of special type of electrostatic quadrupole deflection system (EQDS) intended for ion beam optics. We deal with EQDS consisting of electrode pairs with rotational symmetry design. This systems was pre-designed for an ion beam modification and trajectory controlling. Basic assumptions for determination of transfer characteristics of such systems are analysed on the basic of charged particle dynamics.

We are especially interested in the electrostatic field distribution among electrodes inside the mentioned type of EQDS. Typical case of the Sturm-Liouville boundary value problem called Bessel`s differential equation arises in calculation of the electrostatic scalar potential with rotational symmetry. Bessel`s functions are particular solution of Laplace equation in this case. The scalar potential equations of motion for ions in this electrostatic field are found. The path of charge-particles in this field could be determined by solving the trajectory equation of motion in Cartesian coordinates.

#### Mots clés

- ion beam
- quadrupole
- Laplace equation
- Bessel`s differential equation
- Bessel`s functions

- Accès libre

Quantization of Energy in 1D Model of Crystal Lattice with Local Perturbations Induced by Ion-Beam Impact

Pages: 71 - 78

#### Résumé

In this paper, we propose theoretical basis for investigation of dynamics of acoustic phonons in a thin layers containing nano-scale structural inhomogeneities. One-dimensional (1D) model of a crystal lattice was considered to reveal specific features of the processes arising in such system of phonons in equilibrium state. Standard quantization of energy of 1D ionic chain vibrating by acoustic frequencies was carried out while the presence of foreign ions in this chain was taken into account. Since only two dimensions are dominant in thin layers, only longitudinal vibrations of the chain in the plane of the layer were considered. Results showed that foreign ions affect the energy quantization. Phonon-phonon interaction between two phonon`s modes can be expected if the mass of foreign ions implanted by ion-beam differs from the mass of ions in the initial layer.

We believe that the obtained results will help to understand the character of phonon systems in nanostructured thin layers prepared by ion-bem technology, and will allow better explain some thermal and electrical phenomena associated with lattice dynamics in such layers.

#### Mots clés

- acoustic phonon
- quantization
- thin layer
- 1D ionic chain
- phonon modes
- structural inhomogeneities

#### Résumé

The article deals with testing and choosing right virtualization platform with management tools for building private cloud, in which methods for power control of virtual machines can be applied. Main brick in every virtualization platform is hypervisor which carries out virtualization and management tools which deliver the services such as web management, storage management and resources management from one place.

#### Mots clés

- hypervisor
- private cloud
- virtualization