A new elastic scheduling task model in the node of a control and measurement system

The paper presents a new elastic scheduling task model which has been used in the uniprocessor node of a control measuring system. This model allows the selection of a new set of periods for the occurrence of tasks executed in the node of a system in the case when it is necessary to perform additional aperiodic tasks or there is a need to change the time parameters of existing tasks. Selection of periods is performed by heuristic algorithms. This paper presents the results of the experimental use of an elastic scheduling model with a GRASP heuristic algorithm

A New Elastic Scheduling Task Model in the Node of a Control and Measurement System

The paper presents a new elastic scheduling task model which has been used in the uniprocessor node of a control measuring system. This model allows the selection of a new set of periods for the occurrence of tasks executed in the node of a system in the case when it is necessary to perform additional aperiodic tasks or there is a need to change the time parameters of existing tasks. Selection of periods is performed by heuristic algorithms. This paper presents the results of the experimental use of an elastic scheduling model with a GRASP heuristic algorithm

Spin-Wave Resonance in Magnetic Semiconductor Thin Films - Experiment

Magnetic properties of polycrystalline thin films of chromium chalcogenide spinels (CdCr$\text{}_{2}$Se$\text{}_{4}$ lightly doped with indium and CdCr$\text{}_{2x}$In$\text{}_{2-2x}$Se$\text{}_{4}$) were studied. The ferromagnetic (FMR) and spin-wave resonance (SWR) techniques were used to investigate the temperature dependences of both the spin-wave stiffness constant D and the saturation magnetization M$\text{}_{s}$. The resonance spectra were recorded in the temperature range extending from 4.2 K to 300 K. The influence of indium concentration on M$\text{}_{s}$(T) and D(T) was studied. It was shown that lightly doped samples (In/Cd < 1% at.) exhibited the ferromagnetic ordering with M$\text{}_{s}$(T) and D(T) being the linear functions of T$\text{}^{3}$ $\text{}^{/}$ $\text{}^{2}$ and T$\text{}^{5}$ $\text{}^{/}$ $\text{}^{2}$, respectively. Higher concentration of indium produced the reentrant transition and spin-glass state of magnetic ordering in CdCr$\text{}_{2x}$In$\text{}_{2-2x}$Se$\text{}_{4}$. The temperature dependence of M$\text{}_{s}$ was also found from the FMR data for these two magnetic phases

H-T Phase Diagram of Magnetic Semiconductor Thin Films - Experiment

We used the irreversibilities between the field cooled and zero field cooled dc magnetization to determine the field and composition dependence of the spin-glass freezing temperature in CdCr$\text{}_{2}$Se$\text{}_{4}$ : In (REE) and CdCr$\text{}_{2-2x}$In$\text{}_{2x}$Se$\text{}_{4}$ (0.15 ≤ x ≤ 0.35) (SG) thin films. The H-T phase diagram of samples with REE has two instability lines: the Gabay-Toulouse-type (G-T) and the De Almeida-Thouless-type (A-T) while samples in SG state are characterized by the A-T line. The A-T line of thin films was used for calculation the normalised internal magnetic field h$\text{}_{m}$ of infinite spin clusters with long range ordering

STUDIES OF MAGNETIC PROPERTIES OF THIN CdCr2Se4 FILMS - EXPERIMENT

A new preparation method of thin CdCr2Se4 : In films by vacuum evaporation technique is proposed. We report and analyse the temperature dependence of magnetization and the effect of Cr2+ and Cr+4 impurity ions on the FMR linewidth. Also the electrical transport properties of these films are studied

Prototype Silicon Position-Sensitive Detector Working with Bragg-Brentano Powder Diffractometer

A prototype 64-channel detector module, comprising a silicon strip detector with strip pitch of 100μm and 64-channel ASIC RX64, was tested with the X-Pert Philips MPD diffractometer. Basic parameters of the detector module, energy resolution, and detection efficiency, were evaluated as a function of the counting rate. Energy resolution of 1.1 keV FWHM for photon rate up to 1×10$\text{}^{7}$ photon/s per 1 cm of the active width of the detector was demonstrated. The prototype detector, when applied in a diffractometer utilizing Bragg-Brentano focusing principle, allows to increase the counting rate by about 2 orders of magnitude with respect to a single counter. Exemplary diffraction patterns of polycrystalline samples of Si and SiO$\text{}_{2}$ (quartz peak cluster) are presented

Temperature Dependence of Magnetisation Reversal and GMR in Spin Valve Structures

Temperature measurements of magnetisation reversal, resistance and magnetoresistance of Co/Cu/Co/FeMn spin valve structures deposited in different conditions were performed. The influence of exchange anisotropy energy, interlayer coupling energy, and electron transport properties were taken into consideration in explaining differences in giant magnetoresistance effect of investigated samples