New structures of the concurrent error detection systems for logic circuits

Proposed were new structures for concurrent error detection systems of the combinatorial logic circuits based on the codes with summation of the weighted transitions and their modifications. They were compared with the traditional systems of duplication and check by the Berger code. The structure based on the code with summation of the weighted transitions allowed one to improve the index of realization complexity as compared with the duplication system by 4 % on the average. The structure obtained by modifying the code with summation of the weighted transitions into the optimal code enables one to improve this index almost twice as much as compared with the system of checking by the Berger code. At that, this system has a better index of error detection. In certain cases, the structure of the concurrent error detection system on the basis of the optimal code is superior in complexity to the system of parity check.     

Two-Modulus Codes with Summation of On-Data Bits for Technical Diagnostics of Discrete Systems

A fundamentally new approach to building a code with summation of on-data bits based on the selection and separate check of subsets of bits of the data vector is presented. The properties of the proposed code are analyzed in comparison with the classic and modified Berger codes. The advantages and disadvantages of new codes with summation of on-data bits are noted. The basic properties of the proposed codes with summation that should be taken into account in solving problems of technical diagnostics are established. The results of experimental applications of the developed codes to the organization of concurrent error detection systems of combinational benchmarks from LGSynth`89 are given.     

Specific features of external heat and mass transfer in the vibration apparatuses used for regenerating spent fuel from nuclear power plants

We present experimental data on the coefficients of heat and mass transfer for freely floating bodies simulating fragments of cladding and large conglomerates of fuel, as well as on the local coefficients of heat and mass transfer over the bed height, which point to high intensity of heat and mass transfer processes that take place in the elements of vibration apparatuses intended for subjecting spent fuel from nuclear power plants to oxidative recrystallization.     

Influence of high-energy impact actions on the elastic and anelastic properties of martensitic Cu–Al–Ni crystals

The influence of high-energy impact shock-wave loading on the microplasticity and macroscopic performance of the Cu–Al–Ni crystals in the β₁′ martensitic phase has been studied. Elastic and anelastic properties of quenched and aged polyvariant single crystals before and after impact shock-wave loading were measured in the temperature range 80–300 K, at a frequency of about 100 kHz in the strain amplitude-independent and amplitude-dependent ranges by means of the composite oscillator technique, and in the MHz frequency range using the pulse–echo technique. High-velocity impact loading of the specimens was realised by plane shock-waves with stress pulses with a duration of 2·10⁻⁶ s and stress amplitudes up to 5 GPa. A pronounced influence of impact shock-wave loading on the elastic and anelastic properties of the β₁′ martensite has been observed. A strongly marked softening of the material and an enhancement of damping properties are revealed up to the highest stress pulse amplitudes. This behaviour differs fundamentally from the one observed in ‘ordinary’ fcc metals. Changes of the defect structure induced by shock-wave loading, which may be responsible for the observed phenomena, have been discussed.     

Computational and Theoretical Studies of Mass‐Spectrometric Measurements of the Comet Halley Dust Composition in Vega Experiments

Results of computational and theoretical studies are presented. A formulation of the problem is given and approaches to its solution are described. Brief information is given on the models, difference methods, and software designed or adapted to perform direct numerical modeling of massspectrometric measurements of cometary dust on PUMA instruments. The results of a number of computational experiments are presented.     

Checking of combinational circuits basing on modification sum codes

Organization of functional checking of combinational circuits based on application of modified sum codes is studied. These codes refer to classes of codes with weighted digits and weighted carriers. Properties of codes and techniques for realization of check-out equipment are defined.