Development of equipment for heat treatment of carbon fibres

Conclusions 1. Adequate experience and knowledge has been accumulated in the Khimtekstil'mash NPO to make it possible to develop equipment for the manufacture of CF which conform to the contemporary world level. In recent years work on developing new equipment and improving existing equipment for the manufacture of CF have not received new development because of the lack of financing. One must also note the decrease in tempo of work on technological assurance, which is reflected in the technical level of equipment being developed.2. In connection with the high cost of work on developing new technologies and equipment for the manufacture of CF, these problems require solution at the state and in first-state level, since CF are materials not only for the present but also mainly for the future.Deceased.Khimtekstil'mash NPO (Chernigov). Translated from Khimicheskie Volokna, No. 5, pp. 33–35, September–October, 1993.     

Unfired dolomite refractories with increased hydration resistance

Conclusions The use of dolomite burnt in grain form for the manufacture of unfired goods with a tar bond makes it possible to obtain refractories with a high hydration resistance and with high physicomechanicai properties. Coal tar with a 65–70% pitch content should be used as a bonding agent.Sintered grain dolomite should be added to the batch without being ground, preferably in combination with finely ground metallurgical magnesite or magnesite-dolomite clinker.     

Introduction of a method of rammed linings of 230-ton steel teeming ladles

Refractories and Industrial Ceramics -     

The aligned Si nanowires growth using MW plasma enhanced CVD

New and simple modification of vapor-liquid-solid process for Si nanowires growth based on microwave plasma enhanced chemical vapor deposition that uses solid-state Si target as a source of Si atoms was developed. The method was temperature and pressure controlled evaporation of solid phase of Si source in hydrogen microwave plasma. Aligned growth of Si nanowires was performed in local electric field by applying of constant negative bias to substrate holder. Deposited Si nanowires were studied by scanning electron microscopy (SEM), Raman and photoluminescence spectroscopy. Correlation between photoluminescence spectra and Si nanowires properties were studied.     

Layer-by-layer composition and structure of silicon subjected to combined gallium and nitrogen ion implantation for the ion synthesis of gallium nitride

The composition and structure of silicon surface layers subjected to combined gallium and nitrogen ion implantation with subsequent annealing have been studied by the X-ray photoelectron spectroscopy, Rutherford backscattering, electron spin resonance, Raman spectroscopy, and transmission electron microscopy techniques. A slight redistribution of the implanted atoms before annealing and their substantial migration towards the surface during annealing depending on the sequence of implantations are observed. It is found that about 2% of atoms of the implanted layer are replaced with gallium bonded to nitrogen; however, it is impossible to detect the gallium-nitride phase. At the same time, gallium-enriched inclusions containing ～25 at % of gallium are detected as candidates for the further synthesis of gallium-nitride inclusions.     

Prediction of the Aggressive Status of Prostate Cancer on the Basis of Preoperative Data

The problem concerning the prediction of the aggressive status of prostate cancer (PCa) is examined on the basis of preoperative data. This problem is solved using data on 360 patients with the established (aggressive or indolent) postoperative status of the disease. The collection of factors containing five informative indicators of prediction (from primarily accessible sixteen) is revealed and employed to create the diagnostic index used to predict the aggressive PCa status. In compliance with cross-validation data, the prognostic algorithm enables us to find the group involving 55% of patients with an aggressive status in the absence of patients with an indolent PCa status. The three-class prediction algorithm making it possible to ascertain whether any patient belongs to the group with the low, high, or uncertain risk of the aggressive disease stage is proposed.     

Gibbs random fields on a lattice: Definitions,existence, uniqueness,and phase transitions (a review of proceedings of the seminar on statistical physics at the faculty of mechanics and mathematics of the Moscow state university in 1962–1994)

The Moscow Grand Seminar on Statistical Physics is one of the first seminars in the world devoted to rigorous methods in statistical physics. The achievements of the seminar can be appreciated in full measure from publications by the leaders of the seminar (R.L. Dobrushin, V.A. Malyshev, R.A. Minlos, Ya.G. Sinai). This paper presents a review (far from complete) of the proceedings of the seminar. The emphasis is made on the fundamental definitions and most important results.     

Investigation of the IC resistance to pulsed electromagnetic radiation

The results of the experimental investigation of the resistance of digital ICs to electromagnetic radiation, whose parameters are varied in a rather large range (at the wavelength λ= 4 cm, RF pulse duration τ = 0.1−1000 μs and pulse-repetition frequency F = 0.1−10000 Hz), are presented. The damage to the ICs caused by the radiations is analyzed. The experiment conditions are compared to the actual irradiation conditions for the ICs mounted on an electronic-equipment printed circuit board.     

Commensurate-incommensurate magnetic phase transition induced in TbNi<Subscript>5</Subscript> by an external magnetic field

Neutron-diffraction studies of a single crystal of TbNi₅ have been performed. Temperature and field dependences of the intensities of the Bragg reflection (001) and magnetic satellites (001)⁻ and (001)⁺ have been determined. In the temperature range of 7–10 K, sharp changes in the intensities of both the Bragg reflection and its satellites have been revealed. A conclusion is made that these changes are due to the existence of a magnetic transition from an incommensurate into a lock-in structure. It has been found that at 11 K an external magnetic field μ₀ H = 0.1 T oriented along the [100] axis induces the same magnetic state of the crystal as its cooling to 7 K in the absence of a field. In an external magnetic field μ₀ H = 0.4 T, there occurs a magnetic transition from the incommensurate phase with a wave vector k = 2π/c (0, 0, 0.18) into a commensurate ferromagnetic phase with k = 0. In the ferromagnetic phase, an increase in the field from 0.4 to 0.6 T is accompanied by an increase in the intensity of the ferromagnetic reflection (001) by a factor of 1.6. This indicates the existence of strong fluctuations of the magnetization at 0.4 T.