We report the experimental discovery of a temperature-dependent change in the nature of glass fracture under low-energy (<10 keV) electron bombardment. This is shown to depend on the transition from the thermal-shock to the thermalfluctuation mechanism of fracture at the limiting temperature T1 = (Tg − 150) °C. The high-temperature cleavage fracture of K8 and TF1 glasses was studied and the threshold value of the critical power initiating cleavage fracture was determined (for the glasses studied Θthr = 50–70 W·sec·cm−2).

Comparative tests of the electroerosion resistance and rate of removal of tungsten-copper composites in different structural conditions were made on a standard production Model 4720 electroerosion profile broaching machine equipped with an ShGI-16-880B wide-range pulse generator. The relatively low resistance of the El'konait composition in machining VK20 sintered carbide may be explained by the strong nonuniformity of its structure and the presence in it of coarse (on the order of 30 μm) grains of tungsten. Composites characterized by high dispersion of the constituent components and a significant degree of uniformity of their distribution possess the highest erosion resistance. The relative wear of these alloys is the lowest (10–15%) of all of those known until now.

It is proved that a minimal generating system of the lattice of all subspaces of a finite-dimensional vector space over a finite field of q elements contains at most max(q+3) elements. This bound does not depend on the dimension of the space.

It has been established that densification in the hot pressing of tungsten and its pseudoalloys is accomplished through several processes, each of which predominates in a particular density range. At a relative density of 0.45-0.6, regrouping and dense packing of particles play the main part. In the density range 0.6–0.8, the process is controlled chiefly by plastic deformation in the particle contact zones. At higher densities, diffusional creep becomes the dominant factor.

An installation has been designed and constructed for the hot pressing of large-sized parts from refractory metals and compounds. The pressing load is 1000 tons and the operating temperature is 2500°C. The installation can be employed for pressing parts up to 500–700 mm in size.

The proposed method can be used to obtain a uniform scale for practically any functional relationshipα=f (x) and also when it is necessary to expand the scale at the extreme sections of the scale. Changing the character of the scale by this method requires almost no changes in the construction of the measuring mechanism. Using the method of deforming the character of the scale and selecting the dial profile, it is possible to obtain a uniform scale with Kn≈1.3. This greatly simplifies the production of instrument scales.

There is no reason why the reaction of tungsten with graphite die sets should prevent parts from tungsten and its pseudoalloys from being produced by the hot pressing technique. In pressing with isothermal holding for 60 min and a heating-up time of 1 h (such periods are quite adequate in the manufacture of large-sized components), the thickness of the resulting carbide layer is ∼ 1 mm for tungsten and ∼0.6 mm for the pseudoalloys.