Heat-conducting adhesives based on modified epoxy resins

Main characteristics of heat-conducting adhesive materials used to withdraw heat from warming elements of devices and the joints of electrotechnical equipment are presented. The developed materials, i.e., TsMK-TP adhesive pastes and TPK convenient for application adhesives, are cold-curing compositions based on epoxy-diane resins modified with Laproxide products. They have heat conductivity coefficients of no less than 1.8 W/(m K), are workable in the temperature range of −196 to 150°C (up to 200°C for a short period of time), and do not contaminate optical elements due to minimal gas release under exposure to vacuum and increased temperatures.     

Formation of conductive layers inside diamond by hydrogen ion implantation and subsequent thermal treatment at low or high pressures

(111) synthetic HPTP diamond plates are irradiated by H ₂ ⁺ 50 keV ions in the range of the fluences of 1?13 × 10¹⁶ sm^?2 and annealed in vacuum at 1 mPa (VPHT, 500?C1600°C) or at high HPHT parameters (4.0?C7.5 GPa, 1200?C1550°C). It is shown by measuring the layer conductivity and Raman light scattering that after VPHT annealing, a buried layer of glassy carbon 10?C100 nm thick with low resistance (??1 kOhm/??) is formed, followed by HPHT with high resistance (??1 MOhm/??) and hopping transport along defects.     

Correlation between biological activity and energies of electronic transitions in benzodiazepines. Negative ion mass spectrometry and ultraviolet absorption spectroscopy study of some derivatives

A correlation between the energies of electronic singlet transitions in benzodiazepines and their biological activity, which was revealed earlier by means of negative ion mass spectrometry with resonance electron capture, has been verified with a UV absorption spectroscopy investigation. Also, it has been noted that the energies of electronic singlet transitions in benzodiazepines are close in value to the ionization energies of atoms Cs, Rb, K, Na, Li and Tl, the cations of which are known to play an important role in nerve cell excitation processes. Copyright 1999 John Wiley & Sons, Ltd.     

Modeling electric field amplification in the plasma resonance region

Translated from Pryamye i Obratnye Zadachi Matematicheskoi Fiziki, pp. 222–225, 1991.     

The effect of absorbed hydrogen on the magnetic properties of DyFe11Ti

The effect of absorbed hydrogen on the structural and magnetic properties of DyFe₁₁Ti has been investigated. The compound DyFe₁₁Ti was hydrogenated to the composition DyFe₁₁TiH_x, where x ranges from 0 to 1.5. The absorption hydrogen pressure-composition isotherms of the hydrides indicate solid solution behavior. Hydrogen absorption does not change the tetragonal structure of the host compound but is accompanied by an expansion in unit cell volume. Magnetic characteristics of the host material and its hydrides (measured in situ in a hydrogen atmosphere) were investigated over the temperature range 77–700 K and at applied fields up to 12 kOe. Upon hydrogenation the magnetic ordering temperature T_c as well as the spin-reorientation temperatures T_sr are observed to increase. Moreover, the incorporation of hydrogen leads to an expansion of the temperature range in which the magnetic anisotropy of the rare-earth sublattice dominates over that of the iron sublattice.     

Cylindrical shells and plates

International Applied Mechanics -     

Effect of intramolecular interactions on the complexing capacity of p-XC6H4OR Ethers

Conclusions The complexing capacity in p-XC₆H₄OR ethers relative to tetracyanoethylene as a -acceptor is determined by the reverse and direct polar conjugation between the X and OR substituents.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 49–52, January, 1986.