Magnetic properties of hydrides of the intermetallic compound Nd2Fe14BHx are investigated in the temperature range covering the Curie temperatures (T-C) of the compounds (up to 670 K). The temperature dependencies of magnetization are measured under continuous control of hydrogen content in the investigated samples. The dependencies of Curie and spin-reorientation transition (T-SR) temperatures on the hydrogen concentration are studied in detail. The dependence of hydrogen concentration on pressure at a constant temperature (near T-C) and on the temperature at various pressures are obtained. We attempted to estimate the contributions of the unit cell volume increase upon hydrogenation and the electronic structure change in the variation of T-C of the hydrogenated Nd2Fe14B. (C) 2018 Elsevier B.V. All rights reserved.

The compound Tm 2 Fe 17 , the only one among R 2 Fe 17 (where R is a rare earth metal), exhibits uniaxial magnetic anisotropy at cryogenic temperatures. Its Curie temperature is close to room temperature, T C = 295 K. Magnetic phase diagrams for the Tm 2 Fe 17 –H system have been constructed on the basis of measuring the temperature and field dependences of magnetization performed for different crystallographic directions of single-crystalline samples of Tm 2 Fe 17 and its hydrides Tm 2 Fe 17 H x ( x = 1, 2, 3, 4). It has been found that the hydrogen atoms, located in the interstices of the crystal lattice of this compound, have a significant effect on both its Curie temperature and the type of magnetic anisotropy.

Magnetic properties of the hydrides of an intermetallic compound Ho2Fe14B are studied in the temperature range 78 700 K. The temperature dependencies of magnetization σ (Т) are obtained under continuous control of the hydrogen content in the samples investigated. The dependence of the Curie (TC) and the spin-reorientation transition (TSR) temperatures on hydrogen pressure (P) and its concentration (x) are determined. The dependence of hydrogen concentration on pressure at constant temperatures (isotherms x (P)) in the vicinity of TC and the temperature variation of hydrogen concentration at a constant pressure (isobars x (T)) are investigated.

Magnetic properties of the hydrides of an intermetallic compound Ho2Fe14B are studied in the temperature range 78 - 700 K. The temperature dependencies of magnetization sigma(T) are obtained under continuous control of the hydrogen content in the samples investigated. The dependence of the Curie (T-C) and the spin-reorientation transition (T-SR) temperatures on hydrogen pressure (P) and its concentration (x) are determined. The dependence of hydrogen concentration on pressure at constant temperatures (isotherms x(P)) in the vicinity of T-C and the temperature variation of hydrogen concentration at a constant pressure (isobars x(T)) are investigated.

Human movement has bcen the object of observation from prehistoric times, Evidence for that interest is illustrated by the number of monuments rock paintings and objects in places like Central Sahara, Egypt, Syria, Latin America, Ancient Hellas and Rome, Information about that can be found in the works of many scientists, cspecially in the report of E. Asmunsen. The author draws the bounds of this first stage of knowledge of motor activity from the invention of photography, realized by Meybridge, lRR7. The application of photography, chrono-photography and subsequen­ tly of the stroboscopic effect allows to objectify the research, and on that ground to reveal number of regularities in the kinematics of movement. A reliable knowledge of the nature of movements, i.e. of their dynamic structure was obtained at the end of the nineteenth century, with the experiments of Maray, 1886, who applied for the first time a method for direct registration of movcment during walking and running. This fact marks a new stage in the knowledge of movement, a transition from analysis of the visible form of the movements to the knowledge of its hidden nature. This view stage is also characterized by numerous attempts of physiologists, kinesiologists, anatomists and biomechanists, to reveal the processes and the phenomena occuring in the locomotory system, allowing the realization of movement. Independently of the fact that at the cnd of thc sixteenth century Galvany made his first experiments with muscles. according to Asmunsen. the first systematic investigation in vivo was done by Duchenne (1885). That was the beginning of the application of electromyography (EMG).

Magnetic properties of intermetallic compound Gd2Fe14B and its hydrides Gd2Fe14BHx have been investigated. Measurements of the temperature dependencies of magnetization have been performed with the permanent control of the hydrogen content in the investigated samples. The dependencies of Curie (TC) and spin-reorientation transition (TSR) temperatures on the hydrogen pressure and concentration of the inserted hydrogen atoms in the crystal lattice have been determined. On the base of experimental data for TC the exchange parameters and their change after hydrogenation have been calculated.

Magnetic properties of intermetallic compound Er2Fe14B and its hydrides Er2Fe14BHx have been investigated. Measurements of the temperature dependencies of magnetization have been performed with the permanent control of the hydrogen content in the investigated samples. The dependencies of Curie (TC) and spinreorientation transition (TSR) temperatures on the hydrogen pressure and concentration of the inserted hydrogen atoms in the crystal lattice have been determined. Reasoning from the experimental data for TSR, TC and exchange parameters, the crystal field parameters and their change with the concentration of the inserted hydrogen atoms have been calculated.

The hydrogenation effect on some structural and magnetic properties of the intermetallic compound HoFe11Ti was investigated. The absorbed hydrogen causes the appearance of a spin reorientation transition. The temperature of this transition, as well as the magnetic ordering temperature were determined as a function of the hydrogen concentration. The temperature dependencies of the magnetic moment of 8i, 8j, 8f iron and Ho atoms and the unit cell parameters were determined using neutron diffraction methods.

Powder neutron diffraction measurements have been performed on the HoFe11TiDx (x=0, 0.7, 0.9) compounds. The results show the appearance of a spin–reorientation transition and a remarkable change of the crystallographic parameters and the magnetic moments of the Fe atoms after deuteration.

A number of X-ray diffraction techniques were applied for the investigation of possible changes of structure during the annealing acid cooling of the martensitic stainless steel, MANET-1, that had been previously stabilised by tempering. Measurements were made at ambient temperature on specimens annealed at one of a number of temperatures up to 1000 degrees C. Cooling of the samples was carried out at two different speeds: by quenching in cold water from the annealing temperature and by slow cooling to room temperature in the furnace. The main observed parameters were: phase composition, texture, and line broadening. Qualitative X-ray diffraction analysis performed on the initial and annealed specimens showed there was no new phases present after annealing. However, the more detailed investigation of the line broadening, combined with measurements of Vickers microhardness and texture gave some information about the nature of the processes occurring during annealing and cooling and their influence on the stability of the material at high temperatures. In the temperature range investigated, the material undergoes a phase transformation from martensitic to austenitic state during annealing and vice versa. The transformation temperature in the investigated steel lies within the interval 840-900 degrees C.

The effect of absorbed hydrogen on the structural and magnetic properties of DyFe11Ti has been investigated. The compound DyFe11Ti was hydrogenated to the composition DyFe11TiHx, 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 Tc as well as the spin-reorientation temperatures Tsr 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.

The magnetic properties of the intermetallic compounds TbFe11TiHx (0 ≦ x ≦ 0.65) are investigated over the temperature range from 78 to 700 K and in applied magnetic fields up to 1000 kA/m. Upon hydrogenation the magnetic ordering temperature TC is observed to increase. 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, which results in an increase of the spin-reorientation temperature TSR. [Russian Text Ignored]

Pressure dependence of magnetization isotherms for amorphous Tb40Co60 alloy was measured up to 10 kbr. The temperature variations of the specific magnetization σ as a function of hydrostatic pressure (▵σ-effect) and the volume magnetostriction ω were estimated. The pressure effect on the integral of d-d change interaction and coercive force was studied.

Magnetic properties of amorphous TbxCo100-x alloys with an induced in-plane uniaxial anisotropy were studied. Complex reorientation transitions, not observed earlier in amorphous materials, were found. These transitions were most vivid in Tb21Co79 amorphous alloy, in which at low temperatures the resulting moments of Tb and Co sublattices practically compensate one another.