[en] New studies of light water thermal conductivity in the temperature range -14,8 deg C to 210 deg C and pressures up to 2010 bar were made at the Thermal and Physical Laboratory of Grozny Oil Institute. This investigation was carried out in order to extend the range of the International Skeleton Table thermal conductivity to 1000 bar, to define more accurately the thermal conductivity equation taken at the compilation of the International Skeleton Table 1964 and other data previously obtained

[en] Like in Germany, this new code features a safety factor of 1.5 vis-a-vis minimum yield point and makes high demands on the tensile strength of the material. Its prospective designation will be ASME Sec. VIII Div. 3. The paper briefly deals with design-relevant aspects. The safety philosophy of the code is very similar to the one found in the specifications of the AD sheet. (DG)

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[en] The lattice parameters of an anthracene crystal were measured as functions of hydrostatic pressure in the pressure range from 0--5.4 kbar using neutron diffraction techniques. The results were found to agree with previous measurements of the volume compressibility of anthracene and, in the a and b directions, with the values extrapolated from linear compressibility data for linear polyphenyls. The values of the linear compressibilities were used to derive an improved set of elastic constants from currently available velocity of sound data

[en] The dependence of the n-H₂ molar volume on pressure at the temperature of liquid nitrogen is measured by the piston displacement technique in the pressure range from 4 to 29 kbar. The data are presented in an analytical form which approximates the results of the experiment with an accuracy to 0.03 cm³/mole. The relative volume change on melting is (4.7 +- 0.4)%

[en] A single-crystal study on AlPO₄ was performed at 2.90 (7) GPa with synchrotron radiation using a diamond-anvil cell with a beryllium gasket. For the data collection the radiation wavelength of only 0.54 A was chosen to minimize the absorption of X-rays in the pressure cell. The diffracted intensity was high enough to measure even weak reflections with sufficient counting statistic. The refined structural parameters are in good agreement with those determined from data collected with a conventinal X-ray tube. (orig.)

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[en] The solid state properties of the actinides are controlled by the dualism of the localized and itinerant (delocalized) configuration of the 5f electrons. This dualism allows to define two main subgroups. At ambient pressures the first subgroup, of elements with atomic number 91 to 94, is characterized by 5f electrons in an itinerant state and the second subgroup, atomic number 95 to 98, by 5f electrons in a localized state. The latter means that these electrons have well defined energy levels and do not contribute to the metallic bond. The other two subgroups consist of thorium, as a subgroup of its own because its 5f levels are practically unoccupied in the ground state configuration, and of the five heaviest elements with atomic number 99 to 103. The most remarkable effect of pressure on the actinide metals is that due to closer contact between the lattice atoms, localized 5f electrons can become itinerant, hybridise with the conduction electrons and participate in the metallic bond. In this chapter the high-pressure structural behaviour of actinide metals is reviewed. Section 3 gives an introduction into the techniques of generating and measuring pressure and of determining various physical properties of the actinides under pressure and describes a few high-pressure devices and methods. Sections 4 to 7 treat the high-pressure results for each subgroup separately. In section 8 the results of the preceding sections are brought together in a graphical representation which consists of interconnecting binary phase diagrams of neighbouring actinide metals. 155 refs.; 14 figs.; 7 tabs. (H.W.)