Although the IPTS-68 is meant to be a close approximation to thermodynamic temperatures, its definition makes no provision for continuity in dt/dt68 at 630.74 " C . Any discontinuity in dt/dt68 at 630.74 " C is directly related to the corresponding discontinuity in the first derivative with respect to t6g of sensor output, so the former can be obtained from measurement of the latter. The magnitude of the discontinuity has not previously been measured precisely: it has an important bearing on elucidating the behaviour of ( t -i 6 g ) near 630.74"C. Over the temperature range from about 610 "C to 645 "C two calibrated platinum resistance thermometers, nine platinum -1Ooh rhodium/platinum thermocouples, and two other types of thermocouples have been intercompared in an experimental arrangement designed expressly to measure the discontinuity. The result for the relative discontinuity in dt/dt6g at 630.74 "C was found to be 0.51 k 0.10 percent.
Eine empfindliche Methode zum Nachweis von acylierenden Agentien beruht auf der Lumineszenz, die bei der Umsetzung mit Isonitrosoacetanthranilsäure (I) entsteht.
Magnetic hysteresis properties of nanostructured industrially manufactured Nd-Fe-B and Pr-Fe-B alloys on the base of a tetragonal Nd2Fe14B (2-14-1) hard magnetic phase (MQP-B, MQP-B+ and MQP-16-7 brands) have been investigated at 4.2 K in magnetic fields up to 58 T. The chemical composition of the alloys given in the certificates was defined more precisely. The grain sizes of the main 2-14-1 phase were determined. The average grain size is much smaller than a critical single domain diameter. Coercivity, remanence magnetization, saturation magnetization and maximal magnetic energy product were determined at 4.2 K and compared with those obtained at room temperature.
An exact solution is employed to investigate the thermodynamics of the degenerate Anderson model, describing the rare earth magnetic alloys.
IntroductionRecently Schlottmann (1983) and Ogiewetskii et a1 (1983) used the exact solution of the degenerate Anderson model (Schlottmann 1982) to investigate the zero-temperature properties of the rare-earth magnetic alloys of Ce and Yb. In the present paper we consider the finite-temperature behaviour of this model. The degenerate Anderson model is usually used for a description of dilute alloys of Ce and Yb. The Hamiltonian is J Here C& and c k j are the creation and annihilation operators, respectively, of band electrons in a state characterised by the absolute value of momentum k , the total angular momentumJ (we suppress this index) and its projectionj. The&, interchange the states with atomic shells 1 q ) and Ip): Xp, I I) = 6,llp) ( p = 0 if the impurity shell is empty, p = j if it is occupied by one electron with the jth projection of total angular momentum, the other, higher energy states are neglected). qis the one-electron atomic energy (measured
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