IR-Untersuchungen an Polyurethan-Harnstoff-Block-Elastomeren

Ohne Zusammenfassung     

Production of direct single electrons in proton-nucleus collisions at 13 GeV/c

Direct production of single electrons in proton-nucleus collisions at 13 GeV/c has been measured. A rising $\text{e}\text{π}$ ratio with decreasing p_T above the 10^?4 level is observed for low p_T single electrons. The source of the rising $\text{e}\text{π}$ ratio at low $\text{e}\text{π}$ ratio at low p_T is discussed in connection with the low mass dielectron continuum below the ? mass region.     

Magnetothermal resistivity of antiferromagnetic insulator

Magnetothermal resistivity of an antiferromagnetic insulator is calculated by assuming that the thermal energy is carried mainly by phonons which are scattered by spin fluctuations. The spin system is treated by the Green function method.     

Preparation and properties of NH4Ti2P3O12 in the pseudobinary system NH4H2PO4TiO2

Phase equilibria in the system NH₄H₂PO₄TiO₂ were studied and a new compound (NH₄Ti₂P₃O₁₂) with Nasicon-type structure was synthesized. Its stability range was established. X-Ray and thermal properties were investigated and another new compound (Ti₄P₆O₂₃) with the Nasicon-type structure was obtained by heat treatment at 770°C.     

A new synthesis of olefins. Conversion of nitroolefins into olefins by reductive elimination

A nitro group in nitroolefins is displaced by hydrogen giving the corresponding olefins in good yields by the reaction of nitroolefins with sodium sulfide in the presence of benzenethiol. It proceeds rapidly at room temperature.     

Rapid electrochemical determination of dissolved sulphur in liquid copper by solid-sulphide electrolytes

The application of solid-sulphide electrolyte sulphur sensing cells to measure directly dissolved sulphur in molten copper has been investigated using an immersion probe with the Cas-2wt% ZrS₂ solid solution electrolyte and the Mo+Mo₂S₃ two-phase mixture reference electrode. The emf measurements were carried out at 1473 K for the liquid copper with sulphur concentrations from 0.43 to 2.20 at %. Steady potentials were attained within ≈10 min after dipping the probe. The equilibrium partial pressures of sulphur in molten copper calculated from the observed emfs were in agreement with those from the H₂-H₂S gas equilibrium investigations.     

The diatomic lattice from a viewpoint of a diagrammatic method

By a diagrammatic method, a diatomic lattice is investigated as an exactly soluble model and its Helmholtz free energy is derived in closed form.     

Electromagnetic properties of baryons in the quark model

We use the non-relativistic harmonic oscillator quark model to study electromagnetic properties of baryons. We show that the wave function radius can be determined very precisely (within 2 ～ 3% error) studying the electromagnetic mass difference. The obtained value (R² = 2.75 GeV^?2) is much smaller than that which is widely believed (6 GeV^? ? R² ? 16 GeV^?2).We use this value to study photo- and electro-production processes. It is shown that if this small R² is used and if the amplitude is calculated in the frame where the non-relativistic approximation is the best, the predicted results for these processes (including the helicity structures of D₁₃ and F₁₅) agree with the experimental data remarkably well.