No abstract

The study examines the relationship between political behaviors, e.g., ingratiation, structure change, cooptation, and threat, and their outcomes such as interpersonal trust, alienation, and feeling about job performance. A negative relationship between political behaviors and interpersonal trust andfeelings about performance, and a positive relationship between political behaviors and alienation is hypothesized. Results largely support the hypotheses. However, a relationship between political behaviors and feelings about job performance is marginal. Findings are discussed in the light of available research.

In an attempt to identify novel magnetic refrigerant materials, we have studied the magnetic and magnetocaloric properties in RNi compounds with R = Gd, Ho and Er. GdNi is a simple ferromagnet with a collinear structure in contrast to HoNi and ErNi, in which the moments of rare earth sublattice are arranged non-collinearly. The magnetic ordering temperatures are observed to be 69 K, 36.5 K and 10 K for GdNi, HoNi and ErNi, respectively. The maximum values of magnetocaloric effect are found to be 17 J kg−1 K−1, 15 J kg−1 K−1 and 29 J kg−1 K−1 for Gd, Ho and Er, respectively, for an applied field of 50 kOe. The relative cooling power has been calculated to be 527 J kg−1 K−1, 780 J kg−1 K−1 and 510 J kg−1 K−1 for GdNi, HoNi and ErNi. These values compare well with those of many potential materials whose magnetic transitions are in the same range as in the present case.

We analyse the locking phenomena arising when an external-cavity diode laser is subjected to optical injection from another uncontrolled diode laser. The system stability is investigated as a function of coupled cavity time delay and the optical injection strength. Different regimes, spanning from ‘in-phase locking’ to ‘out-of-phase locking’ with ultimate amplitude death of low-frequency fluctuations/pulsations, are described experimentally as well as numerically for weak to moderate injection. Qualitative agreements between numerically and experimentally observed results for amplitude quenching are shown. Numerical studies describe the shifting of phase-flip bifurcation as the optical injection strength is varied for a particular time delay. Stable phase-locking behaviours, which are desired from the point of view of practical applications, are observed numerically in a wide range of control parameter space.

We report a detailed magnetic, magnetocaloric, and magnetotransport study on R 2 Ni 2 Sn compounds with different rare earths. The magnetic state of these compounds is found to be complex because of the coexistence of ferromagnetic and antiferromagnetic components. These compounds show phenomena such as multiple magnetic transitions, nonsaturation of magnetization, and metamagnetic transitions. Analysis of the zero-field heat capacity data shows that the magnetic entropy is less than the theoretical value, indicating the presence of some moment on Ni. Schottky anomaly is present in the magnetic heat capacity data of Sm 2 Ni 2 Sn. The temperature variation of magnetocaloric effect reflects the magnetization behavior. Tb 2 Ni 2 Sn and to a less extent Gd 2 Ni 2 Sn show oscillatory magnetocaloric effect. The variation of magnetocaloric effect is correlated with the ferromagnetic-antiferromagnetic phase coexistence. The electrical resistivity analysis has shown that the electron-magnon scattering is prominent at low temperature, while phonon scattering modified by the s-d interaction is crucial at high temperatures. The magnetoresistance is very large in Ce 2 Ni 2 Sn and shows a quadratic dependence on the field, implying the role of spin fluctuations in determining the transport behavior. Large magnetoresistance has been observed in other compounds as well.