Characteristics of Quantum Magnetosonic-Wave Dispersion

Using the quantum magnetohydrodynamics (QMHD) model, linear dispersion of magnetosonic waves are studied in a quasineutral quantum electron-ion plasma in two distinct regimes of nonrelativistic and relativistic degeneracies considering also the plasma composition effect. It is shown that the paramagnetic spin effects of the degenerated electrons plays a key role in dynamics of magnetosonic waves. The linear wave-speed is found to have minimum value at some degeneracy parameter in such plasmas. This is due to delicate interplay between relativistic degeneracy and the Pauli spin-magnetization. It is also revealed that the plasma composition has significant effect on the linear dispersion in the relativistic degeneracy limit contrary to that of nonrelativistic case and Zeeman energy has significant effect in nonrelativistic degeneracy regime unlike that of relativistic one in the linear perturbation-limit. Current findings can have important applications in both inertial plasma confinement and astrophysical degenerate plasmas.Comment: To appear in IEEE Trans. Plasma Sci. arXiv admin note: text overlap with arXiv:1106.022

Labour market performance of immigrants in smaller regions of western countries: some evidence from Atlantic Canada

Despite recent interest in regionalization of immigration in host nations, most studies have analyzed immigrants’ economic performance by largely focusing on their overall national performance. A regional analysis is necessary because changing geographic distribution of immigrants can affect their economic performance positively or negatively. Present paper focuses on Atlantic Canada whose share in annual Canadian immigrant inflows has been traditionally low, but where recent policy initiatives have resulted in greater attraction and retention of immigrants. Immigrants are found performing better than non-immigrants in regional labour market. The importance of regional analysis of immigrants’ economic performance and contribution in host nations is highlighted