[Book review] "Crisis and Response in the Malaysian Economy edited by Jomo K. S., Khong How Ling, and Shamsulbahriah Ku Ahmad"

Malaysia, Economic policy, International economic relations

Population Density Measurements in a Supersonic Freejet Expansion Flow of an O₂-seeded Ar Plasma

The population densities of O(3p³P) and O(3p⁵P) were measured along the freejet centerline of an O₂-seeded Ar plasma, which was such that oxygen gas was seeded into a pre-ionized argon plasma. The ratio of the measured population densities of the 3p³P and 3p⁵P states was compared with the predicted ratio, which was determined from a steady state population assumption of O(3p⁵P), over the whole region of the freejet. The comparison showed that on the condition Nₑ=1.8×10¹³-1.7×10¹²cm⁻³ Tₑ= 3000-900 K and p＝48-0.19 Pa, the 3p⁵P state is populated by electron-collisional de-excitations of the 3p³P state, rather than by quenching of the 3p³P state by the ground state argon. Further, the 3p⁵P state is de-populated by electron-collisional de-excitations rather than by radiative de-excitations

Soft Magnetic Co-Ti-B Amorphous Alloys with High Corrosion Resistance

Co-Ti-B ternary amorphous ribbons were prepared by the melt-quenching method, and their soft magnetic properties, hardness and corrosion resistance have been investigated. With increasing titanium content, the Curie temperature decreases monotonically, while the crystallization temperature gradually increases. These alloys are magnetically very soft, that is, the coercive force takes a minimum value of 0.01 Oe and the maximum permeability shows a large value of 6×10^4 around x=0.05 for (Co_Ti_x)_B_ amorphous alloys. Their linear magnetostrictions are also quite small, being of the order of about -2.5×10^. In addition, these amorphous alloys have a high hardness and an excellent corrosion resistance. Therefore. Co-Ti-B amorphous alloys are promised as the soft magnetic materials for electromagnetic devices