The position of singular lines for orthorhombic (ORT) media with fixed diagonal elements the elasticity matrix cij, i=1…6 is studied under condition that c11, c22, c33>c66>c44>c55. In this case, off-diagonal coefficients c12, c13, c23 are chosen so some values d12=c12+c66, d13=c13+c55, d23=c23+c44 zero. For medium, where only one d12, d13, d23 zero, contains points in planes symmetry. ...

We separated platelets from whole blood and incorporated them into In-Ill and Te-99m agents. Sn-GHA, Tropolone, Oxine (sulphate) and HMPAO were used to diffuse radionuclides into the platelets. The effects of time, temperature, PH of incubation media; volume and concentration of ionophore; and volume and activity of ln-l 13m C13 and Te-99m on labeling efficiency were studied.

We modify a previously suggested GMM estimator in a spatial panel regression model by taking into account the difference between disturbances and regression residuals and derive its asymptotic properties. Simulation results and an empirical application to Indonesian rice data illustrate the improvement in finite samples. JEL Classification: C13, C21

We take a fresh look at Theil’s BLUS residuals and ask why they have gone out of fashion. All our simulation experiments indicate that tests based on BLUS residuals have higher power than those based on the more popular recursive residuals, even in those cases (structural breaks) where intuition would favour the recursive residuals. JEL Classification: B23; C10; C13; C20