T H E N E E D T O E X T E N D old-age and survivors insurance to domestic workers in pr ivate homes, a group on the lowest rung of the economic ladder, has, i n general, no t been questioned or denied. This article presents the results of a l i m i t e d sample study of these workers i n their present relat ion to the program—the extent to which they now cont r ibute through their wages derived...

The effects of thermal radiation and heat transfer over an unsteady stretching surface embedded in a porous medium in the presence of heat source or sink are studied. The governing time dependent boundary layer equations are transformed to ordinary differential equations containing radiation parameter, permeability parameter, heat source or sink parameter, Prandtl number, and unsteadiness param...

Recent developments of theoretical studies on spin nanotubes are reviewed, especially focusing on the S = 1/2 three-leg spin tube. In contrast to the three-leg spin ladder, the tube has a spin gap in the case of the regular-triangle unit cell when the rung interaction is sufficiently large. The effective theory based on the Hubbard Hamiltonian indicates a quantum phase transition to a gapless s...

The article presented the modelling of torsional vibration signal marine diesel engine, MAN B&W 6S46MC-C7, installed in general cargo ships 34000 DWT, built at Pha Rung Shipyard (Vietnam). authors imitated signal, based on established when engine works normal firing and mis-firing state, according to Class Regulation Rules for new building steel hull calculating measuring propulsion shaft-l...

This article examines the teachings of several Christian and Sufi mystics on the position of reason in the spiritual life, from Al-Hallaj (d. 922) to David R. Hawkins (b. 1927). In the plethora of “maps,” “stages,” and “ladders” discussed by mystics, the level of reason is highly regarded as a “rung” of spiritual attainment. However, reason alone is not enough to transport the soul to the most ...

The tetra-nuclear title compound, [Sn4(CH3)8(C2H5O)2O2(C3H4N3S)2], lies about a center of inversion; the mol-ecule features a three-rung-staircase Sn4O4 core in which two Sn(IV) atoms are bridged by the 4-methyl-5-sulfanyl-idene-4,5-dihydro-1H-1,2,4-triazol-1-ide group. The negatively charged N atom of the group binds to the terminal Sn(IV) atom at a shorter distance [Sn-N = 2.240 (3) Å] compar...

Topological chirality of a molecule is realized when any representation of its graph is topologically distinct from its mirror image, i.e. if it can not be converted to its mirror image by continuous deformation in 3D-space. [1] This property implies that the graph of the molecule is non-planar. Molecular systems with an intrinsically non-planar graph are scare. Their graphs can be contracted t...