in this work, the mechanism for fracture of brittle substances such as rocks under a uniform normal tension is considered. the oriented straight micro-cracks are mostly created in all the polycrystalline materials resulting from the stress concentrations. the present work focuses on the interactions of the pre-existing micro-cracks, which can grow and propagate within a rock-like specimen. the ...

suicide is a well-known public health problem in the united states. macroeconomic conditions, among many other factors, because of their impacts on psychological well-being of individuals, are thought to be linked to suicide attempts. however, previous research on the relationship between suicide rates and macroeconomic conditions, especially that of labor market conditions, has resulted into a...

although russian studies existed in world academies in preceding centuries in different styles, it was only in the second half of the 20th century that major academic centers in europe and the united states paid serious attention to understanding the soviet :union: and its current developments by attracting some emigrant soviet authors and scientists. for these academic centers, recognizing the...

on the basis of constitution and social and cultural contexts, each country has its own private international law system. concerning countries with federal system like the united states of america, conflict of laws not only may occur between laws of the united states and law of the other countries, but also in a distinctive manner, among states of the usa together. european :union: is in the sa...

Suicide is a well-known public health problem in the United States. Macroeconomic conditions, among many other factors, because of their impacts on psychological well-being of individuals, are thought to be linked to suicide attempts. However, previous research on the relationship between suicide rates and macroeconomic conditions, especially that of labor market conditions, has resulted into a...

in the united states, 40 – 50% of the men and women 50 years of age or older regularly use multivitamin/mineral (mvm) supplements, making the annual sales of these supplements over $11 billion. however, the question remains whether using mvm supplements is beneficial to health. this article reviews the results of randomized studies of mvm supplements and individual vitamins/mineral supplements ...