Cementitious materials are brittle and have an inherent weakness in resisting in tension. Fibre reinforcement is an effective mean of enhancing the fracture characteristics of concrete. An increase in fibre volume concentration can have an adverse effect on the tensile performance of a SFRC when very high strength, end-hooked fibres are used in a matrix of moderate strength. The study showed that an increase in fibre volume concentration can lead to a decreased in the proportion of end-hooked fibres straightening through the end-hook. In this case, failure of the matrix surrounding the hook...
Cementitious materials are brittle and have an inherent weakness in resisting in tension. Fibre reinforcement is an effective mean of enhancing the fr...
In the 1950s and 1960s, the CIA undertook a series of research and operational programs aimed at gaining control of human behavior, commonly known as mind control. The most famous and notable of these was MKULTRA, which from 1953 to 1964 spawned 149 subprojects that developed and studied "a number of procedures for influencing and predicting human behavior by chemical and psychological means." The intention for the techniques was to "have both defensive applications ... and offensive applications (e.g. the use of psychochemicals to control or discredit an individual)." The Project MKULTRA...
In the 1950s and 1960s, the CIA undertook a series of research and operational programs aimed at gaining control of human behavior, commonly known as ...
Until relatively recently, the connection between British imperial history and the history of early America was taken for granted. In recent times, however, early American historiography has begun to suffer from a loss of coherent definition as competing manifestos demand various reorderings of the subject in order to combine time periods and geographical areas in ways that would have previously seemed anomalous. It has also become common place to announce that the history of America is best accounted for in America itself in a three-way melee between "settlers," the indigenous populations,...
Until relatively recently, the connection between British imperial history and the history of early America was taken for granted. In recent times, ho...