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In 1999, evidence for time variability of the fine-structure constant based on observation of quasars was announced [9] but a much more precise study based on CH molecules did not find any variation. [10] [11] An upper bound of 10 −17 per year for the time variation, based on laboratory measurements, was published in 2008. [12]
Stress is a pressure, defined as a directional force over area. When a rock is subjected to stresses, it changes shape. When the stress is released, the rock may or may not return to its original shape. That change in shape is quantified by strain, the change in length over the original length of the material in one dimension.
A fracture will sometimes form a deep fissure or crevice in the rock. Fractures are commonly caused by stress exceeding the rock strength, causing the rock to lose cohesion along its weakest plane. [1] Fractures can provide permeability for fluid movement, such as water or hydrocarbons.
When strain attains higher values, high enough to lead to failure, its slope versus time exhibits an abrupt change. At this specific time the creep function appears a minimum. [ 2 ] In most cases DMTA (Dynamic mechanical thermal analysis) can be used to determine the viscoelastic behavior of samples as a function of time.
A fissure in the lava field of Þingvellir National Park, Iceland. A ground fissure, also called an earth fissure, is a long, narrow crack or linear opening in the Earth's crust. Ground fissures can form naturally, such as from tectonic faulting and earthquakes, or as a consequence of human activity, such as oil mining and groundwater pumping.
The AI model was trained on the personal data of Denmark’s population and was shown to predict the people’s chances of dying more accurately than any existing system, scientists from the ...
In statistical analysis, change detection or change point detection tries to identify times when the probability distribution of a stochastic process or time series changes. In general the problem concerns both detecting whether or not a change has occurred, or whether several changes might have occurred, and identifying the times of any such ...
The tool, called Life2vec, can predict life expectancy based on its study of data from 6 million Danish people. Findings were published in a study titled "Using sequences of life-events to predict ...