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As of 2024, Dias has had five of his research papers retracted, and five other papers have received an expression of concern. [ 271 ] [ 272 ] Victor Ninov (US), a nuclear chemist formerly at Lawrence Berkeley National Laboratory , was dismissed from his position after falsifying his work on the discovery of elements 116 and 118 .
Charpy test sample with a notch. In mechanical engineering and materials science, a notch refers to a V-shaped, U-shaped, or semi-circular defect deliberately introduced into a planar material. In structural components, a notch causes a stress concentration which can result in the initiation and growth of fatigue cracks.
A notched sample is generally used to determine impact energy and notch sensitivity. The test is similar to the Charpy impact test but uses a different arrangement of the specimen under test. [ 1 ] The Izod impact test differs from the Charpy impact test in that the sample is held in a cantilevered beam configuration as opposed to a three-point ...
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Examples by discipline The sources available to you in your undergraduate research could often be more accurately described as primary source surrogates. For example, instead of examining an individual's diary directly, you may find yourself using reproduced images of its pages—or, more likely yet, a typed transcription of its contents.
According to the standards, the constraining dimension of the specimen is the thickness of the material. Compact tension specimens are used for experiments where there is a shortage of material available due to their compact design. For rolled materials the notch should be aligned with the roll direction where the material is weakest.
A research question is "a question that a research project sets out to answer". [1] Choosing a research question is an essential element of both quantitative and qualitative research. Investigation will require data collection and analysis, and the methodology for this will vary widely. Good research questions seek to improve knowledge on an ...
To record data, the paper stock between a hole and the nearest edge was removed by a special notching tool. The holes were assigned a meaning dependent upon a particular application. For example, one hole might record the answer to a yes/no question on a survey, with the presence of a notch meaning "yes".