In quantitative research, validity is one of the most essential manifestations of research method.
Among the metals, chromium, cobalt, and rhodium have been the most essential in the research.
This was a reaction to the position of Campbell & Stanley [ 3], who stated that internal validity is the most essential issue in research, and Cronbach's position that evaluation cannot serve policymaking if its external validity is not guaranteed [ 4].
This year, in the midst of both disappointments and successes, we are reminded that the contribution of trial participants is the most essential element of HIV vaccine research and development.
The expected ensuing controversy of this approach should be one of the most essential challenges of current restoration ecology research and practice.
In addition, our observations again stress the importance of performing pharmacodynamic research in the most essential tissue available, being the tumour.
Obviously, the focus of the research efforts should be on genes most essential in pathogenesis of given disease.
"This is the most essential question of the whole matter," said Andrew Platzer, who researches car, aircraft and robotic safety at Carnegie Mellon University.
In this study, bibliometric tools have been selected to determine the major and essential research trends in the field of big data research, and the most relevant research areas upon which big data has a significant impact.
The electrolyte membrane is the most essential parts of a fuel cell unit, and consequently has been the subject of considerable research and development.
