Thermally induced errors originating from machine tool errors have received significant attention recently because high speed and precise machining is now the principal trend in manufacturing processes using CNC machine tools.
This reconstruction clearly indicates that the last common ancestor of the extant Archaea was a complex organism, most likely with over 2,500 genes, and that the principal trend in subsequent evolution of almost all archaeal lineages was gene loss leading to genome streamlining.
The principal trend that emerges from the papers reviewed here is that clearly-marked, bike-specific facilities (i.e. cycle tracks at roundabouts, bike routes, bike lanes, and bike paths) were consistently shown to provide improved safety for cyclists compared to on-road cycling with traffic or off-road with pedestrians and other users.
On Maritain's view, what distinguishes the fine arts from the work of artisans is that the fine arts are primarily concerned with beauty — i.e., "that which upon being seen pleases" (Art and Scholasticism, p. 23; Creative Intuition, p. 160); this classical view, again adapted from Aquinas, runs counter to some of the principal trends in aesthetics and art since the eighteenth century.
In this work, we used a simplified model to delineate just the principal trends in the behavior of systems under study – without the aim to get precise structural information.
Principal trends such as declining family size, increasing childlessness, later motherhood, increasing life expectancy and net immigration levels can easily last five decades or more.
In Brazil, periodic nationwide population-based surveys conducted since the 1970s monitored not only the principal trends of morbidity and mortality, but also those related to access and use of health services by diverse socioeconomic strata of the general population.
The Economic and Social Research Council (ESRC) guidance for narrative synthesis [ 26], which we followed and adapted, stipulates that a narrative analysis should be driven by a theoretical model, should include a preliminary synthesis of included study findings, an assessment of the principal trends and relationships in the data, and an examination of the robustness of the findings.
In addition to utilizing conventional correspondence analysis (CA) [ 17], in the present study, I introduce a new method, namely, canonical correspondence analysis (CCA) [ 18], which could help reveal the principal trends of codon usage bias patterns and identify the most correlated variables simultaneously.
The principal evolutionary trend in brain development has been toward elaboration.
Above all, the principal evolutionary trend of primates has been the elaboration of the brain, particularly of that portion of the cerebral hemispheres known as the neopallium or neocortex.
