According to a recent argument, models play two essential roles in the argumentative structure of solid state physics and chemistry (Hofmann 1990). On the one hand, models are the culmination of phenomenological description. That is, models are idealized representations of the molecular structures thought to be causally responsible for the processes experimentally monitored and measured. Secondly, dieoretical physicists and chemists require that models ultimately be cast in a mathematical form appropriate for the application of the Schroedinger equation. In this respect models become the means through which the Schroedinger equation gives a theoretical unity to what would otherwise be a disparate set of empirical phenomenological laws and descriptions with limited scope. That is, it is an important theoretical goal to show that experimentally generated phenomenological laws can be approximately derived through an application of the Schroedinger equation to a necessarily idealized and simplified mathematical description of the relevant system. The two functions of models are not incompatible, but they do reflect two distinct theoretical orientations toward the interpretation of data.
Abstract.Creationists who object to evolution in the science curriculum of public schools often cite Jonathan Well's book Icons of Evolution in their support (Wells 2000). In the third chapter of his book Wells claims that neither paleontological nor molecular evidence supports the thesis that the history of life is an evolutionary process of descent from preexisting ancestors. We argue that Wells inappropriately relies upon ambiguities inherent in the term 'Darwinian' and the phrase 'Darwin's theory'. Furthermore, he does not accurately distinguish between the overwhelming evidence that supports the thesis of common descent and controversies that pertain to causal mechanisms such as natural selection. We also argue that Wells' attempts to undermine the evidence in support of common descent are flawed and his characterization of the relevant data is misleading. In particular, his assessment of the 'Cambrian explosion' does not do justice to the fossil record. Nor do his selective references to debate about molecular and paleontological phylogenies constitute a case against common descent. We conclude that the fossil and molecular evidence is more than sufficient to warrant science educators to present common descent as a well-established scientific fact. We also argue that diagrams depicting the 'tree of life' can be pedagogically useful as simplified representations of the history of life.
Recent work by historians and philosophers has called attention to the complexity of modern experimental physics and its intricate relation to interpretive and explanatory theory (Franklin 1987, Hacking 1983, Galison 1987 and 1989, Pickering 1984 and 1987). One point of general agreement has been that the contexts of discovery and justification often significantly overlap and do not uniformly correlate with experiment and theory. Instead, intended applications, instrumentation, experiment, phenomenological description, explicative models, and explanatory theory all act both as incentives and as constraints during the production of scientific knowledge. The present paper investigates how one node of this network operates in the domain of solid state physics and chemistry. In particular, a case study analysis of how models function in transition metal oxide research provides ample support for several conclusions.First, it must be emphasized that the term “theory” can have misleading connotations in this domain if it is allowed to imply a single and foundational level of explanatory generality.
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