The Rumsfeld Effect: The unknown unknown

A set of studies tested whether people can use awareness of ignorance to provide enhanced test consistency over time if they are allowed to place uncertain items into a “don’t know” category. For factual knowledge this did occur, but for a range of other forms of knowledge relating to conceptual knowledge and personal identity, no such effect was seen. Known unknowns would appear to be largely restricted to factual kinds of knowledge

Positron lifetime measurements in chiral nematic liquid crystals

Positron lifetimes in the isotropic phases of chiral nematic liquid crystal formulations and their mixtures up to the racemic level were measured. The lifetime spectra for all liquid crystal systems were analyzed into three components. Although the individual spectra in the left- and right-handed components are identical, their racemic mixtures exhibit much larger orthopositronium lifetimes; these larger lifetimes indicate the presence of larger microvoids. This result is consistent with the reportedly higher thermodynamic stability and color play range in the racemic mixtures of chiral nematic liquid crystals

A Comperative Study of Managerial Decision of Selected Units of Saurashtra Units

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Time-delayed models of gene regulatory networks

We discuss different mathematical models of gene regulatory networks as relevant to the onset and development of cancer. After discussion of alternativemodelling approaches, we use a paradigmatic two-gene network to focus on the role played by time delays in the dynamics of gene regulatory networks. We contrast the dynamics of the reduced model arising in the limit of fast mRNA dynamics with that of the full model. The review concludes with the discussion of some open problems

American power and identities in the age of Obama

Although the election of Barack Obama to the US presidency represents a landmark event in the history of that country, questions remain over its broader political significance. What is the likelihood of Obama's foreign and national security policies differing fundamentally from those of the Bush administrations Does Obama's election signal a post-racial phase in American national life What are the factors that suggest opportunities to change and expand American identities as opposed to those that limit Obama's sphere of action This article introduces the special issue and suggests that although Obama's room for manoeuvre is limited by legacies inherited from the Bush administration, Obama's own appointments to high office as well as other actions, despite the availability of alternative courses, indicate that he is not the transformational president he claimed to be. American identities, therefore, are deeply embedded and remain heavily imbued with racial, religious and imperial features