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Over a career spanning nearly seven decades, Jürgen Habermas - one of the most important European philosophers of the twentieth and twenty-first centuries - has produced a prodigious and influential body of work. In this Lexicon, authored by an international team of scholars, over 200 entries define and explain the key concepts, categories, philosophemes, themes, debates, and names associated with the entire constellation of Habermas's thought. The entries explore the historical, philosophical and social-theoretic roots of these terms and concepts, as well as their intellectual and disciplinary contexts, to build a broad but detailed picture of the development and trajectory of Habermas as a thinker. The volume will be an invaluable resource for students and scholars of Habermas, as well as for other readers in political philosophy, political science, sociology, international relations, cultural studies, and law.
The powder-bed laser additive manufacturing (AM) process is widely used in the fabrication of three-dimensional metallic parts with intricate structures, where kinetically controlled diffusion and microstructure ripening can be hindered by fast melting and rapid solidification. Therefore, the microstructure and physical properties of parts made by this process will be significantly different from their counterparts produced by conventional methods. This work investigates the microstructure evolution for an AM fabricated AlSi10Mg part from its nonequilibrium state toward equilibrium state. Special attention is placed on silicon dissolution, precipitate formation, collapsing of a divorced eutectic cellular structure, and microstructure ripening in the thermal annealing process. These events alter the size, morphology, length scale, and distribution of the beta silicon phase in the primary aluminum, and changes associated with elastic properties and microhardness are reported. The relationship between residual stress and silicon dissolution due to changes in lattice spacing is also investigated and discussed.
Cerebrovascular reactivity monitoring has been used to identify the lower limit of pressure autoregulation in adult patients with brain injury. We hypothesise that impaired cerebrovascular reactivity and time spent below the lower limit of autoregulation during cardiopulmonary bypass will result in hypoperfusion injuries to the brain detectable by elevation in serum glial fibrillary acidic protein level.
We designed a multicentre observational pilot study combining concurrent cerebrovascular reactivity and biomarker monitoring during cardiopulmonary bypass. All children undergoing bypass for CHD were eligible. Autoregulation was monitored with the haemoglobin volume index, a moving correlation coefficient between the mean arterial blood pressure and the near-infrared spectroscopy-based trend of cerebral blood volume. Both haemoglobin volume index and glial fibrillary acidic protein data were analysed by phases of bypass. Each patient’s autoregulation curve was analysed to identify the lower limit of autoregulation and optimal arterial blood pressure.
A total of 57 children had autoregulation and biomarker data for all phases of bypass. The mean baseline haemoglobin volume index was 0.084. Haemoglobin volume index increased with lowering of pressure with 82% demonstrating a lower limit of autoregulation (41±9 mmHg), whereas 100% demonstrated optimal blood pressure (48±11 mmHg). There was a significant association between an individual’s peak autoregulation and biomarker values (p=0.01).
Individual, dynamic non-invasive cerebrovascular reactivity monitoring demonstrated transient periods of impairment related to possible silent brain injury. The association between an impaired autoregulation burden and elevation in the serum brain biomarker may identify brain perfusion risk that could result in injury.
Following the inaugural Australian Association for Environmental Education (AAEE) research symposium in November 2014, we — a group of emerging researchers in Environmental Education/Sustainability Education (EE/SE) — commenced an online collaboration to identify and articulate our responses to the main themes of the symposium. Identifying as #aaeeer, our discussions coalesced into four main areas that we felt captured not only some of our current research interests, but also ‘under-explored’ areas that need further attention and that also held the potential for meaningful and ‘dangerous’ contributions to EE/SE research and practice. These themes were: (1) uncertain futures, (2) traditional knowledges for the future, (3) community EE/SE, and (4) the rise of the digital, explorations of which we present in this article. By no means intended to capture all that is worth researching in this field, these themes, and this article, are deliberately presented by #aaeeer to spark discussions, as well as showcase an example of online collaboration between researchers in a number of countries.