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Search Results: 1 - 10 of 174312 matches for " John B. Auel "
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Infrastructure Enhancement to Support Value-Added Bioproduct Recovery  [PDF]
Jason S. Gordon, John B. Auel, Nia Blair-Agyeman, Iris B. Montague, Rubin Shmulsky
Natural Resources (NR) , 2018, DOI: 10.4236/nr.2018.94009
Abstract:
The purpose of this research was to identify and make available new and existing information to facilitate more effective response by individuals, organizations, and government entities when storms and other forms of catastrophic disturbance lead to unplanned influxes of downed timber and woody debris across the southeastern United States. To this end, this project explored attitudes and behaviors of stakeholders regarding their post disaster timber salvage experiences. Findings are reported from twelve focus group sessions with forestry decision makers, including landowners, loggers, foresters, and agency representatives. Data were analyzed using an iterative coding process that organized large quantities of text into fewer categories and identified emergent themes. Relationships between themes and categories were described within and across cases based on their concurrence, antecedents, or consequences. This technique was followed by a content analysis focusing on discovering underlying meanings and understanding explicit versus euphemistic terms. Findings center around economic limitations and opportunities, social networks in resource utilization, and diverse interpretations of the disaster event. As well, findings demonstrate how risk perceptions and disaster experience interact to construct social meanings for disaster and associated preparedness activities. Implications include value-added utilization options for woody storm debris that have been pursued in past storm events and lessons learned that can inform future decisions.
Vector bundles of rank four and A_3 = D_3
Asher Auel
Mathematics , 2011, DOI: 10.1093/imrn/rns140
Abstract: Over a scheme with 2 invertible, we show that a vector bundle of rank four has a sub or quotient line bundle if and only if the canonical symmetric bilinear form on its exterior square has a lagrangian subspace. For this, we exploit a version of "Pascal's rule" for vector bundles that provides an explicit isomorphism between the moduli functors represented by projective homogeneous bundles for reductive group schemes of type A_3 and D_3. Under additional hypotheses on the scheme (e.g. proper over a field), we show that the existence of sub or quotient line bundles of a rank four vector bundle is equivalent to the vanishing of its Witt-theoretic Euler class.
Surjectivity of the total Clifford invariant and Brauer dimension
Asher Auel
Mathematics , 2011, DOI: 10.1016/j.jalgebra.2015.06.043
Abstract: Merkurjev's theorem--the statement that the 2-torsion of the Brauer group is represented by Clifford algebras of quadratic forms--is in general false when the base is no longer a field. The work of Parimala, Scharlau, and Sridharan proves the existence of smooth complete curves over local fields, over which Merkurjev's theorem is equivalent to the existence of a rational theta characteristic. Here, we prove that for smooth curves over a local field or surfaces over a finite field, replacing the Witt group by the total Witt group of all line bundle-valued quadratic forms recovers Merkurjev's theorem: the 2-torsion of the Brauer group is always represented by even Clifford algebras of line bundle-valued quadratic forms.
Remarks on the Milnor conjecture over schemes
Asher Auel
Mathematics , 2011,
Abstract: The Milnor conjecture has been a driving force in the theory of quadratic forms over fields, guiding the development of the theory of cohomological invariants, ushering in the theory of motivic cohomology, and touching on questions ranging from sums of squares to the structure of absolute Galois groups. Here, we survey some recent work on generalizations of the Milnor conjecture to the context of schemes (mostly smooth varieties over fields of characteristic not 2). Surprisingly, a version of the Milnor conjecture fails to hold for certain smooth complete p-adic curves with no rational theta characteristic (this is the work of Parimala, Scharlau, and Sridharan). We explain how these examples fit into the larger context of an unramified Milnor question, offer a new approach to the question, and discuss new results in the case of curves over local fields and surfaces over finite fields.
Control of Diapause by Acidic pH and Ammonium Accumulation in the Hemolymph of Antarctic Copepods
Sabine Schründer, Sigrid B. Schnack-Schiel, Holger Auel, Franz Josef Sartoris
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0077498
Abstract: Life-cycles of polar herbivorous copepods are characterised by seasonal/ontogenetic vertical migrations and diapause to survive periods of food shortage during the long winter season. However, the triggers of vertical migration and diapause are still far from being understood. In this study, we test the hypothesis that acidic pH and the accumulation of ammonium (NH4+) in the hemolymph contribute to the control of diapause in certain Antarctic copepod species. In a recent study, it was already hypothesized that the replacement of heavy ions by ammonium is necessary for diapausing copepods to achieve neutral buoyancy at overwintering depth. The current article extends the hypothesis of ammonium-aided buoyancy by highlighting recent findings of low pH values in the hemolymph of diapausing copepods with elevated ammonium concentrations. Since ammonia (NH3) is toxic to most organisms, a low hemolymph pH is required to maintain ammonium in the less toxic ionized form (NH4+). Recognizing that low pH values are a relevant factor reducing metabolic rate in other marine invertebrates, the low pH values found in overwintering copepods might not only be a precondition for ammonium accumulation, but in addition, it may insure metabolic depression throughout diapause.
The transcendental lattice of the sextic Fermat surface
Asher Auel,Christian B?hning,Hans-Christian Graf v. Bothmer
Mathematics , 2013, DOI: 10.4310/MRL.2013.v20.n6.a2
Abstract: We prove that the integral polarized Hodge structure on the transcendental lattice of a sextic Fermat surface is decomposable. This disproves a conjecture of Kulikov related to a Hodge theoretic approach to proving the irrationality of the very general cubic fourfold.
Semiorthogonal decompositions and birational geometry of del Pezzo surfaces over arbitrary fields
Asher Auel,Marcello Bernardara
Mathematics , 2015,
Abstract: We study the birational properties of geometrically rational surfaces from a derived categorical point of view. In particular, we give a criterion for the rationality of a del Pezzo surface over an arbitrary field, namely, that its derived category decomposes into zero-dimensional components. For del Pezzo surfaces of degree at least 5, we construct explicit semiorthogonal decompositions by subcategories of modules over semisimple algebras arising as endomorphism algebras of vector bundles and we show how to retrieve information about the index of the surface from Brauer classes and Chern classes associated to these vector bundles.
Is Alzheimer’s Disease an Adaptability Disorder? What Role Does Happiness Have in Treatment, Management and Prevention  [PDF]
John B. Myers
World Journal of Neuroscience (WJNS) , 2015, DOI: 10.4236/wjns.2015.53020
Abstract: A case presentation indicating the importance of “happiness” in childhood causing memory block until the patent presented with probable mixed vascular and neurodegenerative memory loss at 60 years of age is presented to highlight the role of emotional factors in causing the disease. The question of whether Alzheimer’s disease is an adaptability disorder is raised, given the patient blocked out her memory of her childhood experience. The importance of “happiness” as a treatment goal raises issues of advocacy and Guardianship as well as capacity, which is addressed by actual case reference and court action in defence of the patient’s rights to have their wishes respected and observed. Functional mental capacity assessment, using the Functional Mental State Measure (FMSM) gives a greater indication of neuronal reserve than standard cognitive testing, as it helps to unravel the dilemma associated with pure cognitive assessment in Alzheimer’s Disease as well as vascular dementia patients and patients who, despite retained and intact functional capacity and ability to express their wishes, i.e. “best interest”, are “wrongly” placed under Guardianship. Maladaptive responses, to control the change in external environment that are sensed or perceived, and which lead to disorder or to susceptibility to disease, exemplify a General Systems Theory approach, in which appropriate and adequate responses to environmental change, in behavioural terms, by a person, whether independently, or as the recipient or giver, or both, leads to functional interaction and happiness.
Erratum to “Is Alzheimer’s Disease an Adaptability Disorder? What Role Does Happiness Have in Treatment, Management and Prevention” [World Journal of Neuroscience 5 (2015) 180-188]  [PDF]
John B. Myers
World Journal of Neuroscience (WJNS) , 2015, DOI: 10.4236/wjns.2015.54027
Abstract: A case presentation indicating the importance of “happiness” in childhood causing memory block until the patent presented with probable mixed vascular and neurodegenerative memory loss at 60 years of age is presented to highlight the role of emotional factors in causing the disease. The question of whether Alzheimer’s disease is an adaptability disorder is raised, given the patient blocked out her memory of her childhood experience. The importance of “happiness” as a treatment goal raises issues of advocacy and Guardianship as well as capacity, which is addressed by actual case reference and court action in defence of the patient’s rights to have their wishes respected and observed. Functional mental capacity assessment, using the Functional Mental State Measure (FMSM) gives a greater indication of neuronal reserve than standard cognitive testing, as it helps to unravel the dilemma associated with pure cognitive assessment in Alzheimer’s Disease as well as vascular dementia patients and patients who, despite retained and intact functional capacity and ability to express their wishes, i.e. “best interest”, are “wrongly” placed under Guardianship. A General Systems approach, which recognises functional interaction as optimal and withdrawal or inadequate and/or inappropriate response as not, provides further understanding of the relationship between emotional factors, memory and neurodegenerative (Alzheimer’s) disease.
Quadric surface bundles over surfaces
Asher Auel,R. Parimala,V. Suresh
Mathematics , 2012,
Abstract: Let T -> S be a finite flat morphism of degree two between regular integral schemes of dimension at most two (and with 2 invertible), having regular branch divisor D. We establish a bijection between Azumaya quaternion algebras on T and quadric surface bundles over S with simple degeneration along D. This is a manifestation of the exceptional isomorphism A_1^2 = D_2 degenerating to the exceptional isomorphism A_1 = B_1. In one direction, the even Clifford algebra yields the map. In the other direction, we show that the classical algebra norm functor can be uniquely extended over the discriminant divisor. Along the way, we study the orthogonal group schemes, which are smooth yet nonreductive, of quadratic forms with simple degeneration. Finally, we provide two surprising applications: constructing counter-examples to the local-global principle for isotropy, with respect to discrete valuations, of quadratic forms over surfaces; and a new proof of the global Torelli theorem for very general cubic fourfolds containing a plane.
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