502 research outputs found
Northern wheatbelt water supply study
Department of Agriculture surveys have shown that many farms in Western australia\u27s northern wheatbelt have inadequate water supplies. More than 80 per cent of all farms in that area depend soley on groundwater for watering livestock, a much higher percentage than for most other farming areas. Because groundwater salinities have increased in recent years, concern is held for the long-term future of this recource.
In contrast to more southern agricultural areas, farm dams in the northern wheatbelt are relatively uncommon. Only 30 per cent of the existing dams in the northern wheatbelt constitute effective water supplies. More than half of the ineffective dams regularly go dry, caused by those dams being too small and too shallow, or by an inadequate catchment, or both
Proalgebraic crossed modules of quasirational presentations
We introduce the concept of quasirational relation modules for discrete and
pro- presentations of discrete and pro- groups and show that aspherical
presentations and their subpresentations are quasirational. In the pro--case
quasirationality of pro--groups with a single defining relation holds. For
every quasirational (pro-)relation module we construct the so called
-adic rationalization, which is a pro-fd-module
. We provide the isomorphisms
and , where and
stands for continuous prounipotent completions and corresponding
prounipotent presentations correspondingly. We show how
embeds into a sequence of abelian prounipotent
groups. This sequence arises naturally from a certain prounipotent crossed
module, the latter bring concrete examples of proalgebraic homotopy types. The
old-standing open problem of Serre, slightly corrected by Gildenhuys, in its
modern form states that pro--groups with a single defining relation are
aspherical. Our results give a positive feedback to the question of Serre.Comment: This is a corrected version of the paper which appeared in the
Extended Abstracts Spring 2015, Interactions between Representation Theory,
Algebraic Topology and Commutative Algebra, Research Perspectives CRM
Barcelona, Vol.5, 201
Workplace-Based Practicum: Enabling Expansive Practices
Effective pre-service teacher education integrates theoretical and practical knowledge. One means of integration is practicum in a school workplace. In a time of variable approaches to, and models of, practicum, we outline an innovative model of school immersion as part of a teacher preparation program. We apply Fuller and Unwinâs (2004) expansive and restrictive conceptual framework of workplace learning to a case study of an immersive practicum experience to discuss themes of participation, personal development and institutional arrangements in relation to school-based practicum. Enablers and constraints are identified for our immersion model of workplace-based practicum. Based on the data analysis a number of implications for structuring an expansive practicum learning experience are outlined
Merredin townsite groundwater pumping and desalination pilot project
Townsite salinity affects more than 40 towns in the WA wheatbelt. Waterlogging and salinity are responsible for damamge to townsite infrastructure. Through groundwater pumping and desalination, the State Salinity Council (now the Natural Resource Management Council) granted Merredin the the chance to prevent further damage to the townsite by funding this project
The de Rham homotopy theory and differential graded category
This paper is a generalization of arXiv:0810.0808. We develop the de Rham
homotopy theory of not necessarily nilpotent spaces, using closed dg-categories
and equivariant dg-algebras. We see these two algebraic objects correspond in a
certain way. We prove an equivalence between the homotopy category of schematic
homotopy types and a homotopy category of closed dg-categories. We give a
description of homotopy invariants of spaces in terms of minimal models. The
minimal model in this context behaves much like the Sullivan's minimal model.
We also provide some examples. We prove an equivalence between fiberwise
rationalizations and closed dg-categories with subsidiary data.Comment: 47 pages. final version. The final publication is available at
http://www.springerlink.co
The failed liberalisation of Algeria and the international context: a legacy of stable authoritarianism
The paper attempts to challenge the somewhat marginal role of international factors in the study of transitions to democracy. Theoretical and practical difficulties in proving causal mechanisms between international variables and domestic outcomes can be overcome by defining the international dimension in terms of Western dominance of world politics and by identifying Western actions towards democratising countries. The paper focuses on the case of Algeria, where international factors are key in explaining the initial process of democratisation and its following demise. In particular, the paper argues that direct Western policies, the pressures of the international system and external shocks influence the internal distribution of power and resources, which underpins the different strategies of all domestic actors. The paper concludes that analysis based purely on domestic factors cannot explain the process of democratisation and that international variables must be taken into more serious account and much more detailed
Deformation quantisation for unshifted symplectic structures on derived Artin stacks
We prove that every -shifted symplectic structure on a derived Artin
-stack admits a curved deformation quantisation. The classical
method of quantising smooth varieties via quantisations of affine space does
not apply in this setting, so we develop a new approach. We construct a map
from DQ algebroid quantisations of unshifted symplectic structures on a derived
Artin -stack to power series in de Rham cohomology, depending only on a
choice of Drinfeld associator. This gives an equivalence between even power
series and certain involutive quantisations, which yield anti-involutive curved
deformations of the dg category of perfect complexes. In
particular, there is a canonical quantisation associated to every symplectic
structure on such a stack, which agrees for smooth varieties with the
Kontsevich--Tamarkin quantisation for even associators.Comment: 27pp.; v2 Propositions 1.23 and 3.10 added; v3 several small
additions; v4 several changes following referee's comments, to appear in
Select
Derived coisotropic structures II: stacks and quantization
We extend results about -shifted coisotropic structures from part I of
this work to the setting of derived Artin stacks. We show that an intersection
of coisotropic morphisms carries a Poisson structure of shift one less. We also
compare non-degenerate shifted coisotropic structures and shifted Lagrangian
structures and show that there is a natural equivalence between the two spaces
in agreement with the classical result. Finally, we define quantizations of
-shifted coisotropic structures and show that they exist for .Comment: 45 pages. Contains the second half of arXiv:1608.01482v1 with new
material adde
Fibrinolytic protease production by new Streptomyces sp. DPUA 1576 from amazon lichens
Background
Streptomyces sp. DPUA 1576 from Amazon lichens was studied to protease and fibrinolytic production. A 22 factorial experimental design was applied to optimize its protease enzyme production using two independent variables, namely soybean flour and glucose concentrations.
Results
The optimal conditions to obtain high protease production (83.42 U/mL) were 1.26% soybean flour and 1.23% glucose concentration. A polynomial model was fitted to correlate the relationship between the two variables and protease activity. In relation to fibrinolytic activity, the highest activity of 706.5 mm2 was obtained at 1.7% soybean flour and 1.0% glucose concentration, which was 33% higher than plasmin. Fibrinolytic production was not optimized in the studied conditions.
Conclusions
These results show that the optimization of the culture medium can enhance protease production, thus becoming a good process for further research. In addition, Streptomyces sp. DPUA 1576, isolated from Amazon lichens, might be a potential strain for fibrinolytic protease production.The authors thank CAPES (National Council for the Improvement of Higher Education) for the scholarship and CNPq/RENORBIO (National Counsel of Technological and Scientific Development, N. 55146/2010-3) and FACEPE (Fundacao de Amparo a Ciencia e Tecnologia do Estado de Pernambuco, 0158-2.12/11) for the financial support
The ASEAN community-based tourism standards: looking beyond certification
This paper reports findings from an opportunity study on the appropriateness of implementing community-based tourism standards (CBTS) certification through the Association of Southeast Asian Nations (ASEAN) criteria, as a way to improve sustainable tourism provision in the region. Framed by critical reflections on community-based tourism (CBT) literature and existing sustainable tourism standards (STS) practices, qualitative research consisting of interviews with six key industry experts provided core insights into a number of CBTSâ implementation challenges. Findings indicate the main hindering factors for the implementation of CBTS to be the lack of adequate governance, limited funding and insufficient community capacity. The study concluded that although at the moment the full implementation of CBTS as a certification programme would be premature, ASEAN-CBTSâ criteria are a useful benchmarking and strategic planning tool for local communities, which would eventually lead to improved CBT benefits, standards and performance in the region. At the same time, this paper argues that aspects including CBT competitiveness and service delivery need to be tackled first to create fruitful grounding for CBT certification
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