Splitting Monoidal Stable Model Categories

If C is a stable model category with a monoidal product then the set of homotopy classes of self-maps of the unit S forms a commutative ring. An idempotent e of this ring will split the homotopy category. We prove that provided the localised model structures exist, this splitting of the homotopy category comes from a splitting of the model category, that is, C is Quillen equivalent to the product of C localised at the object eS and C localised at the object (1-e)S. This Quillen equivalence is strong monoidal and is symmetric when the monoidal product of C is.Comment: 19 pages. To appear in the Journal of Pure and Applied Algebr

Classifying Rational G-Spectra for Finite G

We give a new proof that for a finite group G, the category of rational G-equivariant spectra is Quillen equivalent to the product of the model categories of chain complexes of modules over the rational group ring of the Weyl group of H in G, as H runs over the conjugacy classes of subgroups of G. Furthermore the Quillen equivalences of our proof are all symmetric monoidal. Thus we can understand categories of algebras or modules over a ring spectrum in terms of the algebraic model.Comment: 30 page

Students Asking Questions: Facilitating Questioning Aids Understanding and Enhances Software Engineering Skills

By providing a means to ask questions anonymously, we provide a non-threatening environment in which we encourage students to fully understand and criticise their assignments. As well as providing practical assistance for those who are struggling with course work, it demonstrates a practical reinforcement of ideas that are commonly taught in courses on software engineering, but it does so in a context that they can directly relate to - their desire to achieve good grades. The approach is based around the use of an HTML form to enable the anonymous submission of questions to staff and the dynamic refinement of assignment specifications. Examples of its use in a course on object-oriented design and C++ are given

Too Many Probabilities: Statistical Evidence of Tort Causation

Medical scientific testimony is often expressed in terms of two different probabilities: 1. The increased probability of harm if a person is exposed, for example, to a toxin. 2. The observed relationship is an artifact of the experimental method. This article demonstrates that neither probability, taken alone or together, measures whether the preponderance of the evidence test is met

Observations and Recommendations on the Internationalisation of Software

As computer programs enter the lives of more and more people worldwide, it is becoming increasingly unacceptable to assume that software with a user interface designed for an indigenous English speaking market will be acceptable outside its country of origin simply by changing the currency symbol. Developers of software who are serious about expanding sales into new markets must consider many issues when giving thought either to the creation of new software or the modification of existing software to work within the linguistic and cultural constraints of these new markets. The purpose of this paper is to examine the task of preparing software to be used in countries and cultures other than that in which it is created. We do this by reviewing some of the most important localisation issues that have been identified, and some of the tools and practices that are available to the software designer to deal with them. We shall also consider some of the areas of the software development process that are currently less well understood and supported. Our major emphasis is in non-graphical applications targeted at European markets. Keywords: Internationalisation, I18N, Localising, Enabling, Multi-lingual

Rational Z_p-Equivariant Spectra

We find a simple algebraic model for rational G-equivariant spectra, where G is the p-adic integers, via a series of Quillen equivalences. This model, along with an Adams short exact sequence, will allow us to easily perform constructions and calculations.Comment: 24 page

Laboratory Procedure for Measuring the Effectiveness of Dust Control Palliatives

Creation of fugitive dust on unpaved roads results in the loss of up to 25 mm (one inch) of surface aggregate annually (FHWA, 1998). On these roads, shearing forces created by vehicles dislodge the fine aggregate fraction (silt and clay) that binds the coarse aggregate. Turbulent airflow created by vehicles loft these fine particles in plumes of fugitive dust that impact health, safety, and quality of life. The loss of these particles results in raveling of the road surface, culminating in large annual losses of surface aggregate. Chemical dust control (palliatives) is an attractive option. However, there are currently no accepted field or laboratory performance testing procedures for chemical road dust palliatives. The lack of a method to predict palliative performance forces engineers and road managers into a trial-and-error methodology or reliance on personal judgment and supplier claims to determine what will work best on their unpaved road or runway surfaces. The overall objective of this research was to finalize the development of a laboratory test procedure for evaluating different dust control formulations and application rates required to effectively control the airborne suspension of dust particles in the size range (aerodynamic diameter) of 10 μm or less.Pacific Northwest Transportation Consortiu

Guidelines for the Use of Synthetic Fluid Dust Control Palliatives on Unpaved Roads

The amount of small soil particles, dust, lost from typical unpaved roads to fugitive dust is staggering. A 1 km stretch of unpaved road can contribute over 2400 kg of dust to the atmosphere (4.2 ton/mile) in a typical 3-month summer season. Road managers typically manage dust from unpaved roads with various dust-control palliatives, which are effective for up to 1 year. Synthetic fluids are a relatively new category of dust-control palliatives. Unlike the more commonly used dust-control palliatives, such as salts, engineering guidelines do not exist for the application and maintenance of synthetic fluids on unpaved roads. To fill this void, we present through this document guidelines for road design and maintenance, palliative selection, application, and care of synthetic fluid-treated roadways.Midwest Industrial Supply United States Department of TransportationReport Documentation Page .............................................................................................. ii Disclaimer ......................................................................................................................... iii List of Figures .................................................................................................................... vi Executive Summary............................................................................................................. 1 CHAPTER 1.0 – Introduction............................................................................................... 4 CHAPTER 2.0 – Background.............................................................................................. 6 Measurements of the Effectiveness of Dust Palliatives .....................................................10 CHAPTER 3.0 – Guidelines .............................................................................................. 16 Road Design and Maintenance...........................................................................................16 Palliative Selection..............................................................................................................20 Application .........................................................................................................................22 Areas Requiring Special Attention......................................................................................26 Maintenance .......................................................................................................................27 CHAPTER 4.0 – Summary................................................................................................. 31 CHAPTER 5.0 – References.............................................................................................. 3

Climate Code Foundation

Poster presented at the VSMF Symposium held in the Unilever Centre on 2011-01-17Climate Code Foundation - who are we? A non-profit organisation founded in August 2010; our goal is to promote the public understanding of climate science, by increasing the visibility and clarity of the software used in climate science and by encouraging climate scientists to do the same, by encouraging good software development and management practices among climate scientists and by encouraging the publication of climate science software as Open Source. [http://www.climatecode.org/