Fractional Differential Equations

Object-oriented analysis

Harmonic Analysis and the Theory of Probability. By S. Bochner pp. 176. 35s. 1955. (California University Press and Cambridge University Press)

Advective flows rapidly transport water, solutes, and particles into and out of permeable sand beds and significantly affects the biogeochemistry of coastal environments. In this paper, we reviewed the drivers of porewater and groundwater advection in permeable shelf sediments in an attempt to bridge gaps among different disciplines studying similar problems. We identified the following driving forces: (1) terrestrial hydraulic gradients, (2) seasonal changes in the aquifer level on land moving the location of the subterranean estuary, (3) wave setup and tidal pumping, (4) water level differences across permeable barriers, (5) flow- and topography-induced pressure gradients, (6) wave pumping; (7) ripple and other bed form migration, (8) fluid shear, (9) density-driven convection, (10) bioirrigation and bioturbation, (11) gas bubble upwelling, and (12) sediment compaction. While these drivers occur over spatial scales ranging from mm to km, and temporal scales ranging from seconds to years, their ultimate biogeochemical implications are very similar (i.e., they are often a source of new or recycled nutrients to seawater and transform organic carbon into inorganic carbon). Drivers 2–12 result in no net water input into the ocean. Taking all these mechanisms into account, we conservatively estimate that a volume equivalent to that of the entire ocean is filtered by permeable sediments at time scales of about 3000 years. Quantifying the relative contribution of these drivers is essential to understand the contribution of sediments to the global cycles of matter.

The driving forces of porewater and groundwater flow in permeable coastal sediments: a review

Glutamine utilization by the small intestine.

The majority of wireless sensor networks are built on bespoke platforms, that is, custom designed and built hardware with a light weight software stack. There are a number of advantages to this approach. First, the ability to closely match and minimise the resource requirements (e.g., power consumption and communications protocols) to those that are suitable for the intended deployment. Second, as an entire hardware and software stack is often designed or at least optimised for each deployment, the latest advances can be quickly incorporated. However, this model generally requires the expertise of hardware and software engineers to design and build the system. In turn, this increases the cost and tends to shift the focus away from the initial science towards the development of the wireless sensor networks. This paper explores the utility and practicality of building wireless sensor networks based on commercially available embedded single board computing platforms using standard consumer operating systems. Our test bed was built using Gumstix computing platform, running a Linux Operating System (OS) with a java-based middleware coupled to low-cost scientific grade sensors. Test deployments have found this to be a highly versatile solution, able to leverage the flexibility of commodity hardware and software while maintaining reasonable utility.

/pdf/benefits-of-building-wireless-sensor-networks-on-commodity-40pqilzbm6.pdf

Benefits of building wireless sensor networks on commodity hardware and software stacks

Online auctions are a rapidly growing platform to exchange items of just about anything, from common to collectors' items in different region around the world. Researchers continue their efforts to understand further the real behaviour and bidding patterns of buyers and sellers, the fraudulent traits and even devise countermeasures to prevent auction fraud. Most often, the researchers' noble work ends with frustration due to unavailability of real auction data. Online auction sources are unwilling to provide the real auction data and often cite "commercial, security and privacy" as reasons. This paper presents an application tool that collects real auction data from an ongoing auction for a given criteria, and automatically returns later to collect the data from a recently completed auction. From the knowledge of the authors, the work presented here is the first serious attempt to create an openly available application tool that will be free for use by other researchers.

/pdf/an-application-tool-for-collecting-real-auction-data-55yyshwmnv.pdf

An application tool for collecting real auction data

Online auction technologies are revolutionizing the way we conduct business online. However, the proliferation of auction related research and the development of new auction security techniques are often limited by the uncooperative behaviour of the major online auctioneers. Due to the limited availability of quality auction data and literature on online auction software design, we have created our own online auction server to facilitate auction research. This paper describes our experiences with designing online auction software. We present a basic online model upon which more sophisticated auction scenarios can be crafted. We address website design, preliminary security, the database schema, transaction and timing issues, and also show how software bidding agents can interact with the model. Our model is grounded in object oriented techniques and is open source so that other researchers can expand upon our approach.

Customize Online Auction Software

A given quantity of fill may be placed over a given circular area in the shape of a cone, a truncated cone, with nearly uniform thickness. Depending on the shape of the fill, different non-uniform initial excess pore water pressure distributions can exist in the underlying saturated soil layer. This paper investigates the influence of the shape of the fill on the time-dependant consolidation behaviour of the underlying circular soil layer, which is draining only along a peripheral drain. Plots of the average degree of consolidation against time factor and degree of consolidation isochrones are developed for different axisymmetric embankment geometries. The results show that the way the load is spread within the circular area has significant influence on the rate of pore water pressure dissipation throughout the soil layer. The exact degree of consolidation at a point within the clay is computed to illustrate the variation in the degree of consolidation with the radial distance.

Radial consolidation of soil layer under truncated cone fill

On-line quizzes are used to help first year University Mathematics students identify weaknesses in their basic skills and improve them. Quizzes developed as a formative tool have been utilised at JCU for eight years. However, before this research no-one has questioned the effectiveness of quizzes for this task. We present a description of the quizzes used in a core first year Mathematics subject at JCU and provide a statistical overview of their usage and efficacy for the intended task.

/pdf/are-online-quizzes-an-effective-tool-for-mastering-basic-40rvp2ma59.pdf

Wayne Read

Papers

Benefits of building wireless sensor networks on commodity hardware and software stacks

An application tool for collecting real auction data

Customize Online Auction Software

Radial consolidation of soil layer under truncated cone fill

Are online quizzes an effective tool for mastering basic algebra