Digital Commons Network^™

Farming Systems To Manage Salinity. Farmer Directed Research, Development And Extension. Research Results 2001, Richard Olive

Natural resources published reports

More and more of Western Australia's agnicultural lands are becoming saline. Currently it is estimated that about 18 milliion ha of land are affected to a greater or lesser degree by salinity causing production losses estimated at about $70 million a year.

Unless ways are found to halt and reverse the salinisation of land it is estimated that another 4.4 million ha could become saline over the next 50 years.

Grain growers and the Federal Government, through the Grains Research and Development Corporation (GRDC). are investing $12 4 million in R&D across Australia to develop productive solutions to the salinity …

Soilguide (Soil Guide) : A Handbook For Understanding And Managing Agricultural Soils, Geoff Allan Moore

Bulletins 4000 -

This handbook integrates the current knowledge of soils in south-western Australia in a user-friendly form. It describes how to assess which soil properties influence production and land degradation in the agricultural area and summarises management options to remedy or minimise soil limitations. The potential for growing a large range of crops and pastures can be assessed. In particular, the links between soil morphology, soil properties, management and agronomy are emphasised. The manual is designed for use at the paddock scale or for site assessment, but it can also be used at a catchment or regional scale. It is specifically designed …

An Analysis Of A Radio Frequency Sensor As A Means To Remotely Sense Selected Surface Topographies In An Agriculture Environment, Barry Michael Alexia

Dissertations and Theses @ UNI

Remote sensing is the science and art of obtaining information about an object, area or phenomenon through the analysis of data acquired by a device that is not in contact with the object, area, or phenomenon under investigation. The remotely sensed data can be of many forms, including variations in force distribution, acoustic wave distribution, or electromagnetic energy distribution.Information thus acquired can be used for observing,monitoring, and studying planetary surfaces and environments.

Because there are many ways to acquire data about targets of interest, there are many types of remote sensors that can be used, including visible, infrared, and active …

Teaching Effectiveness In An Introductory High School Honors Physics Course As Measured By The Force Concept Inventory, April Crawford Moore

Dissertations and Theses @ UNI

Of importance to many teachers is that students emerge from a course of study with an acceptable level of comprehension of the subject matter presented and that students' course grades reflect that understanding. The primary question of this research was, "How effective in promoting comprehension of Newtonian concepts is this teacher's use of selected interactive strategies?" Secondary questions were: 1. What modifications to instruction, if any, have to be made for implementation of interactive-engagement strategies? 2. Following instruction in mechanics, which misconceptions probed by the Force Concept Inventory (FCI) are retained by students, and which misconceptions are corrected? 3. How …

Flow Through Well Screens As A Function Of Pump Intake Location, Kristjan F. Bekker

Theses and Dissertations

Greater well efficiency and lower production costs may result from a knowledge of water flow through well screens. Current practice generally locates the intake of a pump in the cased section of the well above the screen. This work shows that placing the pump within the screen will increase well efficiency and therefore lower energy cost. This work also shows a correlation of increased well efficiency with respect to larger sand size, larger screen slot size, and lower flow rates.

A semicircular model based on the radial symmetry of a well and screen was used to simulate water flow from …

Small-Angle X-Ray Studies Of Soot Inception And Growth, Jan P. Hessler, Soenke Seifert, Randall E. Winans, Thomas H. Fletcher

Faculty Publications

The high spectral intensity of X-rays produced by the undulator at the Basic Energy Sciences Synchrotron Radiation Center of Argonne's Advanced Photon Source has allowed us to perform small-angle X-ray scattering (SAXS) studies of the initial distribution of soot particles formed by various fuels. SAXS provides an in situ probe of the morphology of soot in the region between 1 and 100 nm and complements the ex situ technique of electron microscopy. The basic aspects of SAXS and its potential are illustrated with measurement on a laminar flame of acetylene in air. The more complex fuel toluene has been studied …

Voronoi Cells, Fractal Dimensions And Fibre Composites, J. Summerscales, F. J. Guild, N. R.L. Pearce, P. M. Russell

School of Engineering, Computing and Mathematics

No abstract provided.

A Non-Authoritative Educational Metadata Ontology For Filtering And Recommending Learning Objects, David Wiley, Mimi M. Recker

Faculty Publications

Digital libraries populated with learning objects are becoming popular tools in the creation of instructional technologies. Many current efforts to create standard metadata structures that facilitate the discovery and instructional use of learning objects recommend a single, authoritative metadata record per version of the learning object. However, as we argue in this paper, a single metadata record -- particularly one with fields that emphasize knowledge management and technology, while evading instructional issues -- provides information insufficient to support instructional utilization decisions. To put learning objects to instructional use, users must examine the individual objects, forfeiting the supposed benefits of the …

Non-Social Play As A Risk Factor In Social And Emotional Development, Charissa S. L. Cheah, Larry J. Nelson, Kenneth H. Rubin

Faculty Publications

Children spend much of their youthful energy engaged in play. Indeed, play, in its various forms, represents a serious business – not only for the active participations, but also for students of the phenomenon. To many researchers, play is viewed as a generative fore in children's social, emotional, and cognitive development (see Rubin, Fein, & Vandenberg, 1983; Saracho & Spodek, 1998; Fromberg & Bergen, 1998). The extent to which children engage in play with others is of added developmental significance. In light of the complexity and developmental significance of children's play and especially play with peers, it seems important to …

A Usage-Based Simulation Of Spanish S-Weakening, David Eddington

Faculty Publications

The pronunciation of Spanish /s/ as an aspirate [h] (or its deletion) is studied in a usagebased simulation that assumes that prior linguistic experiences are stored as memory traces, and that these stored experiences, instead of generalizations abstracted from them, are the source of the knowledge speakers have of their language. This exploratory simulation was carried out using the algorithm of Analogical Modeling of Language (Skousen 1989, 1992).