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1996

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Articles 2371 - 2400 of 2437

Full-Text Articles in Physical Sciences and Mathematics

Fuel Characteristics Of Rehabilitated Bauxite Mines In Western Australia, Sarah J. Collins Jan 1996

Fuel Characteristics Of Rehabilitated Bauxite Mines In Western Australia, Sarah J. Collins

Theses : Honours

This investigation assessed the fuel characteristics of Alcoa of Australia's rehabilitated bauxite mines in the south-west of Western Australia. The study determined the fuel loads, their composition and structure. The characteristics of fuel were determined, their relationship with time ascertained, and the similarity of these characteristics to the jarrah forest ecosystems that they have replaced was discussed. Pits aged from four to twenty years since rehabilitation were assessed. Predictive models were developed to allow the rapid assessment of fuel. The fuel characteristics in two controlled bum areas were also assessed to how much fuel would burn in a fire and …

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Rehabilitation Of A Salt Affected Wetland, Natalie Reeves Jan 1996

Rehabilitation Of A Salt Affected Wetland, Natalie Reeves

Theses : Honours

There exists an urgent need to rehabilitate salt-affected and degraded wetlands in the south-west of Western Australia, particularly in water resource catchments. Various rehabilitation techniques have been developed for such areas, which address the problem of integrating water catchment management and surrounding land use. Despite this, there has been limited success in restoring salt affected wetlands in the south west region of Western Australia. This project was established to develop a method for the rehabilitation of wetlands in the south west of Western Australia, using the western Coollangatta Farmland wetland as a case study. This site was chosen because of …

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The Design And Implementation Of A Toolkit For The Creation Of Virtual Environments, Jesse Kinross-Smith Jan 1996

The Design And Implementation Of A Toolkit For The Creation Of Virtual Environments, Jesse Kinross-Smith

Theses : Honours

Virtual Reality is a field that is steadily increasing in popularity and interest. New developments in both hardware and software have empowered developers with new devices allowing faster and better quality interaction with virtual environments. However, the emphasis of research in virtual environments has been more concerned with development of new display and input devices, as opposed to the investigation of different methods of interaction that a three-dimensional environment offers. This project designs and implements a three-dimensional, interactive, virtual environment development system upon an existing three-dimensional rendering engine. The aim of the project is to allow users to generate virtual …

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Simulator For The Performance Analysis Of Cpm Schemes In An Indoor Wireless Environment, Ronald Chua Jan 1996

Simulator For The Performance Analysis Of Cpm Schemes In An Indoor Wireless Environment, Ronald Chua

Theses : Honours

A software simulator for characterising Continuous Phase Modulation (CPM) schemes in an indoor multipath environment has been developed using SIMULINK and MATLAB. The simulator is capable of simulating a wide range of CPM schemes to determine bandwidth efficiency and robustness to additive white Gaussian noise (AWGN) and Rician fading. Initial trials of the simulator indicate that the simulator is functioning correctly. Eventually, the simulator will be used to determine the most suitable modulation scheme for the development of an actual indoor wireless system.

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An Investigation Into An Effective Method Of Automatically Analysing Oracle Applications To Count Function Points, J. L. Wong Jan 1996

An Investigation Into An Effective Method Of Automatically Analysing Oracle Applications To Count Function Points, J. L. Wong

Theses : Honours

Function Point Analysis (FPA) is a synthetic software estimation metric used for computing the size and complexity of applications. It was first introduced by Allan. J. Albrecht during the mid-seventies, as a result of a lengthy research based on applications that were developed using COBOL and PL/1 programming languages. The purpose of this research· is to investigate the possibility, and the most effective method, of automatically performing a Function Point Analysis on Oracle applications that consist of Oracle Forms and Oracle Reports. The research revealed a seemingly lack of other researches on this topic. As FPA was invented a few …

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An Investigation Into The Use Of The Freshwater Crayfish Marron (Cherax Tenuimanus) As A Flagship For The Restoration Of The Blackwood River, Rachael Nickoll Jan 1996

An Investigation Into The Use Of The Freshwater Crayfish Marron (Cherax Tenuimanus) As A Flagship For The Restoration Of The Blackwood River, Rachael Nickoll

Theses : Honours

The Marron (Cherax tenuimanus) is arguably the most easily identified and ecologically important aquatic animal species in south-western Australian rivers. In fact it is quintessientially south-western Australian, endemic to the south-west corner of the continent and supporting a recreational fishery and commercial aquaculture industry within the state. Marron have keystone qualities as hosts of various epiphytic flora and fauna, and are central to the food web within south-west rivers. Their sensitivity to depleted oxygen conditions have also made them a potential "indicator" for water quality degradation. The study investigated these qualities in reference to the marron's potential as …

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Dissolution Of Gypsum From Field Observations, Alexander Klimchouk, Franco Cucchi, Jose Maria Calaforra, Sergey Aksem, Furio Finocchiaro, Paolo Forti Jan 1996

Dissolution Of Gypsum From Field Observations, Alexander Klimchouk, Franco Cucchi, Jose Maria Calaforra, Sergey Aksem, Furio Finocchiaro, Paolo Forti

International Journal of Speleology

The paper reports the results of field measurements of gypsum dissolution in various countries (Ukraine, Spain, Italy and others) and in different environments (river waters, precipitation, vadose zone, unconfined aquifer, perched cave lakes, ephemeral streams in caves, confined aquifer, cave air).

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The Orbital Period Of Bk Lyncis (Pg 0917 + 342), F. A. Ringwald, J. R. Thorstensen, R. K. Honeycutt, J. W. Robertson Jan 1996

The Orbital Period Of Bk Lyncis (Pg 0917 + 342), F. A. Ringwald, J. R. Thorstensen, R. K. Honeycutt, J. W. Robertson

Dartmouth Scholarship

Long-term light curves of the cataclysmic variable BK Lyn = PG 0917 + 342 from the Indiana Automated CCD photometric telescope (‘RoboScope’) and the Harvard College Observatory plate archive reveal no dwarf nova outbursts. Two radial velocity studies show its orbital period to be 107.97 ;1 0.07 min, confirming that it does have an orbital period shorter than the period gap for cataclysmic variables. Whether this is the first nova-like variable below the period gap or a dwarf nova with rare outbursts resembling WZ Sge is still unclear, however.

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Speleothems And Cave Minerals In Gypsum Caves, Paolo Forti Jan 1996

Speleothems And Cave Minerals In Gypsum Caves, Paolo Forti

International Journal of Speleology

For many years gypsum karst was considered to contain little of interest from the point of view of chemical deposits. Relatively recently a general study of speleothems has begun within gypsum karst areas in different climatic zones around the world. So far this ongoing research has shown that gypsum karst can be very interesting in terms of its contained chemical deposits. In this chapter, all that is currently known about speleothems in gypsum caves is reported systematically, and the distinctive climatic control over them is emphasised.

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Gypsum Karst Of The Eastern-European Plain, Vjacheslav Andrejchuk, Alexander Klimchouk Jan 1996

Gypsum Karst Of The Eastern-European Plain, Vjacheslav Andrejchuk, Alexander Klimchouk

International Journal of Speleology

Description of karst in the Eastern European Plain, comprising the following regions: Baltic, Timansky, Pinego-Severodvinsky, Volgo-Kamsky, Pre-Ural, Pre-Caspian, Donetsk and Podol'sko Bukovinsky.

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A New Genus And Species Of Troglobitic Trechinae (Coleoptera, Carabidae) From Southern China, Augusto Vigna Taglianti Jan 1996

A New Genus And Species Of Troglobitic Trechinae (Coleoptera, Carabidae) From Southern China, Augusto Vigna Taglianti

International Journal of Speleology

Guizhaphaenops zorzini n.gen.n.sp. is described from Anjia Yan Cave, Shuicheng County, Guizhou (China). This highly specialized troglobite species is easily recognizable from the other cave dwelling Trechini from China for the main morphological external characters, but its true relationships remain uncertain, the male being still unknown. Similar in habitus to Cathaiaphaenops and to Sinotroglodytes, the new taxon is much more related to the latter, being dorsally glabrous and having the mentum fused with the submentum, with a deep oval fovea, but it differs in its elongated head, with incomplete frontal furrows and without posterior frontal setae.

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Gypsum Karst Of The Baltic Republics, Bernardas Paukstys, Vytautas Narbutas Jan 1996

Gypsum Karst Of The Baltic Republics, Bernardas Paukstys, Vytautas Narbutas

International Journal of Speleology

The Baltic Republics of Estonia, Latvia and Lithuania have karst areas developed in both carbonate and gypsiferous rocks. In the north, within the Republic of Estonia, Ordovician and Silurian limestones and dolomites crop out, or are covered by glacial Quaternary sediments. To the south, in Latvia and Lithuania, gypsum karst is actively developing in evaporites of Late Devonian (Frasnian) age. Although gypsum and mixed sulphate-carbonate karst only occupy small areas in the Baltic countries, they have important engineering and geo-ecological consequences. Due to the rapid dissolution of gypsum, the evolution of gypsum karst causes not only geological hazards such as …

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Weathering Crust And Karren On Exposed Gypsum Surfaces, Tommaso Macaluso, Ugo Sauro Jan 1996

Weathering Crust And Karren On Exposed Gypsum Surfaces, Tommaso Macaluso, Ugo Sauro

International Journal of Speleology

The evolution of gypsum bare rock surfaces is the result both of volume changes of the outer rock layer and mass wasting by dissolutional processes. Some unusual weathering processes induce an increase in the volume of the outer gypsum layer, resulting in the development of a “weathering crust” and of characteristic forms such as small ridges and bubbles. However, the more typical erosional forms are dissolutional ones of karren type, which are commonly interconnected, or superimposed upon the previously described forms. In this chapter a classification system is proposed and discussed, within which the magnitude, order and geometry of the …

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The Dissolution And Conversion Of Gypsum And Anhydrite, Alexander Klimchouk Jan 1996

The Dissolution And Conversion Of Gypsum And Anhydrite, Alexander Klimchouk

International Journal of Speleology

The development of karst is a complex system driven by the dissolution of a host rock and the subsequent removal of dissolved matter by moving water. It is the process that, at various stages, initiates or triggers associated processes including erosion, collapse and subsidence. The dissolution of sulphate rocks proceeds by different mechanisms and at different rates to those associated with the dissolution of carbonate rocks. For each rock type different factors influence the process. This chapter is an attempt to summarise the present knowledge of the dissolution chemistry and kinetics of gypsum and anhydrite. These are important for the …

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Lithobius Nuragicus N.Sp., A New Lithobius From A Sardinian Cave (Chilopoda, Lithobiomorpha), Marzio Zapparoli Jan 1996

Lithobius Nuragicus N.Sp., A New Lithobius From A Sardinian Cave (Chilopoda, Lithobiomorpha), Marzio Zapparoli

International Journal of Speleology

A new species of Lithobius from a Sardinian cave (Cagliari, Santadi, loc. Su Benatzu, Grotta “Pirosu”, 576 Sa/Ca, m 270) is described. Lithobius nuragicus n. sp. belongs to the subgenus Lithobius s. str. and is related to Lithobius variegatus Leach, 1814, occurring in the British Isles, Brittany, Channel Isles, Iberian Peninsula, Maghreb, Sicily and Southern Italy. This new species is differentiated from L. variegatus by the number of prosternal teeth (3+3), the number and arrangement of ocelli (1+3; little, depigmented, not contiguous to each other, in the center of a depigmented area, posterosuperior ocellus larger than the other ocelli), the …

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Gypsum Karst Of Great Britain, Anthony H. Cooper Jan 1996

Gypsum Karst Of Great Britain, Anthony H. Cooper

International Journal of Speleology

In Great Britain the most spectacular gypsum karst development is in the Zechstein gypsum (late Permian) mainly in north-eastern England. The Midlands of England also has some karst developed in the Triassic gypsum in the vicinity of Nottingham. Along the north-east coast, south of Sunderland, well-developed palaeokarst, with magnificent breccia pipes, was produced by dissolution of Permian gypsum. In north-west England a small gypsum cave system of phreatic origin has been surveyed and recorded. A large actively evolving phreatic gypsum cave system has been postulated beneath the Ripon area on the basis of studies of subsidence and boreholes. The rate …

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Gypsum Karst Of Germany, Stephan Kempe Jan 1996

Gypsum Karst Of Germany, Stephan Kempe

International Journal of Speleology

Description of gypsum karst and caves in Germany.

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Environmental Problems In Gypsum Karst Terrains, Alexander Klimchouk, Vjacheslav Andrejchuk Jan 1996

Environmental Problems In Gypsum Karst Terrains, Alexander Klimchouk, Vjacheslav Andrejchuk

International Journal of Speleology

Description of environmental problems in gypsum karst areas, especially of the effects related to human impacts that are unique to gypsum karst systems or most commonly occur herein. The paper deals with pollution (oil, radioactive substances and fertilizers), mining activity, underground water abstraction, construction of dams and reservoirs, collapse and subsidence hazards giving examples of former Soviet Union.

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Gypsum Karst In China, Lu Yaoru, Anthony H. Cooper Jan 1996

Gypsum Karst In China, Lu Yaoru, Anthony H. Cooper

International Journal of Speleology

The Peoples Republic of China has the largest gypsum resources in the world and a long history of their exploitation. The gypsum deposits range in age from Pre-Cambrian to Quaternary and their genesis includes marine, lacustrine, thermal (volcanic and metasomatic), metamorphic and secondary deposits. The gypsum is commonly associated with other soluble rocks such as carbonates and salt. These geological conditions, regional climate differences and tectonic setting strongly influence the karstification process resulting in several karst types in China. Well developed gypsum palaeokarst and some modem gypsum karst is present in the Fengfeng Formation (Ordovician) gypsum of the Shanxi and …

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Gypsum Karst In The South Of The Siberian Platform, Russia, Yuri Trzcinski Jan 1996

Gypsum Karst In The South Of The Siberian Platform, Russia, Yuri Trzcinski

International Journal of Speleology

Description of gypsum karst in Siberia.

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Gypsum Karst Of The World: A Brief Overview, Alexander Klimchouk, Paolo Forti, Anthony Cooper Jan 1996

Gypsum Karst Of The World: A Brief Overview, Alexander Klimchouk, Paolo Forti, Anthony Cooper

International Journal of Speleology

Short description of caves and karsts in gypsum of different parts of the World.

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Gypsum Karst In The Western Ukraine, Alexander Klimchouk Jan 1996

Gypsum Karst In The Western Ukraine, Alexander Klimchouk

International Journal of Speleology

The great gypsum karst of the Western Ukraine, which is associated with Miocene (Badenian) gypsum, provides the worlds foremost examples of intrastratal gypsum karst and speleogenesis under artesian conditions. Differential neotectonic movements have resulted in various parts of the territory displaying different types (stages) of intrastratal karst, from deep-seated, through subjacent, to entrenched. Internal gypsum karstification proceeded mainly under confined hydrogeological conditions. While such development still continues in part of the territory, other parts exhibit entrenched karst settings. Huge relict maze cave systems have been explored here, five of which are currently the longest known gypsum caves in the world. …

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Some Examples Of Gypsum Karsts And The More Important Gypsum Caves In Spain, Jose Maria Calaforra, Antonio Pulido-Bosch Jan 1996

Some Examples Of Gypsum Karsts And The More Important Gypsum Caves In Spain, Jose Maria Calaforra, Antonio Pulido-Bosch

International Journal of Speleology

Spain possesses some of the most important examples of gypsum karst in Europe, in terms of the extent and variety of the gypsiferous outcrops. These are divided into gypsum belonging to the Triassic, Palaeogene and Neogene epochs, each of which displays different lithological and structural aspects. Some of Spain’s most significant gypsum karsts, from the speleological standpoint, are described, and these share a common characteristic of all supporting the development of large caves. Reference is made to the geomorphology, hydrogeology and hydrochemistry of the gypsum karsts of Sorbas, Vallada and Gobantes-Meliones, which provide significant examples of intrastratal karst, speleogenesis by …

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The Gypsum Karst Of Italy, Paolo Forti, Ugo Sauro Jan 1996

The Gypsum Karst Of Italy, Paolo Forti, Ugo Sauro

International Journal of Speleology

Gypsum karst has been studied in Italy since the last decades of the l9th Century. In 1917 the geographer Olinto Marinelli published “Fenomeni carsici delle regioni gessose d’Italia”, a fundamental synthesis of the early research. He distinguished 56 different morpho-karstic gypsum units and/or areas, which are all different in size and character, and described them, paying special attention to their surface morphology and hydrology. Marinelli listed all the main gypsum units and only a few secondary outcrops were overlooked. After Marinelli’s synthesis, except for some discussion of archaeological caves, only a few papers about gypsum karst and environment were published …

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Early Spectra Of The Supernova 1987f, Gary Wegner, Steven R. Swanson Jan 1996

Early Spectra Of The Supernova 1987f, Gary Wegner, Steven R. Swanson

Dartmouth Scholarship

Spectroscopy is presented of the peculiar Type n supernova 1987F, sometimes called the 'Type I Seyfert imposter'. This supernova differed from others of Type n in the slow evolution in its light curve and the strengths and profiles of the spectral lines. The time covered is 1987 April 2 to June 8, when the spectrum of the supernova evolved from a simple nearly featureless blue continuum with superimposed narrow emission lines of H I, He I, [N II], [0 III], and [S II] to a complicated combination of broad and narrow emission components in H I and He I plus …

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First Record Of Parastenocarididae (Crustacea, Copepoda, Harpacticoida) From Subterranean Freshwater Of Insular Greece And Description Of Two New Species, Vezio Cottarelli, Maria Cristina Bruno Jan 1996

First Record Of Parastenocarididae (Crustacea, Copepoda, Harpacticoida) From Subterranean Freshwater Of Insular Greece And Description Of Two New Species, Vezio Cottarelli, Maria Cristina Bruno

International Journal of Speleology

The genus Parastenocaris, new for Greece, has been discovered in the hyporheic habitat of Kos and Kythira Island with two new species, that are described and discussed in this work. Parastenocaris aesculapii n. sp. shares some characters with P. nolli from Germany and P. italica from Italy, Macedonia and Turkey. Parastenocaris aphroditis n. sp. belongs, according to the Authors, to a group of species living exclusively in estuarine interstitial habitats, which are all characterised by peculiar morphology and ecology, that are as well considered and interpreted.

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Sulphate Rocks As An Arena For Karst Development, Alexander Klimchouk, Vjacheslav Andrejchuk Jan 1996

Sulphate Rocks As An Arena For Karst Development, Alexander Klimchouk, Vjacheslav Andrejchuk

International Journal of Speleology

The rocks in which karst systems develop are most commonly composed of carbonate sulphate and chloride minerals. The sulphate minerals are quite numerous, but only gypsum and anhydrite form extensive masses in sedimentary sequences. Other minerals, which represent sulphates of K, Mg and Na, normally occur as minor beds (0.1-5.0 m), or as inclusions associated with chloride rocks. However some minerals precipitated in salt-generating basins, such as mirabilite and glauberite (typically formed in the Kara-Bogaz-Gol Gulf, salt lakes of Siberia and in China), form sequences up to 5-10 m thick where karst may develop. Due to the very high solubility …

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Valence-Band Electronic Structure Of Mos2 And Cs/Mos2(0002) Studied By Angle-Resolved X-Ray Photoemission Spectroscopy, Michelle Richards-Babb Jan 1996

Valence-Band Electronic Structure Of Mos2 And Cs/Mos2(0002) Studied By Angle-Resolved X-Ray Photoemission Spectroscopy, Michelle Richards-Babb

Faculty & Staff Scholarship

The angle dependence of the valence-band photoemission from the trigonal prismatic layered MoS2shows both the forward-scattering features normally observed in core-level photoelectron diffraction and, in addition, the initial-state orbital character associated with partially occupied, nonbonding MoIV(4dz2+4dx2−y2 +4dxy) orbitals near the top of the valence band. The difference in forward scattering between the Mo and S emitters is also used to assess relative contributions from the Mo and S atomic orbitals at specific binding energies within the valence band. Deposition of cesium (0.23 ML Cs with 1 ML equal to the Cs saturation coverage) onto the basal plane of MoS2 …

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Modelling An Optical Fiber Bragg Grating, Claudio Oliveira Egalon Jan 1996

Modelling An Optical Fiber Bragg Grating, Claudio Oliveira Egalon

Electrical & Computer Engineering Theses & Dissertations

A theoretical investigation of a single mode optical fiber with one and two superimposed Bragg grating is presented. The formulation relies in the determination of an approximate solution in the asymptotic region of one of the fiber parameters. A correction is then applied to the asymptotic solution using the Method of the Successive Approximations also known as the Piccard Method. The approximation was then compared to the numerical solution using the Runge-Kutta method. Assuming that each Bragg grating has modulation frequencies given by Ω1 and Ω2, it has been found that the second Bragg grating shifts the …

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A Pathsearch Damped Newton Method For Computing General Equilibria, Steven P. Dirkse, Michael C. Ferris Jan 1996

A Pathsearch Damped Newton Method For Computing General Equilibria, Steven P. Dirkse, Michael C. Ferris

University Faculty Publications and Creative Works

Computable general equilibrium models and other types of variational inequalities play a key role in computational economics. This paper describes the design and implementation of a pathsearch damped Newton method for solving such problems. Our algorithm improves on the typical Newton method (which generates and solves a sequence of LCPs) in both speed and robustness. The underlying complementarity problem is reformulated as a normal map so that standard algorithmic enhancements of Newton's method for solving nonlinear equations can be easily applied. The solver is implemented as a GAMS subsystem, using an interface library developed for this purpose. Computational results obtained …

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