Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons™

Open Access. Powered by Scholars. Published by Universities.®

University of Wollongong

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 1831 - 1860 of 4868

Full-Text Articles in Physical Sciences and Mathematics

What Students Are Telling Us About Why They Left Their Ict Course, Madeleine R. H Roberts, Tanya Mcgill, Tony Koppi Jan 2011

What Students Are Telling Us About Why They Left Their Ict Course, Madeleine R. H Roberts, Tanya Mcgill, Tony Koppi

Faculty of Informatics - Papers (Archive)

Student attrition is an issue of particular concern in the field of ICT because the industry faces staffing shortfalls. The study described in this paper provides further understanding of the causes of attrition from ICT courses by exploring the reasons students give for leaving their ICT courses. An online survey of early leavers from four Australian universities was conducted. The results show that many factors can contribute to the attrition of ICT students, and that for many students it is a combination of issues that leads to their withdrawal. Only a relatively small number of ex-students had experienced serious life …

Go to article

A Nonparametric Two-Sample Wald Test Of Equality Of Variances, David Allingham, J. C. W Rayner Jan 2011

A Nonparametric Two-Sample Wald Test Of Equality Of Variances, David Allingham, J. C. W Rayner

Faculty of Informatics - Papers (Archive)

We develop a test for equality of variances given two independent random samples of observations. The test can be expected to perform well when both sample sizes are at least moderate and the sample variances are asymptotically equivalent to the maximum likelihood estimators of the population variances. The test is motivated by and is here assessed for the case when both populations sampled are assumed to be normal. Popular choices of test would be the twosample F test if normality can be assumed and Levene’s test if this assumption is dubious. Another competitor is theWald test for the difference in …

Go to article

Coordinated Utilisation Of Wind Farm Reactive Power Capability For System Loss Optimisation, Lasantha Meegahapola, S Durairaj, D Flynn, B Fox Jan 2011

Coordinated Utilisation Of Wind Farm Reactive Power Capability For System Loss Optimisation, Lasantha Meegahapola, S Durairaj, D Flynn, B Fox

Faculty of Informatics - Papers (Archive)

Most wind farms currently being installed are based upon doubly fed induction generator (DFIG) or direct-drive synchronous generator (DDSG) technology. Given that one of the impacts of introducing distributed generation is an alteration of steady-state power flows and voltages, both technologies are capable of providing local voltage support. Wind farms may, therefore, be included in optimal power flow (OPF) calculations to minimise fuel cost and/or network losses. The IEEE 30-bus system is considered as a case study, comparing fixed-speed induction generator (FSIG) requirements with DFIG capability. Results are presented for a range of DFIG capability modes, at varying system load …

Go to article

Towards Peer Selection In A Semantically-Enriched Service Execution Framework With Qos Specifications, Jun Shen, Ghassan Beydoun, Graham Low, Brian Henderson-Sellers, Shuai Yuan Jan 2011

Towards Peer Selection In A Semantically-Enriched Service Execution Framework With Qos Specifications, Jun Shen, Ghassan Beydoun, Graham Low, Brian Henderson-Sellers, Shuai Yuan

Faculty of Informatics - Papers (Archive)

This paper promotes an ontology-based multi agent system (MAS) framework to facilitate Peer-to-Peer (P2P) service selection with multiple service properties. P2P-based service has emerged as an important new field in the distributed computing arena. It focuses on intensive service sharing, innovative applications and compositions, and, in some cases, high performance orientation. However, one of the remaining challenges for the P2P-based service composition process is how to effectively discover and select the most appropriate peers to execute the service applications when considering multiple properties of the requested services. By introducing an ontology, different ontology-based e-service profiles can be proposed to facilitate …

Go to article

Promises And Successful Practice In It Governance: A Survey Of Australian Senior It Managers, Akemi T. Chatfield, Terrence Coleman Jan 2011

Promises And Successful Practice In It Governance: A Survey Of Australian Senior It Managers, Akemi T. Chatfield, Terrence Coleman

Faculty of Informatics - Papers (Archive)

In a global, digital economy, companies increasingly depend on IT for timely information sharing,effective operational control, rapid innovation, speed to market, and customer satisfaction. On theother hand, recent global financial crisis and economic recessions encourage trends for increasedmanagerial scrutiny to reduce IT spending and to increase business value of IT. Globally, concepts ofIT governance (ITG) have proliferated as a solution for improving IT management under businessuncertainty and rapid technological change. However, empirical research on organisational ITGpractice still is lacking and urgently required. This paper, therefore, presents survey results on ITGpractice from a perspective of senior IT managers in Australian private-sector …

Go to article

An Ambient Multimedia User Experience Feedback Framework Based On User Tagging And Eeg Biosignals, Eva Cheng, Stephen J. Davis, Ian Burnett, Christian H. Ritz Jan 2011

An Ambient Multimedia User Experience Feedback Framework Based On User Tagging And Eeg Biosignals, Eva Cheng, Stephen J. Davis, Ian Burnett, Christian H. Ritz

Faculty of Informatics - Papers (Archive)

Multimedia is increasingly accessed online and within social networks; however, users are typically limited to visual/auditory stimulus through media presented onscreen with accompanying audio over speakers. Whilst recent research studying additional ambient sensory multimedia effects recorded numerical scores of perceptual quality, the users’ time-varying emotional response to the ambient sensory feedback is not considered. This paper thus introduces a framework to evaluate user ambient quality of multimedia experience and discover users’ time-varying emotional responses through explicit user tagging and implicit EEG biosignal analysis. In the proposed framework, users interact with the media via discrete tagging activities whilst their EEG biosignal …

Go to article

Self-Matching Bands In The Paperfolding Sequence, Bruce Bates, Martin Bunder, Keith Tognetti Jan 2011

Self-Matching Bands In The Paperfolding Sequence, Bruce Bates, Martin Bunder, Keith Tognetti

Faculty of Informatics - Papers (Archive)

We compare term by term the paperfolding sequence with a copy displaced by d terms to obtain the matching fraction M(d).

Go to article

Sources Of Carbonaceous Aerosols And Deposited Black Carbon In The Arctic In Winter-Spring: Implications For Radiative Forcing, Q Wang, D J. Jacob, J A. Fisher, J Mao, E M. Leibensperger, C C. Carouge, P Le Sager, Y Kondo, J L. Jimenez, M J. Cubison, S J. Doherty Jan 2011

Sources Of Carbonaceous Aerosols And Deposited Black Carbon In The Arctic In Winter-Spring: Implications For Radiative Forcing, Q Wang, D J. Jacob, J A. Fisher, J Mao, E M. Leibensperger, C C. Carouge, P Le Sager, Y Kondo, J L. Jimenez, M J. Cubison, S J. Doherty

Faculty of Science - Papers (Archive)

We use a global chemical transport model (GEOS-Chem CTM) to interpret observations of black carbon (BC) and organic aerosol (OA) from the NASA ARCTAS aircraft campaign over the North American Arctic in April 2008, as well as longer-term records in surface air and in snow (2007-2009). BC emission inventories for North America, Europe, and Asia in the model are tested by comparison with surface air observations over these source regions. Russian open fires were the dominant source of OA in the Arctic troposphere during ARCTAS but we find that BC was of prevailingly anthropogenic (fossil fuel and biofuel) origin, particularly …

Go to article

Analysis Of Macrobenthic Assemblages Of Lake Illawarra, New South Wales, B Li, Robert John Morrison Jan 2011

Analysis Of Macrobenthic Assemblages Of Lake Illawarra, New South Wales, B Li, Robert John Morrison

Faculty of Science - Papers (Archive)

1 - A survey of the macrobenthos community was carried out in Lake Illawarra, NSW, Australia, during April and May 2011. 2 - The aim of this study was to understand the current status of the characteristic macrobenthic fauna community, and the temporal changes over the past 30 years, as well as the impacts of anthropogenic activities on the benthic ecosystem. 3- Fifteen stations were selected as representative of three main areas of the lake (the entrance channel, the central basin and the sublittoral fringe), which might be impacted by different kinds of human activities. 4 - A total of …

Go to article

Sources, Distribution, And Acidity Of Sulfate-Ammonium Aerosol In The Arctic In Winter-Spring, Jenny A. Fisher, Daniel J. Jacob, Q Wang, Roya Bahreini, C C. Carouge, M J. Cubison, Jack E. Dibb, Thomas Diehl, J L. Jimenez, E M. Leibensperger, Zifeng Lu, Marcel B.J Meinders, H. O T. Pye, Patricia K. Quinn, Sangeeta Sharma, David G. Streets, Aaron Van Donkelaar, R M. Yantosca Jan 2011

Sources, Distribution, And Acidity Of Sulfate-Ammonium Aerosol In The Arctic In Winter-Spring, Jenny A. Fisher, Daniel J. Jacob, Q Wang, Roya Bahreini, C C. Carouge, M J. Cubison, Jack E. Dibb, Thomas Diehl, J L. Jimenez, E M. Leibensperger, Zifeng Lu, Marcel B.J Meinders, H. O T. Pye, Patricia K. Quinn, Sangeeta Sharma, David G. Streets, Aaron Van Donkelaar, R M. Yantosca

Faculty of Science - Papers (Archive)

We use GEOS-Chem chemical transport model simulations of sulfate–ammonium aerosol data from the NASA ARCTAS and NOAA ARCPAC aircraft campaigns in the North American Arctic in April 2008, together with longer-term data from surface sites, to better understand aerosol sources in the Arctic in winter–spring and the implications for aerosol acidity. Arctic pollution is dominated by transport from mid-latitudes, and we test the relevant ammonia and sulfur dioxide emission inventories in the model by comparison with wet deposition flux data over the source continents. We find that a complicated mix of natural and anthropogenic sources with different vertical signatures is …

Go to article

Effects Of Aging On Organic Aerosol From Open Biomass Burning Smoke In Aircraft And Laboratory Studies, M J. Cubison, A M. Ortega, P L. Hayes, D K. Farmer, D Day, M J. Lechner, W H. Brune, E Apel, G S. Diskin, J A. Fisher, H E. Fuelberg, A Hecobian, D J. Knapp, T Mikoviny, D Riemer, G W. Sachse, W Sessions, R Weber, A J. Weinheimer, A Wisthaler, J L. Jimenez Jan 2011

Effects Of Aging On Organic Aerosol From Open Biomass Burning Smoke In Aircraft And Laboratory Studies, M J. Cubison, A M. Ortega, P L. Hayes, D K. Farmer, D Day, M J. Lechner, W H. Brune, E Apel, G S. Diskin, J A. Fisher, H E. Fuelberg, A Hecobian, D J. Knapp, T Mikoviny, D Riemer, G W. Sachse, W Sessions, R Weber, A J. Weinheimer, A Wisthaler, J L. Jimenez

Faculty of Science - Papers (Archive)

Biomass burning (BB) is a large source of primary and secondary organic aerosols (POA and SOA). This study addresses the physical and chemical evolution of BB organic aerosols. Firstly, the evolution and lifetime of BB POA and SOA signatures observed with the Aerodyne Aerosol Mass Spectrometer are investigated, focusing on measurements at high-latitudes acquired during the 2008 NASA ARCTAS mission, in comparison to data from other field studies and from laboratory aging experiments. The parameter f60 , the ratio of the integrated signal at m/z 60 to the total signal in the organic component mass spectrum, is used as a …

Go to article

Nanoesi Mass Spectrometry Of Rubisco And Rubisco Activase Structures And Their Interactions With Nucleotides And Sugar Phosphates, Michelle Blayney, Spencer M. Whitney, Jennifer L. Beck Jan 2011

Nanoesi Mass Spectrometry Of Rubisco And Rubisco Activase Structures And Their Interactions With Nucleotides And Sugar Phosphates, Michelle Blayney, Spencer M. Whitney, Jennifer L. Beck

Faculty of Science - Papers (Archive)

Ribulose bisphosphate carboxylase/oxygenase (Rubisco) is the protein that is responsible for the fixation of carbon dioxide in photosynthesis. Inhibitory sugar phosphate molecules, which can include its substrate ribulose-1,5- bisphosphate (RuBP), can bind to Rubisco catalytic sites and inhibit catalysis. These are removed by interaction with Rubisco activase (RA) via an ATP hydrolytic reaction. Here we show the first nanoESI mass spectra of the hexadecameric Rubisco and of RA from a higher plant (tobacco). The spectra of recombinant, purified RA revealed polydispersity in its oligomeric forms (up to hexamer) and that ADP was bound. ADP was removed by dialysis against a …

Go to article

The Influence Of Sediment Particle Size And Organic Carbon On Toxicity Of Copper To Benthic Invertebrates In Oxic/Suboxic Surface Sediments, David Strom, Stuart L. Simpson, Graeme E. Batley, Dianne F. Jolley Jan 2011

The Influence Of Sediment Particle Size And Organic Carbon On Toxicity Of Copper To Benthic Invertebrates In Oxic/Suboxic Surface Sediments, David Strom, Stuart L. Simpson, Graeme E. Batley, Dianne F. Jolley

Faculty of Science - Papers (Archive)

The use of sediment quality guidelines to predict the toxicity of metals in sediments is limited by an inadequate understanding of exposure pathways and by poor causal links between exposure and effects. For a 10-d exposure to Cu-spiked sediments, toxicity to the amphipod Melita plumulosa was demonstrated to occur through a combination of dissolved and dietary Cu exposure pathways, but for the bivalves Spisula trigonella and Tellina deltoidalis, toxicity occurred primarily by exposure to dissolved Cu. For relatively oxidized sediments that had moderate amounts of organic carbon (2.6-8.3% OC), silt (20-100%

Go to article

How Well Do Predators Adjust To Climate-Mediated Shifts In Prey Distribution? A Study On Australian Water Pythons, Beata Ujvari, Rick Shine, Thomas Madsen Jan 2011

How Well Do Predators Adjust To Climate-Mediated Shifts In Prey Distribution? A Study On Australian Water Pythons, Beata Ujvari, Rick Shine, Thomas Madsen

Faculty of Science - Papers (Archive)

Climate change can move the spatial location of resources critical for population viability, and a species resilience to such changes will depend upon its ability to flexibly shift its activities away from no-longer-suitable sites to exploit new opportunities. Intuition suggests that vagile predators should be able to track spatial shifts in prey availability, but our data on water pythons (Liasis fuscus) in tropical Australia suggest a less encouraging scenario. These pythons undergo regular long-range (to .10 km) seasonal migrations to follow flooding-induced migrations by their prey (native dusky rats, Rattus colletti ). However, when an extreme flooding event virtually eliminated …

Go to article

Daily And 3-Hourly Variability In Global Fire Emissions And Consequences For Atmospheric Model Predictions Of Carbon Monoxide, M Mu, James Randerson, G R. Van Der Werf, L Giglio, Prasad Kasibhatla, D Morton, G J. Collatz, R S. Defries, E J. Hyer, E M. Prins, David W. Griffith, Debra Wunch, G C. Toon, V Sherlock, Paul O. Wennberg Jan 2011

Daily And 3-Hourly Variability In Global Fire Emissions And Consequences For Atmospheric Model Predictions Of Carbon Monoxide, M Mu, James Randerson, G R. Van Der Werf, L Giglio, Prasad Kasibhatla, D Morton, G J. Collatz, R S. Defries, E J. Hyer, E M. Prins, David W. Griffith, Debra Wunch, G C. Toon, V Sherlock, Paul O. Wennberg

Faculty of Science - Papers (Archive)

"Attribution of the causes of atmospheric trace gas and aerosol variability often requires the use of high resolution time series of anthropogenic and natural emissions inventories. Here we developed an approach for representing synoptic-and diurnal-scale temporal variability in fire emissions for the Global Fire Emissions Database version 3 (GFED3). We disaggregated monthly GFED3 emissions during 2003-2009 to a daily time step using Moderate Resolution Imaging Spectroradiometer (MODIS)-derived measurements of active fires from Terra and Aqua satellites. In parallel, mean diurnal cycles were constructed from Geostationary Operational Environmental Satellite (GOES) Wildfire Automated Biomass Burning Algorithm (WF_ABBA) active fire observations. Daily variability …

Go to article

Retrieval Of Atmospheric Co2 With Enhanced Accuracy And Precision From Sciamachy: Validation With Fts Measurements And Comparison With Model Results, M Reuter, H Bovensmann, M Buchwitz, Jp Burrows, B Connor, Nicholas M. Deutscher, David W. Griffith, J Heymann, Gretchen Keppel-Aleks, Janina Messerschmidt, Justus Notholt, Christof Petri, J Robinson, O Schneising, V Sherlock, Voltaire A. Velazco, Thorsten Warneke, Paul O. Wennberg, Debra Wunch Jan 2011

Retrieval Of Atmospheric Co2 With Enhanced Accuracy And Precision From Sciamachy: Validation With Fts Measurements And Comparison With Model Results, M Reuter, H Bovensmann, M Buchwitz, Jp Burrows, B Connor, Nicholas M. Deutscher, David W. Griffith, J Heymann, Gretchen Keppel-Aleks, Janina Messerschmidt, Justus Notholt, Christof Petri, J Robinson, O Schneising, V Sherlock, Voltaire A. Velazco, Thorsten Warneke, Paul O. Wennberg, Debra Wunch

Faculty of Science - Papers (Archive)

The Bremen Optimal Estimation differential optical absorption spectroscopy (DOAS) (BESD) algorithm for satellite based retrievals of XCO 2 (the column-average dry-air mole fraction of atmospheric CO 2) has been applied to Scanning Imaging Absorption Spectrometer for Atmospheric Cartography (SCIAMACHY) data. It uses measurements in the O 2-A absorption band to correct for scattering of undetected clouds and aerosols. Comparisons with precise and accurate ground-based Fourier transform spectrometer (FTS) measurements at four Total Carbon Column Observing Network (TCCON) sites have been used to quantify the quality of the new SCIAMACHY XCO 2 data set. Additionally, the results have been compared to …

Go to article

The Age Of The 20 Meter Solo River Terrace, Java, Indonesia And The Survival Of Homo Erectus In Asia, Etty Indriati, Carl C. Swisher, Christopher Lepre, Rhonda L. Quinn, Rusyad A. Suriyanto, Agus T. Hascaryo, Rainer Grun, Craig S. Feibel, Briana L. Pobiner, Maxime Aubert, Wendy Lees, Susan C. Anton Jan 2011

The Age Of The 20 Meter Solo River Terrace, Java, Indonesia And The Survival Of Homo Erectus In Asia, Etty Indriati, Carl C. Swisher, Christopher Lepre, Rhonda L. Quinn, Rusyad A. Suriyanto, Agus T. Hascaryo, Rainer Grun, Craig S. Feibel, Briana L. Pobiner, Maxime Aubert, Wendy Lees, Susan C. Anton

Faculty of Science - Papers (Archive)

Homo erectus was the first human lineage to disperse widely throughout the Old World, the only hominin in Asia through much of the Pleistocene, and was likely ancestral to H. sapiens. The demise of this taxon remains obscure because of uncertainties regarding the geological age of its youngest populations. In 1996, some of us co-published electron spin resonance (ESR) and uranium series (U-series) results indicating an age as young as 35-50 ka for the late H. erectus sites of Ngandong and Sambungmacan and the faunal site of Jigar (Indonesia). If correct, these ages favor an African origin for recent humans …

Go to article

The Dirt On Assessing Post-Fire Erosion In The Mount Lofty Ranges: Comparing Methods, Rowena H. Morris, Solomon Buckman, Paul Connelly, Deirdre Dragovich, Bertram Ostendorf, Ross A. Bradstock Jan 2011

The Dirt On Assessing Post-Fire Erosion In The Mount Lofty Ranges: Comparing Methods, Rowena H. Morris, Solomon Buckman, Paul Connelly, Deirdre Dragovich, Bertram Ostendorf, Ross A. Bradstock

Faculty of Science - Papers (Archive)

Land managers are required to assess a range of environmental attributes prior to and after prescribed burning. Current environmental assessments vary depending on the organisation involved and the existing information about localised soil erosion. Auditing successful environmental assessments requires ongoing field monitoring to evaluate whether the magnitude and extent of predicted post-fire impacts are comparable. The impacts of post-fire erosion were assessed by the authors using the techniques of water sampling, sediment traps, erosion pins, laser scanning, photogrammetry and visual field assessment. Each data collecting method varies in its spatial and temporal reach in terms of monitoring landscape changes in …

Go to article

Revealing Indigenous Indonesian Traditional Medicine: Anti-Infective Agents, Paul A. Keller, Ari Satia Nugraha Jan 2011

Revealing Indigenous Indonesian Traditional Medicine: Anti-Infective Agents, Paul A. Keller, Ari Satia Nugraha

Faculty of Science - Papers (Archive)

Indonesia is rich in medicinal plants which the population has used traditionally from generation to generation for curing diseases. Our interest in the treatment of infectious diseases has lead to the investigation of traditional Indonesian treatments. In this review, we present a comprehensive review of ethnopharmacologically directed screening in Indonesian medicinal plants to search for new anti-viral, antimalarial, anti-bacterial and anti-fungal agents. Some potent drug leads have been isolated from Indonesian medicinal plants. Further research is still required for the lead development as well as the search for new bioactive compounds from the enormous medicinal plant resources.

Go to article

Isolation Of Linobiflavonoid, A Novel Biflavonoid From Linostoma Pauciflorum Griff, Tawesin Navarat, Stephen G. Pyne, Uma Prawat, Pittaya Tuntiwachwuttikul Jan 2011

Isolation Of Linobiflavonoid, A Novel Biflavonoid From Linostoma Pauciflorum Griff, Tawesin Navarat, Stephen G. Pyne, Uma Prawat, Pittaya Tuntiwachwuttikul

Faculty of Science - Papers (Archive)

A novel biflavonoid, that we have named linobiflavonoid, and the known biscoumarin ether, daphnoretin, were isolated from the root extracts of Linostoma pauciflorum Griff. The structure of linobiflavonoid was determined from interpretation of its NMR spectroscopic data and from a comparison of this data with those of known biflavonoids and biflavones. The known flavones, 5,4'-dihydroxy- 7,3',5'-trimethoxyflavone and 5,4'-dihydroxy-7-methoxyflavone along with stigmasterol were isolated from the vines of the same plant. 4'-Dihydroxy-7,3'-5'-trimethoxyflavone was active against Mycobacterium tuberculosis (MIC 3.13 mu M) and KB-oral cavity cancer (IC50 17.41 mu M). (C) 2011 Phytochemical Society of Europe. Published by Elsevier B.V. All …

Go to article

Identification Of Phospholipids In Human Meibum By Nano-Electrospray Ionisation Tandem Mass Spectrometry, Jennifer T. Saville, Zhenjun Zhao, Mark Dp Willcox, Manjula A. Ariyavidana, Stephen J. Blanksby, Todd W. Mitchell Jan 2011

Identification Of Phospholipids In Human Meibum By Nano-Electrospray Ionisation Tandem Mass Spectrometry, Jennifer T. Saville, Zhenjun Zhao, Mark Dp Willcox, Manjula A. Ariyavidana, Stephen J. Blanksby, Todd W. Mitchell

Faculty of Science - Papers (Archive)

Meibum is believed to be the major source of tear !lm lipids, which are vital in the prevention of excessevaporation of the aqueous phase. The complete lipid composition of meibum has yet to be established.While earlier studies reported the presence of phospholipids in human meibum, recent mass spectrometricstudies have not detected them. In this study we use electrospray ionisation tandem massspectrometry to investigate the presence of phospholipids in meibum and provide comparison to thephospholipid pro!le of tears.Lipids were extracted from human meibum and tear samples using standard biphasic methods andanalysed by nano-electrospray ionisation tandem mass spectrometry using targeted ion scans. …

Go to article

Global Co(2) Fluxes Inferred From Surface Air-Sample Measurements And From Tccon Retrievals Of The Co(2) Total Column, Frederic Chevallier, Nicholas M. Deutscher, T J. Conway, P Ciais, L Ciattaglia, S Dohe, M Frohlich, A J. Gomez-Pelaez, David W. Griffith, F Hase, L Haszpra, Paul Krummel, E Kyro, C Labuschagne, R Lagenfelds, T Machidda, F Maignan, H Matsueda, I Morino, Justus Notholt, M Ramonet, Y Sawa, M Schmidt, V Sherlock, P Steele, K Strong, R Sussmann, Paul O. Wennberg, Steven C. Wofsy, D Worthy, Debra Wunch, M Zimnoch Jan 2011

Global Co(2) Fluxes Inferred From Surface Air-Sample Measurements And From Tccon Retrievals Of The Co(2) Total Column, Frederic Chevallier, Nicholas M. Deutscher, T J. Conway, P Ciais, L Ciattaglia, S Dohe, M Frohlich, A J. Gomez-Pelaez, David W. Griffith, F Hase, L Haszpra, Paul Krummel, E Kyro, C Labuschagne, R Lagenfelds, T Machidda, F Maignan, H Matsueda, I Morino, Justus Notholt, M Ramonet, Y Sawa, M Schmidt, V Sherlock, P Steele, K Strong, R Sussmann, Paul O. Wennberg, Steven C. Wofsy, D Worthy, Debra Wunch, M Zimnoch

Faculty of Science - Papers (Archive)

"We present the first estimate of the global distribution of CO(2) surface fluxes from 14 stations of the Total Carbon Column Observing Network (TCCON). The evaluation of this inversion is based on 1) comparison with the fluxes from a classical inversion of surface air-sample-measurements, and 2) comparison of CO(2) mixing ratios calculated from the inverted fluxes with independent aircraft measurements made during the two years analyzed here, 2009 and 2010. The former test shows similar seasonal cycles in the northern hemisphere and consistent regional carbon budgets between inversions from the two datasets, even though the TCCON inversion appears to be …

Go to article

Envisioning The Archipelago, Elizabeth Mcmahon, Carol Farbotko, Godfrey Baldacchino, Andrew Harwood, Elaine Stratford Jan 2011

Envisioning The Archipelago, Elizabeth Mcmahon, Carol Farbotko, Godfrey Baldacchino, Andrew Harwood, Elaine Stratford

Faculty of Science - Papers (Archive)

Certain limitations arise from the persistent consideration of two common relationsof islands in the humanities and social sciences: land and sea, and island andcontinent/mainland. What remains largely absent or silent are ways of being, knowing anddoing¿ontologies, epistemologies and methods¿that illuminate island spaces as inter-related,mutually constituted and co-constructed: as island and island. Therefore, this paper seeks tomap out and justify a research agenda proposing a robust and comprehensive exploration ofthis third and comparatively neglected nexus of relations. In advancing these aims, the paper¿sgoal is to (re)inscribe the theoretical, metaphorical, real and empirical power and potential ofthe archipelago: of seas studded with …

Go to article

Synthesis Of 3-Halo-2,5-Disubstituted Furans Via Cux Mediated Cyclization-Halogenation Reactions, Arife Yazici, Stephen G. Pyne Jan 2011

Synthesis Of 3-Halo-2,5-Disubstituted Furans Via Cux Mediated Cyclization-Halogenation Reactions, Arife Yazici, Stephen G. Pyne

Faculty of Science - Papers (Archive)

The Cu(I) halide (X = I, Br, Cl) mediated reactions of Cbz-protected cis-2-phenylethenyl-3-hydroxypyrrolidine gave novel 3-halo-2,5-trisubstituted furans in good yields, via a cyclization-halogenation, ring-opening reaction sequence. In contrast, the reactions with CuCN gave mainly the corresponding 3-cyanofuro[3,2-b]pyrrole formed from a cyclization-cyanation reaction.

Go to article

An Unusually Flexible Expanded Hexaamine Cage And Its Cuii Complexes: Variable Coordination Modes And Incomplete Encapsulation, C-J Qin, Lloyd James, Jy D. Chartres, Leighton J. Alcock, Kimberley J. Davis, Anthony C. Willis, Alan M. Sargeson, Paul V. Bernhardt, Stephen F. Ralph Jan 2011

An Unusually Flexible Expanded Hexaamine Cage And Its Cuii Complexes: Variable Coordination Modes And Incomplete Encapsulation, C-J Qin, Lloyd James, Jy D. Chartres, Leighton J. Alcock, Kimberley J. Davis, Anthony C. Willis, Alan M. Sargeson, Paul V. Bernhardt, Stephen F. Ralph

Faculty of Science - Papers (Archive)

The bicyclic hexaamine "cage" ligand Me 8tricosaneN 6 (1,5,5,9,13,13,20,20-octamethyl-3,7,11,15,18, 22-hexaazabicyclo[7.7.7]tricosane) is capable of encapsulating octahedral metal ions, yet its expanded cavity allows the complexed metal to adopt a variety of geometries comprising either hexadentate or pentadentate coordination of the ligand. When complexed to Cu II the lability of the metal results in a dynamic equilibrium in solution between hexadentate- and pentadentate- coordinated complexes of Me 8tricosaneN 6. Both [Cu(Me 8tricosaneN 6)](ClO 4) 2 (6-coordinate) and [Cu(Me 8tricosaneN 6)](S 2O 6) (5-coordinate) have been characterized structurally. In weak acid (pH 1) a singly protonated complex [Cu(HMe 8tricosaneN 6)] 3+ has been …

Go to article

Preliminary Validation Of Column-Averaged Volume Mixing Ratios Of Carbon Dioxide And Methane Retrieved From Gosat Short-Wavelength Infrared Spectra, David W. Griffith, G C. Toon, B Connor, R Sussmann, Thorsten Warneke, Nicholas M. Deutscher, Paul O. Wennberg, Justus Notholt, V Sherlock, J Robinson, O Uchino, C M. Roehl, I Morino, Debra Wunch, Janina Messerschmidt, Y Yoshida, M Inoue, M Rettinger Jan 2011

Preliminary Validation Of Column-Averaged Volume Mixing Ratios Of Carbon Dioxide And Methane Retrieved From Gosat Short-Wavelength Infrared Spectra, David W. Griffith, G C. Toon, B Connor, R Sussmann, Thorsten Warneke, Nicholas M. Deutscher, Paul O. Wennberg, Justus Notholt, V Sherlock, J Robinson, O Uchino, C M. Roehl, I Morino, Debra Wunch, Janina Messerschmidt, Y Yoshida, M Inoue, M Rettinger

Faculty of Science - Papers (Archive)

Column-averaged volume mixing ratios of carbon dioxide and methane retrieved from the Greenhouse gases Observing SATellite (GOSAT) Short-Wavelength InfraRed observation (GOSAT SWIR XCO2 and XCH4 ) were compared with the reference calibrated data obtained by ground-based high-resolution Fourier Transform Spectrometers (g-b FTSs) participating in the Total Carbon Column Observing Network (TCCON). Preliminary results are as follows: the GOSAT SWIR XCO2 and XCH4 (Version 01.xx) are biased low by 8.85 ±4.75 ppm (2.3±1.2 %) and 20.4±18.9 ppb (1.2±1.1 %), respectively. The standard deviation of the GOSAT SWIR XCO2 and XCH4 is about 1% after correcting the negative biases of XCO2 and …

Go to article

An Assessment Of Three Harpacticoid Copepod Species For Use In Ecotoxicological Testing, Daniel J. Ward, Victor Perez-Landa, David A. Spadaro, Stuart L. Simpson, Dianne F. Jolley Jan 2011

An Assessment Of Three Harpacticoid Copepod Species For Use In Ecotoxicological Testing, Daniel J. Ward, Victor Perez-Landa, David A. Spadaro, Stuart L. Simpson, Dianne F. Jolley

Faculty of Science - Papers (Archive)

The relatively short life cycles of harpacticoid copepods makes them appropriate animals for use in tests that rapidly assess the #180, sublethal, or chronic effects of sediment contaminants. In this study, four harpacticoid copepod species (Nitocra spinipes, Tisbe tenuimana, Robertgurneya hopkinsi, and Halectinosoma sp.) were isolated from clean marine sediments, and procedures for laboratory culturing were developed. Halectinosoma sp. was abandoned due to handling difficulties. For the remaining species, the influence of food type and quantity on life-cycle progression was assessed. A mixed diet, comprising two species of algae (Tetraselmis sp. and Isochrysis sp.) and fish food (Sera …

Go to article

Extensional And Colisional Magmatic Records In The Apiai Terrane, South-Southeastern Brazil: Integration Of Geochronological U-Pb Zircon Ages, Oswaldo Siga Junior, Miguel Angelo Stipp Basei, Allen P. Nutman, Kei Sato, Ian Mcreath, Claudia Regina Passarelli, Dunyi Liu Jan 2011

Extensional And Colisional Magmatic Records In The Apiai Terrane, South-Southeastern Brazil: Integration Of Geochronological U-Pb Zircon Ages, Oswaldo Siga Junior, Miguel Angelo Stipp Basei, Allen P. Nutman, Kei Sato, Ian Mcreath, Claudia Regina Passarelli, Dunyi Liu

Faculty of Science - Papers (Archive)

The aim of this work is the presentation of a synthesis of available geochronological data for the basement inliers and metavolcano-sedimentary sequences which occur in the southern part of the Apiai Terrane, south-southeastern Brazil. These data, especially those obtained during the last decade, have made substantial modifi cations to the tectonic scenario of south-southeastern Brazil with the recognition of the presence of extensional basins (continental rifts) with magmatism and sedimentation at the late Paleoproterozoic (1790 - 1750 Ma) and of the Mesoproterozoic (1600 - 1450 Ma). These processes started at the late Paleoproterozoic in the Betara, Perau and Apiai Mirim …

Go to article

An Automated Land Subdivision Tool For Urban And Regional Planning: Concepts, Implementation And Testing, Rohan Wickramasuriya, Laurie A. Chisholm, Marjetta Puotinen, Nicholas Gill, Peter Klepeis Jan 2011

An Automated Land Subdivision Tool For Urban And Regional Planning: Concepts, Implementation And Testing, Rohan Wickramasuriya, Laurie A. Chisholm, Marjetta Puotinen, Nicholas Gill, Peter Klepeis

Faculty of Science - Papers (Archive)

Simulation of the land subdivision process is useful in many applied and research areas. Planners use such tools to understand potential impacts of planning regulations prior to their implementation. While the credibility of both land-use change and urban growth models would be enhanced by integrating capabilities to simulate land subdivision, such research is lacking in the published literature. Of the few subdivision tools that exist, most are either not fully-automated or are unable to generate realistic subdivision layouts. This limits their applicability, particularly for high resolution land-use change models. In this paper, we present a fully-automated land subdivision tool that …

Go to article

Films, Buckypapers And Fibers From Clay, Chitosan And Carbon Nanotubes, Thomas M. Higgins, Holly Warren, Marc In Het Panhuis Jan 2011

Films, Buckypapers And Fibers From Clay, Chitosan And Carbon Nanotubes, Thomas M. Higgins, Holly Warren, Marc In Het Panhuis

Faculty of Science - Papers (Archive)

The mechanical and electrical characteristics of films, buckypapers and fiber materials from combinations of clay, carbon nanotubes (CNTs) and chitosan are described. The rheological time-dependent characteristics of clay are maintained in clay–carbon nanotube–chitosan composite dispersions. It is demonstrated that the addition of chitosan improves their mechanical characteristics, but decreases electrical conductivity by three-orders of magnitude compared to clay–CNT materials. We show that the electrical response upon exposure to humid atmosphere is influenced by clay-chitosan interactions, i.e., the resistance of clay–CNT materials decreases, whereas that of clay–CNT–chitosan increases.

Go to article

First Prev Next Last