Dr Walter Kalceff

Armstrong, N.G., Kalceff, W., Cline, J.P. & Bonevich, J.E. 2004, 'A Bayesian/Maximum Entropy Method for Certification of a Nanocrystalline-Size NIST Reference Material' in Mittemeijer EJ; Scardi P (eds), Diffraction Analysis of the Microstructure of Materials, Springer Verlag, Berlin, Germany, pp. 187-227.
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Stevens-Kalceff, M.A., Phillips, M.R., Moon, A.R. & Kalceff, W. 2000, 'Cathodoluminescence Microcharacterisation of Silicon Dioxide Polymorphs' in Pagel M; Barbin V; Blanc P; Ohnenstetter D (eds), Cathodoluminescence in Geosciences, Springer-Verlag, Berlin, Germany, pp. 193-224.

De Souza, J., Freire, P., Argyriou, D.N., Stride, J., Barthes, M., Kalceff, W. & Bordallo, H.N. 2009, 'Raman And Neutron Scattering Study Of Partially Deuterated L-Alanine: Evidence Of A Solid-Solid Phase Transition', Chemphyschem, vol. 10, no. 18, pp. 3337-3343.
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Raman and neutron experiments using specific isotope labeling were combined in order to study the dynamics and structure Of L-alanine. Inelastic neutron and Raman scattering data of C2H4(ND2)CO2D are discussed in relation to the doubling of the lattice p

Stevens-Kalceff, M.A., Prawer, S., Kalceff, W., Orwa, J.O., Peng, J.L., McCallum, J.C. & Jamieson, D.N. 2008, 'Cathodoluminescence microanalysis of diamond nanocrystals in fused silicon dioxide', Journal of Applied Physics, vol. 104, no. 11, pp. 113514-1-113514-9.
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MeV carbon ion implantation followed by thermal annealing in a hydrogen-containing atmosphere produces a layer of diamond nanocrystals within fused quartz (SiO2). Cathodoluminescence (CL) microanalysis in a scanning electron microscope has revealed at least three previously unreported low intensity CL emissions from carbon implanted and thermally annealed fused SiO2. The CL emissions are observed at 2.78 eV [full width at half maximum (FWHM) of 0.08 eV], ~3 eV (FWHM of 0.4 eV), and 3.18 eV (FWHM of 0.11 eV). The peak widths and energies of these emissions are incompatible with any known defects associated with the silicon dioxide host lattice. Nondestructive depth resolved CL microanalysis investigations confirm that these CL emissions originate from the near-surface region, consistent with their association with the layer of diamond nanocrystals

Bordallo, H.N., Argyriou, D.N., Barthes, M., Kalceff, W., Rols, S., Herwig, K., Fehr, C., Juranyi, F. & Seydel, T. 2007, 'Hydrogen in N-methylacetamide Positions and dynamics of the hydrogen atoms using neutron scattering', Journal Of Physical Chemistry B, vol. 111, no. 27, pp. 7725-7734.
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This work reports neutron diffraction and incoherent neutron scattering experiments on N-methylacetamide (NMA), which can be considered the model building block for the peptide linkage of polypeptides and proteins. Using the neutron data, we have been able to associate the onset of a striking negative thermal expansion (NTE) along the a-axis with a dynamincal transition around 230K, consistent with our calorimetric experiments. Observation of the NTE raises the questions of possible proton transfer in NMA, which from our data alone wtill cannot be settled. We can only speculate that intermolecular repulsive forces increases as the O...H distance decreases upon cooling, and that around 230K the lattice relaxes wothout observation of an actual proton transfer. However, the existence ofa nonharmonic potential reflected by the behaviour of the phonon vibrations together with the observation of NTE, could be justified by the vibrational polaron theory in which a dynamic localization of the vibrational energy is created by coupling an internal molecular mode to a lattice phonon. More generally this work shows that neutron powder diffraction techniques can be very powerful for investigating structural deformations in small peptide systems.

Kirkup, L., Kalceff, W. & McCredie, G.M. 2007, 'Effect Of Injection Current On The Repeatability Of Laser Diode Junction Voltage-temperature Measurements', Journal Of Applied Physics, vol. 101, no. 2, pp. 1-6.
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The junction-voltage temperature relationship of a laser diode is used to determine the temperature of the device in the range -20 to 120 degrees C. We consider changes that occur to this relationship when the diode is driven at its nominal operating cur

Kirkup, L., Kalceff, W. & McCredie, G.M. 2006, 'System for measuring the junction temperature of a light emitting diode immersed in liquid nitrogen', Review Of Scientific Instruments, vol. 77, no. 4, pp. 1-3.
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A versatile system has been developed for the measurement under LABVIEW (TM) control of junction temperatures in a light emitting diode (LED). Measurements are reported on a commercially available high-intensity InGaAlP LED immersed in liquid nitrogen an

Solina, D.M., Cheary, R.W., Kalceff, W. & McCredie, G.M. 2005, 'X-ray reflectivity study of radio frequency sputtered silicon oxide on silicon', Thin Solid Films, vol. 489, no. 1-2, pp. 37-41.
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An X-ray reflectivity study carried out on 45-450 angstrom films of radio frequency sputtered silicon oxide on silicon, with particular attention given to the interface between film and substrate. In order to model refectivity data it was necessary to in

Armstrong, N.G., Kalceff, W., Cline, J.P. & Bonevich, J.E. 2004, 'Bayesian inference of nanoparticles-broadened X-ray line profiles', Journal of Research of the National Institute of Standards and Technology, vol. 109, no. 1, pp. 155-178.
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Suanpang, P., Petocz, P. & Kalceff, W. 2004, 'Student attitudes to learning business statistics: Comparison of online and traditional methods', Educational Technology & Society, vol. 7, no. 3, pp. 9-20.
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A brief narrative description of the journal article, document, or resource. Worldwide, electronic learning (E-learning) has become an important part of the education agenda in the last decade. The Suan Dusit Rajabhat University (SDRU), Thailand has made significant efforts recently to use Internet technologies to enhance learning opportunities. The results reported here are part of a pioneering study to determine the effectiveness of a new online learning course in the subject "Business Statistics". This paper compares two groups of students, one studying using a traditional lecture-based approach, and the other studying using e-learning. The comparison is based on students' attitudes towards statistics measured using a validated questionnaire, both before and after the 16-week course, and for each of the modes of study. Comparisons are also made with students studying by distance, although the numbers in these groups are too small for sensible statistical analysis. The questionnaire data are augmented by material from interviews and other student reports of their experience. The results showed highly significant differences in attitudes towards statistics between the students studying online and the students using a traditional approach.

Bordallo, H.N., Kolesnikov, A.I., Kolomiets, A.V., Kalceff, W., Nakotte, H. & Eckert, J. 2003, 'Inelastic neutron scattering studies of TbNiALH(1.4) and UNiAlH2.0 hydrides', Journal of Physics: Condensed Matter, vol. 15, no. 17, pp. 2551-2559.
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The optical vibrations of hydrogen in TbNiAlH1.4 and UNiAlH2.0 were investigated by means of inelastic neutron scattering. The experimental data were analysed, including multiphonon neutron scattering contributions, calculated in an isotropic harmonic approximation. At least two fundamental H optical peaks were observed in TbNiAlH1.4, and were assigned to the vibrational modes of hydrogen atoms occupying different interstitial sites in the metal sublattice. The high-energy part of the UNiAlH2.0 spectra is characterized by strong anharmonicity, and a broad fundamental band. The latter can be accounted for by a large dispersion of phonon modes due to the strong H+H interactions, and/or different metal+hydrogen force constants, which may originate from different metal atoms surrounding the H atoms in the unit cell.

Kirkup, L., Kalceff, W. & McCredie, G.M. 1992, 'System For The Study Of Localized Heating At Current Contacts On Ceramic Superconductors', Measurement Science & Technology, vol. 3, no. 12, pp. 1141-1145.
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We present a versatile and sensitive system used to quantify the heating effect when pulsed and ramped transport currents are supplied to contacts made to high-T(c) superconductors. Measurements made with the system reveal that modest currents (of the or

Kirkup, L., Kalceff, W. & Stockton, G. 1992, 'Wide Dynamic-range Current-voltage Characterization System For Ceramic Superconductors', Review Of Scientific Instruments, vol. 63, no. 3, pp. 2044-2047.
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Transport current-voltage (I-V) characteristics gathered over several orders of magnitude of current can reveal much about the loss mechanisms in high T(c) superconductors. This article describes the design and implementation of a novel, computer-control

Armstrong, N.G., Dowd, A.R., Cline, J.P. & Kalceff, W. 2005, 'Bayesian analysis of ceria nanoparticles from line profile data', Denver X-Ray Conference, Steamboat Springs, USA, June 2005 in Advances in X-ray analysis - Volume 48, ed Huang, T.C., International Centre for Diffraction Data, Pennsylvania, USA, pp. 59-66.
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A Bayesian/Maximum entropy (MaxEnt) emthod is applied to quantify the broadening of X-ray line profiles in terms of the nanocrystallite size effects in ceria. The analysis is in general agreemetn with transmission electron microscopy results, while demonstrating the importance of appropriate a priori information needed in the method. The analysis also identifies other microstructural effects, such as the presence of dislocations and shape anisotropic effects which may be influencing the size distributions determined from the Bayesian/Max-Ent method.

Armstrong, N.G., Kalceff, W., Cline, J.P., Bonevich, J.E., Lynch, P.A., Tang, C.C., Thompson, S.P. 2004, 'X-ray diffraction characterisation of nanoparticles size and shape distributions: application to bimodal distributions', Wagga Wagga annual condense matter and material meeting, Wagga Wagga, Australia, February 2004 in Proceedings of the 28th Annual Condensed Matter and Material Meeting, ed Savvides, N., Australian Institute of Physics Publications, Sydney, pp. 1-3.
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