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Browsing Conference Publications by Subject "SAIP Conference 2010"

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Aerodynamics in arbitrarily accelerating frames: application to high-g turns

Author: Gledhill, Irvy MA ; Nordström, J Date: Sep 2010 Fifth-generation missiles accelerate up to 100 g in turns, and higher accelerations are expected as agility increases. The auhtors have developed the theory of aerodynamics for arbitrary accelerations, and have validated modelling in a ... Read more
Aerodynamics in arbitrarily accelerating frames: application to high-g turns

Author: Gledhill, Irvy MA ; Nordstrom, J Date: Sep 2010 Fifth-generation missilies accelerate up to 100 g in turns, and higher accelerations are expected as agility increases. The authors have developed the theory of aerodynamics for arbitrary accelerations, and have validated modelling in a ... Read more
Affects of binary and continuous phase modulations on the structure of Bessel beams

Author: Dudley, Angela L ; Vasilyeu, R ; Belyi, V ; Khilo, N ; Ropot, P ; Forbes, A Date: Sep 2010 The authors implement a novel technique to operate a phase-only spatial light modulator (SLM) in amplitude mode, allowing them to reproduce Durnin’s ring slit on a liquid crystal display (LCD). The affects of binary and continuous phase ... Read more
Amplitude damping of vortex modes

Author: Dudley, Angela L ; Nock, M ; Konrad, T ; Roux, F ; Forbes, A Date: Sep 2010 An interferometer, mimicking an amplitude damping channel for vortex modes, is presented. Experimentally the action of the channel is in good agreement with that predicted theoretically. Since we can characterize the action of the channel on ... Read more
Carbon nanotube/nickel oxide nanocomposite thin films for selective solar absorber

Author: Roro, Kittessa T ; Mwakikunga, Bonex W ; Forbes, A ; Tile, N ; Yalisi, B Date: Sep 2010 Multi-walled carbon nanotube (MWCNT)/Nickel oxide nanocomposites were prepared on aluminum substrates for selective solar absorber applications. MWCNTs are functionalized in order to disperse in water and ethanol. Results from the characterization ... Read more
Decoherence of superposition states in trapped ions

Author: Uys, H ; Biercuk, M ; Van Devender, AP ; Ospelkaus, C ; Meiser, D ; Ozeri, R ; Bollinger, JJ Date: Sep 2010 This paper investigates the decoherence of superpositions of hyperfine states of 9Be+ ions due to spontaneous scattering of off-resonant light. It was found that, contrary to conventional wisdom, elastic Raleigh scattering can have major ... Read more
Demonstration of a hybrid Ho:YLF Ho:LuLF slab laser

Author: Esser, MJD ; Collett, O ; Bollig, C Date: Oct 2010 The authors present a continuous-wave slab laser utilising both Ho:YLF and Ho:LuLF as laser gain media. 30 W of output power at 2 µm was demonstrated in a stable concave-plane resonator while 13 W was achieved in a hybrid stable-unstable ... Read more
Detecting yocto (10-24) newton forces with trapped ions

Author: Uys, H ; Biercuk, M ; Britton, JW ; Van Devender, AP ; Bollinger, JJ Date: Sep 2010 This article reports on a calibrated measurement of 174 Yoctonewton using a cloud of 60 9 Be+ ion confined in a Penning ion trap. These measurements suggest that ion traps may form the basis of a new class of ultrasensitive deployable force sensors. Read more
Detection of forbidden Singlet-Triplet Transitions of 12C16O

Author: Steenkamp, CM ; Dickenson, GD ; Nortje, AC ; Rohwer, EG ; Du Plessis, A Date: Sep 2010 Twenty rovibronic transitions of the e(v'=5)-X(v''=0) band of the 12C16O which experimental wavelengths were previously unavailable were recently detected by vr induced fluorescence excitation spectroscopy. The data is important in astrophysical ... Read more
Development of a high power femtosecond laser

Author: Neethling, PH ; Rohwer, EG ; Schwoerer, H ; Botha, L Date: Oct 2010 The Laser Research Institute and the CSIR National Laser Centre are developing a high power femtosecond laser system in a joint project with a phased approach. The laser system consists of an fs oscillator and a regenerative amplifier. An ... Read more
Effect of different diode laser powers in photodynamic therapy

Author: Maduray, K ; Karsten, A ; Odhav, B ; Nyokong, T Date: Sep 2010 This preliminary photodynamic therapy study investigated the effect of different diode laser powers (mW) for the activation of two photosensitizers (AlTSPc, aluminum tetrasulfonatedphthalocyanine and ZnTSPc, zinc tetrasulfonatedphthalocyanine) ... Read more
Evolution of the optical vortex density in phase corrected speckle fields

Author: Roux, FS ; Chen, M Date: Sep 2010 In an attempt to understand the process whereby the phase modulation due to atmospheric turbulance causes phase singularities (also called optical vortices), the authors investigated the effect of phase perturbations in speckle beams. They ... Read more
High-power diode-end-pumped Tm:YLF slab laser delivering 189 W at 1890 nm

Author: Koen, W ; Strauss, Hencharl J ; Bollig, C ; Esser, MJD Date: Sep 2010 The authors present a high-power Tm:YLF slab laser double-end-pumped by two 300 W laser diode stacks. The resonator was designed such that the laser emitted at 1890 nm instead of the conventional operating wavelength of 1912 nm. At full ... Read more
Laser-induced breakdown spectroscopy for quantification of heavy metals in soils and sediments

Author: Ambushe, AA ; Du Plessis, A ; McCrindle, RI Date: Sep 2010 Laser-induced breakdown spectroscopy (LIBS) will be used to determine the contents of heavy metals in soils and sediments. LIBS results will be compared with the results obtained by inductively coupled plasma-optical emission spectrometry ... Read more
Measurements of boat motion in waves at Durban harbour for qualitative validation of motion model

Author: Mosikare, OR ; Theron, NJ ; Van de Molen, W Date: Sep 2010 The Response Amplitude Operator (RAO) theory was used to develop a mathematical model of boat angular motion. Measurements were made on a harbour patrol boat on sea runs off Durban Harbour. Measurements were first calibrated for axis alignment ... Read more
Multi-pass 1.9 um Tm:YLF slab laser pump source

Author: Strauss, Hencharl J ; Burd, SC ; Koen, W ; Esser, MJD ; Jacobs, Cobus ; Collett, OJP ; Nyangaza, K ; Preussler, D ; Bollig, C Date: Sep 2010 A novel multi-pass Tm: YLF laser was demonstrated with an improvement in efficiency, footprint and cost over a two diode stack pumped, single pass system. 100 W of output power from 261 W of incident diode pump power with a slope efficiency ... Read more
Photo-transfection and selective optical differentiation of embryonic stem cells

Author: Mthunzi-Kufa, Patience ; Gunn-Moore, F ; Dholakia, K Date: Sep 2010 Due to their self-renewal and pluripotency characteristics, stem cells possess the potential to dramatically advance current therapies in tissue regeneration and engineering. In this work, we report for the first time that femtosecond laser ... Read more
Porphyrin nanorods characterisation for an artificial light harvesting and energy transfer system

Author: Mongwaketsi, N ; Sparrow, R ; Klumperman, B ; Maaza, M Date: Jan 2010 Understanding growth mechanism of porphyrins nanorods by self assembly and molecular recognition is essential for their successful implementation in nanodevices. Optical spectroscopy and FTIR were used to investigate growth mechanism immediatelay ... Read more
Prolonging coherence in trapped ions

Author: Uys, H ; Biercuk, M ; Van Devender, AP ; Bollinger, JJ Date: Sep 2010 The authors study pulse sequences that dynamically decouple 9Be+ ions from their decohering environment. The noise environment the ions see is artificially synthesized to emulate a variety of physical systems. By incorporating measurement ... Read more
Pulse shaping and characterization with a 4f system

Author: Botha, N ; Botha, L ; Du Plessis, A ; Uys, H ; Schoewer, H Date: Oct 2010 The design of the pulse shaping setup as well as factors taken into account in choosing a specific setup will be discussed. We investigate the generation of simple shaped pulses to test our pulse shaper setup. Difference frequency mixing is ... Read more

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