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Now showing items 5363-5382 of 5732

Ultra-fast science at the CSIR:NLC

Author: Botha, L ; Du Plessis, A ; Strydom, C Date: May 2008 Ultra-fast science at the South African National Laser Center Read more
Ultra-thin reinforced concrete pavements (UTRCP): Addressing the design issues

Author: Du Plessis, L ; Kilian, A ; Mngaza, K Date: Jul 2014 The design and use of ultra-thin reinforced concrete pavements (UTRCP) are well known and are implemented successfully in residential streets and low-volume roads. Various publications are available to assist engineers and contractors to ... Read more
Ultrafast pump-probe spectroscopy of Zinc Phthalocynine (ZnPc) and light harvesting complex II (LHC II)

Author: Ombinda-Lemboumba, Saturnin ; Du Plessis, A ; Botha, L ; Roberts, DE ; Molukanele, P ; Sparrow, RW ; Rohwer, EG ; Steenkamp, CM Date: Jul 2009 The presentation discusses basic principles of pump-probe technique, possible transient absorption signals, LHC II and ZnPc, experimental setup, chirp measurement and correction methods. The results of the study, conclusion and future work ... Read more
An ultrafast study of Zinc Phthalocyanine in DMSO

Author: Ombinda-Lemboumba, Saturnin ; du Plessis, A ; Botha, LR ; Rohwer, EG ; Steenkamp, CM Date: Oct 2010 The ultrafast dynamics of Zinc Phthalocyanine was studied using trasient absorption pump probe spectroscopy. Zinc Phthalocyanine was excited (pumped) at 672nm and probed by a white light continuum. The pump-probe technique used in this study ... Read more
Ultrafiltration and valorisation of lignin in black liquor from South African Kraft mills: A focus on dead-end stirred cell filtration

Author: Kekana, PT ; Sithole, Bishop B ; Ramjugemath, D ; Pillay, L Date: Jul 2014 The main aim of this project is to develop a method that can effectively extract lignin from Kraft black liquors from South African mills in the form that would be suitable for valorisation into high value products. In this study the effects ... Read more
Ultrasonic detection of cracks in uniaxial glass fibre rods

Author: Loveday, Philip W ; Wood, D Date: Jan 2006 A non-destructive examination procedure based on a guided wave inspection approach is used for the acoustic examination of glass fibre reinforced composite rods. This paper contains an investigation into the characteristics of guided wave ... Read more
Ultrasonic exfoliation of NiFe LDH/CB nanosheets/few layered sheets for enhanced oxygen evolution electrocatalysis

Author: Tshimangadzo, Munonde S ; Zheng, Haitao ; Nomngongo, PN Date: Aug 2019 This presentation discusses the ultrasonic exfoliation of NiFe LDH/CB nanosheets/few layered sheets for enhanced oxygen evolution electrocatalysis. Read more
An ultrasonic-based localization system for underground mines

Author: Jordaan, JP ; Kruger, Carel P ; Silva, B ; Hancke, GP Date: Jul 2017 Localization is important for a wide range of industries and applications. In underground mining, for instance, it is helpful to know the miners’ locations, particularly in emergency situations. One way this can be achieved is by using ... Read more
The Ulwazi Concept: Virtual interactive and collaborative classrooms of the Future

Author: Beyers, R Date: Aug 2006 The Ulwazi concept is based on the digital inclusion of geographically separated classrooms being linked by broadband radio connections to enable virtual interactive and collaborative lessons using SMART technologies. What started out as a ... Read more
Umbiflow: Improving primary-level ante-natal care whilst reducing secondary-level patient load

Author: Wallis, J Date: Oct 2012 In this presentation the author describes the development of a low-cost, umbilical blood-flow monitoring device suitable for use by nurses in a primary health care setting, showing the impact that can be made for both patients and the health ... Read more
UML modelling of network warfare examples

Author: Veerasamy, Namosha ; Eloff, JHP Date: Aug 2011 The aim of this paper is to clarify the concept of Network Warfare by looking at a typical example that illustrates both the exploitation and protection of information using various aspects of Information and Communication Technology (ICT). ... Read more
Unary self-verifying symmetric difference automata

Author: Marais, Laurette ; Van Zijl, L Date: Jul 2016 We investigate self-verifying nondeterministic finite automata, in the case of unary symmetric difference nondeterministic finite automata (SV-XNFA). We show that there is a family of languages Ln=2 which can always be represented non-trivially ... Read more
Uncertainty evaluation of data and information fusion within the context of the decision loop

Author: De Villiers, J Pieter ; Jousselme, A-L ; De Waal, A ; Pavlink, G ; Laskeyz, K ; Blasch, E ; Costa, P Date: Jul 2016 In this paper, the principle taxonomy of the fusion process, the decision loop, is unified with uncertainty quantification and representation. A typical flow of information in the decision loop takes the form of raw information, uncertainty ... Read more
Uncertainty representation, quantification and evaluation for data and information fusion

Author: De Villiers, Johan P ; Laskey, K ; Jousselme, A-L ; Blasch, E ; Pavlin, G ; Costa, P Date: Jul 2015 Mathematical and uncertainty modelling is an important component of data fusion (the fusion of unprocessed sensor data) and information fusion (the fusion of processed or interpreted data). If uncertainties in the modelling process are not ... Read more
Under-resourced speech recognition based on the speech manifold

Author: Sahraeian, R ; van Compernolle, D ; De Wet, Febe Date: Sep 2015 Conventional acoustic modeling involves estimating many parameters to effectively model feature distributions. The sparseness of speech and text data, however, degrades the reliability of the estimation process and makes speech recognition a ... Read more
Underground mine navigation using an integrated IMU/TOF system with unscented Kalman filter

Author: Hlophe, K ; Green, J Date: Jul 2011 Platform pose (localization and orientation) information is a key requirement for autonomous mobile systems. The severe natural conditions and complex terrain of underground mines diminish the capability of most pose estimation systems, ... Read more
Underground mining robot: a CSIR project

Author: Green, JJ Date: Nov 2012 The Council for Scientific and Industrial Research (CSIR) in South Africa is currently developing a robot for the inspection of the ceiling (hanging-wall) in an underground gold mine. The robot autonomously navigates the 30 meter long by 3 ... Read more
Underground navigation and localisation using RFID tags

Author: James, S ; Verrinder, RA ; Sabatta, D ; Shahdi, A Date: Oct 2012 One of the major issues in the field of mobile robotics is localisation and navigation in an unknown environment. These tasks become even more challenging in an underground environment where no GPS signals or stationary landmark towers are ... Read more
Underground verification of the large deflection performance of fibre reinforced shotcrete subjected to high stresses and convergence and to dynamic loading.

Author: Joughin, WC ; Human, JL ; Terbrugge, PJ Date: Apr 2002 The nature of this project requires that various types of shotcrete be applied to a tunnel and that the performance thereof under extensive deformation be monitored over a period of time. In order to achieve this, one of the most critical ... Read more
Underlying finite state machine for the social engineering attack detection model

Author: Mouton, Francois ; Nottingham, Alastair T ; Leenen, Louise ; Venter, HS Date: Aug 2017 Information security is a fast-growing discipline, and relies on continued improvement of security measures to protect sensitive information. In general, human operators are often highly susceptible to manipulation, and tend to be one of the ... Read more

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