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Search Results: 1 - 10 of 660501 matches for " T. C. A. Molteno "
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Automated weighing by sequential inference in dynamic environments
A. D. Martin,T. C. A. Molteno
Physics , 2015, DOI: 10.1109/ICARA.2015.7081159
Abstract: We demonstrate sequential mass inference of a suspended bag of milk powder from simulated measurements of the vertical force component at the pivot while the bag is being filled. We compare the predictions of various sequential inference methods both with and without a physics model to capture the system dynamics. We find that non-augmented and augmented-state unscented Kalman filters (UKFs) in conjunction with a physics model of a pendulum of varying mass and length provide rapid and accurate predictions of the milk powder mass as a function of time. The UKFs outperform the other method tested - a particle filter. Moreover, inference methods which incorporate a physics model outperform equivalent algorithms which do not.
A Comparison of Genetic Programming with Genetic Algorithms for Wire Antenna Design
P. J. Williams,T. C. A. Molteno
International Journal of Antennas and Propagation , 2008, DOI: 10.1155/2008/197849
Abstract: This work compares the performance of genetic programming (GP) against traditional fixed-length genome GA approaches on the optimization of wire antenna designs. We describe the implementation of a GP electromagnetic optimization system for wire structures. The results are compared with the traditional GA approach. Although the dimensionality of the search space is much higher for GP than GA, we find that the GP approach gives better results than GA for the same computational effort. In addition, we find that a more expressive antenna structure grammar, dramatically, improves the performance of the GP approach.
Navigation by Induction-Based Magnetoreception in Elasmobranch Fishes
T. C. A. Molteno,W. L. Kennedy
Journal of Biophysics , 2009, DOI: 10.1155/2009/380976
Abstract: A quantitative frequency-domain model of induction-based magnetoreception is presented for elasmobranch fishes. We show that orientation with respect to the geomagnetic field can be determined by synchronous detection of electrosensory signals at harmonics of the vestibular frequency. The sensitivity required for this compass-sense mechanism is shown to be less than that known from behavioral experiments. Recent attached-magnet experiments have called into doubt the induction-based mechanism for magnetoreception. We show that the use of attached magnets would interfere with an induction-based mechanism unless relative movement between the electrosensory system and the attached magnet is less than 100 m. This suggests that further experiments may be required to eliminate induction as a basis for magnetoreception.
Benard-Marangoni Convection in Two Layered Liquids
Wayne A. Tokaruk,T. C. A. Molteno,Stephen W. Morris
Physics , 1998,
Abstract: We describe experiments on B{\'e}nard-Marangoni convection in horizontal layers of two immiscible liquids. Unlike previous experiments, which used gases as the upper fluid, we find a square planform close to onset which undergoes a secondary bifurcation to rolls at higher temperature differences. The scale of the convection pattern is that of the thinner lower fluid layer for which buoyancy and surface tension forces are comparable. The wavenumber of the pattern near onset agrees with the prediction of the linear stability analysis for the full two-layer problem. The square planform is in qualitative agreement with recent one- and two-layer nonlinear theories, which fail however to predict the transition to rolls.
Measuring the performance of sensors that report uncertainty
A. D. Martin,T. C. A. Molteno,M. Parry
Physics , 2014,
Abstract: We provide methods to validate and compare sensor outputs, or inference algorithms applied to sensor data, by adapting statistical scoring rules. The reported output should either be in the form of a prediction interval or of a parameter estimate with corresponding uncertainty. Using knowledge of the `true' parameter values, scoring rules provide a method of ranking different sensors or algorithms for accuracy and precision. As an example, we apply the scoring rules to the inferred masses of cattle from ground force data and draw conclusions on which rules are most meaningful and in which way.
Traveling Granular Segregation Patterns in a Long Drum Mixer
Kiam Choo,T. C. A. Molteno,Stephen W. Morris
Physics , 1997, DOI: 10.1103/PhysRevLett.79.2975
Abstract: Mixtures of granular media often exhibit size segregation along the axis of a partially-filled, horizontal, rotating cylinder. Previous experiments have observed axial bands of segregation that grow from concentration fluctuations and merge in a manner analogous to spinodal decomposition. We have observed that a new dynamical state precedes this effect in certain mixtures: bi-directional traveling waves. By preparing initial conditions, we found that the wave speed decreased with wavelength. Such waves appear to be inconsistent with simple PDE models which are first order in time.
The Dynamics of Granular Segregation Patterns in a Long Drum Mixer
Kiam Choo,Michael W. Baker,T. C. A. Molteno,Stephen W. Morris
Physics , 1998, DOI: 10.1103/PhysRevE.58.6115
Abstract: We have studied the early time evolution of granular segregation patterns in a horizontal rotating cylinder partially filled with a sand/salt mixture. The growth of concentration fluctuations starting from premixed initial conditions was analyzed using Fourier techniques. In one mixture, we observed generally merging dynamics in the segregated bands up to the onset of saturation. At the threshold of saturation, we found a spectrum of wavelengths with a broad peak. The peak position was nearly independent of the tube rotation rate. The overall growth rate of Fourier modes had a maximum at a particular value of the angular rotation frequency. In a slightly different mixture, we observed transient traveling waves when the larger grains were in the majority. We measured the wave speed as a function of several parameters using presegregated initial conditions to launch waves of various wavelengths.
The Use of Topical Tacrolimus 0.1% Skin Ointment for Anterior Segment Conditions: A Case Series
Poorna Abeysiri, Nicholas R. Johnston and Anthony C.B. Molteno
Ophthalmology and Eye Diseases , 2012, DOI: 10.4137/OED.S0
Abstract: Tacrolimus (FK 506) is a macrolactam derivative with immunomodulatory and anti-inflammatory activity. Topical tacrolimus 0.03% has been used for inflammatory conditions of the anterior segment. This article adds to the literature on the off-license application of tacrolimus ointment, by describing the safe and effective use of the higher strength of 0.1% topical tacrolimus skin ointment in four patients. To our knowledge this is the first report of topical tacrolimus 0.1% ointment applied to the conjunctival sac for the treatment of atopic keratoconjunctivitis, vernal keratoconjunctivitis and the post-operative management of trabeculectomy and graft rejection in steroid responders.
Molecular Identification of Campylobacter Species from Positive Cultural Stool Samples of Diarrhoeic Children in Osun State  [PDF]
O. C. Adekunle, A. A. Onilude, T. O. Sanusi
Open Journal of Medical Microbiology (OJMM) , 2019, DOI: 10.4236/ojmm.2019.91002
Abstract: Death of infants from diarrhoea is a common occurrence in sub-Saharan Africa. This is attributed to unhygienic practices which aid the proliferation of diarrhoea-causing microorganisms. Among these microorganisms, Cam- pylobacter species have been reported as one of the causal agents, Campylobacter spp. are human intestinal pathogens of global importance and their pathogenicity mechanisms are not well understood. This study was designed to investigate the molecular characterisation of Campylobacter gotten from cultural methods in Osun State. Campylobacters isolated were biochemically characterized and biotyped. Confirmation of Campylobacter was done using flaA gene, hippuricase O for Campylobacter jejuni and aspartokinase gene for Campylobacter coli and single locus sequencing glnA gene were performed by PCR. Twenty five samples were amplified by PCR out of 57 Campylobacter strains that were positive for cultural methods from 815 stool samples with diarrhoea and 100 stool samples without diarrhoea. No Campylobacter was isolated from stools of children in the control group. Twenty-five isolates comprising of 18 Campylobater jejuni and 7 C. coli were identified. The nucleotide sequence of the gln A for all the isolated Campylobacter spp. showed 91.0% similarity with the ones in the GenBank. The C. jejuni was classified into biotypes I (44.4%) and II (55.6%) and all C. coli were of biotype I.
Analysis, Modeling and Simulation of a Poly-Bag Manufacturing System  [PDF]
R. A. R. C. Gopura, T. S. S. Jayawardane
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.45034
Abstract: The cost of raw material of poly-bags increases and fluctuates with an unpredictable trend. Further, legal restrictions imposed on some types of polythene products adversely affects for the demand. In this context, entrepreneurs engaging in poly-bag manufacturing face major challenges. With the purview of optimizing the poly-bag manufacturing process, authors attempted to analyze, model and simulate the poly-bag manufacturing process in the light of posed challenges. This paper presents preliminary analysis, modeling and simulation strategies of a poly-bag manufacturing system. In addition, a risk prioritization method is proposed in the preliminary analysis and also a simulation tool is developed.
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