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Developments in anaerobic digestion modelling by Ghoor, Tasneem
Published 2020“…Due to the complexity of the physical, biological and aqueous interactions, many model simulations were needed to identify the important parameters with the lasso (least absolute shrinkage and selection operator) feature selection method. …”
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Water demand of selected residential properties with access to groundwater in serviced areas of the Cape Peninsula by Wright, Tiaan
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Page will reload when a filter is selected or excluded.- "This investigation derived its strong motivation in the adoption of versions of second-order Runge-Kutta methods where there is presently dearth of relevant literature to re-establish .the complicated nature of solution of buffing oscillator dynamics. The choice of second-order Runge-Kutta methods hinged On its simplest algebraic formulation of relevant coefficients based on Taylor series expansion comparing with its higher order counterpart. Validation of FORTRAN-90 codes of algorithms was achieved by phase plots comparison reference to Dowell (1988) as standard. The nature of simulated solutions were visually determined with scatter plot of phase variables obtained from simultaneous implementation of large number of versions of second-order Runge-Kutta methods in conjunction with the corresponding literature results. Validation results are acceptable to within the accuracy limit of Runge-Kutta methods adopted. The scatter plots on phase plane for cases investigated are well structured and bounded (strange) and compare correspondingly well with literature Poincare sections. This investigation re-establishes the complex nature of solution of Duffings oscillator dynamics. Its established procedures provide an alternative Poincare section method and can be utilised for preliminary verification of system dynamics behaviour subject to confirmation by additional dynamics tests. " 1 results 1
- "This study utilised positive Lyapunov exponents' criteria to develop chaos diagram on the parameters space of 4-dimensionalharmonically excited vibration absorber control Duffing's Oscillator. Relevant simulations were effected by choice combination of constant step Runge-Kutta methods and Grahm Schmidt Orthogonal rules. Simulations of 4-dimensional hyper-chaotic models of modified Lorenz and RÖsier were used for validation purposes. Lyapunov's spectrums were obtained at (197 x 301) mesh points of parameters space (µ,αa). Lyapunov's spectrum of modified Lorenz system by constant time step (NRK1) fourth order Runge-Kutta method (04208.01650. - 0.0807, -26.4603) compare correspondingly well with (0.4254, 0.1286, 0.0000, -26.5493) reported by Yuxia et et. Similarly, Lyapunovs spectrum of modified Rosier system by constant time step (NRK1) fourth order Runge-Kutta method (0.1424, 0.0051, -0.0041, -24.0831) compare correspondingly and qualitatively with (0.1287, 0.0149, -0.0056, -22.8617) reported by Marco (1996). The sum of Lyapunov exponents (-22.7237, -31.3107, -27.8797) in Rosier compare correspondingly and qualitatively with variation matrix measure -AVERT (- 24.0181, -30.9462, -28.1991) respectively for fourth, fifth and modified fifth order Runge-Kutta methods. The chaos diagram results suggested preferentially higher mass ratio for effective chaos control of Duffing's Oscillator main mass. The parameters space in the region of relative lower mass ratio suffered irregular boundaries. The practical applications of this chaos diagram plot include, by instance, walking in the parameters-space of vibration absorber control Duffing's Oscillator along suitable engineering paths. " 1 results 1
- Abelmoschus Esculentus. 1 results 1
- Embedded mobile agent 1 results 1
- Heavy Metals 1 results 1
- Infant nurturing 1 results 1
- Java agent development framework. 1 results 1
- Lagos 1 results 1
- Mobile Agent Technology (MAT), remote method invocation and remote procedure calling are the three most widely used techniques for information storage and retrieval in network environments. Previous studies have shown that MAT provides a more efficient and dynamic approach to information storage and retrieval than others. However, for mobile agents to effectively perform their various tasks, a static agent platform must be installed on the computers. These platforms consume more memory, increase access time and prevent other tasks from running on the computer. Therefore, an alternative framework that will eliminate the problems associated with agent platform is imperative. Consequently, this work was aimed at developing a more efficient framework for mobile agent system deployment as an operating system service. Two classes of existing information retrieval agents were adapted to develop Embedded Mobile Agent (EMA) system. The EMA was embedded into the Windows Operating System (OS) kernel, so that it could run as a service for information retrieval. This was done to eliminate the overheads associated with the middleware provided by agent platforms. The targeted OS were Windows XP, Windows Vista and Windows7. Mathematical models were simulated to assess the performance of EMA by measuring service delay, memory utilisation, fault tolerance, turn around time at fixed bandwidth with varying number of network nodes, and percentage denial of service. Denied services were generated by a random number generator modelled after the Bernoulli Random Variable with 0.1 probability of failure. The model‟s performance was then compared with Java Agent DEvelopment framework (JADE), a widely used open-source existing mobile agent system running on platforms. The implementation was done using four computer systems running the targeted Windows on an existing local area network. Analysis of data was done using descriptive statistics and independent t-test at p = 0.01. The EMA model effectively retrieved information from the network without the agent platform, thereby reducing access times and saving memory, regardless of the version of the Windows OS. The mean service delay for EMA (15067.5 ± 8489.6 ms) was lower than that of JADE (15697.0 ± 8844.5 ms). The embedded agent requires 3 KB of UNIVERSITY OF IBADAN LIBRARY xv memory to run compared to JADE platform requiring 2.83 103 KB. The mean fault tolerance in terms of fault recovery time for EMA was approximately 50% that of JADE (327.8 ± 193.1 ms). The mean turn around time for EMA was 499.7 ± 173.0 ms and JADE was 843.3 ± 321.6 ms consequential to the time JADE spent activating platforms. The mean percentage denial of service for EMA was 14.3 ± 9.8 while JADE was 24.7 ± 18.5. Memory requirements and service delay increased with increasing number of nodes while others show no systematic change. For all the parameters tested, there were significant differences between the two schemes. The embedded mobile agent provided more efficient, dynamic and flexible solution compared to Java Agent DEvelopment framework for distributed information retrieval applications. It could be incorporated into new versions of operating systems as operating system service for universal distributed information retrieval. Keywords: Mobile agent technology, Embedded mobile agent, Operating system service, Java agent development framework. Word count: 497 1 results 1
- Mobile agent technology 1 results 1
- Operating system service, 1 results 1
- Parenting in biblical discourse 1 results 1
- Poultry Litter Management 1 results 1
- Poultry litter constitutes one of the animal wastes that are produced in large quantity. Information on the quantity generated may enhance planning for its utilisation. Quantification of poultry litter (PL) generated and its utilisation is rare in Nigeria. This study was designed to investigate PL management in Lagos, Nigeria and possible utilisation potential. Questionnaires were distributed to poultry farmers in Lagos to evaluate poultry waste generation and management practices. Additionally, PL was also quantified from selected farms. Greenhouse experiments were conducted to evaluate the agronomic effects of raw and composted PL (each applied at 0, 5, 10 t/ha and replicated four times) on the growth and heavy metals uptake of Abelmoschus esculentus (okra). Poultry farms were situated in the residential, non-residential and industrial areas with non-residential areas housing a larger percentage. About 53% of the farms were located near rivers or streams. A few of the poultry farmers treated and utilised PL using chemical and physical methods before disposal. Also, no record of waste utilization was found in 72.3% of the farms. About 87.4% of the farmers quantified the PL generated. About 89.3% of the farmers disposed PL in open dumpsites. Mean poultry litter generated from four farms per bird/day was 0.11 ± 0.001 kg. The HMs contents in plants grown on the poultry treated soils were below the permissible levels in soil. The heavy metals concentrations in the leaves and fruits (which are usually the edible parts of okra plants) for all the treatments fall within WHO/FAO permissible levels. Overall, soil amended with 5 t/ha composted poultry litter performed best in terms of fruit production and reduction in HMs uptake. The use of composted poultry litter as fertiliser at calculated quantity will increase PL management. 1 results 1
- Training 1 results 1
- Training, a generic word for the process of perfecting a specific skill or purpose, encapsulates the rationale for parenting in the book of Proverbs 22:6. However, existing interpretations of the Hebrew ḥănōḵ (train) in the cited text limit it to the disposition, manner, morality and choice of vocation for adolescents while infant nurturing; a more foundational stage in parenting, has been ignored. Consequently, the study analysed Proverbs 22:6 to appropriately situate the necessity, meaning, timing, parental roles, and relevance of nurturing during infancy as a fundamental component of training as prescribed in the selected text.The study adopted John Bowlby‘s Attachment theory which emphasises the impact of parent–infant attachment on the child‘s personality and character formation. The concise Proverbs 22:6 is selected because of the centrality of ḥănōḵ in the process of infant nurturing. The Historical-Grammatical Method which examines the socio-cultural and grammatical structure of a text was utilised in the exegesis of Proverbs 22:6 and its interpretation.The use of ḥănōḵ in its imperative form in Proverbs 22:6 suggests the necessity of training in parenting which aims at averting the adverse effects of parental negligence and irresponsibility.Popular interpretations, which adopt Proverbs as a ‗royal text‘, limit ḥănōḵ to ‗initiating a cadet into the military‘, ‗vocational training‘, ‗preparation for royalty‘, ‗developing a child‘s nature or disposition‘ or ‗exposure to godly rules and principles for living‘, when linked with lanna`ar ‗the child‘ and darKô ‗his way‘. However, from the covenantal viewpoint of which the family is central, ḥănōḵ is appropriately rendered as ‗wholistic training‘ which encompasses nurturing, teaching, discipling, modeling, and disciplining the child in every aspect of life (morally, mentally, emotionally, and economically) from infancy until maturity. Etymologically, ḥănōḵ depicts a mother engaged in the nurturing of an infant by rubbing jam on his gums to stimulate desire.This has dual implications. First, it underscores the timing of‗training‘ (at infancy) because, when parents are addressed, the object of ‗training‘ is predominantly the unborn or an infant, invalidating such renderings of lanna`ar as ‗adolescent‘, ‗squire‘, or ‗cadet‘. Second, it explicates mothers‘ weighty role in establishing attachment and character formation, fundamental in wholistic training. Nevertheless, wholistic training requires joint parental commitment to engage quality time, skill and means. The parallel between lanna`ar in Proverbs 22:6a and zaqen ‗old age‘ in 22:6b accentuates the enduring nature of wholistic training because, when zaqen sets in, people retire from certain vocations or services, yet normal life continues.Therefore, although freedom of choice makes derailment probable, wholistic training, of which nurturing during infancy is foundational, can be remedial. 1 results 1
- the book of Proverbs 1 results 1
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