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Investigating pollination success between Pinus radiata and selected pine species by Ham, Hannel
Published 2018Get full text
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Page will reload when a filter is selected or excluded.- Computer Science 28 results 28
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- Background: Oral health related quality of life measures provide alternative ways to evaluate oral health status in a way that prioritises impact on lifestyle. These measures are, however, hardly used in our setting. Before the measures can be used effectively, validity of the tool needs to be evaluated. The aim of the study was to validate the Oral Impact on Daily Performance (OIDP) frequency scale in an adult Nigerian patient population. Methodology: This was a descriptive cross sectional study in which consecutive patients attending the Primary Oral Health Care Centre, Idikan and the Oral Diagnosis Clinic of the University College Hospital, Ibadan were recruited. Data was collected with OIDP structured interviewer administered questionnaires, global self-rating and perceived treatment need questions and by oral examination. The frequency scale of the OIDP index was used to compute the impact scores. Data collected was subjected to statistical analysis using SPSS version 19. Results: A total of 204 patients participated in the study. The OIDP score ranged from 0 to 40; 78.9% of the participants reported an impact on daily performance with eating and enjoying food being the most reported activity impacted upon. The Cronbach’s alpha coefficient was 0.811; the OIDP index was significantly associated with global self ratings of oral health, perceived need for dental treatment and was able to discriminate between patients with or without dental caries. Conclusion: The OIDP frequency scale exhibited satisfactory psychometric properties amongst adult dental patients in Ibadan, Nigeria 2 results 2
- Computed tomography 2 results 2
- Computer Games 2 results 2
- Internal consistency 2 results 2
- Mathematics 2 results 2
- OIDP 2 results 2
- One of the major problems facing drilling operations is the performance of the drilling Bits. The ability of the Bit to crush the rock and the removal of the crushed rock from the wellbore effectively. It is necessary to understand the fundamental difference in Bit design for different rock textures because many variables tend to affect Bit optimization, particularly the type of formations, economics and Bit selection. However, the cost of drilling a well has a considerable effect on the selection and the design of a particular Bit, therefore this paper focuses on the development of a model that will predict future Bit performance and optimization for actual well design and construction. The variables to optimize Bit performance provide means of handling cost estimation hence the model becomes more realistic and dynamic in its application. The input variables and control factors for this model are stretched to minimize cost and maximize performance. The cost per foot and the break even calculations were done using data from the reference well X14 and also the evaluation well X35 from a field-X in the Niger Delta region. A Visual Basic dot Net program model was developed, tested and validated with the real field data to know its accuracy. The model interface shows the detailed application of the Bits in validating the data to provide the equivalent results for the five different Bits. Each set of the Bit record was ran separately on the software and the results for each application developed for comparison. In the software, data application were grouped into two distinct methods namely; rentals method and historical method. Under the rentals method, data were uploaded into the software and ran to generate results while the historical method was basically used for model prediction. The breakeven analysis provided a technique for calculating the performance required for an alternative Bit type to match the cost per foot of the current Bit. Based on the model results, Hughes Tungsten Carbide (HTC) Bit and Security Bit (SEC) used to drill well X14 and X35 were well optimized and should be encouraged in drilling wells within the area. 2 results 2
- Oral health 2 results 2
- Quality of life 2 results 2
- Reliability indices are considered to be reasonable and logic ways to judge the performance of an electric power system. Reliability indices which are proposed by the IEEE are used to evaluate the performance of selected distribution systems on the national grid. Ten years of outage data (1998 - 2007) from seven selected distribution systems on the national grid were used as case studies in this research work. A generalized model is developed for a quantitative evaluation of relative indices of the national grid system. The development of the model stated with identification of the system reliability indices and estimating the contributions of system indices to the failure rate of the selected distribution system on the national grid. The computed system reliability indices are used as input parameters for the generalized model. Relative CAIDI index is computed by simulation using MATLAB 7.7 which automatically generates the graph of the relative CAIDl against names of feeders. The percentage average relative CAIDls for Ibadan, Port-Harcourt and Benin distribution systems are 71.86%, 52.79% and 75.79% respectively, thus, average reliability levels. Ilorin, Ikeja, Kaduna and Kano distribution systems have percentage average relative CAIDls of 11.95%, 39.76%, 40.17% and 41.08% respectively with poor reliability levels. With the aid of curve fitting (cf) tools, two distinct model equations were developed from which a generalized model is formulated for a quantitative evaluation of reliability indices of the national grid. The generalized model is a polynomial function whose order depends majorly on the level of industrialization of the distribution systems and the number of distribution feeders. 2 results 2
- Self rating 2 results 2
- Validity 2 results 2
- " A geophysical investigation has been performed using Vertical Electrical Sounding (VES) at a site behind Sammy Guest House in Ikere-Ekiti, Ekiti-State to examine the geophysical parameters that can be used to evaluate the structural competence of the shallow section of the subsurface for construction purposes and building development. The schlumberger configuration was used for the data acquisition. The half- currents electrode (AB/2) was used and the quantitative interpretation of the VES involved partial curve matching and 1-D computer iteration. The field data acquired was presented as geoelectric curves and geoelectric section. The interpretation of the field results showed a significant overburden that is up to 8m. The major subsurface layers are the topsoil (mainly clayey sand and sandy clay), lateritic layer and weathered formation. The northern part of the study area shows the lowest resistivity values that suggest high clay content or possible fracture which have impact on the competence and integrity of the soil construction and building development. Therefore, for building development in the study area, the topsoil must be excavated to a reasonable depth at which the soil is adequately competent and choice of foundation material must take into account the characteristics of the clayed material. " 1 results 1
- " Flow variability of ephemeral rivers due to spatial and temporal distribution of rain fall and unregulated exploitation of water resources is a major cause of severe water supply shortages. With appropriate conservation planning of surface waste resources through hydrological modeling, timing of extraction of large volume without adverse effects on downstream requirement can be predicted. This study attempts to develop water balance components for evaluating flow characteristics essential for conservation planning of ephemeral streams. Daily meteorological data spanning 1973-2006, obtained from the International Institute of Tropical Agriculture, Ibadan weather station were used in developing predominant water balance model components of Ona Stream. Daily infiltration values were obtained using Crawford and Linsley’s model and interflow based on soil moisture levels. Data were statistically analyzed and developed models validated using 10 years meteorological data. Analyses showed that 93.4, 91.5 and 55.0 % variability in runoff was due to precipitation, groundwater storage and interflow respectively. Precipitation, interflow and groundwater storage were significant while evapotranspiration was insignificant (P.0.05) for runoff prediction. The water balance models simulated acceptable hydrologic processes such as interflow and groundwater storage which are generally difficult to measure directly. The R2 values obtained from validation range from 0.79 to 0.99. The water balance model thus improved the reliability of streamflow computation and other flow characteristics of the ephemeral Ona stream. It would appear that the ephemeral streamflow investigated depended more on the magnitude of precipitation interflow and groundwater flow while evapotranspiration (a major source of water loss in hydrologic water balance model) has relatively little effect on streamflow characteristics." 1 results 1
- " The Aluminium Smelting Company, located in Ikot Abasi area, lies within the dominantly clastic rocks of the Benin Formation of the eastern Niger Delta. In order to evaluate the level of environmental contamination associated with this major industrial project, concentrations of trace elements and major elements in representative samples of soil, stream sediments and water in the vicinity of the industrial complex were determined by ICP-OES (for soil and stream sediments) and Atomic Absorption Spectrophotometer (AAS) (for water). Samples from a control site, about 3km from the complex were also collected and analyzed for the same set of elements, Results revealed that concentrations of all the elements in the sampled materials were within background levels in comparison with those from the control site. The trace and major element variations show some slight decreasing concentration with increase distance from the factory site for mostly Pb, Zn Cu, Ni for the trace elements and Ca for the major element. There is no significant variation in the soil profile with depth for the elements. Generally, concentration of elements is in the order: Zn>Pb>Ni>Cu and Fe>Al>Ca>Mg>Na>K for the trace and major elements respectively. Computation of geo-accumulation index for the soils revealed no secondary enrichment. Application of R-mode factor analysis shows four groupings, reflecting lithological and environmental controls. The stream sediments show generally low concentrations that fall within the concentration range of sediments of similar provenance elsewhere. Metal concentration levels in the water show higher values for the surface water. Both hydrophysical and chemical parameters have slight elevated values when compared with the control and reflect a dominant geogenic source. Generally, they lie within the ambits of the World Health Organization (WHO) Standards of water quality and pose no threat to aquatic or human community. " 1 results 1
- "Background: Annotation and Image Markup on ClearCanvas Enriched Stroke– phenotyping Software (ACCESS) is a novel stand-alone computer software application that allows the creation of simple standardized annotations for reporting brain images of all stroke types. We developed the ACCESS application and determined its inter-rater and intra-rater reliability in the Stroke Investigative Research and Educational Network (SIREN) study to assess its suitability for multicenter studies. Methods: One hundred randomly selected stroke imaging reports from 5 SIREN sites were re-evaluated by 4 trained independent raters to determine the inter-rater reliability of the ACCESS (version 12.0) software for stroke phenotyping. To determine intra-rater reliability, 6 raters reviewed the same cases previously reported by them after a month of interval. Ischemic stroke was classified using the Oxfordshire Community Stroke Project (OCSP), Trial of Org 10172 in Acute Stroke Treatment (TOAST), and Atherosclerosis, Small-vessel disease, Cardiac source, Other cause (ASCO) protocols, while hemorrhagic stroke was classified using the Structural lesion, Medication, Amyloid angiopathy, Systemic disease, Hypertensive angiopathy and Undetermined (SMASH-U) protocol in ACCESS. Agreement among raters was measured with Cohen’s kappa statistics. Results: For primary stroke type, inter-rater agreement was .98 (95% confidence interval [CI], .94-1.00), while intra-rater agreement was 1.00 (95% CI, 1.00). For OCSP subtypes, inter-rater agreement was .97 (95% CI, .92-1.00) for the partial anterior circulation infarcts, .92 (95% CI, .76-1.00) for the total anterior circulation infarcts, and excellent for both lacunar infarcts and posterior circulation infarcts. Intra-rater agreement was .97 (.90-1.00), while inter-rater agreement was .93 (95% CI, .84-1.00) for TOAST subtypes. Inter-rater agreement ranged between .78 (cardioembolic) and .91 (large artery atherosclerotic) for ASCO subtypes and was .80 (95% CI, .56-1.00) for SMASH-U subtypes. Conclusion: The ACCESS application facilitates a con cordant and reproducible classification of stroke subtypes by multiple investigators, making it suitable for clinical use and multicenter research. 1 results 1
- "Runge-Kutta scheme is one of the versatile numerical tools for the simulation of engineering systems. Despite its wide and acceptable engineering use, there is dearth of relevant literature bordering on visual impression possibility among different schemes coefficients which is the strong motivation for the present investigation of the third and fourth order schemes. The present study capitalise on results of tedious computation involving Taylor series expansion equivalent supplemented with Butcher assumptions and constraint equations of well-known works which captures the essential relationship between the coefficients. The simulation proceeds from random but valid specification of two out of the total coefficients possible per scheme. However the remaining coefficients are evaluated with application of appropriate function relationship. Eight and thirteen unknown coefficients were simulated respectively for third and fourth schemes over a total of five thousand cases each for relevant distribution statistics and scatter plots analysis for the purpose of scheme comparison and visual import. The respective three and four coefficients of the slope estimate for the third and fourth schemes have mix sign for large number of simulated cases. However, none of the two schemes have above three of these coefficients lesser than zero. The percentages of simulation results with two coefficients lesser than zero dominate and are respectively 56.88 and 77.10 for third and fourth schemes. It was observed that both popular third and fourth schemes belong to none of the coefficients being zero classification with respective percentage of 0.72 and 3.28 in total simulated cases. The comparisons of corresponding scatter plots are visually exciting. The overall difference 'between corresponding scatter plots and distribution results can be used to justify the accuracy of fourth scheme over its counterpart third scheme. " 1 results 1
- A low cost food processing tray dryer was designed and constructed using locally available material. The dryer design temperature was such that various types of solid food material can be dried. The maximum temperature specified was 80°C. For better design and operational performance, a survey and design appreciation exercises were carried out on the available tray dryers in the Faculty of Technology, University of Ibadan, and Ibadan. The performance of the dryer was tested using (Dioscorea genus) slices at different thickness and various temperatures and it was found that at higher temperatures and smaller thicknesses the product being dried lose their moisture content at a faster rate. The dryer was able to dry the sample product weighing approximately 24g initially to 8.86g at different time for different temperature as outlined below. For 70°C it dried at 19.5hr, for 60°C it dried at 32hr, and for 50°C it dried at 38hr In order to show the effect of temperature, thickness of product to be dried and velocity a computer program was written using visual basic (software) to simulate the performance characteristics. 1 results 1
- Above-ground carbon 1 results 1
- Achievement 1 results 1
- Adaptive Gaussian Quadrature 1 results 1
- Africa 1 results 1
- African Open Access — Natural Sciences 1 results 1
- Aims: To describe a rare case of malignant fibrous histiocytoma at an unusual age of sixteen (16) years. Also to sensitize the medical community to the need for thorough evaluation of an opaque hemithorax and to describe the imaging features of this rare neoplastic disease. Presentation of Case: This was a 16 year old girl who presented with progressive swelling and recurrent right chest pain of 10 months duration and difficult breathing of 6 weeks duration. There was associated weight loss, dry cough and low grade intermittent fever. She had solitary cervical lymphadenopathy, grade II finger clubbing and low hematocrit. Discussion: Malignant fibrous histiocytomas (MFHs) are tumors of adulthood with a mean age of 59 years. It has predilection for the extremities, the abdominal cavity and the retroperitoneum. Primary pleural occurrence is relatively rare. This is a rare case of an extensive malignant fibrous histiocytoma of the right pleura with chest wall involvement presenting at an unusual young age of 16 years, at variance with the ages documented in the literatures. Imaging findings of the histologically proven tumor were also described on high resolution chest Computed Tomography. Conclusion: Malignant fibrous histiocytomas may occur much earlier than the age documented in most literatures. This case showed that not all cases of extensive opaque hemithorax are due to massive pleural effusion and further and better diagnostic imaging will be necessary for prompt and proper management. 1 results 1
- Air-sea unmanned aerial vehicle 1 results 1
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- International Journal of 3D Printing Technologies and Digital Industry 3 results 3
- Journal of the Brazilian Computer Society 3 results 3
- IEEE Access 2 results 2
- Inform: Jurnal Ilmiah Bidang Teknologi Informasi dan Komunikasi 2 results 2
- Innovative Systems Design and Engineering 2 results 2
- International Journal of Advanced Computer Science and Applications 2 results 2
- International Journal of Computer Science in Sport 2 results 2
- JMIR Serious Games 2 results 2
- JMIR mHealth and uHealth 2 results 2
- Mobile Information Systems 2 results 2
- Advances in Human-Computer Interaction 1 results 1
- Advances in Multimedia 1 results 1
- Applied Computer Systems 1 results 1
- Applied Informatics 1 results 1
- Bioinorganic Chemistry and Applications 1 results 1
- Bulletin of the Chemical Society of Ethiopia 1 results 1
- Canadian Respiratory Journal 1 results 1
- Complex Adaptive Systems Modeling 1 results 1
- Computational and Mathematical Methods in Medicine 1 results 1
- Computer Engineering and Intelligent Systems 1 results 1
- Computer Science (AGH University) 1 results 1
- Empirical Software Engineering (Open Access Articles) 1 results 1
- IET Networks 1 results 1
- IJU Case Reports 1 results 1
- International Journal of Electrical and Computer Engineering 1 results 1
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- International Journal of Modern Education and Computer Science 1 results 1
- Journal of Computational Design and Engineering 1 results 1
- Journal of Computational Vision and Imaging Systems 1 results 1
- Journal of Computer Science and Technology Studies 1 results 1
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- SUNScholar — Stellenbosch University Repository 690 results 690
- UPSpace — University of Pretoria Institutional Repository 424 results 424
- UCTD — University of Cape Town Open Access Repository 409 results 409
- AUC Knowledge Fountain — bepress 48 results 48
- KNUSTSpace — Kwame Nkrumah University of Science & Technology (Ghana) 8 results 8