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The hydrodynamics of supercritical packed countercurrent columns by Franken, Hendrik Hermanus
Published 2020Get full text
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Page will reload when a filter is selected or excluded.- Achievement 2 results 2
- Bilingual mode of instruction 2 results 2
- "All over the world, there is an increasing enrolment level for university admissions in view of the ever-increasing benefits of earning university degrees. Thus, the high population of students in many universities, coupled with a high number of vehicles has made traffic control a challenge to University traffic managers. In this paper, the method of Resca1e Range Analysis (RRA) was used to estimate the Hurst Exponent Value (HEV) for the traffic inflow through the main entrance gate of a university as a control measure. Data from a university in the developing countries was collected and analysed. The number of vehicles that entered consecutively per five minutes was observed between 07:00 and 19:00 over a 144 count and 17 independent cases constructed between adjacent cases. Rescale Range Algorithm platform is then used for the data, and coded in FORTRAN Language. With a case made up of 128 consecutive five-minute dependent traffic inflow records, a total of 3348 vehicles entered the university community within the studied period while the average number of vehicles inflow per hour was 279. Average number of vehicles that entered per five minutes was 24. No vehicle entered between 13:25 and 13:30. For all cases, the estimated HEV range between 0.5742 and 0.6955. The computed average HEV was 0.6303, the coefficient of fitness (R2) for all cases range between 0.9552 and 0.9787, while the computed average value was 0.9680. The HEV greater than 0.5 estimated for all cases is an indication of positive con-elation called Persistent. It expresses the fact that there are extended periods in which the traffic inflow to the university community deviated from the long term mean. This information is useful for vehicle garage design. For reliable estimates of the average HEV for design purposes, the study period should be extended to a whole week or an academic session. " 1 results 1
- "Mathematics has diverse applications as decision making tool. This study investigated the use of a proposed pure mathematical formulation (i.e. excluding human factor) for citing appropriately the location of political capital ci of an inhabited designated area. Digitized data of Scale map of Nigeria as a case study was used as input to a FORTRAN 90 programme codes of an equivalent least squares method mathematical formulation. The resulting simultaneous equations involving the political capital city coordinates as unknown variables were solved using Gauss Elimination Algorithm. The political capital city Cartesian coordinate prescribed as (26, 24) in grids unit for the studied case of scale map of Nigeria compared visually satisfactorily with Abuja location on the Map. The Nigeria land area cover was under-estimated by 2.3% referencing 923,768 sq km obtained from Microsoft Encarta Premium (2009). Similarly the Nigeria coastline was estimated. as 25.3% of the country's estimated perimeter (3369 krn). This mathematical tool can be used to cite the centrally located capital city or capital city relocations economically, timely, accurately and reliably. This programme can also be used for citing of capital cities for other countries and center of any irregular shapes on two dimensional plane. " 1 results 1
- "The challenges of ever-increasing demand for university education in the face of inadequate human and infrastructural resources and rapidly increasing population have necessitated distance learning programmes. This study evaluated Universities of Ibadan and Lagos Distance Learning Programmes. Samples of 200 participants (100 graduates. and 100 employers) were purposively selected. Two research questions guided the research. Two validated instruments with reliability coefficients of 0.82 and O.86 respectively, were used to collect data. Data were analysed using chi square and independent t-test. Findings revealed that graduates of UIDLC performed significantly better than their ULDLI counterparts, in terms of class of degree obtained: a chi-square value of (1632.18) which is significant at 0.05, (p < 0.05). This shows that there is a statistical significant difference in the performance of UIDLC distance learning education graduates and their ULDLI counterparts and it is to the advantage of UIDLC . In addition, graduates of both programmes were making similar positive impact in their work environment as the difference in their job performance is not statistically significant. The two distance learning institutions strove to achieve the objectives of providing quality education through distance learning mode of instruction in educating distance learners to enhance learner's productivity.Recommendations made were: the two institutions must aim at improving teachinglearning resources, learner-support services and establishing human resource development centres to aid develop strong and holistic human resources in order to improve quality of their graduates and also position distance education in Nigeria for international recognition." 1 results 1
- Acoupedic Therapy 1 results 1
- An electronic component is an entity in a system which can not be further sub divided in the course of a given relability. However a component can make up parts which is regarded as self-contained unit. Thus while thereliability of a system can be influenced by altering its structure, the reliability of what is considered a component cannot be changed in such a manner, and if different characteristics are desired, the component must be replaced by another with different reliability parameters. Electronic components can be classified into two groups. The first group are those that are observed only until they fail, because either they cannot repaired, or the repair is uneconomical, or the problem is such that only the life history up to the first failure is of interest. These called non-reparable (or non-repaired) and their failures are catastrophic. The second group are those components that are repaired upon failure, hence their life histories consist of alternating operating and repair periods. They are called repairable components. This paper presents the basic concept of electronic component reliability and quality assurance. A brief historical perspective is presented along with operational definitions. The factors affecting reliability as well as the costs to provide reliability re also described. Failure modes are depicted as well as the environmental effects that affects reliability. 1 results 1
- Anambra state 1 results 1
- Basic Science 1 results 1
- Bilingual mode of instruction is considered very important at the primary level of education. This becomes very necessary due to the multiplicity of languages evident in some countries like Nigeria. Consequently, bilingual situation is observed in primary schools at certain levels of primary education. Pupils learn and are taught in English language which is quite different from their ethnic languages. The study therefore investigated the effect of bilingual mode of instruction on pupils’ achievement in Social Studies. The study adopted quasi- experimental approach. Stratified and simple random sampling was used to draw a sample of200 basic six (6) pupils from four schools (two rural and two urban schools) for the study. The instrument (Social Studies Achievement Test (SSAT) was developed by the researchers and used for data collection. The instrument was subjected to Kuder Richardson 21 with reliability coefficient of 0.82. The result of the study show that the bilingual mode of instruction has significant effect on achievement of pupils in Social Studies F (1.191) - 72.738, p< 0.05 Partial Eta Square n?= .276. Therefore the effect size (27.6%) is moderate. Hence, mode of instruction accounted for 27.6% of the total variance in the pupils’ achievement in Social Studies. 1 results 1
- COVID-19 1 results 1
- Code alternation has become a common feature of oral conversation among bilinguals. However, scholars do not agree on the reasons for this. While some see it as a sign of linguistic deficiency, some see it as a welcome development and a normal feature of bilinguals. Several studies have been carried out on incidence of code alternation both locally and internationally. But very few of such studies examined reasons and implications for code alternation among Yoruba/English bilingual students. This study examines the variables that may influence bilingual —pre-service teachers in colleges of education to alternate codes in their verbal communication. Descriptive survey design was adopted in the study and all pre-service teachers at Emmanuel Alcyande College of Education, Oyo, Oyo state and Federal College of Education, Abeokuta, Ogun State constituted the population. Four hundred students were randomly selected for this study while a self constructed questionnaire titled “Code Alternation in Pre-service Teacher Communication; Reasons and Implications” which had a reliability coefficient index of 0.68 was used to elicit responses from the subjects. Chi square was used to analyse the data generated in the study. Findings revealed that participants' roles and relationship have significant influence on code alternation. Also, there is significant influence of situational factors on code alternation among the pre-service teachers in colleges of education. Based on the findings of the study, appropriate recommendations were made. 1 results 1
- Computer literacy 1 results 1
- Digital skills 1 results 1
- Digital technologies 1 results 1
- Earlier studies by this author in 1976 provided evidence of an association between an infective, sexually transmitted agent, the Herpes Simplex Virus Type-2 (HSV—2) and human carcinoma of the cervix, irrespective of geographic location or ethnic origin of the individuals. Similarly, HSV-2 related antigens were demonstrated by the indirect immuno-fluorescent technique in desquamated cells of carcinoma of the cervix tissues from tumour bearing patients. To highlight the Potentials of the detection of tumour antigens in tumour-faearing patients as aid to early diagnosis of the cancer, Isolation and purification of the Tumour Associated Antigens (TAA) of human cancer of the cervix were attempted by immunological and physicochemical procedures in this study. Two antigen preparations, one the Soluble Antigens (SA), and the other, the Membrane Bound Antigens (MBA) were prepared from a pool of cancer of the cervix (CaCx) tissues. The soluble antigens were extracted by homogenization in Earle’s Balanced Salt Solution (EBSS) containing antibiotics, and the membrane-bound antigens were solublised by 3-molar potassiurn Chloride (3 Molar KCl). For isolation and purification of TAA, procedures for the purification of proteins were explored. These include physicochemical stepwise ammonium sulphate fractionation, sephadex ion exchange chromatography, sephacryl S-200 gel filtration, and affinity chromatography to eliminate the normal tissue components of the antigen fractions. Hyperimmune rabbit sera were then prepared against the partially purified TAA. Immunodiffusion studies, employing hyperimmune rabbit sera prepared against the partially purified TAA were used to demonstrate tumour associated antigens in the various cancer antigen preparations, and Circulating Tumour Associated Antigens (C-TAA) in the sera of tumour- bearing patients. The TAA in the cancer tissues showed lines of identity with the C-TAA in patients sera. Techniques involving adsorption by immuno-precipitation-in-gel with Normal Cervix (NCx) tissue antigen preparations, and pooled Normal Human Sera (NHuS) were utilized for the removal of antibodies to NCx and NHuS in the rabbit sera, after which there were no reactions with NCx indicating the specificity of TAA for CaCx. A comparison of the soluble and 3 Molar KCl extracts of the cancer antigens by immuno-precipitation reaction, using adsorbed hyperimmune rabbit sera prepared against the partially purified CaCx TAA, demonstrated three TAA (TAA-1, close to the central antisera well, TAA-2, intermediate and TAA-3, close to and curving towards the peripheral antigen well) in the soluble antigen preparation. Only one TAA (probably identical to the TAA-3 of the soluble antigen) was demonstrated in the 3 Molar KCl extract. Using the rabbit antisera against the partially purified CaCx TAA, adsorbed with NCx and NHuS, results of coded sera showed that immunodiffusion reaction was able to detect circulating TAA in 75.0 per cent of patients with cancer as compared with 5.6% in women with benign gynecological diseases, 1.4% in pregnant women and 0.0% in healthy control women. The result indicates that the test has great potential for immunodiagnosis of cancer of cervix. Although the sensitivity of the test method was low, the specificity was high, and could provide a means of early diagnosis of neoplastic changes in the cervix. The detection of Circulating-TAA as tumour markers in sera of patients, may someday become routine, and thus make earlier diagnosis of cancer possible. Indications are that immuno-diagnostic procedures can be designed in ways that are reproducible, simple and reliable. Such serological tests would extend our present ability for detection and monitoring of malignancies. 1 results 1
- Economic challenges in Nigeria have prompted many undergraduate students to engage in social media entrepreneurship for financial sustainability. Platforms like Facebook and Instagram provide cost-effective business opportunities. While this entrepreneurship offers benefits, it raises concerns about its impact on academic performance, especially as students often multitask between business and studies. Grounded in the Uses and Gratifications Theory, this study investigated the relationship between social media entrepreneurship and the academic performance of undergraduates. A descriptive survey research design was employed, using a randomly selected sample of 200 students from five faculties: Education, Arts, Sciences, Law, and Social Sciences at the University of Ibadan. The instrument used for data collection was the Social Media Entrepreneurship and Academic Performance Questionnaire (SMEAPQ), which included structured items eliciting responses on the social media platforms used for entrepreneurial activities, the types of social media businesses engaged in, the influence of motivation on entrepreneurial engagement, and the impact on academic performance. The reliability of the questionnaire was established through a pilot test, yielding a coefficient of 0.75. Data were analysed using both descriptive and inferential statistics. Specifically, Pearson Product-Moment Correlation (PPMC), t-tests, and means were utilized. The findings revealed that undergraduates primarily use WhatsApp (X̄=3.59), Instagram (X̄=2.97), and Telegram (X̄=2.87) for entrepreneurial ventures, focusing on influencer marketing (X̄=3.31), web development/coding (X̄=3.24), affiliate marketing (X̄=3.19), and e-commerce (X̄=3.05). A significant positive relationship was found between undergraduate motivation and engagement in social media entrepreneurship (r=.222; p<0.05), aligning with the Uses and Gratifications Theory. Additionally, a significant positive association was observed between engagement in social media entrepreneurship and undergraduates’ academic performance (r=.236; p<0.05). The study revealed that female students had better engagement in social media businesses than male students (t(195) =-3.76; p<0.05). There is a need for targeted support to help students balance business and academics, in order to foster both financial independence and academic success. 1 results 1
- Effective teaching 1 results 1
- Environment 1 results 1
- Financial Independence 1 results 1
- Forest conservation information, 1 results 1
- Framing 1 results 1
- Gender 1 results 1
- Hearing Impairment 1 results 1
- Homestay 1 results 1
- It adopted quasi- experimental approach. A multistage sampling technique was used to draw a sample of200 basic six (6) pupils from four schools. The instrument used for the data collection was Basic Science achievement Test (BSAT). It was developed by the researchers. Trial test of the instrument was done using Kuder Richardson 21. The reliability coefficient is 0.80. The result of the study shows that the bilingual mode of instruction had significant effect on Basic Science F (1.191) = 57.10, p< 0.05 Partial Eta Square = .230. Therefore the effect size (23%) is moderate. The bilingual mode of instruction also has significant main effect on gender in achievement of pupils in Basic Science F (1191)=9.76, p= .002 partial eta squared = .049 . However the effect size (4.9%) is low. Therefore, it was recommended that policy makers should include the use of bilingual mode of instruction in policy formulation for basic schools. 1 results 1
- It is widely known that formal learning is best experienced in the confinement of classroom environment. Educational and other related activities were mopped together because of homestay induced by COVID-19 pandemic, resulting in remote teaching-learning mode and manipulations of computers and the internet which were alien to some undergraduates and lecturers. The study therefore, examined the influence of Homestay, Socio-Economic Status and Computer Literacy on Undergraduates' Learning Attitude during Covid-19 Pandemic's Induced “Pedagogical Restructuring’’ in the University of Ibadan. Ex-post facto design ofcross-sectional study and multi-stage sampling techniques guided the study. Five faculties, 20 departments, 30 Economics, 400 undergraduates and 30 teachers were randomly selected for the study. Three research questions and three validated instruments-Depression, Anxiety and Stress Scales (r = 0.85), Undergraduates' SocioEconomic Status and Computer Literacy Scale (r = 0.75), Attitude to Learning Scale (r = 0.70), were used in the study. Data obtained were analysed using descriptive statistics and multiple regression at 0.05. Results revealed that most respondents experienced one psychological trauma during COVID-19 pandemic homestay. Further finding showed that independent variables were reliable predictors of undergraduates' attitude to learning during COVID-19 pandemic homestay (F(2.396) =9.470, p<0.005). Computer literacy made the highest contribution to the students' attitude to learning (β = 1.91, t = 3.815, p<0.05), followed by experiences of the undergraduates (β = .159, t = 3.174, p<0.05). The paper recommends that the University of Ibadan management should consider the socio-economic status of its undergraduates before advancing into individual differences', sensitive educational event such as adoption of online platforms during COVID-19 pandemic. 1 results 1
- Learning- attitude 1 results 1
- Newspapers 1 results 1
- Nigeria 1 results 1
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