Evaluation of Level of Service of Traffic at Major Road Intersections in Ibadan, Nigeria

Transportation has been of immense benefits to the social, economic and political development of communities, however, it is sometimes characterised with negative impacts such as traffic congestions, delays, environmental pollutions and crashes. In this study, the level of service of selected major road intersections in Ibadan were investigated. Traffic volume of each intersection approach was conducted from 7am - 7pm on Mondays, Wednesdays and Saturdays, delay studies were carried out during the morning, afternoon and evening peak hours and level of service for each approach was determined from the average delay per vehicle. The traffic volume reveals that passenger cars are the predominant vehicles at all the approaches and the morning and afternoon peak hours occurred between 8 to 9am and 2 to 3pm, respectively. The level of service for all the approaches is B, indicating slight reduction in capacity of the intersections. Keywords: Transport, Traffic volume, Traffic delay, Traffic congestion and Road intersection DOI: 10.7176/JIEA/9-7-05 Publication date: December 31st 201

On Robust Estimation through the Use of Auxiliary Information by Ratio and Regression Estimators

The ratio and regression estimators that make use of auxiliary information for achieving higher efficiency is applied to education data. Education is critical to our development as individuals and as societies, and it paves the way to a successful and productive future. It provides the potentials for an individual’s intellectual growth and productivity in the society. The objective of this paper is to estimate the ratio of pupils to classroom in Nigeria’s public primary schools as well as to estimate the total pupil population in Nigeria’s public primary schools using the ratio and regression estimators. The data of annual enrolment into public primary schools and the number of classrooms in 2014 were obtained from Universal Basic Education Commission.  Furthermore, the sampling design used is stratified random sampling with equal allocation. Two states were selected from each geo-political zone; making a sample of 12 states The results of the ratio estimator revealed that the estimated national pupil-classroom ratio is approximately 54 and the confidence interval shows that the ratio may lie between the inter 43 and 65 approximately. Similarly, total pupils population is estimated at 20,298,309 and the confidence interval shows that the total population may lie between the inter 16,084,553 to 24,512,065 approximately. The ratio and regression estimators will save time and cost to give reliable estimates. Similarly, using the regression estimator total pupils population is estimated at 20,412,402 and the confidence interval shows that the total population may lie between the inter 16,210,204 to 24,614,600 approximately. Based on this analysis, it is therefore recommended that effort should be intensified to improve the pupil-classroom ratio nationwide and to increase pupils’ enrolment. Key words: Bias, Enrolment, Coefficient of Variation, Confidence interval, Ratio estimation, Regression estimation Robust estimates, Standard error, Variance Abbreviations: EFA - Education for All, UBE - Universal Basic Education, SRS – Simple Random Sample, UNESCO-United Nations Educational, Scientific and Cultural Organizatio

Assessment of runway excursion causal factors and mitigation strategies

Runway excursion (RE) is a significant cause of many aircraft accidents worldwide. Statistic reveals that accident associated with RE is on the increase. Although RE accident fatalities are usually lower with respect to loss of control (LOC) caused accidents, however the aircrafts involved in RE caused accidents are usually write-off. In response to the raising threat to aviation safety, the Research and Development (R&D) division of the Air Force Institute of Technology (AFIT), Nigerian Air Force (NAF) Base, Kaduna Nigeria was tasked to conduct a study on RE problem. The study gathered of three kinds of secondary information associated with RE accidents: 1) statistical summaries, 2) accident report that cited runway excursion accident and 3) stakeholders inputs. Using this resources, the RE causal factors were identified. This paper described the study method, stakeholder viewpoint; key identified causal factors for RE caused accidents and mitigation strategies.Keywords: Aircraft accident, causal factor, runway excursion, mitigation strategie

Indigenous Angiosperm biodiversity of Olabisi Onabanjo University permanent site

The conservation of the genetic variability of the indigenous angiosperm community is a sine qua non. A survey of indigenous angiosperm biodiversity of the Olabisi Onabanjo University permanent site was undertaken. Plants collected were dried, poisoned and mounted on herbarium sheets, proper identification and confirmation in recognized herbaria were carried out. A total number of one hundred and thirty-eight (138) plant species belonging to fifty-five (55) families were collected. Of these, one hundred and twenty-seven are dicotyledons and eleven are monocotyledons. Leguminosae is the largest family with thirteen plants followed by Rubiaceae with eleven and Euphorbiaceae with nine plants. Trees were found to have significantly contributed to the ecosystem with a total number of fifty-four species, while forty-three of shrubs were recorded, climbers ten, herbs twenty-eight, grasses and sedges three. From this study it is obvious that the University permanent site is not only rich in plant biodiversity but also very rich in socio-economic values. Consequently it is highly advisable that a representative sample of this vegetation is protected for posterity so that all the indigenous plants of the study area may not be lost to the development projects embarked upon by the University.African Journal of Biotechnology Vol. 4 (6), pp. 554-562, 200

Adequacy of Technical Facilities for Maternal Health Care Delivery in Public Secondary and Tertiary Facilities in Osun State, Nigeria

Nigeria has one of the highest maternal mortalities and morbidities in the world, and the need to address these challenges continues to engage the attention of relevant stakeholders but very little attention has focused on technological resources within the maternal health research agenda. This study aims to identify and determine the adequacy of the key equipment for emergency obstetric care (EmOC) services in public-sector secondary and tertiary health facilities in Osun State, Southwest, Nigeria. Using a two-stage probability sampling procedure, 7 health facilities based in 6 randomly selected Local government areas (LGAs) were involved in the study. Data were obtained through the use of primary and secondary sources. For primary sources, a questionnaire was administered to 112 health workers and the study also utilized a checklist for equipment inventory. For secondary sources we reviewed existing hospital records on technology acquisition and maintenance. Relevant descriptive and inferential statistics were used for the data analysis. Almost three-fifths (58.1%) of the health workers considered the technical facilities for the delivery of EmOC in their facilities as inadequate, the proportion of health workers with such opinion was significantly higher in secondary compare to tertiary facilities (60.0% vs 40.0%, p=0.003). The inventory review and use of the checklist also showed varying degree of inadequate technical facilities; none of the facilities had all the 26 equipment considered as essential for comprehensive EmOC in functional state. We concluded that the public sector facilities in Osun State have inadequate technical facilities for EmOC; addressing this technological challenge will be critical to improving maternal health outcomes and statistics in Nigeria

From ‘Vagabonds’ to Ethnobotanical Relevance: Weeds of the Campus Sites of Olabisi Onabanjo University, Ago-Iwoye, Nigeria

A survey of the weed flora of the campus sites of the Olabisi Onabanjo University was undertaken. Several visits were made to the disturbed and undisturbed vegetation of the sites for collection of weeds after which the weeds were prepared in accordance with conventional herbarium practice. A total of seventy-three (73) weed species belonging to twenty-seven (27) families were identified and found to be present within the area of study. The family Poaceae seems to have the highest number of weed species (twelve) available within the area followed by Asteraceae with ten (10) species. Amaranthaceae, Cyperaceae and Euphorbiaceae are also in abundance. These weeds have been discovered to be useful, against the mindset of the uninformed that they are useless or ‘vagabond’ plants. Medicinal uses as well as percentage occurrence of each family are presented. From this study it is obvious that the University sites are not only rich in plant biodiversity but that the plants are also very rich in socio-economic values. It is therefore advisable that these plants should be protected from going into extinction so that all would not be lost due to developmental activities

FAMILY COMMUNICATION ON HIV / AIDS AMONG SECONDARY SCHOOL STUDENTS IN A NORTHERN STATE OF NIGERIA

Most Adolescents in Nigeria, like many others in Africa, are potentially at risk for contracting HIV through unprotected sexual intercourse. Yet the issue of how to help youth avoid risky sexual behaviour through family communication / education on HIV/AIDS is still of serious arguments within the society. This study examines the practice of family communication on HIV / AIDS among secondary school students. A descriptive study using 420 secondary school students selected by multi-stage random sampling was done. Self administered semi-structured questionnaire was used to collect relevant data. Only 48 (12.1%) reported family as the first source of information. However, most of the students 315 (79.7%) had family communication on HIV/AIDS with their family members. There is a gender difference in practice of family communication. Significantly higher proportion of the female students had family communication more than their male counterparts. The educational status of the parents significantly determined whether or not a student had family communication on HIV/AIDS. There is considerable level of family communication in the study population which should be encouraged further to cut across all members of the family

Solanecio biafrae: An Underutilized Nutraceutically‑Important African Indigenous Vegetable

Solanecio biafrae (Olive and Hierne) C. Jeffrey (1986) (Family: Asteraceae), has synonyms Senecio biafrae Olive and Hierne (1877) and Crassocephalum biafrae (Olive and Hierne) S. Moore (1912). It is a perennial standent, underutilized African indigenous medicinal vegetable. It was first reported and published in Flora of Tropical Africa. Its common names varied from Gnanvule in Cote d’Ivoire to Worowo/bologi in Nigeria. It has alternate, simple, succulent, petiolated, and exauriculate leaves. Its propagation is vegetative by rooting of cuttings. However, there is no report on its propagation by seed. It is ubiquitous in cocoa plots in Nigeria, especially southwest; due to deliberate protection for economic revenue, but this has little‑uncoordinated cultivation indication. These deliberately protected few are exposed to contamination by a chemical used for protecting cocoa plants. It is highly nutritive and rich in protein. It is also medicinally important as a galactagogue and for treatment of diabetes, high blood pressure, and infertility. It has biological activity against Staphylococcus aureus and Escherichia coli. It also has traditional and cultural claims for initiation and rituals. Personal interviews and search of the available literature on S. biafrae in electronic peer‑reviewed English journals using scientific databases such as Google Scholar, Science Direct, PubMed, Scopus, and Web of Science was employed

Bird tolerance to humans in open tropical ecosystems

AbstractAnimal tolerance towards humans can be a key factor facilitating wildlife–human coexistence, yet traits predicting its direction and magnitude across tropical animals are poorly known. Using 10,249 observations for 842 bird species inhabiting open tropical ecosystems in Africa, South America, and Australia, we find that avian tolerance towards humans was lower (i.e., escape distance was longer) in rural rather than urban populations and in populations exposed to lower human disturbance (measured as human footprint index). In addition, larger species and species with larger clutches and enhanced flight ability are less tolerant to human approaches and escape distances increase when birds were approached during the wet season compared to the dry season and from longer starting distances. Identification of key factors affecting animal tolerance towards humans across large spatial and taxonomic scales may help us to better understand and predict the patterns of species distributions in the Anthropocene.</jats:p