Work specification for the construction of 33kv overhead lines across a lagoon using equal level dead-end lattice tower supports

Bare overhead distribution conductors are typically flexible and uniform in weight along their lengths. This weight causes the span to form a catenary (sag) which changes with conductor temperature, ice, wind loading and time. This catenary is capable of tripping circuits because it often results to short circuit and da mage power system equipment with attendant loss of revenue to utility company. This paper presents a case study of 33kV overheadline construction crossing a 200m wide ‘Lagoon’ which requires minimum sag - tension design and estimation of Dead - End Lattice To wer weight specification that would determine weight of Tower foundation. These two parameters were obtained using the standard mathematical equations and the specifications for Aluminium Conductor Steel Reinforce (ACSR). The results of various Parameters evaluated in this research work are presented and discussed. The Sag and Tower weight results were applied to the proposed project which was successfully completed and commissioned. Keywords : Aluminium Conductor, Catenary, Dead-End, Lattice Tower, Tripping Circuits, Parameters, Overhead Lines, Sag - Tension, Tower Weight, Tower Foundation, Steel Reinforce, Specifications

Development of an improved earthing method for power and distribution transformers substations

Engineers and planners have realized that equipment grounding is a necessary part of installation process in Electrical power substations. Over years, grounding or earthing has been carried out primarily through preparation of Earth Mat which is interconnected with several Earth-rods buried around the equipment under consideration. This approach takes several efforts to have an acceptable and reliable result. However, this paper presents a more flexible, economical and results oriented approach. A flow chart which describes the procedures of carrying out the proposed method of earthing is developed. This was applied to two case studies: a proposed Power transformer substation and distribution Transformer substation located within the same geographical domain. On the two cases, the measured earth resistances are presented and discussed. The results from the case study indicates that the earth resistance values obtained from this new approach are reliable and in compliance with IEEE Standards 80,142, 81 and 1100.Keywords: Equipment, Grounding, Earthing, Earth-rod, Flowchart, Earth Mat, Flow Process, Injection Substation, Distribution Substation, Earth Resistance, IEEE Standard

COTTON FARMERS’ PERCEPTION ON CLIMATE CHANGE AND ADAPTATION STRATEGIES IN OGUN STATE, NIGERIA

Climate change has been a major threat to agriculture in Nigeria. This study was carried out in Imeko Afon Local Government Area. Purposive selection of all practicing cotton farmers (54) at the time of survey was made from the study area. The mean age of respondents is 56years. The household size is 7persons and the average annual income is N9, 972.00k. The mean score of famers’ perception about the climate change and its effects on cotton production is 2.62. Farmers’ stated that there is an increase temperature due to change in climatic condition (Ẍ= 3.45, S.D ± 1.152), and fluctuation in rainfall pattern (Ẍ= 4.04, S.D ± 0.999). Adopted coping strategies to cushion effects of climate change include; increase use of agro-chemicals (Ẍ = 3.35, S.D ± 0.677), integrated weed pest management (Ẍ = 3.44, S.D ± 0.839) and application of fertilizer to improve the depleted soil nutrients (Ẍ = 3.19, S.D ± 0.646). Results indicates a significant relationship between respondents perceived effects on climate change and coping strategies (r =0.890**, P< 0.05). The study recommends that government agricultural and meteorological agencies should provide timely information to farmers on the climate and means of ameliorating the effects of climate change.     &nbsp

Determinants of utilisation of traditional birth attendant services by pregnant women in Ogbomoso, Nigeria

Background: This study was designed to assess the determinants of utilization of Traditional Birth Attendants (TBAs) services by pregnant women in different communities in Ogbomoso, Nigeria.Methods: This was a community- based cross-sectional study. Fisher's formula was used to calculate the sample size and a total of 270 eligible pregnant women were enrolled for the study using multistage sampling technique. Data was collected using pretested structured interviewer-administered questionnaire. Data analysis was done using SPSS version 20 and results were presented in frequencies and percentages.Results: Factors found to have a significant influence on the utilization of TBA services in this study include: low educational status (p <0.001), lower socioeconomic status (p <0.001), and compassionate care given by the TBAs (p=0.004). Other factors include service proximity and lower cost of TBA services.Conclusions: The impact of TBAs and their services cannot be overemphasized in the present state of maternal and child health in Nigeria.  Lower educational status among others has been found to be a strong predictor of utilization of TBA services. There is, therefore, the need to improve the educational and socioeconomic status of women in order to allow them to access quality health care services that will safeguard their well-being. Inculcating compassionate care into orthodox healthcare delivery will go a long way to improve patronage and discourage TBA utilization

A 5‑year audit of diagnostic gynaecologic laparoscopy under conscious sedation at the University College Hospital, Ibadan

Introduction: Diagnostic laparoscopy affords smaller incisions, shorter recovery time, and fewer complications. In developing countries, access is limited by cost, infrastructural deficit, and expertise. In a bid to reduce cost at our center, conscious sedation for diagnostic laparoscopy was introduced as far back as 1980. We present here a 5‑year audit of our outpatient diagnostic laparoscopy highlighting the various indications, findings, and complications observed. Methodology: A retrospective review of case files of patients who had diagnostic gynecological laparoscopy between 1st January 2011 and 31st December 2015. The retrieved case files had data extracted and analysed using the Statistical Package for Social Sciences version 20 (Chicago IL USA). Data was presented as simple percentages using tables and figures. Results: During the period, 1,329 outpatient gynecological procedures were performed with 207 diagnostic gynecologic laparoscopies (15.6%). Only 187 case notes were retrieved (retrieval rate of 90%). The mean age was 33.04 (±5.2) years, 84.5% (158) had post‑secondary education, and 69.0% (129) were nulliparous. Majority, 131 (70.0%), had laparoscopy and dye test, 26 (14.0%) had laparoscopy alone, and 30 (16.0%) had a combination of laparoscopy, dye test, and hysteroscopy. The commonest indications were secondary infertility (51.9%), primary infertility (24.1%), and chronic pelvic pain (11.2%). Common findings at laparoscopy were pelvic adhesions (53.5%), uterine fibroids (35.1%), and bilateral tubal blockage (30.3%). Normal findings were reported in only 19 patients (10.3%). Conclusion: Diagnostic laparoscopy under conscious sedation is cost‑effective and safe. It has very minimal complications when performed by skilled personnel. It is thus recommended for low resource settings with the view to avail low income patients the opportunity for endoscopic evaluation.Key words: Audit; conscious sedation; diagnostic laparoscopy; low income

Effect of Weed Control Methods and Canopy Characteristics on Weed Biomass, Yield and Yield Components of Two Contrasting Cassava Varieties in the Rainforest Zone of Nigeria

Weed infestation is one of the reasons why the average cassava yield is low in Nigeria. This study was conducted in 2010 at the Teaching and Research Farm, Obafemi Awolowo University, Ile-Ife to evaluate the impact of different cassava canopy structures on (i) weed biomass and (ii) yield and its components. The treatments consist of hand-weeded, herbicidal treatment, and unweeded checks in the main plot. The sub-plots constituted the cassava cultivars (TMS 30572 and TME 1) laid out in a randomized complete block with a split-plot arrangement in three replications. TMS 30572 reduced weed biomass by 59% when compared to TME 1 in the unweeded plot. However, there was no significant difference in the weed biomass between the hand-weeded and herbicide-treated where TMS 30572 and TME 1 were cultivated. Root dry matter of TMS 30572 was higher by 72% when compared to TME 1 in the untreated field. However, there was no significant difference between the yield of TMS 30572 and TME 1 in both hand-weeded and herbicide-treated plots. In conclusion, TME 30572 is recommended for cultivation in regions with similar agroecological patterns coupled with Integrated Weed Management (IWM) especially, when planting TME 1 to obtain optimum yield. Keywords: Weed biomass, TMS 30572, TME 1, Yield, and Integrated Weed Management. DOI: 10.7176/JNSR/12-14-05 Publication date:July 31st 202

Abdominal myomectomy: A retrospective review of determinants and outcomes of complications at the University of Ilorin Teaching Hospital, Ilorin, Nigeria

Background: The aim of this study was to describe the pattern, outcomes, and determinants of perioperative complications of abdominal myomectomy at the University of Ilorin Teaching Hospital, Ilorin, Nigeria.Methods: This was a retrospective review of cases of abdominal myomectomy between January 2010 and December 2013. Data were obtained from ward and operating theatre case records and analysed using SPSS version 20. The continuous variables were analysed with Student’s t-test. The categorical variables were analysed with the chi-square test. P-values of 0.05 or less was taken to be significant.Results: Total sampling yielded 204 cases, of which 170 records (80%) were adequate for analysis. Using criteria developed by Garry et al., major and minor complications occurred in 43.6% and 32.9% of procedures, respectively, while 23.5% of the patients had no complications. The commonest complication was intraoperative haemorrhage requiring blood transfusion. Mean estimated blood loss was 630.88 ± 392.42 mL. There were no cases converted to hysterectomy, and no deaths were recorded. Uterine size equivalent to 16 weeks’ gestation or more was significantly associated with heavier blood loss, blood transfusion, and fever (P = 0.034). Other significant determinants of major intraoperative haemorrhage with or without blood transfusion were menstrual flow of 6 days or more, preoperative anaemia, previous surgery, posterior incision, and surgery duration longer than 4 hours (P &lt; 0.05).Conclusions: Outcome of abdominal myomectomy is generally favourable even if uterine size is greater than 16 weeks by palpation. Nevertheless, patients should be counselled preoperatively on the risk of blood loss and the possibility of blood transfusion

Applications of Space Technology for Accelerated Infrastructures Development for Rural Areas Development in Nigeria

Rural to urban migration still persists in Nigeria despite government’s claim of rural development programs. This situation if not checked portends negative signal for the already over-populated urban areas, particularly in areas of food security, sanitation, housing, crimes, etc. The development of rural areas is measured by the availability of infrastructures and economic opportunities that are available to the people. These infrastructures include: transportation infrastructure, educational infrastructure, healthcare infrastructure, energy infrastructure, water supply/sanitation infrastructure, information and communication technology (ICT) infrastructure and so on. Rural areas in Nigeria urgently require accelerated infrastructure development to alleviate poverty. When this is done rapid growth is ensured and poverty is drastically reduced. The world today has become increasingly reliant on information and communication technologies (ICT) and with it comes the need for societies and communities to stay connected and be integrated into the global information super highway. Space technology today has also become an integral part of global information infrastructure, connecting people across the world and serving communications needs of governments, businesses and individuals. For Nigeria to be technologically developed, the “digital divide” (that is the imbalance between urban and rural dwellers in which the rural dwellers have far lesser access to the same quality of knowledge), information, and education resources that are more readily available to urban areas because of the absence of required communication infrastructure need to be removed. The digital divide brings a virtual, but real impediment to the advancement of the society and individuals in remote rural settlements. This paper seeks to discuss the applications of space technology for accelerated rural infrastructures development in rural areas in Nigeri

Periodicity, Stability, and Boundedness of Solutions to Certain Second Order Delay Differential Equations

The behaviour of solutions to certain second order nonlinear delay differential equations with variable deviating arguments is discussed. The main procedure lies in the properties of a complete Lyapunov functional which is used to obtain suitable criteria to guarantee existence of unique solutions that are periodic, uniformly asymptotically stable, and uniformly ultimately bounded. Obtained results are new and also complement related ones that have appeared in the literature. Moreover, examples are given to illustrate the feasibility and correctness of the main results

ICT AS A CHANGE AGENT FOR QUALITATIVE HIGHER ADULT EDUCATION IN NIGERIA: A CASE STUDY OF OYO STATE

This study appraised the role of Information and Communication Technology (ICT) as a change agent in qualitative higher adult education programmes in Oyo State. It identified the available ICT facilities, determine the extent of utilization of ICT and ascertain the strategies for practical use and implementation of ICT for such programmes. Three research questions and hypotheses guided the study with a descriptive survey design and a questionnaire as a data collection instrument. Four experts in the field validated the instrument while data generated and collated was tested using the Cronbach statistics. The overall reliability score of the instrument's rating was 0.908. Findings showed that the identified ICT facilities available, as well as their extent of utilization in these programmes for higher adult education programmes, were accepted as being appropriate. Similarly, the strategies adopted for the effective implementation and use of ICT in higher adult education programmes in the State were considered suitable for the application