Thermodynamic optimization tools for power tracking in a multistage concentrated solar power Rankine plant

Abstract: The object of the study is to present a method of thermodynamic optimization of power generating plants, in a mode that consolidates and simplifies the analysis of data on heat-work interaction of the plant components. The optimization scheme identifies the technical and process parameters that can improve the thermodynamic performance of the plant with respect to an objective variable, and further, the required thermodynamic measures necessary to improve the operating condition of the plant. Simple but effective tools are used to evaluate the optimal and suboptimal power generating capacities vis-à-vis the fundamental variables—namely, the thermodynamic quantity ratio (TQR) and the power-energy quantity ratio (PQR)—without routing optimization procedures. Beyond the optimal value of the objective variable, the power generation capacity of the plant is affected. The determination of the optimal value of the objective variable can also be approached by computerization; for fixed prescriptions of the boiler, superheater, and turbine parameters, variables such as boiler pressure and temperature can be optimally selected. DOI: 10.1061/(ASCE)EY.1943-7897.0000367. © 2016 American Society of Civil Engineers

Coping Strategies of Teenagers with Bereavement of Parent in Nnewi, Anambra State Nigeria

This study focused on how teenagers cope socially with bereavement of parent. Two research questions and two hypotheses guided the study. The design used was descriptive survey. A sample of 393 (155 males and 238 females) aged between 12-19 years was selected purposively from Secondary Schools in Nnewi Education Zone of Anambra State, Nigeria. The researchers designed questionnaire “Coping with bereavement of parent by teenagers (CBPT)” was validated and used for collecting data. The data was analyzed using mean, standard deviation and t-test. Some social coping strategies such as were identified. Age and gender did not make any significant difference in the teenagers’ choice of coping strategies. It was recommended that school counsellors expose bereaved teenagers to different strategies of coping socially with bereavement of parent. Keywords: Bereavement, Parent, Teenagers, Social, Coping Strategies

Complications following nasotracheal intubation using cuffed polyvinyl chloride tube: a prospective cross sectional study

Background: To examine the complications following nasotracheal intubation by documenting the nasal traumas observed with the use of untreated cuffed polyvinyl chloride tube in unprepared nostrils.Methods: Patients who had maxillofacial surgeries under general anesthesia, muscle relaxation and nasotracheal intubation were included in the study. Nasotracheal intubation was carried out after induction of anesthesia was effected with intravenous propofol and suxamethonium by an Anesthetist using well lubricated cuffed polyvinyl chloride tube. Sizes 6.0, 6.5 and 7.0mm were inserted in females while sizes 7.0 and 7.5mm were inserted in males. Occasionally, the natural curve of the tube guides it through the cords without the aid of Magill forceps. Anterior rhinoscopy was performed by otolaryngologist 24 hours after surgery. Results were subjected to statistical analysis.Results: Sixty four patients were included in the study. They were between the ages of 21 and 63 years (mean 33.2 ± 14.1 years); they were 39 males and 25 females. The most frequently used nasotracheal tube (NT) was size 7.0mm internal diameter. Epistaxis was noticed in 52 (81.2%) patients. There were no statistically significant differences in the incidence of epistaxis observed in males and females, and also between right and left nostrils. A total of 46.8% of nasal trauma were inferior turbinate trauma involving the inferior medial aspect.Conclusion: The use of untreated cuffed polyvinyl chloride tube for nasotracheal intubation in unprepared nostrils is associated with a high incidence of epistaxis and nasal trauma.Keywords: nasotracheal intubation, epistaxis, nasal traum

Sources and Functionality of Rural Water Supply in Communities from three Senatorial Zones of Imo State, Nigeria

Sustainability of domestic water access in communities is essential for good health, society’s dignity and progress. This study investigated the sources and functionality of rural water supply in nine communities of three local government area (LGA) in three senatorial zones of Imo State, Nigeria using structured questionnaires. The questionnaires were administered on 100 women in each community. Data obtained were analysed using multivariate analysis of variance (MANOVA) to reveal the frequency of using the various sources of rural water supply, and Wilcoxon’s test for matched pairs to reveal the functionality status of the most frequently used water source. The findings indicate the importance of borehole water facilities in these rural communities and the necessity for intervention programs to strengthen their functionality in tandem with the State’s aspirations in achieving sustainable development goals

An Instructional Package for the Development of Leadership Skills and Ethical Values among Youths in Post Basic Schools

The youths are a nation’s future manpower; the productivity and advancement of any nation depend heavily on the attitude and values they imbibe. The inculcation of desirable values and attitudes in our youths is both an informal and formal process. The Federal Government of Nigeria has made various efforts to provide formal training for Nigerian youths on social and civic values and leadership skills. However, there is a gap in these formal training attempts. Ethical value orientation is being included in the Basic Education and Civic Education in the tertiary level, but in the Post Basic Education where the youths are at their most vulnerable stage, there is no formal structure to assist them in learning the proper values. This instructional package is designed to fill this gap. The package consists of an instructional module, a teacher’s guide and some resources to accompany the training. The module is a simplified training course on positive ethical value orientation and good leadership skills to be used alongside the normal school curriculum in the second year of Post Basic Education. The course applies Instructional System Design to training for behavioral skills acquisition and attitudinal chang

GENDER AND LEVELS OF ATTAINMENT OF SCIENTIFIC LITERACY AMONG SCIENCE STUDENTS UNDER CONSTRUCTIVIST INSTRUCTIONAL MODEL

The study investigated levels of attainment of scientific literacy by junior secondary (8th grade) male and female students. Quasi-experiment of non- equivalent control group design was used. A total of 162 students were selected by purposive sampling of four coeducational schools out of twenty three in Ohafia Local Government Area, Abia state, Nigeria. In each of the four schools, an intact class was randomly selected. These were randomly assigned, two to experimental and control groups. Research questions were answered using mean and standard deviations and the hypotheses tested using ANCOVA. TOSL instrument for data collection had parts A and B. Reliability Coefficient of part A was established using Spearman rank order correlation and B using Kuder-Richardson formula 20(K-R). The internal consistencies were 0.69 and 0.72. The findings showed that constructivist instruction enhanced students’ attainment of scientific literacy irrespective of their sexes. Based on the findings recommendations were made

The Anti-Nutritional and Proximate Composition of Rain Tree (Samanea saman) Pod Samples

The anti-nutritional and proximate composition of pods of Samanea saman were determined. About 600g of wholesome, cleaned and dried pods were divided into two portions: one portion was ground as whole pod meal while the other portion was deseeded and ground as seedless meal. The removed seeds were ground separately as a sample to obtain three samples namely: whole pod, pulp and seed samples. Triplicate data obtained were subjected to One-Way ANOVA using SPSS software of version 21. Mean values and Fisher’s least significant difference (LSD) were determined for the separation of the means at (p≤0.05). The whole pod had 1.49mg/100g oxalate, 1.97mg/100g hydrogen cyanide, 0.71mg/100g tannins, 27.07mg/100g saponins, 0.51mg/100g flavonoids and 1.71mg/100g alkaloids, which were significantly(p≤0.05) different from that of pulp (1.89mg/100g oxalate, 1.51mg/100g hydrogen cyanide, 0.86mg/100g tannins, 28.46mg/100g saponins, 1.00mg/100g flavonoids and 1.41mg/100g alkaloids) and seed samples (1.39mg/100g oxalate, 1.61mg100g hydrogen cyanide, 0.56mg/100g tannins, 26.51mg/100g saponins, 0.49mg/100g flavonoids and 1.86mg/100g alkaloids). The moisture contents were pulp (19.30%), whole pod (15.50%) and seed (9.20%). Ash content were whole pod (4.70%), pulp (2.90%) and seed (2.60%); Ether extract of whole pod, pulp and seed were 3.31%, 2.52% and 2.66% respectively. The crude proteins were whole pod (13.21%), pulp (10.98%) and seed (21.55%); crude fibre of the plant were whole pod (15.95%), pulp (6.77%) and seed (8.47%). The whole pod had 47.33% carbohydrate which was significantly (p≤0.05) lower than the carbohydrate of pulp (57.53%) and seed (55.52%). The utilization of the pods of S. samana is a significant source of bioactive that if harnessed in the formulation of nutraceutical beverage could offer a whole lot of health benefit to the users

Physicochemical evaluation of groundwater near Ikot Effanga dumpsite, Calabar, South eastern Nigeria

The Ikot Effanga area of Calabar, Southeastern Nigeria, is located close to a municipal waste dump. The area is defined by latitudes 050001N and 050251N and longitudes 0080201 E and 0080251 E. The aim of the study was to assess the impact of the waste dump on the groundwater resources of the area. Groundwater samples were obtained from 10 boreholes located around the dump site. The samples were collected during the peak dry season and peak rainy season for comparison. Physicochemical parameters were analyzed. Static water level and surface elevation of the boreholes were used to determine the groundwater flow direction. Results obtained were compared with the NSDWQ and WHO standards. From the result, it was observed that groundwater in the area is acidic as the mean pH values were 4.03 and 3.57 for dry and wet season respectively. Other physicochemical parameters analyzed showed that there were no significant variations between the dry and wet season. Also, groundwater from the area was classified as fresh and suitable for domestic and agricultural purposes. The general flow direction of groundwater in the study area is NW-SE. While the present study showed that the dumpsite does not have significant impact on the groundwater resources either due to geology or natural attenuatio

Amputation‑Related Phantom Limb Pain in Nigeria: A Prospective Cohort Study

Background: Phantom limb pain (PLP) is a common and distressing complication of limb amputations. Literature on PLP in Nigeria and indeedAfrica is scant despite the high rate of amputations in published works. We sought to highlight the burden of PLP among Nigerian amputeesin order to improve awareness and care by health‑care providers. Patients and Methods: In this prospective cohort study, consecutive limb amputees were recruited and relevant data were collected by in‑person interview at 1 week postamputation and subsequently by telephone survey at 6 months and 12 months. The sociodemographic and clinical   information of the amputees were recorded, as well as presence of PLP and the treatment offered by the attending physician. The Chi‑square test of statistical significance and multivariate analysis using binary logistic regression were used in the analysis, and the level of statistical significance was determined by P < 0.05. Results: One hundred and fourteen consecutive limb amputations were carried out in 113 patients over a 1‑year period. The period prevalence of PLP was 63.6%, and of these, only 8.6% had this documented in their medical record. No predictor of PLP was identified in the cohort. Conclusion:  PLP is highly prevalent among limb amputees in our cohort. We call for improved awareness and practice relating to PLP among  health‑care providers and partners, considering the vast population of amputees in the region. Keywords: Africa, American Society of Anesthesiologists physical status grade, amputees, phantom limb pai

A Preliminary Study on the Diversity of Monkeys in Nnamdi Azikiwe University Awka and Its Environs

Monkeys are among the prominent animal species found in the Nnamdi Azikiwe University Awka forest areas and its environs; thus, a 3-month reconnaissance and transect survey was carried out to determine the diversity of these monkeys and the ecological features that support their abundance and distribution. Six sample sites designated ‘A’ to ‘F’ were carefully chosen, transected and closely monitored for monkeys’ presence. A total of 116 monkeys, all of the super- family Cercopithecoidae but of four different species were observed. A total of 47 Chlorocebus aethiops with a relative abundance of 40.5% was recorded, it was followed by 34 (29.3%) Chlorocebus sabaeus; 25 (21.6%) Chlorocebus tantalus; and the least is Erythrocebus patas, 10 in number and relative abundance of 8.6%. The distribution of each species in a given site showed that site A recorded the highest number of monkeys 55(47.4%),it was followed by site B with 21(18.1%)monkeys; then site E 16(13.8%); 11(9.5%) in F; 7(6.0%) in site C and the least is 6(5.2%) in site D. The Simpson’s index of biodiversity was 0.7