A Comparative Study of Positive and Negative Factorials

This paper present a comparative study of the various types of positive factorial functions, among which include the conventional factorial, double factorial, quadruple factorial, superfactorial and hyperfactorial. .............

How well Nigerian radiographers adhere to pediatrics-specific protocols during computed tomography procedures

INTRODUCTION: Enormously high-dose procedures such as computed tomography requires pediatrics-specific protocols due to high tissue radio-sensitivity and higher lifetime attributable cancer risks. It’s not known if radiographers in Nigeria consider this fact at all times.This work aimed to survey head computed tomography dose in Nigeria for evidence of pediatric- specific practice. METHODS: The census of CT scanners was undertaken prospectively across the country from June 2019 to September 2021, while the dose survey was undertaken retrospectively in 14 facilities distributed evenly across the geopolitical zones between February to September 2021. Data on computed tomography installations were supplied by radiographers spread across the country. A dose survey involving 490 and 700 pediatrics and adult patients emanated from fourteen of those facilities. Doses were extracted from on-screen volumetric CT dose index (CTDIvol) and dose- length product (DLP) in non-contrast investigations. RESULTS: There were 209 CT scanners installed in Nigeria as of September 2021, with a triennial growth rate of 12.4% (n = 26). Monthly patient throughput for all CT requests was ≤ 41,412 with pediatric cases accounting for 10.4 % (n = 4,311). Mean head dose for pediatrics and adults with CTDIvol (41/58 mGy) and DLP (922/1198 mGy-cm) appeared different prima facie. However, a paired - sample t-test gave statistically significant difference in the CTDIvol (p = 0.001), but not with DLP (p = 0.055). CONCLUSION: The installation of CT scanners is on the increase in Nigeria. Pediatric and adult CT dose had minimal differences. Given the higher lifetime attributable cancer risks for pediatrics, this should be worrisome. This calls for pediatric- specific protocol design and enforcement by relevant regulatory agencies, as well as meticulous optimization of protection from radiation by radiation practitioners

Stability Analysis of Model Regenerative Chatter of Milling Process Using First Order Least Square Full Discretization Method

Regenerative chatter is an instability phenomenon in machining operation that must be avoided if high accuracy and greater surface finish is to be achieved. It comes with its own consequences such as poor surface finish, low accuracy, excessive noise, tool wear and low material removal rate (MRR). In this paper, an analytical method base on first order least square approximation full-discretization method is use for the stability analysis on the plane of axial depth and radial depths of cut. A detail computational algorithm has been developed for the purpose of delineating stability lobe diagram into stable and unstable regions using mathematical models. These algorithms enabled the performance of sensitivity analysis. From the results axial depth of cut enhances the unstable region and suppresses the stable region. This means that inverse relationship exists between the axial and limiting radial depths of cut thus highlighting the need to determine the maximum value of their product for achieving maximized MRR thereby reducing the chatter in the milling process. It is also seen that the peak radial depths of cut occasioned by the lobbing effects occur at fixed spindle speeds irrespective of the axial depth of cut. Similarly, the rise in spindle speed enhances the stable region and suppresses the unstable region. This means that for us to have chatter-free milling process, parameters like axial and radial depths of cut should be carefully selected together at high machining speed. With these behaviour, one can locate the productive spindle speed at which the lobbing effects occur and depths of cut combination for the operator

Antioxidant and antimicrobial evaluation of the methanol leaf extract and fractions of dacryodes klaineana pierre (burseraceae)

ABSTRACT. Dacryodes klaineana is used in traditional medicine for the treatment of painful menstruation; tachycardia and cough. The study aims to evaluate the antioxidant and antimicrobial properties of the plant. The extract and fractions of D. klaineana were screened for their antioxidant effects using the 2,2-diphenyl-1-picrylhydrazyl (DPPH), ferric reducing antioxidant power (FRAP), and the total phenolic contents (TPC) assay methods. The antimicrobial activity of the plant was evaluated using the agar diffusion method against four different bacterialstrains (Staphylococcus aureus, Bacillus subtilis, Escherichia coli and Pseudomonas aeruginosa) and two fungi strains (Aspergillus niger and Candida albicans). The crude methanol extract (MLE), hexane fraction (MLHF), ethyl acetate fraction (MLEF) and butanol fraction (MLBF) produced dose-dependent antioxidant activity using DPPH and FRAP assays. The antioxidant activity of MLEF was comparable to the standard drug, ascorbic acid. MLEF also gave the highest content of total phenol content with a percent gallic acid equivalent of 100.68 ± 1.17 mg GAE/g. The extract and fractions were active against the bacteria species, but inactive against the fungi species. The study demonstrated that the antioxidant and antimicrobial potentials of D. klaineana may offer a promising source of new antioxidants and antimicrobials in the ethnomedicinal management of diseases.                 KEY WORDS: Medicinal plant, FRAP, TPC, DPPH, Antioxidant, Dacryodes klaineana   Bull. Chem. Soc. Ethiop. 2022, 36(1), 85-94.                                                                   DOI: https://dx.doi.org/10.4314/bcse.v36i1.8                                                       &nbsp

HIV/AIDS knowledge and attitude towards people living with HIV/AIDS (PLWHA): a cross-sectional study of primary school teachers

Background: Teachers are in advantage position to propagate correct information with regard to HIV/AIDS thereby influencing attitude towards PLWHA. With correct information stigmatization leading to spread of the scourge might be prevented. Aims & Objectives: The study was conducted to determine knowledge and attitude of primary school teachers towards PLWHA. Methods & Materials: The cross-sectional survey was used to study a sample of 400 primary school teachers in Ebonyi State, Nigeria. The instrument used for data collection was researchers\u2019 designed questionnaire. Out of 400 copies of questionnaire administered; 394 representing 98.5% return rate, were used for analysis of data. Results: Results showed respondents had moderate (57.4%) knowledge concerning HIV/AIDS and positive attitude (3.09 \ub1 0.98) to PLWHA. Female teachers\u2019 dispositions to PLWHA were better than the males based on their attitude scores and the difference was not significant in general knowledge of HIV/AIDS and attitude to PLWHA. Conclusion: Our findings underscore the need for a universal health education programme, focusing on HIV/AIDS education, in education institutions that train teachers in Nigeria so as to possibly mitigate the discrepancy in knowledge regarding curability of AIDS and any undesirable attitude towards PLWHA that may arise among teachers

Epidemiology of Injuries in the Radiology Department of a Teaching Hospital

Background: Injury has become a public health problem all over the world, and it is associated with high morbidity and mortality. Objective: This paper focuses on determining the epidemiology of injuries in the Radiology Department of Nnamdi Azikiwe University Teaching Hospital, Nnewi. Method: A retrospective research design was adopted for this study. Request forms of patients were collected from the register in the department. Five hundred and twenty (520) request forms were collected but twenty one (21) were excluded because they did not contain sufficient information needed for the study. The picture and archives communication system (PACS) was also utilized to ensure that information obtained from the register corresponds with the patients who took part within the period of the study. Data was analyzed descriptively using SPSS version 20. Results were presented in frequency tables and percentages. Results: The injuries involved 376 (75.2%) males and 123 (24.8%) females. Road traffic accident accounted for 67.5%, and it was the most occurring injury. Injuries due to fighting accounted for 2 (0.4%), which was the least occurring. Most injuries (18.8%) occurred within the age range of 21-30years, which was closely followed by the age range of 31-40 years (18.2%). Majority of the injuries involved the whole spine (18.5%), which is also followed by chest injuries (18.2%). Conclusion: The injuries recorded involved many body parts and more males than females were affected. Road traffic accident was the major cause of the injuries

Maternal death and obstetric care audits in Nigeria: A systematic review of barriers and enabling factors in the provision of emergency care.

Acknowledgements We would like to thank Yutaka Osakabe for co-ordinating the retrieval of full text articles. The John D. and Catherine T. MacArthur Foundation supported this study, grant number 12-100074-000-INPPeer reviewedPublisher PD