IN-SITU CHARACTERIZATION OF SURFACE QUALITY IN γ-TiAl AEROSPACE ALLOY MACHINING

The functional performance of critical aerospace components such as low-pressure turbine blades is highly dependent on both the material property and machining induced surface integrity. Many resources have been invested in developing novel metallic, ceramic, and composite materials, such as gamma-titanium aluminide (γ-TiAl), capable of improved product and process performance. However, while γ-TiAl is known for its excellent performance in high-temperature operating environments, it lacks the manufacturing science necessary to process them efficiently under manufacturing-specific thermomechanical regimes. Current finish machining efforts have resulted in poor surface integrity of the machined component with defects such as surface cracks, deformed lamellae, and strain hardening. This study adopted a novel in-situ high-speed characterization testbed to investigate the finish machining of titanium aluminide alloys under a dry cutting condition to address these challenges. The research findings provided insight into material response, good cutting parameter boundaries, process physics, crack initiation, and crack propagation mechanism. The workpiece sub-surface deformations were observed using a high-speed camera and optical microscope setup, providing insights into chip formation and surface morphology. Post-mortem analysis of the surface cracking modes and fracture depths estimation were recorded with the use of an upright microscope and scanning white light interferometry, In addition, a non-destructive evaluation (NDE) quality monitoring technique based on acoustic emission (AE) signals, wavelet transform, and deep neural networks (DNN) was developed to achieve a real-time total volume crack monitoring capability. This approach showed good classification accuracy of 80.83% using scalogram images, in-situ experimental data, and a VGG-19 pre-trained neural network, thereby establishing the significant potential for real-time quality monitoring in manufacturing processes. The findings from this present study set the tone for creating a digital process twin (DPT) framework capable of obtaining more aggressive yet reliable manufacturing parameters and monitoring techniques for processing turbine alloys and improving industry manufacturing performance and energy efficiency

Judicial Balacing of Parental Objection to Medical Treatment on the Basis of Religious Beleifs and Children Right to Life in Nigeria

Children being vulnerable, have special protection under the law through their parents or guardian who are responsible for them; and make decisions for them because they lack legal capacity. One of these decisions a parent/guardian makes is determining the religion of a child. Once the parent/guardian chooses the religion of the child, the child may become bound by its practices throughout childhood. While the right of parents to determine the religion of their children is recognised by domestic, regional and international laws, the way courts in Nigeria treat this recognition suggests that the right is not absolute. This paper adopts the doctrinal methodology in interrogating the extent to which Nigerian Courts permit the observation by a child of the religious practices of his/her parent in relation to submission to medical treatment in order to protect the child’s right to life. This paper argues that law and morality are media of social control but have their convergence and divergence. It further argues that sanctity of human life which for many forbids suicide, requires that even adults should not be allowed to object to medical treatment which refusal may result in death which can be seen as “disguised suicide.” These authors examined the Supreme Court decision in Medical Dental Practitioners Disciplinary Council v. Okonkwo and found that; Nigerian Courts recognise parent right to choose their children religion and practices however, any religious practice prejudicial to the child based on the “best interest” principle provided under the Child Right Act and its States equivalent will be jettisoned. It examines the practice in Britain and Canada and draw lessons for Nigeria. This paper recommends public enlightenment, prohibition of harmful religious beliefs such as objection to life-saving medical procedure by parents for minors as means of    balancing parents/guardian right to choose their children religious beliefs and preservation of the children right to life

Computationally Efficient, Multi-Domain Hybrid Modeling of Surface Integrity in Machining and Related Thermomechanical Finishing Processes

In order to enable more widespread implementation of sophisticated process modeling, a novel, rapidly deployable multi-physics hybrid model of surface integrity in finishing operations is proposed. Rather than modeling detailed chip formation mechanics, as is common in numerical models, the proposed models integrates existing analytical and semi-empirical models of the plastic, elastic, thermal and thermodynamic domains. Using this approach, highly complex surface integrity phenomena such as residual stresses, grain size, phase composition, microhardness profile, etc. can be accurately predicted in a manner of seconds. It is envisioned that this highly efficient modeling scheme will drive new innovations in surface engineering

Self‑reported Training Needs among Physicians in a Tertiary Institution, Southwest, Nigeria: An Application of Hennessy‑Hicks Training Needs Assessment Tool

Background: To keep pace with existing as well as emerging public and population health challenges, continuing in‑service professionaldevelopment (CPD) of physicians is paramount. This study assessed the training needs of physicians in a tertiary hospital in Ibadan, South‑West,Nigeria. Methods: This study utilized a descriptive cross‑sectional design. Three hundred and fifty‑five physicians were randomly selected. Data were collected with the aid of the Hennessy‑Hicks Training Needs Assessment tool. The instrument has five broad sub‑sections: Research/audit, communication/teamwork, clinical tasks, administration, and management/supervisory tasks. In all, these subsections are made up of 30 items with their roles/tasks and were used to assess the training needs of individual study respondents. Charts and proportions were utilized to present the CPD training needs reported by physicians. Mann–Whitney U test was used to examine the difference in training needs between consultants and resident doctors.  Results: A larger proportion of the study respondents were middle‑aged adults. Respondents’ ages were fairly distributed across the varying age brackets. Respondents within the age bracket 35–39 were the highest (30.36%), followed by those within ages 30–34 years (24.09%). With regard to training needs and capacity development, research/audit skills had the highest need (0.83). Furthermore, training that enhances   managerial/supervisory skills had a rating of 0.68. Clinical tasks and administration tasks have the same rating (0.63), whereas   communication/teamwork had the lowest rating. Consultants expressed higher training needs compared with resident doctors across all task domains. Conclusion: Quest for skills in research had the topmost priority among physicians, and thus, majority were likely to be receptive to training and acquisition of new skills. Future CPD training should reflect the critical needs for performance improvement, as indicated in this study. Keywords: Continuing Professional Development, Health-care, Hennessy‑Hicks Training Needs Assessment, Physicians, Nigeri

Characterization and Modeling of Surface Roughness and Burr Formation in Slot Milling of Polycarbonate

Thermoplastic materials hold great promise for next-generation engineered and sustainable plastics and composites. However, due to their thermoplastic nature and viscoplastic material response, it is difficult to predict the properties of surfaces generated by machining. This is especially problematic in micro-channel machining, where burr formation and excessive surface roughness lead to poor component-surface integrity. This study attempts to model the influence of size effects, which occur due to the finite sharpness of any cutting tool, on surface finish and burr formation during micro-milling of an important thermoplastic material, polycarbonate. Experimental results show that the depth of cut does not affect either surface finish or burr formation. A proposed new sideflow model shows the dominant effect of cutting-edge radius and feed rate on surface finish, while tool edge roughness, coating and feed rate have the most pronounced influence on burr formation. Overall, a good agreement between the experimental data and the proposed size effect model for the machining of thermoplastic material was found. Based on these results, tool geometry and process parameters may be optimized for improved surface integrity of machined thermoplastic components

Administration of Retirement in Nigeria: Periscoping the effect on Retirees

The main objective of this paper is to investigate the impact of financial performance on the value of Jordanian industrial firms, which are registered in Amman Financial Market (AFM). The sample of the study consists of (40) firms available on the AFM’s website. They represent 71.4% of the Jordanian industrial firms, during the period (2006-2015). Regression is used to test the study’s hypotheses. Tobin’s Q and operational efficiency indicators are used to measure financial performance (Gross profit and the operating expenses). The study reveals that there is a statistically significant impact of financial performance on the firms’ values. The study recommends that the firms’ management, stakeholders and investors should concern with using appropriate indicators to analyze financial performance that are developed by the researchers such as the operating efficiency indicators, in addition to TQ index. This is because measuring performance is important for forecasting firm’s value, and helps stakeholders in making appropriate decisions. Keywords: Financial Performance, Firm value, Tobin’s Q index, Gross profit, and the Operating costs

Validation of the Rome III criteria for the diagnosis of irritable bowel syndrome in secondary care

BACKGROUND & AIMS: There are few validation studies of existing diagnostic criteria for irritable bowel syndrome (IBS). We conducted a validation study of the Rome and Manning criteria in secondary care. METHODS: We collected complete symptom, colonoscopy, and histology data from 1848 consecutive adult patients with gastrointestinal symptoms at 2 hospitals in Hamilton, Ontario; the subjects then underwent colonoscopy. Assessors were blinded to symptom status. Individuals with normal colonoscopy and histopathology results, and no evidence of celiac disease, were classified as having no organic gastrointestinal disease. The reference standard used to define the presence of true IBS was lower abdominal pain or discomfort in association with a change in bowel habit and no organic gastrointestinal disease. Sensitivity, specificity, and positive and negative likelihood ratios, with 95% confidence intervals, were calculated for each diagnostic criteria. RESULTS: In identifying patients with IBS, sensitivities of the criteria ranged from 61.9% (Manning) to 95.8% (Rome I), and specificities from 70.6% (Rome I) to 81.8% (Manning). Positive likelihood ratios ranged from 3.19 (Rome II) to 3.39 (Manning), and negative likelihood ratios from 0.06 (Rome I) to 0.47 (Manning). The level of agreement between diagnostic criteria was greatest for Rome I and Rome II (κ = 0.95), and lowest for Manning and Rome III (κ = 0.59). CONCLUSIONS: Existing diagnostic criteria perform modestly in distinguishing IBS from organic disease. There appears to be little difference in terms of accuracy. More accurate ways of diagnosing IBS, avoiding the need for investigation, are required

Longitudinal estimation of Plasmodium falciparum prevalence in relation to malaria prevention measures in six sub-Saharan African countries.

BACKGROUND: Plasmodium falciparum prevalence (PfPR) is a widely used metric for assessing malaria transmission intensity. This study was carried out concurrently with the RTS,S/AS01 candidate malaria vaccine Phase III trial and estimated PfPR over ≤ 4 standardized cross-sectional surveys. METHODS: This epidemiology study (NCT01190202) was conducted in 8 sites from 6 countries (Burkina Faso, Gabon, Ghana, Kenya, Malawi, and Tanzania), between March 2011 and December 2013. Participants were enrolled in a 2:1:1 ratio according to age category: 6 months-4 years, 5-19 years, and ≥ 20 years, respectively, per year and per centre. All sites carried out surveys 1-3 while survey 4 was conducted only in 3 sites. Surveys were usually performed during the peak malaria parasite transmission season, in one home visit, when medical history and malaria risk factors/prevention measures were collected, and a blood sample taken for rapid diagnostic test, microscopy, and haemoglobin measurement. PfPR was estimated by site and age category. RESULTS: Overall, 6401 (survey 1), 6411 (survey 2), 6400 (survey 3), and 2399 (survey 4) individuals were included in the analyses. In the 6 months-4 years age group, the lowest prevalence (assessed using microscopy) was observed in 2 Tanzanian centres (4.6% for Korogwe and 9.95% for Bagamoyo) and Lambaréné, Gabon (6.0%), while the highest PfPR was recorded for Nanoro, Burkina Faso (52.5%). PfPR significantly decreased over the 3 years in Agogo (Ghana), Kombewa (Kenya), Lilongwe (Malawi), and Bagamoyo (Tanzania), and a trend for increased PfPR was observed over the 4 surveys for Kintampo, Ghana. Over the 4 surveys, for all sites, PfPR was predominantly higher in the 5-19 years group than in the other age categories. Occurrence of fever and anaemia was associated with high P. falciparum parasitaemia. Univariate analyses showed a significant association of anti-malarial treatment in 4 surveys (odds ratios [ORs]: 0.52, 0.52, 0.68, 0.41) and bed net use in 2 surveys (ORs: 0.63, 0.68, 1.03, 1.78) with lower risk of malaria infection. CONCLUSION: Local PfPR differed substantially between sites and age groups. In children 6 months-4 years old, a significant decrease in prevalence over the 3 years was observed in 4 out of the 8 study sites. Trial registration Clinical Trials.gov identifier: NCT01190202:NCT. GSK Study ID numbers: 114001