Iridium-palladium binary alloy as a counter electrode in dye-sensitized solar cells.

This study is concerned with the iridium-palladium (Ir-Pd) binary alloy as a counter electrode (CE) for DSSC. The CE was prepared using the liquid phase deposition (LPD) technique. The influence of the concentration of hydrogen hexachloroiridate(IV) hydrate (H2Cl6Ir·H2O) on the properties and the performance of the device was investigated. The source of iridium was H2Cl6Ir·H2O. XRD analysis confirmed that the dominant phase of Ir-Pd existed in the sample. The grain size of Ir-Pd increased with the increase in the concentration of H2Cl6Ir·H2O until an optimum concentration of 0.7 mM was reached. The % wt of Ir was found to increase with the concentration of H2Cl6Ir·H2O. The device utilizing Ir-Pd CE with 0.7 mM H2Cl6Ir·H2O demonstrated the highest power conversion efficiency (PCE) of 5.84%, beating that of the device with Pt CE having a PCE of 5.04%. This is because the device possesses the lowest charge transfer resistance (Rct), highest recombination resistance (Rcr), and longest carrier lifetime (τ), and the device possesses the highest reduction current (Jpc) and incident-photon conversion efficiency (IPCE). The PCE was significantly affected by Ir content in the binary alloy of Ir-Pd. According to the PCE result, Ir-Pd CE was found as a suitable substitution for Pt as CE for the device.

Predictors of pediatric HIV disclosure among caregivers of HIV positive children attending special treatment clinic in dalhatu araf specialist hospital, Lafia, Nigeria.

BACKGROUND: HIV-infected children now live longer due to the availability of HIV counseling, testing, and treatment with highly active antiretroviral treatment (HAART). Efforts to help these children to know about the HIV infection and their status are important steps toward long-term disease management. This study was conducted to determine the factors associated with pediatric HIV disclosure among caregivers of children attending Special Treatment Clinic at Dalhatu Araf Specialist Hospital, Lafia. METHODS: This was a descriptive cross-sectional study conducted among 160 caregivers of children attending the Special Treatment Clinic (STC) at DASH, Lafia, selected by systematic random sampling technique. Interviewer administered structured questionnaire was used to collect data, while bivariate and multivariate analyses were done with the Epi Info version 7. RESULTS: Pediatric HIV disclosure rate in this study was 33.8%. The mean age at pediatric HIV disclosure was 9.85 ± 1.86 years. The independent predictors for pediatric HIV disclosure following logistic regression were child's age, 10-14 years (AOR = 4.46; 95%CI 1.47-13.61), child knowledge of caregivers' HIV status (AOR = 51.18; 95%CI 13.40-195.66), and caregivers' age ≥40 years (AOR = 3.58; 95%CI 1.25-11.74). CONCLUSIONS: The pediatric HIV disclosure was low in this study due to the caregivers' and their wards' factors. Health care workers need to intensify health education on the benefit of pediatric HIV disclosure at the STC clinic.

Effect of health education on long lasting insecticidal nets utilization among mothers of under five children in Yamaltu Deba Lga, Gombe State, Nigeria

Background: Malaria remains a major global public health challenge. It is the leading cause of death among children below the age of five years and constitutes 10% of the continent's disease burden. The objective of this study was to determine effect of health education on utilization of long lasting insecticidal nets (LLINs) among mothers of under five children in Yamaltu Deba LGA of Gombe state: Objective: This study was aimed at determining the effect of health education on LLINs utilization among mothers of under five children in Yamaltu Deba LGA of Gombe State. Method: The study was a community-based quasi-experimental intervention where 240 mothers of under five children were selected from two communities using a multi stage sampling technique. Health education was given in the study community and withheld in the control community. Data was collected from both communities before and after the intervention using an interviewer administered structured questionnaire. Data was analyzed using EPI-INFO 3.7.1 and Micro soft Excel software. Result obtained was presented using proportion, Chi-square test was used to assess the relationship between categorical variables and decision taken at p<0.05. Results: The mean ages of respondents in study and control communities were 28.9±6.2 and 27.9±6.7 years respectively. At pre-intervention, LLIN ownership was found to be 86.6% and 76.3% while its utilization was 45.4% and 38.1% in both communities. After health education intervention, (LLINs) improved significantly in study community from 42.9% to 89.9% compared with control community which increased from 33.9% to 60.9% and the difference was statistically significant(P=0.0001). Conclusion: This study concludes that health education significantly improved utilization. We recommended continuous health education on LLINs utilization in communities especially among mothers of under five children