Assessing the reliability and degradation of 10-35 years field-aged PV modules.
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ABSTRACT:
SUBMITTER: Noman M
PROVIDER: S-EPMC8769327 | biostudies-literature |
REPOSITORIES: biostudies-literature
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Project description:Sun light as a renewable energy resource is getting popular day by day. Power production from a solar power plant is extensively dependent on the weather condition, daylight duration, available sunlight, air quality etc. Thus installation of large scale solar power plant requires long term feasibility study, previous five years weather data, lifetime of the solar panel, projected maintenance requirement and man power. In this survey we have visited several sites of roof top solar power plants in the Dhaka city which are aged at least five years. Firstly, we have conducted visual study of the solar panels on the roof top for visible degradation due to environment and ageing. Then we have measured Current-Voltage characteristics under sun light using portable PV-200 Seaward I-V Tracer. The Current-Voltage data were analyzed using 'Seaward Solar Chart' data analysis tool. The tool was used to plot Current-Voltage and Power-Voltage curves. From the data we have estimated the Standard Test Condition (STC) power, Fill Factor (F.F) and Efficiency of selected photovoltaic modules. To get a clear view over the experience of installed rooftop solar photovoltaic modules in Dhaka city, the data will be useful. The data will help us to project the challenges and provide a guide line to maintain an economically viable solar photovoltaic installation.
| S-EPMC7267713 | biostudies-literature
Project description:ObjectivesThe aims of this study were to develop a German version of the Child Perceptions Questionnaire for children aged 8 to 10 years (CPQ-G8-10), a measure of oral health-related quality of life, and to assess the instrument's reliability and validity.MethodsThe original English version of the CPQ8-10 questionnaire was translated into German (CPQ-G8-10) by a forward-backward translation method. A total of 409 8- to 10-year-old children who were recruited at the Department of Paediatric Dentistry in Vienna, Austria, participated in this study. The children self-completed the CPQ-G8-10 and were clinically examined for the presence of dental caries and plaque accumulation. Reliability of CPQ-G8-10 was investigated in a subsample of 58 children after 3 weeks.ResultsQuestionnaire summary score test-retest reliability was 0.85 (intraclass correlation coefficient, 95% confidence interval (CI) ranging from 0.75 to 0.91) and internal consistency was 0.88 (Cronbach's alpha, lower limit of the 95% CI: 0.87). Validity of the CPQ-G8-10 questionnaire was supported by correlation coefficients with global ratings of oral health of - 0.40 (95% CI - 0.49 to - 0.31) and overall well-being of - 0.26 (95% CI - 0.33 to - 0.13) which met the expectations. Mean CPQ-G8-10 scores were statistically significantly higher in children with caries (dmft+DMFT > 0) compared with caries-free children (p = 0.02).ConclusionsThe German version of the CPQ8-10 was found to be reliable and valid in children aged 8 to 10 years.Clinical relevanceThese findings enable assessments of oral health-related quality of life in German speaking 8- to 10-year-old children.
| S-EPMC7878203 | biostudies-literature
Project description:Polyphenols have been suggested as protective factors for a range of chronic diseases. However, studying the impact of individual polyphenols on health is hindered by the intrinsic inter-correlations among polyphenols. Alternatively, studying foods rich in specific polyphenols fails to grasp the ubiquity of these components. Studying overall dietary patterns would allow for a more comprehensive description of polyphenol intakes in the population. Our objective was to identify clusters of dietary polyphenol intakes in a French middle-aged population (35-64 years old). Participants from the primary prevention trial SUpplementation en VItamines et Minéraux AntioXydants (SU.VI.MAX) study were included in the present cross-sectional study (n 6092; 57·8 % females; mean age 48·7 (sd 6·4) years). The fifty most consumed individual dietary polyphenols were divided into energy-adjusted tertiles and introduced in a multiple correspondence analysis (MCA), leading to comprehensive factors of dietary polyphenol intakes. The identified factors discriminating polyphenol intakes were used in a hierarchical clustering procedure. Four clusters were identified, corresponding broadly to clustered preferences for their respective food sources. Cluster 1 was characterised by high intakes of tea polyphenols. Cluster 2 was characterised by high intakes of wine polyphenols. Cluster 3 was characterised by high intakes of flavanones and flavones, corresponding to high consumption of fruit and vegetables, and more broadly to a healthier diet. Cluster 4 was characterised by high intakes of hydroxycinnamic acids, but was also associated with alcohol consumption and smoking. Profiles of polyphenol intakes allowed for the identification of meaningful combinations of polyphenol intakes in the diet.
| S-EPMC4976116 | biostudies-literature
Project description:BackgroundThis single-center retrospective cohort study aimed to evaluate and compare implant survival and patient-reported outcome measures in 2 distinct age groups separated by 20 years who underwent hip resurfacing arthroplasty (HRA).MethodsBetween 2005 and 2014, 2042 HRAs were performed by a single-surgeon, and 75 and 377 hips from patients aged ≤35 years and ≥55 years, respectively, were included in this study. Implant survival was determined for all available hips. Clinical features and patient-reported outcome measures were collected.ResultsSeven hips were revised, 4 for aseptic loosening of one or both components, one for infection, one for accelerated wear and metallosis, and one for femoral neck fracture. There was no difference in all-cause 10-year revision, with 97.1% (95% confidence interval 80.9 to 99.6) and 99.6% (95% confidence interval: 97 to 99.9) survivorship in younger and older patients, respectively (P = .246). Preoperatively, younger patients were less active than older patients on the Lower Extremity Activity Scale (LEAS) or University of California, Los Angeles, activity scale, but at follow-up, younger patients outpaced older ones.ConclusionOriginal to our study was the isolation and comparison of 2 distinct age groups. With excellent results in disparate age groups, HRA can be applied to a broad patient demographic and is suitable for those patients who want to achieve a high activity level as defined by Lower Extremity Activity Scale or University of California, Los Angeles, scores.
| S-EPMC7818604 | biostudies-literature
Project description:BACKGROUND:Poor cognitive performance is associated with high vascular risk. However, this association is only investigated in elderly. As neuropathological changes precede clinical symptoms of cognitive impairment by several decades, it is likely that cognitive performance is already associated with vascular risk at middle-age. OBJECTIVES:To investigate the association of cognitive performance with treatable vascular risk in middle-aged and old persons. DESIGN:Longitudinal study with three measurements during follow-up period of 5.5 years. SETTING:City of Groningen, the Netherlands. PARTICIPANTS:Cohort of 3,572 participants (age range, 35-82 years; mean age, 54 years; men, 52%). EXPOSURE:Treatable vascular risk as defined by treatable components of the Framingham Risk Score for Cardiovascular Disease at the first measurement (diabetes mellitus, smoking, hypercholesterolemia and hypertension). MEASUREMENTS:Change in cognitive performance during follow-up. Cognitive performance was measured with Ruff Figural Fluency Test (RFFT) and Visual Association Test (VAT), and calculated as the average of the standardized RFFT and VAT score per participant. RESULTS:The mean (SD) cognitive performance changed from 0.00 (0.79) at the first measurement to 0.15 (0.83) at second measurement and to 0.39 (0.82) at the third measurement (Ptrend<0.001). This change was negatively associated with treatable vascular risk: the change in cognitive performance between two measurements decreased with 0.004 per one-point increment of treatable vascular risk (95%CI, -0.008 to 0.000; P=0.05) and with 0.006 per one-year increment of age (95%CI, -0.008 to -0.004; P<0.001). CONCLUSIONS:Change in cognitive performance was associated with treatable vascular risk in persons aged 35 years or older.
| S-EPMC6515561 | biostudies-literature
Project description:INTRODUCTION:Suicide among military personnel and young Veterans remains a health concern. This study examined stateside distribution of suicides by U.S. county to help focus prevention efforts. METHODS:Using 2005-2012 National Violent Death Reporting System data from 16 states (963 counties, or county-equivalent entities), this study mapped the county-level distribution of suicides among current military and Veteran decedents aged 18-35 years. This study also compared incident circumstances of death between decedents in high-density counties (i.e., counties with the highest proportion of deaths) versus those in medium/low-density counties to better understand the precipitators of suicide in counties most affected. Last, this study identified potential military and Veteran Health Administration intervention sites. All analyses were conducted in 2015. RESULTS:Within the National Violent Death Reporting System participating states, an estimated 262 (33%) current military suicides occurred in just ten (1.0%) counties, and 391 (33%) Veteran suicides occurred in 33 (3.4%) counties. Mental health and intimate partner problems were common precipitating circumstances, and some circumstances differed between cases in high- versus those in medium/low-density counties. Multiple potential intervention sites were identified in high-density counties. CONCLUSIONS:These findings suggest that military and Veteran suicides are concentrated in a small number of counties. Increased efforts at these locales might be beneficial.
| S-EPMC6046215 | biostudies-literature
Project description:Identification for microRNA signatures to predict breast cancer recurrence in young women were performed through expression profiling of a total 2565 miRNAs in 45 samples diagnosed as invasive ducatal carcinoma of no special type (NST) cases which had been consecutively operated on within a defined short period of time.
2017-11-22 | GSE97811 | GEO
Project description:Pregnancy is affected by maternal age from conception till delivery. Various studies have been conducted globally to study this effect; few in developing countries. Maternal age is increasing in developing countries as well, so we have conducted this study.This was a prospective observational study consisting of 1,263 women booked at Jehangir hospital during a period of 2 years, fulfilling inclusion criteria and consenting for the study. They were divided into two groups; women aged 35 years and above and women less than 35 years of age. Pregnancy outcomes were studied in terms of antepartum, intrapartum and postpartum complications. Neonatal outcomes were studied in terms of birth weight and NICU admissions. Data was analyzed statistically using statistical package for social sciences version 17, by applying Chi square test and Fisher exact test. A p value below 0.05 was considered significant.Women aged 35 years and above constituted 9.63 % of the total study population. Most were multigravidae. Rate of assisted conception was significantly higher among women aged 35 years and above; early pregnancy loss was also high in this group. Pre-eclampsia and abruption were significantly higher among them. Neonatal outcomes were comparable.Women with advanced maternal age are at higher risk of complications from conception till delivery and should be provided close supervision for better pregnancy outcome.
| S-EPMC4395583 | biostudies-other
Project description:IntroductionThe prevalence of obesity-related disorders has been steadily increasing over the past couple of decades. Diseases that were once only detected in adults are now prevalent in children, such as hyperlipidemia. The adipose tissue-derived hormonal factor C1q TNF Related Protein 3 (CTRP3) has been linked to triglyceride regulation especially in animal models. However, the relationship between circulating CTRP3 levels and obesity-related disorders in human subjects is controversial. CTRP3 can circulate in different oligomeric complexes: trimeric (<100 kDa), middle molecular weight (100-300 kDa), and high molecular weight (HMW) oligomeric complexes (>300 kDa). Previous work has identified that it is not the total amount of CTRP3 present in the serum, but the specific circulating oligomeric complexes that appear to be indicative of the relationship between CTRP3 and serum lipids levels. However, this work has not been examined in children. Therefore, the purpose of this study was to compare the levels of different oligomeric complexes of CTRP3 and circulating lipid levels among young children (aged 7-10 years).MethodsMorphometric data and serum samples were collected and analyzed from a cross-sectional population of 62 children of self-identified Hispanic origin from a community health center, between 2015 and 2016. Serum analysis included adiponectin, insulin, leptin, ghrelin, glucagon, C-reactive peptide, triglyceride, cholesterol, IL-6, TNF, and CTRP3. Correlation analyses were conducted to explore the relationships between CTRP3 and other biomarkers.ResultsTotal CTRP3 concentrations were significantly positively correlated with total cholesterol and HDL cholesterol. Whereas, HMW CTRP3 was not significantly associated with any variable measured. Conversely, the middle molecular weight (MMW) CTRP3 was negatively correlated with triglycerides levels, and very low-density lipoprotein (VLDL), insulin, and body mass index (BMI). The negative correlations between MMW CTRP3 and triglycerides and VLDLs were particularly strong (r2 = -0.826 and -0.827, respectively).ConclusionOverall, these data indicate that the circulating oligomeric state of CTRP3 and not just total CTRP3 level is important for understanding the association between CTRP3 and metabolic diseases. Further, this work indicates that MMW CTRP3 plays an important role in triglyceride and VLDL regulation which requires further study.
| S-EPMC7714231 | biostudies-literature
Project description:BACKGROUND:Development and evaluation of an accelerometers technique for collecting data for asses balance had reported difficulty due to equilibrium reactions and continuous bursts. The aim of this study is to determine the reliability and internal consistency of accelerometric measurements, related to static equilibrium and gait in children aged 6 to 12?years. METHODS:This descriptive and cross-sectional study involved 70 healthy children (50% girls) with a mean age of 9?years old. At the height of the 4th lumbar vertebra and directly on the skin, an accelerometer was placed on each participant. All of them had to complete four trials three times: balancing on one leg with eyes closed and eyes open, dynamic balancing on one leg on a foam mat, and normal gait. RESULTS:Results show that tests performed in older children had higher internal consistency than those performed in younger children (vertical axis r?=?0.82, sagittal axis r?=?0.77, and perpendicular axis r?=?0.74). Tests performed in children aged 8?years or older presented a strong correlation between trials (r?>?0.71). The three static equilibrium tests obtained reliability values between 0.76 y 0.84. On the contrary, gait test obtained inferior and poorer results (0.6?<?r?<?0.71). CONCLUSIONS:This method of assessment obtained positive results as an instrument for the quantitative assessment of balance in school-aged children. Values obtained for the three one-leg balance and static tests,were more strongly correlated than the normal gait test for all axes.
| S-EPMC7155341 | biostudies-literature