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result(s) for
"Azhar, Mohammed"
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Ensemble Learning Approach for Probabilistic Forecasting of Solar Power Generation
by
Ahmed Mohammed, Azhar
,
Aung, Zeyar
in
ensemble models
,
Machine learning
,
probabilistic forecasting
2016
Probabilistic forecasting accounts for the uncertainty in prediction that arises from inaccurate input data due to measurement errors, as well as the inherent inaccuracy of a prediction model. Because of the variable nature of renewable power generation depending on weather conditions, probabilistic forecasting is well suited to it. For a grid-tied solar farm, it is increasingly important to forecast the solar power generation several hours ahead. In this study, we propose three different methods for ensemble probabilistic forecasting, derived from seven individual machine learning models, to generate 24-h ahead solar power forecasts. We have shown that while all of the individual machine learning models are more accurate than the traditional benchmark models, like autoregressive integrated moving average (ARIMA), the ensemble models offer even more accurate results than any individual machine learning model alone does. Furthermore, it is observed that running separate models on the data belonging to the same hour of the day vastly improves the accuracy of the results. Getting more accurate forecasts will help the stakeholders come up with better decisions in resource planning and control when large-scale solar farms are integrated into the power grid.
Journal Article
Continuous glucose monitoring-based evaluation of percentage coefficient of variation (%CV) as a metric of intraday glycemic variability in South India
2026
Hemoglobin A1c (HbA1c) is globally recognized as a reliable biomarker for evaluating glycemic control, but it fails to reflect the short-term glycemic fluctuations. Glycemic variability, particularly intraday fluctuations, provides additional information regarding daily glucose excursions and their associated risks. In this cross-sectional study, thirty-two South Indian rural patients with Type 2 Diabetes Mellitus undergoing continuous glucose monitoring were investigated. Baseline demographic, clinical and biochemical characteristics were recorded. Intraday glycemic variability was assessed as Percentage Coefficient of Variation (%CV). Spearman’s rank correlation analysis was performed to assess the relationship between %CV and other CGM metrics including Time in Range (TIR), Time below Range (TBR), Time above Range (TAR) and average glucose. Mixed-effects linear regression models with random intercepts for participants were constructed to examine the adjusted associations. The mean %CV was 22.03 ± 5.08%. In correlation analysis, %CV demonstrated a positive correlation with TBR (ρ = 0.346), although this did not reach statistical significance (
p
= 0.053). No significant correlations were observed between %CV and average glucose, TIR, TAR or episode-based glycemic measures. In mixed-effects linear regression analysis, higher intraday %CV was significantly associated with same-day TBR in both unadjusted (β = 0.207; 95% CI 0.139–0.274;
p
< 0.001) and adjusted models. TAR was not significant in unadjusted models; however, adjusted models including age with insulin and/or sulfonylurea use and age with average glucose showed statistically significant associations. No significant associations were observed between %CV and TIR or average glucose. Within this study population, higher intraday glycemic variability was associated with greater same-day hypoglycemic exposure as reflected by TBR. Larger longitudinal studies are required to determine the temporal and clinical implications of elevated %CV.
Journal Article
Implementation of external magnetic field to improve strength of St37 steel resistance spot weld
by
Elyasi, Majid
,
Mohammed Nafea, Azhar A.
,
Aghajani Derazkola, Hamed
in
CAE) and Design
,
Computer-Aided Engineering (CAD
,
Engineering
2024
The magnetic assist technique involves the interaction between an external magnetic field and electrical current which produces Lorentz force that influences the flow pattern of molten metal and ultimately impacts the appearance and microstructure of the weld. Many parameters may influence on this process such as welding current, time, and force as well as the working magnet distance (MD). In this study, the effects of the distance between the permanent magnet’s MD on the heat-affected zone (HAZ) and weld nugget zone (NZ) were examined through mechanical and macro- and microstructural analyses. The results demonstrated that MD has a strong influence on the magnetic flux density which determines the joint appearance, quality, and microstructure of St37 steel. Results showed that with increasing MD, HAZ increased from 8 to 22 mm
2
while NZ decreased from 26 to 19 mm
2
, and also, the grain size increased with increasing MD and reaching 48 µm at MD was set to 9 cm. Moreover, hardness decreased at both areas through increasing MD from (120–110) HV at HAZ and from (170–150) HV at NZ. Under the action of (electromagnetic filed) EMF, weld tensile shear strength and the cross tensile strength give the highest values equal to 172 MPa and 155 MPa, respectively, when MD is set to 4.5 cm. Besides, soundness joint was obtained at MD = 4.5 cm which confirms that this is the best distance between magnets.
Journal Article
Equitable cleanup of Superfund sites leaving no U.S. community behind
by
Azhar, Mohammed
,
Madani, Kaveh
,
Vahedifard, Farshid
in
704/844/2787
,
706/689/680
,
At risk populations
2025
Superfund sites are recognized as the most contaminated locations across the U.S. Here we introduce two metrics: (i) the disparity percentage, which quantifies the overrepresentation of vulnerable populations in proximity to Superfund sites, and (ii) the Superfund exposure score, which evaluates the population proportion in a geographical region affected by such proximity. We employ the metrics to develop an Action Priority Matrix (APM) categorizing states and regions into four tiers of cleanup priorities, informed by a spatial analysis of 13,453 Superfund sites across the U.S. About 80% of the U.S. population live within 10 km of at least one Superfund site, with nearly 60% of them residing in areas lacking any cleanup efforts. Asian, Black, and disadvantaged populations are found to be disproportionately overrepresented in Superfund host block groups. Seven states are identified for urgent cleanups using the proposed APM, providing a systematic approach to equitable resource allocation for cleanups.
This study reveals disparities in Superfund site exposure among vulnerable US communities and introduces metrics and an action priority matrix to guide equitable and targeted cleanup efforts.
Journal Article
Essential Oil Nanoemulsions and their Antimicrobial and Food Applications
by
KHAN, HUMA
,
KAUSHIK, RAVINDER
,
KHAN, MOHAMMED AZHAR
in
Antimicrobial agents
,
Essential oils
,
Food
2018
The consumer awareness for secure insignificantly handled food has constrained the food dealers either to decrease the measure of chemically synthetic antimicrobial substances or to replace them with natural ones. Essential oils (EO) extracted from edible, therapeutic and herbal plants have been well recognized as natural antimicrobial additives. As characteristic then viable antimicrobials, EO have been progressively observed towards control of foodborne microbes and progression of nourishment wellbeing. It is ordinarily hard to achieve high antimicrobial vulnerability when mixing with EO in nourishment based items because of low dissolvability of water and interactive binding. Subsequently, the delivery system of nanoemulsion-based EO is emerging as aviable solution to control the growth of foodborne pathogens. Lipophilic compounds are distributed uniformly in the aqueous phase with the help of nanoemulsion technique. Therefore, the nanoemulsion formulation is generally comprised of mainly three constituents i.e. oil phase, aqueous and a surfactant. Nanoemulsions droplet average diameters should below 100 nm. According to previous studies, the clove, cinnamon and thyme oil nanoemulsions which were formulated with non ionic surfactants (Spans and Tweens) were having droplet size less than 100nm. The current review emphases on essential oil based nanoemulsions which are prepared with different ingredients which hence, enhance the antimicrobial action in food items.
Journal Article
Comprehensive portfolio of adaptation measures to safeguard against evolving flood risks in a changing climate
2025
Flooding exacerbated by climate change presents growing risks to communities worldwide. Despite extensive research on flood risk, there is a lack of critical analysis of flood adaptation measures spanning traditional and emerging methods. Here, we compile a comprehensive portfolio of 39 adaptation measures classified into four groups: infrastructural/technological, institutional, behavioral/cultural, and nature-based measures. Each measure is evaluated for its advantages, disadvantages, co-benefits, and tradeoffs. Our analysis identifies four broad eras in the evolution of flood adaptation measures. While early efforts primarily focused on structural modifications, more recent projects shifted toward soft adaptation measures, with a growing interest in employing community-centered and nature-based solutions. We lay out key decision-making attributes to identify successful adaptation strategies that are socially just, practically feasible, and technically sound. Finally, we highlight gaps and provide recommendations for future research, with an emphasis on a transdisciplinary approach toward developing and implementing climate-resilient and equitable flood adaptation strategies.
The focus of flood adaptation measures has shifted over recent decades from structural modifications towards community-centred and nature-based solutions, according to a global synthesis and classification of adaptation measures.
Journal Article
Overrepresentation of Historically Underserved and Socially Vulnerable Communities Behind Levees in the United States
by
Dustin C. Brown
,
Mohammed Azhar
,
Farshid Vahedifard
in
Access to information
,
Anthropogenic climate changes
,
Anthropogenic factors
2023
Infrastructure equity is an immediate concern with levees, constituting the backbone of the U.S. protection against flooding. Flooding patterns are exacerbated by anthropogenic climate change in several regions, posing a significant risk to the economy, safety, and well‐being of the nation. The evolving risk of flooding is shown to disproportionately affect historically underserved and socially vulnerable communities (HUSVCs). Here we compare the sociodemographic and socioeconomic composition of leveed and non‐leveed U.S. communities and show a substantial overrepresentation of HUSVCs in leveed areas at the state, regional, and national levels. Further, we analyze the proportion of communities designated as “disadvantaged” in leveed versus non‐leveed areas, revealing a substantially larger population of disadvantaged communities residing behind levees. Our analyses show that nationally, Hispanic are the most overrepresented population in leveed areas yielding a disparity percentage of 39.9%, followed by Native American (18.7%), Asian (17.7%), and Black (16.1%) communities. Communities characterized by low education, poverty, and disability exhibit a disproportionately higher presentation of 27.8%, 20.4%, and 5.4% in leveed areas across the U.S. In 43 states, disadvantaged communities are overrepresented behind levees, with a national disparity percentage of 40.6%. At the regional level, the highest disparity was observed in the Northeast (57.3%), followed by the West (51.3%), Southeast (38%), Midwest (29.2%), and Southwest (25%). The findings can enable decision‐ and policy‐makers to identify hotspots within HUSVCs that need to be prioritized for enhancing the integrity and climate adaptation of their levee systems. Plain Language Summary Levees constitute the backbone of the nation's protection system against flooding, which is shown to disproportionately impact historically underserved and socially vulnerable communities (HUSVCs). Here we identify disparities in levee‐protected U.S. communities by comparing several sociodemographic and socioeconomic attributes in non‐leveed areas with tracts behind levees listed in the National Levee Database. Further, we analyze the proportion of leveed versus non‐leveed communities designated as “disadvantaged.” We found a substantial overrepresentation of HUSVCs in leveed areas at the state, regional, and national levels. Nationally, the major disparities are found to be Hispanic (39.9%), low education (27.8%), poverty (20.4%), native American (18.7%), Asian (17.7%), and Black (16.1%). Regionally, In the Midwest and Southeast, 60.6% and 40.2%, respectively, more Black populations live behind levees. In the West, the largest disparities are education (40.5%) and Hispanic or Latino (38.6%). In 43 states, disadvantaged communities are overrepresented behind levees, with a national disparity percentage of 40.6%. The highest regional disparity was observed in the Northeast (57.3%), followed by the West (51.3%), Southeast (38%), Midwest (29.2%), and Southwest (25%). The findings can enable decision‐ and policy‐makers to identify hotspots within HUSVCs that need to be prioritized for enhancing the integrity of their levee systems. Key Points Infrastructure equity is an immediate concern with levees We found substantial disparities in race/ethnicity, education, poverty, and disability of leveed‐ versus non‐leveed U.S. communities Historically underserved and socially vulnerable communities are substantially overrepresented in leveed areas compared to non‐leveed areas
Journal Article
Formulation and Characterization of Gum Arabic Stabilized Red Rice Extract Nanoemulsion
by
Klepacka, Joanna
,
Dhull, Sanju Bala
,
Bains, Aarti
in
Additives
,
Antiinfectives and antibacterials
,
Antimicrobial agents
2022
Interest in the utilization of plant-based bioactive compounds in foods has increased due to their biochemical activities and as alternatives in the reduction of high concentrations of chemical utilization. However, some of these additives are hydrophobic, thus being harder to disperse into the hydrophilic food matrix. Therefore, an oil-in-water nanoemulsion (RRE1-RRE10) was formulated with different concentrations of red rice extract (1–10% w/v). Nanoemulsion showed droplet sizes within the range of 157.33–229.71 nm and the best formulation (RRE5) was selected based on the creaming index which was stable to flocculation over a range of temperatures (30–90 °C), pH (2–9), and salt concentration (100–600 mM). It showed significantly improved antioxidant and anti-inflammatory activity as compared to its other counterparts. Potential antimicrobial activity against Staphylococcus aureus was attributed to RRE5 nanoemulsion as compared to Escherichia coli. Therefore, due to the potential bioactivity of RRE5 nanoemulsion, it can be scaled up at the industrial level.
Journal Article
Presentation and Management of Addison's Disease in a 10‐Year‐Old Boy: A Case Report
by
Tejashree, Pasumarthi
,
Sivannan, Srinivasan
,
Hussaini, Syed Mohammed
in
Addison's disease
,
aldosterone
,
Antibiotics
2026
Addison's disease, or primary adrenal insufficiency, is a rare endocrine disorder characterized by impaired adrenal hormone production. We report a case of a 10‐year‐old boy with congenital adrenal hyperplasia and secondary Addison's disease on long‐term corticosteroid therapy who presented with recurrent non‐bilious vomiting, low‐grade fever, headache, and epigastric pain. Physical examination revealed short stature (below the third percentile) and overweight status (90th percentile), likely related to prolonged steroid use. He was managed with intravenous fluids, adjustment of antibiotics, and optimized steroid therapy, leading to significant clinical improvement. This case highlights the complexity of managing pediatric adrenal insufficiency, particularly in patients receiving chronic corticosteroids. Lifelong individualized hormone replacement, careful dose adjustment, and regular monitoring are essential to prevent adrenal crises and long‐term metabolic complications. A multidisciplinary approach involving endocrinologists, pediatricians, and supportive care teams is crucial for optimal outcomes in children with Addison's disease.
Journal Article
Clinical assessment of bone quality at implant site using CBCT and hounsfield unit
2023
Objectives: The current research was done to assess the bone quality at implant site using CBCT. Materials and Methods: The present study was conducted on 50 partially edentulous patients of both genders. All subjects had their chests scanned using a Kodac machine set to 120 kVp, 12 mA, and a 17-second exposure time. Using Hounsfield units, bone quality was classified as D1, D2, D3, D4, and D5 (HU). Result: Out of 50 patients, 27 were males and 23 were females. The average HU was 786.1 at the anterior maxilla, 1174.3 at the anterior mandible, 332.1 at the posterior maxilla, and 742.4 at the posterior mandible. The variation was considerable (P-0.01). Conclusion: The anterior mandible, anterior maxilla, posterior mandible, and posterior maxilla were found to have the highest densities. Based on Hounsfield units, CBCT is helpful in determining the bone density at the implant site.
Journal Article