Ahmad Umar
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View article: SUN-108 Occult Bilateral Leydig Cell Tumors in a Postmenopausal Woman with Hyperandrogenism: A Rare Diagnostic Challenge
SUN-108 Occult Bilateral Leydig Cell Tumors in a Postmenopausal Woman with Hyperandrogenism: A Rare Diagnostic Challenge Open
Disclosure: Y. Prystupa: None. U. Ahmad: None. IntroductionLeydig cell tumors (LCTs) are rare androgen-secreting ovarian neoplasms, accounting for only 0.5% of all ovarian tumors. These tumors are typically benign, unilateral, and often de…
View article: Sensory Evaluation and Proximate Quality of Smoked Bonytongue Fish (Heterotis niloticus Cuvier, 1829) Treated with Different Seasonings from North Eastern Nigeria
Sensory Evaluation and Proximate Quality of Smoked Bonytongue Fish (Heterotis niloticus Cuvier, 1829) Treated with Different Seasonings from North Eastern Nigeria Open
This study investigated the effects of different seasonings salt (5%), garlic (3%), and ginger (3%) on the sensory and proximate quality of smoked Heterotis niloticus (bonytongue fish) in Northeastern Nigeria. The sensory results showed th…
View article: Smartphone-integrated paper sensor strips for rapid and on-site detection of heavy metal ions in environmental water samples
Smartphone-integrated paper sensor strips for rapid and on-site detection of heavy metal ions in environmental water samples Open
View article: Mitigation of sulfide adsorption in natural gas by silanized stainless steel: insights from density functional theory
Mitigation of sulfide adsorption in natural gas by silanized stainless steel: insights from density functional theory Open
View article: Sustainable synthesis and multifunctional applications of biowaste-derived carbon nanomaterials and metal oxide composites: A review
Sustainable synthesis and multifunctional applications of biowaste-derived carbon nanomaterials and metal oxide composites: A review Open
The conversion of biowaste into carbon nanomaterials (CNMs) and their metal oxide composites has emerged as a sustainable strategy to address environmental challenges while advancing nanotechnology. This comprehensive review critically exa…
View article: Frame and catch assessment of fishes in GUBI dam, Bauchi State, Northeastern Nigeria
Frame and catch assessment of fishes in GUBI dam, Bauchi State, Northeastern Nigeria Open
View article: Investigation on the influence of date palm fiber on the strength and durability of concrete with rice husk ash as partial replacement of cement
Investigation on the influence of date palm fiber on the strength and durability of concrete with rice husk ash as partial replacement of cement Open
The utilization of waste materials in concrete production has gained significant attention in recent years as a sustainable approach to mitigate environmental concerns and enhance the performance of construction materials. This research pr…
View article: Thoracoscopic surgical ablation for atrial fibrillation patients with functional regurgitation: the treatment strategy prioritizing atrial fibrillation
Thoracoscopic surgical ablation for atrial fibrillation patients with functional regurgitation: the treatment strategy prioritizing atrial fibrillation Open
Background: Atrial fibrillation (AF) and functional regurgitation (FR) have complex interactions. This study investigated the interactions between thoracoscopic surgical ablation (TSA) and FR in patients with AF, to explore whether the str…
View article: Hemicelluloses: A Review on Extraction and Modification for Various Applications
Hemicelluloses: A Review on Extraction and Modification for Various Applications Open
Hemicelluloses, a key component of lignocellulosic biomass, are versatile noncellulosic polysaccharides that play a crucial role in various industrial applications. Despite their abundance, hemicelluloses have often been overshadowed by ce…
View article: Pengaruh Kreativitas dan Pengetahuan Kewirausahaan Terhadap Pembentukan Jiwa Wirausaha Muda pada Mahasiswa FE UNIMED
Pengaruh Kreativitas dan Pengetahuan Kewirausahaan Terhadap Pembentukan Jiwa Wirausaha Muda pada Mahasiswa FE UNIMED Open
This study aims to analyze the influence of creativity and entrepreneurial knowledge on the development of entrepreneurial spirit among young people in the digital era, specifically students of the Faculty of Economics, Universitas Negeri …
View article: Novel Biosynthesis of Spherical Tungsten Trioxide Nanoparticles for Sustainable Photocatalytic Application
Novel Biosynthesis of Spherical Tungsten Trioxide Nanoparticles for Sustainable Photocatalytic Application Open
We developed a novel method for synthesizing tungsten trioxide nanoparticles, utilizing orange juice as a sustainable and economical catalyst. This innovative approach eliminates the need for expensive metals and harsh chemicals. The natur…
View article: Advances in CO2 capture and separation materials: Emerging trends, challenges, and prospects for sustainable applications
Advances in CO2 capture and separation materials: Emerging trends, challenges, and prospects for sustainable applications Open
View article: Erratum to Synthesis, characterization, and antibacterial activity of novel pyrazole derivatives [Journal of Molecular Structure, Vol. 1332, p.141706, 2025]
Erratum to Synthesis, characterization, and antibacterial activity of novel pyrazole derivatives [Journal of Molecular Structure, Vol. 1332, p.141706, 2025] Open
View article: Polyvinyl Alcohol–Polyethylene Glycol Embedded Reduced Graphene Oxide Electronic Nose Sensor for Seafood Monitoring
Polyvinyl Alcohol–Polyethylene Glycol Embedded Reduced Graphene Oxide Electronic Nose Sensor for Seafood Monitoring Open
This study explores the development of an electronic nose (E-nose) sensor for fish freshness based on a composite of polyvinyl alcohol (PVA), polyethylene glycol (PEG), and reduced graphene oxide (rGO). The sensor leverages the unique prop…
View article: Polyvinyl Alcohol-Polyethylene Glycol Embedded Reduced Graphene Oxide Electronic Nose Sensor for Seafood Monitoring
Polyvinyl Alcohol-Polyethylene Glycol Embedded Reduced Graphene Oxide Electronic Nose Sensor for Seafood Monitoring Open
This study explores the development of an Electronic Nose (E-nose) sensor for fish freshness based on a composite of polyvinyl alcohol (PVA), polyethylene glycol (PEG), and reduced graphene oxide (rGO). The sensor leverages the unique prop…
View article: Economic Crisis and the Challenges of Knowledge Sharing and Collaborations Among Academics in Nigerian Higher Education
Economic Crisis and the Challenges of Knowledge Sharing and Collaborations Among Academics in Nigerian Higher Education Open
The global economic crisis has had a significant impact on the education sector with many higher institutions facing serious challenges, thus; reduced access to education which made students or learners to be unable to afford he rising cos…
View article: The Use of Carbon Dioxide as Working Fluid for a Single-Stage Mixed-Flow Turbine
The Use of Carbon Dioxide as Working Fluid for a Single-Stage Mixed-Flow Turbine Open
— The article considers the use of supercritical carbon dioxide (sCO 2 ) as working fluid in the turbine stage consisting of a vane row and a mixed-flow blade row. The operation of the existing turbine on natural gas combustion products an…
View article: Emerging Trends in Nickel Sulfide Electrodes for High‐Performance Supercapacitors: Synthesis, Mechanisms, and Nanocomposite Innovations
Emerging Trends in Nickel Sulfide Electrodes for High‐Performance Supercapacitors: Synthesis, Mechanisms, and Nanocomposite Innovations Open
Electrochemical supercapacitors (SCs) are increasingly recognized as pivotal in the field of energy storage, distinguished by their substantial specific capacitance, robust cyclic stability, and remarkable power density. These devices are …
View article: <p>Transformation of Madrasah Management: Strategy to Increase Public Trust in State Elementary Madrasah 1 Grobogan</p><div> <br></div>
Transformation of Madrasah Management: Strategy to Increase Public Trust in State Elementary Madrasah 1 Grobogan Open
View article: Enhanced Electrochemical Detection of Orthophosphate in Potable Water Using Zinc-Cobalt Oxide Nanocomposite-Modified Nickel Foam Electrodes
Enhanced Electrochemical Detection of Orthophosphate in Potable Water Using Zinc-Cobalt Oxide Nanocomposite-Modified Nickel Foam Electrodes Open
This study presents a novel approach to electrochemical detection of orthophosphate in potable water using hydrothermally synthesized nickel foam electrodes, modified with cobalt oxide (CoOx), zinc oxide (ZnOx), and zinc-cobalt oxide (ZnCo…
View article: Rosuvastatin calcium electrochemical sensor based on a sulfur doped graphitic carbon nitride modified glassy carbon electrode: A metal free analysis approach
Rosuvastatin calcium electrochemical sensor based on a sulfur doped graphitic carbon nitride modified glassy carbon electrode: A metal free analysis approach Open
View article: Nitrogen functionalized biomass derived mesoporous carbon nanomaterials for electrochemical detection of lead (II) ions
Nitrogen functionalized biomass derived mesoporous carbon nanomaterials for electrochemical detection of lead (II) ions Open
View article: Graphitic carbon nitride-PTD hybrid catalyst for efficient photocatalytic oxidative coupling of arylamine for the production of azoaromatic under visible light
Graphitic carbon nitride-PTD hybrid catalyst for efficient photocatalytic oxidative coupling of arylamine for the production of azoaromatic under visible light Open
View article: Influence of Deep Etching Surface Treatment to The Tensile Strength and Microstructure of Brazing Aluminium - Mild Steel
Influence of Deep Etching Surface Treatment to The Tensile Strength and Microstructure of Brazing Aluminium - Mild Steel Open
Since hard metals are among the materials that liquid brazing alloys scarcely adhere to, they should not be brazed without first removing the surface layer after sintering. The electrolytic etching method, which gives the surfaces of mater…
View article: Default mode network perturbations in Alzheimer's disease: an fMRI study in Klang Valley, Malaysia
Default mode network perturbations in Alzheimer's disease: an fMRI study in Klang Valley, Malaysia Open
The default mode network (DMN) is a large neural network that has a significant correlation with Alzheimer's disease (AD). Grey matter volume (GMV) and functional connectivity (FC) involving the regions of the DMN have been noted to differ…
View article: Challenges and Opportunities in Addressing Armed Banditry in Nigeria’s Northwest: Insights from the Field
Challenges and Opportunities in Addressing Armed Banditry in Nigeria’s Northwest: Insights from the Field Open
In recent years, the escalation of armed banditry in the northwestern region of Nigeria has reached alarming proportions, leading to significant loss of life and extensive property damage amounting to billions of Naira. While numerous stud…
View article: Enhancing oil–water emulsion separation via synergistic filtration using graphene oxide–silver oxide nanocomposite-embedded polyethersulfone membrane
Enhancing oil–water emulsion separation via synergistic filtration using graphene oxide–silver oxide nanocomposite-embedded polyethersulfone membrane Open
This study introduces an innovative approach for enhancing oil–water emulsion separation using a polyethersulfone (PES) membrane embedded with a nanocomposite of graphene oxide (GO) and silver oxide (AgO). The composite membrane, incorpora…
View article: Enhanced removal of iron (Fe) and manganese (Mn) ions from contaminated water using graphene oxide-decorated polyethersulphone membranes: Synthesis and characterization
Enhanced removal of iron (Fe) and manganese (Mn) ions from contaminated water using graphene oxide-decorated polyethersulphone membranes: Synthesis and characterization Open
This study addresses the urgent issue of water pollution caused by iron (Fe) and manganese (Mn) ions. It introduces an innovative approach using graphene oxide (GO) and GO-decorated polyethersulphone (PES) membranes to efficiently remove t…
View article: Synergistic electrochemical sensing of 2,4-dinitrotoluene via bimetallic nickel-cobalt oxide nanoparticles
Synergistic electrochemical sensing of 2,4-dinitrotoluene via bimetallic nickel-cobalt oxide nanoparticles Open
This study presents a comprehensive investigation into the synthesis, characterization, and application of an exceptionally sensitive electrochemical sensor designed for the ultrasensitive detection of 2,4-dinitrotoluene (DNT), a notorious…
View article: Novel Biosynthesis of Spherical Tungsten Trioxide Nanoparticles for Sustainable Photocatalytic Application
Novel Biosynthesis of Spherical Tungsten Trioxide Nanoparticles for Sustainable Photocatalytic Application Open