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Articles 181 - 210 of 197481

Full-Text Articles in Entire DC Network

Effects Of Co-Rotating Cylinders And Boundary Conditions On Heat And Mass Transfer In A Trapezoidal Enclosure, Olalekan Adebayo Olayemi, Olalekan Tajudeen Popoola, Leke Thaddeus Oladimeji, Isaac Kayode Adegun, Taofiq Omoniyi Amoloye, Oluwatayo Babatope Ojo, Benjamin Ohida Daniel, Michael Olabode Ibiwoye Sep 2026

Effects Of Co-Rotating Cylinders And Boundary Conditions On Heat And Mass Transfer In A Trapezoidal Enclosure, Olalekan Adebayo Olayemi, Olalekan Tajudeen Popoola, Leke Thaddeus Oladimeji, Isaac Kayode Adegun, Taofiq Omoniyi Amoloye, Oluwatayo Babatope Ojo, Benjamin Ohida Daniel, Michael Olabode Ibiwoye

Mathematical Modelling and Numerical Simulation with Applications

This study investigates the effects of rotational speed $(\Omega)$, Richardson number $\left(Ri\right)$, and Lewis number $\left(Le\right)$ on heat and mass transfer (HMT) around two co-rotating cylinders symmetrically situated in a trapezoidal enclosure. In the double-diffusive mechanism, the bottom wall of the trapezium is at a high temperature $\left(T_h\right)$ and concentration $\left(C_h\right)$, while the top wall is at a low temperature $\left(T_c\right)$ and concentration $\left(C_c\right)$. The side walls are perfectly insulated with zero mass flux, while the buoyancy ratio $\left(Br\right)$ is fixed at 1.0.  Two thermal-mass boundary scenarios are considered. Scenario 1: Cylinders are thermally insulated with zero mass flux, and …

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Biosensor Development In East Africa: A Systematic Review Of Technologies, Applications, Challenges, And Future Directions, Ally Mahadhy Sep 2026

Biosensor Development In East Africa: A Systematic Review Of Technologies, Applications, Challenges, And Future Directions, Ally Mahadhy

Tanzania Journal of Science

Biosensors integrate biological recognition elements with signal transduction systems to generate quantitative or semi-quantitative analytical information and have applications across healthcare, food safety, agriculture, environmental monitoring, and wildlife health. Despite substantial global advances, biosensor development in East Africa remains poorly characterized. This systematic review, conducted according to PRISMA 2020 guidelines, evaluated published evidence from 1995 to 2025 within a predefined East African Community geographical scope. Eligibility was based on IUPAC-aligned operational criteria requiring an integrated biological recognition element, transduction mechanism, and quantitative or semi-quantitative signal output. Three locally developed biosensors met the criteria: an electrochemical nano-biosensor for schistosomiasis diagnosis in …

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Effect Of Acid Pretreatment On The Adsorption Of Phenol Red By Cellulose Isolated From Sandbox (Hura Crepitans L.): Kinetics, Isotherms And Thermodynamics, Muibat O. Alabi-Abass, Najeem A. Adesola Babarinde, Adeola A. Ibikunle, Nurudeen O. Sanyaolu Sep 2026

Effect Of Acid Pretreatment On The Adsorption Of Phenol Red By Cellulose Isolated From Sandbox (Hura Crepitans L.): Kinetics, Isotherms And Thermodynamics, Muibat O. Alabi-Abass, Najeem A. Adesola Babarinde, Adeola A. Ibikunle, Nurudeen O. Sanyaolu

Tanzania Journal of Science

The removal of synthetic dyes from wastewater remains an urgent environmental concern due to their persistence and toxicity. This study evaluates cellulose from Hura crepitans (HC) and its acid-modified form (AHC) for the adsorption of phenol red (PR) dye from aqueous solutions. The adsorbents were characterized using FTIR to identify functional groups responsible for dye binding, XRD to determine the crystalline structure, SEM to examine surface morphology, and BET/BJH analyses to measure surface area and pore distribution. Acid modification enhanced surface roughness, porosity, and the abundance of active functional sites, leading to improved adsorption efficiency. Optimal conditions were pH 9.0 …

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Neutrosophic Indeterminacy-Transport Kolmogorov-Arnold Networks For Structured Uncertainty, Hafiz Muhammd Bilal, Kiran Naz, Anjum Ijaz Sep 2026

Neutrosophic Indeterminacy-Transport Kolmogorov-Arnold Networks For Structured Uncertainty, Hafiz Muhammd Bilal, Kiran Naz, Anjum Ijaz

Neutrosophic Systems with Applications

Kolmogorov-Arnold Networks (KANs) replace fixed node activations with learnable univariate edge functions, but standard KAN inference treats two equal-valued features identically even when one is accompanied by an explicit quality warning. NIT-KAN introduces a neutrosophic indeterminacy-transport mechanism for this setting. Each node carries an indeterminacy state in [0, 1]; a monotone gate g(I)=(1-I)α attenuates uncertain evidence on the predictive path, while a sensitivity-weighted transport rule carries indeterminacy through the underlying KAN computation. A terminal audit maps signed evidence to truth-support, falsity-support, and conflict-augmented indeterminacy without interpreting these quantities as class probabilities. We …

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Neutrokoopman: Channel-Preserving Koopman Spectral Analysis Of Nonlinear Dynamics With Truth, Indeterminacy, And Falsity Evidence, Ahmed Samy, Mohamed M. Abdelhafeez, K Venkatachalam, Mohamed Abouhawwash Sep 2026

Neutrokoopman: Channel-Preserving Koopman Spectral Analysis Of Nonlinear Dynamics With Truth, Indeterminacy, And Falsity Evidence, Ahmed Samy, Mohamed M. Abdelhafeez, K Venkatachalam, Mohamed Abouhawwash

Neutrosophic Systems with Applications

Modern dynamical systems increasingly operate with evidence that is not merely noisy but incomplete, contradictory, or only partially trustworthy. Conventional Koopman methods represent nonlinear dynamics through linear evolution of observables, while robust and adaptive variants address parameter and model uncertainty. They do not, however, preserve the semantic distinction between support, indeterminacy, and counter-support when those conditions are compressed into a single uncertainty variable. This paper develops NeutroKoopman, a channel-preserving Koopman framework in which the physical state is augmented by a single-valued neutrosophic evidence state νt = ( Tt,It,Ft ). Deterministic and Markovian formulations are …

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Molecular Identification Of Tannase-Producing Microbiota From Punica Granatum L. Peel, Ulugbek A. Suyundikov, Quchqor O. Dodayev, Munavvar A. Yakhyayeva, Zahro R. Akhmedova Akhmedova Sep 2026

Molecular Identification Of Tannase-Producing Microbiota From Punica Granatum L. Peel, Ulugbek A. Suyundikov, Quchqor O. Dodayev, Munavvar A. Yakhyayeva, Zahro R. Akhmedova Akhmedova

CHEMISTRY AND CHEMICAL ENGINEERING

Pomegranate (Punica granatum L.) is a rich source of bioactive compounds, including polyphenols, organic acids, and tannins. Pomegranate peel, a byproduct of processing, is of interest for microbiological research. The aim of this study was to produce the enzyme tannase and identify its microbiological producers. Results obtained using MALDI-TOF MS technology showed that fungi such as Aspergillus oryzae and Talaromyces albobiverticillius are the main producers with high enzymatic activity. The obtained scores (Aspergillus oryzae – 1,77; Talaromyces albobiverticillius – 2,33) confirm the reliability of the identification. Thus, the results of this study are of great importance for the selection of …

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Preparation Of Liposomes And Evaluation Of Their Toxic Properties, Aygul M. Yarilkaganova, Oybek N. Ashirоv, Otabek U. Allaev, Nigora А. Tosheva, Shakhnoz S. Azimova Sep 2026

Preparation Of Liposomes And Evaluation Of Their Toxic Properties, Aygul M. Yarilkaganova, Oybek N. Ashirоv, Otabek U. Allaev, Nigora А. Tosheva, Shakhnoz S. Azimova

CHEMISTRY AND CHEMICAL ENGINEERING

Liposomes are nanoscale vesicular systems composed of phospholipid bilayers capable of encapsulating both hydrophilic and hydrophobic molecules. The present study investigates the effect of temperature and repeated freeze–thaw (F/T) cycles on liposomal size, polydispersity and evaluates their cytotoxicity on MDSK cell lines using the MTT assay. Liposomes were prepared by the reverse-phase evaporation method and hydrated at different temperatures (30, 40, 50, and 60 °C). The samples were subjected to multiple F/T cycles (1–9×) to study their particle size and polydispersity index (PDI) were analyzed using dynamic light scattering (DLS). Cytotoxicity was tested using the MTT method on MDSK cell …

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Dft Study Of Vanadyl Acetylacetonate Complexes With Benzimidazole Derivatives And 2-Mercaptobenzothiazole, Xolida Jabborova, Shahlo Sh. Daminova Sep 2026

Dft Study Of Vanadyl Acetylacetonate Complexes With Benzimidazole Derivatives And 2-Mercaptobenzothiazole, Xolida Jabborova, Shahlo Sh. Daminova

CHEMISTRY AND CHEMICAL ENGINEERING

The geometric and electronic structures of the mixed-ligand complexes [VO(AcAc)2MBT], [VO(AcAc)2AFBI] and [VO(AcAc)2FBI] (MBT is 2-mercaptobenzothiazole, AFBI is 2-aminophenyl-1H-benzimidazole, FBI is 2-phenylmethyl-1H-benzimidazole) were studied by density functional theory ((U)B3LYP/6-311G(d,p)/LanL2DZ, Gaussian 09W). The MBT molecule was found to be planar, whereas in AFBI and FBI the NH group is coplanar with the imidazole ring. Analysis of effective atomic charges and molecular electrostatic potential maps shows that the pyridine-type nitrogen atoms of the imidazole and thiazole rings (q = −0.355 to −0.301 e) are the most probable coordination sites for the vanadyl ion. The HOMO–LUMO energy …

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Innovation Policy Of The Fuel And Energy Complex Of The Republic Of Uzbekistan: A Conceptual Model And An Integral Assessment Of Sustainable Technological Development, Botir Sh. Usmonov, Jahongir B. Shukurillaev Sep 2026

Innovation Policy Of The Fuel And Energy Complex Of The Republic Of Uzbekistan: A Conceptual Model And An Integral Assessment Of Sustainable Technological Development, Botir Sh. Usmonov, Jahongir B. Shukurillaev

CHEMISTRY AND CHEMICAL ENGINEERING

The competitiveness of a fuel and energy complex (FEC) increasingly depends less on resource endowment than on the capacity to generate, adopt and commercialise innovation. This paper develops a systemic conceptual model of innovative development for the FEC of the Republic of Uzbekistan and proposes a quantitative tool for its assessment. Drawing on national strategy documents, international-agency reports (IEA, IRENA, OECD) and the scholarly literature, the study applies systemic-structural analysis, international benchmarking, conceptual modelling and a composite-indicator method. The model represents the FEC as six interacting subsystems — state innovation policy, science and education, FEC enterprises, innovation infrastructure, digital transformation …

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Simulation Of Adsorption Of Aqueous Solution Of Methylene Blue On A Composite Of Phthalocyanine And Zinc Oxide, Albert R. Koldarov, Mastura Kh. Aripova, Odilzhon E. Abdurakhmonov, Zuhra Ch. Kadirova Sep 2026

Simulation Of Adsorption Of Aqueous Solution Of Methylene Blue On A Composite Of Phthalocyanine And Zinc Oxide, Albert R. Koldarov, Mastura Kh. Aripova, Odilzhon E. Abdurakhmonov, Zuhra Ch. Kadirova

CHEMISTRY AND CHEMICAL ENGINEERING

The aim of this work is to conduct a computer simulation of methylene blue adsorption from an aqueous solution onto a composite photocatalyst based on zinc oxide and zinc phthalocyanine. To understand the mechanisms of intermolecular interaction between the sorbates and the dominant crystal planes of the composite components, adsorption simulation was performed using the BIOVIA Adsorption Locator module. It is shown that the formation of the ZnO/ZnPc heterojunction promotes the synergistic stabilization of adsorbed molecules. The presence of the inorganic ZnO phase mitigates the electrostatic repulsion of chloride anions, ensuring the overall charge balance of the system, while the …

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Catalytic Effect Of Metal Ions On The Oxidation Of Thiocyanate Ions With Hydrogen Peroxide, Sarvar B. Rajabov, Salmon M. Mukhammadiev, Berdakh T. Daniyarov, Haci Deveci, Shahlo Sh. Daminova Sep 2026

Catalytic Effect Of Metal Ions On The Oxidation Of Thiocyanate Ions With Hydrogen Peroxide, Sarvar B. Rajabov, Salmon M. Mukhammadiev, Berdakh T. Daniyarov, Haci Deveci, Shahlo Sh. Daminova

CHEMISTRY AND CHEMICAL ENGINEERING

Thiocyanate (SCN⁻) ions, formed during the cyanidation of gold ores, pose a significant environmental problem when present in mine processing wastewater. In this study, the oxidation of potassium thiocyanate model solutions (10–1000 mg/L) with hydrogen peroxide, in the presence and absence of Cu2+ and Fe2+ ions, was investigated at room temperature. Residual SCN⁻ concentrations were determined by bromatometric titration and UV-spectroscopy. Without a catalyst, H2O2 showed the weakest effect at all concentrations, leaving 6–17% residual SCN⁻ even at the highest applied dose. The addition of Cu2+ and Fe2+ ions markedly accelerated oxidation via …

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Settling Method For Decolorization Of Low Molecular Weight Polyethylene, Adham E. Norkobilov, Ravshan I. Adilov, Bobur B. Aykhodjaev, Saparboy B. Yuldoshev, Lobar Sh. Kholmirzayeva Sep 2026

Settling Method For Decolorization Of Low Molecular Weight Polyethylene, Adham E. Norkobilov, Ravshan I. Adilov, Bobur B. Aykhodjaev, Saparboy B. Yuldoshev, Lobar Sh. Kholmirzayeva

CHEMISTRY AND CHEMICAL ENGINEERING

This study investigates the bleaching of low molecular weight polyethylene (LMWPE) by the settling (sedimentation) method. LMWPE is a by-product of polyethylene production whose discoloration is associated with trace amounts of conjugated, oxidized, and polar micro-fractions. The research was conducted in three stages: selection of the appropriate sample grade, determination of the optimal settling time, and evaluation of the temperature effect on the settling process. Results showed that only Grade-1 LMWPE samples are suitable for the settling method; Grade-2 samples yielded insufficient results and are recommended for bentonite adsorption treatment instead. Optimal settling conditions were established as 150 °C for …

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Structural And Physico-Mechanical Properties Of Geomembranes Based On Recycled Polyolefins Modified With Argillite From The Sherabad Deposit, Munisa N. Davronova, Furqat B. Eshkurbonov, Azim P. Khamidov, Asal A. Ashurova, Raykhona I. Abdullayeva Sep 2026

Structural And Physico-Mechanical Properties Of Geomembranes Based On Recycled Polyolefins Modified With Argillite From The Sherabad Deposit, Munisa N. Davronova, Furqat B. Eshkurbonov, Azim P. Khamidov, Asal A. Ashurova, Raykhona I. Abdullayeva

CHEMISTRY AND CHEMICAL ENGINEERING

This study investigated the effect of argillite, sourced from the local Sherabad deposit and modified with maleic anhydride, on the physical and mechanical properties of geomembranes based on recycled high-density polyethylene (r-HDPE), recycled low-density polyethylene (r-LDPE), and recycled polypropylene (r-PP). Maleic anhydride was used as a compatibilizer to ensure interfacial adhesion between the polymer matrix in the hydrophilic filler and the layered aluminosilicates, and to promote the uniform distribution of mineral particles. The experimental results showed that hybrid modification makes it possible to elevate the strength properties of all types of recycled polymers to the level of their virgin (pure) …

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Physical-Chemical Properties Of Nmgca-Fertilizers Obtained On The Basis Of Ammonium Nitrate And Vermiculite, Madiyar J. Jabbarbergenov Sep 2026

Physical-Chemical Properties Of Nmgca-Fertilizers Obtained On The Basis Of Ammonium Nitrate And Vermiculite, Madiyar J. Jabbarbergenov

CHEMISTRY AND CHEMICAL ENGINEERING

Although ammonium nitrate (AN) ranks second after urea among nitrogen fertilizers in terms of production and application volume, it remains the leading agent regarding plant nutrient uptake efficiency. This is primarily because nearly the entire total nitrogen content is assimilated in both ammonium (NH4+) and nitrate (NO3-) forms. However, the widespread agricultural utilization of AN is significantly constrained by several disadvantageous factors, including its physiological acidity, high hygroscopicity, caking tendency, low granule strength, thermal instability, and high explosive hazards. In this study, to enhance the commercial and physical-chemical properties of AN, a vermiculite mineral modifier was incorporated. The chemical composition …

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Improved Electromechanical Response And Relaxor Ferroelectric Behavior In (76–X)Bi₁/₂Na₁/₂Tio₃–24srtio₃ Ceramics Modified With Bifeo₃ And Bialo₃, Muhammadali K. Nigmatjanov, Farrukh B. Erkinov, Shoira A. Kadirniyazova Sep 2026

Improved Electromechanical Response And Relaxor Ferroelectric Behavior In (76–X)Bi₁/₂Na₁/₂Tio₃–24srtio₃ Ceramics Modified With Bifeo₃ And Bialo₃, Muhammadali K. Nigmatjanov, Farrukh B. Erkinov, Shoira A. Kadirniyazova

CHEMISTRY AND CHEMICAL ENGINEERING

Piezoelectric ceramics are smart functional materials capable of converting mechanical energy into electrical energy and vice versa, making them indispensable for modern sensors, transducers, and precision actuators. Historically dominated by lead-containing materials like Pb(Zr,Ti)O₃ (PZT), strict environmental regulations and health concerns have driven an urgent global shift toward eco-friendly alternatives. Currently, bismuth sodium titanate (Bi₁/₂Na₁/₂TiO₃–BNT)-based solid solutions are at the forefront of lead-free piezoceramic trends due to their excellent polarization and electromechanical coupling properties. In this study, lead-free piezoelectric ceramics based on the (76–x)Bi₁/₂Na₁/₂TiO₃–24SrTiO₃ (BNST24) system were synthesized, and their structural, dielectric, and electromechanical properties were systematically investigated. This study …

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Research Of The Binary Content Of Transition Metal Oxides Of Cu, Mo And W On The Properties Of Semi-Frit Glazes, Mihail V. Dyadenko, Ivan A. Levitskiy, Mastura Kh. Aripova Sep 2026

Research Of The Binary Content Of Transition Metal Oxides Of Cu, Mo And W On The Properties Of Semi-Frit Glazes, Mihail V. Dyadenko, Ivan A. Levitskiy, Mastura Kh. Aripova

CHEMISTRY AND CHEMICAL ENGINEERING

The results of a study of the binary content of transition metal oxides CuO + MoO3; CuO + WO3 and a combination of MoO3 + WO3 on the physico-chemical properties of glaze coatings and their antibacterial activity are presented. A polycomponent raw material composition has been studied, including aluminum-sulfate high-calcium frit, the indicated antibacterial components, as well as feldspar, dolomite, and additives of alumina, quartz sand, kaolin, and refractory clay. Optimal technological modes of preparation of suspensions, their application to a ceramic base, followed by firing at a temperature of 1200 ± 5 ° C have been determined. Decorative, physico-chemical …

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Context Matters: Evaluating Llm-Generated Knowledge Graph Schemas, Ritvik Garimella, Riju Marwah, Atishay Jain, Khusham Bansal, Amit Sheth Sep 2026

Context Matters: Evaluating Llm-Generated Knowledge Graph Schemas, Ritvik Garimella, Riju Marwah, Atishay Jain, Khusham Bansal, Amit Sheth

Publications

Knowledge graph (KG) schema engineering is labor-intensive and resists automation at scale. We investigate whether LLMs can generate domain-specific KG schemas of sufficient quality for downstream symbolic reasoning. We propose a tiered contextual framework that varies domain context richness across four levels: zero context, domain scope, task requirements, and data distribution. Generated schemas are evaluated intrinsically on BioRED (600 PubMed abstracts, multi-type entities and relations), where automated tiered schemas match an established KG construction baseline at 79.9% EC, with edge conformance rising from 47.5% at L1 to a stable 78–80% from L2 onward. Extrinsic evaluation on a 50-record MedHop controlled …

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Valorization Of Spent Vanadium Pentoxide Catalyst From The Sulfuric Acid Industry As An Economical Adsorbent For Crystal Violet Removal, Ibrahim Hamad Mr., Saddam Alaskary Mr., Abdel El-Mohsen Turky Prof., Nasser Mostafa Prof., Mai Hassan Roushdy Dr. Sep 2026

Valorization Of Spent Vanadium Pentoxide Catalyst From The Sulfuric Acid Industry As An Economical Adsorbent For Crystal Violet Removal, Ibrahim Hamad Mr., Saddam Alaskary Mr., Abdel El-Mohsen Turky Prof., Nasser Mostafa Prof., Mai Hassan Roushdy Dr.

Chemical Engineering

Around 150 000–200 000 tons of spent vanadium pentoxide catalyst (SVC) are generated annually by sulfuric acid plants and are landfilled for $80–150 per ton. It is demonstrated here as an unmodified, zero-cost adsorbent achieving 94.5% ± 0.3% crystal violet (CV) removal at an adsorbent dose of 6.3 g L−1 and an initial concentration of 38.5 mg L−1 , corresponding to a working capacity of 6.1 ± 0.2 mg g−1 with zero material cost and no pretreatment requirement. Physicochemical characterization by XRF, XRD, BET analysis, DLS, SEM-EDX, FTIR spectroscopy, TGA, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and zeta potential analysis …

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Experimental Study On The Behavior Of High-Strength Reinforced Concrete Beams With A Longitudinal Void, With And Without Micro Steel Fibers, At Different Shear Spans, Farah M. Hussein, Saif Altai, Shatha Alasadi, Ayoob A. Ibrahim, Arshad Nadhom Shubber Sep 2026

Experimental Study On The Behavior Of High-Strength Reinforced Concrete Beams With A Longitudinal Void, With And Without Micro Steel Fibers, At Different Shear Spans, Farah M. Hussein, Saif Altai, Shatha Alasadi, Ayoob A. Ibrahim, Arshad Nadhom Shubber

Journal of Sustainable Construction Materials and Technologies

This study examines the impact of creating a longitudinal void in high-strength reinforced concrete (RC) beams to decrease concrete volume. Testing involved three groups: solid beams (SB), beams with a 75 mm void (VB), and beams with a void incorporating 1.2% micro-steel fibers (VBSF), across various shear spans (a/d) of 1.8, 2.7, and 3.6. Results indicated that increased a/d led to a 54.2% reduction in peak loads and a 119.2% increase in deflection for solid beams. The void negatively affected load-bearing at a/d = 1.8 with a 25% peak load reduction and brittle failure. At a/d = 2.7, effects were …

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Chacahoula 2026, Volume 93, Pawan Khatri, Alayna Pellegrin Sep 2026

Chacahoula 2026, Volume 93, Pawan Khatri, Alayna Pellegrin

Chacahoula

The 2026 issue of Chacahoula, There's No Place Like Home, emphasizes the way in which our university becomes a home to students.  Featuring prize-winning poetry from Allyson Gee, Nick Fredrick, Amaris Kendall and Anmol Subedi, the book includes December 2025 and May 2026 graduating classes, as well as stunning photography of  campus life on the banks of Bayou Desiard. With features covering students, faculty, and staff, this year's time capsule preserves an academic year in the life of the University of Louisiana at Monroe. This edition includes a video message from President Carrie Castille. Download the PDF to your device …

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Survey Data For Decision Support Tool Development With A Focus On Emerging Design Spaces, Tyson Humphrey, Chris Mattson, Michael L. Anderson, Colin C. Engebretsen Sep 2026

Survey Data For Decision Support Tool Development With A Focus On Emerging Design Spaces, Tyson Humphrey, Chris Mattson, Michael L. Anderson, Colin C. Engebretsen

ScholarsArchive Data

This dataset contains the survey responses and PASE matrix used to support the derivation of nine development principles for decision support tools in emerging design spaces. The survey captures observations from a multidisciplinary DST development team, while the PASE matrix documents relationships among desired DST outcomes, architecture strategies, effects, and supporting literature.

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Increasing The Density Value Of Composite Propellant Ap/Htpb/Al For Rocket Performance Using The Sphere Packing Model, Muhammad Iqbal Alfikri, Bayu Prianto, Ariadne Lakshmidevi Juwono Sep 2026

Increasing The Density Value Of Composite Propellant Ap/Htpb/Al For Rocket Performance Using The Sphere Packing Model, Muhammad Iqbal Alfikri, Bayu Prianto, Ariadne Lakshmidevi Juwono

Makara Journal of Science

This research employs the sphere packing volume (SPV) model to optimize the density of composite propellants thereby enhancing rocket performance. We systematically varied the diameters of spherical ammonium perchlorate (AP) particles (50 and 400 µm) and aluminum powder (Al) particles (10 and 30 µm). These particles were incorporated at an ideal AP:Al ratio of 4:1 into a matrix of hydroxyl-terminated polybutadiene and toluene diisocyanate. By adjusting the AP ratio for each Al particle size and considering theoretical and tap densities, we precisely calculated the SPV value for each composition. The composition with the highest SPV value yielded remarkable results. This …

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Dense Platinum Nanoparticles Confined In Mn-N-C Nanocages For Robust Heavy-Duty Pemfcs, Lei Zhao, Zhen-Min Cao, Jia-Yu Zuo, Ming-Liang Yang, Hong-Yan Qiao, Jun-Song Chen, Rui Wu Sep 2026

Dense Platinum Nanoparticles Confined In Mn-N-C Nanocages For Robust Heavy-Duty Pemfcs, Lei Zhao, Zhen-Min Cao, Jia-Yu Zuo, Ming-Liang Yang, Hong-Yan Qiao, Jun-Song Chen, Rui Wu

Journal of Electrochemistry

High-loading Pt cathodes are essential for heavy-duty proton exchange membrane fuel cells but suffer from a critical tradeoff between ionomer sulfonate poisoning and nanoparticle instability. Herein, we report a spatial confinement strategy to encapsulate dense Pt nanoparticles (~51.8 wt%) within Mn/N-co-doped mesoporous carbon nanocages (denoted as Pt-MnNC). This architecture excludes bulky ionomers to create an ionomer-shielded environment against sulfonate poisoning, while Mn-Nx-mediated strong metal-support interactions anchor the Pt nanoparticles to prevent agglomeration and further boost durability. In the 5 × 5 cm2 membrane electrode assembly tests, the Pt-MnNC catalyst delivers an exceptional power density of 1.26 W·cm …

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Efficient Acidic H2O2 Electrosynthesis Over Co Atoms Anchored On Nitrogen-Doped Hierarchical Porous Carbon, Xiao Huang, Zi-Hao Zhan, Hao-Xu Niu, Guan-Yu Luo, Jin-Tao Huang, Bo-Xuan Jin, De-Li Wang Sep 2026

Efficient Acidic H2O2 Electrosynthesis Over Co Atoms Anchored On Nitrogen-Doped Hierarchical Porous Carbon, Xiao Huang, Zi-Hao Zhan, Hao-Xu Niu, Guan-Yu Luo, Jin-Tao Huang, Bo-Xuan Jin, De-Li Wang

Journal of Electrochemistry

The two-electron oxygen reduction reaction (2e− ORR) presents a promising route for the on-site production of hydrogen peroxide (H2O2), offering a green alternative to energy-consuming anthraquinone process. However, the high selectivity toward the competing 4e− ORR over the desired 2e− pathway leads to low Faradaic efficiency for H2O2, posing a critical challenge in catalyst design. In this work, a nitrogen-doped hollow hierarchical porous carbon with anchored Co atoms (CoN/HPC) was constructed for high-performance H2O2 production. The as-prepared Co-N/HPC catalyst showed excellent 2e− ORR performance, achieving …

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Engineering Small-Sized Cations With Strong Solvation For High-Voltage Supercapacitors, Tong Huo, Pan Liu, Hao Chen, Peng Zhang, Zhen-Lei Chen, Guo-Fu Sun, Zhi-Qiang Shi, Jing Wang Sep 2026

Engineering Small-Sized Cations With Strong Solvation For High-Voltage Supercapacitors, Tong Huo, Pan Liu, Hao Chen, Peng Zhang, Zhen-Lei Chen, Guo-Fu Sun, Zhi-Qiang Shi, Jing Wang

Journal of Electrochemistry

Supercapacitors (SCs) have attracted much attention in the field of energy storage due to their high power density and long cycle life. However, their relatively low energy density limits their application in a wider range of fields. Methods to increase energy density include enhancing specific capacitance and extending operating voltage window. Herein, we report a novel electrolyte salt, tetramethylammonium bis(fluorosulfonyl)imide (TMA-FSI), the resulting electrolyte formed with propylene carbonate (PC), designated as TMF, exhibited a wide electrochemical stability window (ESW) of 5.09 V. On the one hand, we found that the small size of TMA+ enables it to enter the …

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Experimental Investigation Of Internal Flow Structures And Permeate Flux Behaviour In Direct Contact Membrane Distillation, Ali Kandi, Mehdi Khiadani, Yujie Yuan, Abdellah Shafieian Sep 2026

Experimental Investigation Of Internal Flow Structures And Permeate Flux Behaviour In Direct Contact Membrane Distillation, Ali Kandi, Mehdi Khiadani, Yujie Yuan, Abdellah Shafieian

Research outputs 2022 to 2026

Understanding internal hydrodynamics of Direct Contact Membrane Distillation (DCMD) is crucial for desalination performance and mitigating temperature polarization. Despite its importance, quantitative experimental characterization of hydrodynamics governing boundary-layer development and transport enhancement within DCMD channels remains limited. This study presents the first spatially resolved Particle Image Velocimetry PIV measurement of velocity fields inside a smooth, actively operating flat-sheet DCMD channel, linking observed hydrodynamic structures to permeate flux. Two-dimensional velocity fields were captured at different streamwise positions for feed flow rates ranging from 0.7 to 4 L·min−1, enabling analysis of flow evolution and turbulence characteristics relevant to mass transfer. The results …

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Geotechnical Enhancement Of Noncohesive Coal Mine Overburden Using Microbially Induced Calcite Precipitation And Fly Ash Stabilization For Sustainable Pavement Applications, Atul Gautam, Laxmikant Yadu Sep 2026

Geotechnical Enhancement Of Noncohesive Coal Mine Overburden Using Microbially Induced Calcite Precipitation And Fly Ash Stabilization For Sustainable Pavement Applications, Atul Gautam, Laxmikant Yadu

Journal of Sustainable Mining

The majority of the waste generated from opencast mining, termed as overburden (OB), is dumped adjacent to the mine boundary and poses long-term stability issues. Various studies have been carried out to assess the risk of dump slope failure, and treatment strategies have been accordingly recommended to strengthen this OB dump. However, scant works are reported to sustainably utilize this OB for construction works. This study aims to quantify the performance of stabilized noncohesive coal mine OB collected from Gondegaon opencast mine (OCM) in India. Stabilization was achieved using two techniques, namely microbially induced calcite precipitation (MICP) through Sporosarcina pasteurii …

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Superiorgat: Graph Attention Networks For Sparse Lidar Point Cloud Reconstruction In Autonomous Systems, Khalfalla Awedat, Mohamed Abidalrekab, Gurcan Comert, Mustafa Ayad, Negash Begashaw Sep 2026

Superiorgat: Graph Attention Networks For Sparse Lidar Point Cloud Reconstruction In Autonomous Systems, Khalfalla Awedat, Mohamed Abidalrekab, Gurcan Comert, Mustafa Ayad, Negash Begashaw

Electrical and Computer Engineering Faculty Publications and Presentations

LiDAR-based perception in autonomous systems is fundamentally limited by sparse vertical sampling and further degraded by structured beam dropout caused by occlusions, sensor faults, or reduced-cost LiDAR hardware. These degradations disrupt vertical geometric continuity and negatively affect downstream perception tasks such as object detection, localization, and scene understanding. Existing reconstruction approaches often struggle to balance reconstruction accuracy with the computational efficiency required for real-time autonomous operation. This paper presents SuperiorGAT, a graph attention–based framework for reconstructing missing elevation information in sparse LiDAR point clouds under structured beam loss. The proposed method models LiDAR scans as beam-aware graphs and enhances standard …

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Scheduling The Charging Of Battery-Electric Vehicles Under Heterogeneous Scheduling Constraints, Justin Whitaker, Greg Droge, Mario Harper Sep 2026

Scheduling The Charging Of Battery-Electric Vehicles Under Heterogeneous Scheduling Constraints, Justin Whitaker, Greg Droge, Mario Harper

Electrical and Computer Engineering Student Research

Adopting battery electric vehicles (EVs) for vehicle fleets requires scheduling charging alongside day-to-day operations. This problem is complicated by complex utility cost structures, limited battery capacity, and competition for shared charging resources. Existing methods that simultaneously schedule routes and charging neither address the full cost structure nor employ high-fidelity charging models, and no prior work analyzes fleets containing vehicles with heterogeneous routing constraints. This work addresses these gaps by combining a state-of-the-art flexible-schedule formulation with time-of-use (TOU) demand costs and a non-linear, variable-rate charging model as drawn from additional state-of-the-art works. The proposed method is validated against two state-of-the-art methods, …

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Exploring Conceptions Of Engineering Design And Sustainability In Informal K–12 Engineering Education, Mobina Beheshti, Eunice Y. Kang, Avneet Hira Sep 2026

Exploring Conceptions Of Engineering Design And Sustainability In Informal K–12 Engineering Education, Mobina Beheshti, Eunice Y. Kang, Avneet Hira

Journal of Pre-College Engineering Education Research (J-PEER)

In this study we investigate K–12 students’ conceptualizations of sustainability, their perspectives on the role of engineers in sustainable practices, and how augmented reality (AR) can facilitate sustainability-oriented engineering design activities in informal settings. The AR technology used in this study includes the Merge Cube (a physical cube that serves as a digital canvas for AR) and CoSpaces Edu (an online platform that allows students to create 3D models and animate them using code). We employ a design-based research methodology, using qualitative narrative and artifact analysis to address the research questions: (1) What are students’ conceptions of sustainability and the …

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