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Artykuły w czasopismach na temat „Double Diffuse and Chemically Reaction”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

M.Umamaheswar, M.C.Raju, K. Varma S.V., and Sucharitha C. "MHD DOUBLE DIFFUSIVE AND CHEMICALLY REACTIVE FLUID FLOW THROUGH A ROTATING POROUS PLATE." International Journal of Research - Granthaalayah 5, no. 7 (2017): 363–73. https://doi.org/10.5281/zenodo.837828.

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In this paper MHD rotating double diffusive and chemically reactive fluid flow past a vertical porous plate with thermal radiation and heat absorption/generation is studied. The non-dimensional governing equations involved in the present analysis are solved by using finite difference technique. The effects of various physical parameters on velocity, temperature and concentration along with skin friction, the rate of heat transfer in the form of Nusselt number and the rate of mass transfer in the form of Sherwood number are studied through the graphs and tables.

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2

Loodts, V., H. Saghou, B. Knaepen, L. Rongy, and A. De Wit. "Differential Diffusivity Effects in Reactive Convective Dissolution." Fluids 3, no. 4 (2018): 83. http://dx.doi.org/10.3390/fluids3040083.

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When a solute A dissolves into a host fluid containing a reactant B, an A + B → C reaction can influence the convection developing because of unstable density gradients in the gravity field. When A increases density and all three chemical species A, B and C diffuse at the same rate, the reactive case can lead to two different types of density profiles, i.e., a monotonically decreasing one from the interface to the bulk and a non-monotonic profile with a minimum. We study numerically here the nonlinear reactive convective dissolution dynamics in the more general case where the three solutes can

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3

Saliba, Daniel, and Mazen Al-Ghoul. "Kinetics of intercalation of fluorescent probes in magnesium–aluminium layered double hydroxide within a multiscale reaction–diffusion framework." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2080 (2016): 20160138. http://dx.doi.org/10.1098/rsta.2016.0138.

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We report the synthesis of magnesium–aluminium layered double hydroxide (LDH) using a reaction–diffusion framework (RDF) that exploits the multiscale coupling of molecular diffusion with chemical reactions, nucleation and growth of crystals. In an RDF, the hydroxide anions are allowed to diffuse into an organic gel matrix containing the salt mixture needed for the precipitation of the LDH. The chemical structure and composition of the synthesized magnesium–aluminium LDHs are determined using powder X-ray diffraction (PXRD), thermo-gravimetric analysis, differential scanning calorimetry, solid-

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4

Li, Deyang, Lihui Fan, Min Qi, Yanming Shen, Dongbin Liu, and Shifeng Li. "Enhanced Visible-Light-Driven Photocatalytic Activity of ZnAl Layered Double Hydroxide by Incorporation of Co2+." Bulletin of Chemical Reaction Engineering & Catalysis 13, no. 3 (2018): 502. http://dx.doi.org/10.9767/bcrec.13.3.2168.502-511.

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Co-doped ZnAl layered double hydroxides (LDH) were papered by coprecipitation. The prepared samples were characterized by multiple techniques including X-ray Diffraction (XRD), Brunauer−Emmett−Teller (BET) surface area, Scanning Electronic Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS) and UV−Vis Diffuse-Reflectance Spectroscopy (UV−Vis DRS). The incorporation of Co2+ into the ZnAl LDH sheets as CrO6 octahedron forms a new energy level which contributes for the excitation of electrons under visible light. The doped Co2+ at a reasonable content

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5

Liu, Zixuan, Haoshen Huang, Zhengfei Chen, Haiyong He, Deyu Wang, and Zhoupeng Li. "Redox Mediators for Li2CO3 Decomposition." Inorganics 13, no. 6 (2025): 192. https://doi.org/10.3390/inorganics13060192.

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Lithium–air batteries (LABs) possess the highest energy density among all energy storage systems, and have drawn widespread interest in academia and industry. However, many arduous challenges are still to be conquered, one of them is Li2CO3, which is a ubiquitous product in LABs. It is inevitably produced but difficult to decompose; therefore, Li2CO3 is perceived as the “Achilles’ heel of LABs”. Among various approaches to addressing the Li2CO3 issue, developing Li2CO3-decomposing redox mediators (RMs) is one of the most convenient and versatile, because they can be electrochemically oxidized

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6

Khan, Muhammad Saqib, Jehanzeb Ali Shah, Nadia Riaz, et al. "Synthesis and Characterization of Fe-TiO2 Nanomaterial: Performance Evaluation for RB5 Decolorization and In Vitro Antibacterial Studies." Nanomaterials 11, no. 2 (2021): 436. http://dx.doi.org/10.3390/nano11020436.

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A photocatalytic system for decolorization of double azo reactive black 5 (RB5) dye and water disinfection of E. coli was developed. Sol gel method was employed for the synthesis of Fe-TiO2 photocatalysts and were characterized using thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), diffuse reflectance spectroscopy (DRS) and Brunauer–Emmett–Teller (BET) analysis. Results showed that photocatalytic efficiency was

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7

Tišler, Zdeněk, Pavla Vondrová, Kateřina Hrachovcová, et al. "Aldol Condensation of Cyclohexanone and Furfural in Fixed-Bed Reactor." Catalysts 9, no. 12 (2019): 1068. http://dx.doi.org/10.3390/catal9121068.

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Aldol condensation reaction is usually catalysed using homogeneous catalysts. However, the heterogeneous catalysis offers interesting advantages and the possibility of cleaner biofuels production. Nowadays, one of the most used kinds of heterogeneous catalysts are hydrotalcites, which belong to a group of layered double hydroxides. This paper describes the aldol condensation of cyclohexanone (CH) and furfural (F) using Mg/Al mixed oxides and rehydrated mixed oxides in order to compare the catalyst activity after calcination and rehydration, as well as the possibility of its regeneration. The c

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8

Zakhary, P. "³⁷Ar source on-demand production and deployment for low-energy nuclear recoil measurement in ReD liquid Argon TPC." Journal of Instrumentation 19, no. 06 (2024): C06003. http://dx.doi.org/10.1088/1748-0221/19/06/c06003.

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Abstract The search for light dark matter (< 10 GeV/c 2) has become increasingly important, since no conclusive evidence has been found in the higher dark matter (DM) mass region. In order to explore this light mass range, it is necessary to accurately model the response of the noble liquid time projection chamber (TPC) detectors, used in many experiments aimed at the direct measurement of DM, to low energy (< 1 keV) nuclear recoils (NRs). In this respect, 37Ar provides an ideal calibration source in the low-energy region due to its two low-energy peaks at 0.27 and 2.82 keV following ele

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9

Angkurarach, L., and P. Juijerm. "Effects of direct current field on powder-packed boriding process on martensitic stainless steel AISI 420." Archives of Metallurgy and Materials 57, no. 3 (2012): 799–804. http://dx.doi.org/10.2478/v10172-012-0087-3.

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The effects of direct current field on a powder-packed boriding process on a martensitic stainless steel AISI 420 have been investigated at a temperature of 900°C for about 2–6 hr. A powder-packed boriding process without direct current field (conventional powder-packed boriding process, PB) is a reference as compared to the powder-packed boriding process with applied current densities (PB-DC) of 60-170 mA/cm2. The microstructure and the presence of boride layers of PB and PB-DC were characterized using optical microscope and X-ray diffraction (XRD). The hardness values of the boride layer wer

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10

Amalanathan, Arputhasamy Joseph, Maciej Zdanowski, and Ramanujam Sarathi. "Streaming Electrification of Different Insulating Fluids in Power Transformers." Energies 15, no. 21 (2022): 8121. http://dx.doi.org/10.3390/en15218121.

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This paper presents a detailed review of the streaming electrification phenomena of different insulating fluids for power transformers. The comparison of different techniques used to assess the charging tendency of fluids is discussed depending on the flow type (planar or centrifugal), volume of oil, and interface material. The charge separation between the insulating fluid and metallic/pressboard interfaces is explained in terms of the electrical double layer formation involving a fixed layer and diffuse layer. Based on the experimental results, the streaming electrification is observed to be

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11

Song, Lin, Xin Zhang, Xiao Long Zeng, and Ming Yu Li. "Role of the Cathode in a Novel Photo-Electro-Chemical Catalytic Reactor." Advanced Materials Research 455-456 (January 2012): 985–90. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.985.

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A novel photo-electro-chemical catalytic reactor with single/double-tank was designed. TiO2/Ti thin film electrode was used as photo-anodes, graphite as cathode and a saturated calomel electrode (SCE) as the reference electrode in the reactor. The efficiency of photo-electro-chemical catalysis was enhanced because the target pollutant was degraded not only titanium dioxide electrode in anodic tank, but also hydrogen peroxide through reducing dissolved oxygen with graphite electrode in catholyte. Malachite green (MG) and crystal violet (CV) were degradated effectively in these two reactors. The

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12

Phan, Lien Thi Kim, Truong Tat Dang, and Hieu Van Tran. "Cloning and expression of human granulocyte-macrophage colony stimulating factor (hGM-CSF) in Pichia pastoris." Science and Technology Development Journal 16, no. 3 (2013): 22–29. http://dx.doi.org/10.32508/stdj.v16i3.1635.

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Granulocyte-macrophage colony stimulating factor (GM-CSF) is a glycoprotein, belongs to the family of colony stimulating factors (CSFs) that regulate proliferation and differentiation of hematopoietic cells. Recombinant hGM-CSF (rhGM-CSF) is one of FDA-appoved, therapeutic recombinant proteins that have been successfully used to treat many diseases like neutropenia, leukemia, or in combination with chemical therapy, etc. In this study, we reported the production of rhGM-CSF in methylotrophic yeast Pichia pastoris through secretory expression using the inducible AOX1 promoter. The gene hgm-csf

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13

Om, P. Suthar, and S. Jagadeesh Kumar M. "Mathematical modeling of chemical reaction on the onset of modulated thermo-solutal convection in a porous layer." Journal of Indian Chemical Society Vol. 92, Jun 2015 (2015): 1019–22. https://doi.org/10.5281/zenodo.5674676.

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Fluid Dynamics Division, School of Advanced Sciences, VIT University, Vellore-632 014, Tamilnadu, India <em>E-mail</em> : jagajith@yahoo.com, ompsuthar@aol.com The onset of thermo-solutal convection in a fluid-saturated porous layer is studied when the chemical equilibrium on the bounding surfaces and the solubility of the dissolved components depend on temperature. Sinusoidal vertical vibrations to the system are assumed to affect a time-dependent gravitational field for the onset of natural convection. A linear stability analysis is performed to obtain the Rayleigh number as a function of sy

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14

Khan, Muhammad Saqib, Jehanzeb Ali Shah, Muhammad Arshad, et al. "Photocatalytic Decolorization and Biocidal Applications of Nonmetal Doped TiO2: Isotherm, Kinetic Modeling and In Silico Molecular Docking Studies." Molecules 25, no. 19 (2020): 4468. http://dx.doi.org/10.3390/molecules25194468.

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Textile dyes and microbial contamination of surface water bodies have been recognized as emerging quality concerns around the globe. The simultaneous resolve of such impurities can pave the route for an amicable technological solution. This study reports the photocatalytic performance and the biocidal potential of nitrogen-doped TiO2 against reactive black 5 (RB5), a double azo dye and E. coli. Molecular docking was performed to identify and quantify the interactions of the TiO2 with β-lactamase enzyme and to predict the biocidal mechanism. The sol-gel technique was employed for the synthesis

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15

Awad, Ibrahim M. A., and Khairy M. Hassan. "Studies in Vilsmeier-Haack reaction: Reaction of 3-methyl-1-phenyl-4-arylidene-5-pyrazolone." Collection of Czechoslovak Chemical Communications 54, no. 3 (1989): 706–12. http://dx.doi.org/10.1135/cccc19890706.

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The 3-methyl group in Ia, b has been found to undergo diformylation by Vilsmeier reagent to give the aminoacrolein derivatives (IIa, b). Treatment of IIa, b with different reagents affords the related 1-phenyl-4-arylidene-5-pyrazolone derivatives with different heterocyclic systems in the 3-position. The Vilsmeier reaction on pyrazolopyrazole (XIII) have been utilized to prove chemically that new heterocyclic systems are formed only at the 3-position and no addition on the carbon-carbon double bond in the conjugated system O=C-C=C-(B) takes place.

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16

Prabhu, Vivek M., Shuhui Kang, R. Joseph Kline, et al. "Characterization of the Non-uniform Reaction in Chemically Amplified Calix[4]resorcinarene Molecular Resist Thin Films." Australian Journal of Chemistry 64, no. 8 (2011): 1065. http://dx.doi.org/10.1071/ch11242.

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The ccc stereoisomer-purified tert-butoxycarbonyloxy-protected calix[4]resorcinarene molecular resists blended with photoacid generator exhibit a non-uniform photoacid-catalyzed reaction in thin films. The surface displays a reduced reaction extent, compared with the bulk, with average surface-layer thickness 7.0 ± 1.8 nm determined by neutron reflectivity with deuterium-labelled tert-butoxycarbonyloxy groups. Ambient impurities (amines and organic bases) are known to quench surface reactions and contribute, but grazing-incidence X-ray diffraction shows an additional effect that the protected

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17

Braukhoff, Marcel, Amit Einav, and Bao Quoc Tang. "Quantitative dynamics of irreversible enzyme reaction–diffusion systems ^*." Nonlinearity 35, no. 4 (2022): 1876–926. http://dx.doi.org/10.1088/1361-6544/ac4d84.

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Abstract In this work we investigate the convergence to equilibrium for mass action reaction–diffusion systems which model irreversible enzyme reactions. Using the standard entropy method in this situation is not feasible as the irreversibility of the system implies that the concentrations of the substrate and the complex decay to zero. The key idea we utilise in this work to circumvent this issue is to introduce a family of cut-off partial entropy-like functionals which, when combined with the dissipation of a mass like term of the substrate and the complex, yield an explicit exponential conv

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18

Feng, Ying, Junjie Su, Cuimei Zhang, Jingjun Li та Jiruo Zhao. "REACTION MECHANISM OF NAH WITH THE STRUCTURAL UNIT OF BUTYL RUBBER RESEARCH THROUGH THE α-PINENE MODEL COMPOUND METHOD". Rubber Chemistry and Technology 88, № 4 (2015): 628–39. http://dx.doi.org/10.5254/rct.15.84898.

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ABSTRACT We substituted the small molecular model compound α-pinene of butyl rubber (IIR) to simulate the reaction between sodium hydride (NaH) and the isoprene structural unit of IIR. Meanwhile, we provided reference data on the reaction mechanism and reaction degree for the modified reaction of IIR with an active carboanion-based center. In this way, possible chemically modified reaction pathways of IIR were studied. 1H nuclear magnetic resonance results showed that α-pinene and the structural unit of IIR have a very high degree of similarity. NaH can not only produce the substitution reacti

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19

Jahromy, Yaser Nejaty. "Solution Tetrahydrobiopterin Radical vs. the Enzyme-Bound Radical: A Paramagnetic Reconciliation." Current Chemical Biology 15, no. 4 (2021): 319–30. http://dx.doi.org/10.2174/2212796816666211221095934.

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Background: Nitric oxide synthase (NOS) catalyzes the formation of nitric oxide (NO) and citrulline from L-arginine, dioxygen (O2), and nicotinamide adenine dinucleotide phosphate (NADPH) in a two-step reaction, with the enzyme-bound intermediate Nω-hydroxy-L-arginine (NHA). Previous electron paramagnetic resonance (EPR) studies of NOS reaction have shown that (6R, 1'R, 2'S)-6-(l',2'-dihydroxypropyl)-5,6,7,8-tetrahydropterin (H4B) acts as a single electron donor in both steps of the reaction, resulting in the transient generation of a tetrahydropterin cation radical (H4B•+). Results: H4B•+ can

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20

DEWEY, T. GREGORY. "CHEMICALLY-CONTROLLED REACTION KINETICS ON FRACTALS: APPLICATION TO HYDROGEN EXCHANGE IN LYSOZYME." Fractals 03, no. 02 (1995): 251–67. http://dx.doi.org/10.1142/s0218348x95000217.

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The effect of time-dependent diffusional rate constants on chemically-controlled reactions in solution is considered. A general mechanism is examined that consists of a two step process. First the reactants diffuse together to form an “encounter complex.” This is followed by the collapse of the complex to the final product. The first step is diffusion controlled and the second step is chemically controlled. For reactions in restricted geometries or on fractals the rate constants associated with the diffusive process will scale with time as t−h where h is a constant between 0 and 1. The chemica

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21

Jeoung, Jae-Hun, and Holger Dobbek. "ATP-dependent substrate reduction at an [Fe8S9] double-cubane cluster." Proceedings of the National Academy of Sciences 115, no. 12 (2018): 2994–99. http://dx.doi.org/10.1073/pnas.1720489115.

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Chemically demanding reductive conversions in biology, such as the reduction of dinitrogen to ammonia or the Birch-type reduction of aromatic compounds, depend on Fe/S-cluster–containing ATPases. These reductions are typically catalyzed by two-component systems, in which an Fe/S-cluster–containing ATPase energizes an electron to reduce a metal site on the acceptor protein that drives the reductive reaction. Here, we show a two-component system featuring a double-cubane [Fe8S9]-cluster [{Fe4S4(SCys)3}2(μ2-S)]. The double-cubane–cluster-containing enzyme is capable of reducing small molecules, s

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22

Anjum, Aisha, Sadaf Masood, Muhammad Farooq, Naila Rafiq, and Muhammad Yousaf Malik. "Investigation of binary chemical reaction in magnetohydrodynamic nanofluid flow with double stratification." Advances in Mechanical Engineering 13, no. 5 (2021): 168781402110162. http://dx.doi.org/10.1177/16878140211016264.

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This article addresses MHD nanofluid flow induced by stretched surface. Heat transport features are elaborated by implementing double diffusive stratification. Chemically reactive species is implemented in order to explore the properties of nanofluid through Brownian motion and thermophoresis. Activation energy concept is utilized for nano liquid. Further zero mass flux is assumed at the sheet’s surface for better and high accuracy of the out-turn. Trasnformations are used to reconstruct the partial differential equations into ordinary differential equations. Homotopy analysis method is utiliz

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23

Oezaslan, Mehtap, Sawsan Ibrahim, Alexandra Dworzak, Daniel Crespo, Frank Renner, and Carsten Dosche. "Nanoporous Copper Ribbons Prepared By Chemical Dealloying of a Melt-Spun Zn-Cu Alloy." ECS Meeting Abstracts MA2022-02, no. 13 (2022): 787. http://dx.doi.org/10.1149/ma2022-0213787mtgabs.

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Dealloying process is a powerful and versatile method to fabricate three-dimensional nanoporous (np) materials for applications in electrochemical synthesis, sensors, and catalysis. In the last years, several morphologies of np-copper and their dealloying mechanisms have been reported in alkaline and acidic media.[1-4] For instance, the nature of anions such as chloride and phosphate strongly influence the ligament size of np-Cu. The effects of several experimental parameters to control the structural and chemical properties of np-Cu materials via dealloying are not fully understood to date. I

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24

Thumma, Thirupathi, O. Anwar Beg, and Siva Reddy Sheri. "Finite element computation of transient dissipative double diffusive magneto-convective nanofluid flow from a rotating vertical porous surface in porous media." Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanomaterials, Nanoengineering and Nanosystems 231, no. 2 (2017): 89–108. http://dx.doi.org/10.1177/2397791417712856.

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This article aimed to investigate the transient dissipative magnetohydrodynamic double diffusive free convective boundary layer flow of electrically conducting nanofluids from a stationary or moving vertical porous surface in a rotating high permeability porous medium, considering buoyancy, thermal radiation and first-order chemical reaction. Thermo-diffusion (Soret) and diffuso-thermo (Dufour) effects are also considered. Darcy’s law is employed. The mathematical model is formulated by considering water-based nanofluids containing metallic nano-particles for both stationary and moving plate c

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Bordina, Galina E., Nadezhda P. Lopina, Gleb S. Parshin, Alexey A. Andreev, and Ilya A. Nekrasov. "Mechanism of light polymerization of composites." Russian Journal of Dentistry 26, no. 2 (2022): 163–70. http://dx.doi.org/10.17816/1728-2802-2022-26-2-163-170.

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BACKGROUND: The article presents a review of the chemical aspects of the reaction of light polymerization of composites in dental practice. This reaction refers to free radical polymerization reactions, with photons as activators. In dentistry, composites are classified as chemically cured, light cured, doubly cured, and thermally cured. This depends on the origin of the activation energy of free radical polymerization of methacrylates. Chemically, dental composites are usually a mixture of four main components: an organic polymer matrix, an inorganic filler, an appret compound, a binder matri

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Mallawi, Fouad, Sheniyappan Eswaramoorthi, Marimuthu Bhuvaneswari, and Sivanandam Sivasankaran. "Impact of double-diffusion and slip of order 2 on convection of chemically reacting Oldroyd-B liquid with Cattaneo-Christov dual flux." Thermal Science, no. 00 (2020): 214. http://dx.doi.org/10.2298/tsci191003214m.

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This article express the outcomes of mixed convective flow of a chemically reacting Oldroyd-B liquid (OBL) with Cattaneo-Christov double flux (CCDF) under the consequence of second order slip (SS), heat absorption (HA)/heat generation (HG) and Newtonian cooling (NC)/Newtonian heating (NH). The governing PDEs are converted into ODEs using suitable variables. The homotopy analysis method (HAM) is employed to solve these resultant equations. The outcomes of diverse physical parameters, like, relaxation time, retardation time, Richardson number, buoyancy ratio, Prandtl number, radiation, heat abso

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Jeung, Do-Gak, Tae-Hyun Kim, and Jae-Min Oh. "Homogeneous Incorporation of Gallium into Layered Double Hydroxide Lattice for Potential Radiodiagnostics: Proof-of-Concept." Nanomaterials 11, no. 1 (2020): 44. http://dx.doi.org/10.3390/nano11010044.

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Trivalent gallium ion was successfully incorporated into chemically well-defined MgAl-layered double hydroxide (LDH) frameworks through postsynthetic hydrothermal treatment. Quantitative analysis with inductively coupled plasma-mass spectroscopy exhibited that Ga3+ was first incorporated into LDH through partial dissolution-precipitation at the edge of LDH particle and homogeneously distributed throughout the particle by substitution of Ga3+ for Al3+ in LDH frame works. The powder X-ray diffraction patterns showed that the Ga3+ incorporation did not affect the crystal structure without evoluti

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Abreu, Norberto J., Héctor Valdés, Claudio A. Zaror, Tatianne Ferreira de Oliveira, Federico Azzolina-Jury, and Frédéric Thibault-Starzyk. "Evidence of Synergy Effects between Zinc and Copper Oxides with Acidic Sites on Natural Zeolite during Photocatalytic Oxidation of Ethylene Using Operando DRIFTS Studies." Catalysts 13, no. 3 (2023): 610. http://dx.doi.org/10.3390/catal13030610.

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In this article, the role of surface sites of modified zeolites with semiconductor nanoparticles as alternative photocatalyts for protecting post-harvest foodstuff from the detrimental effects of ethylene is addressed. Two single and one double catalyst based on zinc and copper oxides supported over modified zeolite samples were prepared. Physical, chemical, and surface properties of prepared materials were studied by several characterization methods. UV-Vis absorption spectra show that the applied modification procedures increase the optical absorption of light in the UV and visible regions,

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Greeley, Jeffrey, Siddharth Deshpande, Brady Dupleiss, and Zhenhua Zeng. "(Invited) First Principles Treatments of Oxygenate Electrooxidation – Structure Sensitivity and Influence of Solvent on Chemically Diverse Elementary Reaction Steps." ECS Meeting Abstracts MA2024-02, no. 61 (2024): 4082. https://doi.org/10.1149/ma2024-02614082mtgabs.

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Advances in the theoretical understanding of electrochemical systems have, over the past decade, led to growing use of periodic Density Functional Theory (DFT) studies to treat a surprisingly large ensemble of electrocatalytic reactions, ranging from carbon dioxide electroreduction to oxygen evolution. Many such studies have employed simplified models of the electrochemical environment to determine reactivity trends across a broad space of catalytic materials, while other efforts have focused on developing detailed descriptions of electrochemical phenomena, such as the structure of electrochem

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Mcmurtry, P. A., J. J. Riley, and R. W. Metcalfe. "Effects of heat release on the large-scale structure in turbulent mixing layers." Journal of Fluid Mechanics 199 (February 1989): 297–332. http://dx.doi.org/10.1017/s002211208900039x.

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The effects of chemical heat release on the large-scale structure in a chemically reacting, turbulent mixing layer are investigated using direct numerical simulations. Three-dimensional, time-dependent simulations are performed for a binary, single-step chemical reaction occurring across a temporally developing turbulent mixing layer. It is found that moderate heat release slows the development of the large-scale structures and shifts their wavelengths to larger scales. The resulting entrainment of reactants is reduced, decreasing the overall chemical product formation rate. The simulation res

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Adam, G., A. Šebenik, U. Osredkar, Z. Veksli, and F. Ranogajec. "Grafting of Waste Rubber." Rubber Chemistry and Technology 63, no. 5 (1990): 660–68. http://dx.doi.org/10.5254/1.3538280.

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Abstract By the redox method and by gamma irradiation, it was possible to graft ethyl acrylate on to granulate of waste rubber. The quantity of grafted monomer was larger when gamma irradiation was used. When combining ethyl acrylate with 5-methylene-2-norbornene in the redox system with the intention to introduce more double bonds in the grafted granulate, it was found that norbornene does not participate in the reaction and that it even prevents the grafting of ethyl acrylate. This is just a part of extensive experimental work which was done with the intention to chemically modify the rubber

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Povarova, Elena, Anna Pylinina, Irina Mikhalenko та Marina Safronenko. "ACTIVITY OF Bi4V2-2XCu2XO11–Δ IN THE TRANSFORMATION OF ISOBUTANOL AFTER PLASMA-CHEMICAL TREATMENT". Acta Metallurgica Slovaca 24, № 1 (2018): 75–81. https://doi.org/10.36547/ams.24.1.252.

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The catalytic properties of plasma-chemically and thermally treated Bi4V2-2xCu2xO11–δ with х= 0.00–0.16 (BICUVOX) in the transformation of isobutanol are studied. Plasma treatments lead to the total deactivation of the active sites of dehydration reaction, and the alcohol is converted with 100% selectivity into aldehyde. Activity of the dehydrogenation of alcohol after PCT increases in ~ 1.7 times on samples with xCu=0.04-0.06 (. phases) compared to the initial samples. Similar values which were found for the samples with xCu=0.0-0.06, including the double vanadate, suggests that PCT affects

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Mahmoud, Mohamed E., Maher M. Osman, Somia B. Ahmed, and Tarek M. Abdel-Fattah. "Enhanced Removal of Lead by Chemically and Biologically Treated Carbonaceous Materials." Scientific World Journal 2012 (2012): 1–11. http://dx.doi.org/10.1100/2012/604198.

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Hybrid sorbents and biosorbents were synthesized via chemical and biological treatment of active carbon by simple and direct redox reaction followed by surface loading of baker’s yeast. Surface functionality and morphology of chemically and biologically modified sorbents and biosorbents were studied by Fourier Transform Infrared analysis and scanning electron microscope imaging. Hybrid carbonaceous sorbents and biosorbents were characterized by excellent efficiency and superiority toward lead(II) sorption compared to blank active carbon providing a maximum sorption capacity of lead(II) ion as

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Natsch, Stephanie, Mattheus HAM Vinks, Adrianne K. Voogt, Eric B. Mees, and Ronald HB Meyboom. "Anaphylactic Reactions to Proton-Pump Inhibitors." Annals of Pharmacotherapy 34, no. 4 (2000): 474–76. http://dx.doi.org/10.1345/aph.19235.

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OBJECTIVE: To report two cases of anaphylactic reactions to proton-pump inhibitors (PPIs). CASE SUMMARIES: A 54-year-old woman who had taken omeprazole in the past was treated with omeprazole 40 mg and developed periorbital edema, edema of the skin, pruritus, nausea, and vomiting about 45 minutes after taking one capsule. Five months later, she was treated with lansoprazole 30-mg capsules. Again, within 45 minutes she developed an even more serious reaction, with pruritus and urticaria on her whole body, increased sweating, facial edema, and loss of consciousness. A 61-year-old man took one ta

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Kim, Dong Wook, Beum Jin Park, Youngkwon Kim, and Ho Seok Park. "Cr-Doped NiCo-Layered Double Hydroxide/N-Doped Graphene for a Bifunctional Electrocatalyst for Rechargeable Zinc Air Batteries." International Journal of Energy Research 2023 (February 3, 2023): 1–14. http://dx.doi.org/10.1155/2023/6327620.

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Rechargeable zinc air batteries (RZABs), which repeatedly store and release charges through the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) using oxygen electrocatalysts, are considered a promising energy storage system owing to their low cost and safety. Controlling the chemical structure and morphology of multifunctional electrocatalysts is crucial for improving their electrocatalytic activities and stabilities for high performance RZABs. Herein, we report hierarchically structured Cr-doped NiCo-layered double hydroxides (LDHs) nanoplates chemically grown on the surfa

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Wouterlood, F. G., J. G. Bol, and H. W. Steinbusch. "Double-label immunocytochemistry: combination of anterograde neuroanatomical tracing with Phaseolus vulgaris leucoagglutinin and enzyme immunocytochemistry of target neurons." Journal of Histochemistry & Cytochemistry 35, no. 8 (1987): 817–23. http://dx.doi.org/10.1177/35.8.2439583.

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By the neuroanatomical tracing technique based on uptake, transport, and immunocytochemical detection of injected Phaseolus vulgaris leucoagglutinin (PHA-L), fiber trajectories of labeled neurons can be followed with great accuracy to their termination areas. To further analyze the connectivity of these fibers, the target neurons must be chemically characterized. In vibratome and frozen sections of rat brain, we tried to visualize PHA-L-labeled fibers and, simultaneously, the target neuron-related antigen. As a model system we used the projection from the pre-frontal cortex to histaminergic ne

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Blumbergs, Ervins, Vera Serga, Andrei Shishkin, et al. "Selective Disintegration–Milling to Obtain Metal-Rich Particle Fractions from E-Waste." Metals 12, no. 9 (2022): 1468. http://dx.doi.org/10.3390/met12091468.

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Various metals and semiconductors containing printed circuit boards (PCBs) are abundant in any electronic device equipped with controlling and computing features. These devices inevitably constitute e-waste after the end of service life. The typical construction of PCBs includes mechanically and chemically resistive materials, which significantly reduce the reaction rate or even avoid accessing chemical reagents (dissolvents) to target metals. Additionally, the presence of relatively reactive polymers and compounds from PCBs requires high energy consumption and reactive supply due to the forma

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Novák, Jan, Jan Kopecký, and Zdenko Vaněk. "Nitrogen source regulates expression of alanine dehydrogenase isoenzymes in Streptomyces avermitilis in a chemically defined medium." Canadian Journal of Microbiology 43, no. 2 (1997): 189–93. http://dx.doi.org/10.1139/m97-024.

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Ammonium ions and alanine influence production of the macrolide avermectin in Streptomyces avermitilis. L-Alanine dehydrogenase and alanine aminotransferase are the primary enzymes responsible for regulating the intracellular concentration of alanine and also of ammonium ions. In cultures of S. avermitilis in a chemically defined medium with ammonia or L-alanine as the only nitrogen source, specific activities of both enzymes increased during growth. The alanine dehydrogenase specific activity increased more than 86-fold after the culture was supplemented with 0.2% L-alanine and 5-fold after a

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Kousar, N., Taher A. Nofal, W. Tahir, S. M. Bilal, and Ndolane Sene. "Impact of Ferromagnetic Nanoparticles Submerged in Chemically Reactive Viscoelastic Fluid Transport Influenced by Double Magnetic Dipole." Journal of Nanomaterials 2022 (April 1, 2022): 1–12. http://dx.doi.org/10.1155/2022/2558419.

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The present article summarized the effects of double magnetic dipole for chemically reactive viscoelastic fluid in the presence of two different ferromagnetic particles, namely, nickel zinc ferrite N i Z n F e 2 O 4 and magnetite ferrite ( F e 3 O 4 ). Due to double magnetic dipole, an external magnetic field is applied normal to the flow. Blood is used as base fluid due to its viscoelastic fluid properties. The Cattaneo-Christov heat flux model is used for heat transport phenomena. The physical model is formulated in the form of partial differential equations which are then converted into ord

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Yutkin, Maxim P., Himanshu Mishra, Tadeusz W. Patzek, John Lee, and Clayton J. Radke. "Bulk and Surface Aqueous Speciation of Calcite: Implications for Low-Salinity Waterflooding of Carbonate Reservoirs." SPE Journal 23, no. 01 (2017): 84–101. http://dx.doi.org/10.2118/182829-pa.

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Summary Low-salinity waterflooding (LSW) is ineffective when reservoir rock is strongly water-wet or when crude oil is not asphaltenic. Success of LSW relies heavily on the ability of injected brine to alter surface chemistry of reservoir crude-oil brine/rock (COBR) interfaces. Implementation of LSW in carbonate reservoirs is especially challenging because of high reservoir-brine salinity and, more importantly, because of high reactivity of the rock minerals. Both features complicate understanding of the COBR surface chemistries pertinent to successful LSW. Here, we tackle the complex physicoc

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Levey, A. I., J. P. Bolam, D. B. Rye, et al. "A light and electron microscopic procedure for sequential double antigen localization using diaminobenzidine and benzidine dihydrochloride." Journal of Histochemistry & Cytochemistry 34, no. 11 (1986): 1449–57. http://dx.doi.org/10.1177/34.11.2430010.

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Very few double-antigen staining methods are available that are applicable to both light and electron microscopy. The objective of this study was to develop for localization of two neural antigens simultaneously a procedure which would be sensitive, simple to perform, offer permanent reaction products, and permit correlated light and ultrastructural analysis. The method employs sequential immunoperoxidase staining without antibody elution, in which the first sequence of antibodies is visualized with 3,3'-diaminobenzidine (DAB) and the second with benzidine dihydrochloride (BDHC). The DAB react

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Bég, O. Anwar, R. Bhargava, S. Rawat, H. S. Takhar, and Tasweer A. Bég. "A Study of Steady Buoyancy-Driven Dissipative Micropolar Free Convection Heat and Mass Transfer in a Darcian Porous Regime with Chemical Reaction." Nonlinear Analysis: Modelling and Control 12, no. 2 (2007): 157–80. http://dx.doi.org/10.15388/na.2007.12.2.14707.

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In the present paper we examine the steady double-diffusive free convective heat and mass transfer of a chemically-reacting micropolar fluid flowing through a Darcian porous regime adjacent to a vertical stretching plane. Viscous dissipation effects are included in the energy equation. Assuming incompressible, micro-isotropic fluid behaviour the transport equations are formulated in a two-dimensional coordinate system (x, y) using boundary-layer theory. The influence of the bulk porous medium retardation is modeled as a drag force term in the translational momentum equation. Transformations re

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W. A., Okuyade Ighoroje, and Irhiakuma Chris T. "MHD Thermally Radiating Flow through Two Parallel Vertical Plates Channel in the Presence of Chemical Reaction, Hall, Joule, and Cross- Diffusion Effects." WSEAS TRANSACTIONS ON HEAT AND MASS TRANSFER 19 (December 31, 2024): 133–49. https://doi.org/10.37394/232012.2024.19.14.

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MHD thermally radiating flow through two parallel vertical plate channels in the presence of chemical reaction, Hall, Joule, and cross-diffusion effects are examined. The fluid is assumed chemically reactive, electrically conducting, magnetically susceptible, viscous, incompressible, and Newtonian; the plates are porous, electrically conductive, and heated to a high-temperature regime to generate thermal rays. The flow system is highly interactive such that cross/double diffusion effects are present. The governing partial differential equations are solved by the method of Modified Homotopy Per

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Badazhkova, Veronika D., Sergei V. Raik, Dmitry S. Polyakov, Daria N. Poshina, and Yury A. Skorik. "Effect of Double Substitution in Cationic Chitosan Derivatives on DNA Transfection Efficiency." Polymers 12, no. 5 (2020): 1057. http://dx.doi.org/10.3390/polym12051057.

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Recently, much effort has been expended on the development of non-viral gene delivery systems based on polyplexes of nucleic acids with various cationic polymers. Natural polysaccharide derivatives are promising carriers due to their low toxicity. In this work, chitosan was chemically modified by a reaction with 4-formyl-n,n,n-trimethylanilinium iodide and pyridoxal hydrochloride and subsequent reduction of the imine bond with NaBH4. This reaction yielded three novel derivatives, n-[4-(n’,n’,n’-trimethylammonium)benzyl]chitosan chloride (TMAB-CS), n-[(3-hydroxy-5-(hydroxymethyl)-2-methyl-4-pyr

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Lopez de Armentia, Sara, Juana Abenojar, Yolanda Ballesteros, Juan Carlos del Real, Nicholas Dunne, and Eva Paz. "Polymerization Kinetics of Acrylic Photopolymer Loaded with Graphene-Based Nanomaterials for Additive Manufacturing." Nanomaterials 12, no. 24 (2022): 4498. http://dx.doi.org/10.3390/nano12244498.

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Graphene-based nanomaterials (GBN) can provide attractive properties to photocurable resins used in 3D printing technologies such as improved mechanical properties, electrical and thermal conductivity, and biological capabilities. However, the presence of GBN can affect the printing process (e.g., polymerization, dimensional stability, or accuracy), as well as compromising the quality of structures. In this study an acrylic photocurable resin was reinforced with GBN, using methyl methacrylate (MMA) to favor homogenous dispersion of the nanomaterials. The objective was to investigate the influe

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XU, SHIHONG, FAPEI ZHANG, ERDONG LU, et al. "PHOTOEMISSION STUDY OF THE GADOLINIUM/GaAs(100) INTERFACE WITH SYNCHROTRON RADIATION." Surface Review and Letters 04, no. 01 (1997): 25–31. http://dx.doi.org/10.1142/s0218625x97000055.

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Soft-X-ray photoemission spectroscopy was used to characterize the Gd/GaAs(100)-interface formation at room temperature. At low Gd coverage (<1 Å), the interface is near-abrupt, because no evidence of reaction is observed. With increasing Gd coverage, photoemission signals from chemically reacted product at the interface are observed, causing some intermixing between the overlayer and the substrate. For As atoms, they remain near the interface and have little diffusion. Ga atoms, however, are not kept near the interface, and they can diffuse into the Gd overlayer and segregate onto the surf

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Sulaeman, Uyi, Bin Liu, Shu Yin, and Tsugio Sato. "Synthesis of Ag3PO4 using Hydrophylic Polymer and Their Photocatalytic Activities under Visible Light Irradiation." Bulletin of Chemical Reaction Engineering & Catalysis 12, no. 2 (2017): 206. http://dx.doi.org/10.9767/bcrec.12.2.767.206-211.

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The highly active Ag3PO4 photocatalysts were successfully synthesized using the hydrophylic polymer of PVA (polyvinyl alcohol), PEG (polyethylene glycol) and PVP (polyvinyl pyrrolidone). The products were characterized using X-ray diffraction (XRD), Diffuse reflection spectroscopy (DRS), Field emission scanning electron microscope (FE-SEM), Brunauer–Emmett–Teller (BET) specific surface area, and X-ray photoelectron spectroscopy (XPS). Photocatalytic activities were evaluated using decomposition of Rhodamine B (RhB) under visible light irradiation. The results showed that the PVA, PEG, and PVP

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Gredel, R., E. F. Van Dishoeck, and J. H. Black. "Abundance of CH+ in Translucent Molecular Clouds: Problems for Shock Models?" Symposium - International Astronomical Union 150 (1992): 153–54. http://dx.doi.org/10.1017/s0074180900089890.

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The large abundance of CH+ in diffuse clouds has been a mystery for more than 50 years (Dalgarno 1976). Many different explanations have been proposed, but only (shock) models with a substantial column of warm gas appear capable of approaching the observed column densities (Elitzur and Watson 1978). In these models, CH+ is formed in the warm postshock gas through the reaction C+ + H2 → CH+ + H, which is endoergic by 4650 K. Although the most sophisticated MHD shock models are consistent with various observational aspects of CH+, they require substantial “fine-tuning” of the parameters (Draine

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Gunache (Roșca), Ramona Oana, and Constantin Apetrei. "Determination of Diosmin in Pharmaceutical Products with Chemically Modified Voltammetric Sensors." International Journal of Molecular Sciences 22, no. 14 (2021): 7315. http://dx.doi.org/10.3390/ijms22147315.

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In this paper, the electrochemical behavior of two types of sensors based on modified screen-printed electrodes (one screen-printed electrode based on carbon (SPCE) and another screen-printed electrode modified with Prussian Blue (PB/SPCE)) was studied with the aim of sensitive detection of diosmin, an active pharmaceutical compound from the class of flavonoids. The scan electron microscopy technique was used for the morphological characterization of PB/SPCE. The preliminary analysis assessed the electrochemical behavior of SPCE and PB/SPCE in KCl solution and in a double solution of potassium

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Graves, David B., and Richard A. Gottscho. "Computer Applications in Plasma Materials Processing." MRS Bulletin 16, no. 2 (1991): 16–22. http://dx.doi.org/10.1557/s0883769400057602.

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In manufacturing microelectronic and optoelectronic devices, thin solid films of various sorts are routinely deposited and etched using low pressure, weakly ionized plasmas. The term “plasma” in this context implies an ionized gas with nearly equal numbers of positive and negative charges. This definition is not very restrictive, so. there are an enormous number of phenomena that are termed plasmas. For example, very hot, magnetized, fully ionized plasmas exist in stellar environments and thermonuclear fusion experiments. High temperature electric arcs are a form of plasma as well. In contrast

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