bluuebunny/crossref_metadata_2025_split huggingface dataset:
Preparation and Mechanical Properties Analysis of Rare Earth Filling Ethylene‐Allene Monomer Rubber Composite
Authors: Wu Jianyu , Liu Jianjun , Qi Jianlei , Zhang Yinmin , Dong Lei , Wang Yanping 
Published: October 2024

AbstractEthylene propylene diene monomer (EPDM) rubber is used in critical sectors such as national defense, military, and aerospace. However, it has performance limitations under high temperatures, affecting its dynamic mechanical properties, creep, and stress relaxation. To overcome these limitations, rare earth cerium oxide (CeO2) was incorporated as a filler into EPDM in this study, which enhances its properties and makes it suitable for the demanding applications. It could be seen that the CeO2‐enriched EPDM has significantly improved mechanical characteristics at elevated temperatures. The Young's modulus of CeO2‐enriched EPDM increased by about 100 %, while the energy storage modulus reaches a maximum increase of around 140 % at 165 °C. The addition of CeO2 improves its damping properties, provides better creep and stress relaxation resistance, and results in greater residual strain recovery. At room temperature, the impact on the stress relaxation rate at 50 % strain is minimal for the material EPDM, and it is almost negligible for the material EPDM/CeO2.These findings demonstrate that CeO2‐enriched EPDM has enhanced performance under high‐temperature conditions. Under elevated temperature conditions, EPDM enriched with CeO2 exhibits enhanced mechanical properties, superior creep resistance, and stable stress relaxation behavior, rendering it more adept at withstanding the rigorous conditions encountered in aerospace applications.
Tandem Oxidative Reaction for the Synthesis of 1,6‐Naphthyridones
Authors: Cheng Dongping , Wang Yawei , Guo Chengzhi , Xu Xiaoliang 
Published: October 2024

AbstractA tandem oxidative reaction of pyridinones and 1,3‐diarylpropenes is disclosed. The reaction undergoes oxidative coupling mediated by 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone (DDQ), and subsequent intramolecular cyclization and dehydro‐aromatization catalyzed by Cu(OTf)2/bis(tert‐butyl)peroxide (DTBP). A series of 1,6‐naphthyridones are obtained in moderate to excellent yields.
Chiral Organic Salt Supported Pd Nanoparticles as Selective Heterogeneous Catalysts of Hydrogenation Reactions
Authors: Kuznetsova Svetlana A. , Yunusov Safar M. , North Michael , Zhereb Vladimir P. , Khakina Ekaterina A. , Naumkin Alexander , Lobanov Nikolai N. , Khrustalev Victor N. , Chusov Denis , Kalyuzhnaya Elena S. , Ilyin Mikhail M. , Morozov Viacheslav V. , Kashin Alexey S. , Ezernitskaya Mariam G. , Belokon Yuri N. 
Published: October 2024

AbstractIn this study, we report the synthesis of a new type of chiral crystalline organic porous salt CF2 derived from the ionic reaction between tetrakis(4‐sulfophenyl)methane (TSPM) and the tetra‐(S)‐prolylamide of tetrakis(4‐aminophenyl)methane, (S)‐TPPM, and its ability to stabilize 2 nm palladium nanoparticles to give a novel, nonpyrophoric, chiral, catalytic material Pd@CF2. The preparation of the catalyst was very simple and conducted in water. The heterogeneous catalytic performance of Pd@CF2 was tested in hydrogen reductions of olefins and substituted nitroaromatic compounds using Pd/C as a comparison to determine the specific features of the novel catalyst. Although both types of catalysts exhibited similar catalytic activity in case of reductions of diphenylacetylene and nitrobenzene, Pd@CF2 predominantly promoted the reduction of p‐nitrobenzaldehyde to p‐aminobenzyl alcohol whereas Pd/C gave p‐toluidine. The reduction of p‐dinitrobenzene led to predominant formation of p‐nitrophenylhydroxylamine if promoted by the novel catalyst and to a mixture of products if promoted by Pd/C. In addition, the introduction of p‐alkoxy groups onto nitrobenzenes slowed down the reduction with Pd@CF2 but had no influence on Pd/C activity. A hypothesis ascribing these observations to dissimilar equilibrium distributions of nitro and polar groups within the organic framework and the palladium metal surface is proposed to rationalize the selectivity of the novel catalytic material.
Regeneration of a Fire‐Resistant Fluid‐Fouled Strong Base Anion Resin using a Caustic Solution with Citric Acid as a Surfactant
Authors: Seth Dipravath Kumar , Datta Sayanti 
Published: October 2024

AbstractFire Resistant Fluid (FRF), used in turbine governing systems, transforms during operation, forming substituted phenol and phosphoric acid. The use of strong Base Anion Resin (SBA resin) to reduce the Total Acid Number (TAN) of FRF is widespread. However, the regeneration of these oil‐fouled resins is crucial due to their high cost and the challenges associated with their environmental disposal. In this study, we present a novel method for recovering exhausted resin by treating it with an aqueous solution of citric acid, followed by regeneration with a caustic soda solution. We optimized the recovery percentage in the ion exchange capacity by testing varying concentrations of the citric acid solution under different reaction conditions. The highest recovery of ion exchange capacity achieved was 55 % after soaking for 16 hours in a 5 % citric acid solution, followed by regeneration with a 5 % NaOH solution. The efficacy of citric acid in this research was further explored through a Density Functional Theory (DFT) study. This study is significant as it is the first to demonstrate the successful regeneration of oil‐fouled resins with high ion exchange capacity using citric acid, a more environmentally friendly and cost‐effective alternative.
Design and Synthesis of Ester Linked 1,2,3‐Triazole Quinoline Derivatives with Pancreatic β Cells Protective Activity against Oxidative Stress and Endoplasmic Reticulum Stress for Better Management of Type II Diabetes Mellitus
Authors: Kulkarni Netra D. , Chavan Abhijit , Mhaske Pravin , Modak Manisha 
Published: October 2024

AbstractUnresolved endoplasmic reticulum (ER) stress and oxidative stress lead to the pathogenesis of type II diabetes mellitus (DM). Connecting links between the ER stress and oxidative stress pathways might play an important role in treatment and pathogenesis of diabetes. Here, we used network pharmacology approach to find the target proteins linking the ER stress and oxidative stress pathways. CHOP emerged as a hub protein from our results and was targeted by 16 newly designed and synthesized ester linked 1,2,3‐triazole quinoline derivatives by molecular docking. Drug likeliness prediction studies revealed all compounds as good druggable candidates. Compounds 5b (R = H, R1 = F), 5j (R = CH3, R1 = F), 5m (R = OCH3, R1 = H), and 5n (R = OCH3, R1 = F) were found to have considerable binding energies and active site amino acid interactions with CHOP. We further showed that compounds 5b, 5m, and 5n exhibited low toxicity with more than 50% cell survival and low IC50 values. These were therefore subjected to evaluate their effects on ER stress and oxidative stress. Finally, compound 5n (R = OCH3, R1 = F) was found to alleviate ER stress and is also a good antioxidant. Identification of such targets and compounds effective in improving ER stress and oxidative stress may provide new insights in the development of therapies and management of T2DM.
A Concise Formal Total Synthesis of (±)‐Laurokamurene B and (±)‐β‐Cuparenone
Authors: Srivastava Amit Kumar , Ravikumar Muttineni , Babu Reddigunta Ramesh 
Published: October 2024

AbstractThe study describes a concise four‐step formal total synthesis of racemic (±)‐laurokamurene B, a sesquiterpene with a rearranged laurene carbon framework. This method also extends to the formal total synthesis of β‐cuparenone. Compared with previously reported laurokamurene B's syntheses, our approach significantly reduces the total number of reaction steps by leveraging the known scaffolds as the key concept. Optimized esterification for the generation of appropriately substituted cinnamate esters, one‐pot polyphosphoric acid (PPA) mediated fragmentation followed by Friedel–Crafts acylation, and intramolecular cyclization led to the efficient construction of pivotal intermediate 3‐arylcyclopent‐2‐en‐1‐one with a quaternary center; subsequent α‐methylation and reductive deoxygenation resulted into the marine natural product (±)‐laurokamurene B. Additionally, β‐methylation and deoxygenation of the obtained key 3‐arylcyclopente‐2‐en‐1‐one intermediate could also serve for the formal total synthesis of (±)‐β‐cuparenone in the shortest approach.
Effect of Al and Zn on Oxygen Evolution Reaction of (FeCoNiMnCu)3O3.2
Authors: Zhang Qi , You Junhua , Zhao Yao , Yi Baolin , Ren Yinglei 
Published: October 2024

AbstractBecause of its low cost and abundant sources, hydrogen serves as a clean energy alternative capable of successfully substituting fossil fuels. A highly efficient method for generating hydrogen energy currently is by the electrolysis of water. The oxygen‐extraction reaction (OER), a component of water electrolysis, requires a complex chemical pathway that involves multiproton and multielectron interactions. To enhance reaction efficiency in the OER process, catalysts are crucial; thus, the search for high‐performance, cost‐effective catalysts is underway. This experimental study involved the enhancement of the five‐membered high‐entropy oxide (FeCoNiMnCu)3O3.2 by incorporating a sixth group element (Zn, Al). The organization, morphology, and OER properties were analyzed following the preparation utilizing a mechanical ball milling process. A series of rock salt‐type hexagonal high entropy oxides with differing ball milling durations were synthesized to investigate the influence of the production method on the surface shape and catalytic properties of high entropy oxides. The results indicated that the single‐phase rock salt structure of (FeCoNiMnCuAl)3O3.5, a high‐entropy oxide, exhibited significantly altered diffraction peaks, hence improving OER performance. Optimization of the preparation technique revealed that a 72‐h ball milling duration resulted in an overpotential of merely 293 mV and an electrochemically active surface area approximately double that of the other milling durations.
Hydrogen‐Bonded Organic Frameworks as a Carrier for Nanodrugs with Host–Guest Interaction for Smart Wound Dressing Applications
Authors: Moeinipour Alieh , Afkhami Abbas , Madrakian Tayyebeh 
Published: October 2024

AbstractThis study introduces surface modification to conventional dressings utilizing adducts of a hydrogen‐bonded organic framework (HOF) with curcumin, curcumin–silver, curcumin‐zinc oxide nanoparticles, and citric acid drugs. Accordingly, eight HOF‐AMs and dressings modified with them were studied. The synthesized structures underwent characterization using various methods, including IR, 1H NMR, XRD, FE‐SEM, and EDX. FE‐SEM results show that the hexagonal morphology is maintained along with the crystal growth in the form of hexagonal tubes. In order to confirm the nanoscale nature of the structures, TEM analysis was conducted specifically for curcumin‐Ag nanoparticles and curcumin–ZnO nanoparticles which confirms the particle size smaller than 50 nm. Knowing the sensitivity of the release of the incorporated substances to temperature and pH, the controlled release of the drugs at two different temperatures (37 °C and 40 °C) and pH levels of 5.5, 7.4, and 9 at the modified dressings was investigated. Investigating the release of HOF‐AMs particles and modified dressings indicates that these products in both cases provide the possibility of drug release in alkaline and acidic pHs. Also, the results showed that increasing the temperature increases the release of curcumin particles in all its types. The modified dressings showed a loading capacity of more than 50 mg g−1.
Iodine‐DMSO Catalyzed β‐carboline Derivative Chemoselective Fluorescent Molecule for Detection of Fluoride and Cyanide Anion
Authors: Gosavi Nilesh M. , Zalmi Geeta A. , Gaikwad Sunil V. , A L Shaikh Salman , Gaikwad Milind. V. , Nikam Latesh K. , Bhosale Sheshanath V 
Published: October 2024

AbstractIn this work, a simple and highly sensitive fluorescent receptor 1‐(p‐tolyl)‐4,9‐dihydro‐3H‐pyrido[3,4‐b]indole (receptor 1), has been synthesized for the detection of fluoride and cyanide ions. The receptor 1 was very selective towards fluoride and cyanide anions over other anions such as Cl−, Br−, I−, HSO4−, NO3−, HPO42−, and OAc−. Synthesized receptor 1 shows low detection limits 3.29 × 10−8 M for fluoride ion, which was determined by UV–vis absorption. While LOD for cyanide was observed to be 61.5 nM. Importantly, while, receptor 1 produced binding constant for fluoride and cyanide in DMSO‐H2O (1:9, v/v) was found to be 5 × 10−4M−1 and 3.28 × 10−5 M−1, respectively. The variation in the optical and fluorescence spectroscopy confirms the formation of N─H⋯F− and N─H⋯CN− hydrogen bond of the pyrrolic proton The sensing mechanism displayed by receptor 1 for fluoride and cyanide ions was confirmed by 1H‐NMR and FT‐IR spectroscopic along with density functional theory (DFT) calculations. Solution with the fluoride and cyanide ions in DMSO‐H2O (1:9, v/v) shows a color change from light yellow to blue under UV light and yellow to colorless in visible light.
Advancements in cobalt‐based oxide catalysts for soot oxidation: Enhancing catalytic performance through modification and morphology control
Authors: Zhao Tingyi , Song Zuguo , Wu Chengchun , Li Yuanjun , Li Haoze , Wei Yuechang , Yao Siyu , Xiao Menglan , Zhao Mingqin , Cui Bing 
Published: October 2024

AbstractThe widespread use of diesel engines results in significant environmental contamination due to emitted pollutants, particularly soot particles. These pollutants are detrimental to public health. At present, one of the most effective ways to remove soot particles is the catalytic diesel particulate filter after‐treatment technology, which requires the catalyst to have superior low temperature activity. Compared with cerium oxide which is widely used, cobalt oxide in transition metal oxides has been widely studied in recent years because of its high redox ability and easy to control morphology. This paper elaborates on the influence of modification techniques such as doping, loading, and solid solution on the catalytic performance of cobalt‐based catalysts in soot oxidation. Along the same lines, it further reviews the research progress on cobalt‐based oxide catalysts with specific dimensional structures and morphologies in soot oxidation. Finally, it provides an outlook on the challenges faced by the theoretical basis and applied research of cobalt‐based catalysts in soot oxidation.
Inside Ceramics and Between MgO Grains: Solid‐State Synthesis of Intergranular Semiconducting or Magnetic Spinels
Authors: Schwab Thomas , Aicher Korbinian , Zickler Gregor A. , Reissner Michael , Diwald Oliver 
Published: October 2024

AbstractConfigurations of composite metal oxide nanoparticles are typically far off their thermodynamic equilibrium state. As such they represent a versatile but so far overlooked source material for the intergranular solid‐state chemistry inside ceramics. Here, it is demonstrated how the admixture of Fe3+ and In3+ ions to MgO nanoparticles, as achieved by flame spray pyrolysis, can be used to engage ion exsolution, phase separation, and subsequent spinel formation inside the network of diamagnetic and insulating MgO grains. Extremely high uniformity in the distribution of intergranular ferrimagnetic MgFe2O4 films and grains with resulting magnetic coercivity values that depend on the nanoparticles’ initial Fe3+ concentration is achieved. Moreover, percolating networks of semiconducting MgIn2O4 are derived from MgO nanoparticles with admixtures of 20 at% In3+ that gives rise to an enhancement of dc conductivity values by more than five orders of magnitude in comparison to the insulating MgO host. The here presented approach is general and applicable to the synthesis of a variety of functional spinel nanostructures embedded inside ceramic matrices. Nanoparticle loading with aliovalent impurity ions, the level of nanoparticle powder density after compaction, and sintering temperature are key parameters for this novel type of solid‐state chemistry in between the host grains.
Epitaxial Thin Film Growth on Recycled SrTiO3 Substrates Toward Sustainable Processing of Complex Oxides
Authors: Shen Jianan , Quigley Lizabeth , Barnard James P. , Lu Ping , Tsai Benson Kunhung , Zemlyanov Dmitry , Zhang Yizhi , Sheng Xuanyu , Gan Jeremy , Moceri Matteo , Hu Zedong , Huang Jialong , Shen Chao , Deitz Julia , Zhang Xinghang , Wang Haiyan 
Published: October 2024

AbstractComplex oxide thin films cover a range of physical properties and multifunctionalities that are critical for logic, memory, and optical devices. Typically, the high‐quality epitaxial growth of these complex oxide thin films requires single crystalline oxide substrates such as SrTiO3 (STO), MgO, LaAlO3, a‐Al2O3, and many others. Recent successes in transferring these complex oxides as free‐standing films not only offer great opportunities in integrating complex oxides on other devices, but also present enormous opportunities in recycling the deposited substrates after transfer for cost‐effective and sustainable processing of complex oxide thin films. In this work, the surface modification effects introduced on the recycled STO are investigated, and their impacts on the microstructure and properties of subsequently grown epitaxial oxide thin films are assessed and compared with those grown on the pristine substrates. Detailed analyses using high‐resolution scanning transmission electron microscopy and geometric phase analysis demonstrate distinct strain states on the surfaces of the recycled STO versus the pristine substrates, suggesting a pre‐strain state in the recycled STO substrates due to the previous deposition layer. These findings offer opportunities in growing highly mismatched oxide films on the recycled STO substrates with enhanced physical properties. Specifically, yttrium iron garnet (Y3Fe5O12) films grown on recycled STO present different ferromagnetic responses compared to that on the pristine substrates, underscoring the effects of surface modification. The study demonstrates the feasibility of reuse and redeposition using recycled substrates. Via careful handling and preparation, high‐quality epitaxial thin films can be grown on recycled substrates with comparable or even better structural and physical properties toward sustainable process of complex oxide devices.
Further evidence on inflation targeting and income distribution
Authors: Thornton John , Vasilakis Chrysovalantis 
Published: October 2024

AbstractThis paper examines the effect of inflation targeting (IT) on income distribution in a panel of 70 countries. Employing panel regressions and a variety of propensity score matching methods, we find strong evidence that incomes became more unequal in IT‐adopting countries relative to countries that did not adopt IT. Panel regressions suggest that Gini coefficients increased by 0.25%–0.57% and the share of income of the top 1% and 10% of households increased by 0.7% in IT adopter countries. Using propensity score matching methods, IT has been associated with a relative rise in Gini coefficients of about 1–2 percentage points, and a relative increase in the share of national income going to the top 1% and 10% of households by about 11–13 percentage points and 13–17 percentage points, respectively. The results are robust to changes in country sample and alternative estimation methodologies.
Analysis of the Seismic Vulnerability of a Masonry Pagoda Based on Increasing Dynamic Analysis
Authors: Lu Junlong , Jia Xiaoyu , Li Mingdong , Wang Zhenshan , Tian Jianbo 
Published: October 2024

ABSTRACTFor the seismic vulnerability analysis method of masonry pagodas, the dynamic characteristic of the Bayun Pagoda in China was conducted by using environmental excitation technology. A numerical model of the masonry pagoda was established with the finite element software Abaqus. Ten seismic waves were selected as excitation signals to conduct incremental dynamic analysis (IDA) on the pagoda. The Sa(T1,5%) served as the seismic intensity indicator, whereas the damage factor (d) and relative stress () were employed as damage indicators for seismic vulnerability analysis of the pagoda. The failure probability of the structure reaching the limit state under different seismic intensities was determined. The results indicate that, comparing the IDA curves and seismic vulnerability curves under two different damage indicators, the Sa(T1,5%) range required for the IDA curves under the damage factor (d) is smaller than the relative stress (), with lower dispersion. Additionally, the failure probability of the pagoda reaching different limit states is higher under the damage factor (d). Considering the existing damage status of the masonry pagoda, the damage factor (d) is more reasonable as the damage indicator.
Toward a system of gesture–speech relations in elementary science teaching
Authors: Zhang Zhenzhen , Bowcher Wendy L. , Yang Bingjun 
Published: October 2024

AbstractAlthough previous research provides insights into how gestures function as a pedagogical tool, relatively little is known about how gesture is related to language, together creating a key meaning‐making teaching resource. Drawing on the system of logico–semantic relations in Systemic Functional Linguistic theory and McNeill's description of gestures, this study examines how gesture is logically and semantically related to the language teachers use in elementary science classrooms. The study is primarily qualitative in nature and uses video recordings as the primary data. The main purpose is to analyze the kind of gesture–speech relations used by elementary science teachers and to develop a system network that describes gesture–speech relations in elementary science teaching. Distribution of the gesture–speech relations shows that some relations are more likely used to teach scientific knowledge, some are more likely used for classroom management, and some are used for both.
Exploration of numerical simulation for unsteady Casson nanofluid thin film flow over stretching surface with mixed convection effects using Buongiorno's nanofluid model
Authors: Saleem Musharafa , Al‐Zubaidi A. , Tufail Muhammad Nazim , Fiaz Zainab , Saleem S. 
Published: October 2024

AbstractThis study focuses on investigating the effects of viscous dissipation, magnetohydrodynmaics (MHD) and mixed convection on Casson nanofluid thin film flow over a vertical stretching surface, considering its unsteady, two‐dimensional nature. The problem is formulated by assuming incompressible flow and employing boundary layer approximations, leading to a system of partial differential equations (PDEs). These PDEs are then transformed into nonlinear ordinary differential equations (ODEs) using similarity transformations. Numerical techniques, facilitated by computational software such as Mathematica, are employed to solve these nonlinear ODEs. The investigation probes into the mathematical analysis of various physical parameters, presenting their effects through graphical representations. The impact of parameters such as concentration Grashof number (Gc), thermal Grashof number (Gr), magnetic parameter (M), unsteadiness parameter (S), dimensionless film thickness (β), and Casson fluid parameter (γ) are examined. The velocity profile exhibits an increase with rising values of Gc and Gr, while it decreases with increasing values of M, S, β, and γ. The results are further elucidated through tabular representations, providing insights into the variations of skin‐friction coefficient, Sherwood number, and Nusselt number with respect to the aforementioned parameters.