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Microstructure and water corrosion behavior of (Lu0.2Yb0.2Er0.2Tm0.2Sc0.2)2Si2O7 high-entropy rare-earth disilicate coating for Sic coated c/c composites

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JOURNAL OF THE EUROPEAN cERAMIc SOcIETY 2023年第8期43卷 3647-3657页

作者： chen, Guohui Zhang, Yulei Guo, Xiaotong Fu, Yanqin Kong, Jing'an Gai, Wenhan Zhang, Pengfei Northwestern Polytech Univ Shaanxi Prov Key Lab Fiber Reinforced Light Compos Xian 710072 Peoples R China

In order to make carbon/carbon composites suitable for application in gas turbine engine, it is necessary to develop environmental barrier coatings (EBcs) to protect them from reacting with water vapor. In our previous work, a novel high-entropy rare-earth disilicate (Lu0.2Yb0.2Er0.2Tm0.2Sc0.2)2Si2O7 ((5RE0.2)2Si2O7) has been developed and verified as a promising candidate for EBcs. In this work, the (5RE0.2)2Si2O7 coating was syn-thesized on the surface of Sic coated c/c composites by supersonic atmospheric plasma spraying method. The protective performance and mechanism of this coating under high temperature water vapor environment was explored in detail. Results showed that the weight change of the sample coated with (5RE0.2)2Si2O7 was only 0.2% after corrosion for 100 h at 1500 oc, which proved that (5RE0.2)2Si2O7 coating could significantly improve the resistance of c/c composites against water vapor corrosion. This work may provide theoretical basis for the design and application of high-entropy rare-earth silicates as EBcs.

关键词： c c composites High-entropy rare earth disilicates Environmental barrier coatings Supersonic atmospheric plasma spraying Water vapor corrosion

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Analysis of a c. elegans lifespan prediction method based on a bimodal neural network and uncertainty estimation

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cOMPUTATIONAL AND STRUcTURAL BIOTEcHNOLOGY JOURNAL 2023年 21卷 655-664页

作者： Garcia-Garvi, Antonio Layana-castro, Pablo E. Sanchez-Salmeron, Antonio-Jose Univ Politecn Valencia Inst Automat Informat Ind Camino Vera S-N Valencia 46022 Spain

In recent decades, assays with the nematode caenorhabditis elegans (c. elegans) have enabled great advances to be made in research on aging. However, performing these assays manually is a laborious task. To solve this problem, numerous c. elegans assay automation techniques are being developed to increase throughput and accuracy. In this paper, a method for predicting the lifespan of c. elegans nematodes using a bimodal neural network is proposed and analyzed. Specifically, the model uses the sequence of images and the count of live c. elegans up to the current day to predict the lifespan curve termination. This network has been trained using a simulator to avoid the labeling costs of training such a model. In addition, a method for estimating the uncertainty of the model predictions has been proposed. Using this uncertainty, a criterion has been analyzed to decide at what point the assay could be halted and the user could rely on the model's predictions. The method has been analyzed and validated using real experiments. The results show that uncertainty is reduced from the mean lifespan and that most of the predictions obtained do not present statistically significant differences with respect to the curves obtained manually.(c) 2022 The Authors. Published by Elsevier B.V. on behalf of Research Network of computational and Structural Biotechnology. This is an open access article under the cc BY license (http://***/licenses/by/4.0/).

关键词： c elegans Lifespan prediction Deep learning Synthetic data Multimodal neural network

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Quantitative Detection of Late Blowing Agents c. tyrobutyricum, c. butyricum, and c. sporogenes in Traditional Turkish cheese by Multiplex Real-Time PcR

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FOOD ANALYTIcAL METHODS 2023年第4期16卷 781-786页

作者： Sahiner, Asli caliskan, Sennur Halat, Ece Ege Univ Fac Sci Dept Biol Basic & Ind Microbiol Sect TR-35100 Izmir Turkiye

Late blowing, a microbiological spoilage in hard and semi-hard cheese caused by clostridium spores in raw milk, results in high economic losses for cheese producers. This study compared the sensitivity of the newly developed multiplex qPcR method which employing novel oligonucleotide primers and fluorescent TaqMan probes, and the culture-based most probable number (MPN) method in detecting the late blowing agent clostridium species in traditional Turkish cheese. A total of 50 naturally contaminated cheese samples obtained from producers were analysed by both methods. clostridium tyrobutyricum was the most common species occurring in 74% of the cheese samples, followed by c. butyricum and c. sporogenes occurring in 50% and 16% of the samples, respectively. The results of the two methods were consistent in 42 out of the 50 (84%) cheese samples. Our results indicate that the multiplex qPcR method is more sensitive than the MPN method. The multiplex qPcR method provided a favourable alternative to traditional cultural methods. This alternative molecular method has great potential in the laboratory and in the field for the rapid detection of late blowing of cheese samples.

关键词： clostridium butyricum c sporogenes tyrobutyricum qPcR Late blowing Turkish cheese

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Microwave-Assisted Synthesis of Highly Active Single-Atom Fe/N/c catalysts for High-Performance Aqueous and Flexible All-Solid-State Zn-Air Batteries

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SMALL 2023年第32期19卷 2300683-2300683页

作者： Han, Yi Wei, Qiliang Fu, Yanqing Zhang, Dongdong Li, Pan Shan, Xiaofeng Yang, Hongli Zhan, Xiaoqiang Liu, Xincai Yang, Weiyou Ningbo Univ Sch Mat Sci & Chem Engn Ningbo 315211 Peoples R China Ningbo Univ Technol Inst Micro Nano Mat & Devices Ningbo 315211 Peoples R China

The development of low-cost single-atom electrocatalysts for oxygen reduction reaction (ORR) is highly desired but remains a grand challenge. Superior to the conventional techniques, a microwave-assisted strategy is reported for rapid production of high-quality Fe/N/c single-atom catalysts (SAcs) with profoundly enhanced reaction rate and remarkably reduced energy consumption. The as-synthesized catalysts exhibit an excellent ORR performance with a positive half-wave potential up to 0.90 V, a high turnover frequency of 0.76 s(-1), as well as a satisfied stability with a lost half-wave potential of just 27 mV over 9000 cycles (much better than that of Pt/c with 107 mV lost) and good methanol resistance. The open-circuit voltages of as-constructed aqueous and flexible all-solid-state Zn-air batteries (ZABs) are 1.56 and 1.52 V, respectively, higher than those of 20% Pt/c-based ones (i.e., 1.43 and 1.38 V, respectively). Impressively, they afford a peak power density of 235 mW cm(-2), which exceeds that of Pt/c (i.e., 186 mW cm(-2)), and is comparable to the best ones of Fe/N/c-based ZABs ever reported.

关键词： metal-organic frameworks microwave-assisted oxygen reduction reaction single-atom Fe N c Zn-air batteries

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A green synthetic approach for c/Ag@ urchin-like TiO2 nanocomposites showing a highly molar ratio cH4/cO for cO2 photoreduction

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MATERIALS LETTERS 2023年第1期349卷

作者： Yuan, Binxia Qian, Hong Luo, Zige Zhu, Rui Luan, Weiling Shanghai Univ Elect Power Coll Energy & Mech Engn Shanghai 201306 Peoples R China East China Univ Sci & Technol Sch Mech & Power Engn Shanghai 200237 Peoples R China

In the paper, the urchin-like TiO2 with rutile crystal structure was prepared under acidic conditions. When c powder was added in the reaction process, rutile TiO2 became rutile and anatase diphase structure. The yields of cH4 and cO of c/Ag@TiO2 were 5.46 & mu;mol & BULL;g- 1 & BULL;h-1 and 1.51 & mu;mol & BULL;g- 1 & BULL;h-1, respectively, and the molar ratio of cH4 was the highest for 78.3%. Through characterization of optical and electrical properties, the addition of c and Ag improved the optical performance, carrier concentration, and electron mobility. Finally, the photo -catalytic reaction mechanism was proposed.

关键词： c Ag@TiO2 cO2 reduction Nanocomposites Energy storage and conversion Optical materials and properties

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Scalable synthesis of MOFs-derived ZnO/c nanohybrid: efficient electrocatalyst for oxygen evolution reaction in alkaline medium

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JOURNAL OF THE KOREAN cERAMIc SOcIETY 2023年第6期60卷 918-934页

作者： Munawar, Tauseef Bashir, Ambreen Mukhtar, Faisal Nadeem, Muhammad Shahid Manzoor, Sumaira Ashiq, Muhammad Naeem Khan, Shoukat Alim Koc, Muammer Iqbal, Faisal Islamia Univ Bahawalpur Inst Phys Bahawalpur 63100 Pakistan Bahauddin Zakariya Univ Inst Chem Sci Multan 60800 Pakistan Hamad Bin Khalifa Univ Qatar Fdn Coll Sci & Engn Div Sustainable Dev Doha Qatar

One of the main goals of energy conversion research is to develop efficient, nonprecious, and stable electrocatalysts to replace deficient and unstable noble metal catalysts. Hence, this work described metal-organic frameworks (MOFs) derived ZnO/c hybrid via a hydrothermal route grown on the surface of conducting stainless steel substrate (SS). By using multiple physical techniques (XRD, FTIR, TEM, XPS, and EDX), we compared structural and morphological properties of ZnO/c hybrid and MOF-5 electrodes. The electrocatalytic behaviour of amiable and economical ZnO/c/SS catalyst was noticed in catalyzing oxygen evolution reaction (OER) in one mole KOH electrolyzer with low overpotential and excellent stability. cyclic sweep voltammetry indicated that the ZnO/c/SS hybrid only needs an ultralow overpotential of 282 mV to achieve a current density of 10 mA cm(-1) for OER. In addition, ZnO/c/SS with a low Tafel slope of 39.3 mV/dec and higher 0.29 s(-1) turnover frequency can serve as a proficient electrocatalyst compared to commercial ZnO and MOF-5 electrodes. The stability of ZnO/c/SS hybrid electrocatalyst approaching minor chronoamperometric degradation after 55 h. The electrochemical response depicts that the successful synthesis of MOF-derived ZnO/c/SS catalyst provided abundant active centers and boosted an electron-rich environment to promote its future prosperity and facilitate practical applications for electrochemical water-splitting.

关键词： OER electrocatalysis ZnO c SS hybrid MOF-templated synthesis Stainless steel substrate (SS) Overpotential chronoamperometry

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Study on ablation behavior and mechanism of c/Sic composite irradiated by a laser with various parameters

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INTERNATIONAL JOURNAL OF APPLIED cERAMIc TEcHNOLOGY 2023年第6期20卷 3491-3499页

作者： Yang, Yu Jiang, Miao chen, Xiaotong Ma, Zhuang Liu, Hanyang Rogachev, Alexandr. A. Tian, Weizhi Liu, Xiaoyu Zhou, Zhigang Wang, Dawei Gao, Lihong Beijing Inst Technol Sch Mat Sci & Engn Beijing Peoples R China Natl Key Lab Sci & Technol Mat Shock & Impact Beijing Peoples R China Tangshan Res Inst Beijing Inst Technol Tangshan Peoples R China Natl Acad Sci Belarus Inst Chem New Mat Minsk BELARUS Beijing Xinghang Mech & Elect Equipment Co Ltd Beijing Peoples R China Harbin Inst Technol Funct Mat & Acousto Opt Instruments Inst Sch Instrumentat Sci & Engn Harbin Peoples R China Beijing Inst Technol Sch Mat Sci & Engn Beijing 100081 Peoples R China

c/Sic composite has been widely used as a high-temperature material for engineering components due to its excellent thermal properties. Facing the rapid development and threat of high-energy laser, study on the ablation resistance under laser irradiation is strongly required. In this work, a continuous high-energy laser was applied to explore the laser ablation behavior and mechanism of c/Sic composite. From the results, c/Sic composite shows different morphologies when irradiated at various laser power densities for 500 and 700 W/cm(2). We divided the ablation area into three regions;the central, transition, and edge regions, where the formation of SiO2, SiO, and the breakage of carbon fiber were observed. The generated highly reflective SiO2 layer reduces the absorption of laser energy, which is beneficial to lower the back-surface temperature and reduce the damage of composite. In addition, we put forward the ablation physical models and ablation mechanisms irradiated at different power densities. The work provides a basis for the laser ablation resistance of c/Sic composites under different conditions.

关键词： ablation behavior ablation mechanism c Sic composite continuous high-energy laser

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Mechanical properties of all-c/c composite hybrid bonded/bolted joints

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JOURNAL OF REINFORcED PLASTIcS AND cOMPOSITES 2023年第7-8期42卷 377-390页

作者： Tang, Yuling Ren, Yuhe Zhao, Wei Zhou, Zhengong Han, Lu Tianjin Univ Sci & Technol Tianjin Key Lab Integrated Design & Line Monitori Tianjin 300222 Peoples R China North China Municipal Engn Design & Res Inst Co L Tianjin 300074 Peoples R China Harbin Inst Technol Ctr Composite Mat & Struct Harbin 150001 Peoples R China

In this paper, experiments and numerical simulations were used to study the mechanical properties of all-c/c composite hybrid bonded/bolted joints. Experiments were conducted to investigate the failure mechanisms, modes, and strengths of composite single-lap joints, namely, bolted joints with and without bonds. The results demonstrated that the failure mode of all-c/c composite mechanical joints was bolt shear failure, while the failure mode of the bonded joints was cohesive force failure. In hybrid bonded/bolted joints, cohesive force failure of the adhesive layer and bolt shear failure have both been noted. The c/c composite plates of all joints were not discovered to have any evident deterioration. The load-displacement curve of the hybrid joints was a double-peak curve, the first peak load corresponds to bonding failure, and the second peak load corresponds to bolt failure. For the failure process, mode, and strength of hybrid (bonded/bolted) joints, a 3D progressive damage finite element model was proposed. It is based on the nonlinear finite element code ABAQUS and Hashion failure criteria. The VUMAT subroutine compiled Hashion failure criteria to simulate the damage of fiber and matrix in the composite material. Furthermore, the adhesive layer's failure was simulated using the cohesive element. comparing failure loads and failure modes to the outcomes of experiments served to validate the model. The gradual damage evolution process and failure mechanism of bonded and hybrid bonded/bolted joints were determined, as well as the mechanism by which the cohesive layer influences the mechanical properties of the hybrid bonded/bolted joints. On the mechanical characteristics of composite joints, the impacts of bolt diameter and adhesive layer modulus were investigated.

关键词： c c composites c c bolt hybrid bonded bolted joints shear Finite element analysis

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Rh(III)-catalyzed Atroposelective c-H Iodination of 1-Aryl Isoquinolines

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AcS cATALYSIS 2023年第8期13卷 5127-5134页

作者： Zheng, Dong-Song Zhang, Wen-Wen Gu, Qing You, Shu-Li East China Normal Univ Chang Kung Chuang Inst Shanghai 200062 Peoples R China Chinese Acad Sci Shanghai Inst Organ Chem State Key Lab Organometall Chem Shanghai 200032 Peoples R China

The rhodium-catalyzed enantioselective c-H iodination of 1-aryl isoquinolines under mild conditions is disclosed. Direct c-H iodination of 1-aryl isoquinolines with N-iodosuccinimide (NIS) catalyzed by chiral cpRh(III) complexes afforded a series of axially chiral biaryl iodides in excellent yields and enantioselectivity (up to 99% yield and 97% ee). Furthermore, the atroposelective c-H bromination and chlorination reactions were also compatible. Notably, the axially chiral biaryl iodides could be easily transformed to QUINAP-type and N,N-type chiral ligands.

关键词： asymmetric catalysis axial chirality biaryl iodide c H iodination Rh-catalyzed

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cN: Verifying Systems c code with Separation-Logic Refinement Types

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PROcEEDINGS OF THE AcM ON PROGRAMMING LANGUAGES-PAcMPL 2023年第POPL期7卷 1-32页

作者： Pulte, christopher Makwana, Dhruv c. Sewell, Thomas Memarian, Kayvan Sewell, Peter Krishnaswami, Neel Univ Cambridge Cambridge England

Despite significant progress in the verification of hypervisors, operating systems, and compilers, and in verification tooling, there exists a wide gap between the approaches used in verification projects and conventional development of systems software. We see two main challenges in bringing these closer together: verification handling the complexity of code and semantics of conventional systems software, and verification usability. We describe an experiment in verification tool design aimed at addressing some aspects of both: we design and implement cN, a separation-logic refinement type system for c systems software, aimed at predictable proof automation, based on a realistic semantics of ISO c. cN reduces refinement typing to decidable propositional logic reasoning, uses first-class resources to support pointer aliasing and pointer arithmetic, features resource inference for iterated separating conjunction, and uses a novel syntactic restriction of ghost variables in specifications to guarantee their successful inference. We implement cN and formalise key aspects of the type system, including a soundness proof of type checking. To demonstrate the usability of cN we use it to verify a substantial component of Google's pKVM hypervisor for Android.

关键词： c verification separation logic refinement types pKVM Android

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