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combinatorial method for direct measurements of the intrinsic hydrogen permeability of separation membrane materials

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JOURNAL OF MEMBRANE SCIENCE 2013年 444卷 70-76页

作者： de Man, S. Gonzalez-Silveira, M. Visser, D. Bakker, R. Schreuders, H. Baldi, A. Dam, B. Griessen, R. Vrije Univ Amsterdam Fac Sci Dept Phys NL-1081 HV Amsterdam Netherlands Leiden Univ Huygens Lab NL-2333 CA Leiden Netherlands Univ Autonoma Barcelona Dept Phys Nanomat & Microsyst Grp Bellaterra 08193 Spain Delft Univ Technol Fac Sci Appl MECS NL-2628 BL Delft Netherlands FOM Inst AMOLF NL-1098 XG Amsterdam Netherlands Stanford Univ Dept Mat Sci & Engn Stanford CA 94305 USA

By means of hydrogenography and an yttrium indicator layer we determine the intrinsic hydrogen permeability in hundreds of compositions of the PdyCu1-y alloy, under exactly the same experimental conditions of temperature and hydrogen pressure. The permeability values obtained with this technique are intrinsic in the sense that they are independent of surface reactions. The room temperature values of the permeability of PdyCu1-y with 0.3 < y < 0.7 exhibit a clear maximum near y = 0.47. The same technique is easily applicable to determine the intrinsic hydrogen permeability of the ternary or quaternary alloy systems. This is explicitly shown for the Pd-Cu-Mo ternary alloys. In this system addition of Mo always leads to a decrease of the intrinsic hydrogen permeability. A similar behavior is observed for Pd-Cu-Ta and Pd-Cu-Ti ternary alloys. (c) 2013 Elsevier B.V. All rights reserved.

关键词： Hydrogen purification Hydrogen permeability Hydrogen membrane combinatorial method Binary and ternary alloys

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Reliability analysis of body sensor networks with correlated isolation groups

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RELIABILITY ENGINEERING & SYSTEM SAFETY 2023年第1期236卷 109305页

作者： Zhao, Guilin Xing, Liudong Southwest Jiaotong Univ Sch Comp & Artificial Intelligence Chengdu Peoples R China Univ Massachusetts Elect & Comp Engn Dept Dartmouth MA 02747 USA Graphic Era Deemed Univ Dept Comp Sci & Engn Dehra Dun India

Body sensor networks (BSNs) are playing a crucial role in tackling arising challenges during the COVID-19 pandemic. This work contributes by modeling and analyzing the BSN reliability considering the effects of correlated functional dependence (FDEP) and random isolation time behavior. Particularly, the FDEP exists in BSNs where a relay is utilized to assist the communication between some biosensors and the sink device. When the relay malfunctions, the dependent biosensors may communicate directly with the sink for a limited, un-certain time. These biosensors then become isolated from the rest of the BSN when their remaining power de-pletes to the level insufficient to support the direct communication. Moreover, multiple biosensors sharing the same relay and a biosensor communicating with the sink via several alternative relays create correlations among different FDEP groups. In addition, the competition in the time domain exists between the local failure of the relay and the propagated failures of dependent biosensors. Both the correlation and competition complicate the reliability modeling and analysis of BSNs. This work proposes a combinatorial and analytical methodology to address both effects in the BSN reliability analysis. The proposed method is demonstrated using a detailed case study and verified using a continuous-time Markov chain method.

关键词： Body sensor network combinatorial method Correlation Random isolation time Reliability analysis

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combinatorial development of antibacterial FeCoCr-Ag medium entropy alloy

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Materials Futures 2023年第2期2卷 134-141页

Antibacterial activity and mechanical properties of FeCoCr-Ag medium entropy alloys were studied via combinatorial fabrication paired with high-throughput *** was found that the antibacterial activity and mechanical properties exhibit non-linear dependence on the content of Ag *** the studied alloys,(FeCoCr)_(80)Ag_(20) possesses an optimized combination of different properties for potential applications as antibacterial coating *** underlying mechanism is ascribed to the formation of a dual-phase structure that leads to competition between the role of Ag phase and FeCoCr phase at different Ag *** results not only demonstrate the power and effectiveness of combinatorial methods in multi-parameter optimization but also indicate the potential of high entropy alloys as antibacterial materials.

关键词： antibacterial metals and alloys medium entropy alloy combinatorial method

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Deconvolution for some singular density errors via a combinatorial median of means approach

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Mathematical Statistics and Learning 2023年第1-2期6卷 51-85页

作者： Marteau, Clément Sart, Mathieu Univ Lyon Université Claude Bernard Lyon 1 CNRS UMR 5208 Institut Camille Jordan Villeurbanne 69622 France Université Jean Monnet Saint-Étienne CNRS Institut Camille Jordan UMR 5208 Saint-Étienne 42023 France

We present a versatile and model based procedure for estimating a density in a deconvolution setting where the error density is assumed to be singular enough. We assess the quality of our estimator by establishing non-asymptotic risk bounds for the L¹ loss. We specify them when the density is piecewise constant on a finite number of (unknown) pieces, when it is uni-modal, and when it is concave/convex. © 2022 European Mathematical Society.

关键词： combinatorial method Density deconvolution shape constraints

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Reliability analysis of network systems subject to probabilistic propagation failures and failure isolation effects

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART O-JOURNAL OF RISK AND RELIABILITY 2022年第2期236卷 290-306页

作者： Su, Peng Wang, Guanjun Southeast Univ Sch Math Nanjing 210096 Peoples R China

In this article, the reliability of network systems subject to probabilistic propagation failure and failure isolation effects is considered. Probabilistic propagation failure is the failure of some components in a system, which will cause other components to fail with certain probabilities. Probabilistic propagation failure exists in various network systems, such as computing network system and nuclear power generating network system. Failure isolation means that the failure of a trigger component will lead to its corresponding dependent components being isolated from the network system. Since the failure isolation effect is activated only when the failure of trigger components occurs before the occurrence of probabilistic propagation failure, there exists a competing failure in the time domain between the failure of a trigger component and the components with probabilistic propagation failure effect. If a trigger component failure occurs first, the system is insensitive to any failures of components being isolated. In this article, a combinatorial method based on binary decision diagram is proposed to analyze the reliability of the network systems subject to probabilistic propagation failure and failure isolation effects. The method can be applied to any network system and any type of lifetime distribution of the system components. As an example, a wide area network system is analyzed. Some numerical results about reliability indexes are provided to verify the feasibility and accuracy of the proposed method.

关键词： Network systems probabilistic propagation failure failure isolation binary decision diagram combinatorial method

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combinatorial investigation on corrosion resistance of Ir-Ni-Ta alloys

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CORROSION SCIENCE 2024年 234卷

作者： Hu, Liwei Li, Fucheng Xie, Weijie Wang, Chao Li, Mingxing Wang, Gang Liu, Yanhui Shanghai Univ Sch Mat Sci & Engn Shanghai 200444 Peoples R China Chinese Acad Sci Inst Phys Beijing 100190 Peoples R China Univ Chinese Acad Sci Ctr Mat Sci & Optoelect Engn Beijing 100049 Peoples R China

Metallic glasses are often considered to exhibit remarkable corrosion resistance. However, the respective roles of chemical composition and amorphous structure remain unclear. In this work, we take Ir-Ni-Ta alloy system as a model system and utilize combinatorial fabrication and high-throughput characterizations to reveal the correlations between alloy composition and corrosion current density and corrosion potential. The results indicate strong correlations of corrosion current density with metal-metal bond strength and metal-oxygen bond strength, suggesting that the corrosion of the Ir-Ni-Ta metallic glasses is primarily controlled by chemical composition. However, an amorphous structure can facilitate the formation of denser passive film, and thus superimpose a positive influence on alloys that inherently exhibit corrosion resistance. Our findings would help the designing metallic glasses of superior corrosion resistance.

关键词： Ir-Ni-Ta Amorphous structure combinatorial method Corrosion resistance

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combinatorial optimization and synthesis of multiple promoted MoVNbTe catalysts for oxidation of propane to acrylic acid

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CATALYSIS TODAY 2021年 363卷 45-54页

作者： Tompos, Andras Sanchez-Sanchez, Maricruz Vegvari, Lajos Szijjarto, Gabor P. Margitfalvi, Jozsef L. Trunschke, Annette Schloegl, Robert Wanninger, Klaus Mestl, Gerhard Clariant Prod Deutschland GmbH Waldheimer Str 13 D-83052 Bruckmuhl Germany Combitech Nanotech Ltd Magyar Jakobinusok Tere 7 H-1122 Budapest Hungary Hungarian Acad Sci Res Ctr Nat Sci Inst Mat & Environm Chem POB 17 H-1525 Budapest Hungary Tech Univ Munich Dept Chem Lichtenbergstr 4 D-85748 Garching Germany Tech Univ Munich Catalysis Res Ctr Lichtenbergstr 4 D-85748 Garching Germany Max Planck Gesell Fritz Haber Inst Dept Inorgan Chem Faradayweg 4-6 D-14195 Berlin Germany

New MoVTeNb multi-component catalysts (so-called M1 phase) were designed and tested using combinatorial and high-throughput methods. An international team of academic institutes and industrial partners has cooperated to understand the chemistry occurring during the hydrothermal synthesis and crystallization of the M1 phase of the MoVTeNb mixed oxide. With this information, the optimization of this catalyst system could be targeted with the aim of improving catalyst performance for short chain alkane - ethane and propane oxidation reactions. Beside the elements responsible for the formation of the M1 phase (Mo, V, Te, and Nb) and promoters found to be advantageous in our previous work (Mn, Ni, W and citric acid), the following components were added to the synthesis mixture: Ce, Cu, Co, Cr and ethylene glycol. Contrary to the previous approach in this study, the V/Mo, Te/Mo and Nb/Mo ratios were kept constant. Consequently, the experimental space had nine variables. The discrete levels of variables are established in such a way that the number of the potential experimental points in the multi-dimensional experimental space was in the range of 200 000. Five new generations were designed using an optimization platform consisting of holographic optimization algorithm and artificial neural networks. Altogether 250 catalysts were prepared and tested. A complex objective function was created consisting of two independent catalytic performance characteristics - conversion and product selectivity - as well as the expected production costs and prices of the target product acrylic acid (AA) and export steam. The AA production costs were estimated assuming a recycle scheme for such a future AA plant with standard downstream equipment. The best catalysts in the group of catalysts with low vanadium content gave acrylic acid yields of 58% in the high throughput tests after five generations. On the bases of holographic maps, correlations between the composition of the synthesis mixt

关键词： Alkane oxidation Selective oxidation Oxidative dehydrogenation Acrylic acid Mo based multi-metal oxide catalyst MoVNbTe oxide combinatorial method High-throughput experimentation Hydrothermal synthesis Scale-up

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combinatorial experiments for discovering Al-C thin films with high strength and ductility

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INTERNATIONAL JOURNAL OF PLASTICITY 2023年第1期161卷

作者： Oh, Injong Kim, Hojang Son, Hansol Nam, Seungjin Choi, Hyunjoo Sim, Gi-Dong Korea Adv Inst Sci & Technol Dept Mech Engn Daejeon South Korea Kookmin Univ Sch Adv Mat Engn Seoul South Korea Ames Lab Div Mat Sci & Engn Ames IA USA

Aluminum (Al) is one of the most widely used structural material in various technologically relevant applications due to its light weight and formability. However, these advantages have been overshadowed by its relatively poor mechanical properties. In this paper, we report theexceptional mechanical properties of aluminum-carbon (Al-C) thin films deposited by multiple source co-sputtering. In the first set of experiments, a high-throughput combinatorial approach was taken to investigate mechanical and electrical properties of a blanket of Al-C thin film deposited with a compositional gradient. Hardness increased along with carbon addition, but at the cost of reduced electrical conductivity. These measurements allowed rapid screening of Al-C films and showed that regions with similar to 6at% carbon possess a good balance of mechanical and electrical properties (2.8 GPa and 142 Omega center dot nm). Micro-tensile experiments of freestanding Al, Al-C 6.4at%, and Al-C 10.3at% films were conducted to acquire tensile properties and understand the strengthening mechanism. Al-C films with 6.4at% and 10.3at% carbon both exhibited signifi-cantly increased yield stress over 300 MPa while retaining ductility. Unexpectedly, an upper yield followed by a fall in the stress was observed, which resembles the mechanical behavior of low-carbon steel. The unusual mechanical behavior of Al-C is attributed to formation of the Cottrell atmosphere. We also demonstrated that C impurities suppress stress-induced grain growth, which leads to improved microstructural stability during deformation. This paper demonstrates that carbon addition by co-sputter deposition is a viable approach for improving the strength and microstructural stability of Al thin films without loss in ductility.

关键词： Aluminum-carbon combinatorial method Thin films Sputter deposition Strengthening effect

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combinatorial development of antibacterial FeCoCr-Ag medium entropy alloy

材料展望（英文）

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材料展望（英文） 2023年第2期 134-141页

作者： Jiashu Cao Xin Jiang Qinghua Zhang Fusen Yuan Jihao Yu Fan Yang Mingxing Li Chao Wang Ying Lu Ming Li Weihua Wang Yanhui Liu Institute of Physics Chinese Academy of SciencesBeijing 100190People's Republic of China School of Physical Science University of Chinese Academy of SciencesBeijing 100049People's Republic of China Songshan Lake Materials Laboratory Guangdong 523808People's Republic of China Institute of Physics Chinese Academy of SciencesBeijing 100190People's Republic of China Institute of Physics Chinese Academy of SciencesBeijing 100190People's Republic of China Songshan Lake Materials Laboratory Guangdong 523808People's Republic of China Institute of Physics Chinese Academy of SciencesBeijing 100190People's Republic of China School of Physical Science University of Chinese Academy of SciencesBeijing 100049People's Republic of China Songshan Lake Materials Laboratory Guangdong 523808People's Republic of China Beijing Advanced Innovation Center for Materials Genome Engineering Beijing 100083People's Republic of China Institute of Physics Chinese Academy of SciencesBeijing 100190People's Republic of China Songshan Lake Materials Laboratory Guangdong 523808People's Republic of China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049People's Republic of China Beijing Advanced Innovation Center for Materials Genome Engineering Beijing 100083People's Republic of China

Antibacterial activity and mechanical properties of FeCoCr-Ag medium entropy alloys were studied via combinatorial fabrication paired with high-throughput *** was found that the antibacterial activity and mechanical properties exhibit non-linear dependence on the content of Ag *** the studied alloys,(FeCoCr)80Ag20 possesses an optimized combination of different properties for potential applications as antibacterial coating *** underlying mechanism is ascribed to the formation of a dual-phase structure that leads to competition between the role of Ag phase and FeCoCr phase at different Ag *** results not only demonstrate the power and effectiveness of combinatorial methods in multi-parameter optimization but also indicate the potential of high entropy alloys as antibacterial materials.

关键词： antibacterial metals and alloys medium entropy alloy combinatorial method

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combinatorial Physical Vapor Deposition : A New methodology for Exploring Eco-friendly Composition for Halide-based Resistive Switching Memory

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ADVANCED MATERIALS INTERFACES 2022年第18期9卷

作者： Lee, SangMyeong Bin Kim, Won Kim, Hee Jung Choi, Jin Hyuk Lee, Jae Myeong Gong, Oh Yeong Jung, Hyun Suk Sungkyunkwan Univ Sch Adv Mat Sci & Engn Suwon 16419 South Korea Sungkyunkwan Univ SKKU Inst Energy Sci & Technol SIEST Suwon 16419 South Korea

Due to the excellent charge mobility and tunable composition engineering, halide materials are being considered as new resistive switching (RS) memory materials. However, conventional halide materials-based RS memory devices primarily comprise lead-based compounds and solution-based processes, implying that researching new compositions for eco-friendly RS memory one-by-one synthesis would be extremely time consuming. This study reports the fabrication of an eco-friendly RS memory composition using a combinatorial physical vapor deposition (PVD) technique. The fabricated films are classified into three device types: RS memory, write-only-read-many, and insulator device type, based on the mole fraction of bismuth sulfide (Bi2S3). The 0.75BiI(3)-0.25Bi(2)S(3) mixture devices exhibit reliable and stable RS memory characteristics with an electroforming-free process. Additionally, the study of cohesive, formation, and migration energies via first-principles simulations demonstrate that the type of device changes because of their inability to develop and migrate their anion vacancies, implying that the amorphous nature of the device cannot retard the movement of iodine vacancies. This study is the first to investigate a new composition of eco-friendly halide materials-based RS memory via the combinatorial PVD method. These findings will serve as a powerful tool for investigating new compositions of eco-friendly RS memory.

关键词： combinatorial method first-principles simulations formation energy of vacancies halide materials migration energy resistive switching sulfide materials

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