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Effect of Si on high temperature oxidation of 30Cr13 stainless steel

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Journal of Iron and Steel Research International 2017年第5期24卷 561-568页

作者： Hong-huan mao Xing Qi Jing Cao Li-cong An yi-tao Yang School of Materials Science and Engineering Shanghai University Shanghai 200072 China

The effect of Si on the high temperature oxidation behavior of the 30Cr13 martensitic stainless steels was investigated. The underlying mechanism was further discussed by oxidation kinetics curves, scanning electron microscopy （SEM） and X-ray diffraction （XRD） analysis. It was ob- served that the addition of Si can significantly reduce the mass gain per unit area and the oxidation rate of the experimental steels. With the increase of Si content, the film surface composed of the wheat-like oxides turned into the small granular oxides after oxidation for 120 h. The SiO_2 film formed on the metal substrate inhibited the outward diffusion of the metal cation and the inward diffusion of the oxygen anion; thus, the high temperature oxidation resistance was enhanced.

关键词： Metallic material Martensitic stainless steel High temperature oxidation Oxidation kinetics

Evolution of vortex structure around a wall-mounted rough hemisphere

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Journal of Hydrodynamics 2023年第3期35卷 467-481页

作者： Xiang Qiu Hao-xuan Liu Jia-hua Li yi-zhou Tao Yu-lu Liu School of Science Shanghai Institute of TechnologyShanghai 201418China College of Urban Construction and Safety Engineering Shanghai Institute of TechnologyShanghai 201418China Shanghai Institute of Applied Mathematics and Mechanics Shanghai UniversityShanghai 200072China

In this paper,the large eddy simulation(LES)method is used to calculate Reynolds numbers the range in the range of 3000–30000(based on the diameter of the hemisphere D),and then the statistical analysis method is used to study the influence of Re on the characteristics of the flow field around the rough hemisphere and the evolution law of the tail *** effect of the Reynolds number on the structure of the rough hemisphere flow field and the evolution of vortex structure is studied by vorticity distribution,POD method,and correlation *** can be observed that with the increase of Reynolds number,the shear in the recirculating region of the rough hemisphere is enhanced,the large-scale structure is reduced,the small-scale structure is increased,and the angle between the hairpin vortex and the wall is reduced.λ_(ci)vortex identification and the Q-criterion are used to capture the evolution of a periodic vortex structure.Q-criterion gives the three-dimensional vortex structure behind the hemispherical *** is found that the horseshoe vortex and arch vortex generated by the incoming flow after passing through the hemisphere will interact with the wall surface to form a hairpin vortex,and the hairpin vortex structure will continue to evolve downstream to form a new vortex structure.

关键词： Rough hemisphere large eddy simulation(LES) POD method two-point velocity correlation function

Liver injury in COVID-19:What do we know now?

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Hepatobiliary & Pancreatic Diseases International 2020年第5期19卷 407-408页

作者： Hua-Yu Yang Bao Jin yi-Lei mao Department of Liver Surgery Peking Union Medical College(PUMC)HospitalPUMC&Chinese Academy of Medical Sciences(CAMS)Beijing 100730China

Coronavirus disease 2019(COVID-19)caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)infection has become a global *** large cohort studies have reported liver injury in COVID-19 ***,we reviewed the manifestations and causes of liver injury in COVID-19 patients and the effects of liver injury on the clinical outcomes based on the published literature.

关键词： acute respiratory injury

Effect of interaction of refractories with Ni-based superalloy on inclusions during vacuum induction melting

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International Journal of Minerals,Metallurgy and Materials 2020年第11期27卷 1551-1559页

作者： Xiao-yong Gao Lin Zhang xuan-hui Qu Xiao-wei Chen yi-feng Luan Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China

This study documents laboratory-scale observation of the interactions between the Ni-based superalloy FGH4096 and *** different crucibles were tested—MgO,Al2O3,and MgO–*** studied the variations in the compositions of the inclusions and the alloy–crucible interface with the reaction time using scanning electron microscopy equipped with energy dispersive X-ray spectroscopy and Xray *** results showed that the MgO and MgO–spinel crucibles form MgO-containing inclusions(Al–Mg oxides and Al–Mg–Ti oxides),whereas the inclusions formed when using the Al2O3 crucible are Al2O3 and Al–Ti *** observed a new MgAl2O4 phase at the inner wall of the MgO crucible,with the alloy melted in the MgO crucible exhibiting fewer *** new phase occurred at the inner wall of the Al2O3 *** discuss the mechanism of interaction between the refractories and the Ni-based *** erosion was found to predominate in the Al2O3 crucible,whereas dissolution and chemical reactions dominated in the MgO *** reaction was observed between three crucibles and the Ti of the melt although the Ti content(3.8wt%)was higher than that of Al(2.1wt%).

关键词： FGH4096 superalloy vacuum induction melting crucible inclusion Mg/O ratio

Bacteria-assisted delivery and oxygen production of nano-enzyme for potent radioimmunotherapy of cancer

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Nano Research 2022年第8期15卷 7355-7365页

作者： Jing Ni Hailin Zhou Jingyu Gu Xinpei Liu Jie Chen xuan yi Kai Yang State Key Laboratory of Radiation Medicine and Protection School of Radiation Medicine and Protection&School for Radiological and Interdisciplinary Sciences(RADX)Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215123China School of Pharmacy Jiangsu Key Laboratory of Inflammation and Molecular Drug TargetsNantong UniversityNantong 226001China Dushu Lake Hospital Affiliated to Soochow University Medical Center of Soochow UniversitySuzhou 215123China

Tumor-targeting attenuated Salmonella could induce certain antitumor therapeutic effect through its proliferation characteristic and the consequent activated immune response,while host defense cells represented by neutrophils would trap and eliminate these invading bacteria via producing excess hydrogen peroxide(H_(2)O_(2))-including reactive oxygen species in the bacteriainfected tumor,thereby impairing the efficacy of the bacteria treatment of ***,we attempt to combine bacteria treatment and oxygen-dependent radioimmunotherapy of tumor through injection of neutrophil-targeted nano-catalase into the bacteria-treated mice for perfect tumor treatment *** albumin is used to coat catalase and deliver it to the neutrophils infiltrated in bacteria-infected tumor *** advantage of the generating H_(2)O_(2)by neutrophils,easily-diffused oxygen is produced and spread the whole tumor under the catalysis of nano-enzyme,leading to enhanced radiotherapy of hypoxic tumor ***,the optimized tumor microenvironment,synergistically caused by potent immune-stimulation of bacteria,generating oxygen and tumor radiotherapy,would boost the antitumor *** novel combination therapy strategy holds great promise to provide new ideas for future clinical cancer treatment.

关键词： bacteria neutrophil hydrogen peroxide denatured albumin radiotherapy

Bimetal nanoparticles hybridized with carbon nanotube boosting bifunctional oxygen electrocatalytic performance

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Rare Metals 2022年第8期41卷 2616-2623页

作者： Chen Sun Yong-Jie Zhao xuan-yi Yuan Jing-Bo Li Hai-Bo Jin Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing100081China Beijing Key Laboratory of Opto-Electronic Functional Materials&Micro-Nano Devices Department of PhysicsRenmin University of ChinaBeijing100872China

Developing bifunctional oxygen catalysts with high efficiency and low cost to replace platinum-group metal catalysts commonly utilized in metal-air batteries is critically *** this article,a convenient method to synthesis NiFe nanoparticles hybridized with N-doped carbon nanotube(NiFe@N-CNTs)is *** performance analysis indicates that Ni_(x)Fc_(1-x)@N-CNTs offers favorable oxygen reduction reaction(ORR)kinetics(onset potential(E_(onset))is 0.87 V and half-wave potential(E_(1/2))is0.84 V),together with excellent oxygen evolution reaction(OER)performance(an overpotential of 270 mV to drive10 mA·cm^(-2)).Contributed by the synergetic effect between NiFe alloy and N-CNTs,when being utilized as air cathode,rechargeable Zn-air batteries present superior cycling stability for over 150 *** research provides a universal strategy to synthesize the hybrids of intertwined carbon nanotube matrix loaded with alloy nanoparticles.

关键词： NiFe alloy Oxygen evolution reaction(OER) Oxygen reduction reaction(ORR) Zn-air batteries

A Fast Evolutionary Learning to Optimize CNN

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Chinese Journal of Electronics 2020年第6期29卷 1061-1073页

作者： CHEN Jinyin LIN Xiang GAO Shangtengda XIONG Hui ZHANG Longyuan LIU yi xuan Qi College of Information Engineering Zhejiang University of Technology NESA Lab Zhejiang University

Deep neural networks(DNNs) show great performance in lots of *** neural network(CNN) is one of the classic DNNs,and various modified CNNs have been brought up,such as DenseNet,GoogleNet,ResNet,*** diverse tasks,a unique structure of CNN may show its ***,how to design an effective CNN model for a practical task is a *** this paper,we model the architecture optimization of CNN as an optimization problem and design a Genetic network programming based Fast evolutionary learning(GNP-FEL) to optimize ***-FEL contains three main ideas:First GNP is adopted to optimize CNN architecture and hyperparameters,which can build diverse network structures and make network parameters selfevolve;Second multi-objective optimization is designed by balancing both CNN model efficiency and structure compactness;Last a novel incremental training method is proposed to train offspring CNN models in GNP,which is capable of reducing time complexity *** have validated that GNP-FEL can quickly evolve a CNN classifier with a sufficiently compact *** the classifier has a comparable classification effect to state-ofthe-art CNN model.

关键词： Optimisation techniques CNN classifier Other topics in statistics multiobjective optimization architecture optimization optimize CNN Combinatorial mathematics DNN GNP-FEL genetic network programming diverse network structures structure compactness network parameters state-ofthe-art CNN model deep neural networks optimization problem CNN model genetic algorithms diverse tasks convolutional neural nets offspring CNN models neural net architecture practical task convolutional neural network Neural computing techniques learning (artificial intelligence) Knowledge engineering techniques fast evolutionary learning

An Empirical Comparison Between Tutorials and Crowd Documentation of Application Programming Interface

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Journal of Computer Science & Technology 2021年第4期36卷 856-876页

作者： yi-xuan Tang Zhi-Lei Ren He Jiang Xiao-Chen Li Wei-Qiang Kong School of Software Dalian University of TechnologyDalian 116000China Key Laboratory for Ubiquitous Network and Service Software of Liaoning Province Dalian 116000China School of Computer Science Sz Technology Beijing Institute of TechnologyBeijing 100000China

API(application programming interface)documentation is critical for developers to learn ***,it is unclear whether API documentation indeed improves the API learnability for *** this paper,we focus on two types of API documentation,i.e.,official API tutorials and API crowd ***,we analyze API coverage and check API consistencies in API documentation based on the API ***,we conduct a survey and extract several characteristics to analyze which API documentation can help developers learn *** findings show that:1)API crowd documentation can be regarded as a supplement to the official API tutorials to some extent;2)the concerns for frequently-used APIs between different types of API documentation show a huge mismatch,which may prevent developers from deeply understanding the usages of APIs through only one type of API documentation;3)official API tutorials can help developers seek API information on a long page and API crowd documentation could provide long codes for a particular programming *** findings may help developers select the suitable API documentation and find the useful information they need.

关键词： API documentation empirical study quantitative analysis

Adaptive evolvement of information age C^4ISR structure

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Journal of Systems Engineering and Electronics 2015年第2期26卷 301-316页

作者： Yushi Lan Kebo Deng Shaojie mao Heng Wang Kan yi Ming Lei The 28th Research Institute China Electronics Technology Group Corporation Science and Technology on Information Systems Engineering Laboratory

Command, control, communication, computing, intel- ligence, surveillance and reconnaissance （C^4ISR） in information age is a complex system whose structure always changes ac- tively or passively during the warfare. Therefore, it is important to optimize the structure, especially in ambiguous and quick-tempo modern warfare. This paper proposes an adaptive evolvement mechanism for the C^4ISR structure to survive the changeable warfare. Firstly, the information age C^4ISR structure is defined and modeled based on the complex network theory. Secondly, taking the observe, orient, decide and act （OODA） model into consideration, four kinds of loops in the C^4ISR structure are pro- posed and their coefficient of networked effects （CNE） is further defined. Then, the adaptive evolvement mechanisms of the four kinds of loops are presented respectively. Finally, taking the joint air-defense C^4ISR as an example, simulation experiments are im- plemented, which validate the evolvement mechanism and show that the information age C41SR structure has some characteristics of small-world network and scale-free network.

关键词： C4ISR structure complex network loop adaptive evolvement coefficient of networked effects(CNE)