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Composition Engineering Opens an Avenue Toward Efficient and Sustainable Nitrogen Fixation

Energy & Environmental Materials 2024年第1期7卷 313-325页

作者： xiaolin wang Liming Yang Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationWuhan 430074China Hubei Key Laboratory of Materials Chemistry and Service Failure Wuhan 430074China Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica Wuhan 430074China Hubei Engineering Research Center for Biomaterials and Medical Protective Materials Wuhan 430074China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China

In this work,we open an avenue toward rational design of potential efficient catalysts for sustainable ammonia synthesis through composition engineering strategy by exploiting the synergistic effects among the active sites as exemplified by diatomic metals anchored graphdiyne via the combination of hierarchical high-throughput screening,first-principles calculations,and molecular dynamics *** 43 highly efficient catalysts feature ultralow onset potentials(|U_(onset)|≤0.40 V)with Rh-Hf and Rh-Ta showing negligible onset potentials of 0 and-0.04 V,*** high catalytic activities of Rh-Hf and Rh-Ta can be ascribed to the synergistic *** forming heteronuclears,the combinations of relatively weak(such as Rh)and relatively strong(such as Hf or Ta)components usually lead to the optimal strengths of adsorption Gibbs free energies of reaction *** origin can be ascribed to the mediate d-band centers of Rh-Hf and Rh-Ta,which lead to the optimal adsorption strengths of intermediates,thereby bringing the high catalytic *** work provides a new and general strategy toward the architecture of highly efficient catalysts not only for electrocatalytic nitrogen reduction reaction(eNRR)but also for other important *** expect that our work will boost both experimental and theoretical efforts in this direction.

关键词： composition engineering strategy diatomic catalysts electrocatalytic nitrogen reduction reaction first-principles calculations graphdiyne hierarchical high-throughput screening synergistic effects

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Multi–physical-field characteristics modeling and structure optimization for kW-level ultra-high-speed PM motors with integrated support system

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Chinese Journal of Aeronautics 2023年第4期36卷 455-467页

作者： Qixing GAO xiaolin wang Yan ZHANG College of Automation Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China School of Intelligence Science and Control Engineering Jinling Institute of TechnologyNanjing 211169China

In the aerospace industry,the low-mass ultra-high-speed flywheel system play a critical *** this paper,a kW-level Ultra-High Speed Permanent Magnet Synchronous Motor(UHSPMSM)as the core component of flywheel system is proposed and analyzed with consideration of multiple physical fields,including electromagnetic characteristics,mechanical strength and rotor *** integrated support structure is put forward to improve rotation accuracy and operation stability of the ***,influence of the integrated support structure on critical speed is explored,and the key parameters such as support position and support stiffness are ***,the rotor strength is analyzed by analytical model developed of rotor stress that can deal with multiple boundary *** and thickness of the sleeve are optimized,and range of interference value is accurately limited based on four extreme operating *** 3-D Finite Element Model(FEM)is used to validate the strength characteristics and stress distribu-tion of rotor.A 1.5 kW-150000 r/min UHSPMSM with integrated support system is manufactured and *** feasibility of UHSPMSM proposed and the accuracy of analysis method are verified through electromagnetic,temperature rise and vibration characteristics *** machine prototype realizes the load operation at rated speed and the multi-physical-field characteristics achieve the design specification.

关键词： Flywheel energy storage Integrated support system Multi–physical-field charac-teristics Mechanical strength Rotor dynamics Ultra-high-speed motor

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Ultra-sensitive detection of uranyl ions with a specially designed high-efficiency SERS-based microfluidic device

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Science China Chemistry 2019年第8期62卷 1064-1071页

作者： Xuan He Shaofei wang Yu Liu xiaolin wang College of Chemistry Sichuan UniversityChengdu 610064China Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900China Institute of Materials China Academy of Engineering PhysicsMianyang 621907China China Academy of Engineering Physics Mianyang 621900China

The uranyl ion(UO22+) poses high risks to human health and the environment, hence its detection and monitoring is of utmost significance. However, the development of an ultra-sensitive, high-efficiency and convenient approach for on-site detection of UO22+ remains a challenge. Herein, a reliable and reusable surface-enhanced Raman spectroscopy(SERS)-based microfluidic biosensor was developed for rapid detection of UO22+ in real samples. The detection protocol involved the reaction of 5′-Rhodamine B(RhB)-labeled double-stranded DNA for UO22+-specific DNAzyme-cleavage reaction in a U-shaped microchannel. Then, the reaction products were delivered into three parallel samples for high-throughput tests by SERS biochips,where 3 D ZnO-Ag mesoporous nanosheet arrays(MNSs) were modified with a single-stranded DNA(ssDNA). The ssDNAwas sequence-complementary with the 5′-RhB-labeled cleaved-stranded DNA(csDNA) from the reaction products. By the hybridization of ssDNA and csDNA, the signal probe RhB was fixed close to the surface of the ZnO-Ag MNSs to enhance the Raman signal. The limit of detection for UO22+ with the microfluidic-SERS biosensor was 3.71×10-15 M. An over 20,000-fold selectivity towards UO22+ response was also achieved in the presence of 15 other metal ions. The high-throughput microfluidicSERS biosensor operated well for practical UO22+ detection, with excellent recoveries in contaminated river and tap water from95.2% to 106.3%(relative standard deviation(RSD)<6.0%, n=6). Although the SERS-based microfluidic biosensor developed in this study was deployed for the detection of UO22+, the reusable and high-efficiency system may be expanded to the detection of other analytes on-site.

关键词： uranyl ion DNAzyme SERS microfluidic device high-throughput reusable

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Metabolic Dysfunction-associated Fatty Liver Disease (MAFLD) and Viral Hepatitis

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Journal of Clinical and Translational Hepatology 2022年第1期10卷 128-133页

作者： xiaolin wang Qing Xie Department of Infectious Diseases Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina

A new definition of metabolic dysfunction-associated fatty liver disease(MAFLD)was proposed in *** change from nonalcoholic fatty liver disease(NAFLD)to MAFLD highlights the metabolic abnormalities that accompany fatty *** diagnosis of MAFLD does not require exclusion of secondary causes of liver diseases and alcohol ***,MAFLD may coexist with other types of liver diseases,such as viral hepatitis,a disease that remains the most common cause of liver disease-related *** the increasing prevalence of MAFLD,patients with coincidental MAFLD and viral hepatitis are frequently encountered in clinical *** this review,we mainly summarize the mutual relationship between hepatitis B/C and systematic metabolism dysfunction related to *** discuss the impact of MAFLD on progression of viral hepatitis and the *** unaddressed clinical problems related to concomitant MAFLD and viral hepatitis are also identified.

关键词： Metabolic dysfunction-associated fatty liver disease Chronic hepatitis B Chronic hepatitis C

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Understanding the Mechanism of the Oxygen Evolution Reaction with Consideration of Spin

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Electrochemical Energy Reviews 2021年第1期4卷 136-145页

作者： Xiaoning Li Zhenxiang Cheng xiaolin wang Institute for Superconducting and Electronic Materials(ISEM) Australia Institute for Innovative MaterialsInnovation CampusUniversity of WollongongNorth WollongongNSW 2500Australia

The oxygen evolution reaction(OER)with its intractably high overpotentials is the rate-limiting step in many devices,including rechargeable metal-air batteries,water electrolysis systems and solar fuel ***,spin state transitions from spin singlet OH^(-)/H_(2)O reactants to spin triplet O_(2)product have not yet received enough *** view of this,this article will discuss electron behaviours during OER by taking into consideration of spin *** main conclusion is that,regardless of the possible adopted mechanisms(the adsorbate evolution mechanism or the lattice oxygen mechanism),the underlying rationale of OER is that three in four electrons being extracted from adsorbates should be in the same spin direction before O=O formation,superimposing high requirements on the spin structure of ***,upon fully understanding of the OER mechanism with considerations of spin,the awareness of the coupling between spin,charge,orbital and lattice parameters is necessary in the optimization of geometric and electronic structures in transition metal *** on this,this article will discuss the possible dependency of OER efficiency on the electrocatalyst spin configuration,and the relevance of well-recognized factors with spin,including the crystal field,coordination,oxidation,bonding,the e_(g) electron number,conductivity and *** is hoped that this article will clarify the underlying physics of OER to provide rational guidance for more effective design of energy conversion electrocatalysts.

关键词： Oxygen evolution reaction Water splitting Spin Mechanism Descriptors

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Circulating fibroblasts present neutrophil-like features in severe COVID-19 cases revealed by single-cell landscape analyses

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Genes & Diseases 2023年第6期10卷 2233-2236页

作者： Xiangjun Liu Jingang Gui xiaolin wang Laboratory of Tumor Immunology Beijing Pediatric Research InstituteBeijing Children's HospitalCapital Medical UniversityNational Center for Children's Health(NCCH)Beijing 100045China

Severe acute respiratory syndrome coronavirus-2(SARSCoV-2),which causes coronavirus disease 2019(COVID-19)and initially infects epithelial cells of the upper respiratory tract,has recently caused a global health emergency and is still a potential threat to humans.1 Multiple studies have suggested alterations in the immune system,including excessive neutrophil activation and lymphopenia,and excessive inflammatory responses as the key mechanisms for severesymptoms.2However,which cell types contribute to excessive inflammation remains to be *** analysis of human blood immune cells provides insights into the coordinated response to SARSCoV-2 infections and is a significant task for restraining the virus and controlling disease progression.

关键词： neutrophil respiratory alterations

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Evaluating the impacts of hugepage on virtual machines

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Science China(Information Sciences) 2017年第1期60卷 35-50页

作者： xiaolin wang Taowei LUO Jingyuan HU Zhenlin wang Yingwei LUO School of Electronics Engineering and Computer Science Peking University Department of Computer Science Michigan Technological University

Modern applications often require a large amount of memory. Conventional 4KB pages lead to large page tables and thus exert high pressure on TLB address translations. This pressure is more prominent in a virtualized system, which adds an additional layer of address translation. Page walks due to TLB misses can result in a significant performance overhead. One effort in reducing this overhead is to use hugepage. Linux kernel has supported transparent hugepage since 2.6.38, which provides an alternate large page size. Generally,hugepage demonstrates better performance on address translations and page table modifications. This paper first analyzes the impact of hugepage on native system, and then, compares the impact of hugepage on different memory virtualization approaches: hardware-assisted paging(HAP), shadow paging, and *** observe that the current implementation of transparent hugepage is inefficient. It cannot exploit the full performance advantage of hugepages. Worse yet, the conservative strategy of transparent hugepage may conflict with existing OS functions, which can lead to performance degradation. So, we propose a new memory allocation strategy, alignment-based hugepage(ABH) that promotes hugepage allocations. We apply ABH to different paging modes in virtualized systems. The results show that the new allocation strategy can significantly reduce TLB misses and up to 90% page walk cycles due to TLB misses and thus improve the performance in real world applications.

关键词： hugepage memory management translation lookaside buffer virtualization performance

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Experimental determination of heat generation rates of lithium-ion batteries by thermal protection method

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Science China Technological Sciences 2024年第12期67卷 3647-3658页

作者： SHI JingHe ZHANG HengYun YU Hong wang xiaolin School of Mechanical and Automotive Engineering Shanghai University of Engineering Science School of Engineering University of Tasmania

Experimental determination of heat generation rates is crucial in the thermal safety design of automotive batteries. A thermal protection method(TPM) is proposed to determine the heat generation rates of 18650 cylindrical lithium-ion batteries under different discharge rates. The physical model based on the thermal protection method is established, and its feasibility is demonstrated through theoretical analysis. In the experimental setup, by introducing lateral thermal protection batteries(TPB) to minimize the heat loss of the center test battery(CTB), heat generation rates of the battery can be obtained based on the temperature change of the CTB. The average heat generation rates of the battery at 1, 2, and 3 C discharge rates are found to be0.255, 0.844, and 1.811 W, respectively, which can be quadratically correlated with the discharge rate. In addition, a benchmark test of the present measurement against the commonly used accelerating rate calorimeter(ARC) was conducted. Relatively small deviations of 3.77%, 4.20%, and 1.09% were identified in the heat generation rates for the discharge rates at 1, 2, and 3 C. In comparison with the ARC equipment, the present TPM can be more representative of the transient battery heat generation characteristics with a much shorter time for thermal equalization. Finally, to further verify the accuracy of the present method,standard samples of the same size as the actual battery were made, which were capable of controlling heat generation through a direct current power supply. A comparison of the heat inputs of the standard sample with the heat generation rates measured by the thermal protection method shows a relative deviation of 1.01% maximum. With high measurement accuracy and an easy-tobuild experimental setup, the proposed method has promising prospects in automotive applications.

关键词： lithium-ion batteries thermal protection method transient heat generation rate average heat generation rate

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Atomic-scale engineering of oxide interfaces yields a new family of synthetic magnetic structures

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Science Bulletin 2017年第17期62卷 1169-1170页

作者： David L.Cortie xiaolin wang ARC Centre of Excellence in Future Low-Energy Electronics Technologies University of WollongongNorth WoUongongNSW 2522Australia The Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of Wollongong North WollongongNSW 2522Australia

A grand challenge in the field of magnetism is to find material systems that exhibit spin structures ranging from simple ferromagnets to exquisite non-collinear *** bulk three-dimensional(3D)materials,however,the magnetic exchange interactions are constrained by the crystal symmetry and quantum chemistry,making it challenging to adjust the intrinsic magnetic structure.A

关键词：铁磁性工程师原子尺度合成结构族氧化物交换相互作用界面

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A Dynamic Building Method of Mobile Agent Path Based on Referral Networks

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Chinese Journal of Electronics 2014年第1期23卷 1-5页

作者： wang xiaolin ZENG Guangzhou XU Xinshun School of Computer Science and Technology Shandong University

The mobile agent is a computer program that is able to migrate continuously among hosts in a network and use host service to meet its task. The host,known as workplace, can be regarded as a proxy of social member. The sequence of workplaces on which the mobile agent completed its tasks is called path. In this paper, we propose a dynamic building method of mobile agent path with minimum payment based on referral. By referral, the next workplace of mobile agent can be recommended by the current workplace provider based on his acquaintance knowledge. The simulation results on a random network model show that the more acquaintance relationships there are on the referral network, the more efficiently the mobile agent path can be built, and the fewer costs need to be paid on the path.

关键词： Mobile agent Path building Referral network Acquaintance tree Minimum payment

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