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Dislocation me diate d dynamic tension-compression asymmetry of a Ni_(2)CoFeV_(0.5)Mo_(0.2) medium entropy alloy

Journal of Materials Science & Technology 2023年第28期159卷 204-218页

作者： ao Meng xiang chen Yazhou Guo Yiping Lu Yonghao Zhao Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China

Although tension-compression(T-C)asymmetry in yield strength was rarely documented in coarse-grained face centered cubic(FCC)metals as critical resolved shear stress(CRSS)for dislocation slip differs little between tension and compression,the T-C asymmetry in strength,i.e.,higher strength when loaded in compression than in tension,was reported in some FCC high entropy alloys(HEAs)due to twinning and phase transitions activated at high strain regimes in *** this paper,we demonstrate a reversed and atypical tension-compression asymmetry(tensile strength markedly exceeds compressive strength)in a non-equiatomic FCC Ni_(2)CoFeV_(0.5)Mo_(0.2) medium entropy alloy(MEA)under dynamic loading,wherein dislocation slip governs dynamic deformation without twins or phase *** asymme-try can be primarily interpreted as higher CRSS and more hard slip modes(lower average Schmid factor)activated in grains under dynamic tension than ***,larger strain rate sensitivity in dy-namic tension overwhelmingly contributes to the higher flow stress,thanks to the occurrence of more immobile Lomer-locks,narrower spacing of planar slip bands and higher dislocation *** finding may provide some insights into designing MEAs/HEAs with desired properties under extreme conditions such as blast,impact and crash.

关键词： Medium entropy alloy Dynamic deformation Tension-compression asymmetry Slip trace analysis EBSD and TEM

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A vector hybrid triboelectric sensor(HTS)for motion identification via machine learning

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Nano Research 2023年第7期16卷 10120-10130页

作者： Nannan Zhou Hongrui ao x.aoming chen Shan Gao Hongyuan Jiang School of Mechatronics Engineering Harbin Institute of TechnologyHarbin 150001China School of Control Engineering Northeastern University at QinhuangdaoQinhuangdao 066004China

Rapidly responding and cost-effective sensors played a crucial role in industrial ***,the lack of versatile strategies for identifying and classifying operating states on various practical behaviors has limited the rapid development of monitoring *** study developed a vector hybrid triboelectric sensor(HTS)with surface nanocrystalline containing triboelectric vibration and rotation units(triboelectric vibration unit(TVU),triboelectric rotation unit(TRU))capable of detecting the vibrational and rotary states of the *** synchronous detection of two sensing signals can be achieved due to the hierarchical structure as the basic unit of the HTS,which contributed to reducing the volume and spatial distribution of the *** on the voltage/current/charge(U-I-Q)signal amplitudes and phase features generated by the TVU,the vibration frequency and orientation of the device can be identified by using a double-layer neural network(D-LNN),in which the accuracy reaches 96.5%and 95.5%***,by combining logistic regression,D-LNN,and linear regression,the accuracy of the TRU for rotary classification exceeds 93.5%in practical *** this study,the great potential application of the HTS combined with the machine learning methods was successfully explored and exhibited and it might speed up the development of industrial detection in the near future.

关键词： vector triboelectric sensor surface nanocrystalline hierarchical structure sensing properties state detection machine learning

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Flow cytometric assessment of the effects of chlorine, chloramine, and UV on bacteria by using nucleic acid stains and 5-cyano-2,3-ditolyltetrazolium chloride

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Frontiers of Environmental Science & Engineering 2016年第6期10卷 83-91页

作者： xuebiao Nie Wenjun Liu Mo chen Minmin Liu Lu ao School of Environment Tsinghua University Beijing 100084 China China Gezhouba Group Real Estate Corporation Beijing 100020 China Department of Architecture and Environmental Engineering Logistic Engineering University of PLA Chongqing 401331 China

Flow cytometry （FCM） has been widely used in multi-parametric assessment of cells in various research fields, especially in environmental sciences. This study detected the metabolic activity of Escherichia coli and Staphylococcus aureus by using an FCM method based on 5-cyano-2,3-ditolyltetrazolium chloride （CTC）; the accuracy of this method was enhanced by adding SYTO 9 and 10% R2A broth. The disinfection effects of chlorine, chloramine, and UV were subsequently evaluated by FCM methods. Chlorine demonstrated stronger and faster destructive effects on cytomembrane than chloramine, and nucleic acids decomposed afterwards. The metabolic activity of the bacteria persisted after the cytomembmnewas damaged as detected using CTC. Low-pressure （LP） UV or medium-oressure （MP） UV treatments exerted no significant effects on membrane permeability. The metabolic activityof the bacteria decreased with increasing UV dosage, and MP-UV was a stronger inhibitor of metabolic activity than LP-UV. Furthermore, the membrane of Gram-positive S. aureus was more resistant to chlorine/chloramine than that of Gram-negative E. coil In addition, S. aureus showed higher resistance to UV irradiation than E. coli.

关键词： Flow cytometry Escherichia coli Staphylococcus aureus UV CTC SYTO 9

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0D/1D AgI/MoO_(3)Z-scheme heterojunction photocatalyst:Highly efficient visible-light-driven photocatalyst for sulfamethoxazole degradation

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Chinese Chemical Letters 2021年第10期32卷 3226-3230页

作者： Jing xu Juan chen Yanhui ao Peifang Wang Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education College of EnvironmentHohai UniversityNanjing 210098China

Low dimension nano photocatalysts show great potential in the field of treating contaminated water for their large surface area and size *** this study,a 0 D/1 D AgI/MoO_(3)Z-scheme photocatalyst with striking photocatalytic performance was constructed *** one-dimensional MoO_(3)nanobelts were prepared by a simple hydrothermal method,and then it was modified by AgI nanoparticles in a handy deposition *** choosing sulfamethoxazole(SMZ)as the target contaminant,the rate constant value of the optimal 0 D/1 D AgI/MoO_(3)composite could hit up to 0.13 min^(-1),which is nearly 22.4 times and 32.5 times as that of pure MoO_(3)(0.0058 min^(-1))and AgI(0.0040 min^(-1)),respectively.A series of detailed characterizations give evidences that the charge transfer in the composite followed Z scheme ***,efficient separation/transfer and the remained high redox activity of photogenerated carriers played a vital role in the sharply enhanced photocatalytic *** possible degradation pathways of SMZ were proposed based on the intermediates detected by high-performance liquid chromatography-mass spectrometry(HPLC-MS).Meanwhile,the magnificent cyclic stability makes the material a promising material in the practical application.

关键词： MoO_(3)-based-photocatalyst 0D/1D Z-scheme Sulfamethoxazole Visible-light-responsive

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Transformation toughening of Al_2O_3/ZrO_2 laminated ceramics with residual compressive stress

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Journal of University of Science and Technology Beijing 2007年第5期14卷 449-453页

作者： Bei chen Chuan cheng Lan xiong Li-ao Wang Key Lab of High Voltage Engineering and Electrical New Technology Chongqing University Chongqing 400044 China Institute of Resource and Environment Science Chongqing University Chongqing 400044 China

With the help of scanning electronic microscopy and x-ray diffraction, the relationships of microstructure characteristics, phase assemblage, and fracture micrograph of Al2O3/ZrO2 laminated ceramics were studied. Compared with monolithic Al2O3/ZrO2 ceramics, the existence of surface compressive stresses greatly restrained the growth of ZrO2 and Al2O3 grains at high sinter temperature, fined the grain size, and increased the content of metastable t-ZrO2, which made the fracture transformation energy quantity 70% higher than that of the monolithic ceramics. The trans-granular and inter-granular fracture features were observed in the surface and center layers, which further verified that transformation toughening is the main mechanism, whereas, micro-crack toughening is helpful for enhancing fracture toughness.

关键词： laminated ceramics transformation toughening fracture micrograph grain size surface compressive stress

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Safe, Efficient and Socially‑Compatible Decision of Automated Vehicles: A Case Study of Unsignalized Intersection Driving

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Automotive Innovation 2023年第2期6卷 281-296页

作者： Daofei Li ao Liu Hao Pan Wentao chen Institute of Power Machinery and Vehicular Engineering Faculty of EngineeringZhejiang UniversityNo.38 Zheda RoadXihu DistrictHangzhou 310027ZhejiangChina

Safe and smooth interaction between other vehicles is one of the ultimate goals of driving ***,recent reports of demonstrative deployments of automated vehicles(AVs)indicate that AVs are still difficult to meet the expecta-tion of other interacting drivers,which leads to several AV accidents involving human-driven vehicles(HVs)without the understanding about the dynamic interaction *** investigating 4300 video clips of traffic accidents,it is found that the limited dynamic visual field of drivers is one leading factor in inter-vehicle interaction accidents.A game-theoretic decision algorithm considering social compatibility is proposed to handle the interaction with a human-driven truck at an unsignalized *** from a probabilistic model for the visual field characteristics of truck drivers,social fit-ness and reciprocal altruism in the decision are incorporated in the game payoff ***-in-the-loop experiments are carried out,in which 24 subjects are invited to drive and interact with AVs deployed with the proposed algorithm and two comparison ***,207 cases of intersection interactions are obtained and analyzed,which shows that the proposed decision-making algorithm can improve both safety and time efficiency,and make AV decisions more in line with the expectation of interacting human *** findings can help inform the design of automated driving decision algorithms,to ensure that AVs can be safely and efficiently integrated into the human-dominated traffic.

关键词： Automated driving Social compatibility Game theory Interactive driving Unsignalized intersection

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Storage capacity model for cloud download

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The Journal of China Universities of Posts and Telecommunications 2012年第5期19卷 83-91页

作者： xU Ying-ying ao Nai-xiang chen Chang-jia School of Electronics and Information Engineering Beijing Jiaotong UniversityBeijing 100044China

With the rise and world wide deployment of cloud utilities, the principle of the cloud download is proposed to provide high-quality file content distribution by using dedicated servers as cloud cache to guarantee the data availability and enhance the data transfer rate. As the system scales up to a large population, how to design appropriate storage capacity of cloud cache is a key challenge for cloud download. In this paper, primary elements impacting on storage capacity are explored through deliberating in large-scale commercial cloud download system, i.e. general user usage pattern and available period. And based on statistical analysis of real-world traces, we formulate storage capacity related to these two elements, which is the original contribution different from all previous works. This model gives guidance of potential system policy design. Finally, the effectivity of this model is demonstrated by simulation results compared with empirical data of practical system.

关键词： cloud download storage capacity model available period usage pattern

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Efficient complementary caching for ISP-aware networks

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The Journal of China Universities of Posts and Telecommunications 2012年第5期19卷 66-76页

作者： ao Nai-xiang xU Ying-ying chen Chang-jia School of Electronic Information Engineering Beijing Jiaotong UniversityBeijing 100044China

Internet service providers （ISPs） have taken some measures to reduce intolerable inter-lSP peer-to-peer （P2P） traffic costs, therefore user experiences of various P2P applications have been affected. The recently emerging offiine downloading service seeks to improve user experience by using dedicate servers to cache requested files and provide high-speed uploading. However, with rapid increase in user population, the server-side bandwidth resource of offline downloading system is expected to be insufficient in the near future. We propose a novel complementary caching scheme with the goal of mitigating inter-ISP traffic, alleviating the load on servers of Internet applications and enhancing user experience. Both architecture and caching algorithm are presented in this paper. On the one hand, with full knowledge of P2P file sharing system and offiine downloading service, the infrastructure of complementary caching is designed to conveniently be deployed and work together with existing platforms. The co-operational mechanisms among different major components are also included. On the other hand, with in-depth understanding of traffic characteristics that are relevant to caching, we develop complementary caching algorithm with respect to the density of requests, the redundancy of file and file size. Since such relevant information can be real-time captured in our design, the proposed policy can be implemented to guide the storage and replacement of caching unities, Based on real-world traces over 3 months, we demonstrate that the complementary caching scheme is capable to achieve the ＇three-win＇ objective. That is, for l＇2P downloading, over 50% of traffic is redirected to cache; for offline downloading, the average server-dependence of tasks drops from 0.71 to 0.32; for user experience, the average P2P transfer rate is increased by more than 50 KB/s.

关键词： caching inter-ISP traffic server-side load user experience

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Development of fish collagen in tissue regeneration and drug delivery

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Engineered Regeneration 2022年第3期3卷 217-231页

作者： Meison Furtado Liang chen Zehao chen ao chen Wenguo Cui Department of Orthopaedics Shanghai Key Laboratory for Prevention and Treatment of Bone and Joint DiseasesShanghai Institute of Traumatology and OrthopaedicsRuijin HospitalShanghai Jiao Tong University School of MedicineShanghai 200025P.R.China

Tissues rely on collagen for structural and biological integrity,as well as for function and *** collagen sources have been investigated due to its wide variety of applications,such as collagen from cows and ***,mammalian-based collagen has been limited by diseases like bovine spongiform encephalopathy(BSE)and other religious ***,fish collagen has caught the attention of the research community because it is easy to extract,has a high level of collagen content,excellent absorption properties,a low molecular weight,biocompatibility,little risk of disease transmission from animals to humans,negligible environmental contamination,and fewer ethical and religious concerns,posing as an ideal resource for product *** review focuses on the growing role of marine collagen in the advances of various biomedical applications,such as drug delivery,tissue engineering,regeneration,and wound healing,which will be covered in depth.

关键词： Collagen Fish collagen Marine collagen Drug delivery Tissue engineering

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Response analyses on the drill-string channel for logging while drilling telemetry

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Petroleum Science 2023年第5期20卷 2796-2808页

作者： ao-Song Zhao x.ao He Hao chen xiu-Ming Wang State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China Beijing Engineering Research Center of Sea Deep Drilling and Exploration Institute of AcousticsChinese Academy of SciencesBeijing100190China

Downhole acoustic telemetry(DAT),using a long drill string with periodical structures as the channel,is a prospective technology for improving the transmission rate of logging while drilling(LWD)*** studies only focused on the acoustic property of a free drill string and neglected the coupling between pipes and fluid-filled *** addition to the drill-string waves,a series of fluid waves are recorded in the DAT channel,which has not been investigated *** channel characteristics result in lower transmission rates and stability than ***,a more realistic channel model is needed considering the fluid-filled *** this paper,we propose a hybrid modeling method to investigate the response characteristics of the DAT *** combining the axial wavenumbers and excitation functions of mode waves in radially layered LWD structures,the channel model is approximated to the 1-D propagation,which considers transmission,reflection,and interconversion of the drillstring and fluid *** proposed 1-D approximation has been well validated by comparing the 2-D finite-difference *** is revealed that the transmitted and converted fluid waves interfere with the drill-string wave,which characterizes the DAT channel as a particular coherent multi-path *** a fluid-filled borehole surrounds the drill string,the channel responses exhibit considerable delay as well as strong frequency selectivity in amplitude and *** new findings suggest that the complexity of the channel response has been underestimated in the past,and therefore channel measurements on the ground are *** address these channel characteristics,we apply a noncoherent demodulation *** transmission rate for synthetic data reaches 15 bps in a 94.5 m long channel,indicating that the acoustic telemetry is promising to break the low-speed limitation of mud-pulse telemetry.

关键词： Logging while drilling Borehole geophysics Downhole acoustic telemetry Channel modeling Frequency selectivity

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