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Cavitation erosion behavior of CLAM steel weld joint in liquid lead-bismuth eutectic alloy

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Journal of Iron and Steel Research International 2017年第9期24卷 935-942页

作者： Yu-cheng Lei xiao-kai Guo hong-xia Chang Tian-qing Li Qiang Zhu Gang Chen Long-ren xiao School of Material Science and Engineering Jiangsu University State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology

The cavitation erosion of weld joint and base metal of China low activation martensitic（CLAM）steel in liquid lead-bismuth eutectic alloy（LBE）at 550°C was investigated to simulate the cavitation erosion of the first wall and the nuclear main pump impeller in the accelerator driven sub-critical system（ADS）.A suit of ultrasonic cavitation facility was self-designed to study the cavitation *** studying the surface micro topography,roughness and mean pit depth of the tested specimens,it was found that some crater clusters and large scale cracks appeared on the tested specimen surface after the formation of numerous single craters,and the base metal exhibited much better cavitation erosion resistance than the weld bead due to the difference in their mechanical properties and *** addition,by comparing the results of static corrosion and cavitation erosion,it could be concluded that the cavitation erosion and the dissolution and oxidation corrosion in liquid LBE would accelerate mutually.

关键词： Cavitation erosion CLAM steel Lead-bismuth eutectic alloy Weld joint Dissolution Oxidation

Hashin Failure Theory Based Damage Assessment Methodology of Composite Tidal Turbine Blades and Implications for the Blade Design

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China Ocean Engineering 2018年第2期32卷 216-225页

作者： YU Guo-qing ren Yi-ru ZHANG Tian-tian xiao Wan-shen JIANG hong-yong State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University College of Mechanical and Vehicle Engineering Hunan University Strategic Development Department China Three Gorges Corporations

A damage assessment methodology based on the Hashin failure theory for glass fiber reinforced polymer(GFRP)composite blade is proposed. The typical failure mechanisms including the fiber tension/compression and matrix tension/compression are considered to describe the damage behaviors. To give the flapwise and edgewise loading along the blade span, the Blade Element Momentum Theory(BEMT) is adopted. In conjunction with the hydrodynamic analysis, the structural analysis of the composite blade is cooperatively performed with the Hashin damage model. The damage characteristics of the composite blade, under normal and extreme operational conditions,are comparatively analyzed. Numerical results demonstrate that the matrix tension damage is the most significant failure mode which occurs in the mid-span of the blade. The blade internal configurations including the box-beam, Ibeam, left-C beam and right-C beam are compared and analyzed. The GFRP and carbon fiber reinforced polymer(CFRP) are considered and combined. Numerical results show that the I-beam is the best structural type. The structural performance of composite tidal turbine blades could be improved by combining the GFRP and CFRP structure considering the damage and cost-effectiveness synthetically.

关键词： composites tidal current turbine blade damage assessment tidal energy Hashin failure theory blade design

TaxonKit:A practical and efficient NCBI taxonomy toolkit

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Journal of Genetics and Genomics 2021年第9期48卷 844-850页

作者： Wei Shen hong ren Institute for Viral Hepatitis Department of Infectious DiseasesKey Laboratory of Molecular Biology for Infectious DiseasesMinistry of EducationThe Second Affiliated Hospital of Chongqing Medical UniversityChongqing 400010China

The National Center for Biotechnology Information(NCBI)Taxonomy is widely applied in biomedical and ecological *** demands include querying taxonomy identifier(TaxIds)by taxonomy names,querying complete taxonomic lineages by TaxIds,listing descendants of given TaxIds,and ***,existed tools are either limited in functionalities or inefficient in terms of *** this work,we present TaxonKit,a command-line toolkit for comprehensive and efficient manipulation of NCBI Taxonomy *** comprises seven core subcommands providing functions,including TaxIds querying,listing,filtering,lineage retrieving and reformatting,lowest common ancestor computation,and TaxIds change *** practical functions,competitive processing performance,scalability with different scales of datasets and good accessibility can facilitate taxonomy data *** provides free access under the permissive MIT license on GitHub,Brewsci,and *** documents are also available at https://***/taxonkit/.

关键词： NCBI Taxonomy TaxonKit TaxId Lineage TaxId changelog

Comparative study of different membranes as separators for rechargeable lithium-ion batteries

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International Journal of Minerals,Metallurgy and Materials 2013年第6期20卷 598-603页

作者： hong-yan Guan Fang Lian Yan ren Yan Wen xiao-rong Pan Jia-lin Sun School of Materials Science and Engineering University of Science and Technology Beijing

Membranes of polypropylene （PP）, PP coated with nano-A1203, PP electrospun with polyvinylidene fluoride- hexafluoropropylene （PVdF-HFP）, and trilayer laminates of polypropylene-polyethylene-polypropylene （PP/PE/PP） were comparatively studied. Their physical properties were characterized by means of thermal shrinkage test, liquid electrolyte uptake, and field emission scanning electron microscopy （FESEM）. Results show that, for the different membranes as PP, PP coated with nanowA1203, PP electrospun with PVdF-HFP, and PP/PE/PP, the thermal shrinkages are 14%, 6%, 12.6%, and 13.3%, while the liquid electrolyte uptakes are 110%, 150%, 217%, and 129%, respectively. In addition, the effects on the performance of lithium-ion batteries （LiFePO4 and LiNil/3Col/3Mn1/302 as the cathode material） were investigated by AC impedance and galvanostatic charge/discharge test. It is found that PP coated with A1203 and PP electrospun with PVdF-HFP can effectively increase the wettability between the cathode material and liquid electrolyte, and therefore reduce the charge transfer resistance, which improves the capacity retention and battery performance.

关键词： lithium-ion batteries membranes separators thermal stability electrochemical properties

Quasi-attractors in a Piece-Wise Smooth Area-Preserving Map

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Chinese Physics Letters 2001年第1期18卷 13-15页

作者： WANG Jian DING xiao-Ling WANG Bing-hong HE Da-ren Institute of Plasma Physics Chinese Academy of SciencesHefei 230031 Complexity Science Center Yangzhou UniversityYangzhou 225002 CCAST(World Laboratory) P.O.Box 8730Beijin100080 Department of Modern Physics University of Science and Technology ofChinaHefei 230026

In a two-dimensional area-preserving map we found a kind of noninvertibility that is induced by a piece-wise smooth property of the *** can lead to the appearance of such kinds of elliptic islands that attract the iterations from a set of initial values outside themselves,while behaving regularly *** suggest calling such islands quasi-attractors.

关键词： preserving outside elliptic

Effects of sepsis and its treatment measures on intestinal flora structure in critical care patients

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World Journal of Gastroenterology 2021年第19期27卷 2376-2393页

作者： xiao-Juan Yang Dan Liu hong-Yan ren xiao-Ya Zhang Jun Zhang xiao-Jun Yang Department of Critical Care Medicine General Hospital of Ningxia Medical UniversityYinchuan 750004Ningxia Hui Autonomous RegionChina Department of Critical Care Medicine Taihe HospitalHubei University of MedicineShiyan 442000Hubei ProvinceChina Shanghai Mobio Biomedical Technology Co. Shanghai 201318China

BACKGROUND Sepsis is a common disease in intensive care units,with high morbidity and *** microecology plays a vital part in the development and progression of this disease,possibly because sepsis and its treatment cause specific changes in the composition of the intestinal *** To investigate the characteristics of intestinal flora disturbance in sepsis patients treated with *** In this prospective comparative study,we enrolled ten patients with sepsis(sepsis group),hospitalized in the Department of Critical Care Medicine of the General Hospital,Ningxia Medical University,China(a class IIIa general hospital)from February 2017 to June 2017;ten patients without sepsis hospitalized in the same period(non-sepsis group)and ten healthy individuals(control group)were also *** samples collected from the three groups were subjected to 16S rRNA gene sequencing and the intestinal flora diversity,structure,and composition were ***,the dynamics of the intestinal flora diversity,structure,and composition in sepsis patients were investigated via 16S rRNA gene sequencing of samples collected 0 d,3 d,and 7 d after admittance to the intensive care *** between the serum levels of procalcitonin,endotoxin,diamine oxidase,and D-lactic acid and the intestinal flora composition of sepsis patients were also *** Compared with the healthy control group,sepsis and non-sepsis patients showed reduced intestinal floraα-diversity and a distinct flora structure,with Firmicutes as the dominant phylum,and significantly decreased proportions of Bacteroidetes,as well as Prevotella and Lachnospira,among other *** note,the proportion of Enterococcus was significantly increased in the intestinal tract of sepsis ***,theα-diversity in the sepsis group decreased gradually,from days 1 to 7 of ***,pairwise comparisons showed that both the diversity and structure of the int

关键词： Sepsis Intestinal flora 16S rRNA gene sequencing Dynamic changes Intestinal barrier index Procalcitonin

Recirculation of Parallel-Connected Planetary Gear Trains

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Chinese Journal of Mechanical Engineering 2022年第2期35卷 100-110页

作者： hong Chen xiao-An Chen School of Mechanical Engineering Xihua UniversityChengdu 610039SichuanChina The State Key Laboratory of Mechanical Transmissions Chongqing UniversityChongqing 400044China

Recirculation is expected to be identified for its possibility to dramatically decrease the efficiency of planetary gear trains(PGTs).However,it exhibits an unexplained connection with the structure,making it challenging to identify without tedious computation through tooth and speed ratios,thus complicating the design *** study employs a generic model utilizing the mechanical balance principle and reveals the fundamental laws of the previously unexplained connection for parallel-connected ring-sun-type *** necessary and sufficient conditions,torque and structure,were proven for multi-stage and two-stage PGTs without recirculation,*** shows that the structure,specifically whether the links are central gears or carriers,and the connections between them directly impact the recirculation of these PGTs.A geometric model representing the structure and kinematics was developed to visualize the power ***,the recirculation of parallel-connected ring-sun-type PGTs can be predicted without *** results provide the underlying insights to understanding recirculation from the structural connection viewpoint,thereby contributing to the conceptual design phase where the task is to select the kinematic structure and the gear size is unknown.

关键词： Power flow Generic three-terminal Torque direction Multistage PGTs

Effects of mindful breathing combined with sleep-inducing exercises in patients with insomnia

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World Journal of Clinical Cases 2021年第29期9卷 8740-8748页

作者： Hui Su Li xiao Yue ren Hui Xie Xiang-hong Sun Sleep Medicine Center Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina

BACKGROUND Insomnia is the most common sleep *** disrupts the patient’s life and work,increases the risk of various health issues,and often requires long-term *** financial burden and inconvenience of treatments discourage patients from complying with them,leading to chronic *** To investigate the long-term home-practice effects of mindful breathing combined with a sleep-inducing exercise as adjunctive insomnia *** A quasi-experimental design was used in the present work,in which the patients with insomnia were included and grouped based on hospital admission:40 patients admitted between January and April 2020 were assigned to the control group,and 40 patients admitted between May and August 2020 were assigned to the treatment *** control group received routine pharmacological and physical therapies,while the treatment group received instruction in mindful breathing and a sleep-inducing exercise in addition to the routine *** Pittsburgh Sleep Quality Index(PSQI),Generalized Anxiety Disorder 7-item(GAD-7)scale,and Insomnia Severity Index(ISI)were utilized to assess sleepquality improvement in the patient groups before the intervention and at 1 wk,1 mo,and 3 mo *** The PSQI,GAD-7,and ISI scores before the intervention and at 1 wk postintervention were not significantly different between the ***,compared with the control group,the treatment group exhibited significant improvements in sleep quality,daytime functioning,negative emotions,sleep latency,sleep duration,sleep efficiency,anxiety level,and insomnia severity at 1 and 3 mo postintervention(P<0.05).The results showed that mindful breathing combined with the sleep-inducing exercise significantly improved the long-term effectiveness of insomnia *** 3 mo,the PSQI scores for the treatment vs the control group were as follows:Sleep quality 0.98±0.48 vs 1.60±0.63,sleep latency 1.98±0.53 vs 2.80±0.41,sleep duration 1.53±0.6

关键词： Mindful breathing Sleep-inducing exercise Insomnia Treatment effectiveness Psychotherapy

Mass transport induced structural evolution and healing of sulfur vacancy lines and Mo chain in monolayer MoS_(2)

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Rare Metals 2022年第1期41卷 333-341页

作者： xiao-Wei Wang Lin-Fang Hou Wei Huang Xi-Biao ren Wei Ji Chuan-hong Jin State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Department of Physics Beijing Key Laboratory of Optoelectronic Functional Materials and Micro-Nano DevicesRenmin University of ChinaBeijing 100872China Hunan Institute of Advanced Sensing and Information Technology Xiangtan UniversityXiangtan 411105China

Defects play vital roles in tailoring structures and properties of materials including the atomically thin two-dimensional(2D)materials,and increasing demands are requested to find effective ways to realize the defect engineering,i.e.,tuning the defects and thus the materials’structure–property in a well-controlled ***,we propose a novel method to tune the structures and configurations of one-dimensional(1D)line defects in monolayer MoS2 via mass transport induced structural *** using atomic-resolved annular dark-field scanning transmission electron microscopy(ADF-STEM),we demonstrate in situ that sulfur vacancy line defect can be healed locally into defect-free MoS_(2)lattice via the desorption of Mo atoms from vacancy lines and adsorption into a moving Mo ***,directional transport of Mo atoms(or Mo cluster)along the sulfur vacancy lines can induce the formation of Mo *** a mass transport induced defect tuning provides more operational routes for the rational defect designing and property tuning in MoS_(2)as well as other related 2D materials.

关键词： MoS_(2) Defect engineering In situ transmission electron microscopy(TEM) Mass transport Line defect