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Microstructural refinement and enhanced mechanical properties of suction-cast NiTi-Al alloy for structural use

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Rare Metals 2022年第8期41卷 2739-2744页

作者： Li-Jing Zheng Ling Guo fang-fang wang Ming-Zhen Ma Hu Zhang Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education School of Materials Science and EngineeringBeihang UniversityBeijing100191China School of Materials Science and Engineering Yanshan UniversityQinhuangdao066004China

A significant refinement of the microstructure of structural NiTi alloy was achieved through a combination of Al addition and fabrication by suction casting.This is attributed to the change from a layer-by-layer to volume solidification mode with Al content increasing,which causes a change in grain shape from columnar to equiaxed.Furthermore,when compared with conventional casting,suction casting optimizes the microstructure of the alloy by refining the grain size and ensuring a homogeneous distribution of Ti2 Ni and Ni_(2)TiAl phases.The high cooling rate of suction casting also delays the formation ofβ'-Ni_(2)TiAl phase.Finally,this fine microstructure and uniform distribution of intermetallic phases result in the ultimate compressive strength of up to 2463.7 MPa,representing an improvement of 370 MPa over conventionally cast NiTi-Al alloy.

关键词： NiTi-Al intermetallic compound Suction casting Microstructure Compressive strength

Yellow nail syndrome accompanied by minimal-change nephrotic syndrome:A case report

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World Journal of Clinical Cases 2022年第15期10卷 4949-4956页

作者： Ya-Nan Zhang Mei-Hua wang Wen-Cheng Yu Wei Cheng Jin-Peng Cong Xue-Peng Huang fang-fang wang Department of Respiratory and Critical Care Medicine The Affiliated Hospital of Qingdao UniversityQingdao 266000Shandong ProvinceChina Department of Respiratory and Critical Care Medicine People's Hospital of Rizhao LanshanRizhao 276800Shandong ProvinceChina

BACKGROUND In most cases of yellow nail syndrome(YNS),the classic triad of yellow nails,lymphedema and respiratory manifestations rarely manifest simultaneously.Therefore,diagnosis is delayed or frequently missed.CASE SUMMARY We report a 62-year-old YNS patient presenting with bilateral pleural,pericardial and peritoneal effusions who,2 mo later,developed minimal-change nephrotic syndrome.After treatment with vitamin E,clarithromycin and prednisone for 3 mo,effusions in the chest,pericardium and abdominal cavity decreased while urine protein levels returned to within normal ranges.CONCLUSION Clinicians should consider the possibility of YNS for patients presenting with multiple serous effusions and nephrotic syndromes.

关键词： Yellow nail syndrome Pleural effusion Pericardial effusion Peritoneal effusion Nephrotic syndrome Case report

Ambiently fostering solid electrolyte interphase for low-temperature lithium metal batteries

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Journal of Energy Chemistry 2023年第12期87卷 473-478,I0012页

作者： Jia-Yue Duan Jin-Xiu Chen fang-fang wang Jin-Hao Zhang Xiao-Zhong Fan Liping wang Yingze Song Wei Xia Yusheng Zhao Long Kong Frontiers Science Center for Flexible Electronics and Xi’an Institute of Flexible Electronics(IFE) Northwestern Polytechnical UniversityXi’an 710129ShaanxiChina Department of Physics Academy for Advanced Interdisciplinary StudiesSouthern University of Science and TechnologyShenzhen 518055GuangdongChina State Key Laboratory of Environment-Friendly Energy Materials School of Materials Science and EngineeringGraphene Joint Innovation CentreSouthwest University of Science and TechnologyMianyang 621010SichuanChina Eastern Institute for Advanced Study Eastern Institute of TechnologyNingbo 315201ZhejiangChina

Despite being a leading candidate to meet stringent energy targets,lithium(Li) metal batteries(LMBs)face severe challenges at low temperatures such as dramatic increase in impedance,capacity loss and dendrite growth.Unambiguously fingerprinting rate-limited factors of low-temperature LMBs would encourage targeted approaches to promote performances.Herein,the charge transfer impedance across solid electrolyte interphase(SEI) is identified to restrict battery operation under low temperature,and we propose a facile approach on the basis of ambiently fostering SEI(af-SEI) to facilitate charge transfer.The concept of af-SEI stems from kinetic benefits and structural merits to construct SEI at ambient temperature over low temperature developed SEI that is temporally consuming to achieve steady state and that is structurally defective to incur dendrite growth.The af-SEI allows ionically conductive and morphologically uniform layer on the anode surface,which exhibits a lower resistance and induces an even deposition of Li in the subsequent low temperature battery operation.Armed with af-SEI,the LMBs deliver the improved rate performance and prolonged cycle life when subjected to low temperature cycling.This work unveils the underlying causes that limit low temperature LMB performances,and enlightens the facile test protocols to build up favorable SEI,beyond scope of material and morphology design.

关键词： Li matel batteries Ambiently fostering SEI Charge transfer impedance Low temperature kinetics

Flow structure and unsteady fluctuation with separation over a two-dimensional backward-facing step

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Journal of Hydrodynamics 2019年第6期31卷 1204-1217页

作者： fang-fang wang Shi-qiang Wu Biao Huang State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing Hydraulic Research InstituteNanjing 210029China Smart Cities Institute Zhengzhou UniversityZhengzhou 450001China

The flow over a backward-facing step(BFS)is a typical separation and reattachment flow.Its flow structures and unsteady mechanisms are still not well explored.In this paper,the global velocity fields of a BFS are obtained by a synchronous particle image velocimetry(PIV)system with Reh=5345(Reynolds number)and Er=2(expansion ratio).Flow structures are distinguished and defined by the fraction of the negative velocity(upn).The reattachment zone(Lr)is quantitatively defined as(u0.9,u/0.1)on the bottom wall.Spatial distribution of the large-scale vortices couples well with the divided flow structures and their temporal evolution presenting four stages(forming,developing,shedding and redeveloping)when travel downstream.The unsteady motions with various low frequencies are well explained by the coherent vortices and flow structures.Among the unsteady low frequency motions,the Kelvin Helmholtz(KH)vortices and the oscillation of Xr(OX)come likely from the free shear layer.The KH vortices contribute to the unsteadiness of the temporal flow,and the OX is the primary response to the vortical fluctuations.

关键词： Backward-facing step flow structure large-scale vortices unsteady motion free shear layer

Numerical simulation of flow separation over a backward-facing step with high Reynolds number

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Water Science and Engineering 2019年第2期12卷 145-154页

作者： fang-fang wang Shi-qiang Wu Sen-lin Zhu State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing Hydraulic Research Institute

Large eddy simulation (LES) explicitly calculates the large-scale vortex field and parameterizes the small-scale vortices.In this study,LES and κ-ε models were developed for a specific geometrical configuration of backward-facing step (BFS).The simulation results were validated with particle image velocimetry (PIV) measurements and direct numerical simulation (DNS).This LES simulation was carried out with a Reynolds number of 9000 in a pressurized water tunnel with an expansion ratio of 2.00.The results indicate that the LES model can reveal largescale vortex motion although with a larger grid-cell size.However,the LES model tends to overestimate the top wall separation and the Reynolds stress components for the BFS flow simulation without a sufficiently fine grid.Overall,LES is a potential tool for simulating separated flow controlled by large-scale vortices.

关键词： Large eddy simulation κ-ε model Backward-facing step Direct numerical simulation Large-scale vortices Particle image velocimetry

Phytochrome B Is Involved in Mediating Red Light-Induced Stomatal Opening in Arabidopsis thaliana

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Molecular Plant 2010年第1期3卷 246-259页

作者： fang-fang wang Hong-Li Lian Chun-Ying Kang Hong-Quan Yang National Key Laboratory of Plant Molecular Genetics Institute of Plant Physiology and Ecology Shanghai Institutes for Biological Sciences Chinese Academyof Sciences 300 Fenglin Road Shanghai 200032 China School of Agricultural and Biological Sciences Shanghai Jiaotong University 800 Dongchuan Road Shanghai 200240 China

The stomatal pores of higher plants enable gaseous exchange into and out of leaves for photosynthesis and evaporation. Stomatal opening is induced by both blue and red lights. It is shown that blue light-induced stomatal opening is mediated by the blue light receptor phototropins （PHOT1 and PHOT2） and cryptochromes （CRY1 and CRY2）. However, whether phytochrome B （phyB） is involved in red light regulation of stomatal opening remains largely unclear. Here, we report a positive role for Arabidopsis （Arabidopsis thaliana） phyB in the regulation of red light-induced stomatal opening. The phyB mutant stomata displayed a reduced red light response, whereas stomata of the phyB-overexpressing plants displayed a hypersensitive response to red light. In addition, stomata of the cry1 cry2 phyB, photl phot2 phyB, and cry1 phyA phyB triple mutant plants showed more reduced light response than those of the single or double mutant plants under white light, implying that phyB acts in concert with phyA, CRY, and PHOT in light regulation of stomatal opening. Stomata of phyB cop1 mutant opened less wide than those of the cop1 mutant, and stomata of the pif3 pif4 mutant opened wider than those of the wild-type, indicating that COP1, together with the PIFs （phytochrome interacting factors）, may act downstream of PHYB in regulating stomatal opening. Furthermore, quantitative RT-PCR analysis showed that the expression of MYB60 was reduced in the cry1 cry2 and phyA phyB mutants under blue and red lights, respectively, but induced in the CRY1- and phyB-overexpressing plants. These results demonstrate that phyB and CRY might regulate stomatal opening, at least in part, by regulating MYB60 expression.

关键词： Arabidopsis phyB stomatal opening red light.

Cerebral palsy in children born after assisted reproductive technology: a meta-analysis

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World Journal of Pediatrics 2021年第4期17卷 364-374页

作者： fang-fang wang Tao Yu Xiao-Lu Chen Rong Luo De-Zhi Mu Department of Pediatrics The First Affiliated Hospital of Zhengzhou UniversityZhengzhouChina Department of Pediatrics West China Second University HospitalSichuan University20 South Renmin Road 3rd SectionWuhou DistrictChengdu 610041China Key Laboratory of Obstetric and Gynecologic and Pediatric Diseases and Birth Defects of Ministry of Education Sichuan UniversityChengduChina

Background Several studies have assessed the association between cerebral palsy(CP)and assisted reproductive technology(ART),but the results remain controversial.We conducted a meta-analysis to evaluate the risk of CP after ART compared with natural conceptions and to examine CP risk separately in ART singletons,multiples and preterm births.Methods Web-based databases(PubMed,Embase,the Cochrane Library,and Web of Science)were searched until November 22,2020.Studies which compare CP rates after ART with natural conceptions were included.The Newcastle–Ottawa Scale was used to assess the quality of the included studies.Effect estimates were extracted and combined using the fixed-effects or random-effects model depending on the heterogeneity test.Results There were nine studies included in the meta-analysis.The included studies were of moderate or high quality.A significantly higher risk of CP[odds ratio(OR)=2.17,95%confidence interval(CI)1.72–2.74]was found in ART children(n=89,214)compared with naturally conceived children(n=4,160,745).The significantly higher risk decreased when data were restricted to singletons(OR=1.36,95%CI 1.16–1.59)and disappeared when data were restricted to multiples(OR=1.05,95%CI 0.86–1.29)or preterm births(OR=1.53,95%CI 0.66–3.56).Subgroup and sensitivity analyses indicated that the overall results were robust.Conclusions The risk of CP is increased more than two-fold after ART.This increased risk is largely due to increased rates of multiple birth and preterm delivery in ART children.

关键词： Assisted reproductive technology Cerebral palsy Meta-analysis

Spindle LiFePO_4 particles as cathode of lithium-ion batteries synthesized by solvothermal method with glucose as auxiliary reductant

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Rare Metals 2015年第10期34卷 731-737页

作者： Li Ren Xing-En Li fang-fang wang Yang Han Polymer Research Institute College of Chemical EngineeringHebei University of Technology

The well-distribution spindle Li Fe PO4(LFP)nanoparticles as cathode of lithium secondary batteries were synthesized by a solvothermal reaction route at low temperature(180 °C) in which the ascorbic acid was used as reducing agent. In order to guarantee that the p H values of thermal systems were not affected too much and the reducibility of the system was enhanced at the same time,glucose was chosen as an auxiliary reductant in this reaction. The obtained powders were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM),and laser particle analyzer. The results show that the carbon-coated uniform spindle olivine Li Fe PO4/C-glucose particles(glucose as auxiliary reductant, LFP/C-G) are prepared with the size 500–600 nm and without any impurity phases. Their electrochemical properties were evaluated by electrochemical impedance spectroscopy,cyclic voltammetry, and galvanostatic charge/discharge tests. LFP/C-G has a higher conductivity and better reversible capability than carbon-coated LFP(LFP/C). The highest discharge capacity of LFP/C-G is 161.3 mAh·g-1at0.1C and 108.6 mAh·g-1at 5.0C, respectively. The results imply that the neat crystal nanostructure of LFP/C-G has excellent capacity retention and cycling stability.The adding of glucose is the key factor for the welldistribution and neat crystal structure of nanoparticles,thus the electrochemical performances of materials are improved.

关键词： Lithium-ion battery LiFePO4 Spindle Solvothermal G

Evolution of carbides on surface of carburized MSONiL bearing steel

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Journal of Iron and Steel Research(International) 2018年第11期25卷 1198-1211页

作者： Jiang-long Lian Li-jing Zheng fang-fang wang Hu Zhang School of Materials Science and Engineering Beihang UniversityBeijing 100191China

The dissolution and precipitation behaviors of the carbides in carburized M50NiL steel were derived from different solution and tempering treatments.Totally four kinds of carbides of (V,Cr)-rich MC,(Mo,Fe)-rich M2C,Fe-rich M3C and (Fe,Cr)-rich M7C3 were obtained from the carburized M50NiL steel after different heat treatments.The key carbides of carbufized M50NiL steel were proved to be tough V-rich MC and Cr-rich M7C3.The highest hardness (634 HV)and the optimal surface structure with 1.0% volume fraction of uniformly distributed MC carbides were obtained after the carbufized M50NiL steel was solution-treated at 1150 ℃ and tempered at 500 ℃.The quantitative statistics show that 63%of the MC carbides were less than 200 nm under that heat treatment.The variety of carbides changed with solution and tempering conditions.When the solution temperature increased from 1050 to 1150 ℃,the undissolved carbides were proved to be Fe-rich M7C3,Mo-fich MC and (Mo,Fe)-fich M2C.Besides,the equivalent content of V-rich MC was found increased when the tempering temperature changed from 500 to 550 ℃.The combination of high-temperature solution and low-temperature tempering is recommendable heat treatment for the high hardness as well as the tiny and uniformly distributed carbides.

关键词： M50NiL steel Carbide Carburization Hardness Heat treatment