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极地双向破冰船破冰能力评估分析

舰船科学技术 2024年第9期46卷 1-6页

作者：刁峰徐伟唐旭姚凤翔中国船舶科学研究中心江苏无锡214082 深海技术科学太湖实验室连云港中心江苏连云港222000

破冰能力是衡量极地船舶航行性能优劣的重要指标。本文在基于预设冰网格技术的连续破冰阻力数值模拟理论基础上,根据连续破冰阻力与净推力的不同平衡方式提出静态和动态2种极地船舶破冰能力数值评估方法。以某极地双向破冰油船为研究对... 详细信息

破冰能力是衡量极地船舶航行性能优劣的重要指标。本文在基于预设冰网格技术的连续破冰阻力数值模拟理论基础上,根据连续破冰阻力与净推力的不同平衡方式提出静态和动态2种极地船舶破冰能力数值评估方法。以某极地双向破冰油船为研究对象,分别采用静态和动态方法对其破冰能力进行数值评估,并与对应的冰水池模型试验结果进行对比分析。结果表明,静态和动态破冰能力评估方法获得的1kn航速对应的最大破冰厚度与模型试验结果较为吻合,2种方法评估结果均显示极地油船首向破冰能力强于尾向破冰能力,与实际情况相符,验证了2种破冰能力评估方法的可行性,可为极地船舶初始设计阶段性能预估提供有效工具。

关键词：双向破冰预设网格破冰能力静态评估动态评估

Prediction of added resistance of a ship in waves at low speed

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Journal of Hydrodynamics 2019年第6期31卷 1231-1239页

作者： feng diao Ji-kang Chen Wen-yang Duan Wei-xin Zhou Jingpu Chen Jin-fang Wei China Ship Scientific Research Center Wuxi 214082China College of Shipbuilding Engineering Harbin Engineering UniversityHarbin 150001China

This paper presents predictions of the added resistance of a ship in waves at a low speed according to the IMO minimum propulsion power requirement by a hybrid Taylor expansion boundary element method(TEBEM).The flow domain is divided into two parts:the inner domain and the outer domain.The first-order TEBEM with a simple Green function is used for the solution in the inner domain and the zero order TEBEM with a transient free surface Green function is used for the solution in the outer domain.The TEBEM is applied in the numerical prediction of the motions and the added resistance in waves for three new designed commercial ships.The numerical results are compared with those obtained from the seakeeping model tests.It is shown that the prediction of the ship motions and the added resistance in waves are in good agreement with the experimental results.The comparison also indicates that the accuracy of the motion estimation is crucial for the prediction of the wave added resistance.In general,the TEBEM enjoys a satisfactory accuracy and efficiency to predict the added resistance in waves at a low speed according to the IMO minimum propulsion power requirement.

关键词： Taylor expansion boundary element method(TEBEM) added resistance in waves low speed minimum propulsion power

Meta分析丛枝菌根真菌对草莓生长与果实特性的影响

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微生物学杂志 2024年第1期44卷 77-83页

作者：刁风伟张纪涛温云杰史向远周静王秀红山西农业大学山西有机旱作农业研究院山西太原030031

丛枝菌根(Arbuscular mycorrhizal,AM)真菌通常具有促进植物生长,提高植物抗逆性的功能。然而AM真菌是否无论草莓生境如何,都一致性地调控草莓表型和果实特性仍未明确。本研究利用荟萃分析(Meta-analysis)方法,整合分析了AM真菌对草莓... 详细信息

丛枝菌根(Arbuscular mycorrhizal,AM)真菌通常具有促进植物生长,提高植物抗逆性的功能。然而AM真菌是否无论草莓生境如何,都一致性地调控草莓表型和果实特性仍未明确。本研究利用荟萃分析(Meta-analysis)方法,整合分析了AM真菌对草莓植株干重、根系结构、氮(N)和磷(P)含量、果实产量及特性的影响。结果表明,AM真菌能够显著增加草莓植株地上部和根部干重,促进草莓根系伸长和根表面积增加,调整草莓根系结构;显著增加了草莓植株地上部和根部N、P含量。其中摩西管柄囊霉(Funneliformis mosseae)能够促进草莓N、P吸收,增加植株生物量。AM真菌不仅提高草莓的果实数量和总产量,还能够促进果实中总花青素、总酚、黄酮类物质和抗坏血酸的积累,从而提高果实的抗氧化特性,而总可溶性固体(TSS)、可滴定酸度(TA)和TSS/TA比值未受到显著影响。本研究表明,AM真菌有利于促进草莓植株生长和果实增产,并且能够提高果实中抗氧化物质的含量,具有应用到草莓绿色生产中的潜力。

关键词：丛枝菌根真菌草莓生长特性果实特性 Meta分析

Excited state biexcitons in monolayer WSe_(2)driven by vertically grown graphene nanosheets with high-density electron trapping edges

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Frontiers of physics 2023年第3期18卷 103-112页

作者： Bo Wen Da-Ning Luo Ling-Long Zhang Xiao-Lin Li Xin Wang Liang-Liang Huang Xi Zhang Dong-feng diao Institute of Nanosurface Science and Engineering Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering Shenzhen UniversityShenzhen 518060China College of Physics Nanjing University of Aeronautics and AstronauticsKey Laboratory of Aerospace Information Materials and Physics(NUAA)MIITNanjing 211106China Research Center of Medical Plasma Technology Shenzhen UniversityShenzhen 518060China

Interface engineering in atomically thin transition metal dichalcogenides(TMDs)is becoming an important and powerful technique to alter their properties,enabling new optoelectronic applications and quantum devices.Interface engineering in a monolayer WSe_(2)sample via introduction of high-density edges of standing structured graphene nanosheets(GNs)is realized.A strong photoluminescence(PL)emission peak from intravalley and intervalley trions at about 750 nm is observed at the room temperature,which indicated the heavily p-type doping of the monolayer WSe_(2)/thin graphene nanosheet-embedded carbon(TGNEC)film heterostructure.We also successfully triggered the emission of biexcitons(excited state biexciton)in a monolayer WSe_(2),via the electron trapping centers of edge quantum wells of a TGNEC film.The PL emission of a monolayer WSe_(2)/GNEC film is quenched by capturing the photoexcited electrons to reduce the electron-hole recombination rate.This study can be an important benchmark for the extensive understanding of light–matter interaction in TMDs,and their dynamics.

关键词： excited state biexcitons monolayer WSe_(2) vertically graphene electron trapping edges

Emulsifying property,antioxidant activity,and bitterness of soybean protein isolate hydrolysate obtained by Corolase PP under high hydrostatic pressure

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Food Science and Human Wellness 2024年第3期13卷 1271-1278页

作者： Haining Guan Chunmei feng Min Ren Xiaojun Xu Dengyong Liu Xiaoqin diao College of Food Science and Technology Bohai UniversityJinzhou 121013China

Enzymatic hydrolysis of proteins can enhance their emulsifying properties and antioxidant activities.However,the problem related to the hydrolysis of proteins was the generation of the bitter taste.Recently,high hydrostatic pressure(HHP)treatment has attracted much interest and has been used in several studies on protein modification.Hence,the study aimed to investigate the effects of enzymatic hydrolysis by Corolase PP under different pressure treatments(0.1,100,200,and 300 MPa for 1-5 h at 50℃)on the emulsifying property,antioxidant activity,and bitterness of soybean protein isolate hydrolysate(SPIH).As observed,the hydrolysate obtained at 200 MPa for 4 h had the highest emulsifying activity index(47.49 m^(2)/g)and emulsifying stability index(92.98%),and it had higher antioxidant activities(44.77%DPPH free radical scavenging activity,31.12%superoxide anion radical scavenging activity,and 61.50%copper ion chelating activity).At the same time,the enhancement of emulsion stability was related to the increase of zeta potential and the decrease of mean particle size.In addition,the hydrolysate obtained at 200 MPa for 4 h had a lower bitterness value and showed better palatability.This study has a broad application prospect in developing food ingredients and healthy foods.

关键词： Soybean protein isolate High hydrostatic pressure Emulsification Antioxidant Bitter taste

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根际细菌对番茄幼苗生长的影响

安徽农业科学 2024年第11期52卷 32-35,42页

作者：刁风伟黄琰哲许子荣王保平周静王秀红山西农业大学山西有机旱作农业研究院/农业农村部有机旱作农业重点实验室(部省共建) 山西太原030031

利用阿须贝氏无氮培养基在番茄根际土中筛选到5株细菌菌株,鉴定菌株生物学分类;然后以番茄为供试植物,分别添加5株菌株菌液为处理,研究根际细菌对番茄幼苗生长和根系结构的影响。结果显示,5株菌株均显著降低了番茄幼苗的株高和SPAD值。... 详细信息

利用阿须贝氏无氮培养基在番茄根际土中筛选到5株细菌菌株,鉴定菌株生物学分类;然后以番茄为供试植物,分别添加5株菌株菌液为处理,研究根际细菌对番茄幼苗生长和根系结构的影响。结果显示,5株菌株均显著降低了番茄幼苗的株高和SPAD值。FN2和FN6菌株显著降低了植物的干重、鲜重和地上部的投影面积。FN6菌株还降低了植物的根总表面积和根总体积。5株菌株都未呈现出正向促进效应。该研究为开发根际细菌存在的潜在风险提供警惕。

关键词：根际细菌番茄根系结构抑制生长

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Bending fatigue behavior of thin Zr_(61)Ti_(2)Cu_(25)Al_(12)bulk metallic glass beams for compliant mechanisms application

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Journal of Materials Science & Technology 2021年第30期89卷 1-15页

作者： diao-feng Li Ya-Long Yang Yong Shen Jian Xu Institute of Metal Research Chinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China

In this work,bending fatigue behavior of thinner Zr_(61)Ti_(2)Cu_(25)Al_(12)(ZT1)BMG beams with thicknesses of 500μm and 100μm were investigated with three-point bending(3PB),to evaluate the reliability and safety of this potentially material used in compliant mechanisms under cyclic bending load.Fatigue endurance limits(FELs)of ZT1 beams with thicknesses of 500μm and 100μm were determined to be 470 MPa,and~0.3 of its tensile strength.Fatigue life and FEL of ZT1 beams in bending are substantially independent of the beam thickness,in the scale from 500μm down to 100μm.Fatigue cracks of all ZT1 beams initiated at the extrinsic microvoids,either indirectly derived from surface scratches during mechanical polishing or originated from as-cast process.However,fatigue crack propagation behavior is highly related to the magnitude of cyclic stress level.By interrupted fatigue tests,larger proportion about 60-70%of fatigue life was spent on crack propagation under high stress level,while crack initiation occupied larger proportion about 80-85%under low stress level.The medium stress level of about 590 MPa almost shared the crack-initiation life and crack-propagation life.In addition,there are two crack deflection mechanisms during cracks steady propagation stage.One mechanism is crack deflection along the interacted shear bands ahead of crack-tip,the other one is crack"jump"from one shear band to another shear band at a certain angle.These two mechanisms alternate dominate the crack propagation process,generating typical staircase-like crack propagation trajectory.Fatigue endurance limits of ZT1 beams in the form of either stress amplitude or strain amplitude are superior to traditional candidate materials in the field of compliant mechanisms,showing that the better reliability and larger deflection deformation can be achieved for flexible members made by ZT1 BMG even under cyclic loading.

关键词： Metallic glasses Bending fatigue Crack initiation Crack propagation Compliant mechanisms

m^(6)A reader YTHDF1 promotes cardiac fibrosis by enhancing AXL translation

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Frontiers of Medicine 2024年第3期18卷 499-515页

作者： Han Wu Weitao Jiang Ping Pang Wei Si Xue Kong Xinyue Zhang Yuting Xiong Chunlei Wang feng Zhang Jinglun Song Yang Yang Linghua Zeng Kuiwu Liu Yingqiong Jia Zhuo Wang Jiaming Ju Hongtao diao Yu Bian Baofeng Yang Department of Pharmacology(National Key Laboratory of Frigid Zone Cardiovascular Diseases the State-Province Key Laboratories of Biomedicine-Pharmaceutics of ChinaKey Laboratory of Cardiovascular ResearchMinistry of Education)College of PharmacyHarbin Medical UniversityHarbin150081China

Cardiac fibrosis caused by ventricular remodeling and dysfunction such as post-myocardial infarction(MI)can lead to heart failure.RNA N6-methyladenosine(m^(6)A)methylation has been shown to play a pivotal role in the occurrence and development of many illnesses.In investigating the biological function of the m^(6)A reader YTHDF1 in cardiac fibrosis,adeno-associated virus 9 was used to knock down or overexpress the YTHDF1 gene in mouse hearts,and MI surgery in vivo and transforming growth factor-β(TGF-β)-activated cardiac fibroblasts in vitro were performed to establish fibrosis models.Our results demonstrated that silencing YTHDF1 in mouse hearts can significantly restore impaired cardiac function and attenuate myocardial fibrosis,whereas YTHDF1 overexpression could further enhance cardiac dysfunction and aggravate the occurrence of ventricular pathological remodeling and fibrotic development.Mechanistically,zinc finger BED-type containing 6 mediated the transcriptional function of the YTHDF1 gene promoter.YTHDF1 augmented AXL translation and activated the TGF-β-Smad2/3 signaling pathway,thereby aggravating the occurrence and development of cardiac dysfunction and myocardial fibrosis.Consistently,our data indicated that YTHDF1 was involved in activation,proliferation,and migration to participate in cardiac fibrosis in vitro.Our results revealed that YTHDF1 could serve as a potential therapeutic target for myocardial fibrosis.

关键词： cardiac fibrosis YTHDF1 AXL ZBED6 heart failure

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极地船舶冰区回转数值模拟分析

船舶工程 2022年第10期44卷 52-57页

作者：刁峰顾颖杰周利王伟中国船舶科学研究中心江苏无锡214082 江苏科技大学船舶与海洋工程学院江苏镇江212003

优良的冰区操纵性能是船舶在极区安全航行和高效运营的重要保障,由于海冰的存在导致冰区操纵性能的预报相较于开敞水域更为复杂。文章聚焦极地船舶在平整冰中的回转运动,采用MMG分离建模思路,兼顾船体运动和冰阻力耦合的三自由度回转数... 详细信息

优良的冰区操纵性能是船舶在极区安全航行和高效运营的重要保障,由于海冰的存在导致冰区操纵性能的预报相较于开敞水域更为复杂。文章聚焦极地船舶在平整冰中的回转运动,采用MMG分离建模思路,兼顾船体运动和冰阻力耦合的三自由度回转数值模拟方法和冰阻力的实时计算应用,在水平面内建立一种基于预设冰网格技术的船-冰相互作用数值模型。文章以Tor Viking II号破冰船为研究对象,对其在平整冰中的回转运动进行数值模拟,获得了与实船测试相吻合的回转轨迹和最大回转直径,验证了数值模拟方法的有效性和高效性,具有较高的工程推广应用价值。

关键词：极地船舶平整冰回转预设冰网格数值模拟