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Journal of Materials Science & Technology 2020年第13期47卷 44-56页

作者： Guanyi Jing Wenpu Huang huihui yang Zemin Wang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China

300 M ultra-high strength steel has been widely used in critical structural components for aviation and aerospace vehicles,owing to its high strength,excellent transverse plasticity,fracture toughness and fatigue ***,low and high power selective laser melting(SLM)of 300 M steel and their microstructural evolution and mechanical properties have been *** results show that the optimal energy density range with the highest relative density for SLMed 300 M steel is between 60 and160 J/mm^***,molten pools for deposition exhibit a conduction mode with semi-elliptical shape at a lower laser power of 300~600 W but a keyhole mode with"U"shape at a higher laser power of 800~1900 *** heterogeneous microstructure of as-built samples is cha racterized by a skin-core structure which is that tempered troostite with the coarse non-equiaxed grains in the molten pool is wrapped by tempered sorbite with the fine equiaxed grains in the heat-affected *** skin-core structure of SLMed 300 M steel has the characteristics of hard inside and soft *** average microhardness of samples varies from 385 to 341 HV when laser power increases from 300 to 1900 ***,ultimate tensile strength(1156-1193 MPa)and yield tensile strength(1085-1145 MPa)of dense samples fabricated at diffe rent laser powers vary ***,the elongation(6.8-9.1%)of SLMed 300 M steel is greatly affected by the laser power.

关键词： Selective laser melting(SLM) 300M ultra-high strength steel Microstructural evolution Mechanical properties

Effects of circular beam oscillation technique on formability and solidification behaviour of selective laser melted Inconel 718:From single tracks to cuboid samples

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Journal of Materials Science & Technology 2020年第16期47卷 137-150页

作者： huihui yang Guanyi Jing Piao Gao Zemin Wang Xiangyou Li Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China

The inherent drawbacks of selective laser melting technique including serious micro-pore and element microsegregation problems destroy the mechanical property of the *** overcome this problem,a new approach,circular beam oscillation,was successfully applied in the SLMed Inconel 718 samples including single tracks,thin walls and cuboid *** one hand,circular beam oscillation reduces the micro-pores in molten pools and cuboid samples,increasing the relative density of the cuboid sample to 99.95%.On the other hand,circular beam oscillation suppresses the element microsegregation,reducing the formation of Laves phases in SLMed Inconel 718 ***,circular beam oscillation enhances thetexture of thin walls and thetexture of cuboid *** improvement of formability and microstructure of the SLMed samples with oscillation is closely related to cooling rate,thermal gradient and stirring effect during the solidification ***,circular beam oscillation shows the possibility to overcome the key bottlenecks of the traditional SLM technology and to realize a further industrial application of SLM technology.

关键词： Circular beam oscillation Selective laser melting Inconel 718 Solidification behaviour

Controllable in-situ aging during selective laser melting: Stepwise precipitation of multiple strengthening phases in Inconel 718 alloy

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Journal of Materials Science & Technology 2019年第9期35卷 1925-1930页

作者： huihui yang Jingjing yang Wenpu Huang Guanyi Jing Zemin Wang Xiaoyan Zeng Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology

A controllable in-situ aging treatment of Inconel 718 alloy was successfully developed by governing the types and times of the thermal cycles during selective laser melting(SLM).The sequential precipitation of γ’,composite phase of primary/secondary γ’ coated by a γ " shell,and γ" occurs as the times of vertical thermal cycles increase when laser peak temperature(Tp)is between the precipitation temperature of strengthening phase(Tpre)and liquid temperature(T_L),which causes an increase in microhardness by 40 ***,short-term aging mechanisms on three types of strengthening phases are proposed based on a great number of vacancies in the matrix.

关键词： Selective laser melting In-situ aging Inconel 718 Strengthening phases Stepwise precipitation

Development of branchless watermelon near isogenic lines by marker assisted selection

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Horticultural Plant Journal 2022年第5期8卷 627-636页

作者： Junling Dou Yinping Wang huihui yang Huanhuan Niu Dongming Liu Sen yang Huayu Zhu Shouru Sun Luming yang Henan Key Laboratory of Fruit and Cucurbit Biology College of HorticultureHenan Agricultural UniversityZhengzhou450002China

Pruning is time-consuming and laborious in watermelon cultivation,which can not meet the needs for simplified cultivation in the *** development of branchless lines will provide important germplasms for breeding watermelon varieties and is an important method for genetic *** this study,the watermelon accession,Wu Cha Zao(WCZ)is a branchless inbred line that carries the branchless gene Clbl,which was used as the donor parent to develop branchless near isogenic lines(NILs).To construct the NILs of Clbl,WCZ crossed with the normal branching watermelon inbred line WT20 which was used as the recurrent *** co-segregating markers dCAPS10 and Indel1 with Clbl were used for foreground selection,and a total of 108 SSR markers was selected with good polymorphism between two parental lines for background selection which had relatively uniform distribution across 11 *** these markers to select individuals from the BC_(1)F_(1),BC_(2)F_(1),and BC_(2)F_(2) generations,three NILs with a proportion of recurrent parent genome(PRPG)>99%were finally *** lateral branch and plant height phenotypes did not significantly differ between the NILs and WCZ,indicating that the NILs of Clbl under the genetic background of WT20 has been successfully *** results provide ideal materials for further in-depth analysis of the genetic mechanisms of lateral branch development and ideal plant architecture breeding in watermelon.

关键词： Watermelon Branchless Clbl Near isogenic lines Marker assisted selection

Cracking behavior and control of β-solidifying Ti-40Al-9V-0.5Y alloy produced by selective laser melting

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Journal of Materials Science & Technology 2020年第4期39卷 144-154页

作者： Piao Gao Wenpu Huang huihui yang Guanyi Jing Qi Liu Guoqing Wang Zemin Wang Xiaoyan Zeng Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China China Academy of Launch Vehicle Technology Beijing 100076China

Aβ-solidifying Ti-40 Al-9 V-0.5 Y(at.%)alloy with a high cracking sensitivity has been successfully fabricated by selective laser melting(SLM)in this *** influence factors for cracking sensitivity,cracking behavior and crack inhibition mechanism were *** results show that the effects of process parameters on cracking sensitivity strongly depend on the cooling rate in molten pool with different heat transfer *** conduction mode with higher cooling rates exhibits a higher cracking sensitivity in comparison to the keyhole *** characteristics and phase transformations controlled by cooling rate determine the inherent ductility ofβ-solidifyingγ-Ti Al alloys during *** this basis,the formation and inhibition mechanism of solidification and cold cracking are ***,the crackfree Ti-40 Al-9 V-0.5 Y sample with fine equiaxed microstructures and favorable mechanical properties(microhardness of 542±19 HV,yield strength of 1871±12 MPa,ultimate strength of 2106±13 MPa and ultimate compressive strain of 10.89±0.57%)can be produced by *** strengthening mechanism can be attributed to grain refinement and precipitation strengthening.

关键词： Selective laser melting β-solidifyingγ-TiAl alloy Cracking behavior Cracking control Microstructure Phase transformation

A multi-scale features-based method to detect Oplegnathus

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Information Processing in Agriculture 2021年第3期8卷 437-445页

作者： Jun Yue huihui yang Shixiang Jia Qing Wang Zhenbo Li Guangjie Kou Ruijia Ba School of Information and Electrical Engineering Ludong UniversityYantai 264025China School of Civil Engineering Ludong UniversityYantai 264025China School of Information and Electrical Engineering China Agricultrual UniversityBeijing 100083China

It is of great significance to use underwater video and image processing technology to detect and analyze fish *** this paper,an Oplegnathus image dataset for fish behaviors study by deep learning algorithm is constructed,and the data is captured from two cameras(one above water and another below water);and then an improved Neural Network model based on multi-scale features is proposed for fish behaviors learning *** overcome the occlusion and blur problems of the images,the lightweight neu-ral network MobileNet-SSD is improved by adding a dilate convolution,and SE blocks are added to the feature maps at different scales to establish a self-attention mechanism;the Focal Loss function is used to calculate the classification loss and to balance the propor-tion of background and target *** results of the experiments show that the aver-age behaviors detection accuracy of our method reach 90.94%and 88.36%in both overwater and underwater datasets.

关键词： Detection of the Oplegnathus Deep learning MobileNet-SSD Neural networks

Two-dimensional coordination polymer-based nanosensor for sensitive and reliable nucleic acids detection in living cells

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Chinese Chemical Letters 2022年第2期33卷 968-972页

作者： Yuzhi Xu Yanfei Zhang huihui yang Wen Yin Leli Zeng Shuo Fang Si-yang Liu Zong Dai Xiaoyong Zou Yihang Pan Precision Medicine Center Scientific Research CenterThe Seventh Affiliated HospitalSun Yat-sen UniversityShenzhen 518107China Key Laboratory of Sensing Technology and Biomedical Instrument of Guangdong Province School of Biomedical EngineeringSun Yat-sen UniversityGuangzhou 510006China School of Chemistry Sun Yat-sen UniversityGuangzhou 510275China Department of Oncology The Seventh Affiliated HospitalSun Yat-sen UniversityShenzhen 518107China

A reliable and sensitive strategy which can assess nucleic acid levels in living cells would be essential for fundamental research of biomedical applications. Some nanomaterial-based fluorescence biosensors recently developed for detecting nucleic acids, however, are often with expensive, complicated and timeconsuming preparation process. Here, by using a facile bottom-up synthesis method, a two-dimensional(2 D) coordination polymer(CP) nanosheet, [Cu(tz)](Htz = 1,2,4-triazole), was successfully prepared after optimizing reaction conditions. These ultrathin CP nanosheets with thickness of 4.7 ± 1.1 nm could readily form nanosensors by assembly with DNA probes, which exhibited a low limit of detection(LOD)for p53 DNA fragment as 144 pmol/L. Furthermore, by integrating [Cu(tz)] nanosheets with hybridization chain reaction(HCR) probes, mi R-21, one kind of micro RNA upregulated in many cancer cells, can be sensitively detected with a LOD of 100 pmol/L and monitored in living cells, giving consistent results with those obtained by quantitative reverse-transcription polymerase chain reaction(q RT-PCR) *** [Cu(tz)] nanosheets, which not only possess much better nucleic acids sensing performance than bulk cystals, but also exhibit nucleic acid delivery functions, could be used as a novel nanoplatform in biomedical imaging and sensing applications.

关键词： Coordination polymers Nanosheets Fluorescence biosensor Nucleic acids detection Living cells

Recent advances in preparation,properties and device applications of twodimensional h-BN and its vertical heterostructures

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Journal of Semiconductors 2017年第3期38卷 25-43页

作者： huihui yang Feng Gao Mingjin Dai Dechang Jia Yu Zhou Pingan Hu Institute for Advanced Ceramics Harbin Institute of Technology Harbin 150001 China Key Lab of Microsystem and Microstructure Harbin Institute of Technology Harbin 150080 China School of Materials and Science Engineering Harbin Institute of Technology Harbin 150080 China

Two-dimensional（2D） layered materials,such as graphene,hexagonal boron nitride（h-BN）,molybdenum disulfide（Mo S_2/,have attracted tremendous interest due to their atom-thickness structures and excellent physical properties.h-BN has predominant advantages as the dielectric substrate in FET devices due to its outstanding properties such as chemically inert surface,being free of dangling bonds and surface charge traps,especially the large-band-gap insulativity.h-BN involved vertical heterostructures have been widely exploited during the past few *** heterostructures adopting h-BN as dielectric layers exhibit enhanced electronic performance,and provide further possibilities for device ***,a series of intriguing physical phenomena are observed in certain vertical heterostructures,such as superlattice potential induced replication of Dirac points,band gap tuning,Hofstadter butterfly states,gate-dependent pseudospin *** we focus on the rapid developments of h-BN synthesis and fabrication of vertical heterostructures devices based on h-BN,and review the novel properties as well as the potential applications of the heterostructures composed of h-BN.

关键词： h-BN heterostructures graphene van der Waals epitaxy FETs

Highly efficient gene editing and single cell analysis of hematopoietic stem/progenitor cells from X-linked sideroblastic anemia patients

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Signal Transduction and Targeted Therapy 2021年第8期6卷 2284-2286页

作者： Riguo Fang Jingliao Zhang huihui yang Jia Shi Huimin Zeng Xiaofan Zhu Dong Wei Pengfei Yuan Tao Cheng Yingchi Zhang EdiGene Inc. BeijingChina EdiGene(Guangzhou)Inc. GuangzhouChina Stote Key Laboratory of Experimental Hematology National Clinical Research Center for Blood DiseasesInstitute of Hematology&Blood Diseases HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeTianjinChina Department of Pediatrics Peking University People's HospitalBeijingChina

Dear Editor,X-linked sideroblastic anemia(XLSA),which is the most common genetic form of congenital sideroblastic anemia,is typically characterized by reduced heme synthesis and the presence of bone marrow(BM)ring sid... 详细信息

关键词： anemia sideroblast hematopoietic

Evaluation of Urban Park Landscape in Ma’anshan Based on Analytic Hierarchy Process(AHP)

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Journal of Landscape Research 2020年第5期12卷 94-96,102页

作者： REN Yao ZHUANG Dehong WANG Zhenting yang huihui Academy of Art and Design Anhui University of TechnologyMa’anshanAnhui 243032China Nanjing Institute of Geography and Limnology Chinese Academy of SciencesNanjingJiangsu 210008China Funan Jinyuan Liumu Handicraft Co. Ltd.FuyangAnhui 236300China

In order to further develop the urban park landscape,the representative urban park landscape in Ma’anshan City is first evaluated and analyzed from the aspects of humanistic artistic value,social historical value and user experience ***,the weight of each park landscape is judged by analytic hierarchy process(AHP),and it is found that the indexes in the criterion layer successively are user experience value>humanistic artistic value>social historical value;in the factor layer,excellent user experience,universal design,reasonable and perfect public services and layout suitable for urban planning are more important factors,while artistic conception creation has the lowest ***,based on the results obtained by AHP,the improvement and optimization strategy for urban park landscape in Ma’anshan City is proposed to further strengthen the development of urban parks in Ma’anshan City.

关键词： AHP Ma’anshan City Urban park landscape User evaluation