检索结果-南通市图书馆

Crystallization behavior of blast-furnace slag by single hot thermocouple technique

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2020年第3期27卷 259-265页

作者： Tie-lei Tian Shuang Cai Yu-zhu Zhang hong-wei Xing College of Metallurgy and Energy North China University of Science and TechnologyTangshan 063009HebeiChina College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina

The crystallization behavior of blast-furnace slag under isothermal and continuous-cooling conditions was studied using the single hot thermocouple *** crystallization phases were obtained using FactSage software and X-ray *** crystallization kinetic parameters were calculated by combining these results with the Johnson-Mehl—Avrami *** isothermal conditions,the shortest crystallization incubation time was 24 and 18 s when the temperatures were 1300 and 1150℃,and the corresponding critical cooling rates were 4.5 and 14.3℃/s,*** 1270℃,the slag was difficult to crystallize and the fiber-forming rate *** the continuous-cooling rate was 6.5℃/s,the slag solidified into a glassy *** main crystallization phases,gehlenite,akermanite,anorthite,and melangite,were most easily *** growth factors of melangite and anorthite were approximately 1.63 and 1.68,respectively,which indicated that the crystals nucleated on the surface and grew in two dimensions.

关键词： Blast-furnace slag Cooling rate Crystallization Single hot thermocouple technique

基于稀疏实例与位置感知卷积的植物叶片实时分割方法

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

江苏农业学报 2024年第3期40卷 478-489页

作者：任守纲朱勇杰顾兴健武鹏飞徐焕良南京农业大学人工智能学院江苏南京210095 国家信息农业工程技术中心江苏南京210095 新疆兴农网信息中心/新疆维吾尔自治区农业气象台新疆乌鲁木齐830002

植物叶片分割在高通量植物表型数据获取任务中起着关键作用。目前,多数植物叶片分割方法专注于提高模型分割精度,却忽视模型复杂度和推理速度。针对该问题,本研究提出一种基于稀疏实例激活与有效位置感知卷积的实例分割模型(ePaCC-Spars... 详细信息

植物叶片分割在高通量植物表型数据获取任务中起着关键作用。目前,多数植物叶片分割方法专注于提高模型分割精度,却忽视模型复杂度和推理速度。针对该问题,本研究提出一种基于稀疏实例激活与有效位置感知卷积的实例分割模型(ePaCC-SparseInst),实现植物叶片实时、精确分割。在ePaCC-SparseInst中引入1组稀疏实例激活图作为叶片对象表示方式,并使用二部图匹配算法实现预测对象与实例激活图的一一映射,从而避免了繁琐的非极大值抑制(Non-maximum suppression,NMS)运算,提高了模型的推理速度。此外,在实例分支中引入有效位置感知卷积(ePaCC)模块,在增大模型全局感受野的同时提高了模型的推理速度。在Komatsuna数据集上,ePaCC-SparseInst平均分割精度(AP)达到85.33%,每秒传输帧数达到43.52。在相同训练条件下,ePaCC-SparseInst的性能优于SparseInst、Mask R-CNN、CondInst等实例分割算法。此外在CVPPP A5数据集上,ePaCC-SparseInst较上述算法同样取得了更好的分割精度和推理速度。本研究提出的方法采用纯卷积的架构实现了叶片的实时分割,可以为在移动端或边缘设备上获取植物表型数据提供技术支持。

关键词：实例分割计算机视觉植物表型叶片分割

维普期刊数据库博看期刊

刍论生物学概念的特点和高中生物学的概念体系

在线全文

学校读者我要写书评

暂无评论

生物学教学 2024年第7期49卷 86-88页

作者：朱鹤鸣浙江省宁海中学宁波315600

生物学中的概念众多。本文分析了生物学概念的五个特点,即逻辑性、辩证性、简约性、隐喻性和合目的性,并对高中生物学的概念体系进行了总结,以期为生物学概念的教学提供帮助。

关键词：生物学概念概念体系概念学习

基于多视角三维点云融合的采棉机器人视觉感知方法

在线全文

学校读者我要写书评

暂无评论

农业机械学报 2024年第4期55卷 74-81页

作者：刘坤王晓朱一帆南京工程学院自动化学院南京211167

针对传统采棉机器人因单一视角和二维图像信息带来的视觉感知局限问题,本文提出了一种多视角三维点云配准方法,以增强采棉机器人实时三维视觉感知能力。采用4台固定位姿的Realsense D435型深度相机,从不同视角获取棉花点云数据。通过Apr... 详细信息

针对传统采棉机器人因单一视角和二维图像信息带来的视觉感知局限问题,本文提出了一种多视角三维点云配准方法,以增强采棉机器人实时三维视觉感知能力。采用4台固定位姿的Realsense D435型深度相机,从不同视角获取棉花点云数据。通过AprilTags算法标定出深度相机RGB成像模块与Tag标签的相对位姿,并基于深度相机中RGB成像模块与立体成像模块坐标系间的转换关系,解算出各个相机间点云坐标的对应变换,进而实现点云间的融合配准。结果表明,本文配准方法的全局配准平均距离误差为0.93 cm,平均配准时间为0.025 s,表现出较高的配准精度和效率。同时,为满足采棉机器人感知的实时性要求,本文对算法中点云获取、背景滤波和融合配准等步骤进行了效率分析及优化,最终整体算法运行速度达到29.85 f/s,满足采棉机器人感知系统实时性需求。

关键词：采棉机器人视觉感知三维点云融合 AprilTags算法

Effect of annealing on properties of Al/steel composite plates prepared by surface oxidation treatment before cold roll bonding

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2023年第4期30卷 749-759页

作者： Lun Fu Yu-fei zhu Bin Yang Chao Yu hong Xiao National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao 066004HebeiChina

Al/steel composite plate has a wide application prospect,but great differences in properties between Al and steel are *** is difficult to obtain high bonding strength by the traditional cold roll bonding ***/steel composite plate was thus prepared by cold roll bonding at a reduction rate of 60%after oxidation treatment on the surface to be composited on the steel *** heat treatment of holding at 400℃ for 1 h and cooling with the furnace was then *** bonding strength,microstructure,and properties of the Al/steel composite plate before and after annealing were analysed and compared through shear test,bending test,tensile test,and *** show that the shear strengths of the interface before and after annealing are 100 and 80 MPa,*** the shear strength of the annealed Al/steel composite plate decreases,the bending and overall tensile properties of the composite plate are improved,showing better mechanical properties.

关键词： Al/steel composite plate Oxidation treatment Annealing treatment Shear strength Cold roll bonding

Characterization of whole genomes from recently emerging Mpox cases in several regions of China,2023

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2024年第5期67卷 1079-1081页

作者： Changcheng Wu Lunbiao Cui Yang Pan Ziquan Lv Mingxiao Yao Wenling Wang Fei Ye Weibang Huo Li Zhao Baoying Huang Fengcai zhu Roujian Lu Yao Deng Quanyi Wang Wenjie Tan NHC Key Laboratory of Biosafety National Institute for Viral Disease Control and PreventionChinese Center for Disease Control and PreventionBeijing 102206China NHC Key Laboratory of Enteric Pathogenic Microbiology Jiangsu Provincial Medical Key Laboratory of Pathogenic Microbiology in Emerging Major Infectious DiseasesJiangsu Provincial Center for Disease Control and PreventionNanjing 210009China Beijing Center for Disease Prevention and Control Beijing 100013China Central Laboratory Shenzhen Center for Disease Control and PreventionShenzhen 518055China Shandong Center for Disease Control and Prevention Jinan 250014China

Dear Editor,Mpox(formerly known as monkeypox)is a zoonotic disease caused by infection with the monkeypox virus(MPXV).Mpox cases have been sporadic over the past few decades,with outbreaks occurring in only a limited ... 详细信息

关键词： cases primarily imported

Dysfunction of autophagy as the pathological mechanism of motor neuron disease based on a patient-specific disease model

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2015年第4期31卷 445-451页

作者： Dan-Jing Yang liang zhu Jie Ren Rong-Jie Ma hongwen zhu Jun Xu Advanced Institute of Translational Medicine Tongji University East Hospital Tongji University School of Medicine Tianjin Hospital Tianjin Academy of Integrative Medicine

Autophagy is the main catabolic pathway in cells for the degradation of impaired proteins and organelles. Accumulating evidence supports the hypothesis that dysfunction of autophagy, leading to an imbalance of proteostasis and the accumulation of toxic proteins in neurons, is a central player in the pathogenesis of neurodegenerative diseases such as Alzheimer＇s disease, Parkinson＇s disease, and amyotrophic lateral sclerosis （ALS）. The clinical pathology of ALS is complex and many genes associated with autophagy and RNA processing are mutated in patients with the familial form. But a causal relationship between autophagic dysfunction and ALS has not been fully established. More importantly, studies on the pathological mechanism of ALS are mainly based on animal models that may not precisely recapitulate the disease itself in human beings. The development of human iPSC techniques allows us to address these issues directly in human cell models that may profoundly influence drug discovery for ALS.

关键词： motor neuron disease iPSC autophagy amyotrophic lateral sclerosis spinal muscular atrophy

在线全文

学校读者我要写书评

暂无评论

北魏“终宁陵令印”补释

文博 2024年第1期 53-56,89页

作者：朱棒湖南师范大学历史文化学院湖南长沙410006

《秦汉南北朝官印征存》中著录了一枚北魏“终宁陵令印”。结合终宁陵设置的时间,可知这枚官印制作于公元499年至519年之间,是目前所见的北魏陵园官印孤品。自汉元帝永光四年(前40)诏令勿置陵邑后,陵邑制度遂见废弛。魏晋以降,帝后陵也... 详细信息

《秦汉南北朝官印征存》中著录了一枚北魏“终宁陵令印”。结合终宁陵设置的时间,可知这枚官印制作于公元499年至519年之间,是目前所见的北魏陵园官印孤品。自汉元帝永光四年(前40)诏令勿置陵邑后,陵邑制度遂见废弛。魏晋以降,帝后陵也仅置园邑而不再置陵邑,园邑归陵园令长统属,其邑户多者不过三五百户,规模远小于秦汉时期比于县的陵邑。

关键词：终宁陵北魏官印陵邑园邑

Measurement of 2p-3d absorption in a hot molybdenum plasma

在线全文

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2024年第4期9卷 68-79页

作者： Gang Xiong Bo Qing Zhiyu Zhang Longfei Jing Yang Zhao Minxi Wei Yimeng Yang Lifei Hou Chengwu Huang Tuo zhu Tianming Song Min Lv Yan Zhao Yuxue Zhang Guohong Yang Zeqing Wu Jun Yan Yaming Zou Jiyan Zhang Jiamin Yang Shanghai EBIT Laboratory and Key Laboratory of Nuclear Physics and Ion-Beam Application(MOE)Institute of ModernPhysicsFudan UniversityShanghai 200433China Laser Fusion Research Center China Academy of Engineering PhysicsMianyang 621900China Institute of Applied Physics and Computational Mathematics Beijing 100088China

We present measurements of the 2p-3d transition opacity of a hot molybdenum-scandium sample with nearly half-vacant molybdenum M-shell configurations.A plastic-tamped molybdenum-scandium foil sample is radiatively heated to high temperature in a compact D-shaped gold Hohlraum driven by∼30 kJ laser energy at the SG-100 kJ laser facility.X rays transmitted through the molybdenum and scandium plasmas are diffracted by crystals and finally recorded by image *** electron temperatures in the sample in particular spatial and temporal zones are determined by the K-shell absorption of the scandium plasma.A combination of the IRAD3D view factor code and the MULTI hydrodynamic code is used to simulate the spatial distribution and temporal behavior of the sample temperature and *** inferred temperature in the molybdenum plasma reaches a average of 138±11 eV.A detailed configuration-accounting calculation of the n=2–3 transition absorption of the molybdenum plasma is compared with experimental measurements and quite good agreement is *** present measurements provide an opportunity to test opacity models for complicated M-shell configurations.

关键词： molybdenum absorption configuration