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Deep learning approaches in flow visualization

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Advances in Aerodynamics 2022年第1期4卷 327-340页

作者： Can Liu Ruike Jiang Datong Wei changhe Yang Yanda Li Fang Wang Xiaoru Yuan Key Laboratory of Machine Perception(Ministry of Education) and School of AIPeking UniversityBeijingChina China Aerodynamics Research and Development Center MianyangChina National Engineering Laboratory for Big Data Analysis and Application Peking UniversityBeijingChina

With the development of deep learning(DL)techniques,many tasks in flow visualization that used to rely on complex analysis algorithms now can be replaced by DL *** reviewed the approaches to deep learning technology in flow visualization and discussed the technical benefits of these *** also analyzed the prospects of the development of flow visualization with the help of deep learning.

关键词： Deep learning Flow visualization Data management Feature extraction Particle tracing

Preparation and Application of Bauxite-based Sintered Mullite Homogenized Grog in Ladle Castable

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China's Refractories 2016年第4期25卷 18-22页

作者： AN Jiancheng GAO changhe WANG Yali CHEN Chaoqun WANG Linjun Tongda Refractory Technologies Co. Ltd. Yangquan Jinyu Tongda High-temperature Materials Co. Ltd.

Preparation of bauxite-based sintered mullite homogenized grog was introduced and its application in ladle castable was *** kinds of bauxite-based sintered mullite homogenized grogs were used,named as GA and GB,*** results show that bauxitebased sintered homogenized grog with uniform components,stable microstructure and mullite as main crystal phase can be prepared using joint process of three-step homogenization,automatic component batching,wet cogrinding,high-temperature *** also indicates that carbon steel ladle castables with GA or composite aggregate of GA and GB as main materials have the same excellent general performance indicators,great erosion resistance,anti-strip performance and longer service life in field applications,and compared with castables with single aggregate of GA,the castables with aggregate of GA and GB as main materials had higher cost performance because of lower bulk density of GB.

关键词： mullite aggregate bauxite sintered alumina longer compressive controllable homogenization advantageous

Overcoming Difficulties in the Study of Democracy

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Qiu Shi 2013年第4期5卷 53-60页

作者： Su changhe the School of International Relations and Public Affairs Fudan University

Farmland changes and the driving forces in Yucheng, North China Plain

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Journal of Geographical Sciences 2012年第3期22卷 563-573页

作者： Chen Zhao Lu changhe Fan Lan Institute of Geographic Sciences and Natural Resources Research CAS Graduate University of Chinese Academy of Sciences

Taking Yucheng, a typical agricultural county in Shandong Province as a case, this study applied Logistic regression models to spatially identify factors affecting farmland changes. Using two phases of high resolution imageries in 2001 and 2009, the study obtained the land use and farmland change data in 2001-2009. It was found that the farmland was reduced by 5.14% in the period, mainly due to the farmland conversion to forest land and built-up land, although part of forest land and unused land was converted to farmland. The results of Logistic regressions indicated that location, population growth and farmer income were main factors affecting the farmland conversion, while soil types and pro-curvature were main natural factors controlling the distribution of farmland changes. Regional differences and temporal-spatial variables of farmland changes affected fitting capability of the Logistic regression models. The ROC fitting test indicated that the Logistic regression models gave a good explanation of the regional land-use changes. Logistic regression analysis is a good tool to identify major factors affecting land use change by quantifying the contribution of each factor.

关键词： farmland changes driving factors Logistic regression model

Optical multi-imaging–casting accelerator for fully parallel universal convolution computing

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Photonics Research 2023年第2期11卷 299-312页

作者： GUOQING MA JUNJIE YU RONGWEI ZHU changhe ZHOU Laboratory of Information Optics and Optoelectronic Technology Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Recently, optical computing has emerged as a potential solution to computationally heavy convolution, aiming at accelerating various large science and engineering tasks. Based on optical multi-imaging–casting architecture, we propose a paradigm for a universal optical convolutional accelerator with truly massive parallelism and high precision. A two-dimensional Dammann grating is the key element for generating multiple displaced images of the kernel, which is the core process for kernel sliding on the convolved matrix in optical convolutional architecture. Our experimental results indicate that the computing accuracy is typically about 8 bits, and this accuracy could be improved further if high-contrast modulators are used. Moreover, a hybrid analog–digital coding method is demonstrated to improve computing accuracy. Additionally, a convolutional neural network for the standard MNIST dataset is demonstrated, with recognition accuracy for inference reaching 97.3%. Since this architecture could function under incoherent light illumination, this scheme will provide opportunities for handling white-light images directly from lenses without photoelectric conversion, in addition to convolutional accelerators.

关键词： computing casting kernel

Changes in the International Landscape

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Qiu Shi 2017年第2期9卷 131-136页

作者： Su changhe

Where Does the Chinese People＇s Confidence Come from？

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Qiu Shi 2016年第2期8卷 76-81页

作者： Su changhe Shanghai Research Center for the Theories of Socialism with Chinese Characteristics

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新疆大豆主要种植品种与排种器适配情况探究

新疆农机化 2024年第2期 8-10,28页

作者：白志业杨豫新班婷刘奎牛长河新疆农业科学院农业机械化研究所新疆乌鲁木齐830091

大豆是我国重要的经济作物,在我国农业生产中占有重要地位。目前大豆品种繁多,形状尺寸多样且差异较大,大豆排种器结构单一、尺寸固定,同一排种器播种不同大豆品种适应性较差。本文收集并测量新疆主栽大豆品种三轴尺寸,通过查阅大豆排... 详细信息

大豆是我国重要的经济作物,在我国农业生产中占有重要地位。目前大豆品种繁多,形状尺寸多样且差异较大,大豆排种器结构单一、尺寸固定,同一排种器播种不同大豆品种适应性较差。本文收集并测量新疆主栽大豆品种三轴尺寸,通过查阅大豆排种器相关文献,总结大豆排种器研究现状,分析大豆与现有排种器适配情况,对新疆主栽大豆播种机械化发展做出展望,为未来大豆播种机具创新发展提供参考。

关键词：大豆品种大豆排种器适配

6个不同品种荔枝果肉内生细菌群落多样性的高通量测序分析

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广东农业科学 2024年第2期51卷 29-38页

作者：史发超蔡长河严倩姜永华刘海伦文英杰欧良喜陈洁珍广东省农业科学院果树研究所/农业农村部南亚热带果树生物学与遗传资源利用重点实验室/广东省热带亚热带果树研究重点实验室广东广州510640

【目的】内生菌在植物生长发育中发挥重要作用,分析不同品种荔枝果肉内生细菌群落结构及多样性,挖掘和利用潜在荔枝内生菌种资源,为进一步研究荔枝与内生菌互作关系提供参考依据。【方法】以6个不同品种荔枝的果肉组织为材料,PCR扩增16S... 详细信息

【目的】内生菌在植物生长发育中发挥重要作用,分析不同品种荔枝果肉内生细菌群落结构及多样性,挖掘和利用潜在荔枝内生菌种资源,为进一步研究荔枝与内生菌互作关系提供参考依据。【方法】以6个不同品种荔枝的果肉组织为材料,PCR扩增16SrDNA的V3~V4区,利用MiSeq高通量测序技术分析果肉组织内生细菌在门、科、属和种分类水平上的群落组成及优势菌群,结合Alpha多样性分析评估内生细菌群落多样性。【结果】对6个品种荔枝果肉内生细菌16S rDNA的V3~V4区进行扩增,共获得2139086条序列,其平均长度为376 bp。不同品种荔枝果肉内生细菌群落在相对丰度和多样性上无显著差异。在门分类水平,变形菌门为主要优势细菌门类,其次为放线菌门。在科、属和种分类水平上,不同品种荔枝内生菌群落结构相似,但相对丰度占比不同。差异菌群分析结果显示,假单胞菌属(Pseudomonas)、果胶杆菌属(Pectobacterium)、苍白杆菌属(Ochrobactrum)和迪基氏菌属(Dickeya)在优良品种‘鹅蛋荔’‘糯米糍’和‘观音绿’中显著富集,根瘤菌属(Bradyrhizobium)和变形菌属(Snodgrassella)只在‘鹅蛋荔’中富集。根据菌群相对丰度进行聚类分析,‘观音绿’‘糯米糍’和‘鹅蛋荔’的相似性更高。Alpha多样性分析结果表明,6种荔枝果肉内生菌群仅在丰度和多样性上存在差异,但未达到显著水平。【结论】该研究首次分析了6个不同品种荔枝果肉内生细菌的群落结构,并在优良荔枝品种中发现特有的微生物类群富集现象,可为后续提升荔枝品质、开发利用内生菌提供理论依据和重要参考。

关键词：荔枝果肉内生细菌群落结构微生物多样性优势菌群高通量测序