检索结果-南通市图书馆

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

基于gim的变电站模型轻量化三维展示研究

微型电脑应用 2024年第3期40卷 125-129页

作者：张磊章剑光赏炜吕亮张旭阳绍兴大明电力设计院有限公司浙江绍兴312000 绍兴建元电力集团有限公司大兴电力承装分公司浙江绍兴312000

针对电网可视化模型重构过程中存在模型冗余、非标化、信息丢失等问题,提出一种基于gim的变电站三维模型重构和优化方法。基于gim三维协同设计,构建变电站组件模型,通过层次划分、参数建模、属性入库、模型组装和优化将gim模型转化成标... 详细信息

针对电网可视化模型重构过程中存在模型冗余、非标化、信息丢失等问题,提出一种基于gim的变电站三维模型重构和优化方法。基于gim三维协同设计,构建变电站组件模型,通过层次划分、参数建模、属性入库、模型组装和优化将gim模型转化成标准FBX文件,降低模型数据量,实现gim模型优化。由方案库协同设计,实现电气、土建专业全周期协同,提升变电站全流程协同设计,提升模型实用性。某变电工程实践表明,采用的gim三维重构技术具有建模精度可控、复用率高、属性标准化入库的优点,通过模型优化,模型面片数减少,复用率提升。

关键词：变电站三维建模协同化设计 gim

电网基建工程数据中心助推数字化移交方案研究

在线全文

学校读者我要写书评

暂无评论

科学技术创新 2024年第8期 58-61页

作者：魏惠敏王秀芳赵超陈丽雅刘文杰北京洛斯达科技发展有限公司北京

本文指出了国家电网公司工程数据中心的建设目标,分析了输变电工程数字化移交现状和问题,探索形成了一套基于电网基建工程数据中心开展数字化移交的解决方案。依托国网湖南电力、湖北电力等数字化移交试点工程进行数字化移交解决方案验... 详细信息

本文指出了国家电网公司工程数据中心的建设目标,分析了输变电工程数字化移交现状和问题,探索形成了一套基于电网基建工程数据中心开展数字化移交的解决方案。依托国网湖南电力、湖北电力等数字化移交试点工程进行数字化移交解决方案验证,实现了电网输变电工程数字化移交提质增效。

关键词：工程数据中心数字化移交三维设计 gim 实物ID 解决方案

The dioxygenase gim_2 functions in seed germination by altering gibberellin production in Arabidopsis

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2018年第4期60卷 276-291页

作者： Wei Xiong Tiantian Ye Xuan Yao Xiong Liu Sheng Ma Xi Chen Ming-Luan Chen Yu-Qi Feng Yan Wu State Key Laboratory of Hybrid Rice College of Life SciencesWuhan University Key Laboratory of Analytical Chemistry for Biology and Medicine(Ministry of Education) Department of ChemistryWuhan University

The phytohormones gibberellic acid （GA） and abscisic acid （ABA） antagonistically control seed germina- tion. High levels of GA favor seed germination, whereas high levels of ABA hinder this process. The direct relationship between GA biosynthesis and seed germina- tion ability need further investigation. Here, we identified the ABA-insensitive gain-of-function mutant germination insensitive to ABA mutant 2 （gim2） by screening a population of XVE T-DNA-tagged mutant lines. Based on two loss-of-function gim2-ko mutant lines, the disruption of gim2 function caused a delay in seed germination. By contrast, upregulation of gim2 accelerated seed germina- tion, as observed in transgenic lines overexpressing gim2 （OE）. We detected a reduction in endogenous bioactive GA levels and an increase in endogenous ABA levels in the gim2-ko mutants compared to wild type. Conversely, the OE lines had increased endogenous bioactive GA levels and decreased endogenous ABA levels. The expression levels of a set of GA- and]or ABA-related genes were altered in both the gim2-ko mutants and the OE lines. We confirmed that gim2 has dioxygenase activity using an in vitro enzyme assay, observing that gim2 can oxidize GA^2. Hence, our characterization of gim2 demonstrates that it plays a role in seed germination by affecting the GA metabolic pathway in Arabidopsis.

关键词： GA gim The dioxygenase gim2 functions in seed germination by altering gibberellin production in Arabidopsis

A gim-Based Biomimetic Learning Approach for Motion Generation of a Multi-Joint Robotic Fish

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2013年第4期10卷 423-433页

作者： Qinyuan Ren Jianxin Xu Lupeng Fan Xuelei Niu Department of Electrical and Computer Engineering National University of Singapore Singapore

In this paper, we propose a biomimetic learning approach for motion generation of a multi-joint robotic fish. Based on a multi-joint robotic fish model, two basic Carangiform swimming patterns, namely ＂cruise＂ and ＂C sharp turning＂, are extracted as training samples from the observations of real fish swimming. A General Internal Model （gim）, which is an imitation of Central Pattern Generator （CPG） in nerve systems, is adopted to learn and to regenerate coordinated fish behaviors. By virtue of the universal function approximation ability and the temporal/spatial scalabilities of gim, the proposed learning approach is able to generate the same or similar fish swimming patterns by tuning two parameters. The learned swimming patterns are implemented on a multi-joint robotic fish in experiments. The experiment results verify the effectiveness of the biomimetic learning approach in generating and modifying locomotion patterns for the robotic fish.

关键词： robotic fish locomotion biomimetic learning gim

Non-sequential narrow band imaging for targeted biopsy and monitoring of gastric intestinal metaplasia

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2011年第10期17卷 1336-1342页

作者： Rungsun Rerknimitr Boonlert Imraporn Naruemon Klaikeaw Wiriyaporn Ridtitid Sukprasert Jutaghokiat Yuwadee Ponauthai Pradermchai Kongkam Pinit Kullavanijaya Division of Gastroenterology Department of MedicineFaculty of MedicineChulalongkorn University Department of Pathology Faculty of MedicineChulalongkorn University

AIM: To evaluate the efficacy of non-sequential narrow band imaging (NBI) for a better recognition of gastric intestinal metaplasia (gim). METHODS: Previously diagnosed gim patients underwent targeted biopsy from areas with and without gim, as indicated by NBI, twice at an interval of 1 year. The authors compared the endoscopic criteria such as light blue crest (LBC), villous pattern (VP), and large long crest (LLC) with standard histology. The results from two surveillance endoscopies were compared with histology results for sensitivity, specif icity, positive predic-tive value (PPV), negative predictive value (NPV), and likelihood ratio of positive test (LR+). The number of early gastric cancer cases detected was also reported. RESULTS: NBI targeted biopsy was performed in 38 and 26 patients during the first and second surveillance endoscopies, respectively. There were 2 early gastric cancers detected in the first endoscopy. No cancer was detected from the second study. Surgical and endoscopic resections were successfully performed in each patient. Sensitivity, specifi city, PPV, NPV, and LR+ of all 3 endoscopic criteria during the first/second surveillances were 78.8%/91.3%, 82.5%/89.1%, 72.8%/77.8%, 86.8%/96.1, and 4.51/8.4, respectively. LBC provided the highest LR+ over VP and LLC. CONCLUSION: Non-sequential NBI is useful for gim targeted biopsy. LBC provides the most sensitive reading. However, the optimal duration between two surveillances requires further study.

关键词：窄带干扰肠上皮胃粘膜活检监测成像 gim NBI

A Statistical Study on Seismo-Ionospheric Anomalies of the Total Electron Content for the Period of 56 M≥6.0 Earthquakes Occurring in China During 1998—2012

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

空间科学学报 2013年第3期33卷 258-269页

作者： Liu J Y Chen C H Tsai H F Le H Institute of Space Science National Central University Center for Space and Remote Sensing Research National Central University Department of Earth Science National Cheng Kung University GPS Science and Application Research Center National Central University Key Laboratory of Ionospheric Environment Institute of Geology and GeophysicsChinese Academy of Sciences

This paper reports statistical results of Seismo-Ionospheric Anomalies(SIAs) of the Total Electron Content(TEC) in the Global Ionosphere Map(gim) associated with 56 M≥6.0 earthquakes in China during 1998—2012.To detect SIA,a quartile-based(i.***.median-based) process is performed.TEC anomalies for the period of earthquakes without being led by magnetic storms about 10 days are further isolated and examined to confirm the SIP existence.Results show that SIA is the TEC significantly decrease in the afternoon period 2—9 days before the earthquakes in China,which is in a good agreement with the SIA appearing before the 12 May 2008 M 8.0 Wenchuan earthquake.

关键词：电离层异常地震发生总电子含量中国统计 SIAS TEC gim

在线全文

学校读者我要写书评

暂无评论

北斗三频电离层延迟及码硬件延迟解算方法

武汉大学学报（信息科学版） 2017年第10期42卷 1438-1445页

作者：王华润柴洪洲王敏潘宗鹏太原卫星发射中心测量控制站山西岢岚036301 信息工程大学地理空间信息学院河南郑州450001

准确固定非差模糊度是利用相位观测量获取高精度电离层延迟的关键。三频观测条件下常规的处理策略需依次固定超宽巷、宽巷以及窄巷模糊度,通常利用MW(melbourne-wubbena)组合解算宽巷模糊度时易受到码硬件延迟和观测噪声的影响而固定错... 详细信息

准确固定非差模糊度是利用相位观测量获取高精度电离层延迟的关键。三频观测条件下常规的处理策略需依次固定超宽巷、宽巷以及窄巷模糊度,通常利用MW(melbourne-wubbena)组合解算宽巷模糊度时易受到码硬件延迟和观测噪声的影响而固定错误。利用北斗三频数据和gim(grid ionosphenimap)产品,通过固定的超宽巷模糊度以及构造相位无几何组合解算宽巷模糊度,进而重构得到高精度电离层延迟,并且分离了码硬件延迟总量。结果表明,gim模型辅助条件下宽巷模糊度固定成功率能达到100%,且消除了系统性偏差;电离层重构值与gim模型改正值存在约1 m的差异,等效精度约6TECU;分离的码硬件延迟变化平稳,标准偏差不超过0.3 m。

关键词：三频非差模糊度解算 gim 电离层延迟重构码硬件延迟分离

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

利用数据同化技术实现区域电离层TEC重构

武汉大学学报（信息科学版） 2017年第8期42卷 1075-1081页

作者：欧明甄卫民徐继生於晓刘裔文刘钝武汉大学电子信息学院湖北武汉430079 中国电波传播研究所山东青岛266107

电离层参量的提取是开展电离层研究的基础,而数据同化技术则是获取电离层参量的一种重要手段。以NeQuick模型的输出作为背景场,Kalman滤波作为同化算法,利用数据同化技术实现区域电离层TEC重构,结果表明,数据同化方法重构的倾斜总电子含... 详细信息

电离层参量的提取是开展电离层研究的基础,而数据同化技术则是获取电离层参量的一种重要手段。以NeQuick模型的输出作为背景场,Kalman滤波作为同化算法,利用数据同化技术实现区域电离层TEC重构,结果表明,数据同化方法重构的倾斜总电子含量(TEC)和垂直TEC与实测值较为一致。相比NeQuick模型及全球电离层地图(gim)数据,数据同化方法重构得到的TEC的平均误差和标准差均有明显的降低,实测数据验证了数据同化技术在区域TEC重构中的精度和可靠性。

关键词：电离层数据同化 Kalman滤波 TEC重构 gim NeQuick模型

一种适用于电离层电子密度重构的AMART算法

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

测绘学报 2018年第1期47卷 57-63页

作者：赵海山杨力周阳林董明 78125部队信息工程大学卫星导航工程中心

针对传统乘法代数重构算法(MART)迭代精度不高的问题,提出一种自适应电离层层析新算法。一方面,该算法根据射线穿越像素点的截距和电子密度值的综合影响,合理地分配迭代差值;另一方面,提出一种与电子密度值相关的自适应松弛因子,有效克... 详细信息

针对传统乘法代数重构算法(MART)迭代精度不高的问题,提出一种自适应电离层层析新算法。一方面,该算法根据射线穿越像素点的截距和电子密度值的综合影响,合理地分配迭代差值;另一方面,提出一种与电子密度值相关的自适应松弛因子,有效克服传播噪声对电子密度反演的影响。试验采用全球电离层图(gim)数据和GPS双频观测数据分别从单射线迭代和多射线迭代两个方面对新方法的可行性和优越性进行验证。试验结果表明,相对于传统的MART算法,本文方法反演电子密度剖面更接近电离层测高仪观测结果。

关键词：电离层层析 MART算法电子密度 gim 迭代算法