检索结果-南通市图书馆

Ionospheric vertical total electron content prediction model in low-latitude regions based on long short-term memory neural network

引用

Chinese Physics B 2022年第8期31卷 347-358页

作者： Tong-Bao Zhang Hui-Jian Liang Shi-guang Wang Chen-guang ouyang Department of Precision Instrument Tsinghua UniversityBeijing 100084China State Key Laboratory of Precision Measurement Technology and Instrument Tsinghua UniversityBeijing 100084China Department of Electronic Engineer Tsinghua UniversityBeijing 100084China

Ionosphere delay is one of the main sources of noise affecting global navigation satellite systems, operation of radio detection and ranging systems and very-long-baseline-interferometry. One of the most important and common methods to reduce this phase delay is to establish accurate nowcasting and forecasting ionospheric total electron content models. For forecasting models, compared to mid-to-high latitudes, at low latitudes, an active ionosphere leads to extreme differences between long-term prediction models and the actual state of the ionosphere. To solve the problem of low accuracy for long-term prediction models at low latitudes, this article provides a low-latitude, long-term ionospheric prediction model based on a multi-input-multi-output, long-short-term memory neural network. To verify the feasibility of the model, we first made predictions of the vertical total electron content data 24 and 48 hours in advance for each day of July 2020 and then compared both the predictions corresponding to a given day, for all days. Furthermore, in the model modification part, we selected historical data from June 2020 for the validation set, determined a large offset from the results that were predicted to be active, and used the ratio of the mean absolute error of the detected results to that of the predicted results as a correction coefficient to modify our multi-input-multi-output long short-term memory model. The average root mean square error of the 24-hour-advance predictions of our modified model was 4.4 TECU, which was lower and better than5.1 TECU of the multi-input-multi-output, long short-term memory model and 5.9 TECU of the IRI-2016 model.

关键词： long-short-term memory neural network equatorial ionosphere vertical total electron content vertical total electron content(vTEC)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Research on Coordinated Development and Optimization of Distribution Networks at All Levels in Distributed Power Energy Engineering

引用

Energy Engineering 2023年第7期120卷 1655-1666页

作者： Zhuohan Jiang Jingyi Tu Shuncheng Liu Jian Peng guang ouyang Economic and Technological Research Institute State Grid Hunan Electric Power Co.Ltd.Changsha410007China Distribution Network Planning and Research Center Tiandi Dianyan(Beijing)Technology Co.Ltd.Beijing102206China

The uncertainty of distributed generation energy has dramatically challenged the coordinated development of distribution networks at all *** paper focuses on the multi-time-scale regulation model of distributed generation energy under normal *** simulation results of the example verify the self-optimization characteristics and the effectiveness of real-time dispatching of the distribution network control technology at all levels under multiple time scales.

关键词： Distributed power generation energy engineering multiple time scales joint development of distribution network global optimization regional autonomy

来源：

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

Research and Application of Internal Combustion Coal-Oxygen Burner for Fluxing in EAF

引用

Journal of Iron and Steel Research International 1999年第1期6卷 23-26页

作者： Zhu Rong Sun Yanhui Qiu Yongquan ouyang guang Chen Haiping Guo Changhua University of Science and Technology Beijing Xinyu Iron and Steel Company

The investigation shows that using internal combustion coal-oxygen burner for the intensification of melting in EAF is *** combustion coal-oxygen burner is better than external combustion coal-oxygen burner in the performance and energy saving of the *** consumption is decreased by 40 kW ? h/t,melting time is shortened by 18 *** application of internal combustion coal-oxygen burner has a significant effect on decreasing EAF energy consumption.

关键词： EAF coal-oxygen burner internal combustion energy saving

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Endovascular treatment of direct carotid cavernous fistula resulting from rupture of intracavernous carotid aneurysm: A case report

引用

World Journal of Clinical Cases 2024年第11期12卷 1940-1946页

作者： guang ouyang Kai-Li Zheng Kuan Luo Mu Qiao Yuan Zhu De-Rui Pan Department of Neurosurgery Puren Hospital Affiliated to Wuhan University of Science and TechnologyWuhan 430081Hubei ProvinceChina Department of Neurosurgery The Third Hospital of WuhanWuhan 430081Hubei ProvinceChina

BACKGROUND Direct carotid cavernous fistulas(CCFs)are typically the result of a severe traumatic brain ***-flow arteriovenous shunts secondary to rupture of an intracavernous aneurysm,resulting in direct CCFs,are *** use of a pipeline embolization device in conjunction with coils and Onyx glue for treatment of direct high-flow CCF resulting from ruptured cavernous carotid artery aneurysm in a clinical setting is not well *** SUMMARY A 58-year-old woman presented to our department with symptoms of blepharoptosis and intracranial bruits for 1 *** physical examination,there was right eye exophthalmos and ocular motor *** rest of the neurological examination was ***,the patient had no history of head *** patient was treated with a pipeline embolization device in the ipsilateral internal carotid artery across the *** and Onyx were placed through the femoral venous route,followed by placement of the pipeline embolization device with assistance from a balloon-coiling *** intraoperative or perioperative complications *** symptoms of bulbar hyperemia and bruits subsided immediately after the *** Pipeline embolization device in conjunction with coiling and Onyx may be a safe and effective approach for direct CCFs.

关键词： Intravascular therapy Carotid cavernous fistulas Intracavernous carotid aneurysms Case report

来源：

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

有重复观测时变系数线性结构关系EV模型的参数估计

引用

应用数学学报 2006年第2期29卷 247-253页

作者：欧阳光湘南学院数学系郴州423000

利用重复观测数据和加权方法给出了有重复观测时变系数一维线性结构关系EV模型中的参数估计,证明了估计的弱相合性和强相合性．

关键词：变系数线性结构关系EV模型重复观测相合性

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

昆钢2×120万t／a氧化球团二期生产线自动控制系统的设计

引用

烧结球团 2009年第1期34卷 30-36页

作者：欧阳光昆钢技术中心 650302

基于昆钢2×120万t/a氧化球团二期生产线的工艺流程特点和工艺对控制的要求,控制系统采用了"集中监测,分散控制"的设计思路,由计算机作为中央监控操作站,以PLC作为现场控制站,组成仪电合一的集散型控制系统。本文结合生产工艺特点,阐述... 详细信息

基于昆钢2×120万t/a氧化球团二期生产线的工艺流程特点和工艺对控制的要求,控制系统采用了"集中监测,分散控制"的设计思路,由计算机作为中央监控操作站,以PLC作为现场控制站,组成仪电合一的集散型控制系统。本文结合生产工艺特点,阐述了自动控制系统的设计思路、系统构成、功能和技术特点。

关键词：氧化球团自动控制系统 Quantum PLC控制功能

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Shuyu pills inhibit immune escape and enhance chemosensitization in hepatocellular carcinoma

引用

World Journal of Gastrointestinal Oncology 2021年第11期13卷 1725-1740页

作者： Zhe Deng Yong-Jie Teng Qing Zhou Zhao-guang ouyang Yu-Xing Hu Hong-Ping Long Mei-Jie Hu Si Mei Feng-Xia Lin Xin-Jun Dai Bo-Yu Zhang Ting Feng Xue-Fei Tian College of Integrated Chinese and Western Medicine Hunan Key Laboratory of Translational Research in Formulas and Zheng of Traditional Chinese MedicineHunan University of Chinese MedicineChangsha 410208Hunan ProvinceChina The First Hospital of Hunan University of Chinese Medicine Hunan University of Chinese MedicineChangsha 410208Hunan ProvinceChina Department of Preventive Dentistry Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative MedicineGuangzhou Medical UniversityGuangzhou 510132Guangdong ProvinceChina Experiment Center of Medical Innovation The First Hospital of Hunan University of Chinese MedicineHunan University of Chinese MedicineChangsha 410208Hunan ProvinceChina Department of Physiology Hunan University of Chinese MedicineChangsha 410208Hunan ProvinceChina Department of Cardiology Shenzhen Bao'an Traditional Chinese Medicine Hospital GroupThe Affiliated Hospital of Guangzhou University of Chinese MedicineShenzhen 518133Guangdong ProvinceChina College of Acupuncture and Massage Hunan University of Chinese MedicineChangsha 410208Hunan ProvinceChina

BACKGROUND Hepatocellular carcinoma(HCC)is characterized by dysregulation of the immune microenvironment and the development of ***,expression of the programmed cell death protein 1(PD-1)/programmed cell death 1 ligand 1(PD-L1)axis,an immune checkpoint,may lead to tumour immune escape,resulting in disease *** latest research shows that tumour immune escape may be caused by the upregulation of PD-L1 mediated by hypoxia-inducible factor-1 alpha(HIF-1α),and simultaneous inhibition of HIF-1αand PD-L1 has the potential to enhance the host’s antitumour ***,inhibition of the PD-1/PD-L1 axis may mitigate tumour *** pills(SYPs)contain immunity-enhancing and antitumour components,making them a potential HCC *** To investigate the efficacy of SYPs for HCC treatment via simultaneous HIF-1α and PD-L1 inhibition and the mechanism *** A subcutaneous xenograft tumour model was first established in BALB/c nude mice by the subcutaneous injection of 1×107 SMMC-7721 *** mice(male,5 weeks old;n=24)were then randomly divided into the following four groups(n=6):Control(0.9%normal saline),SYP(200 mg/kg),SYP+cisplatin(DDP)(200 mg/kg+5 mg/kg DDP weekly via intraperitoneal injection),and DDP(5 mg/kg cisplatin weekly via intraperitoneal injection).The dose of saline or SYPs for the indicated mouse groups was 0.2 mL/d via intragastric *** tumour volumes and body weights of the mice were measured every 2 *** mice were euthanized by cervical dislocation after 14 d of continuous treatment,and the xenograft tissues were excised and *** blot assays were used to measure the protein expression of HIF-1α,PD1,PD-L1,CD4+T cells,and CD8+T cells in HCC tumours from *** reverse transcription polymerase chain reaction was used for real-time quantitative detection of PD-1,PD-L1,and HIF-1α mRNA *** immunofluorescence assay was conducted to examine the expressio

关键词： Shuyu pills Hepatocellular carcinoma Tumour microenvironment Immune escape Chemoresistance

来源：

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

大气环境容量A-P值法中A值的修正算法

引用

环境科学研究 2008年第1期21卷 37-40页

作者：欧阳晓光中冶华天工程技术有限公司环境保护研究所安徽马鞍山243005

A值是A-P值法计算大气环境容量的关键参数之一,合理确定A值有利于保护大气环境质量和维护大气污染物排放单位的利益.以单箱模型中A值法的基本原理为基础,采用《环境影响评价技术导则大气环境》(HJ/T2.2-93)的公式法确定混合层厚度(Hi),... 详细信息

A值是A-P值法计算大气环境容量的关键参数之一,合理确定A值有利于保护大气环境质量和维护大气污染物排放单位的利益.以单箱模型中A值法的基本原理为基础,采用《环境影响评价技术导则大气环境》(HJ/T2.2-93)的公式法确定混合层厚度(Hi),对不同大气稳定度下计算A值的单箱模型法进行修正;以《制定地方大气污染物排放标准的技术方法》(GB/T13201-91)中给出的各地区A值的取值范围为基础,依据污染物日均质量浓度达标保证率,提出计算A值的达标保证率法,并根据确定达标保证率方法的不同细分为概率公式法和图表法,给出2种方法的使用说明.以长江三角洲地区某开发区为例,采用所提出的3种方法计算其A值,对计算结果进行可靠性验证,并对各计算方法的特点、适用情景进行了探讨.

关键词：大气环境容量 A—P值法单箱模型法达标保证率概率公式法图表法

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

柴油机曲轴断裂预报技术研究

引用

内燃机工程 2007年第3期28卷 35-40,44页

作者：易太连欧阳光耀向阳海军工程大学船舶与动力学院武汉430033 武汉理工大学能源与动力工程学院

运用理论计算和试验模态分析方法,对光轴和曲轴是否有裂纹的情况进行了分析,结果表明:当光轴或曲轴发生裂纹时,各阶固有频率均有明显变化;当裂纹位置一定时,裂纹越深,固有频率变化越大,其变化的绝对值可以在现场检测中识别。如作出各阶... 详细信息

运用理论计算和试验模态分析方法,对光轴和曲轴是否有裂纹的情况进行了分析,结果表明:当光轴或曲轴发生裂纹时,各阶固有频率均有明显变化;当裂纹位置一定时,裂纹越深,固有频率变化越大,其变化的绝对值可以在现场检测中识别。如作出各阶固有频率变化量随裂纹位置和深度分布的曲面,用试验中测出的固有频率变化量去截取各曲面,可得到多阶等高线曲线,将各等高线两两重叠,就可识别裂纹在轴上的位置和深度,并具有较高精度。

关键词：内燃机曲轴疲劳裂纹预报固有频率模态分析

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

开放与包容——对芝加哥大学理念的解读

引用

比较教育研究 2005年第8期26卷 7-12页

作者：欧阳光华教育部人文社会科学重点研究基地北京师范大学比较教育研究中心

大学理念是大学的精神与灵魂,对于大学的发展具有至关重要的作用。本文以被誉为“第一所美式大学”的芝加哥大学为视角,通过对芝加哥大学组织理念、研究理念和教学理念的阐述,对芝加哥大学走向世界一流大学的发展路径进行了探索,解析了... 详细信息

大学理念是大学的精神与灵魂,对于大学的发展具有至关重要的作用。本文以被誉为“第一所美式大学”的芝加哥大学为视角,通过对芝加哥大学组织理念、研究理念和教学理念的阐述,对芝加哥大学走向世界一流大学的发展路径进行了探索,解析了美式大学特有的文化品性。

关键词：芝加哥大学大学理念开放性包容性

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：