检索结果-南通市图书馆

Water source identification in mines combining LIF technology and ResNet

Journal of Mountain Science 2023年第11期20卷 3392-3401页

作者： YAN Peng-cheng ZHAO Yu-ting LI Guo-dong wang jing-bao wang Wen-chang State Key Laboratory of Deep Coal Mine Exploitation Response and Disaster Prevention Anhui University of Science andTechnologyHuainan 232001China School of Electrical and Information Engineering Anhui University of Science and TechnologyHuainan 232001China Collaborative Innovation Center of Mine Intelligent Equipment and Technology Anhui University of Science&TechnologyHuainan 232001China

The problem of mine water source has always been an important hidden danger in mine safety *** water source under the mine working face may lead to geological disasters,such as mine collapse and water *** research background of mine water source identification involves many fields such as mining production,environmental protection,resource utilization and technological *** is a comprehensive and interdisciplinary subject,which helps to improve the safety and sustainability of mine ***,timely and accurate identification and control of mine water source is very important to ensure mine production ***-Induced Fluorescence(LIF)technology,characterized by high sensitivity,specificity,and spatial resolution,overcomes the time-consuming nature of traditional chemical *** this experiment,sandstone water and old air water were collected from the Huainan mining area as original *** types of mixed water samples were prepared by varying their proportions,in addition to the two original water samples,resulting in a total of seven different water samples for *** preprocessing methods,namely,MinMaxScaler,StandardScaler,Standard Normal Variate(SNV)transformation,and Centering Transformation(CT),were applied to preprocess the original spectral data to reduce noise and *** was determined as the optimal preprocessing method based on class discrimination,data distribution,and data *** maintain the original data features while reducing the data dimension,including the original spectral data,five sets of data were subjected to Principal Component Analysis(PCA)and Linear Discriminant Analysis(LDA)dimensionality *** comparing the clustering effect and Fisher's ratio of the first three dimensions,PCA was identified as the optimal dimensionality reduction ***,two neural network models,CT+PCA+CNN and CT+PCA+ResNet,were constructed by combining Convolutional Neural Networks(

关键词： Water source identification Mine safety LIF technology CT PCA ResNet

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

Symmetries and Mei Conserved Quantities of Nonholonomic Controllable Mechanical Systems

引用

Communications in Theoretical Physics 2006年第3X期46卷 415-418页

作者： XIA Li-Li LI Yuan-Cheng wang jing HOU Qi-bao College of Physics Science and Technology China University of Petroleum Dongying 257061 China

This paper concentrates on studying the symmetries and a new type of conserved quantities called Mei conserved quantity. The criterions of the Mei symmetry, the Noether symmetry and the Lie symmetry are given. The conditions and the forms of the Mei conserved quantities deduced from these three symmetries are obtained. An example is given to illustrate the application of the result.

关键词： control nonholonomic mechanical system Mei symmetry Noether symmetry Lie symmetry conserved quantity

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

Unified Symmetry of Nonholonomic Mechanical Systems of Non-Chetaev＇s Type with Unilateral Constraints

引用

Communications in Theoretical Physics 2006年第6X期46卷 1081-1084页

作者： XIA Li-Li LI Yuan-Cheng wang jing HOU Qi-bao College of Physical Science and Technology China University of Petroleum Dongying 257061 China

The definition and the criterion for a unified symmetry of nonholonomic mechanical systems of non- Chetaev＇s type with unilateral constraints are presented based on the total time derivative along the trajectory of the system. A new conserved quantity, as well as the Noether conserved quantity and the Hojman conserved quantity, deduced froth the unified symmetry, is obtained. An example is given to illustrate the application of the results.

关键词： unilateral constraints nonholonomic mechanical system of non-Chetaev's type unified symmetry conserved quantity

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

Study on animals' femur blood flow alteration under inadequate decompression with ^(133)Xe isotope washout method

引用

Nuclear Science and Techniques 1998年第2期9卷 124-128页

作者： Yu Shao-Ning bao Bo-Rong (Shanghai Institute of Nuclear Research, the Chinese Academy of Sciences, Shanghai 201800 )Tian Wu-Xun Yun Chang-Quan Zhu Xiang-Qi wang jing-Ying and Cao bao-Gen (Naval Medical Research Institute, Shanghai 200433) Shanghai Institute of Nuclear Research Chinese Academy of Sciences Shanghai 201800 China Naval Medical Research Institute Shanghai 200433 China

Animals’ regional femur blood (F) alteration was studied under an inadequate decompression by using the inhaled isotope 133Xe washout method. Results showed that the average F on left and right side of minipigs’ femur decreased from 15.4±1.8 and 16 .9±2.0 ml/ (100 ***) (before exposure) to 10±1.8 and 11.1±1.6 ml/(***) (after expposure for 1.5 h under the pressure of 0.5 MPa and then decompression to normal with the rate of 0.03~0.04MPa/min), respectively; the blood flow of hematopoietic marrow tissues (f1)on both sides also decreased from 19.3±2.0 and 22.1±1.9 ml/(***) to 13.9±1.4 and 13.8±1.0 ml/(100 ***). The exact same alteration also happened in the experiment on New Zealand rabbits. It indicates that inadequate decompression in hyperbaric exposure can give rise to decrease animals’ bone blood flow and insufficient bone blood supply serves as one of the reasons for causing decompressive osteonecrosis.

关键词： 133Xe同位素动物股骨血液流减压

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

A Retrospective Study of 1526 Cases of Transcatheter Occlusion of Patent Ductus Arteriosus

引用

Chinese Medical Journal 2015年第17期128卷 2284-2289页

作者： Mei Jin Yong-Mei Liang Xiao-Fang wang bao-jing Guo Ke Zheng Yan Gu Zhen-Yu Lyu Department of Pediatric Cardiology Beijing Anzhen Hospital Capital Medical University Beijing 100029 China

Background： Patent ductus arteriosus （PDA） is one of the most common congenital heart diseases and began to get treated by transcatheter occlusion since 1997 in China. Since then, several devices have been invented for occluding PDA. This study aimed to evaluate the technical feasibility, safety, and efficacy of transcatheter occlusion of PDA with different devices. Methods： One thousand five hundred and twenty-six patients （537 boys, 989 girls） with PDA from January 1997 to September 2014 underwent descending aortogram and transcatheter occlusion procedure. We retrospectively analyzed data of these patients, including gender, age, weight, size and morphology of PDA, and devices used in transcatheter occlusion, outcomes, and postoperational complications. Results： Median age and median weight were 4.0 years （range： 0.3 5-2.0 years old） and 15.3 kg （range： 4.5-91.0 kg）, respectively. Mean ductal diameter, aortic ductal diameter, ductal length, and pulmonary artery pressure were 3.50 ± 2.15 mm, 10.08 ± 2.46 ram, 7.49 ± 3.02 mm, and 30.21 ± 17.28 mmHg, respectively. Morphology of PDA assessed by descending aortogram was of type A in 1428 patients, type B in 6 patients, type C in 79 patients, type D in 4 patients, and type E in 9 patients according to the classification of Krichenko. Of all the 1526 patients, 1497 patients underwent transcatheter PDA closure, among which 1492 were successful. Devices used were Amplatzer duct occluder I （ADO I, 1280, 85.8%）, Cook detachable coils （116, 7.8%）, ADO II （ADO II, 68, 4.6%）, muscular VSD occluder （12, 0.8%）, and Amplatzer vascular plug （16, 1.0%）. Conclusions： Excellent occlusion rates with low complication rates were achieved with all devices regardless of PDA types. With transcatheter occlusion technique and devices developing, more patients with PDA can be treated with transcatheter closure both safely and efficiently.

关键词： Congenital Heart Disease Devices Patent Ductus Arteriosus Transcatheter Occlusion

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

牙鲆、大黄鱼和小黄鱼不同部位鳞片类型的比较

引用

动物学杂志 2017年第5期52卷 850-856页

作者：王晶高磊鲍宝龙上海海洋大学水产种质资源发掘与利用教育部重点实验室海洋动物系统分类与进化上海高校重点实验室水产科学国家级实验教学示范中心上海201306

真骨鱼类的骨鳞有圆鳞和栉鳞两种类型,观察了大黄鱼(Larimichthys crocea)和小黄鱼(Pseudosciaena polyactis)成体的鳞片类型,发现同一个体同时存在圆鳞和栉鳞,有典型的圆鳞和栉鳞结构,也有两者的过渡型形态。而对100日龄和成体牙鲆(Par... 详细信息

真骨鱼类的骨鳞有圆鳞和栉鳞两种类型,观察了大黄鱼(Larimichthys crocea)和小黄鱼(Pseudosciaena polyactis)成体的鳞片类型,发现同一个体同时存在圆鳞和栉鳞,有典型的圆鳞和栉鳞结构,也有两者的过渡型形态。而对100日龄和成体牙鲆(Paralichthys olivaceus)不同部位鳞片类型的观察发现,100日龄牙鲆眼侧存在圆鳞向栉鳞过渡的Ⅲ型鳞片、Ⅳ型初始栉鳞和Ⅴ型典型栉鳞,而成体牙鲆有眼侧仅覆盖Ⅴ型典型栉鳞,推测栉鳞和圆鳞可能存在发育上的联系。通过统计大黄鱼和小黄鱼不同部位的圆鳞和栉鳞数量,发现二者体表栉鳞数量均为从头部到尾部依次减少,而背部与腹部之间没有明显差异。

关键词：圆鳞栉鳞牙鲆大黄鱼小黄鱼

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

Value of the Ratio of Occluder Versus Atrial Septal Length for Predicting Arrhythmia Occurrence after Transcatheter Closure in Children with Ostium Secundum Atrial Septal Defect

引用

Chinese Medical Journal 2015年第12期128卷 1574-1578页

作者： Mei Jin Wen-Hang Ding Xiao-Fang wang bao-jing Guo Yong-Mei Liang Yan-Yan Xiao Chu-Fan Sun Department of Pediatric Cardiology Beijing Anzhen Hospital Capital Medical University Beijing 100029 China

Background：Transcatheter occlusion has been applied to treat ostium secundum atrial septal defect （OS ASD） since *** the clinical practice,several postoperative complications including arrhythmia have been *** study aimed to evaluate the value of the ratio of atrial septal occluder （ASO） versus atrial septal length （ASL） for predicting arrhythmia occurrence after transcatheter closure in children with OS ***：Six hundred and fifty-one children diagnosed with OS ASD underwent occlusion procedures after completing routine *** onsets and types of arrhythmia both during and after the occlusion procedures were *** were given based on the individual types of *** binary logistic regression analysis and receiver-operating characteristic （ROC） curve were used in the analysis of value of the ratio of ASO/ASL for predicting postoperative arrhythmia ***：Transcather occlusions were conducted in 651 children,among whom 7 children had different types and degrees of arrhythmia,with an incidence of 1.1%.The types of arrhythmia included sinus bradycardia,atrial premature beats,bundle branch block,and different degrees of atrioventricular *** electrocardiograph findings were resumed in these 7 patients following active therapies such as corticoids,nutrition,and *** binary logistic regression and ROC analysis suggested that the ratio of ASO/ASL exhibited an intermediate predictive value for predicting arrhythmia occurrence after occlusion procedures.A cut-offvalue of 0.576 in the ratio provided a sensitivity of 87.5% and a specificity of 76.2% with an area under the ROC curve of 0.791 （95% confidence intervals,0.655-0.926;P 〈 0.05） in predicting arrhythmia occurrence after the closure ***：The ratio of ASO/ASL might be a useful index for predicting arrhythmia occurrence after closure procedures in children with OS ASD.

关键词： Arrhythmia Atrial Septal Defect Atrial Septal Length Atrial Septal Occluder Transcatheter Closure

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

Role of iron ore in enhancing gasification of iron coke:Structural evolution,influence mechanism and kinetic analysis

引用

International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 58-69页

作者： Jie wang Wei wang Xuheng Chen Junfang bao Qiuyue Hao Heng Zheng Runsheng Xu School of Chemistry and Materials Science Hubei Engineering UniversityXiaogan 432000China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081China Institue of Ironmaking Technology Baosteel Central Research InstituteShanghai 201999China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The utilization of iron coke provides a green pathway for low-carbon *** uncover the influence mechanism of iron ore on the behavior and kinetics of iron coke gasification,the effect of iron ore on the microstructure of iron coke was ***,a comparative study of the gasification reactions between iron coke and coke was conducted through non-isothermal thermogravimetric *** findings indicate that compared to coke,iron coke exhibits an augmentation in micropores and specific surface area,and the micropores further extend and *** provides more adsorption sites for CO_(2) molecules during the gasification process,resulting in a reduction in the initial gasification temperature of iron *** the heating rate in non-isothermal gasification can enhance the reactivity of iron *** metallic iron reduced from iron ore is embedded in the carbon matrix,reducing the orderliness of the carbon structure,which is primarily responsible for the heightened reactivity of the carbon *** kinetic study indicates that the random pore model can effectively represent the gasification process of iron coke due to its rich pore ***,as the proportion of iron ore increases,the activation energy for the carbon gasification gradually decreases,from 246.2 kJ/mol for coke to 192.5 kJ/mol for iron coke 15wt%.

关键词： low-carbon ironmaking iron coke gasification structural evolution kinetic model

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

Photocatalytic degradation kinetics and mechanism of pentachlorophenol based on superoxide radicals

引用

Journal of Environmental Sciences 2011年第11期23卷 1911-1918页

作者： Yang Li,Junfeng Niu,Lifeng Yin,Wenlong wang,Yueping bao,jing Chen,Yanpei Duan State Key Laboratory of Water Environment Simulation,School of Environment,Beijing Normal University,Beijing 100875,China State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing 100875 China

The micron grade multi-metal oxide bismuth silicate (Bi 12 SiO 20,BSO) was prepared by the chemical solution decomposition *** degradation of pentachlorophenol (PCP) was investigated in the presence of BSO under xenon lamp *** reaction kinetics followed pseudo first-order and the degradation ratio achieved 99.1% after 120 min at an initial PCP concentration of 2.0 mg/*** pH decreased from 6.2 to 4.6 and the dechlorination ratio was 68.4% after 120 min at an initial PCP concentration of 8.0 mg/*** results of electron spin resonance showed that superoxide radical (O 2 · ) was largely responsible for the photocatalytic degradation of ***,this result was different from that of previous photocatalytic reactions where valence band holes or hydroxyl radicals played the role of major *** aromatic compounds and aliphatic carboxylic acids were determined by GC/MS as the reaction intermediates,which indicated that O 2 · can attack the bond between the carbon and chlorine atoms to form less chlorinated aromatic *** aromatic compounds were further oxidized by O 2 · to generate aliphatic carboxylic acids which can be finally mineralized to CO 2 and H 2 O.

关键词： photocatalytic degradation pentachlorophenol bismuth silicate superoxide radicals reaction mechanisms

来源：

同方期刊数据库评论

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AMR-WB编解码器的移动网络话音传输抗丢包算法

引用

北京理工大学学报 2016年第10期36卷 1048-1052页

作者：王晶刘宝光费泽松张剑寅北京理工大学信息与电子学院北京100081 中国移动通信集团公司研究院北京100053

针对移动通信网络中AMR-WB编解码器在话音分组传输中的抗丢包问题,提出了一种与VoLTE系统中语音编码速率相匹配的AMR-WB抗丢包实现方案.通过实验分析AMR-WB编解码器中经过错误隐藏恢复的各个参数对语音质量的影响,利用多描述编码(multip... 详细信息

针对移动通信网络中AMR-WB编解码器在话音分组传输中的抗丢包问题,提出了一种与VoLTE系统中语音编码速率相匹配的AMR-WB抗丢包实现方案.通过实验分析AMR-WB编解码器中经过错误隐藏恢复的各个参数对语音质量的影响,利用多描述编码(multiple description coding,MDC)技术设计了AMR-WB抗丢包方案,并进一步结合删余卷积编码提出了双重差错保护的增强型抗丢包算法,实现了多码率下的差错保护和速率匹配,该方案可兼容原有AMR-WB编码模式下的语音编码速率.仿真结果表明,提出的新方案能够增强AMR-WB的抗丢包能力,并且不需要增加额外的信令开销,兼容现有系统网络中的多速率语音编码.

关键词： AMR-WB MDC 删余卷积编码移动网络

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：