检索结果-南通市图书馆

The Explicit Solution to Equation AX ＋ X B = C in Matrices

在线全文

学校读者我要写书评

暂无评论

Chinese Quarterly Journal of Mathematics 2009年第4期24卷 516-524页

作者： YOU Xing-hua MA sheng-rong YAN shi-jian Department of Basic Courses Nanjing Institute of Technology Nanjing 211167 China Department of Mathematics Nanjing Xiaozhuang College Nanjing 210017 China College of Mathematics and Computer Science Nanjing Normal University Nanjing 210097 China

Abstract： At first one of g-inverses of A （×） In＋Im（×） BT is given out, then the explicit solution to matrix equation AX ＋ XB = C is gained by using the method of matrix decomposition, finally, a numerical ex... 详细信息

关键词： matrix equation g-inverse explicit solution formulae Jordan canonical form 2000 MR Subject Classification: 15A24, 65F10

在线全文

学校读者我要写书评

暂无评论

新生血管性青光眼治疗的研究进展

国际眼科杂志 2019年第10期19卷 1685-1687页

作者：何之城姜波王勇史春生安徽省第二人民医院眼科

新生血管性青光眼(neovascular glaucoma,NVG)是一种难治性致盲性眼病,给社会增加了沉重负担。NVG的发病与多种因素有关,如视网膜缺血缺氧、炎症及外伤等。可引发其发病的疾病多达40余种,其中临床中最常见的为糖尿病视网膜病变及视网膜... 详细信息

新生血管性青光眼(neovascular glaucoma,NVG)是一种难治性致盲性眼病,给社会增加了沉重负担。NVG的发病与多种因素有关,如视网膜缺血缺氧、炎症及外伤等。可引发其发病的疾病多达40余种,其中临床中最常见的为糖尿病视网膜病变及视网膜中央静脉阻塞等。由于其病因复杂,且发病机制仍不明确,临床治疗存在巨大难度。本文对近年来的一些相关研究进行归纳总结,对NVG的发病及治疗进行阐述,以期望可以对临床工作有所帮助。

关键词：新生血管性青光眼糖尿病视网膜病变视网膜中央静脉阻塞炎症

Distribution of donor states on the surface of AlGaN/GaN heterostructures

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第12期30卷 620-624页

作者： Yue-Bo Liu Hong-Hui Liu Jun-Yu Shen Wan-Qing Yao Feng-Ge Wang Yuan Ren Min-Jie Zhang zhi-sheng Wu Yang Liu Bai-Jun Zhang School of Electronics and Information Technology Sun Yat-sen UniversityGuangzhou 510006China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen UniversityGuangzhou 510275China

The uniform distribution model of the surface donor states in AlGaN/GaN heterostructures has been widely used in the theoretical calculation.A common and a triple-channel AlGaN/GaN heterostructure Schottky barrier diodes have been fabricated to verify the models,but the calculation results show the uniform distribution model can not provide enough electrons to form three separate 2DEGs in the triple-channel Al GaN/GaN *** experiments indicate the uniform distribution model is not quite right,especially for the multiple-channel AlGaN/GaN ***,it is found the exponential distribution model possibly matches the actual distribution of the surface donor states better,which allows the 2DEG to form in each channel structure during the *** exponential distribution model would be helpful in the research field.

关键词： AlGaN/GaN surface states exponent distribution

A Mothed of Improving Identification Accuracy via Deep Learning Algorithm under Condition of Deficient Labeled Data 36

在线全文

学校读者我要写书评

暂无评论

A Mothed of Improving Identification Accuracy via Deep Learn...

第36届中国控制会议

作者： Jian-Guo Wang zhi-Duo Cao Bang-Hua Yang shi-Wei Ma Min-Rui Fei Hao Wang Yuan Yao Tao Chen Xiao-Fei Wang School of Mechatronical Engineering and Automation Shanghai UniversityShanghai Key Lab of Power Station Automation Technology Department of Chemical Engineering “Tsing-Hua University” Department of Chemical and Process Engineering University of Surrey Shanghai Zhenhua Heavy Industries Company Limited

ISBN: (纸本)9781538629185

In industrial process, some important variables such as quality index, efficiency index and concentration of product components are difficult or even impossible to be measured directly due to the limitation of technology. This phenomenon leads to few labeled data and plenty of unlabeled data. Traditional identification method for controlled auto regressive（CAR） model usually cannot deal with unlabeled training data. As a result, these traditional identification methods may receive poor identification precision or even cannot work entirely. To solve the problems above, this paper proposes a new identification method based on deep learning（DL）. Firstly, the CAR model is transformed into finite impulse response（FIR） model solve the problem of lack of autoregressive part;Secondly, autoencoder of deep learning make full use of unlabeled data to pretrain the model;Thirdly, small amount of label data is used for fine-tuning. As a semi-supervised learning method, deep learning can be able to extract more information from unlabeled data than traditional supervised learning method. The results show that the proposed method can acquire higher identification accuracy than BP neural network.

关键词： System Identification Deep Learning Controlled Auto Regressive Finite Impulse Response

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

论智能

计算机科学 2005年第6期32卷 109-110,F004页

作者：史俊史忠植中科院计算所智能信息处理重点实验室

信息化的必然趋势是智能化,智能革命将开创人类后文明史。图灵测试、物理符号假设等对智能研究的发展起了积极的推动作用。掌上电脑的先驱者霍金斯的新书On Intelligence(论智能)闯进了人工智能的领域并使该领域萌生新机。新书提出了对... 详细信息

信息化的必然趋势是智能化,智能革命将开创人类后文明史。图灵测试、物理符号假设等对智能研究的发展起了积极的推动作用。掌上电脑的先驱者霍金斯的新书On Intelligence(论智能)闯进了人工智能的领域并使该领域萌生新机。新书提出了对人脑的新理解,将可能导致创建真正的智能机器,关键是机器智能需要神经科学。智能科学主张智能的研究不仅要在功能上模拟自然智能,而且要进行机理的研究,提出智能研究的新思路。

关键词：图灵测试推动作用掌上电脑人工智能智能机器神经科学机器智能智能科学智能化信息化领域并新思路人脑

轮轨激励下高速列车头车乘客室室内的声学响应研究

在线全文

学校读者我要写书评

暂无评论

振动与冲击 2009年第1期28卷 95-98页

作者：时彧肖友刚康志成湖南科技大学机电工程学院湖南湘潭411201 中南大学轨道交通安全教育部重点实验室长沙410075 井冈山大学工学院江西吉安343009

建立了某高速列车头车-轨道的耦合动力学仿真模型、车身的有限元模型、乘客室的声学边界元模型,计算出了由轨道不平顺引起的乘客室内的噪声分布状况,得出了如下结论:当列车运行速度为200 km/h时,乘客室内的A声级在61.9 dBA^69.6 dBA之... 详细信息

建立了某高速列车头车-轨道的耦合动力学仿真模型、车身的有限元模型、乘客室的声学边界元模型,计算出了由轨道不平顺引起的乘客室内的噪声分布状况,得出了如下结论:当列车运行速度为200 km/h时,乘客室内的A声级在61.9 dBA^69.6 dBA之间变化;乘客室内A声级较大的场点在40 Hz、200 Hz频率处的声压级较大;要降低乘客室内的噪声,必须对总声级起决定作用的频率段(40 Hz、200 Hz)采取措施。针对40 Hz的低频噪声,最好修改乘客室的底部结构或采取减振措施,以减少底板的振动幅度;针对200 Hz的中频噪声,则宜在声学贡献最大的面板上采取阻尼降噪措施。

关键词：高速列车轮轨激励乘客室声学响应

Dry sliding wear of MA/PM Al-10Ti alloy

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2001年第2期11卷 270-274页

作者：吴进明郑史烈曾跃武李志章浙江大学材料系浙江杭州 310027

Dry sliding wear behaviors of the Al 10Ti alloy prepared by mechanical alloying (MA) were investigated and compared with those of the alloy obtained by the rapid solidification (RS) process. The results show that, under low sliding velocity of 0.66 m/s and low applied load, the predominant wear mechanism of Al 10Ti alloy against carbon steel is adhesion. The fine dispersing reinforcement in the alloy promotes the nucleation and propagation of cracks on the subsurface, leading to a higher wear rate of MA Al 10Ti alloy, compared with that of RS Al 10Ti alloy. With increasing normal load, the formation and spallation of transfer layers on the worn surface become the predominant wear mechanism. Therefore, the wear resistance of the alloy obtained by MA surpasses that achieved by RS due to the higher strength at both ambient and elevated temperature. The wear transfer layer of the MA Al 10Ti alloy is determined to be consisted mainly of Fe 2O 3 and metal Fe. [

关键词： Al-Ti alloy sliding wear mechanical alloying rapid solidification(RS)

桩土相互作用阻尼系数试验结果与其他结果的对比

在线全文

学校读者我要写书评

暂无评论

中国港湾建设 2010年第3期30卷 34-38页

作者：智胜英天津港建设公司天津300461

当前如何考虑桩土之间的相互作用并将其定量化是限制基桩缺陷定量分析方法准确性的重要因素。低应变条件下将土对桩的作用以粘滞阻尼器考虑,通过桩土相互作用试验测定桩顶速度响应并结合理论分析结果确定桩侧土在不同状态下的桩土相互... 详细信息

当前如何考虑桩土之间的相互作用并将其定量化是限制基桩缺陷定量分析方法准确性的重要因素。低应变条件下将土对桩的作用以粘滞阻尼器考虑,通过桩土相互作用试验测定桩顶速度响应并结合理论分析结果确定桩侧土在不同状态下的桩土相互作用阻尼系数。在现有的一些研究中也有一些其他确定阻尼系数的方法,例如经过动力平衡分析得到桩侧土单位长度阻尼系数的理论表达式,实际测定表达式中各个参数即可确定相应阻尼系数;也有通过多次动静对比试验得到的阻尼系数经验值。由于各个阻尼系数定义并不相同,参考试验时的实际情况确定各个参数,进而将不同定义的阻尼系数转化为同一量纲,分析了不同阻尼系数的差距,发现通过多次动静对比试验得到的Case阻尼系数由于是在大应变情况下得到的,相对桩土相互作用试验得到的阻尼系数有较大差距,应用于低应变分析并不合适。而理论推导得到的阻尼系数相对试验结果虽然并不一致,但是他们之间存在一定的相关性,进而经过拟合分析发现两者之间的比值可以表示为剪切波速的函数。

关键词：桩土相互作用阻尼系数低应变拟合分析

Intra-operative mapping and language protection in glioma

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2021年第20期134卷 2398-2402页

作者： shi-Meng Weng sheng-Yu Fang Lian-Wang Li Xing Fan Yin-Yan Wang Tao Jiang Beijing Neurosurgical Institute Capital Medical UniversityBeijing 100070China Department of Neurosurgery Beijing Tiantan HospitalCapital Medical UniversityBeijing 100070China Research Unit of Accurate Diagnosis Treatmentand Translational Medicine of Brain TumorsChinese Academy of Medical SciencesBeijing 100070China

The demand for acquiring different languages has increased with increasing ***,knowledge of the modification of the new language in the neural language network remains *** many details of language function have been detected based on the awake intra-operative mapping results,the language neural network of the bilingual or multilingual remains unclear,which raises difficulties in clinical practice to preserve patients’full language ability in *** this review,we present a summary of the current findings regarding the structure of the language network and its evolution as the number of acquired languages increased in glioma *** then discuss a new insight into the awake intra-operative mapping protocol to reduce surgical risks during the preservation of language function in multilingual patients with glioma.

关键词： Glioma Intra-operative mapping Language function Language protection