检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

在部分观测环境下的不确定动作模型学习

软件学报 2014年第1期25卷 51-63页

作者：饶东宁蒋志华姜云飞广东工业大学计算机学院广东广州510090 暨南大学信息科学与技术学院计算机科学系广东广州510632 中山大学信息科学与技术学院软件研究所广东广州510275

近年来,动作模型学习引起了研究人员的极大兴趣.可是,尽管不确定规划已经研究了十几年,动作模型学习的研究仍然集中于经典的确定性动作模型上.提出了在部分观测环境下学习不确定动作模型的算法,该算法可应用于假定人们对转移系统一无所... 详细信息

近年来,动作模型学习引起了研究人员的极大兴趣.可是,尽管不确定规划已经研究了十几年,动作模型学习的研究仍然集中于经典的确定性动作模型上.提出了在部分观测环境下学习不确定动作模型的算法,该算法可应用于假定人们对转移系统一无所知的情形下进行,输入只有动作-观测序列.在现实世界中,这样的场景很常见.致力于动作是由简单逻辑结构组成的、且观测以一定频率出现的一类问题的研究.学习过程分为3个步骤:首先,计算命题在状态中成立的概率;然后,将命题抽取成效果模式,再抽取前提;最后,对效果模式进行聚类以去除冗余.在基准领域上进行的实验结果表明,动作模型学习技术可推广到不确定的部分观测环境中.

关键词：人工智能自动规划动作模型学习不确定动作部分观测

新型胃肠道机器人无线能量传输系统的设计与实现

在线全文

学校读者我要写书评

暂无评论

上海交通大学学报 2022年第8期56卷 1057-1066页

作者：付文浩姜萍萍颜国正彭羽其费倩庄浩宇上海交通大学电子信息与电气工程学院上海200240 上海交通大学上海智慧戒毒与康复工程技术研究中心上海200240

为确保微型胃肠道机器人在人体内部稳定运行,研制了一种新型无线供能系统.该系统基于电磁场谐振原理,参考电磁场理论计算和纺锤形三维接收线圈模型的优化结果,并创新性地结合了肠道机器人的工作能耗、姿态稳定性、供能稳定性、尺寸设计... 详细信息

为确保微型胃肠道机器人在人体内部稳定运行,研制了一种新型无线供能系统.该系统基于电磁场谐振原理,参考电磁场理论计算和纺锤形三维接收线圈模型的优化结果,并创新性地结合了肠道机器人的工作能耗、姿态稳定性、供能稳定性、尺寸设计等要求.其中,发射线圈采用4组螺线管线圈产生均匀交变磁场,优化后的发射线圈通过与集成于肠道机器人内部的接收线圈互感,可产生稳定大于500 mW的能量用于机器人工作.经过相关实验验证,该无线供能系统的性能满足机器人在肠道内复杂环境的工作需求.

关键词：无线能量传输三维接收线圈组合螺线管式发射线圈

The MING proposal at SHINE:megahertz cavity enhanced X‑ray generation

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

Nuclear Science and Techniques 2023年第1期34卷 51-85页

作者： Nan‑Shun Huang Zi‑peng Liu Bang‑Jie Deng Zi‑Han Zhu Shao‑Hua Li Tao Liu Zheng Qi Jia‑Wei Yan Wei Zhang Sheng‑Wang Xiang Yang‑Yang Lei Ya Zhu Yong‑Zhou He Qi‑Bing Yuan fei Gao Rong‑Bing Deng Sen Sun Zhi‑Di Lei Zhi‑Qiang jiang Meng‑Qi Duan Yuan Zhuan Xue‑Fang Huang peng‑Cheng Dong Zhong‑Liang Li Shang‑Yu Si Lian Xue Si Chen Yong‑Fang Liu Ya‑Jun Tong Hai‑Xiao Deng Zhen‑Tang Zhao Zhangjiang Laboratory Shanghai 201210China School of Nuclear Science and Technology Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China European XFEL Schenefeld 22869Germany ShanghaiTech University Shanghai 201210China

The cavity-based X-ray free-electron laser(XFEL)has promise in producing fully coherent pulses with a bandwidth of a few meV and very stable intensity,whereas the currently existing self-amplified spontaneous emission(SASE)XFEL is capable of generating ultra-short pulses with chaotic *** general,a cavity-based XFEL can provide a spectral brightness three orders of magnitude higher than that of the SASE mode,thereby opening a new door for cutting-edge scientific *** the development of superconducting MHz repetition-rate XFEL facilities such as FLASH,European-XFEL,LCLS-II,and SHINE,practical cavity-based XFEL operations are becoming increasingly *** this study,megahertz cavity enhanced X-ray generation(MING)is proposed based on China’s first hard XFEL facility-SHINE,which we refer to as MING@SHINE.

关键词： X-ray free-electron laser Free electron laser oscillator Fully coherent X-ray

在线全文

学校读者我要写书评

暂无评论

大学学术秩序在现代大学制度中的合法性

辽宁教育研究 2006年第1期 22-26页

作者：彭江四川外语学院重庆400031

大学学术秩序是现代大学制度研究的重要课题。这种重要性基于三种合法性来源:第一,基于高等教育制度转型所产生的“大学学术秩序问题”的实践合法性;第二,基于逻辑关系的理论合法性;第三,基于自由、知识、制衡等“功能”的价值合法性。... 详细信息

大学学术秩序是现代大学制度研究的重要课题。这种重要性基于三种合法性来源:第一,基于高等教育制度转型所产生的“大学学术秩序问题”的实践合法性;第二,基于逻辑关系的理论合法性;第三,基于自由、知识、制衡等“功能”的价值合法性。因此,必须加强大学学术秩序的研究。

关键词：大学学术秩序现代大学制度合法性

在线全文

学校读者我要写书评

暂无评论

大学学术研究的“制度悖论”

教育与职业 2009年第32期 5-7页

作者：彭江四川外语学院高教研究所四川外语学院评建办公室

我国大学学术研究制度建设中出现了大量与学术研究的根本目的和利益不合或相悖的＂制度悖论＂,如学术自由的缺乏、学术机构的科层化、学术权力的异化、学术资源配置的非契约性等。导致我国大学学术研究制度出现＂制度悖论＂的最大原因... 详细信息

我国大学学术研究制度建设中出现了大量与学术研究的根本目的和利益不合或相悖的＂制度悖论＂,如学术自由的缺乏、学术机构的科层化、学术权力的异化、学术资源配置的非契约性等。导致我国大学学术研究制度出现＂制度悖论＂的最大原因在于制度选择的初始条件的敏感性及其累积效应——路径依赖,鉴于我国学术体制的特殊性,打破大学学术研究制度的路径依赖最有效的办法是制度变迁的＂路径替代＂——通过政府的强制力量进行制度变迁。

关键词：大学学术研究制度悖论

Surface decoration prompting the decontamination of active sites in high-temperature proton exchange membrane fuel cells

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第11期35卷 549-553页

作者： Jiaqi Lin Pupu Yang Yimin jiang Shiqian Du Dongcai Zhang Gen Huang Jinbo Wang Jun Wang Qie Liu Miaoyu Li Yujie Wu peng Long Yangyang Zhou Li Tao Shuangyin Wang Research Institute of Hunan University in Chongqing Chongqing 401120China College of Chemistry and Chemical Engineering Jiangxi Science and Technology Normal UniversityNanchang 330013China KBC Hydrogen Energy Technology Co. Ltd.Yiyang 413100China

In electrochemical energy devices,the operating conditions always exert enormous influence on electrocatalysts'*** acid(PA),acted as the proton carriers,can be adsorbed on Pt surface,block active sites and affect the electronic structure of Pt unfavorably,which severely restricts the performance of high-temperature proton exchange membrane fuel cells(HT-PEMFCs).Herein,simply basic organic compounds,such as dicyandiamide(DCD),melamine(Mel)and cyanuric acid(CA),are decorated on Pt surface(DCD-Pt/C,Mel-Pt/C and CA-Pt/C)to induce the adsorption transfer of proton *** decoration can not only inject electrons to Pt and enhance oxygen reduction reaction(ORR)activity but also can induce PA to transfer from Pt surface to organic compounds,decontaminating active *** addition,the organic compounds with the larger conjugated system and the smaller electronegativity of ligating atoms would have a greater interaction with Pt,causing a larger decoration amount on Pt surface,which leads to more excellent ORR activity and resistance to PA blockage ***,MelPt/C shows a peak power density of 629 mW/cm^(2),exceeding commercial Pt/C(437 mW/cm^(2)),DCD-Pt/C(539 m W/cm^(2))and CA-Pt/C(511 mW/cm^(2))with the same loading.

关键词： High-temperature proton exchange membrane fuel cells Decontamination of active sites Oxygen reduction reaction Surface decoration Adsorption transfer

The Dynamic Characteristics of Strain Fields and Crustal Movement before the Wenchuan Earthquake (M_S=8.0)

在线全文

学校读者我要写书评

暂无评论

Earthquake Research in China 2009年第3期23卷 257-265页

作者： jiang Zaisen Wu Yanqiang Fang Ying Li peng Wang Wuxing Institute of Earthquake Science CEA Beijing 100036 China

In this paper, we analyze the crustal movements, strain field changes and large scale dynamic characteristics of horizontal deformation before the Wenchuan earthquake （ Ms = 8.0） using GPS data obtained from the Crustal Movement Observation Network of China. The following issues are discussed. First, the strain fields of the Longmeushan fault zone located at the epicenter show slow accumulation, because of the tectonic dynamics process subjected to the eastward movement of the Bayan Har block. Second, the different movements between the Longmenshan fault and South China block are smaller than the errors of GPS observation. Third, the high value of compressive strain （2004 - 2007） is located at the epicenter, which shows that the local squeezing action is stronger than before. Fourth, the data from GPS reference stations in the Chinese Mainland show that crustal shortening is faster than before in the north-eastern direction, which is part of the background of the local tectonic dynamics increase in the Longmenshan fault zone.

关键词： Wenchuan earthquake ( Ms = 8.0 ) GPS Crustal movement Strain field Tectonic dynamics background

Proteins induced by telomere dysfunction are associated with human IgA nephropathy

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2014年第6期15卷 566-574页

作者： Ying-ying LU Xian YANG Wen-qing CHEN Zhen-yu JU Zhang-fei SHOU Juan JIN Xiao-hui ZHANG jiang-hua CHEN Hong jiang Kidney Disease Center the First Affiliated Hospital School of Medicine Zhejiang University Institute of Aging Research and Max-Planck-Research Group on Stem Cell Aging Hangzhou Normal University

Aging is one of the contributing risk factors for kidney diseases. Accumulating evidence prompts the view that telomere length in kidney tissue cells is an indicator for organismal aging. Previously identified aging markers （cathelin-related antimicrobial peptide （CRAMP）, stathmin, elongation factor-1α （EF-1α）, and chitinase） were associated not only with telomere driven aging in mice but also with human aging and chronic diseases. This study focuses on the relationship between these biomarkers and IgA nephropathy （IgAN） progression in the Chinese population. For 260 individuals, the four markers are determined in blind datasets using direct enzyme-linked immunosorbent assay （ELISA） and immunofluorescence staining. The expression levels of CRAMP and chitinase increased in blood plasma, urine, and kidney tissues during human IgAN progression. And for the other nephropathy, such as systemic lupus erythematosus （SLE）, diabetic nephropathy （DN）, and focal segmental glomerulosclerosis （FSGS）, there is no protein upregulaUon with telomere shortening. Moreover, a combination of CRAMP and chitinase can distinguish patients with IgAN from healthy individuals with 88.2%/92.5% （plasma） and 74.3%/84.2% （urine） sensitivity/specificity. These data provide the experimental evidence that telomere shortening and related inflammatory proteins are associated with human IgAN, and it could be a new direction for the disease progression study.

关键词： Biomarkers Telomere IgA nephropathy (IgAN)

高温高压下方解石相转变的拉曼光谱原位实验研究

在线全文

学校读者我要写书评

暂无评论

光谱学与光谱分析 2012年第2期32卷 378-382页

作者：刘川江郑海飞北京大学造山带与地壳演化教育部重点实验室

用热液金刚石压腔装置结合拉曼光谱技术研究了高温高压下方解石的相变过程及拉曼光谱特征。结果表明:常温条件下,体系压力增至1 666和2 127 MPa时,方解石的拉曼特征峰155cm-1消失,1 087cm-1峰分裂为1 083和1 090cm-1两个谱峰、282cm-1... 详细信息

用热液金刚石压腔装置结合拉曼光谱技术研究了高温高压下方解石的相变过程及拉曼光谱特征。结果表明:常温条件下,体系压力增至1 666和2 127 MPa时,方解石的拉曼特征峰155cm-1消失,1 087cm-1峰分裂为1 083和1 090cm-1两个谱峰、282cm-1峰突然降至231cm-1,证明其转变为方解石-Ⅱ和方解石-Ⅲ。在起始压力为2 761MPa和低于171℃的升温过程中,方解石-Ⅲ的拉曼散射的各个特征振动峰没有变化。当温度达到171℃,方解石晶体完全变成不透明状,其对称伸缩振动峰1 087cm-1、面内弯曲振动峰713cm-1和晶格振动峰155和282cm-1均发生突变,说明方解石-Ⅲ相变生成一种碳酸钙新相。体系降至常温,该新相一直保持稳定不变,表明高温高压下方解石向碳酸钙新相的转变过程是不可逆的。方解石-Ⅲ与碳酸钙新相之间的相变线方程为P(MPa)=9.09.T(℃)+1 880。碳酸钙新相的对称伸缩振动峰(ν1 087)随压力、温度的变化率分别为dν/dP=5.1(***-1),dν/dT=-0.055 3(cm-1.℃-1)。

关键词：高温高压方解石金刚石压腔拉曼光谱相变