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

采用低维特征映射的耳语音向正常音转换

声学学报 2018年第5期43卷 855-863页

作者：周健窦云峰刘荣敏王华彬陶亮安徽大学计算智能与信号处理教育部重点实验室合肥230039 安徽大学媒体计算研究所合肥230601

在将耳语音转换为正常音时,为了研究降维后语音特征对耳语音转换的影响,分别对耳语音和正常音谱包络进行自适应编码以提取耳语音和正常音的低维特征,然后使用BP网络建立耳语音和正常音低维谱包络特征之间的映射关系以及正常音基频和耳... 详细信息

在将耳语音转换为正常音时,为了研究降维后语音特征对耳语音转换的影响,分别对耳语音和正常音谱包络进行自适应编码以提取耳语音和正常音的低维特征,然后使用BP网络建立耳语音和正常音低维谱包络特征之间的映射关系以及正常音基频和耳语音低维谱包络特征之间的关系。转换时,根据耳语音低维谱包络特征获得对应正常音的低维谱包络特征和基频,对低维谱包络特征进行解码后获得对应的正常音谱包络。实验结果表明,采用此方法转换后的语音与正常音之间的倒谱距离相比高斯混合模型方法下降了10%,转换后语音的自然度和可懂度都有所提高。

关键词：特征映射耳语音低维高斯混合模型语音转换谱包络自适应编码映射关系

无心车床空心主轴系统振动特性分析及结构优化

在线全文

学校读者我要写书评

暂无评论

机械科学与技术 2017年第9期36卷 1375-1380页

作者：史丽晨贠志达王海涛杜小渊皇甫云峰豆卫涛西安建筑科技大学机电工程学院西安710055 西安永电电气有限责任公司西安710016 西部超导材料科技股份有限公司西安710018

利用Pro/E建立了空心主轴单元的三维模型,采用ANSYS对空心主轴单元进行了振动特性分析。通过在空心主轴上选取的6个关键节点,并取前轴承不同位置,对比分析不同前轴承位置时的固有频率及相应6节点处的振动特性,得到如下结论:刀具和调刀... 详细信息

利用Pro/E建立了空心主轴单元的三维模型,采用ANSYS对空心主轴单元进行了振动特性分析。通过在空心主轴上选取的6个关键节点,并取前轴承不同位置,对比分析不同前轴承位置时的固有频率及相应6节点处的振动特性,得到如下结论:刀具和调刀套节点处的振动对棒材加工精度影响最大,并在此基础上对空心主轴结构进行优化,提高了加工精度。

关键词：无心车床空心主轴单元 ANSYS 振动特性分析结构优化

Oxidation of Diesel Soot by Several Rear Earth Catalysts with Different Atmosphere

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2004年第Z1期22卷 157-159页

作者： dou Lixin Liu Jiandong Shen Jian Gong Tianping Lü Zhenjian Wei yunfeng Center of Research on Surface and Interface Chemical Engineering and Technology Nanjing UniversityNanjing 210093 China Engineering College PLA University of Science and Technology Nanjing 210007China Engineering College PLA University of Science and Technology Nanjing 210007China Center of Research on Surface and Interface Chemical Engineering and Technology Nanjing UniversityNanjing 210093 China College of Chemistry and Environment Science Nanjing Normal University Nanjing 210097 China Engineering College PLA University of Science and Technology Nanjing 210007China Engineering College PLA University of Science and Technology Nanjing 210007China Engineering College PLA University of Science and Technology Nanjing 210007China

Diesel soot is related to incomplete fuel oxidation, and possesses the well-known mutagenic effects on human *** soot was collected from diesel engines and oxidized in laboratorial micro reactor by several prepared rare earth-based catalysts with or without different harmful monoxide gases such as NO, and activities of several rare earth catalysts were *** results indicate that soot can be more easily oxidized with monoxide gases.

关键词： diesel soot rare earth catalyst oxidation monoxide gas

Applications of tetrahedral DNA nanostructures in wound repair and tissue regeneration

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

Burns & Trauma 2022年第1期10卷 685-698页

作者： Yikai dou Weitong Cui Xiao Yang yunfeng Lin Xiaohong Ma Xiaoxiao Cai State Key Laboratory of Oral Diseases National Clinical Research Center for Oral DiseasesWest China Hospital of StomatologySichuan UniversityChengdu610041China Psychiatric Laboratory and Mental Health Center West China Hospital of Sichuan UniversityChengduSichuan610064China Psychiatric Laboratory and Mental Health Center the State Key Laboratory of BiotherapyWest China Hospital of Sichuan UniversityChengdu610041China

Tetrahedral DNA nanostructures(TDNs)are molecules with a pyramidal structure formed by folding four single strands of DNA based on the principle of base *** DNA has polyanionic properties,the special spatial structure of TDNs allows them to penetrate the cell membrane without the aid of transfection agents in a caveolin-dependent manner and enables them to participate in the regulation of cellular processes without obvious toxic side *** of their stable spatial structure,TDNs resist the limitations imposed by nuclease activity and innate immune responses to *** addition,TDNs have good editability and biocompatibility,giving them great advantages for biomedical *** studies have found that TDNs have a variety of biological properties,including promoting cell migration,proliferation and differentiation,as well as having anti-inflammatory,antioxidant,anti-infective and immune regulation ***,we confirmed that TDNs can promote the regeneration and repair of skin,blood vessels,muscles and bone *** on these findings,we believe that TDNs have broad prospects for application in wound repair and *** article reviews recent progress in TDN research and its applications.

关键词： Tetrahedral DNA nanostructures Wound treatment Injury repair Injury regeneration Tissue regeneration

Effect of tetrahedral DNA nanostructures on LPS-induced neuroinflammation in mice

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

Chinese Chemical Letters 2022年第4期33卷 1901-1906页

作者： Xiao Yang Fan Zhang Yue Du Weitong Cui Yikai dou yunfeng Lin Zhihe Zhao Xiaohong Ma Psychiatric Laboratory and Mental Health Center West China Hospital of Sichuan UniversityChengdu 610041China State Key Laboratory of Oral Diseases National Clinical Research Center for Oral DiseasesWest China Hospital of StomatologySichuan UniversityChengdu 610041China Physical Examination Center West China HospitalSichuan UniversityChengdu 610041China College of Biomedical Engineering Sichuan UniversityChengdu 610041China

Neuroinflammation plays a significant role in inducing depression-like behavior. Tetrahedral DNA nanostructures(TDNs) are molecules that exhibit anti-inflammatory properties and can effectively penetrate the blood-brain barrier. Thus, researchers have hypothesized that TDNs regulate the secretion of proinflammatory cytokines and consequently alleviate depression-like behavior. To test this hypothesis, we investigated the effect of TDNs on the depression-like behavior of C57 mice induced by lipopolysaccharide(LPS). We performed open-field, tail suspension, and sucrose preference tests on LPS-and LPS/TDNtreated mice. The results indicated that the injection of TDNs into LPS-treated mice resulted in increased velocity, center zone duration, frequency to the center zone, and sucrose preference, and decreased immobility time. Immunofluorescence results indicated that peripheral administration of LPS in the mice activated inflammation, which culminated in distinct depression-like behavior. However, TDNs effectively alleviated the inflammation and depression-like behavior through the reduction of the expression levels of proinflammatory cytokines, such as interleukin-1β and tumor necrosis factor-α in the brain. Additionally, TDNs normalized the expression level of microglia cell activation markers, such as ionized calcium binding adaptor molecule 1, in the hippocampus of mice. These results indicated that TDNs attenuated the LPS-induced secretion of inflammatory factors and consequently alleviated depression-like behavior.

关键词： Tetrahedral DNA nanostructures Lipopolysaccharide Depression-like behavior Proinflammatory cytokine Microglia cell

Comparative Identification between Kadsura coccinea and Kadsura heteroclite

在线全文

学校读者我要写书评

暂无评论

Medicinal Plant 2020年第2期11卷 69-72页

作者： Xincheng QU Qimin HU yunfeng HUANG Liping dou Guangxi Institute of Traditional Chinese Medicine Nanning 530022 China Guangxi Key Laboratory of Traditional Chinese Medicine Quality Standards Nanning 530022 China First Affiliated Hospital of Guangxi University of Chinese Medicine Nanning 530022 China

[Objectives]The purpose was to provide scientific basis for the identification and application of Kadsura coccinea and its chief adulterant Kadsura heteroclite.[Methods]The botanical characteristics,traits and microscopic morphology of the two plants were compared.[Results]*** was clearly distinguished from *** in botanical characteristics,traits and microscopic morphology.[Conclusions]This study is of great significance to the identification and development of ***.

关键词： Kadsura coccinea Kadsura heteroclite Botanical characteristic Trait identification Microscopic identification

单孔振荡式微水试验确定裂隙岩体各向异性渗透参数

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

岩石力学与工程学报 2015年第2期34卷 271-278页

作者：周志芳庄超戴云峰窦智河海大学地球科学与工程学院江苏南京210098

基于振荡式微水试验的原理和岩体渗透系数张量的基本表达式,提出单孔分段振荡式微水试验。研发一套由多功能探头、密封阀、操作屏和气压泵等组成的测试设备,在技术上实现了单孔内围岩成像、量测裂隙产状、探测水压和水温变化,并将信息... 详细信息

基于振荡式微水试验的原理和岩体渗透系数张量的基本表达式,提出单孔分段振荡式微水试验。研发一套由多功能探头、密封阀、操作屏和气压泵等组成的测试设备,在技术上实现了单孔内围岩成像、量测裂隙产状、探测水压和水温变化,并将信息实时传输到上位机数据采集系统。通过采集的试验数据信息和围岩裂隙信息编制参数计算软件,实现了单孔试验确定裂隙渗透系数、岩体渗透系数张量和裂隙贮水率的技术和方法。以实例形式介绍了单孔微水振荡试验现场确定裂隙导水系数、岩体渗透系数张量的具体步骤和方法。

关键词：岩石力学微水试验渗透系数张量裂隙介质单孔

在线全文

学校读者我要写书评

暂无评论

减少风力机转矩波动的异步变桨控制

电工技术学报 2014年第1期29卷 236-245页

作者：窦真兰施刚曹云峰凌志斌蔡旭国家电网上海市电力公司电力科学研究院上海200437 上海交通大学电力传输与功率变换控制教育部重点实验室风力发电研究中心上海200240 上海交通大学船舶海洋与建筑工程学院海洋工程国家重点实验室上海200240

为了减少大型风力机的风轮转矩波动,本文根据风剪切、塔影和湍流对风轮转矩的影响规律提出了一种新型的异步变桨控制策略,即独立地对每个桨叶的桨距角进行控制,从而改变了桨叶上气动力产生的摆振力矩,减少了风轮转矩的波动和桨叶上的不... 详细信息

为了减少大型风力机的风轮转矩波动,本文根据风剪切、塔影和湍流对风轮转矩的影响规律提出了一种新型的异步变桨控制策略,即独立地对每个桨叶的桨距角进行控制,从而改变了桨叶上气动力产生的摆振力矩,减少了风轮转矩的波动和桨叶上的不平衡载荷;同时采用单神经元自适应PID控制策略设计异步变桨控制器。仿真结果不仅验证了基于单神经元自适应PID的异步变桨控制策略的正确性和有效性,而且证明采用该异步变桨控制系统不但减少了风轮转矩被动,还减少了桨叶上挥舞力矩的波动、偏航力矩波动和俯仰力矩波动,有效降低了风力发电机组各部件的疲劳载荷,对今后实际风场中异步变桨控制系统的实现具有一定的指导意义。

关键词：风轮转矩波动气动力摆振力矩异步变桨控制单神经元自适应PID

Reflectin基因起源及其蛋白质逐级组装的性质

在线全文

学校读者我要写书评

暂无评论

科学新闻 2018年第4期 119-119页

作者： Zhe Guan Tiantian Cai Zhongmin Liu yunfeng dou Xuesong Hu Peng Zhang Xin Sun Hongwei Li Yao Kuang Qiran Zhai Hao Ruan Xuanxuan Li Zeyang Li Qihui Zhu Jingeng Mai Qining Wang Luhua Lai Jianguo Ji Haiguang Liu Bin Xia Taijiao Jiang Shu-Jin Luo Hong-Wei Wang 谢灿北京大学生命科学学院

文章简介在自然界中,头足纲动物以动态变色和拟态隐形而著称。这其中涉及两种类型的颜色,分别是色素色彩和结构色彩。Reflectin是一类只存在于头足纲动物体内的特殊蛋白质家族,其构成了它们结构色变化的物质基础,然而其基因来源以及如... 详细信息

文章简介在自然界中,头足纲动物以动态变色和拟态隐形而著称。这其中涉及两种类型的颜色,分别是色素色彩和结构色彩。Reflectin是一类只存在于头足纲动物体内的特殊蛋白质家族,其构成了它们结构色变化的物质基础,然而其基因来源以及如何介导结构色彩变化的分子机理尚不清楚。本研究将reflectin基因起源追溯到一种与头足纲动

关键词：蛋白质结构色 Reflectin 分子机理