检索结果-南通市图书馆

乌鲁木齐市主城区生活服务业空间分布特征研究

在线全文

学校读者我要写书评

暂无评论

新疆师范大学学报（自然科学版） 2024年第4期43卷 26-35页

作者：张举坤董晔新疆师范大学地理科学与旅游学院新疆乌鲁木齐830054 新疆师范大学商学院新疆乌鲁木齐830017 丝绸之路经济带核心区产业高质量发展研究中心新疆乌鲁木齐830017

在服务经济中,生活服务业与居民日常生活相关性较高,其在空间上的合理布局对于优化资源配置,提升居民生活质量等方面具有重要意义。文章运用平均最近邻指数、核密度分析、空间相关性分析及标准差椭圆分析等方法,对乌鲁木齐市主城区2022... 详细信息

在服务经济中,生活服务业与居民日常生活相关性较高,其在空间上的合理布局对于优化资源配置,提升居民生活质量等方面具有重要意义。文章运用平均最近邻指数、核密度分析、空间相关性分析及标准差椭圆分析等方法,对乌鲁木齐市主城区2022年各类生活服务业的空间分布和空间关联性进行分析。结果表明:(1)各类生活服务业分布呈集聚特征且存在空间尺度效应,随着距离增加,集聚性特征呈先增后减趋势;(2)各类生活服务业分布的高值区域有明显重合特征;(3)各类生活服务业空间关联度较强;(4)各类生活服务业在空间分布上均呈西北—东南走向,且分布中心十分接近;(5)人口分布与生活服务业分布存在不配套现象。

关键词： POI 生活服务空间分布相关性乌鲁木齐

在线全文

学校读者我要写书评

暂无评论

基于相位靶和神经网络的单目相机标定

光学技术 2024年第3期50卷 346-353页

作者：张党成董秀成雎雅玲向贤明西华大学电气与电子信息学院四川成都610039 四川大学锦江学院四川眉山620860

针对传统基于BP神经网络的标定方法标定精度低,深度方向误差大等问题,提出了一种基于相位靶和径向基函数(RBF)神经网络的单目相机标定方法。采用三步相移法的特征提取方法,并使用多频法计算绝对相位,将相位靶特征点承载的绝对相位转换... 详细信息

针对传统基于BP神经网络的标定方法标定精度低,深度方向误差大等问题,提出了一种基于相位靶和径向基函数(RBF)神经网络的单目相机标定方法。采用三步相移法的特征提取方法,并使用多频法计算绝对相位,将相位靶特征点承载的绝对相位转换到三维空间,建立特征点图像坐标与世界坐标之间的对应关系,最后使用RBF神经网络完成二维图像坐标到三维空间坐标的直接映射。实验结果表明,对比传统使用BP神经网络进行标定与棋盘格,圆形标定靶的标定结果,该方法的平均标定误差为0.0980mm,同时在焦距1.4mm,视场220°鱼眼镜头下,仍能保持较高的精度,证明了所提方法的可行性和有效性。

关键词：相位靶 RBF神经网络绝对相位计算相机标定

Development of biomedical hydrogels for rheumatoid arthritis treatment

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Pharmaceutical Sciences 2024年第1期19卷 35-48页

作者： Mirza Muhammad Faran Ashraf Baig lee KiWong Abdul Wasy Zia Hongkai Wu Department of Chemistry Hong Kong University of Science and TechnologyHong Kong 999077China Institute of Mechanical Process and Energy Engineering(IMPEE)School of Engineering and Physical SciencesHeriot-Watt UniversityEdinburghUnited Kingdom

Rheumatoid Arthritis(RA)is an autoimmune disorder that hinders the normal functioning of bones and joints and reduces the quality of human *** year,millions of people are diagnosed with RA worldwide,particularly among elderly individuals and ***,there is a global need to develop new biomaterials,medicines and therapeutic methods for treating *** will improve the Healthcare Access and Quality Index and also relieve administrative and financial burdens on healthcare service providers at a global *** are soft and cross-linked polymeric materials that can store a chunk of fluids,drugs and biomolecules for hydration and therapeutic *** are biocompatible and exhibit excellent mechanical properties,such as providing elastic cushions to articulating joints by mimicking the natural synovial ***,hydrogels create a natural biological environment within the synovial cavity to reduce autoimmune reactions and *** also lubricate the articulating joint surfaces to prevent degradation of synovial surfaces of bones and cartilage,thus exhibiting high potential for treating *** work reviews the progress in injectable and implantable hydrogels,synthesis methods,types of drugs,advantages and ***,it discusses the role of hydrogels in targeted drug delivery,mechanistic behaviour and tribological performance for RA treatment.

关键词： Rheumatoid arthritis Orthopeadic joints Hydrogel Therapeutics Mechanical properties Medicine

On Strong Kadison–Singer Algebras

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2013年第12期29卷 2219-2232页

作者： Ai ju dong dong WANG School of Mathematics and Computer Engineering Xi’an University of Arts and Science Institute of Mathematics Academy of Mathematics and Systems Science Department of Mathematics and Statistics University of New Hampshire

We show that many Kadison-Singer algebras are maximal triangular in all algebras containing them although their definition requires the maximality taken in the class of reflexive algebras. Diagonal-trivial maximal non... 详细信息

关键词： Kadison-Singer algebra Kadison-Singer lattice reflexive algebra double triangle lattice von Neumann algebra

Community perspectives on the effectiveness of watershed management institutions in the Himalayas

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2024年第4期21卷 1119-1139页

作者： Nisha SILWAL Nabin DHUNGANA Rajan SUBEDI Suraj UPADHAYA Chun-Hung lee Natural Resources Conservation Nepal(NRCN) ChitwanP.O.Box 44200Nepal Department of Natural Resources and Environmental Studies College of Environmental StudiesNational Dong Hwa UniversityHualien 97401Chinese Taipei Institute of Forestry Tribhuvan UniversityPokharaP.O.Box 43Nepal School of Agriculture and Natural Resources Kentucky State UniversityFrankfortKY 40601USA Himalayan Conservation and Research Institute DolpaP.O.Box 21400Nepal

The sustainability of environmental management initiatives,such as watershed management programs,relies on the presence of effective institutions at the watershed ***,there needs to be more empirical evidence from evaluating the effectiveness of watershed-level ***,this study presents a pioneering effort to evaluate the effectiveness of Nepal’s first watershed conservation committee at the watershed scale,focusing on the case of the Khageri Khola watershed in Central *** study involved conducting a household survey,key informant interviews,focus group discussions,and field observations to collect and analyze the *** analysis,index value calculation,and chi-square statistics were then employed to summarize the results regarding local respondents’perceptions of twelve institutional characteristics,their rationalities,and their association with socio-demographic *** results reveal that the watershed conservation committee was perceived as performing well in managing the ***,good interaction,appropriate scale,technical,environmental,social,organizational,and government rationality were perceived as highly effective,with an average index value of less than *** contrast,clarity of objectives and economic rationality showed moderate effectiveness,with an average index value ranging from 0.36 to ***,the results suggested that adaptiveness,compliance capacity,and financial rationality merit increased attention,intending to improve their ***,the results showed the association of socio-demographics with respondents’perceptions of various indicators of institutional characteristics and their ***,the study provides valuable insights for policymakers,researchers,and development practitioners charged with designing sustainable and effective programs and *** enhance the effectiveness and sustainability of watershed management programs,we recommen

关键词： Watershed Watershed institutions Indicators Institutional characteristics Rationalities Nepal.

大宁—吉县地区5号煤层现今地应力预测及其对煤层气开发的影响

在线全文

学校读者我要写书评

暂无评论

科学技术与工程 2024年第13期24卷 5286-5295页

作者：于国栋鞠玮杨兆彪中国矿业大学煤层气资源与成藏过程教育部重点实验室徐州221008 中国矿业大学资源与地球科学学院徐州221116

现今地应力场对煤储层渗透率具有极其重要的控制作用。中国鄂东大宁—吉县地区煤层气资源丰富,然而该区现今地应力研究程度较低,限制着该区煤层气的高效开发。为查明大宁—吉县地区主采煤层现今地应力场特征,利用三维有限元数值模拟方... 详细信息

现今地应力场对煤储层渗透率具有极其重要的控制作用。中国鄂东大宁—吉县地区煤层气资源丰富,然而该区现今地应力研究程度较低,限制着该区煤层气的高效开发。为查明大宁—吉县地区主采煤层现今地应力场特征,利用三维有限元数值模拟方法对下二叠统山西组5号煤层现今地应力分布进行预测。结果表明,5号煤层现今地应力表现为正断型应力机制。鄂东大宁—吉县5号煤层最大水平主应力在15.4~21.6 MPa,最小水平主应力在9.8~14.4 MPa,构造变形的复杂性影响地应力分布。现今地应力控制压裂裂缝扩展,研究区现今地应力状态下的压裂缝沿NNW-SSE向垂直扩展。研究区5号煤层应力差大部分小于6 MPa,具备形成复杂裂缝网络的地应力基础。煤层渗透率随有效地应力的增大呈指数减小,有效地应力越大,煤储层的渗透性越差。研究区东南部远离断层,地应力值相对较低,有利于形成煤层气富集区。研究成果可为大宁—吉县地区煤层气效益开发提供地质基础与科学指导。

关键词：现今地应力大宁—吉县地区 5号煤层数值模拟渗透率

Novel acoustic features for speech emotion recognition

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2009年第7期52卷 1838-1848页

作者： ROH Yong-Wan KIM dong-ju lee Woo-Seok HONG Kwang-Seok School of Information and Communication Engineering Sungkyunkwan University300Chunchun-dongJangan-guSuwonKyungki-do440-746Korea Development Division / DSP Development Team Tamul Multimedia10th Fl.Anyang Trade Center1107Bisan-DongDongAn-GuAnyang-City431-050Korea

This paper focuses on acoustic features that effectively improve the recognition of emotion in human *** novel features in this paper are based on spectral-based entropy parameters such as fast Fourier transform(FFT) spectral entropy,delta FFT spectral entropy,Mel-frequency filter bank(MFB) spectral entropy,and Delta MFB spectral ***-based entropy features are *** reflect frequency characteristic and changing characteristic in frequency of *** implement an emotion rejection module using the probability distribution of recognized-scores and *** reduces the false recognition rate to improve overall ***-scores and rejected-scores refer to probabilities of recognized and rejected emotion recognition results,*** scores are first obtained from a pattern recognition *** pattern recognition phase uses the Gaussian mixture model(GMM).We classify the four emotional states as anger,sadness,happiness and *** proposed method is evaluated using 45 sentences in each emotion for 30 subjects,15 males and 15 *** results show that the proposed method is superior to the existing emotion recognition methods based on GMM using energy,Zero Crossing Rate(ZCR),linear prediction coefficient(LPC),and pitch *** demonstrate the effectiveness of the proposed *** of the proposed features,combined MFB and delta MFB spectral entropy improves performance approximately 10% compared to the existing feature parameters for speech emotion recognition *** demonstrate a 4% performance improvement in the applied emotion rejection with low confidence score.

关键词： speech emotion recognition MFB spectral entropy entropy emotion recognition rejection

Microstructure evolution and thermal physical properties of CuCr alloy after high pressure treatment

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2014年第3期33卷 293-298页

作者： Yu-Quan Ma Hong-ju Lin dong-dong SongMechanical and Electrical Engineering College Hebei Normal University of Science and Technology

The thermal diffusion coefficient, thermal conductivity, and thermal expansion coefficient of CuCr alloy prepared by infiltration were measured by thermal constant tester and dilatometer before and after high pressure heat treatment, at the same time, the effect of high pressure treatment on the thermal physical properties of CuCr alloy was discussed by the analysis of its microstructure. The experimental results show that high pressure heat treatment can increase the thermal diffusion coefficient and thermal conductivity of CuCr alloy, but it changes slightly in the pressure range of 1-6 GPa. As for thermal expansion coefficient, when the temperature is higher than 130 °C, it is obviously higher than that of the alloy without high pressure treatment after 1 GPa pressure treatment, and the higher the temperature is, the larger their differences are.

关键词： CuCr alloy High pressure treatment Thermaldiffusion coefficient Thermal conductivity Thermalexpansion coefficient

低温作用下钢纤维地聚合物混凝土力学性能研究

在线全文

学校读者我要写书评

暂无评论

硅酸盐通报 2024年第9期43卷 3203-3213,3223页

作者：王萧萧董培森杨鑫瑞张菊闫长旺董宇飞内蒙古工业大学土木工程学院呼和浩特010051 内蒙古工业大学内蒙古自治区土木工程结构与力学重点实验室呼和浩特010051 生态型建筑材料与装配式结构内蒙古自治区工程研究中心呼和浩特010051 内蒙古工业大学矿产资源绿色开发重点实验室呼和浩特010051

为研究低温作用下钢纤维地聚合物混凝土(SFGPC)力学性能的变化规律,利用自制低温环境试验装置研究不同温度(-30、-20、-10、0、20℃)、不同钢纤维体积掺量(0%、0.5%、1.0%、1.5%)对地聚合物混凝土破坏特征及抗压、抗折强度的响应规律,... 详细信息

为研究低温作用下钢纤维地聚合物混凝土(SFGPC)力学性能的变化规律,利用自制低温环境试验装置研究不同温度(-30、-20、-10、0、20℃)、不同钢纤维体积掺量(0%、0.5%、1.0%、1.5%)对地聚合物混凝土破坏特征及抗压、抗折强度的响应规律,并借助扫描电子显微镜(SEM)对SFGPC进行微观结构分析,同时应用响应面法(RSM)构建SFGPC力学性能关系模型,提供一种可行的抗压、抗折强度预测方法。结果表明:-30℃下,当钢纤维掺量为1.5%时,SFGPC抗压、抗折强度分别为59.8、6.6 MPa,与-30℃下钢纤维掺量为0%时相比分别提升75%、65%,与20℃下钢纤维掺量为1.5%时相比分别提升41%、144%;随着钢纤维掺量增加,SFGPC内部黏结性与吸附能力增强,力学性能提高;利用RSM得到SFGPC抗压、抗折强度的预测模型,预测值与试验值的相对误差分别小于5.7%、8.0%。

关键词：钢纤维地聚合物混凝土低温环境力学性能微观形貌