检索结果-南通市图书馆

Study on the two and three-parameter working stability regions of 3.-TZP suspension

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2006年第5期49卷 547-568页

作者： CHEN Youqiang1, 2, ZHANG Xinni3. CHEN Sha’ou3.& QI Ping3.1. Department of Chemistry, Qingdao University, Qingdao 266071, China 2. Department of Chemistry, Tsinghua University, Beijing 100084, China 3. Department of Physics, Qingdao University, Qingdao 266071, China 1. Department of Chemistry Qingdao University Qingdao 266071 China 2. Department of Chemistry Tsinghua University Beijing 100084 China 3. Department of Physics Qingdao University Qingdao 266071 China

We determined the variation tendency of viscosity (η) at various solids load- ing (α) for 3.-TZP suspension as a function of dispersant concentration (Cw) using vis- cosity measurement, measured the diameter of particles as a function of Cw in very dilute suspension using light scattering method, and obtained the surface features of the sedi- ment of suspension with different Cw using SEM. We also discussed the influence of the microstructure of adsorbed polymer layers on particles and their interactions in the dis- persing medium on the stability of suspension. Then two different stable states and two different unstable states for 3.-TZP suspension were given. Accordingly, the (Cw, η), (Cw, α), and (α, η) two-parameter, and (Cw, α, η) three-parameter stability maps were con- structed. Based on the DLVO theory calculations, the dispersant concentration, particle distance (r), and interparticle potential energy (VT) maps with various solids loading for 3.-TZP aqueous suspension were also constructed. In (Cw, r) two-parameter coordinate system, the stable motion region map for particles was established. The Cw, α, and VT,max (the highest potential energy) surface of the potential barrier map was obtained through calculation and simulation on the basis of the surfaces of Cw, r, VT maps introduced above. The (Cw, α) two-parameter stability map was then obtained from the Cw, α, VT,max map. The results showed that this theoretical map can qualitatively prove the experimentally obtained results—the existence of different dispersed states of particles in suspension system and the variation tendency of suspension stability with changing each parame- ter—were reasonable.

关键词： 3.-TZP, suspension, stability, DLVO theory, interparticle potential energy.

Sm-Nd and zircon SHRIMP U-Pb dating of Huilanshan mafic granulite in the Dabie Mountains and its zircon trace element geochemistry

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2005年第12期48卷 2081-2091页

作者： HOU Zhenhui1, LI Shuguang1, CHEN Nengsong2, LI Qiuli1 & LIU Xiaoming3.1. School of Earth and Space Sciences, University of Science and Technology of China, hefei 23.026, China 2. The Key Laboratory of Continental Dynamics of the Ministry of Education, Northwest University, Xi’an 710069, China 3. Faculty of Earth Sciences, China University of Geosciences, Wuhan 43.074, China 1. School of Earth and Space Sciences University of Science and Technology of China 230026 Hefei China 2. The Key Laboratory of Continental Dynamics of the Ministry of Education Northwest University 710069 Xi’an China 3. Faculty of Earth Sciences China University of Geosciences 430074 Wuhan China

The mafic granulites from Huilanshan are outcropped on the center of the Luotian dome in the northern Dabie Mountains. The Sm-Nd isochron defined by granulite-facies meta-morphic minerals (garnet + clinopyroxene + hypersthene) yields an age of 13. ± 18 Ma indicating the early Cretaceous granulite-facies metamorphism. The cathodoluminescence (CL) images of zircons from the granulite show clearly core-mantle-rim structures. The zircon cores are charac-terized by typical oscillatory zoning and highly HREE enriched patterns, which suggests their magma origin. Some zircon cores among them with little Pb loss give SHRIMP U-Pb ages rang-ing from 753.to 780 Ma, which suggests that the protolith of Huilanshan granulite is Neopro-terozoic mafic rocks. The zircon mantles usually cut across the oscillatory zone of the zircon cores have 3.10 times lower REE, Th, U, Y, Nb and Ta contents than the igneous zircon cores but have high common Pb contents. These characteristics suggest that they were formed by hydrothermal alteration of the igneous zircons. The part of zircon mantles with little Pb loss give a similar SHRIMP U-Pb age (716―780 Ma) to the igneous zircon cores, which implies that the hydrothermal events occurred closely to the magmatic emplacement. In view of the strong early Cretaceous magmatism in the Luotian dome, consequently, the Huilanshan mafic granulite was formed by heating of the Neoproterozoic mafic rocks in mid-low crust, which caused the granu-lite-facies metamorphism underneath the Dabie Mountains. The similarity between the granulite metamorphic age (13. ± 18 Ma) defined by Sm-Nd isochron and K-Ar age of 123.127 Ma given by amphible from the gneiss in Luotian dome suggests a rapid uplifting of the Luotian dome, which may result in further exhumation of the ultrahigh pressure metamorphic rocks in the Dabie Mountains.

关键词： Dabie orogen, granulite, zircon U-Pb ages, Sm-Nd age.

基于XCM模型预测排球运动员前交叉韧带应力

在线全文

学校读者我要写书评

暂无评论

医用生物力学 2024年

作者：张楠孟庆华鲍春雨 1.天津体育学院社会体育学院 2.天津市运动损伤与康复虚拟仿真实验教学中心 3.天津体育学院体育经济与管理学院 4.天津体育学院运动健康学院天津体育学院社会体育学院天津市运动损伤与康复虚拟仿真实验教学中心天津体育学院体育经济与管理学院天津体育学院运动健康学院

目的通过XCM深度神经网络模型预测排球运动员扣球落地左腿前交叉韧带（anteriorcruciateligament，ACL）应力情况。方法基于核磁共振和CT影像建立完整的膝关节有限元模型；通过8镜头Qualisys动捕系统和Kistler三维测力台同步采集排球... 详细信息

目的通过XCM深度神经网络模型预测排球运动员扣球落地左腿前交叉韧带（anteriorcruciateligament，ACL）应力情况。方法基于核磁共振和CT影像建立完整的膝关节有限元模型；通过8镜头Qualisys动捕系统和Kistler三维测力台同步采集排球运动员运动学和动力学数据；通过OpenSim中肌骨模型计算膝关节力矩，将关节力矩作为有限元模型输入，输出ACL应力；将运动学、动力学数据作为神经网络的输入，ACL应力作为输出。结果排球运动员扣球落地ACL等效应力峰值为（27.7±0.3.）MPa，最大主应力为（8.2±0.23.MPa，最大剪切应力为（14.7±0.3.）MPa；等效应变（5.7±0.008）%，最大主应变（5.0±0.006）%、最大剪切应变为（7.6±0.009）%。预测值与计算值间归一化的均方根误差为5.84%～7.12%，均方根误差为0.251～0.282。结论XCM模型可在一定范围内预测排球运动员扣球过程中ACL应力情况。研究结果为获得排球运动员生物力学数据提供新途径，以及帮助排球运动员预防ACL损伤提供有效方法。

关键词：深度神经网络有限元模型前交叉韧带排球扣球落地

山西省财政厅等4部门关于印发非常规天然气增储上产专项资金管理办法的通知(晋财规建〔2024〕2号)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

山西省人民政府公报 2024年第5期 45-47页

作者： 1.山西省财政厅 2.山西省发展和改革委员会 3.山西省自然资源厅 4.山西省能源局山西省财政厅山西省发展和改革委员会山西省自然资源厅山西省能源局

各市财政局、发展改革委、规划和自然资源局、能源局:为全面落实省委、省政府关于推进能源革命综合改革试点部署要求,加快非常规天然气基地建设,发挥财政资金对产业高质量发展的引导作用,省财政厅、省发展改革委、省自然资源厅、省能源... 详细信息

各市财政局、发展改革委、规划和自然资源局、能源局:为全面落实省委、省政府关于推进能源革命综合改革试点部署要求,加快非常规天然气基地建设,发挥财政资金对产业高质量发展的引导作用,省财政厅、省发展改革委、省自然资源厅、省能源局共同制定了《非常规天然气增储上产专项资金管理办法》,现予印发,请遵照执行。

关键词：山西省财政厅专项资金管理非常规天然气财政资金能源革命增储上产引导作用自然资源

在线全文

学校读者我要写书评

暂无评论

普陀区服务企业发展工作实施意见

上海市普陀区人民政府公报

上海市普陀区人民政府公报 2024年第1期 59-65页

作者： 1.普陀区投资促进办公室 2.普陀区财政局 3.普陀区商务委员会 4.普陀区发展和改革委员会普陀区投资促进办公室普陀区财政局普陀区商务委员会普陀区发展和改革委员会

普投资规范〔2023.1号为贯彻落实《上海市鼓励跨国公司设立地区总部的规定》（沪府规〔2022〕17号）、《上海市优质中小企业梯度培育管理实施细则》（沪经信规范〔2022〕8号）、《上海市提信心扩需求稳增长促发展行动方案》（沪府规〔2...

普投资规范〔2023.1号为贯彻落实《上海市鼓励跨国公司设立地区总部的规定》（沪府规〔2022〕17号）、《上海市优质中小企业梯度培育管理实施细则》（沪经信规范〔2022〕8号）、《上海市提信心扩需求稳增长促发展行动方案》（沪府规〔2023.1号）等文件精神，加快引进和培育区域产业导向企业，推动产业转型和能级提升，结合本区实际，经研究，制定本意见。

关键词：

BIVARIATE RATIONAL IN TERPOLANTS WITHRECTANGLE-HOLE-STRUCTURE

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 1999年第1期17卷 1-14页

作者： Jie-qing Tan(Institute of Applied Mathematics, hefei University Of Technology, hefei 23.009, China) hefei Univ Technol Inst Appl Math Hefei 230009 Peoples R China

Bivariate vector valued rational interpolants are established by means of Thiele-type branched continued fractions and Samelson inverse over rectangular grids with holes, characterisation theorem with topologic struct... 详细信息

关键词： branched continued fraction interpolation vector-grid

A study of two-dimensional magnetic polaron

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2006年第4期49卷 421-429页

作者： LIU Tao1, ZHANG Huaihong1, FENG Mang1,2 & WANG Kelin1,3.1. School of Science, Southwest University of Science and Technology, Mianyang 621010, China 2. Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 43.070, China 3. Department of Modern Physics, University of Science and Technology of China, {3. 23.026, China School of Science Southwest University of Science Technology Mianyang 621010 China Wuhan Institute of Physics Mathematics Chinese Academy of Sciences Wuhan 430070 China Department of Modern Physics University of Science Technology of China Hefei 230026 China

By using the variational method and anneal simulation, we study in this paper the self-trapped magnetic polaron (STMP) in two-dimensional anti-ferromagnetic material and the bound magnetic polaron (BMP) in ferromagnetic material. Schwinger angular momentum theory is applied to changing the problem into a coupling problem of carriers and two types of Bosons. Our calculation shows that there are single-peak and multi-peak structures in the two-dimensional STMP. For the ferromagnetic material, the properties of the two-dimensional BMP are almost the same as that in one-dimensional case; but for the anti-ferromagnetic material, the two-dimensional STMP structure is much richer than the one-dimensional case.

关键词： self-trapped magnetic polaron, bound magnetic polaron, impurity potential, anti-ferromagnet.

在线全文

学校读者我要写书评

暂无评论

螺旋锚-岩石锚复合基础承载变形性能研究

建筑科学与工程学报 2024年

作者：马锦元李镜培刘祥国崔强赵勇高运兴 1.同济大学地下建筑与工程系 2.国网山东省电力公司泰安供电公司 3.中国电力科学研究院有限公司 4.国网山东省电力公司国网山东省电力公司中国电力科学研究院有限公司同济大学地下建筑与工程系国网山东省电力公司泰安供电公司

对山区输电线路工程中“上土下岩”的特殊地质条件，采用了一种新型螺旋锚-岩石锚复合基础形式。利用ABAQUS有限元软件建立了典型工况下的抗拔承载数值模型，并采用规范方法对单螺旋锚和单岩石锚的数值计算结果进行了验证，继而利用荷载... 详细信息

对山区输电线路工程中“上土下岩”的特殊地质条件，采用了一种新型螺旋锚-岩石锚复合基础形式。利用ABAQUS有限元软件建立了典型工况下的抗拔承载数值模型，并采用规范方法对单螺旋锚和单岩石锚的数值计算结果进行了验证，继而利用荷载-位移曲线探究了双锚复合基础抗拔承载力计算公式中的各项参数取值，在此基础上分析了双锚复合基础的抗拔承载机理和破坏模式。最后建立了不同工况下的数值模型，研究了锚盘数量、锚盘直径、岩石锚杆长度和锚固剂黏结强度对双锚复合基础抗拔承载力的影响。数值模拟结果表明，双锚复合基础相比单独岩石锚杆基础和单独螺旋锚基础的极限抗拔承载力有一定程度的提升；双锚复合基础的抗拔过程主要分为四个阶段：加荷初期由下部注浆体承担大部分荷载；基础塑性区持续扩大；土岩分界面处的注浆体塑性区贯通；基础达到极限承载状态，基础失效。增加锚盘数量和一定范围内增加下部基础的长度会对双锚复合基础的极限抗拔承载力有较大提升；增加锚盘直径和提高注浆体与岩体之间的黏结强度对双锚复合基础的极限抗拔承载力的提升作用不明显；复合基础在弹性模量较大的土体中承载力发挥更充分。

关键词：输电线路基础岩石锚杆螺旋锚抗拔承载力数值分析

基于多分辨率点云表型重建的田间植株叶面积指数估算

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

热带地理 2024年

作者：龙洋洋周忠发赵馨张田彭睿文伍贵洁郑佳佳陈淋淋 1.贵州师范大学喀斯特研究院/地理与环境科学学院 2.贵州喀斯特山地生态环境国家重点实验室培育基地 3.国家喀斯特石漠化防治工程技术研究中心贵州师范大学喀斯特研究院/地理与环境科学学院贵州喀斯特山地生态环境国家重点实验室培育基地国家喀斯特石漠化防治工程技术研究中心

为解决传统田间植株叶面积参数测量精度低、破坏性大和劳动强度大等问题，本文选取烟草作为研究对象，利用无人机摄影测量进行特征点匹配生成密集点云构建烟草点云表型模型，并利用Lambert球面坐标系将三维坐标转换为球面坐标，分别计... 详细信息

为解决传统田间植株叶面积参数测量精度低、破坏性大和劳动强度大等问题，本文选取烟草作为研究对象，利用无人机摄影测量进行特征点匹配生成密集点云构建烟草点云表型模型，并利用Lambert球面坐标系将三维坐标转换为球面坐标，分别计算孔隙度、有效叶面积指数和丛生指数进而得到真实叶面积指数，以半球摄影法计算的结果作为参考值分析不同空间分辨率下单株和地块尺度叶面积指数的计算精度。结果表明：无人机摄影测量中0.43.0.86、1.29、2.15 cm 4种分辨率点云模型计算的结果和数字半球摄影法计算得到的结果的决定系数R2分别为0.959、0.93.、0.967和0.985，相对误差RE分别为11.87%、19.74%、14.96%和11.79%，均方根误差RMSE分别为0.150、0.195、0.13.和0.094，相对均方根误差r RMSE分别为20.81%、26.97%、18.87%和13.10%。4种分辨率模型的整体计算精度较高，其中单株烟草和地块尺度烟草最佳计算精度模型均为分辨率2.15 cm的点云模型，计算精度分别为87.29%、94.24%，研究结果表明通过无人机摄影测量获取三维点云能够对喀斯特山区石漠化较为严重地区的烟草LAI进行估算，同时证明无人机点云表型模型估算田间植株叶面积指数具有可行性、准确性和高效性的特点。

关键词：叶面积指数无人机点云孔隙度烟草