检索结果-南通市图书馆

13-18岁青少年颈椎关节突关节发育特征的数字化三维形态分析

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

中国组织工程研究 2025年第21期29卷 4486-4491页

作者：李贵花和雨洁史君李琨张少杰刘路李志军王星内蒙古自治区监狱管理局第一医院内蒙古自治区呼和浩特市010000 内蒙古医科大学基础医学院解剖学教研室内蒙古自治区呼和浩特市010110 内蒙古医科大学基础医学院生理学教研室内蒙古自治区呼和浩特市010110 内蒙古医科大学基础医学院数字医学中心内蒙古自治区呼和浩特市010110

背景:颈椎关节突关节作为颈椎后柱的重要解剖结构,在颈部活动、应力传导以及维持颈椎稳定性中发挥重要的作用。近年来通过解剖学和生物力学研究表明,颈椎关节突关节不对称可引起关节突关节的退变,颈椎关节突关节的退变可能是引起青年人... 详细信息

背景:颈椎关节突关节作为颈椎后柱的重要解剖结构,在颈部活动、应力传导以及维持颈椎稳定性中发挥重要的作用。近年来通过解剖学和生物力学研究表明,颈椎关节突关节不对称可引起关节突关节的退变,颈椎关节突关节的退变可能是引起青年人颈椎退变的主要原因。现有研究多集中在成人,国内对于学龄前儿童、学龄期儿童也有报道,而对于青少年颈椎小关节形态相关参数鲜有报道。目的:通过三维重建青少年颈椎关节突关节,测量其相关形态参数,并与儿童和成年人进行比较分析,探讨颈椎小关节形态发育的增龄变化规律,为临床颈椎小关节源性颈椎病的诊治和预防提供理论依据。方法:选择13-18岁青少年62例,行颈椎螺旋CT扫描后三维重建,要求无骨质破坏、肿瘤、畸形、骨折等,椎骨形态结构未发生改变,既往无脊柱相关手术,监护人对试验方案知情同意。按年龄分组,A组年龄为13-14岁,B组年龄为15-16岁,C组年龄为17-18岁。对各组青少年进行C_2-C_7关节突关节相关形态测量及统计分析。结果与结论:(1)3组关节突关节面高和关节面宽在随椎序的变化中,分别呈递减和递增趋势,下关节突关节面的高和宽均大于上关节面的相应指标;(2)关节突关节内高在3组年龄中,最小值均位于C5,且与年龄呈正相关变化;(3)关节突关节面间隙在3组中,A组C_(4-5)、B组C_(3-4)和C组C_(4-5)明显大于各组其余间隙;A、B组除C_(4-5)外,其余无显著性差异;C组除C_(2-3)其余椎序间关节面间隙均明显大于A、B组;(4)提示颈椎关节突关节面的形态随椎序的增加,逐渐由圆形过渡到椭圆形;在组间比较中,关节面高较关节面宽受年龄影响明显;各节段下关节面的面积均大于上关节面的面积,仅在C_(4-5)和C_(5-6)形态和面积有显著性差异;加之关节突关节内高最小值均位于C5,关节突关节面间隙明显增宽处也主要位于C_(3-4)和C(_4-5),因此颈椎失稳多发生于中位节段。

关键词：青少年颈椎关节突关节数字化形态三维重建

青少年颈椎间盘突出症有限元模型建立及应力分析

在线全文

学校读者我要写书评

暂无评论

中国组织工程研究 2025年第3期29卷 448-454页

作者：赵宇昕亮亮金凤许阳阳康志杰方源和雨洁王星王海燕李筱贺内蒙古医科大学基础医学院人体解剖教研室内蒙古自治区呼和浩特市010010 内蒙古医科大学第一临床医学院内蒙古自治区呼和浩特市010010 内蒙古医科大学附属医院影像科内蒙古自治区呼和浩特市010010 长治市人民医院康复医学科山西省长治市046000

背景:颈椎间盘突出症可引起肩颈部疼痛、上肢放射性疼痛,发病率逐年上升并趋于年轻化,充分了解青少年颈椎生物力学特点,对于延缓青少年颈椎间盘突出症具有重要意义。目的:利用有限元分析技术重建正常青少年及青少年颈椎间盘突出症患者... 详细信息

背景:颈椎间盘突出症可引起肩颈部疼痛、上肢放射性疼痛,发病率逐年上升并趋于年轻化,充分了解青少年颈椎生物力学特点,对于延缓青少年颈椎间盘突出症具有重要意义。目的:利用有限元分析技术重建正常青少年及青少年颈椎间盘突出症患者的颈椎模型,分析C_(1)-T_(1)颈椎椎体活动度和纤维环、髓核、终板及小关节软骨的生物力学特征。方法:选择正常青少年和青少年颈椎间盘突出症患者各1例,将连续扫描的颈椎CT原始影像数据以DICOM格式导入Mimics 21.0,分别重建C_(1)-T_(1);随后将建立好的模型导入3-Matic软件进行椎间盘重建,将完善的模型导入Hypermesh软件,对椎体、髓核、纤维环、韧带进行网格划分,生成有效的几何模型,赋予材料属性后将最终模型导入ABAQUS软件中。观察C_(1)-C_(7)各节段颈椎椎体在不同工况下的关节活动度,并分析各节段颈椎纤维环、髓核、终板及小关节软骨的生物力学特征。结果与结论:(1)正常青少年与颈椎间盘突出症青少年患者颈椎模型C1在6种工况下的关节活动度均高于其他椎体,且正常青少年各节段颈椎椎体活动度均大于颈椎间盘突出症青少年患者;(2)正常青少年颈椎模型纤维环及髓核应力最大值在C_(2-3)左侧屈工况(0.43 MPa,0.17 MPa),颈椎间盘突出症青少年患者颈椎模型应力最大值在C_(7)-T_(1)左侧屈工况(0.54 MPa,0.18 MPa);(3)正常青少年颈椎模型终板应力最大值在C_(3)上终板左侧屈工况(1.46 MPa),颈椎间盘突出症青少年患者模型终板应力最大值在C7下终板左侧屈工况(1.32 MPa);(4)正常青少年颈椎小关节软骨应力最大值在C_(2-3)左旋转工况(0.98 MPa),颈椎间盘突出青少年患者的小关节软骨在不同工况下以C_(1-2)应力增加最明显,应力最大在左侧屈(3.50 MPa);(5)提示与正常青少年相比,颈椎间盘突出症青少年患者颈椎曲度改变,颈椎整体关节活动度下降;颈椎间盘突出症青少年患者纤维环、髓核及终板在C_(7)-T_(1)节段应力明显增大;C_(1-2)左侧小关节软骨应力明显,颈椎曲度异常可能是引起应力改变的主要因素。

关键词：青少年颈椎间盘突出症颈椎应力有限元分析生物力学

Microbial electrochemistry for bioremediation

在线全文

学校读者我要写书评

暂无评论

Environmental Science and Ecotechnology 2020年第1期1卷 85-91页

作者： Xiaofei Wang Federico Aulenta Sebastia Puig Abraham Esteve-Nunez yujie he Yang Mu Korneel Rabaey Center for Microbial Ecology and Technology(CMET) Ghent UniversityCoupure Links 6539000GhentBelgium Centre for Advanced Process Technology for Urban Resource Recovery(CAPTURE) Ghent UniversityBelgium Water Research Institute(IRSA) National Research Council(CNR)Via Salaria Km 2930000015MonterotondoRMItaly LEQUiA.Institute of the Environment University of GironaCampus Montilivi.C/Maria Aurelia Capmany69E-17003GironaCataloniaSpain Department of Analytical Chemistry and Chemical Engineering University of AlcalaCampus UniversitarioCtra.Madrid-Barcelona Km 33.60028871Alcala de HenaresSpain State Key Laboratory of Pollution Control and Resource Reuse(SKL-PCRR) School of the EnvironmentNanjing UniversityXianlin Avenue 163Nanjing210023China Department of Applied Chemistry School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefeiAnhui230026China

Lack of suitable electron donors or acceptors is in many cases the key reason for pollutants to persist in the *** supplementation of electron donors or acceptors is often difficult to control and/or involves chemical additions with limited lifespan,residue formation or other adverse side *** electrochemistry has evolved very fast in the past years–this field relates to the study of electrochemical interactions between microorganisms and solid-state electron donors or *** can be supplied in such so-called bioelectrochemical systems(BESs)at low voltage to provide or extract electrons in a very precise manner.A plethora of metabolisms can be linked to electrical current now,from metals reductions to denitrification and *** this perspective,we provide an overview of the emerging applications of BES and derived technologies towards the bioremediation field and outline how this approach can be game changing.

关键词： electrochemistry precise residue

Timely monitoring of soil water-salt dynamics within cropland by hybrid spectral unmixing and machine learning models

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Soil and Water Conservation Research 2024年第3期12卷 726-740页

作者： Ruiqi Du Junying Chen Youzhen Xiang Ru Xiang Xizhen Yang Tianyang Wang yujie he Yuxiao Wu Haoyuan Yin Zhitao Zhang Yinwen Chen College of Water Resources and Architectural Engineering Northwest A&F UniversityYanglingShanxi712100China College of Language and Culture Northwest A&F UniversityYanglingShanxi712100China

Soil salinization and water scarcity are main restrictive factors for irrigated agriculture development in arid *** dynamics of soil water and salt content is an important antecedent in remediating salinized soils and optimizing irrigation *** studies mostly used remote sensing technologies to individually monitor water or salt content dynamics in agricultural *** ability to asses different levels of crop water and salt management has been less ***,how to extract effective diagnostic features from remote sensing images derived spectral information is crucial for accurately estimating soil water and salt *** this study,Linear spectral unmixing method(LSU)was used to obtain the contribution of soil water and salt to each band spectrum(abundance),and endmember spectra from Sentinel-2 *** spectral indices and selecting optimal spectal combination were individually based on soil water and salt endmember *** estimation models were constructed using six machine learning algorithms:BP Neural Network(BPNN),Support Vector Regression(SVR),Partial Least Squares Regression(PLSR),Random Forest Regression(RFR),Gradient Boost Regression Tree(GBRT),and eXtreme Gradient Boosting tree(XGBoost).The results showed that the spectral indices calculated from endmember spectra were able to effectively characterize the response of crop spectral properties to soil water and salt,which circumvent spectral ambiguity induced by water-salt *** spectral index was a reliable indicator for estimating water and salt content,with determination coefficients(R2)being 0.55 and 0.57,*** to other models,LSU-XGBoost model achieved the best *** model properly reflected the process of soil water-salt dynamics in farmland during crop growth *** study provided new methods and ideas for soil water-salt estimation in dry irrigated agricultural areas,and provided decision support for gove

关键词： XGBoost Sentinel-2 Spectral unmixing Soil water Soil salt Irrigation area

Development Situations and Countermeasures of Gastrodia elata Industry in Zhaotong City

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Agricultural Research 2020年第9期12卷 28-29,32页

作者： Xuewei ZHU Qifa LI yujie he College of City Construction Jiangxi Normal UniversityNanchang 330022China

With the rapid development of technology,people's living standards have been greatly improved,and more and more people have started to care more about the theory and health preservation function of *** elata,as a precious Chinese herbal medicine,is harmless to human *** to the high economic benefits and real benefits for farmers,the *** industry has developed *** is the hometown of *** *** in China,but the current situation of the *** industry lags behind other producing *** field survey and literature review,this paper comprehensively analyzed the development status of the *** industry in Zhaotong *** with the natural conditions,policy conditions,and socio-economic conditions of the *** industry in Zhaotong City to find countermeasures and recommendations to promote the further development of the *** industry in Zhaotong and provide recommendations for the sustainable development of *** industry.

关键词： Gastrodia elata in Zhaotong Current situations of Gastrodia elata industry Two varieties of bacteria planting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

再论黄省曾《西洋朝贡典录》

史学理论研究 2018年第2期 96-104,159页

作者：贺玉洁西北大学文学院邮编:710127

明黄省曾的《西洋朝贡典录》是一部重要的史地学著作,黄氏以征实的精神、简明的体例、典丽的文辞详细记述了郑和下西洋时所历二十三国各方面情况。目前学术界对该著的成书时间、版本流传、史料价值均有涉及,然既有研究成果,在成书时间... 详细信息

明黄省曾的《西洋朝贡典录》是一部重要的史地学著作,黄氏以征实的精神、简明的体例、典丽的文辞详细记述了郑和下西洋时所历二十三国各方面情况。目前学术界对该著的成书时间、版本流传、史料价值均有涉及,然既有研究成果,在成书时间、版本流传方面颇多值得商榷之处,其史论价值、文学价值还有待深入探讨。本文试图厘清问题,补错纠正,展现该著在学术史上应有的价值与意义。

关键词：《西洋朝贡典录》黄省曾郑和下西洋

政策组合复杂程度如何影响政策效能——基于新能源汽车推广的分析

在线全文

学校读者我要写书评

暂无评论

公共管理学报 2024年第1期21卷 41-55,169页

作者：何裕捷北京大学政府管理学院北京100871

政策组合复杂化是当代的重要现象。为研究政策组合复杂程度如何影响政策效能,本文在阐明复杂政策组合内涵的基础上,使用2003—2017年284个城市新能源汽车推广的面板数据进行实证分析。研究发现:(1)政策组合复杂程度与政策效能呈“倒U型... 详细信息

政策组合复杂化是当代的重要现象。为研究政策组合复杂程度如何影响政策效能,本文在阐明复杂政策组合内涵的基础上,使用2003—2017年284个城市新能源汽车推广的面板数据进行实证分析。研究发现:(1)政策组合复杂程度与政策效能呈“倒U型”关系。复杂程度适中的政策组合方能最大限度发挥政策效能,当复杂程度偏低或偏高时,政策效能将受到抑制。(2)不同维度的政策组合复杂性对政策效能的影响存在差异。政策工具数量正向影响政策效能;政策类型数量对政策效能的影响呈“U型”关系,整体上会削弱政策效能;政策领域数量对政策效能的影响呈“倒U型”关系,整体上有助于提升政策效能;参与部门数量对政策效能的影响是间接且正向的,其作用渠道是政策工具数量、政策类型数量、政策领域数量。(3)多元政策区位与多元政策时序在政策工具数量、政策类型数量、政策领域数量、参与部门数量影响政策效能的过程中发挥调节作用。本文深化了政策组合理论,为政策组合复杂性研究提供重要概念依据,明确了政策组合复杂程度与政策效能的基本关系模式,并发展出有关政策一致性、部门协同等问题的新认知。另外,本文还为新兴产业发展、能源转型、气候变化应对等复杂问题的解决提供了重要参考。

关键词：政策组合政策组合复杂程度政策效能新能源汽车推广碳排放

A Novel SAR Image Ship Small Targets Detection Method

在线全文

学校读者我要写书评

暂无评论

Journal of Computer and Communications 2021年第2期9卷 57-71页

作者： Yu Song Min Li Xiaohua Qiu Weidong Du yujie he Xiaoxiang Qi Xi’an Institute of High Technology Xi’an China School of Information and Communications National University of Defense Technology Xi’an China

To satisfy practical requirements of high real-time accuracy and low computational complexity of synthetic aperture radar (SAR) image ship small target detection, this paper proposes a small ship target detection method based on the improved You Only Look Once Version 3 (YOLOv3). The main contributions of this study are threefold. First, the feature extraction network of the original YOLOV3 algorithm is replaced with the VGG16 network convolution layer. Second, general convolution is transformed into depthwise separable convolution, thereby reducing the computational cost of the algorithm. Third, a residual network structure is introduced into the feature extraction network to reuse the shallow target feature information, which enhances the detailed features of the target and ensures the improvement in accuracy of small target detection performance. To evaluate the performance of the proposed method, many experiments are conducted on public SAR image datasets. For ship targets with complex backgrounds and small ship targets in the SAR image, the effectiveness of the proposed algorithm is verified. Results show that the accuracy and recall rate improved by 5.31% and 2.77%, respectively, compared with the original YOLOV3. Furthermore, the proposed model not only significantly reduces the computational effort, but also improves the detection accuracy of ship small target.

关键词： The SAR Images The Neural Network Ship Small Target Target Detection

现代学术转型中的道教史研究以许地山、傅勤家论著为核心的探讨

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国道教 2019年第2期 32-37页

作者：何昱杰首都师范大学历史学院

对于道教的研究,不仅是海外汉学家所乐道的内容,也是20世纪以来中国学者理解传统文化的重要门径。鲁迅就曾言:“中国的根柢全在道教”,“以此读史,有多种问题可以迎刃而解”。然而,鲁迅认知里的道教,实则是弥漫于社会最底层的各种愚昧... 详细信息

对于道教的研究,不仅是海外汉学家所乐道的内容,也是20世纪以来中国学者理解传统文化的重要门径。鲁迅就曾言:“中国的根柢全在道教”,“以此读史,有多种问题可以迎刃而解”。然而,鲁迅认知里的道教,实则是弥漫于社会最底层的各种愚昧、迷信、反理性的传统汇总后的一个代名词。后人想全面认识道教,仍需追溯其历史。

关键词：道教史研究学术转型许地山论著中国学者传统文化 20世纪汉学家