期刊文献+
共找到13,309篇文章
< 1 2 250 >
每页显示 20 50 100
Heimtextil 2026 sharpened its global market relevance by attracting more top-level decision-makers
1
《China Textile》 2026年第1期46-48,共3页
During 13 to 16 January 2026,with 148 participating nations,rising global relevance and a marked increase in visitor quality,Heimtextil 2026 stood for stability and reliability in a volatile market environment.Once ag... During 13 to 16 January 2026,with 148 participating nations,rising global relevance and a marked increase in visitor quality,Heimtextil 2026 stood for stability and reliability in a volatile market environment.Once again,3,000 exhibitors from across the globe placed their trust in the industry’s central platform in Frankfurt,presenting current collections,materials and textile solutions for holistic interior design to approximately 47,000 buyers.Under the motto“Lead the Change”,Heimtextil brought evolving market dynamics,Artificial Intelligence(AI)and new business opportunities to life.The focus was on progressive design approaches,visionary talents,functional textiles and new hospitality concepts shaping the future of interior design.A tangible sense of confidence and a clear commitment to Heimtextil as a strong industry partner resonated throughout the exhibition halls. 展开更多
关键词 holistic interior design rising global relevance participating nations volatile market environment top level decision makers visitor quality reliability global market relevance
在线阅读 下载PDF
RBAD:The first database dedicated alterations of blood RNA in individuals with Alzheimer’s disease and their clinical relevance
2
作者 Tingting Duan Jinyu Chu +10 位作者 Jinquan Li Shiyao Pan Dan Liu Guirong Cheng Yu Luo Wen Zhou Zhiming Wang Wei Tan Qiong Wu Yan Zeng Feifei Hu 《Neural Regeneration Research》 2026年第6期2553-2562,共10页
Alzheimer’s disease-associated transcriptomic landscapes have been defined in brain tissue.However,changes in blood RNA and their clinical relevance remain poorly understood.In this study,we developed an RNA profile ... Alzheimer’s disease-associated transcriptomic landscapes have been defined in brain tissue.However,changes in blood RNA and their clinical relevance remain poorly understood.In this study,we developed an RNA profile based on 1468 blood samples from both human and mouse studies,which include bulk RNA sequencing(RNA-seq),microRNA-seq,and single-cell RNA-seq data.We developed a comprehensive analysis pipeline that conducted over 11 million comparisons and correlations to identify more than 20,000 blood features.With these findings,we established a blood RNA database related to Alzheimer’s disease,RNAs in Blood of AD(RBAD,http://www.bioinform.cn/RBAD/).Using RBAD,we initially validated well-established Alzheimer’s disease-related pathways,including olfactory transduction.We then observed a decrease in both the proportion and functionality of erythroid cells,likely attributed to their elevated CD45 levels and interactions with GZMK^(+)CD8^(+)T cells.Furthermore,we identified 449 blood RNAs linked to patients’overall survival,along with two mRNAs(H4C3 and CTU1)associated with cognitive decline.In summary,RBAD is the first web-based analysis platform dedicated to investigating blood RNA changes in Alzheimer’s disease,and provides valuable insights into potential peripheral biomarkers and pathogenic mechanisms related to Alzheimer’s disease. 展开更多
关键词 Alzheimer’s disease biomarker BLOOD clinical relevance erythroid cells GZMK^(+)CD8^(+)T cells high throughput sequencing mild cognitive impairment olfactory transduction RNA
暂未订购
Research on Pragmatic Relevance and Translation of Tea Culture Terminology from the Perspective of Digitalized Teaching
3
作者 Jieying Hu 《Journal of Contemporary Educational Research》 2025年第9期115-122,共8页
This paper focuses on the teaching of tea culture terminology translation against the backdrop of digital transformation in education.Based on the theory of pragmatic relevance,the research emphasizes shifting the foc... This paper focuses on the teaching of tea culture terminology translation against the backdrop of digital transformation in education.Based on the theory of pragmatic relevance,the research emphasizes shifting the focus of translation from static linguistic equivalence to more dynamic communicative effectiveness.This paper advocates the flexible application of various strategies.These include literal translation,free translation,transliteration with annotation,and adaptive translation based on the target audience’s cognitive context.The paper innovatively proposes digitally-enabled teaching implementation paths,including constructing modular online courses,building intelligent terminology case databases,conducting cloud-based workshops on translation,and implementing industry-academia collaborative project practices.These aim to reshape the teaching process utilizing digital technology,effectively cultivating higher vocational students’cultural communication abilities and practical translation skills,thereby providing high-quality language service talent support for the internationalization of Chinese tea culture. 展开更多
关键词 Tea culture terminology Pragmatic relevance Translation strategies Digitalized teaching Business English
在线阅读 下载PDF
An Explainable Deep Learning Framework for Kidney Cancer Classification Using VGG16 and Layer-Wise Relevance Propagation on CT Images
4
作者 Asma Batool Fahad Ahmed +4 位作者 Naila Sammar Naz Ayman Altameem Ateeq Ur Rehman Khan Muhammad Adnan Ahmad Almogren 《Computer Modeling in Engineering & Sciences》 2025年第12期4129-4152,共24页
Early and accurate cancer diagnosis through medical imaging is crucial for guiding treatment and enhancing patient survival.However,many state-of-the-art deep learning(DL)methods remain opaque and lack clinical interp... Early and accurate cancer diagnosis through medical imaging is crucial for guiding treatment and enhancing patient survival.However,many state-of-the-art deep learning(DL)methods remain opaque and lack clinical interpretability.This paper presents an explainable artificial intelligence(XAI)framework that combines a fine-tuned Visual Geometry Group 16-layer network(VGG16)convolutional neural network with layer-wise relevance propagation(LRP)to deliver high-performance classification and transparent decision support.This approach is evaluated on the publicly available Kaggle kidney cancer imaging dataset,which comprises labeled cancerous and noncancerous kidney scans.The proposed model achieved 98.75%overall accuracy,with precision,recall,and F1-score each exceeding 98%on an independent test set.Crucially,LRP-derived heatmaps consistently localize anatomically and pathologically significant regions such as tumor margins in agreement with established clinical criteria.The proposed framework enhances clinician trust by delivering pixel-level justifications alongside state-of-the-art predictive performance.It facilitates informed decision-making,thereby addressing a key barrier to the clinical adoption of DL in oncology. 展开更多
关键词 Explainable artificial intelligence(XAI) deep learning VGG16 layer-wise relevance propagation(LRP) kidney cancer medical imaging
在线阅读 下载PDF
面向高光谱遥感图像的MMRI-Boruta特征选择算法
5
作者 张婧 孔霄 +2 位作者 曹峰 张超 李德玉 《郑州大学学报(理学版)》 北大核心 2026年第1期72-77,共6页
高光谱遥感图像特征选择旨在从高维光谱特征集中选择最优光谱特征子集,以消除冗余光谱特征来提高高光谱遥感图像分析的效率和精度。由此提出了一种混合型特征选择算法MMRI-Boruta,该算法首先对过滤式MRI特征选择算法进行改进,通过引入... 高光谱遥感图像特征选择旨在从高维光谱特征集中选择最优光谱特征子集,以消除冗余光谱特征来提高高光谱遥感图像分析的效率和精度。由此提出了一种混合型特征选择算法MMRI-Boruta,该算法首先对过滤式MRI特征选择算法进行改进,通过引入方差定义新的特征重要性评价指标,然后利用封装式的Boruta算法实现特征子集的进一步优化。所提算法结合了过滤式和封装式两种特征选择算法的优点,更易于获取最优特征子集。为了验证该算法的有效性,使用了两个经典的高光谱遥感图像数据集Indian Pines和Salinas对算法的性能进行了测试,实验结果表明该算法优于对比算法。 展开更多
关键词 高光谱遥感图像 特征选择 互信息 相关性
在线阅读 下载PDF
我国大白菜用农药登记现状及问题分析
6
作者 牛建群 刘士亮 +3 位作者 杨素梅 赵富豪 宿培萌 王海燕 《农药科学与管理》 2026年第1期32-37,共6页
本文统计梳理了我国大白菜用农药的登记数量、产品毒性、剂型和农药组分等情况。针对当前大白菜用农药登记存在的问题进行了分析,并提出相关建议,旨在推动我国大白菜产业实现绿色高效发展。
关键词 大白菜 农药登记 问题分析 相关建议
在线阅读 下载PDF
基于深度神经网络的重症监护室脓毒症患者死亡风险预测模型分析
7
作者 余雷 孙懿 +1 位作者 华金铭 李腊全 《山东大学学报(理学版)》 北大核心 2026年第1期26-35,共10页
提出基于变量选择网络(variable selection networks,VSN)和门控残差网络(gated residual networks,GRN)相结合的深度神经网络(deep neural network,DNN)模型,用于预测重症监护室(intensive care unit,ICU)脓毒症患者30 d内的死亡风险,... 提出基于变量选择网络(variable selection networks,VSN)和门控残差网络(gated residual networks,GRN)相结合的深度神经网络(deep neural network,DNN)模型,用于预测重症监护室(intensive care unit,ICU)脓毒症患者30 d内的死亡风险,并对模型的可解释性进行深入分析。在重症医学数据库中利用随机森林算法筛选43个重要特征,利用本文提出的模型评估死亡风险,并采用移除再训练(remove and retrain,ROAR)方法选出一种最佳的可解释性方法对结果进行解释。测试结果显示,本文提出的模型的预测性能优于其他机器学习模型,受试者工作特征曲线面积(area under receiver operating characteristic curve,AUROC)为0.967。利用ROAR方法分析中,相关性分数逐层传播(layer-wise relevance propagation,LRP)方法的AUROC从0.967下降到0.828。利用LRP方法对本文提出的模型进行可解释性分析后,确定查尔森合并症评分为最重要的特征,同时器官衰竭评分、年龄、呼吸频率也对重症监护室脓毒症患者的死亡风险有较大影响。 展开更多
关键词 脓毒症 死亡风险预测 深度神经网络 移除再训练 相关性分数逐层传播
原文传递
浮游植物群落与水质污染相关性数值模拟研究
8
作者 于惠莉 《环境科学与管理》 2026年第1期42-46,共5页
借助数值模拟分析方法分析浮游植物群落与水质污染之间的相关关系。以某水库为原型,通过检测获取浮游植物群落数据和水质污染数据。构建描述浮游植物群落与水质污染之间相关性的数学模型。针对模型划分网格,模拟相关性数学模型在不同条... 借助数值模拟分析方法分析浮游植物群落与水质污染之间的相关关系。以某水库为原型,通过检测获取浮游植物群落数据和水质污染数据。构建描述浮游植物群落与水质污染之间相关性的数学模型。针对模型划分网格,模拟相关性数学模型在不同条件下的变化情况。结果表明:重金属污染、有机污染与浮游植物群落丰富度之间呈现负相关性,营养盐污染与丰富度之间呈现正相关性,pH值与丰富度先呈现正相关性,后呈现负相关性。重金属污染、有机污染、pH值对浮游植物群落多样性指数均有一定的抑制性,营养盐污染对浮游植物群落具有一定的促进作用。 展开更多
关键词 浮游植物群落 水质污染 相关性 模型构建 数值模拟
在线阅读 下载PDF
末端瓣膜式高压注射型经外周插管的中心静脉导管在胸部肿瘤患者强化CT检查中的应用效果
9
作者 张立 邢绍芝 +2 位作者 胡琪汭 邓天华 孙晓娟 《中国当代医药》 2026年第3期75-78,84,共5页
目的探讨Power PICC SOLO在胸部肿瘤患者强化CT检查中的应用效果。方法选取滨州医学院附属医院2022年9月至2023年2月进行化学药物治疗的胸部肿瘤患者作为研究对象,采用随机数字表法分为观察组(30例)和对照组(30例),观察组采用Power PICC... 目的探讨Power PICC SOLO在胸部肿瘤患者强化CT检查中的应用效果。方法选取滨州医学院附属医院2022年9月至2023年2月进行化学药物治疗的胸部肿瘤患者作为研究对象,采用随机数字表法分为观察组(30例)和对照组(30例),观察组采用Power PICC SOLO作为推注造影剂通路,对照组采用专用耐高压静脉留置针(20G)作为推注造影剂通路。观察比较两组时间差异,并发症发生情况,患者满意度及强化CT扫描清晰度。结果观察组评估血管、导管至开始推注造影时间以及CT检查后处理通路时间、总耗时均短于对照组,差异有统计学意义(P<0.05);观察组的血管并发症总发生率低于对照组,差异有统计学意义(P<0.05);观察组的患者总满意度高于对照组,差异有统计学意义(P<0.05);观察组的图像噪声、图像清晰度评分均高于对照组,差异有统计学意义(P<0.05)。结论Power PICC SOLO导管在强化CT检查中的使用,节约了护士时间,同时缩短了患者的等待时间,减少造影剂外渗等并发症,提高造影显像清晰度,提高了患者满意度,值得临床借鉴应用。 展开更多
关键词 末端瓣膜式高压注射型经外周插管的中心静脉导管 胸部肿瘤 强化CT 检查期间相关时间 血管并发症 满意度 图像质量评分
暂未订购
Estimation of illumination chromaticity via adaptive reduced relevance vector machine
10
作者 丁二锐 曾平 +1 位作者 姚勇 王义峰 《Journal of Southeast University(English Edition)》 EI CAS 2007年第2期202-205,共4页
A new regression algorithm of an adaptive reduced relevance vector machine is proposed to estimate the illumination chromaticity of an image for the purpose of color constancy. Within the framework of sparse Bayesian ... A new regression algorithm of an adaptive reduced relevance vector machine is proposed to estimate the illumination chromaticity of an image for the purpose of color constancy. Within the framework of sparse Bayesian learning, the algorithm extends the relevance vector machine by combining global and local kernels adaptively in the form of multiple kernels, and the improved locality preserving projection (LLP) is then applied to reduce the column dimension of the multiple kernel input matrix to achieve less training time. To estimate the illumination chromaticity, the algorithm is trained by fuzzy central values of chromaticity histograms of a set of images and the corresponding illuminants. Experiments with real images indicate that the proposed algorithm performs better than the support vector machine and the relevance vector machine while requiring less training time than the relevance vector machine. 展开更多
关键词 color constancy illumination estimation chromaticity histogram adaptive reduced relevance vector machine
在线阅读 下载PDF
NEW METHOD FOR WHITE BLOOD CELL DETECTION BASED ON RELEVANCE VECTOR MACHINE
11
作者 王敏 乔立山 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2010年第3期269-274,共6页
A new method for the white blood cell (WBC) detection is presented based on the relevance vector machine (RVM). Firstly,the sparse relevance vectors (RVs) are obtained while fitting the 1-D histogram by RVM. The... A new method for the white blood cell (WBC) detection is presented based on the relevance vector machine (RVM). Firstly,the sparse relevance vectors (RVs) are obtained while fitting the 1-D histogram by RVM. Then,the needed threshold value is directly selected from these limited RVs. Finally,the entire connective WBC regions are segmented from the original image. The method is used for the WBC detection. It reduces the interference induced by the illumination and the staining. It has advantages of the high computation efficiency and the no extra parameter setting. Experimental results demonstrate good performances of the method. 展开更多
关键词 image segmentation detectors white blood cell detection relevance vector machine
在线阅读 下载PDF
Online composite shape recognition based on relevance feedback
12
作者 王强 孙正兴 《Journal of Southeast University(English Edition)》 EI CAS 2005年第2期153-158,共6页
This paper describes a novel method of online composite shape recognition interms of the relevance feedback technology to capture a user's intentions incrementally, and adynamic user modeling method to adapt to va... This paper describes a novel method of online composite shape recognition interms of the relevance feedback technology to capture a user's intentions incrementally, and adynamic user modeling method to adapt to various users' styles. First, the relevance feedback isadapted to refine the recognition results and reduce the ambiguity incrementally based on theestablishment of a feature-based vector model of a user's sketches. Secondly, a dynamic usermodeling is introduced to model the user's sketching habits based on recording and analyzinghistorical information incrementally. A model-based matching strategy is also employed in the methodto recognize sketches dynamically. Experiments prove that the proposed method is both effective andefficient. 展开更多
关键词 sketchy-based user interface online composite shape recognition dynamicuser modeling relevance feedback
在线阅读 下载PDF
盐酸二甲双胍有关物质检查及含量测定方法的优化
13
作者 郑丹 梁蔼殷 +4 位作者 赖泽锋 叶勇 蓝馨 覃晓君 杨兴业 《华西药学杂志》 北大核心 2026年第1期69-72,共4页
目的采用HPLC法优化盐酸二甲双胍的有关物质检查和含量测定方法。方法采用Agilent 5 HC-C18柱,以甲醇-庚烷磺酸钠溶液为流动相、检测波长218 nm、进样量10μL进行有关物质检查;以磷酸盐缓冲液-乙腈(85:15)为流动相、检测波长233 nm、进... 目的采用HPLC法优化盐酸二甲双胍的有关物质检查和含量测定方法。方法采用Agilent 5 HC-C18柱,以甲醇-庚烷磺酸钠溶液为流动相、检测波长218 nm、进样量10μL进行有关物质检查;以磷酸盐缓冲液-乙腈(85:15)为流动相、检测波长233 nm、进样量20μL进行含量测定。结果所用方法线性关系良好(r>0.9999),精密度及回收率良好(RSD≤2.00%)。结论开发了一种灵敏度高、专属性强的盐酸二甲双胍质量分析方法。 展开更多
关键词 盐酸二甲双胍 高效液相色谱法 有关物质 含量测定 双氰胺 优化
原文传递
Understanding advertisements from the perspective of relevance theory
14
作者 韦晓保 《Sino-US English Teaching》 2009年第7期42-46,共5页
This paper approaches advertisements on the basis of relevant theory. It elaborates how the advertiser as addresser in communication succeed in conveying his intention for publicity and how the recipient as addressee ... This paper approaches advertisements on the basis of relevant theory. It elaborates how the advertiser as addresser in communication succeed in conveying his intention for publicity and how the recipient as addressee takes advantage of different types of relevant devices in reasoning out the communicative purposes from four different angles, namely, non-stereotypical interpretation of advertisements, psychological requirements of the recipient as addressee in advertisements, advertisements as explicit information and the situational approach to implicit meanings of advertisements. It aims at providing guidance for advertisement planning and translation by means of the exposure of rules underlying advertisements. 展开更多
关键词 relevance theory ADVERTISEMENT non-stereotypical relations explicit information implicit information
在线阅读 下载PDF
Research on comprehensive evaluation of six properties of equipment product with relevant attributes based on DEMATEL-ANP-ELECTRE
15
作者 QIN Jian MEI Wenhui 《Journal of Systems Engineering and Electronics》 2026年第1期318-326,共9页
The comprehensive evaluation of six properties for equipment product is an important basis for their quality control,and their correlative relationship among six properties will affect their quality level.To understan... The comprehensive evaluation of six properties for equipment product is an important basis for their quality control,and their correlative relationship among six properties will affect their quality level.To understand their correlative relationship among six properties,this paper firstly combines group evaluation with decision-making trial and evaluation laboratory(DEMATEL)model,and develops the optimization model based on group consensus to form six influent relationship matrices.Secondly,group consensus matrix is used to design super network hierarchy matrix,and the weights of six properties with relevant environment is also proposed.Thirdly,the elimination and choice translating reality(ELECTRE)model is used to make comprehensive evaluation,and an example is used to compare the results under two kinds of conditions,and illustrate the effect of the weights of six properties on the priority of equipment products. 展开更多
关键词 six properties decision-making trial and evaluation laboratory elimination and choice translating reality RELEVANT
在线阅读 下载PDF
To Split or to Unify?-A Comparative Study on Functional Equivalence Translation Theory and Relevance Translation Theory
16
作者 刘静 孔燕 《海外英语》 2012年第22期157-158,共2页
Functional equivalence,a focus in the translation studies,has been bombarded with numerous criticisms.Meanwhile,relevance translation theory,proposed by Ernst-August Gutt,offers a united theoretical framework for tran... Functional equivalence,a focus in the translation studies,has been bombarded with numerous criticisms.Meanwhile,relevance translation theory,proposed by Ernst-August Gutt,offers a united theoretical framework for translation studies.The development of the translation theories does not rely on the appearance of a brand-new theory,but on the successful connection among various theories.To split or to unify,it is a question and it will direct the further development of translation studies.Analyzing the similarities and differences between these two theories,the author are striving for a unity of them and striking a better way to approach translation studies. 展开更多
关键词 FUNCTIONAL EQUIVALENCE relevance theory UNIFY
在线阅读 下载PDF
类器官/器官芯片技术在生理药动学建模中的应用
17
作者 钟丽娜 穆耶赛尔·阿里甫 +2 位作者 何庆烽 朱校 相小强 《中国现代应用药学》 北大核心 2026年第1期146-154,共9页
传统细胞模型和动物模型在模拟人体组织的复杂性和生理相关性上有一定的局限,从而限制了临床转化效率与生理药动学模型的预测能力。类器官和器官芯片作为药物研究的新工具,更贴近体内生理过程,可模拟机体复杂的机械环境和生理反应。本... 传统细胞模型和动物模型在模拟人体组织的复杂性和生理相关性上有一定的局限,从而限制了临床转化效率与生理药动学模型的预测能力。类器官和器官芯片作为药物研究的新工具,更贴近体内生理过程,可模拟机体复杂的机械环境和生理反应。本文综述了类器官和器官芯片在生理药动学建模方面的研究进展,展示了这种结合在促进临床前研究向临床阶段转化并提升预测能力方面的潜力,从而为药物开发和评估提供新的视角。 展开更多
关键词 类器官 器官芯片 生理药动学模型 体内相关性
原文传递
长三角地区产业结构优化与绿色发展水平互动关联分析
18
作者 汪德慧 乔伟峰 +1 位作者 唐娟 李琛 《长江流域资源与环境》 北大核心 2026年第1期43-55,共13页
在“质量强国”和“美丽中国”的建设背景下,协同推进区域产业转型升级与绿色发展成为必要之举。以长三角41市为研究对象,运用面板向量自回归(PVAR)模型,借助脉冲响应函数(IRF)和方差分解等方法,分析2006~2019年长三角地区产业结构与绿... 在“质量强国”和“美丽中国”的建设背景下,协同推进区域产业转型升级与绿色发展成为必要之举。以长三角41市为研究对象,运用面板向量自回归(PVAR)模型,借助脉冲响应函数(IRF)和方差分解等方法,分析2006~2019年长三角地区产业结构与绿色发展的双向互动关系,结果表明:(1)长三角地区产业结构整体向高级化和合理化方向演变,但地区内部仍不平衡、不协调。上海、苏南、浙北地区部分城市及安徽少数城市实现了产业结构合理化与高级化的同步提升,地区差异显著;(2)长三角地区绿色发展水平整体呈上升态势,但存在平稳上升和波动式前进的差异,上海和各省省会城市的绿色发展水平持续提升,安徽省相对滞后,波动明显。技术进步是制约长三角地区绿色发展水平提升的主要因素;(3)长三角地区产业结构优化与绿色发展间呈现“短期抑制、长期协同”的动态特征,并且两者均存在显著的自我驱动性,其中产业结构合理化对绿色发展的解释力度比高级化更强。研究结论可为长三角地区高质量协同发展提供科学参考,同时为探索经济增长与生态改善的双赢发展模式提供理论支撑。 展开更多
关键词 产业结构优化 绿色发展 互动关联 长三角地区
原文传递
妊娠期高血压疾病患者胎盘微循环参数与不良妊娠结局的关系
19
作者 李威 童龙霞 +2 位作者 曾悦 郭晓丽 何国琳 《现代妇产科进展》 2026年第1期30-34,共5页
目的:探究妊娠期高血压疾病(HDP)患者的胎盘微循环参数,即子宫动脉血流搏动指数(PI)、阻力指数(RI)、收缩期最大流速与舒张末期流速之比(S/D)和时间平均流速(TAV)与不良妊娠结局的关系。方法:选取2022年1月至2025年1月四川大学华西第二... 目的:探究妊娠期高血压疾病(HDP)患者的胎盘微循环参数,即子宫动脉血流搏动指数(PI)、阻力指数(RI)、收缩期最大流速与舒张末期流速之比(S/D)和时间平均流速(TAV)与不良妊娠结局的关系。方法:选取2022年1月至2025年1月四川大学华西第二医院收治的142例妊娠期初发高血压疾病孕妇纳入研究组,另选取同期同孕周住院的62例非妊娠期高血压疾病的孕妇作为健康组。采用超声检测胎盘微循环参数:PI、RI、S/D和TAV。比较健康组和研究组胎盘微循环参数PI、RI、S/D、TAV差异和不良妊娠结局发生率,以及妊娠良好组和妊娠不良组胎盘微循环参数PI、RI、S/D和TAV差异。ROC分析胎盘微循环参数PI、RI、S/D和TAV对不良妊娠结局的预测价值。Spearman相关性分析PI、RI、S/D和TAV与妊娠结局的关系。结果:与健康组相比,研究组的PI、RI、S/D和不良妊娠结局发生率高,TAV低,差异均有统计学意义(均P<0.05);与妊娠良好组相比,妊娠不良组的PI、RI、S/D和不良妊娠结局发生率高,TAV低,差异均有统计学意义(均P<0.05)。ROC结果显示,PI、RI、S/D和TAV联合检测诊断妊娠高血压疾病患者不良妊娠结局的AUC为0.931,显著高于单独检测(P<0.05)。根据Spearman相关性分析结果,PI、RI、S/D与不良妊娠结局呈显著正相关,TAV与不良妊娠结局呈显著负相关(r=0.669、0.687、0.631、0.735,均P<0.001)。结论:妊娠期高血压疾病患者胎盘微循环参数PI、RI、S/D显著高于正常孕妇,TAV显著低于正常孕妇,胎盘微循环参数联合检测对不良妊娠结局有较高预测价值。 展开更多
关键词 妊娠期高血压疾病 胎盘微循环参数 妊娠结局 相关性 诊断价值
暂未订购
数据驱动的发动机剩余使用寿命直接预测
20
作者 梁佳鑫 马志赛 +1 位作者 丁千 隋鑫 《振动.测试与诊断》 北大核心 2026年第1期55-62,215,216,共10页
针对发动机剩余使用寿命(remaining useful life,简称RUL)间接预测时失效阈值难以准确设置、直接预测时监测数据与RUL之间复杂映射关系难以建立的问题,提出了一种改进的发动机RUL直接预测方案。首先,为降低监测数据中的噪声干扰,在多传... 针对发动机剩余使用寿命(remaining useful life,简称RUL)间接预测时失效阈值难以准确设置、直接预测时监测数据与RUL之间复杂映射关系难以建立的问题,提出了一种改进的发动机RUL直接预测方案。首先,为降低监测数据中的噪声干扰,在多传感器数据融合阶段引入滑动平均滤波对一维健康指标进行降噪以提升数据质量;其次,为改善退化模式特征的提取效果,提出指数函数与二次多项式函数混合交替的优化策略,通过相关向量机模型学习得到退化模式特征与RUL之间的直接映射关系,实现数据驱动的发动机RUL在线直接预测;最后,基于航空发动机的仿真数据集对提出方案的有效性进行验证。结果表明,所提出的直接预测方案无需设置失效阈值或估计未知的健康状态,能够显著提升发动机RUL预测精度,其均方根误差和Score评分函数指标值均有明显降低,有助于避免发动机服役后期的滞后预测问题。 展开更多
关键词 剩余使用寿命 特征提取 相关向量机 数据驱动方法
在线阅读 下载PDF
上一页 1 2 250 下一页 到第
使用帮助 返回顶部