Results 71 to 80 of about 57,483 (180)

鄂尔多斯盆地姬塬地区长6 储层矿物含量与孔隙度的线性关系 [PDF]

open access: yes, 2019
矿物含量是影响储层物性的重要因素之一。为了较全面地分析不同类型矿物含量对储层孔隙度的影响,以鄂尔多斯盆地姬塬地区长6 砂岩储层为例,探索性地运用多元逐步线性回归法分析了石英含量(x1)、长石含量(x2)、岩屑含量(x3)、绿泥石含量(x4)、伊利石含量(x5)、高岭石含量(x6)、硅质含量(x7)以及铁方解石含量(x8)与孔隙度(y)的关系,建立了矿物含量(xi)与孔隙度(y)之间的回归模型:y = 21.131-0.086 x2-0.113 x3-0.554 x4-0.370 x5-0.199 x6 ...
李小燕
core  

The Emotional Valence Paradox in Social media: A Computational Linguistic Analysis of How Sentiment, Emotion, and Content Domain Predict Social Comparisons on Rednote

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT This computational linguistic study analyzes 8743 Rednote posts to examine how sentiment, emotion, and content domain collectively shape social comparison dynamics on social media. We identify four key findings: (1) an emotional gradient, where upward comparison content exhibits the highest sentiment scores and downward comparison the lowest; (
Michelle Mingyue Gu   +7 more
wiley   +1 more source

Issue Attention in Public Opinion Polls: Pollsters as Agenda Responders and Agenda Setters

open access: yesPolicy Studies Journal, EarlyView.
ABSTRACT Polling organizations, like other policy actors, must prioritize certain issues. We argue that, for normative and financial reasons, pollsters prioritize issues that are viewed as important by other institutions and the public, leading them to focus survey questions on issues that are on congressional and media agendas, and which are public ...
Qian Zhang   +2 more
wiley   +1 more source

肝功能试验综合预测肝癌病人的肝储备功能

open access: yesZhongshan Daxue xuebao. Yixue kexue ban, 1995
用11项肝功能试验预测103例原发性肝癌合并肝硬变病人的手术前肝储备功能。对照术后恢复状况,对这些检查采用多因素判别法(Fisher's法)分析。推导出两个方程式。用Y1方程式预测病人术后是否出现肝功能损害,Y2方程式预测肝功能损害的程度。用方程式回代,两个方程式的预测准确率分别为88.0%和83.1%。为了更准确地预测肝储备功能,我们设计了二步判别法,其预测敏感性、准确性和阴性预测值均高于Pugh法(P<0.05)。再用此法对另外一组病人(n=60)作术前预测,准确率分别为83.3%和77.8%。
doaj  

基于支持向量机回归法的绝缘子污闪电压预测研究

open access: yesDianci bileiqi, 2014
为探讨污闪电压的有效预测方法,采用支持向量机回归方法,建立盐密、灰密与污闪电压的关系模型,对污闪电压进行预测。实例分析表明,其预测结果与实测结果的误差很小,表明支持向量机是一种非常有前景的预测工具。
丁龙   +4 more
doaj  

Design and Implementation of Traffic Jam Status System Based On JAVA [PDF]

open access: yes, 2016
摘要 随着城市经济的发展,车辆剧增,出现的交通阻塞、交通事故发生频率高,交通环境污染,交通治安混乱等一系列问题,严重影响着当前城市经济的发展和人民的生活,而同时交通设施的建设存在普遍滞后的状况,解决这些问题是当前所需,也是刻不容缓的。通过建设智能道路交通管理系统,运用科学化、现代化的交通管理手段提升道路交通管理服务水平,实现交通管理“智能化”,将极大地提高交通管理的效率,满足城市交通可持续发展的需要。 第一代交通自动管理系统采用无线遥感、红外、雷达等方式来获取环境信息。并传达给指挥人员 ...
文静
core  

There Is Always a Bigger Fish. Determinants of Power Perceptions in Swiss Biodiversity Policy

open access: yesPolicy Studies Journal, EarlyView.
ABSTRACT The Advocacy Coalition Framework (ACF) views power as crucial in policy processes, but the nature of coalition power, its determinants, and how to empirically measure it remain understudied. In this article, we use a mixed method approach and social network analysis to explore power relationships in the biodiversity policy subsystem in ...
Alix d'Agostino   +2 more
wiley   +1 more source

结合预测方法在避雷器带电测试中的应用

open access: yesDianci bileiqi, 2012
MOA在运行电压下通过的电流大小,可反映其绝缘性能或其电阻片的非线性性能的好坏。周期试验的数据无法对MOA的劣化趋势和使用寿命做出可靠量化预测。介绍了将等维新息灰色预测和BP神经网络通过最优加权法进行结合的一种预测方法,并将其应用于避雷器带电测试中对泄漏电流进行预测。MOA的阻性电流预测实例表明了该预测方法的有效性和实用性,为状态检修中其他试验项目的数据分析提供了一种新的思路。
刘凯, 刘方, 刘岩, 江礓
doaj  

Study on Influences of Subway Construction on Neighboring Surface and Buildings [PDF]

open access: yes, 2016
近年来,我国城市化进程加快,城市地铁建设发展迅猛,为缓解城市交通拥堵发挥了重要作用。然而,地铁大多位于城市繁华地区,地面建筑物林立,施工对周边建筑物所产生影响也表现得越来越突出。本文以厦门市轨道交通1号线工程为背景,在对实测变形监测资料详细分析的基础之上,研究了地铁施工引发周边建筑地基及地表变形的预测方法,总结了地铁施工引发周边建筑地基变形的影响因素与规律,提出了适用于厦门地区地铁施工对周边建筑物影响的控制指标及安全评估方法。主要研究内容及成果如下: (1)根据实测数据统计 ...
张佳
core  

Revisiting Pre-Trained Models for Chinese Natural Language Processing

open access: yes, 2020
Bidirectional Encoder Representations from Transformers (BERT) has shown marvelous improvements across various NLP tasks, and consecutive variants have been proposed to further improve the performance of the pre-trained language models. In this paper, we
Che, Wanxiang   +5 more
core   +1 more source

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