Results 71 to 80 of about 57,925 (177)
The underappreciated roles of fog and dew on vegetation and biocrusts
New Phytologist, EarlyView.Summary Fog and dew represent minor components of ecosystem water budgets in most ecosystems. However, fog and dew can play an essential role in ecosystem dynamics and are particularly important for water‐limited systems. In addition to serving as direct water inputs, fog and dew can influence microclimate and water redistribution, thereby promoting ...
Lixin Wang, Yue Li, Mengyun Sun, Na Qiao
wiley +1 more source
Zhongshan 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
日本东北MW9.0地震的PI模型参数设置与预测效能回溯性检验
Dizhen xuebao, 2018 以日本局部地区（32.0°N—46.0°N，136.0°E—148.0°E）为研究区域，应用图像信息（PI）方法，获得了不同计算参数模型下包含2011年3月11日日本东北MW9.0地震的多组预测窗热点图像。以0.5°×0.5°和1.0°×1.0°的网格尺度和5—10年预测窗长为主要参数变量，并以R值和受试者工作特征（ROC）方法检验不同参数模型下PI方法的预测效能。结果表明，多组参数模型下MW9.0地震所在预测窗内，其震中所在网格及其摩尔邻近网格均曾出现热点图像，表明PI方法可对日本东北MW9 ...
Cheng Song +5 more
doaj +1 more source
Analysis of Differentially Expressed Proteins in Self-Paired Sera of Advanced Non-small Cell Lung Cancer Patients Responsive to Gefin [PDF]
, 2009 Background and objective All the advanced NSCLC patients that received EGFR-TKI therapy will eventually relapse after a period of efficacy. The aim of this study is to investigate the serum biomarkers as potential predictive factors for the efficacy of ...
Ailin GUO +10 more
core
Public Administration, EarlyView.ABSTRACT As the public sector increasingly adopts AI‐powered automated decision systems (ADS), understanding how citizens experience and value ADS use in public decision‐making is both normatively and practically important. Therefore, we examine and compare the effects of seven attributes of public values on citizens' support for ADS adoption in two ...
Guimin Zheng +4 more
wiley +1 more source
Dianci 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
Application Study of the Stock Data Assistant Analysis Algorithm [PDF]
, 2015 股票市场受政治、经济和投资者心理等多种复杂因素的影响。虽然复杂，但经过分析简化仍能在海量数据中得到相应的信息。数据挖掘技术就是能够实现从海量数据中挖掘有用信息的新兴技术，其广泛应用于投资领域。本文以技术分析和基本分析两种股票分析方法为基础，针对股票分析和预测应用数据挖掘中的神经网络和关联规则建立相应的模型，并进行了实证分析和比较。论文主要工作包括以下两个方面： 1.针对BP神经网络算法在股市预测中存在的学习速度慢、容易陷入局部极小值、预测结果精度不高等问题，提出一种基于共轭梯度的BP神经网络算法 ...
魏朝东
core
Issue Attention in Public Opinion Polls: Pollsters as Agenda Responders and Agenda Setters
Policy 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
Design and Implementation of Oil and Gas Pipeline Energy Consumption Forecast System Based on SCADA System [PDF]
, 2015 随着我国油气管道事业的快速发展，原油、成品油、天然气管道局部已形成管网并形成集中调控，我国陆上长输油气管道总里程将近13万公里，笔者所在的工作单位北京油气调控中心承担着中国80％的油气管道的调控运行，但管道运行能耗处于较高水平，管道运行管理水平处于较低水平，国内油气管网优化运行技术较国外还存在较大差距,加之近期国际油价持续大跌，中石油等能源企业迫切需要降本增效和开源节流，通过技术手段节能降耗成为关注焦点。再者传统的个人经验式管理已无法满足日益增长的管理难度需要，为解决这一矛盾 ...
姜勇
core
There Is Always a Bigger Fish. Determinants of Power Perceptions in Swiss Biodiversity Policy
Policy 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