Results 61 to 70 of about 106,544 (192)

预测沙波运移的谱分析模型 [PDF]

open access: yes, 2016
沙波运移预测是海洋开发必不可少的一环。通常采用非线性谱分析方法分析沙波实测资料从而预测沙波运移。然而这种方法仅是从统计的角度进行预测,它不包含水动力、加载风速、沙质底床性质等关键因素对沙波运移的影响。对此本文提出了一种谱分析模型解决此类问题。该模型基于沙波形状不变假设,引入波谱能量平均运移速度,考虑了台风产生的风浪和涌浪,利用波浪输沙理论计算台风期间的沙波运移,厘清了一般波流作用和台风作用引起的沙波位移。模型计算结果与实测数据吻合,可以用来预测10 ...
江文滨, 林缅, 曹高辉
core  

Polyphenol oxidase depletion in Nicotiana benthamiana enhances recombinant protein purification and preserves native protein integrity

open access: yesNew Phytologist, EarlyView.
Polyphenol oxidases (PPOs) depletion preserves endogenous proteins at their predicted molecular weights and enhances detectable enzymatic activities. (a) Less RbcL crosslinking in ppo mutant of Nicotiana benthamiana. Leaf extracts were incubated for 1 h, separated on protein gels, stained with Coomassie or analyzed by Western blot with the anti‐RbcL ...
Kaijie Zheng   +4 more
wiley   +1 more source

基于统计学习理论的支持向量机预测模型

open access: yes, 2014
针对测试人体脂肪含量相对比较复杂的问题,文章根据日常测试的包含14个特征值的样本数据,设计了一种基于统计学习理论的支持向量机预测方法。通过四种常用核函数和监测均方根误差与平方相关系数两项关键指标 ...
杨秀锋   +3 more
core   +1 more source

回归分析与灰色系统耦合用于水环境预测研究

open access: yes, 1999
探讨了半多元回归分析模型和灰色系统(GM(1,1))耦合应用于武汉市东湖水体预测的方法和技术。首先根据多年污染因子浓度监测资料分析建立了COD,BOD,TN,TP与人口,经济和捕鱼量之间的多元线性回归方程;之后根据人口,经济和鱼产量的历史资料,用GM(1,1)模拟拟合,再反推得到预测值;最后,将人口,经济和鱼产量的预测值代入多元线性回归方程和得到污染物浓度的未来值。
李植生   +5 more
core   +1 more source

尼泊尔Ms8.1大地震的预测和未来趋势研究

open access: yes, 2015
编者按:中国科学院力学研究所非线性力学国家重点实验室尹祥础,主要研究领域为地震力学和地震预报理论。承蒙盛意,将他近日的报告提供本刊发表。 作者简介:尹祥础,  1958 年毕业于清华大学第一届工程力学研究班, 1984 年在美国圣路易大学作访问学者, 多次赴昆士兰大学等参加合作研究. 中国地震局地震预测研究所研究员, 中国科学院力学研究所非线性力学国家重点实验室特聘研究员, 中国地震局地球物理研究所博士生导师,  ...
刘月, 尹祥础
core  

Cross‐stage single‐cell and spatial metabolome analyses reveal periderm specialization and tanshinone biosynthesis in Salvia miltiorrhiza roots

open access: yesNew Phytologist, EarlyView.
Biosynthesis and accumulation of tanshinones in the periderm of Salvia miltiorrhiza during secondary root growth. Summary Perennial herbs develop long‐lived roots that undergo repeated cycles of secondary growth, during which the periderm functions as a protective barrier and a major site of specialized metabolite accumulation.
Licheng Liu   +19 more
wiley   +1 more source

Navigating the Algorithmic State: Public Values and Citizens' Preferences of AI‐Driven Public Service Delivery

open access: yesPublic 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

基于灰色模型的电涌保护器老化预测研究

open access: yesDianci bileiqi, 2016
电涌保护器(SPD)在工作状态下会产生一定的泄漏电流,其泄漏电流的值可以反应SPD的老化程度。针对SPD的老化预测问题,利用其产生的泄漏电流,提出一种基于灰色预测模型的SPD老化预判方法。研究表明:灰色预测模型可以较好地应用于SPD泄漏电流的预测中,预测结果误差较小,具有较高的有效性和实用性,从而为SPD老化预判提供一种可能。此外,为电网电力系统中其他设备状态预判提供了一种崭新思路。
张红梅, 李佑光
doaj  

氢/空气预混平面火焰CARS温度测量

open access: yes, 2000
介绍了一套用于燃烧研究中对温度和成分浓度测量进行校准的氢/空气预混平面火焰燃烧4系统。采用氮CARS技术对氢/空气预混平面火焰温度进行了系统的测量,包括不同当量比条件下的温度分布,温度的纵向和横向空间分布。结果表明,氮CARS测温与氢/空气预混平面火焰的理论计算温度之间的误差为3.4%,而在燃烧炉表面上方1mm以上的空间属于火焰的温度均匀区,温度的不均匀性约为1.8%
赵建荣, 俞刚, 杨仕润, 韩百
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

Home - About - Disclaimer - Privacy