Results 21 to 30 of about 28,261 (190)

Ultrafast Catalytic Decomposition Reaction Using a ZIF‐67@Celluolose Nanofiber Composite‐Based Cobalt/ Nitrogen Co‐Doped Nanoporous Carbon for Water Treatment

open access: yesRare Metals, EarlyView.
ABSTRACT Recently, cobalt/nitrogen co‐doped materials have emerged as heterogeneous catalysts to activate peroxymonosulfate (PMS) and have been applied to advanced oxidation processes for environmental remediation. However, their recyclability and reusability remain major barriers to practical application.
Wen‐Kai Zhu   +11 more
wiley   +1 more source

光接入网链路状态信号相关性判据方法

open access: yesGuangtongxin yanjiu, 2019
针对二维光编解码接入网链路监测系统中多路距离相近用户信号叠加难以设置阈值的问题,提出了一种基于信号相关性的链路状态识别算法。该算法以正常信号为基准,对实时检测的信号进行信号相关性分析,根据带补偿自定义相关系数及系统的编码规则判断具体分支链路状态。搭建了32用户、3路等距实验系统,等距离链路断路个数为1时,相关系数为0.626 1;断路个数为2时,相关系数分别为0.342 1、0.386 5,均在阈值区间内。仿真结果表明 ...
郭浩   +8 more
doaj  

The Research of Global Stock Markets’ Complex Networks in the Time Slot Chosen by the PCA Method [PDF]

open access: yes, 2016
全球股票市场组成了一个关系交错的复杂网络系统,在全球一体化的经济背景下,网络的内部结构关系越来越紧密。如今,发达国家的经济增长乏力,新兴国家增速放缓,经济硬着陆的风险仍在,整体经济形势不容乐观,危机的脚步似乎越来越近。在这样的背景之下,通过对股票市场网络结构的研究,发现网络中的关键市场和关键联系,监管者便可以通过对这些关键结构实施重点的风险监控,投资者也可以关注这些关键结构的变化做出投资决策。 复杂网络作为一种对股票市场结构研究的方法,在其运用中,时间区间的不同将使网络呈现出不同的结构形态 ...
刘婷
core  

Characteristics of macrobenthic communities in the estuary of Dagujia River and its adjacent water areas in Yantai, Shandong [PDF]

open access: yes, 2016
为了解烟台大沽夹河河口及邻近海域大型底栖动物群落特征及受干扰情况,于2012年9月在上述区域设置12个采样点进行大型底栖动物群落调查和分析。对采集的生物样品进行物种鉴定、计数和称重,利用生物统计软件PRIMER计算优势度指数(Y)、Shannon-Wiener多样性指数(H')、Margalef丰富度指数(D)和Pielou均匀度指数(J),并进行等级聚类(CLUSTER)、非度量多维标度排序(non-metric multi-dimensional scaling,MDS)及丰度/生物量曲线 ...
周政权   +4 more
core   +1 more source

Challenges of Effective Wildlife Law Enforcement in Oyo and Lagos States, Nigeria 尼日利亚奥约州与拉各斯州野生动物执法有效实施所面临的挑战

open access: yesWildlife Letters, EarlyView.
Effective wildlife law enforcement is important in the drive for biodiversity conservation. This study examined the challenges of wildlife law enforcement in Oyo and Lagos States of Nigeria across four security outfits (Nigerian Police Force [NPF], Nigerian Customs Service [NCS], National Environmental Standards and Regulations Enforcement Agency ...
Oluwatosin Mercy Dada   +2 more
wiley   +1 more source

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  

Internal physiological drivers of leaf development in trees: Understanding the relationship between non‐structural carbohydrates and leaf phenology

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Plant phenology is crucial for understanding plant growth and climate feedback. It affects canopy structure, surface albedo, and carbon and water fluxes. While the influence of environmental factors on phenology is well‐documented, the role of plant intrinsic factors ...
Yunpeng Luo   +8 more
wiley   +1 more source

运用古地震数据分析布朗过程时间模型中强震复发间隔变异系数

open access: yesDizhen xuebao, 2018
在我国大陆广泛搜集到的45个地震序列的基础上,首先利用最大似然估计法计算出不同样本量地震序列的变异系数值,然后与其对应的断层源参数作相关性分析,并对具有不同样本量地震序列中的变异系数值进行标准化处理,进而计算得到一个通用的变异系数值(αc=0.37)。相关分析结果显示变异系数值与断层的长度和滑移速率呈负相关,在此基础上本文对通用变异系数值(αc=0.37)的应用进行了分析,通过对αc进行一倍标准差运算得到3个变异系数值(0.21,0.37,0.53),分别适用于特征性具有明显差异的活动断层.
Chun Hui   +4 more
doaj   +1 more source

Study on Corner-Fed Cavity-Backed Slot Dual-Polarized Antennas [PDF]

open access: yes, 2015
为了在2.4GHz频段WLAN中实现具有方向性辐射的MIMO技术,采用背腔环形缝隙结构辐射元,通过倒置正交微带线激励,设计具有一定方向性的正交双极化天线结构。为提高端口间的隔离度和辐射场的极化纯度,在馈线正对的另一侧共面加载尺寸完全一致的接地或不接地导体带条。在此基础上,采用角馈的方法以期进一步改善天线的性能,并对各种可能天线形态进行对比分析。具体内容如下。 (1)对于边馈情形(即馈线位置垂直平分矩形导体腔表面的直角边),可以发现,没有加载导体条时,较佳隔离度对应的频带要高于阻抗工作频带,且相隔距离较大。
谢昇
core  

The coordination of dehydration tolerance and avoidance in oaks is mediated by leaf habit across a precipitation gradient

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Forests worldwide are increasingly impacted by drought due to climate change, prompting plants to adapt through dehydration tolerance (DT) and avoidance (DA), two distinct physiological strategies.
Xingyun Liang   +11 more
wiley   +1 more source

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