针对舰船运动的非平稳性特征,基于承认舰船运动数据之间具有相关性的假设,提出采用时间序列分解模型的数学方法实现对舰船运动的短期预报.根据时间序列分析的理论和方法,将舰船运动的时间序列分解为趋势项、周期项和平稳随机项.本文采用样本均值提取趋势项,基于傅里叶级数展开理论提取周期项,利用自回归模型(AR)拟合剩余的平稳随机项.本文基于实测的舰船运动数据进行预报,预测值与实测值十分吻合,均方根误差较小,预报
Air quality in Northern China is notoriously poor and recently has become an issue associated with increasing social unrest.To examine the regional pollution patterns,a PM2.5 (aerosol particle with ae
A total of 87 daily PM2.5 samples were collected in the urban area of Suzhou city during 2015,representing spring,summer,autumn,winter,respectively.Mass concentration of PM2.5 was analyzed gravimetric
Photocatalysis is an effective and promising technique for gaseous pollutants removal at low concentration levels,and it has attracted considerable attention in the past few decades [1].However,most o
In this study,we demonstrated that the reactive species generation of Bi2MoO6 under visible light can be regulated by Bi self-doping via a simple soft-chemical method.Density functional theory calcula
High intensity measurements of water-soluble organic carbon (WSOC) in PM2.5 were conducted at Yellow River Delta (YRD),North China,from 29 May to 1 July,2013.On average,concentration of WSOC was 3.09
Hourly particulate matter mass concentrations and meteorological parameters,recorded by the China National Environmental Monitoring Center (CNEMC) and China Observatory,between June 2013 and March 201
As a water-soluble phospholipid,L-α-Glycerophosphocholine (GPC for short) is naturally exist in the body of human and animals[1].It can be used for treating brain mental illness such as alzheimer’s di
Black carbon (BC) is a strong light absorbing material in the fine Particulate Matter (PM) and has been often mixed with other toxic constituents,such as polycyclic aromatic hydrocarbons (p-PAHs) or s
Bioaerosols are referred to as biological portions of aerosols including living microorganism (bacteria,fungi,and protozoa) and fragments,debris,and other derivatives from living organisms.In particul