搜索结果: 31-45 共查到“理学 Beijing”相关记录58条 . 查询时间(0.062 秒)
Source apportionment of fine organic aerosols in Beijing
Source apportionment fine organic aerosols Beijing
2009/11/19
Fine particles (PM2.5, i.e., particles with an aerodynamic diameter of ≤2.5 μm) were collected from the air in August 2005, August–September 2006, and January–February 2007, in Beijing, China. The che...
Use of a mobile laboratory to evaluate changes in on-road air pollutants during the Beijing 2008 Summer Olympics
on-road air pollutants Beijing 2008 Summer Olympics
2009/11/19
China implemented systematic air pollution control measures during the 2008 Beijing Summer Olympics and Paralympics to improve air quality. This study used a versatile mobile laboratory to conduct in ...
Observational study of influence of aerosol hygroscopic growth on scattering coefficient over rural area near Beijing mega-city
aerosol hygroscopic growth scattering coefficient Beijing mega-city
2009/10/13
We investigated aerosol hygroscopic growth property and its influence on scattering coefficient using M9003 nephelometers in coupling with humidity controlled inlet system at a rural site near Beijing...
Dust events in Beijing, China (2004–2006): comparison of ground-based measurements with columnar integrated observations
Dust events Beijing China columnar integrated observations
2009/9/23
Ambient particle number size distributions spanning three years were used to characterize the frequency and intensity of atmospheric dust events in the urban areas of Beijing, China in combination wit...
Hygroscopic growth of urban aerosol particles in Beijing (China) during wintertime: a comparison of three experimental methods
Hygroscopic growth urban aerosol particles experimental method
2009/9/23
The hygroscopic properties of atmospheric aerosols are highly relevant for the quantification of radiative effects in the atmosphere, but also of interest for the assessment of particle health effects...
Decoupling of Aerosol Absorption Coefficient in the Spring of 2006 at an Urban Site in Beijing
dust particle black carbon absorption coefficient wavelength exponent
2009/8/28
A statistic regression approach was used to estimate the wavelength exponents of black carbon (BC) and dust particles, and further to separate the contributions of the two types of aerosols to the tot...
Ozone air quality during the 2008 Beijing Olympics: effectiveness of emission restrictions
Ozone air quality 2008 Beijing Olympics effectiveness emission restrictions
2009/8/7
A series of aggressive measures was launched by the Chinese government to reduce pollutant emissions from Beijing and surrounding areas during the Olympic Games. Observations at Miyun, a rural site 10...
LASER2009’Beijing （第十九届全国激光学术会议通知）
第十九届 激光 会议通知
2009/5/31
第十九届全国激光学术会议主办单位：中国光学学会;中国电子学会。会议主题/征稿范围：1、激光物理(激光器动力学、激光等离子体物理、X光激光、激光光谱等)2、非线性光学与量子光学3、全固态激光器及新型激光器等。
One-year record of organic and elemental carbon in fine particles in downtown Beijing and Shanghai
organic elemental carbon fine particles Beijing Shanghai
2009/2/11
Weekly PM2.5 samples were collected for one year (1999-2000) in Beijing and Shanghai and the carbonaceous species analyzed to investigate and compare their time series patterns and possible sources in...
A modeling analysis of a heavy air pollution episode occurred in Beijing
modeling analysis heavy air pollution Beijing
2008/12/12
The concentrations of fine particulate matter (PM) and ozone in Beijing often exceed healthful levels in recent years, therefore China is to taking steps to improve Beijing's air quality for the 2008 ...
Variations of O3 and CO in summertime at a rural site near Beijing
O3 CO summertime rural site Beijing
2008/11/25
Large intra-season differences in mixing ratios of CO and O3 were detected at Miyun, a rural site north of Beijing, in summer 2006. Despite an increase in mean daytime mixing ratio of CO from 500 ppbv...
Relationships between submicrometer particulate air pollution and air mass history in Beijing, China, 2004–2006
submicrometer particulate air pollution air mass history Beijing China
2008/11/24
The Chinese capital Beijing is one of the global megacities where the effects of rapid economic growth have led to complex air pollution problems that are not well understood. In this study, ambient p...
Spatiotemporal variations of ambient PM10 source contributions in Beijing in 2004 using positive matrix factorization
spatiotemporal variations positive matrix factorization
2008/11/7
Source contributions to ambient PM10 (particles with an aerodynamic diameter of 10 μm or less) in Beijing, China were determined with positive matrix factorization (PMF) based on ambient PM10 composit...
Tropospheric ozone climatology over Beijing: analysis of aircraft data from the MOZAIC program
Tropospheric ozone climatology aircraft data MOZAIC program
2008/10/24
Ozone (O3) profiles recorded over Beijing from 1995 to 2005 by the Measurement of Ozone and Water Vapor by Airbus In-Service Aircraft (MOZAIC) program were analyzed to provide a first climatology of t...
Heavy dust fall in Beijing, on April 16-17, 2006: Geochemical properties and indications of the dust provenance
dust fall loess geochemical properties quartz oxygen isotope composition dust provenance
2017/8/10
A heavy dust fell in Beijing on April 16-17, 2006. The dust storm formed in middle and western Inner Mongolia, China, under a strong Mongolian Cyclone. During the dust fall, the near-surface wind spee...