نتایج جستجو برای: particle size distributions

تعداد نتایج: 809634  

2016
Long Ma Jinglu Wu Jilili Abuduwaili

Particle size analysis of lacustrine core sediments and atmospheric natural dust were conducted in the drainage area of Ebinur Lake in arid northwest China. Using a combination of (137)Cs and (210)Pb dating, a continuous record of aeolian transportation to the lake sediments and related factors over about the past 150 years was analyzed. Factor analysis revealed the particle-size distributions ...

2016
Gergely Csibra Mikołaj Hernik Olivier Mascaro Denis Tatone Máté Lengyel

Looking times (LTs) are frequently measured in empirical research on infant cognition. We analyzed the statistical distribution of LTs across participants to develop recommendations for their treatment in infancy research. Our analyses focused on a common within-subject experimental design, in which longer looking to novel or unexpected stimuli is predicted. We analyzed data from 2 sources: an ...

2009
Elham Soheilipour Sanam Kheirieh Majid Madani Alireza Akbarzadeh Baghban Saeed Asgary

INTRODUCTION Particle size and distribution can influence the properties of materials. This study analyzed and compared the particle size of Root MTA, calcium hydroxide (CH), and a new endodontic cement called calcium enriched material (CEM). MATERIALS AND METHODS The particle size of each material was analyzed three times using 0.05 mg of test material with a particle size analyzer. The part...

2015
Andrew J. Heymsfield Paul R. Field Matt Bailey Dave Rogers Jeffrey Stith Cynthia Twohy Zhien Wang Samuel Haimov JEFFREY STITH CYNTHIA TWOHY ZHIEN WANG SAMUEL HAIMOV

Lenticular wave clouds are used as a natural laboratory to estimate the linear and mass growth rates of ice particles at temperatures from 2208 to 2328C and to characterize the apparent rate of ice nucleation at water saturation at a nearly constant temperature. Data are acquired from 139 liquid cloud penetrations flown approximately along or against the wind direction. A mean linear ice growth...

2007
anne hirsikko taina Yli-Juuti tuomo nieminen eija vartiainen lauri laakso tareq hussein markku Kulmala

We measured air ion size distributions with an air ion spectrometer in the size range of 0.34–40.3 nm both indoors (in July) and outdoors (in August) in Helsinki, Finland in 2004. At the same time we measured particle number concentrations and size distributions with two condensation particle counters (indoors) and differential mobility particle sizer (outdoors). Our main focus was to study new...

2015
Zhien Wang Andrew J. Heymsfield Paul R. Field Matt Bailey Dave Rogers Jeffrey Stith Cynthia Twohy Samuel Haimov ANDREW J. HEYMSFIELD JEFFREY STITH CYNTHIA TWOHY ZHIEN WANG SAMUEL HAIMOV

Lenticular wave clouds are used as a natural laboratory to estimate the linear and mass growth rates of ice particles at temperatures from 2208 to 2328C and to characterize the apparent rate of ice nucleation at water saturation at a nearly constant temperature. Data are acquired from 139 liquid cloud penetrations flown approximately along or against the wind direction. A mean linear ice growth...

2013
Yue Cheng Chang-jin Hu Yan-bo Gai Xue-jun Gu Wei-xiong Zhao Wei Huang Wei-jun Zhang

Indoor smog chamber experiments have been conducted to investigate the dynamics of secondary organic aerosol (SOA) formation from OH-initiated photo-oxidation of isoprene in the presence of organic seed aerosol. The dependence of the size distributions of SOA on both the level of pre-existing particles generated in situ from the photo-oxidation of trace hydrocarbons of indoor atmosphere and the...

Journal: :The Analyst 2016
Fan Cao Fabrizio Donnarumma Kermit K Murray

The concentration and size distribution were measured for particles ablated from tissue sections using an infrared optical parametric oscillator laser system. A scanning mobility particle sizer and light scattering particle sizer were used in parallel to realize a particle sizing range from 10 nm to 20 μm. Tissue sections from rat brain and lung ranging in thickness between 10 and 50 μm were mo...

2008
M. Krudysz C. Sioutas

Ultrafine particle (UFP) number concentrations vary significantly on small spatial and temporal scales due to their short atmospheric lifetimes and multiplicity of sources. To determine UFP exposure gradients within a community, simultaneous particle number concentration measurements at a network of sites are necessary. Concurrent par-5 ticle size distribution measurements aid in identifying UF...

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