نتایج جستجو برای: ultrafine

تعداد نتایج: 4276  

Journal: :Environmental Health Perspectives 2001
M Brauer C Avila-Casado T I Fortoul S Vedal B Stevens A Churg

Epidemiologic evidence associates particulate air pollution with cardiopulmonary morbidity and mortality. The biological mechanisms underlying these associations and the relationship between ambient levels and retained particles in the lung remain uncertain. We examined the parenchymal particle content of 11 autopsy lungs from never-smoking female residents of Mexico City, a region with high am...

2016
Tianhao Zhang Zhongmin Zhu Wei Gong Hao Xiang Ying Li Zhenzhen Cui

Ultrafine particles with a diameter below 1 μm are strongly linked to traffic and industrial emissions, causing a growing global health concern. In order to reveal the characteristics of ultrafine particles in central China, which makes up the sparse research in industrial cities of a developing country, particle number concentrations (PNC) together with meteorological parameters and concentrat...

Journal: :Inhalation toxicology 2006
E D Kuempel C L Tran V Castranova A J Bailer

Risk assessment of occupational exposure to nanomaterials is needed. Human data are limited, but quantitative data are available from rodent studies. To use these data in risk assessment, a scientifically reasonable approach for extrapolating the rodent data to humans is required. One approach is allometric adjustment for species differences in the relationship between airborne exposure and int...

Journal: :American journal of physiology. Lung cellular and molecular physiology 2006
Ulrich Sydlik Katrin Bierhals Maria Soufi Josef Abel Roel P F Schins Klaus Unfried

Apoptosis and proliferation are important causes of adverse health effects induced by inhaled ultrafine particles. The molecular mechanisms of particle cell interactions mediating these end points are therefore a major topic of current particle toxicology and molecular preventive medicine. Initial studies revealed that ultrafine particles induce apoptosis and proliferation in parallel in rat lu...

Journal: :The international journal of occupational and environmental medicine 2012
N K Kalappanavar C S Vinodkumar C Gouli D Sanjay K Nagendra K G Basavarajappa R Patil

BACKGROUND It has been shown that inhalation of carbonaceous particulate matter may impair lung function in children. OBJECTIVE Using the carbon content of airway macrophages as a marker of individual exposure to particulate matter derived from fossil fuel, we sought direct evidence for this association. METHODS 300 children from puffed rice industrial areas and 300 children from population...

Journal: :Journal of environmental sciences 2012
Cheng Huang Diming Lou Zhiyuan Hu Piqiang Tan Di Yao Wei Hu Peng Li Jin Ren Changhong Chen

This study investigated the emission characteristics of ultrafine particles based on test bench and on-board measurements. The bench test results showed the ultrafine particle number concentration of the diesel engine to be in the range of (0.56-8.35) x 10(8) cm(-3). The on-board measurement results illustrated that the ultrafine particles were strongly correlated with changes in real-world dri...

2014
Eric Jackson Lisa Aultman - Hall Britt Holmén

Made possible by the collection of on-board tailpipe emissions data, this research identifies road and driver factors that are associated with a relatively understudied tailpipe pollutant from lightduty vehicles: ultrafine particle number emissions. High emission events (HEE) of ultrafine particle number (PN) emissions occurred most frequently at locations with steep upgrades or locations that ...

Journal: :Chemical communications 2006
A Lebugle F Pellé C Charvillat I Rousselot J Y Chane-Ching

Ultrafine individualised mono crystalline Ca(10-x)(PO4)(6-x)(HPO4)x(OH)(2-x) deficient calcium hydroxyapatite nanocrystals displaying fluorescence under visible excitation are proposed for utilisation as biocompatible biological probes.

Journal: :international journal of iron & steel society of iran 2015
m. golzar shahri m. salehi s. r. hosseini

the mechanical properties and microstructural developments of 321 stainless steel during thermomechanicalprocess were investigated. the repetitive cold rolling and subsequent annealing wereconducted to achieve nanocrystalline structure in an aisi 321 stainless steel. heavily cold rolling at−20°c was conducted to form martensite in metastable austenitic steel. the process was followed byannealin...

2017
Vitaliy E. Danilhenko

Data about an effect of cyclic γ-α-γ martensitic transformations on the structure state of reverted austenite Fe-31.7 wt.% Ni-0.06 wt.% C alloy are presented. The effect of multiple direct γ-α and reverse α-γ martensitic transformations on fragmentation of austenitic grains has been investigated by electron microscopy and X-ray diffraction methods. An ultrafine structure has been formed by nano...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید