نتایج جستجو برای: no2

تعداد نتایج: 6921  

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد شاهرود - دانشکده فنی 1391
آرمین سعادتی, سید محمود موسوی, مجید مهدویان,

ماده ای در هوا مانند no2 که می تواند برای انسان و محیط زیست مضر باشد به عنوان آلاینده هوا شناخته می شود. no2 یکی از یک گروه از گازهای بسیار واکنش پذیر تحت عنوان اکسید های نیتروژن (nox ) است. در تحقیق حاضر مدلسازی و شبیه سازی جذب گاز no2 از مخلوط -n2 no2 با استفاده از یک تماس دهنده غشایی الیاف تو خالی مورد مطالعه قرار گرفته است. یک مدل ریاضی دو بعدی برای شبیه سازی رفتار جذب no2 توسط آب به عنوان ...

15 صفحه اول
2012
Silvia Vilčeková

Nitrogen monoxide (NO) and nitrogen dioxide (NO2) are gases produced by hightemperature combustion through reactions between nitrogen and oxygen. Both nitrogen in fuel and nitrogen in the air can participate in the reactions. Formation of NO can be followed by further oxidation into NO2 in the atmosphere. NO2 is the most toxic of the nitrogen oxides (grouped generically as NOx) and it is very i...

متن کامل
Journal: :Nihon eiseigaku zasshi. Japanese journal of hygiene 1989
M Shima M Adachi

In order to clarify the role of nitrogen dioxide (NO2) in the development of lung injury, male Wistar rats were exposed continuously to 0.3 or 5.0 ppm NO2 for 10, 20, 30, 60 and 90 days, and alveolar macrophages and lavage fluid obtained by bronchoalveolar lavage were examined. The results were as follows: 1) The number of alveolar macrophages increased significantly in response to NO2 exposure...

متن کامل
Journal: Iranian Journal of Toxicology 2009
Sara Mousazadeh,

Background: nitrogen oxides occur in the atmosphere in Six forms of namely: N2O , NO , NO2 , N2O3, N2O4 and N2O5 .Among these oxides NO2 is the most important air pollutant because of its relatively high toxicity and its ubiquity in ambient air. In this research Griess-Saltzman method was utilized for determination of nitric oxide and nitrogen dioxide in the atmosphere of different laboratori...

متن کامل
Journal: :environmental health engineering and management 0
yusef omidi department of environmental health engineering, school of health, lorestan university of medical sciences, khorramabad, iran gholamreza goudarzi environmental technologies research center, ahvaz jundishapur university of medical sciences, ahvaz, iran ali mirza heidari department of environmental health engineering, school of public health, ahvaz jundishapur university of medical sciences, ahvaz, iran seyed mohammad daryanoosh department of environmental health engineering, school of health, lorestan university of medical sciences, khorramabad, iran

background: epidemiological studies have illustrated that exposure to atmospheric nitrogen oxides (no2/nox) is responsible for an increased risk of acute or chronic diseases such as cancer. in this study the health risks associated with nitrogen dioxide (no2) were assessed in the city of kermanshah, the capital of kermanshah province, iran. methods: data on hourly no2 levels that had been measu...

متن کامل
2014
Meng Wang Rob Beelen Tom Bellander Matthias Birk Giulia Cesaroni Marta Cirach Josef Cyrys Kees de Hoogh Christophe Declercq Konstantina Dimakopoulou Marloes Eeftens Kirsten T. Eriksen Francesco Forastiere Claudia Galassi Georgios Grivas Joachim Heinrich Barbara Hoffmann Alex Ineichen Michal Korek Timo Lanki Sarah Lindley Lars Modig Anna Mölter Per Nafstad Mark J. Nieuwenhuijsen Wenche Nystad David Olsson Ole Raaschou-Nielsen Martina Ragettli Andrea Ranzi Morgane Stempfelet Dorothea Sugiri Ming-Yi Tsai Orsolya Udvardy Mihaly J. Varró Danielle Vienneau Gudrun Weinmayr Kathrin Wolf Tarja Yli-Tuomi Gerard Hoek Bert Brunekreef

BACKGROUND Land use regression (LUR) models have been developed mostly to explain intraurban variations in air pollution based on often small local monitoring campaigns. Transferability of LUR models from city to city has been investigated, but little is known about the performance of models based on large numbers of monitoring sites covering a large area. OBJECTIVES We aimed to develop Europ...

متن کامل
Journal: :The European respiratory journal 1995
P J Barth B Müller U Wagner A Bittinger

Nitrogen dioxide (NO2), the oxidation product of nitric oxide (NO), is a reactive free radical forming gas, the inhalation of which has been reported to induce severe damage to distal airways. In order to quantify dose and time course of parenchymal and vascular damage, rats were exposed to 5, 10 and 20 ppm NO2 for 3 and 25 days, followed by quantitative histology and morphometry of the lung. H...

متن کامل
2006
K. F. Boersma H. J. Eskes E. J. Bucsela

We present a new algorithm for the near-real time retrieval – within 3 h of the actual satellite measurement – of tropospheric NO2 columns from the Ozone Monitoring Instrument (OMI). The retrieval is based on the combined retrieval-assimilation-modelling approach developed at KNMI for off-line tropospheric NO2 from the GOME and SCIAMACHY satellite instruments. We have adapted the off-line syste...

متن کامل
2004
R. V. Martin D. D. Parrish T. B. Ryerson D. K. Nicks K. Chance T. P. Kurosu D. J. Jacob E. D. Sturges A. Fried B. P. Wert

[1] We compare tropospheric measurements of nitrogen dioxide (NO2) and formaldehyde (HCHO) from the Global Ozone Monitoring Experiment (GOME) satellite instrument with in situ measurements over eastern Texas and the southeast United States. On average, the GOME and in situ measurements of tropospheric NO2 and HCHO columns are consistent despite pronounced sampling differences. The geometric mea...

متن کامل
2007
Cheng F. Lee Jen H. Hsiao Shin J. Cheng Huey H. Hsieh

This study aims to classify regions with different air pollution characteristics into groups in Taiwan, and further to evaluate and compare the air quality of various groups. A selected multivariate analysis technique, cluster analysis, is applied to the pollution monitoring dataset which including PM10, SO2, NO2, CO and O3. The obtained results have proved that the regions with similar air pol...

متن کامل

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید

function paginate(evt) { url=/search_year_filter/ var term=document.getElementById("search_meta_data").dataset.term pg=parseInt(evt.target.text) var data={ "year":filter_year, "term":term, "pgn":pg } filtered_res=post_and_fetch(data,url) window.scrollTo(0,0); } function update_search_meta(search_meta) { meta_place=document.getElementById("search_meta_data") term=search_meta.term active_pgn=search_meta.pgn num_res=search_meta.num_res num_pages=search_meta.num_pages year=search_meta.year meta_place.dataset.term=term meta_place.dataset.page=active_pgn meta_place.dataset.num_res=num_res meta_place.dataset.num_pages=num_pages meta_place.dataset.year=year document.getElementById("num_result_place").innerHTML=num_res if (year !== "unfilter"){ document.getElementById("year_filter_label").style="display:inline;" document.getElementById("year_filter_place").innerHTML=year }else { document.getElementById("year_filter_label").style="display:none;" document.getElementById("year_filter_place").innerHTML="" } } function update_pagination() { search_meta_place=document.getElementById('search_meta_data') num_pages=search_meta_place.dataset.num_pages; active_pgn=parseInt(search_meta_place.dataset.page); document.getElementById("pgn-ul").innerHTML=""; pgn_html=""; for (i = 1; i <= num_pages; i++){ if (i===active_pgn){ actv="active" }else {actv=""} pgn_li="
  • " +i+ "
    • "; pgn_html+=pgn_li; } document.getElementById("pgn-ul").innerHTML=pgn_html var pgn_links = document.querySelectorAll('.mypgn'); pgn_links.forEach(function(pgn_link) { pgn_link.addEventListener('click', paginate) }) } function post_and_fetch(data,url) { showLoading() xhr = new XMLHttpRequest(); xhr.open('POST', url, true); xhr.setRequestHeader('Content-Type', 'application/json; charset=UTF-8'); xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { var resp = xhr.responseText; resp_json=JSON.parse(resp) resp_place = document.getElementById("search_result_div") resp_place.innerHTML = resp_json['results'] search_meta = resp_json['meta'] update_search_meta(search_meta) update_pagination() hideLoading() } }; xhr.send(JSON.stringify(data)); } function unfilter() { url=/search_year_filter/ var term=document.getElementById("search_meta_data").dataset.term var data={ "year":"unfilter", "term":term, "pgn":1 } filtered_res=post_and_fetch(data,url) } function deactivate_all_bars(){ var yrchart = document.querySelectorAll('.ct-bar'); yrchart.forEach(function(bar) { bar.dataset.active = false bar.style = "stroke:#71a3c5;" }) } year_chart.on("created", function() { var yrchart = document.querySelectorAll('.ct-bar'); yrchart.forEach(function(check) { check.addEventListener('click', checkIndex); }) }); function checkIndex(event) { var yrchart = document.querySelectorAll('.ct-bar'); var year_bar = event.target if (year_bar.dataset.active == "true") { unfilter_res = unfilter() year_bar.dataset.active = false year_bar.style = "stroke:#1d2b3699;" } else { deactivate_all_bars() year_bar.dataset.active = true year_bar.style = "stroke:#e56f6f;" filter_year = chart_data['labels'][Array.from(yrchart).indexOf(year_bar)] url=/search_year_filter/ var term=document.getElementById("search_meta_data").dataset.term var data={ "year":filter_year, "term":term, "pgn":1 } filtered_res=post_and_fetch(data,url) } } function showLoading() { document.getElementById("loading").style.display = "block"; setTimeout(hideLoading, 10000); // 10 seconds } function hideLoading() { document.getElementById("loading").style.display = "none"; } -->