نتایج جستجو برای: gas cvd

تعداد نتایج: 261518  

Journal: :Diamond and Related Materials 2021

Multi-layered polycrystalline diamond (PCD) films were synthesized using microwave plasma-assisted chemical vapor deposition (CVD) with periodical addition (injections) of N 2 gas to the standard CH 4 -H mixture. The aim such an approach was reduce roughness while preserving overall high quality and phase purity PCD material. thicknesses in range 5 51 ?m, number layers from 1 15. introduction e...

متن کامل
پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی شریف 1369
بهمن زارع نژاد, داوود رشتچیان,

اکثر خطوط لوله انتقال gas-condensate در مناطق نفت خیز ایران، دارای قطر زیاد و تحت فشار بالا، درخارج از محدوده شرایط به کار رفته درایجاد مدل های دوفازی موجود می باشند. مدلهای فعلی، عموما براساس اطلاعات تجربی بدست آمده از لوله های کم قطر، در فشارهای پایین و تحت شرایط آزمایشی با مقدار مایع بیش از 10 ارائه گردیده اند. و به دلیل آنکه میزان مایع جمع شده در خطوط انتقال گاز و یا gas-condensate کمتر ازا...

2006
S. van Veldhuizen C. Vuik C. R. Kleijn

In this study various numerical schemes for simulating 2D laminar reacting gas flows, as typically found in Chemical Vapor Deposition (CVD) reactors, are proposed and compared. These systems are generally modeled by means of many stiffly coupled elementary gas phase reactions between a large number of reactants and intermediate species. The purpose of this study is to develop robust and efficie...

متن کامل
2004
Jing Chen Jae-Ouk Choo Raymond A. Adomaitis

The paper discussed the development of a simulator for the Programmable CVD Reactor system using the modular simulation approach. The design of the Programmable Reactor lends itself very naturally to a modular approach because of the segmented showerhead design while each segment is a fairly complex component, with individually controllable reactant gas supply and residual gas exhaust, the desi...

متن کامل
ژورنال: مجله علوم پزشکی رازی 2004
سهراب, گلبن, آزادبخت, لیلا, عزیزی, فریدون, اسماعیل‌زاده, احمد , میرمیران, پروین ,

Cardiovascular disease(CVD) is still a health and a social problem in our country. Major risk factors have been identified for CVD in different studies. Other surveys have mentioned some dietary and non-dietary factors related to these risk factors. The aim of this study was to determine the predictors of CVD risk factors in distinct 13 of Tehran. Dietary intake assessment was underta...

متن کامل
Journal: :Environmental Health Perspectives 1997
J Fawell D Robinson R Bull L Birnbaum G Boorman B Butterworth P Daniel H Galal-Gorchev F Hauchman P Julkunen C Klaassen S Krasner J Orme-Zavaleta J Reif R Tardiff

Background: The basis for ethnic differences in cardiovascular disease (CVD) susceptibility is not fully understood. We investigated patterns of population differentiation (FST) of a set of genes in etiologic pathways of CVD among 3 ethnic groups: Yoruba in Nigeria (YRI), Utah residents with European ancestry (CEU), and Han Chinese (CHB) + Japanese (JPT). We identified 37 pathways implicated in...

متن کامل
Journal: :Inorganics (Basel) 2022

A concentration series of Y3Al5O12:Ce solid solutions were prepared, and the composition demonstrating highest X-ray luminescence intensity cerium was identified. Based on best composition, a luminescent diamond–Y3Al5O12:Ce composite films synthesized using microwave plasma-assisted chemical vapor deposition (CVD) in methane–hydrogen gas mixtures. Variations amounts embedded powders allowed for...

متن کامل
1999
J.-H. Boo S.-B. Lee S.-J. Ku W. Koh C. Kim K.-S. Yu Y. Kim

We have deposited the MgAl2O4 thin ®lms on Si(1 0 0) substrates in the temperature range of 270 6008C using newly developed single molecular precursors of Mg[(m-OBu)2AlMe2]2 and Mg[Al(O Bu)4]2 by MOCVD. Polycrystalline, crack-free stoichiometric MgAl2O4 thin ®lms were successfully grown on at as low as 4008C. This growth temperature was much lower than that of conventional CVD, and this is the ...

متن کامل
2008
Jason L. Johnson Yongho Choi

The authors experimentally demonstrate a simple and efficient approach for nucleating the catalytic chemical vapor deposition CVD growth of GaN nanowires, Ga2O3 nanowires, and Ga2O3 nanoribbons by using ion implantation of Fe+ into thermally grown SiO2 layers and subsequent annealing to form the catalyst nanoparticles. This work shows that ion implantation can be used as a versatile method to c...

متن کامل
1999
Mark T. Swihart Steven L. Girshick

Measurement of the chemical composition of gases sampled through a small hole in the substrate can be a useful diagnostic for investigations of the chemistry of chemical vapor deposition ~CVD! processes. Ideally, one would measure the composition of the gas at the growth surface. However, the flow disturbance due to sampling causes the conditions at the mouth of the orifice to be different from...

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"; } -->