عنوان فارسی مقاله:
هزینه و اثربخشی عایق حرارتی سیستم های سقف سبز: مطالعه تجربی در هنگ کنگ
عنوان انگلیسی مقاله:
Thermal insulation and cost effectiveness of green-roof systems: An empirical study in Hong Kong
سال انتشار : 2016
عنوان فارسی مقاله:
طراحی مجموعه سنسور برای ذخیره انرژی در ساختمان
عنوان انگلیسی مقاله:
Designing sensor sets for capturing energy events in buildings
سال انتشار : 2016
عنوان فارسی مقاله:
اثر نانوصفحات اکسید گرافن بر روی خواص ژئوتکنیکی خاک سیلت سیمانی
عنوان انگلیسی مقاله:
Effect of graphene oxide nanosheets on the geotechnical properties of cemented silty soil
سال انتشار : 2016
عنوان فارسی مقاله:
سیستم نظارت ساختاری زنجیره راه آهن بی سیم: مقیاس کامل مطالعه موردی
عنوان انگلیسی مقاله:
A wireless railway catenary structural monitoring system: Full-scale case study
سال انتشار : 2016
عنوان فارسی مقاله:
ارزیابی فرسودگی قابلیت اطمینان پیری پل خرپا راه آهن: معقول بودن رویکرد احتمالاتی زندگی استرسی
عنوان انگلیسی مقاله:
Fatigue reliability assessment of ageing railway truss bridges: Rationality of probabilistic stress-life approach
سال انتشار : 2016
عنوان فارسی مقاله:
ارزیابی آسفالت تغییر از خالی از هوا بتن آسفالتی از طریق داده آرایه آنتن GPR
عنوان انگلیسی مقاله:
Evaluating asphalt concrete air void variation via GPR antenna array data
سال انتشار : 2015
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مقدمه انگلیسی مقاله:
1. Introduction
The focus of this case study is nondestructive evaluation of air void content in newly constructed asphalt pavement. Airvoid content deviation from the specified range is a major factor in early pavement deterioration [1–3]. Many road ownersspecify destructively cutting cores in the pavement to determine density at randomly chosen locations, such as the currentMinnesota Department of Transportation (MnDOT) specifications [4]. This process is expensive, destructive, labor consuming,and does not provide immediate feedback to the construction inspector or the contractor. Further, cores only represent asmall portion of the total paved surface [4].Ground penetrating radar (GPR) has been used for many construction material related applications [5–7]. This includesasphalt layer thickness determination if the approximate dielectric constant is known [1,8]. Use of air coupled GPR for detectingasphalt pavement air void content variation has been proposed as a nondestructive alternative to cores [1–3,9]. This
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کلمات کلیدی:
[PDF]Assessmentofairvoid contentofasphaltusing ... - Aaltodochttps://aaltodoc.aalto.fi/bitstream/handle/123456789/.../isbn9789526062884.pdf?...1by T Pellinen - 2015 - Related articles... air void content of asphalt using dielectric constant ... pavement condition for both old and new asphalt pavements. The objective is to ... GPR inadvertently reduces observed density variations and may introduce a systematic bias. This makes ... Keywords asphalt, air voids, GPR, permittivity, calibration, dielectric constant.Assessment of air void content of asphalt using dielectric constant ...https://aaltodoc.aalto.fi/handle/123456789/17140Translate this pageby T Pellinen - 2015 - Related articlesAir void content is an important quality measure of pavement condition for ... for the GPR inadvertently reduces observed density variations and may introduce a ...Ground Penetrating Radar Theory and Applicationshttps://books.google.com/books?isbn=0080951848Harry M. Jol - 2008 - Science(2000) have tested stepped frequency radar using 0.5–6.0 GHz air-coupled waves to detect ... In many cases, concrete pavements have asphalt overlay, and in ... also has great variation in the transverse direction of the road, the accuracy of GPR ... GPR quality control applications include measuring the air voids content of ...Using Infrared and High-speed Ground-penetrating Radar for ...https://books.google.com/books?isbn=0309129346Stephen Sebesta, Thomas Scullion, Timo Saarenketo - 2013 - AsphaltThe variation in timecalibration factor is as shown below: C1_C2 ... PANK 4122: Air void content of asphalt pavement, groundpenetrating radar. tf S 0.7 ns 0 ...Civil Engineering Applications of Ground Penetrating Radarhttps://books.google.com/books?isbn=3319048139Andrea Benedetto, Lara Pajewski - 2015 - ScienceGPR is particularly sensitive to moisture, so a GPR system can pick up areas of ... on laboratory slab testing and field testing is that GPR can identify variations in the pavement, isolate the depth of a discontinuity in the pavement, and provide a ... to estimate air void content of asphalt surfaces and to detect mix segregation.
عنوان فارسی مقاله:
سرعت بحرانی اصلاح شده برای مدیریت دود آتش سوزی تونل جاده با پیکربندی استخراج دود اختصاصی
عنوان انگلیسی مقاله:
A modified critical velocity for road tunnel fire smoke management with dedicated smoke extraction configuration
سال انتشار : 2014
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مقدمه انگلیسی مقاله:
1. Introduction
Tunnel accidents involving a fire incident is a low frequency event. However, its consequence is serious if the fireemergency system is not properly designed and managed to cope with this special event.One of the design objectives of a tunnel fire life safety system based on smoke extraction is to maintain tenable conditionsin the tunnel and to contain the smoke within a manageable segment of the tunnel, allowing the occupants to be evacuatedthrough the exits or egress passages before developing fire hazards make the tunnel untenable.When a fire incident happens in a longitudinally ventilated tunnel, two zones will be developed. One is the tunnelzone in the upstream traffic location relative to the fire incident, the other is the downstream traffic location relativeto the fire location. In most cases, the downstream zone is of less concern because vehicles can continue to drive awayat a higher speed than that of the smoke flows, if there is no traffic congestion in the downstream zone. The local smokeextraction system can also help keep a tenable condition in the downstream section of the tunnel beyond the local firezone, which means there is less of a concern even if there is traffic congestion in the downstream. However, theupstream zone is the major concern because traffic will build up behind the fire because of the fire incident. Severalpublications have discussed smoke control to maintain tenable conditions upstream of the fire location[1–9]. However,the impact of smoke extraction and spray water fire suppression on the required critical velocity has not been includedin their investigations.In newly built road tunnels, local smoke exhaust systems with a dedicated smoke duct is gaining popularity because oftheir effectiveness in mitigating fire hazards developing in the tunnel. For example, the renovated Mont Blanc Tunnelbetween France and Italy, the Clem 7 tunnel and the Airport Link road tunnel in Brisbane Australia, and the Alaskan WayViaduct replacement tunnel in Seattle have adopted the concept of a dedicated smoke exhaust duct to ensure the smokein close proximity to fire incident can be extracted. Tunnel emergency ventilation system design to mitigate fire hazards nor-mally utilizes air flow momentum to effect smoke control with longitudinal flows that establish critical velocity as recom-mended in NFPA502 for vehicular tunnels[10]. However, this flow capacity does not take into account of the local smokeextraction effects.In some tunnels in the US, Japan and Australia, a sprinkler or deluge systems are being utilized to actively control the firespread and protect the tunnel structure. Gas cooling of the hot upper smoke layer is achieved through heat convection, masstransport and evaporative cooling effects as a result of sprinkler spray field created by overhead fixed fire suppression systemoperation. Unlike tunnels with longitudinal ventilation, when the smoke exhaust and water based sprinkler fire suppressionsystem are operating, this required critical velocity to protect the upstream zone can be reduced when the smoke extractionis enhanced with optimized local damper operation configuration to effectively limit the spread of smoke and untenable con-ditions within a local tunnel segment.This paper discusses a modified critical velocity for road tunnels, where a dedicated smoke extraction system and waterbased fire suppression system is provided. This modified critical velocity and the extraction rate will be determined througha performance based approach considering the specific tunnel ventilation and fire safety provisions of the tunnel. Severalcritical fire scenarios which should be considered have been highlighted. Two different tunnel gradients have also been ana-lyzed in this paper, and a methodology has been proposed on how to determine the modified critical velocity and the smokeexhaust capacity.Design parameters such as fire scenarios, fire sizes, tunnel gradient, fire location, smoke extraction location and totalnumber of open smoke extraction dampers are also analyzed to confirm the performance of this modified critical velocitywith an evaluation of system robustness of operating modes and configuration
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کلمات کلیدی:
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عنوان فارسی مقاله:
تراکم آتش سوزی انرژی بار برای طراحی مبتنی بر خطر ساختمان پارکینگ
عنوان انگلیسی مقاله:
Fire load energy densities for risk-based design of car parking buildings
سال انتشار : 2015
عنوان فارسی مقاله:
مقاومت در برابر آتش سوزی ساختمانی: بیانیه خام سیستم امتیاز، طراحی ناسازگار
عنوان انگلیسی مقاله:
Structural fire resistance: Rating system manifests crude, inconsistent design
سال انتشار : 2015
عنوان فارسی مقاله:
کابینه روشنایی اضطراری برای یادگیری ایمنی آتش سوزی
عنوان انگلیسی مقاله:
Emergency lighting cabinet for fire safety learning
سال انتشار : 2015
