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Acoustic improvement on two lecture auditoria： Simulation and experiment

Frontiers of Architectural Research 2017年第1期6卷 1-16页

作者： Soha Eldakdoky ahmed elkhateeb Department of Architecture Faculty of Engineering Helwan University Egypt Department of Architecture Faculty of Engineering Ain Shams University Egypt

Based on the commonly used indicators for speech intelligibility, this work acoustically evaluates the two largest auditoria in the Faculty of Engineering, Helwan University, Cairo, Egypt, using experimental and digital simulation techniques. Design treatments were also suggested to improve the acoustic performance of the auditoria, where the impact of these treatments was checked using the simutation as well. The models that were analysed using the CATT-software were first validated utilizing the results of the fietd work in the unoccupied rooms. The results showed that the acoustic quality of the two auditoria are far from the optimal conditions due to their improper acoustic characteristics and the high noise revers as weft. The results of improvement proposals showed that altering the ceiling shape and adding efficient absorptive materials to the rear surfaces successfully reduced the excessive reverberation time to the optimal values, increased the earty reflections and eliminated the shadow zones. In addition, decreasing the noise Levels by 20 dB due to improving the window insulation noticeably improved the speech intelligibitity at all receivers.

关键词： Acoustic performance Speech intelligibility Reverberation time Background noise lever Lecture auditoria

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Noise levels inside the coaches of Greater Cairo tunnel metro, line 3 tunnel

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Frontiers of Architectural Research 2021年第2期10卷 410-419页

作者： Soha Eldakdoky ahmed elkhateeb Department of Architecture Faculty of EnsineeringHelwan UniversityCairoEgypt Department of Architecture Faculty of EngineeringAin Shams UniversityCairoEgypt

This paper investigates the noise inside a metro coach running through the most recent tunnel of Cairo.The study focuses on the effects of alignment profiles on the A-weighted noise level.Although the latest line has not been studied yet,noise levels inside the old lines attracted the attention of researchers due to their importance as the first mass transit system in Africa.Given that windows are usually kept open,measurements were conducted inside the empty cabin at the end of the train with open windows according to ISO 3381:2005.Results showed that noise emissions inside the running coaches are high and do not follow either international or general national legislation,which presents health hazards for drivers and commuters.Speech intelligibility is required for train radio units and driver consoles for voice communications,which provides a safe working environment for the train crew.The present study reveals that tight curves mainly contribute to high noise.The noise levels are further raised by the reflective surface of the tunnel with a circular cross-section and the unballasted track.Moreover,the noise level is affected by the location of the coach and window conditions(open/close)to some extent.

关键词： Interior noise Line 3 tunnel Equivalent noise Slope gradient Noise exposure Unballasted slab track

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Walking experience:Exploring the trilateral interrelation of walkability,temporal perception,and urban ambiance

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Frontiers of Architectural Research 2021年第3期10卷 516-539页

作者： Doaa K.Hassan ahmed elkhateeb Department of Architecture Faculty of EngineeringAin Shams UniversityCairoEgypt

Walking experience through urban spaces is a frequent daily activity.Thus,planning and designing for walkability become crucial for building up quality of life.Our daily walks around the city are affected by fulfilling the needed psychological contentment that is in turn measured unconsciously by our temporal perception.This contentment is inherent in what we experience in accordance with urban ambiance that goes beyond the spatial attributes of spaces to include their social and sensorial dimensions.Thus,the question here is how walkability of urban routes is affected by urban ambiance and therefore perceived in terms of time.Therefore,this study aims to understate the trilateral interrelation of walkability,temporal perception,and urban ambiance in walkable routes for daily routine use.This work depends on an experimental study where participants are asked to walk along two selected routes.Data-gathering tools rely on documenting the lived experience of the target group via reporting their trips and answering a questionnaire.Pattern analysis demonstrates this trilateral interrelation to clarify the interplay.This study concludes specific qualities of walkable routes for routine use that reduce sense of time,which is highly crucial to be realized in such daily walk journeys.

关键词： Walkability Urban ambiance Temporal perception People’s needs in open spaces

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Inter-ethnic marriages and severity of coronary artery disease:A multicenter study of Arabian Gulf States

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World Journal of Cardiology 2017年第4期9卷 371-377页

作者： Amin Daoulah Salem Al-kaabi Amir Lotfi Mushabab Al-Murayeh S Ali Nasseri Waleed ahmed Salah N Al-Otaibi Mohamed N Alama Osama E elkhateeb Amy J Plotkin Majed M Malak Khalid Alshali Mohamed Hamzi Saleh Al Khunein Mohammed Abufayyah Alawi A Alsheikh-Ali Cardiovascular Department King Faisal Specialist Hospital and Research Center Cardiology Department Zayed Military Hospital Division of Cardiology Baystate Medical CenterTufts University School of Medicine Cardiovascular Department Armed Forces Hospital Southern Region Politecnico di Torino Internal Medicine Department King Faisal Specialist Hospital and Research Center Cardiac Anesthesiology King Faisal Specialist Hospital AND Research Center Cardiology Department King Abdul Aziz University Hospital Cardiology Department King Abdullah Medical City in Holy Capital Department of Pathology Johns Hopkin University Internal Medicine Department King Abdul Aziz University Hospital Anesthesia Department Prince Sultan Military Medical City College of Medicine Mohammed Bin Rashid University of Medicine and Health Sciences Institute of Cardiac Sciences Sheikh Khalifa Medical City

AIM To assess the association of inter-ethnic vs intra-ethnic marriage with severity of coronary artery disease(CAD) in men undergoing angiography.METHODS We conducted a prospective multicenter,multi-ethnic,cross sectional observational study at five hospitals in Saudi Arabia and the United Arab Emirates,in which we used logistic regression analysis with and without adjustment for baseline differences. RESULTS Data were collected for 1068 enrolled patients undergoing coronary angiography for clinical indications during the period of April 1^(st),2013 to March 30^(th),2014. Ethnicities of spouses were available only for male patients. Of those enrolled,687 were married men and constituted the cohort for the present analysis. Intra-ethnic marriages were reported in 70% and inter-ethnic marriages in 30%. After adjusting for baseline differences,interethnic marriage was associated with lower odds of having significant CAD [adjusted odds ratio 0.52(95%CI:0.33,0.81)] or multi-vessel disease(MVD) [adjusted odds ratio 0.57(95%CI:0.37,0.86)]. The adjusted association with left main disease showed a similar trend,but was not statistically significant [adjusted odds ratio 0.74(95%CI:0.41,1.32)]. The association between interethnic marriage and the presence of significant CAD and MVD was not modified by number of concurrent wives(P interaction > 0.05 for both).CONCLUSION Among married men undergoing coronary angiography,inter-ethnic,as compared to intra-ethnic,marriage is associated with lower odds of significant CAD and MVD.

关键词：阿拉伯的海湾内部种族的婚姻冠的动脉疾病心脏的传染病学冠的 angiography

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