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GaN载流子浓度和迁移率的光谱研究 被引量:7
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作者 李志锋 陆卫 +4 位作者 叶红娟 袁先璋 沈学础 G.Li S.j.chua 《物理学报》 SCIE EI CAS CSCD 北大核心 2000年第8期1614-1619,共6页
用红外反射光谱的方法对生长在蓝宝石衬底上的α GaN外延薄膜的载流子浓度和迁移率进行了研究 .通过测量蓝宝石衬底和不同Si掺杂浓度的一系列GaN外延膜的远红外反射谱并进行理论计算和拟合 ,得到GaN中的声子振动参量和等离子振荡的频率... 用红外反射光谱的方法对生长在蓝宝石衬底上的α GaN外延薄膜的载流子浓度和迁移率进行了研究 .通过测量蓝宝石衬底和不同Si掺杂浓度的一系列GaN外延膜的远红外反射谱并进行理论计算和拟合 ,得到GaN中的声子振动参量和等离子振荡的频率及阻尼常量 ,并由此计算得到其载流子浓度和迁移率 .计算结果 ,红外方法得到的载流子浓度与Hall测量相一致 ,但迁移率比Hall迁移率要低约二分之一 .同时红外谱与喇曼谱上明显观察到LO声子与等离子体激元耦合模 ,(LPP) 展开更多
关键词 外延薄膜 载流子浓度 迁移率 氧化镓 光谱
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An epidemiological report on the burden and trend of injuries in the Philippines from 2011 to 2018
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作者 Imee T.Macaranas Kin Israel R.Notarte +3 位作者 Abbygail Therese M.Ver Adriel M.Pastrana Franchesca j.chua Derick Erl P.Sumalapao 《Journal of Acute Disease》 2020年第5期200-205,共6页
Objective:To describe the epidemiological distribution of injury cases in the Philippines from 2011 to 2018.Methods:A retrospective review of records from the Online National Electronic Injury Surveillance System invo... Objective:To describe the epidemiological distribution of injury cases in the Philippines from 2011 to 2018.Methods:A retrospective review of records from the Online National Electronic Injury Surveillance System involving trauma cases was done,and data were collated,tabulated,and statistically analyzed.Results:A total of 668?179 injury cases were recorded,and 68.99%of these cases involved males.Vulnerable individuals belonged to the group aged 15-29 years(34.01%).The most populated regions in the country,the National Capital Region(14.90%)and RegionⅣA(13.96%),incurred the highest number of recorded cases.Traffic crash(32.67%)was reported to be the major cause of injury;and open wounds(37.56%)and abrasion(26.23%)were found to be the most common types of injury.Conclusions:The burden of injury remains high in the Philippines due to the lack of resources and inadequate healthcare.The findings of the present study on the distribution of injury cases provide useful information for taking appropriate preventive measures,developing effective safety guidelines,allocating limited resources in an appropriate manner,and implementing necessary public health programs. 展开更多
关键词 Traffic crash TRAUMA Surveillance system
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Augmented anastomotic urethroplasty with buccal mucosa for post penile fracture urethral injury long segment bulbar urethral stricture review
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作者 Shreya Srivastava Alexandra L.Tabakin +6 位作者 Kevin j.chua Hiren V.Patel joshua Sterling Charles F.Polotti Arnav Srivastava jeremy C.Sinkin Hari S.G.R.Tunuguntla 《Asian Journal of Urology》 CSCD 2021年第3期337-339,共3页
Dear editor,The national incidence of penile fracture in the United States is estimated as 1.02 per 100000 males[1].Nine to twenty percent of these injuries result in a concomitant urethral injury[2,3].Barros et al.[4... Dear editor,The national incidence of penile fracture in the United States is estimated as 1.02 per 100000 males[1].Nine to twenty percent of these injuries result in a concomitant urethral injury[2,3].Barros et al.[4]reported that 85 out of 888 penile fractures men with penile fractures had concomitant urethral injuries[4].Among those with both a penile fracture and urethral injury,only two cases of urethral stricture were reported.Furthermore,only three percent of urethral strictures resulted from penile fractures[5].These data highlight the relatively low incidence of urethral stricture in patients with penile fracture and concomitant urethral injury. 展开更多
关键词 URETHRAL INJURIES STRICTURE
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