2016年是泌尿外科医生值得纪念的年度,40年前,也就是1976年,世界上第一篇有关经皮肾手术的文章得以发表。经过40年的发展,经皮肾技术已十分完善,其有效性和安全性得到了泌尿外科医生的广泛认同,美国泌尿外科学会（American Urological A...2016年是泌尿外科医生值得纪念的年度,40年前,也就是1976年,世界上第一篇有关经皮肾手术的文章得以发表。经过40年的发展,经皮肾技术已十分完善,其有效性和安全性得到了泌尿外科医生的广泛认同,美国泌尿外科学会（American Urological Association,AUA）、欧洲泌尿外科学会（European Association Of Urology,EAU）和中国泌尿外科学会（Chinese Urological Association,CUA）均将其列为2cm以上肾结石的首选治疗方法.展开更多
By analyzing and comparing the existing methods for the division of urban economic region, this paper supplemented and developed the breaking point theory. In this model, put forward for the first time using ＂the spa...By analyzing and comparing the existing methods for the division of urban economic region, this paper supplemented and developed the breaking point theory. In this model, put forward for the first time using ＂the space-time distance＂ to replace ＂the space- linear distance＂ and ＂the city comprehensiveness quality- fuzzy comprehensive assessment Index＂ to ＂the urban population or GDP＇. Set up the algorithm of including ＂the space- time distance＂ and the city radiation scope changed with the changes of traffic conditions. Thus has realized ＂dynamically＂ tracing of the city radiation scope influenced by the traffic conditions. Taking Yichang city as an example, the paper analyzed the city function localization in the times of new traffic environments. Because China＇s cities are at the times of the traffic great changes, therefore, the method and the main conclusions of this paper have some methodology guiding sense to the majority cities of deffernt country to re-position.展开更多
A family of high_order accuracy explicit difference schemes for solving 2_dimension parabolic P.D.E. are constructed. Th e stability condition is r=Δt/Δx 2=Δt/Δy 2【1/2 and the truncation err or is O(Δt 3+Δx...A family of high_order accuracy explicit difference schemes for solving 2_dimension parabolic P.D.E. are constructed. Th e stability condition is r=Δt/Δx 2=Δt/Δy 2【1/2 and the truncation err or is O(Δt 3+Δx 4).展开更多
文摘2016年是泌尿外科医生值得纪念的年度,40年前,也就是1976年,世界上第一篇有关经皮肾手术的文章得以发表。经过40年的发展,经皮肾技术已十分完善,其有效性和安全性得到了泌尿外科医生的广泛认同,美国泌尿外科学会（American Urological Association,AUA）、欧洲泌尿外科学会（European Association Of Urology,EAU）和中国泌尿外科学会（Chinese Urological Association,CUA）均将其列为2cm以上肾结石的首选治疗方法.
文摘By analyzing and comparing the existing methods for the division of urban economic region, this paper supplemented and developed the breaking point theory. In this model, put forward for the first time using ＂the space-time distance＂ to replace ＂the space- linear distance＂ and ＂the city comprehensiveness quality- fuzzy comprehensive assessment Index＂ to ＂the urban population or GDP＇. Set up the algorithm of including ＂the space- time distance＂ and the city radiation scope changed with the changes of traffic conditions. Thus has realized ＂dynamically＂ tracing of the city radiation scope influenced by the traffic conditions. Taking Yichang city as an example, the paper analyzed the city function localization in the times of new traffic environments. Because China＇s cities are at the times of the traffic great changes, therefore, the method and the main conclusions of this paper have some methodology guiding sense to the majority cities of deffernt country to re-position.
文摘A family of high_order accuracy explicit difference schemes for solving 2_dimension parabolic P.D.E. are constructed. Th e stability condition is r=Δt/Δx 2=Δt/Δy 2【1/2 and the truncation err or is O(Δt 3+Δx 4).
