The static buckling load of an imperfect circular cylindrical shell is here determined asymptotically with the assumption that the normal displacement can be expanded in a double Fourier series. The buckling modes con...The static buckling load of an imperfect circular cylindrical shell is here determined asymptotically with the assumption that the normal displacement can be expanded in a double Fourier series. The buckling modes considered are the ones that are partly in the shape of imperfection, and partly in the shape of some higher buckling mode. Simply-supported boundary conditions are considered and the maximum displacement and the static buckling load are evaluated nontrivially. The results show, among other things, that generally the static buckling load, λs decreases with increased imperfection and that the displacement in the shape of imperfection gives rise to the least static buckling load.展开更多
In order to give the reasonable width of seismic gaps to prevent the structural pounding during ground motions,the maximum relative displacement of adjacent structures is studied in this paper.The factors that may hav...In order to give the reasonable width of seismic gaps to prevent the structural pounding during ground motions,the maximum relative displacement of adjacent structures is studied in this paper.The factors that may have effects on the maximum relative displacement are discussed.As for multi-degree-of-freedom(MDOF) systems,they can be equivalent to single-degree-of-freedom(SDOF) systems with the influences of high modes neglected.The results show that the period ratio,height ratio and peak ground acceleration are the main factors that have great effects on the maximum relative displacement of adjacent structures.The maximum relative displacement of MDOF systems can be obtained from calculating the maximum relative displacement of the equivalent SDOF systems.展开更多
目的:通过Meta分析,比较手法复位联合咬合板治疗颞下颌关节盘不可复性前移位患者疼痛与最大张口度疗效是否优于仅进行手法或仅进行咬合板治疗。方法:计算机检索Web of Science、PubMed、Cochrane Library、维普(VIP)、中国知网(CNKI)、...目的:通过Meta分析,比较手法复位联合咬合板治疗颞下颌关节盘不可复性前移位患者疼痛与最大张口度疗效是否优于仅进行手法或仅进行咬合板治疗。方法:计算机检索Web of Science、PubMed、Cochrane Library、维普(VIP)、中国知网(CNKI)、万方中手法复位联合咬合板治疗颞下颌关节盘不可复性前移位的随机对照试验(RCTs)文献,并参考Cochrane手册评估文献质量,运用RevMan5.4软件分析结局指标。结果:本研究纳入6个RCTs,患者共计393例。Meta分析结果显示,对于颞下颌关节盘不可复性前移位患者,观察组进行手法复位联合咬合板治疗,在降低疼痛评分[SMD=-0.34,95%CI(-0.54,-0.13),P=0.001]与改善最大张口度[SMD=0.51,95%CI(0.31,0.71),P<0.00001]方面疗效均比对照组较优,差异具有统计学意义(P<0.05)。结论:手法复位联合咬合板治疗改善颞下颌关节盘不可复性前移位患者疼痛和最大张口度疗效优于单独使用手法复位或单独佩戴咬合板。展开更多
The amount of coseismic deformation and its distribution of the Wenchuan earthquake provide important scientific bases for revealing the mechanisms of earthquake preparation and characterizing the rupture propagation ...The amount of coseismic deformation and its distribution of the Wenchuan earthquake provide important scientific bases for revealing the mechanisms of earthquake preparation and characterizing the rupture propagation of the Wenchuan earthquake. The previous studies have indicated that the earthquake ruptured the middle-to-north segment of the Longmenshan central fault and the middle segment of the Longmenshan range-front fault, which are characterized by two surface rupture zones of 240 km and 90 km in length, respectively. Based on the pre-earthquake information and photos of landforms and buildings obtained through ge-ologic and geomorphic survey of the area around Shaba Village of Beichuan County, Sichuan Province and the extensive interview with local villagers, we measured the displacements of the major terrain features and the dislocated buildings by total station instruments and differential GPS and obtained the maximum vertical displacement of 9±0.5 m and right-lateral displacement of 2±0.5 m around the Zou’s house in Shaba Village. Though the near-surface deformation exhibits a normal faulting around Shaba Village, the dynamic environment has not changed on the whole. The NW wall of the fault uplifted but without gravity gliding as normally occurring on the hanging wall of a normal fault, which proves that the 9±0.5 m displacement should be the maximum coseismic vertical displacement of the May 12, 2008 Ms 8.0 Wenchuan earthquake.展开更多
可能最大降雨(Probable Maximum Precipitation,PMP)是评价核电厂防洪安全和排水系统设计的重要参数。在分析山东省某滨海核电厂厂址区域暴雨特性和天气成因的基础上,采用当地暴雨放大方法(水汽放大法和水汽效率放大法)和暴雨移置放大...可能最大降雨(Probable Maximum Precipitation,PMP)是评价核电厂防洪安全和排水系统设计的重要参数。在分析山东省某滨海核电厂厂址区域暴雨特性和天气成因的基础上,采用当地暴雨放大方法(水汽放大法和水汽效率放大法)和暴雨移置放大法推求出厂址24 h PMP。通过计算方案的合理性检查,对比山东省可能最大24 h点降雨量等值线图和其他核电厂工程24 h PMP成果,经综合分析确定该厂址24 h PMP为1100.0 mm,研究成果可为全国类似流域的PMP研究提供参考和借鉴。展开更多
The purpose of this paper is to present the rationale for registration of the Seated Condylar Position (SCP)/Centric Relation (CR) position of the condyles.
The purpose of this paper is to present the technique for registration of the Seated Condylar Position (SCP)/Centric Relation (CR) position of the condyles: a two-piece wax bite registration with deprogramming and no ...The purpose of this paper is to present the technique for registration of the Seated Condylar Position (SCP)/Centric Relation (CR) position of the condyles: a two-piece wax bite registration with deprogramming and no mandibular manipulation.展开更多
文摘The static buckling load of an imperfect circular cylindrical shell is here determined asymptotically with the assumption that the normal displacement can be expanded in a double Fourier series. The buckling modes considered are the ones that are partly in the shape of imperfection, and partly in the shape of some higher buckling mode. Simply-supported boundary conditions are considered and the maximum displacement and the static buckling load are evaluated nontrivially. The results show, among other things, that generally the static buckling load, λs decreases with increased imperfection and that the displacement in the shape of imperfection gives rise to the least static buckling load.
基金Supported by the State Key Program of National Natural Science Foundation of China (No. 50938008)the Fundamental Research Funds for Central Universities (No. 2012JBM077)
文摘In order to give the reasonable width of seismic gaps to prevent the structural pounding during ground motions,the maximum relative displacement of adjacent structures is studied in this paper.The factors that may have effects on the maximum relative displacement are discussed.As for multi-degree-of-freedom(MDOF) systems,they can be equivalent to single-degree-of-freedom(SDOF) systems with the influences of high modes neglected.The results show that the period ratio,height ratio and peak ground acceleration are the main factors that have great effects on the maximum relative displacement of adjacent structures.The maximum relative displacement of MDOF systems can be obtained from calculating the maximum relative displacement of the equivalent SDOF systems.
文摘目的:通过Meta分析,比较手法复位联合咬合板治疗颞下颌关节盘不可复性前移位患者疼痛与最大张口度疗效是否优于仅进行手法或仅进行咬合板治疗。方法:计算机检索Web of Science、PubMed、Cochrane Library、维普(VIP)、中国知网(CNKI)、万方中手法复位联合咬合板治疗颞下颌关节盘不可复性前移位的随机对照试验(RCTs)文献,并参考Cochrane手册评估文献质量,运用RevMan5.4软件分析结局指标。结果:本研究纳入6个RCTs,患者共计393例。Meta分析结果显示,对于颞下颌关节盘不可复性前移位患者,观察组进行手法复位联合咬合板治疗,在降低疼痛评分[SMD=-0.34,95%CI(-0.54,-0.13),P=0.001]与改善最大张口度[SMD=0.51,95%CI(0.31,0.71),P<0.00001]方面疗效均比对照组较优,差异具有统计学意义(P<0.05)。结论:手法复位联合咬合板治疗改善颞下颌关节盘不可复性前移位患者疼痛和最大张口度疗效优于单独使用手法复位或单独佩戴咬合板。
基金Supported by the National Natural Science Foundation of China (Grant No. 40841007)Scientific Investigation Project of the Ms 8.0 Wenchuan Earthquake of China Earthquake Administration
文摘The amount of coseismic deformation and its distribution of the Wenchuan earthquake provide important scientific bases for revealing the mechanisms of earthquake preparation and characterizing the rupture propagation of the Wenchuan earthquake. The previous studies have indicated that the earthquake ruptured the middle-to-north segment of the Longmenshan central fault and the middle segment of the Longmenshan range-front fault, which are characterized by two surface rupture zones of 240 km and 90 km in length, respectively. Based on the pre-earthquake information and photos of landforms and buildings obtained through ge-ologic and geomorphic survey of the area around Shaba Village of Beichuan County, Sichuan Province and the extensive interview with local villagers, we measured the displacements of the major terrain features and the dislocated buildings by total station instruments and differential GPS and obtained the maximum vertical displacement of 9±0.5 m and right-lateral displacement of 2±0.5 m around the Zou’s house in Shaba Village. Though the near-surface deformation exhibits a normal faulting around Shaba Village, the dynamic environment has not changed on the whole. The NW wall of the fault uplifted but without gravity gliding as normally occurring on the hanging wall of a normal fault, which proves that the 9±0.5 m displacement should be the maximum coseismic vertical displacement of the May 12, 2008 Ms 8.0 Wenchuan earthquake.
文摘可能最大降雨(Probable Maximum Precipitation,PMP)是评价核电厂防洪安全和排水系统设计的重要参数。在分析山东省某滨海核电厂厂址区域暴雨特性和天气成因的基础上,采用当地暴雨放大方法(水汽放大法和水汽效率放大法)和暴雨移置放大法推求出厂址24 h PMP。通过计算方案的合理性检查,对比山东省可能最大24 h点降雨量等值线图和其他核电厂工程24 h PMP成果,经综合分析确定该厂址24 h PMP为1100.0 mm,研究成果可为全国类似流域的PMP研究提供参考和借鉴。
文摘The purpose of this paper is to present the rationale for registration of the Seated Condylar Position (SCP)/Centric Relation (CR) position of the condyles.
文摘The purpose of this paper is to present the technique for registration of the Seated Condylar Position (SCP)/Centric Relation (CR) position of the condyles: a two-piece wax bite registration with deprogramming and no mandibular manipulation.
