侧柏〔Platycladus orientalis L.)Franco〕在我国广泛分布,极耐干旱和瘠薄,适应性强,树形美观,材质优良。我省除东南部有天然分布外,作为荒山造林和园林绿化树种各地均有广泛栽培。笔者在天水市北道区发现侧柏三种主要害虫,于1988—199...侧柏〔Platycladus orientalis L.)Franco〕在我国广泛分布,极耐干旱和瘠薄,适应性强,树形美观,材质优良。我省除东南部有天然分布外,作为荒山造林和园林绿化树种各地均有广泛栽培。笔者在天水市北道区发现侧柏三种主要害虫,于1988—1990年进行了初步观察。展开更多
内容简介这里所叙述的波导是由介质板隔开的两条平行的导电板组成;波导的横截面呈字母 H 的形状。电介质板将能量传输集中在两条导电板间的电介质板附近,只有极小的一部分能量在波导的外面传输。选择适当的波导的尺寸,在某些范围内在波...内容简介这里所叙述的波导是由介质板隔开的两条平行的导电板组成;波导的横截面呈字母 H 的形状。电介质板将能量传输集中在两条导电板间的电介质板附近,只有极小的一部分能量在波导的外面传输。选择适当的波导的尺寸,在某些范围内在波导的横截面上可以得到我们所希望的能量流密度的分布。计算证明,在这种 H 形波导中衰减是极小的。展开更多
Objective：In order to achieve accurate implantation of the acetabular prosthesis in total hip arthroplasty（THA）,we designed individual templates based on a three-dimensional（3D） model generated from computed tomo...Objective：In order to achieve accurate implantation of the acetabular prosthesis in total hip arthroplasty（THA）,we designed individual templates based on a three-dimensional（3D） model generated from computed tomography（CT） scans.Methods：Individual templates were designed for 12 patients who underwent THA.A physical template was designed to conform to the contours of the patient＇s acetabulum and to confirm the rotation of the acetabular center.This guided the acetabular component orientation.Results：The preoperative and postoperative X-ray and CT scans were obtained to assess the location with respect to the accuracy of the acetabular component.For all patients,the abduction angle of the acetabular component was 46.7°to 54.3°and the anteversion angle was 11.3°to 18.5°Conclusions：The assessment of postoperative CT scans demonstrated higher accuracy of the acetabular component bore when used with the individual template.Therefore,the individual template can be an alternative to the computer-assisted navigation systems,with a good cost-performance ratio.展开更多
文摘内容简介这里所叙述的波导是由介质板隔开的两条平行的导电板组成;波导的横截面呈字母 H 的形状。电介质板将能量传输集中在两条导电板间的电介质板附近,只有极小的一部分能量在波导的外面传输。选择适当的波导的尺寸,在某些范围内在波导的横截面上可以得到我们所希望的能量流密度的分布。计算证明,在这种 H 形波导中衰减是极小的。
文摘Objective：In order to achieve accurate implantation of the acetabular prosthesis in total hip arthroplasty（THA）,we designed individual templates based on a three-dimensional（3D） model generated from computed tomography（CT） scans.Methods：Individual templates were designed for 12 patients who underwent THA.A physical template was designed to conform to the contours of the patient＇s acetabulum and to confirm the rotation of the acetabular center.This guided the acetabular component orientation.Results：The preoperative and postoperative X-ray and CT scans were obtained to assess the location with respect to the accuracy of the acetabular component.For all patients,the abduction angle of the acetabular component was 46.7°to 54.3°and the anteversion angle was 11.3°to 18.5°Conclusions：The assessment of postoperative CT scans demonstrated higher accuracy of the acetabular component bore when used with the individual template.Therefore,the individual template can be an alternative to the computer-assisted navigation systems,with a good cost-performance ratio.
