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轴向负载
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  “轴向负载”译为未确定词的双语例句
     ② Model evaluation: The load of (500 N, 1 000 N, 1 500 N, 2 000 N, 2 500 N) axial compression were applied to the superior surface of the model in the form of a uniformly concentrated load over all L1 superior surface nodes respectively.
     ②模型评估: 在模型 L1 椎体的上表面分别施加 500,1 000,1 500,2 000,2 500 N 的轴向负载,观察有限元模型腰椎 L1~2 段的位移、应力、应变的分布变化情况;
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     In order to determine the universal and applicable parameter for the fatigue life estimation of spot-welding un-der various multi-axial loads,the nominal structural stress was shown by D.
     为了确定在各种多轴向负载情况下的点焊普遍适用的疲劳寿命评估参数,D.
  相似匹配句对
     Load Equalization Summary
     负载均衡综述
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     The Load Matching of Cablecasting
     有线广播的负载匹配
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     Axial Compression on Shuttles
     梭子的轴向压缩
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     In order to determine the universal and applicable parameter for the fatigue life estimation of spot-welding un-der various multi-axial loads,the nominal structural stress was shown by D.
     为了确定在各种多轴向负载情况下的点焊普遍适用的疲劳寿命评估参数,D.
     Axial Mixing in Packed Column
     填料塔内轴向混合
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  thrust load
Foreland subsidence and internal deformation of the orogenic wedge are strongly affected by two parameters of equal importance: the thrust load of the overthrusted microcontinents and the rigidity of the underthrusted Apulian passive margin.
      
The mean experimental results for thrust load lie within +10 percent of the theory when obtained from pressure distribution and within +20 percent when obtained from direct-force measurements.
      
A separate thrust structure was designed to take the 5,567 lb r thrust load and distribute it axially into the six longitudinal struts.
      
Any supports on the line must be examined to confirm their ability to withstand the pressure thrust load.
      
CAESAR II will apply the pressure thrust load on either end of an untied joint but this is only a good approximation.
      
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Since advent of three-column theory, brust fracture of the spinal column has long been recognized as the most common fracture of the thoracolumbar spine. Due to canal compromise by the retropulsed bony fragment, neuralgic defect was prevailed in this type of spinal injury. In the literature recently, new information being presented on the classification, concepts of stability and instability, need for surgery, and selection of the most appropriate surgical implant. Distraction force with kyphosis correction...

Since advent of three-column theory, brust fracture of the spinal column has long been recognized as the most common fracture of the thoracolumbar spine. Due to canal compromise by the retropulsed bony fragment, neuralgic defect was prevailed in this type of spinal injury. In the literature recently, new information being presented on the classification, concepts of stability and instability, need for surgery, and selection of the most appropriate surgical implant. Distraction force with kyphosis correction has been thought the most effective way in reducing the retropulsed fragment, either during the operation by variable implants or by traction device preoperatively, such as traction bow device. A number of biomechanical studies has been done on the isolated lumber spine under axial loads to determine the load distribution. Little study was performed on the whole spine under traction to determine the relative distribution of strain. The purpose of this study is to use the whole spine of goat under the axial load in INSTRON machine and Traction Bow to investigate the biomechanical properties such as train distribution, deformation of disc, and load- to-failure. Next, we try to reproduce a burst fracture model for further study in traction -reduction experiment. From the strain distribution diagram, the junction of thoracolumber spine bears the larger strain. The strain in the thoracic region is mediate, in contrast, the strain in lower lumbar is smaller in our experiment. The mean deformation of disc is 2.86mm, 5.09mm,6.45mm at the loading of 10kg, 20kg, 30kg reapective. The mean maximum loading of goat spine is 91.40kg in the load-to -failure test. In this study, strain distributions of spinal column observed by INSTRON machine and Traction bow are similar. However, the strain values from traction Bow is smaller. In conclusion, the junction of thoracolumbar spine is more effective in traction from its larger strain distribution. Hence, using the appropriate traction force in intact cervical vertebrae will have a better reduction effect to burst fracture of thoracolumbar vertebrae. The load -deformation disgram, total deformation, and maximum loading in this study will be helpful for related researches in the future.

胸腰椎的破裂骨折是一种党见的脊椎伤害,由于神经管常受到破裂骨块的压迫,常造成神经症状。牵引的力量加上后弯的矫正是目前被公认为手术或非手术方法治疗破裂骨折的重要原则。牵引的力量无论是在手术中应用内固定器或是在手术前应用脊椎牵引器就是希望藉着骨折复位进一步达到减压的可能性。过去的实验研究报告大多针对较少节数的腰椎施以轴向负载的生物刀学分析。很少实验对整条脊椎施以轴向负载并加以作生物刀学的量化分析。本实验的目的就是在以INSTRON材料试验机及脊椎牵引器探讨整条羊脊椎在外力牵引下的生物力学特性如应变分布、椎间盘变形量以及破坏负载。并试行制造破裂骨折以便进一步观察脊椎在牵引下的生物刀学特性实验结果我们由整条羊脊椎的应变分布图得知,在胸腰椎接合之区域有较大的应变值表示该区域局部所承受的力量较大,胸椎区域之应变值次之。而下腰椎区域之应变值则较小椎间盘总变形量在10kg时平均值为286mm,在20kg时为5.09mm,在30kg时为645mm。且羊脊椎在拉刀破坏试验时,平均最大负载为91.40kg。而在脊椎牵引器实验所得之应变分布与材料试验机实验所得之分布情形相近,但数值有较小之现象。由结果我们得到...

胸腰椎的破裂骨折是一种党见的脊椎伤害,由于神经管常受到破裂骨块的压迫,常造成神经症状。牵引的力量加上后弯的矫正是目前被公认为手术或非手术方法治疗破裂骨折的重要原则。牵引的力量无论是在手术中应用内固定器或是在手术前应用脊椎牵引器就是希望藉着骨折复位进一步达到减压的可能性。过去的实验研究报告大多针对较少节数的腰椎施以轴向负载的生物刀学分析。很少实验对整条脊椎施以轴向负载并加以作生物刀学的量化分析。本实验的目的就是在以INSTRON材料试验机及脊椎牵引器探讨整条羊脊椎在外力牵引下的生物力学特性如应变分布、椎间盘变形量以及破坏负载。并试行制造破裂骨折以便进一步观察脊椎在牵引下的生物刀学特性实验结果我们由整条羊脊椎的应变分布图得知,在胸腰椎接合之区域有较大的应变值表示该区域局部所承受的力量较大,胸椎区域之应变值次之。而下腰椎区域之应变值则较小椎间盘总变形量在10kg时平均值为286mm,在20kg时为5.09mm,在30kg时为645mm。且羊脊椎在拉刀破坏试验时,平均最大负载为91.40kg。而在脊椎牵引器实验所得之应变分布与材料试验机实验所得之分布情形相近,但数值有较小之现象。由结果我们得到在实验上脊柱承受牵引时,在胸腰椎接合之区域会承受较大的拉力,因

AIM:To evaluate the relationship between the shape of cavity and bond strength of the dentin. METHODS: Forty freshly extracted molars were ground flat to expose the dentin and randomly divided into two groups. The specimens were subjected to the tensile and shear bond tests. RESULTS: There were no significant differences of tensile bond strength of the dentin for the first group (P>0.5). On the other hand, there were significant differences of shear bond strengths of the dentin for the second group (P<0.00001).CONCLUSION:...

AIM:To evaluate the relationship between the shape of cavity and bond strength of the dentin. METHODS: Forty freshly extracted molars were ground flat to expose the dentin and randomly divided into two groups. The specimens were subjected to the tensile and shear bond tests. RESULTS: There were no significant differences of tensile bond strength of the dentin for the first group (P>0.5). On the other hand, there were significant differences of shear bond strengths of the dentin for the second group (P<0.00001).CONCLUSION: The shape of the cavity had a greater influence on the shear bond strength of the dentin than the tensile bond strength of the dentin.

目的研究盒型洞两侧的余留牙体组织与底面不同移行方式时抗剪切能力的关系。方法将新鲜离体牙的一部分制备成符合要求的两组试件。第一组试件的两侧壁轴向加载,第二组试件两侧壁侧向加载,分别记录两侧不同形状侧壁的抗剪切力值。结果轴向加载,不同形状的侧壁抗剪切力无显著性差异(P>0.5);侧向加载,不同形状的侧壁抗剪切力有高度显著性差异(P<0.00001)。结论两侧壁受到轴向负载时,其抗剪切能力与洞形无关,受侧向负载时,其抗剪切能力与洞形有密切关系。

BACKGROUND:Researches on vitodynamics present that percutaneous vertebroplasty (PVP) can strengthen hardness and intension of single osteoporosis vertebral body after injection of bone cement; however, the infused volume and site of bone cement for maintaining mechanical stability of vertebral body should be further studied. OBJECTIVE: A numerical calculation method on finite element models (FEM) for biomechanical analysis has been developed, while a boundary condition describing the relative L1-L2 displacement...

BACKGROUND:Researches on vitodynamics present that percutaneous vertebroplasty (PVP) can strengthen hardness and intension of single osteoporosis vertebral body after injection of bone cement; however, the infused volume and site of bone cement for maintaining mechanical stability of vertebral body should be further studied. OBJECTIVE: A numerical calculation method on finite element models (FEM) for biomechanical analysis has been developed, while a boundary condition describing the relative L1-L2 displacement is imposed on the FEM to account for three-dimensional physiological states. DESIGN: Non-randomized control study. SETTING: Beijing Neurosurgical Institute. MATERIALS: One female patient aged 54 years with compressibility fracture at lumbar vertebrae L1-L2 induced by osteoporosis was diagnosed with CT examination, and the patient was told the fact. Based on CT scanning before and after PVP, 90 serial sections with the thickness of 1 mm were obtained and the size of each pixel was 0.33 mm. METHODS: The experiment was carried out Beijing Neurosurgery Institute from October 2005 to June 2006. ①Establishment of three-dimensional FEM: Integrating the anatomical structure from the spine CT and MRI image of a patient, a novel three-dimensional geometric model of lumbar functional spinal units (FSUs) has been built. Meanwhile, 90 serial sections were obtained to exchange data of CT sections and divide imagings. Based on the geometric model, two kinds of three-dimensional FEM of L1-L2 segments for preoperative and postoperative vertebrae were created. ② Model evaluation: The load of (500 N, 1 000 N, 1 500 N, 2 000 N, 2 500 N) axial compression were applied to the superior surface of the model in the form of a uniformly concentrated load over all L1 superior surface nodes respectively. We could observe the stress distribution of L1-L2 segment by applying the load and clue on the high stress concentration region as the most likely areas fracture. MAIN OUTCOME MEASURES: ① Changes of displacement, stress and strain distributions of FEM at L1-L2 segment of lumbar vertebrae under various loads; ② Effect of increase of bone cement volume on displacement, stress and strain distribution. RESULTS: ① The increase in displacement, stress and strain of FE model with the increase of loading in the postoperative cases. The tendency was approximately linear which also illustrates the spine have flexible biomechanical characteristics. The region was a common place for injures due to loading. The magnitude of stress in the intervertebral disc depended on the proportion of load applied to the superior surface of the motion segment. The heavier the load was, the stronger the stress was. ② With the increase of stress on intervertebral disc, the increasing volume of bone cement could induce transfusion of load of nearby vertebral body. CONCLUSION: Building three-dimensional FEM of L1-L2 segments for preoperative and postoperative PVP can explain three-dimensional physiological status of vertebral body based on calculating relative shift of L1-L2 segment of lumbar vertebrae. Meanwhile, simulative calculation can clearly express distribution of stain and stress and preoperative and postoperative deformity of vertebral body.

背景: 生物力学研究表明椎体成形术在注入骨水泥后单个骨质疏松椎体的硬度和强度有很大的增长, 但对于保持椎体力学稳定性所需骨水泥的体积和其注入位置还有待进一步研究。目的: 通过参数有限元模型比较椎体成形手术腰椎 L1- L2 的生物力学稳定性评估椎体成形术的有效性。设计: 非随机对照观察。单位: 北京神经外科研究所。材料: 选择 1 例 54 岁女性骨质疏松性导致腰椎 L1- L2 压缩性骨折患者, 经 CT 确诊, 该患者对实验项目知情同意。通过椎体成形手术前后CT 扫描, 分别得到了各 90 张连续切片, 层厚 1 mm, 每个像素的尺寸是 0.33 mm。方法: 实验于 2005- 10/2006- 06 在北京神经外科研究所完成。①三维有限元模型的创建: 通过整合 CT 和 MRI 图像的解剖结构, 建立了一种腰椎功能性脊椎单元的三维几何模型, 基于该几何模型对搜集到 90 张连续 CT 切片数据进行转换并对图像进行分割, 创建两种分别表示患者通过椎体成形手术前后的 L1~2 段椎体三维有限元模型。②模型评估: 在模型 L1 椎体的上表面分别施加 500,1 000,1 500,2 000,2 500 ...

背景: 生物力学研究表明椎体成形术在注入骨水泥后单个骨质疏松椎体的硬度和强度有很大的增长, 但对于保持椎体力学稳定性所需骨水泥的体积和其注入位置还有待进一步研究。目的: 通过参数有限元模型比较椎体成形手术腰椎 L1- L2 的生物力学稳定性评估椎体成形术的有效性。设计: 非随机对照观察。单位: 北京神经外科研究所。材料: 选择 1 例 54 岁女性骨质疏松性导致腰椎 L1- L2 压缩性骨折患者, 经 CT 确诊, 该患者对实验项目知情同意。通过椎体成形手术前后CT 扫描, 分别得到了各 90 张连续切片, 层厚 1 mm, 每个像素的尺寸是 0.33 mm。方法: 实验于 2005- 10/2006- 06 在北京神经外科研究所完成。①三维有限元模型的创建: 通过整合 CT 和 MRI 图像的解剖结构, 建立了一种腰椎功能性脊椎单元的三维几何模型, 基于该几何模型对搜集到 90 张连续 CT 切片数据进行转换并对图像进行分割, 创建两种分别表示患者通过椎体成形手术前后的 L1~2 段椎体三维有限元模型。②模型评估: 在模型 L1 椎体的上表面分别施加 500,1 000,1 500,2 000,2 500 N 的轴向负载,观察有限元模型腰椎 L1~2 段的位移、应力、应变的分布变化情况; 观察骨水泥体积的增加对有限元椎体模型位移、应力、应变的分布的影响。主要观察指标: ①不同负载下有限元模型腰椎 L1~2 段的位移、应力、应变的分布变化情况。②骨水泥体积的增加对有限元椎体模型位移、应力、应变的分布的影响。结果: ①在轴向负载下 L1~2 段的应力应变随着负载的增大而增大, 在椎间盘的右侧部有很大的应力应变集中。而这一区域也是在负载情况下经常发生损伤的部位。在椎间盘上应力的大小取决于应用于椎体单元负载的大小。负载越大, 应力越大。②通过椎间盘上接触应力的增加, 随着骨水泥体积的增加导致了临近椎体的负载转移。结论: 建立了椎体成形手术前后 L1~2 段椎体三维有限元模型, 在有限元模型上计算腰椎 L1~2 相对位移可以说明椎体三维的生理状态。这一仿真计算也能清楚地显示椎体应力应变的分布和术前术后的变形。

 
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