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  toughness coefficient
The aim of the work consists in establishing a relation between the universally used mechanical properties determined in impact toughness tests and toughness parameters such asKt (toughness coefficient) andD2 (resistance to defects).
      


The low cycle fatigue properties of polycrystalline α-Fe before and after the implantation of Ag ̄+ ions by 90 keV and 6×10 ̄(16) ions/cm2 arestudied in this paper. Results thew that adn implantation improves the low cycle fatigue properties of α-Fe. The fatigue toughness factor and fatigue tongness index are increased from 0. 076 and 0. 32 before iniplantation to 0. 216and 0.42 respectively after implantation. Authors consider that, the major mechanism of improving the low cycle fatigue properties and increasing...

The low cycle fatigue properties of polycrystalline α-Fe before and after the implantation of Ag ̄+ ions by 90 keV and 6×10 ̄(16) ions/cm2 arestudied in this paper. Results thew that adn implantation improves the low cycle fatigue properties of α-Fe. The fatigue toughness factor and fatigue tongness index are increased from 0. 076 and 0. 32 before iniplantation to 0. 216and 0.42 respectively after implantation. Authors consider that, the major mechanism of improving the low cycle fatigue properties and increasing the fatigue toughnese is the hindrance by ion implantation to the cross-slips of helix. dislocation of body-centered cubic base. In addition, the strengthening of defects and the strengthening of solid solution aroused by implantatinn also affect the enhancement of low cycle fatigue properties to some extent.

本文研究了多晶α-Fe经90keV,6×10(16)ions/cm2银离子注入前后的低周疲劳性能,结果表明,离子注入改善了α-Fe的低周疲劳性能,疲劳韧性系数和疲劳韧性指数的绝对值分别从未注入时的0.076和0.32增加到0.216和0.42。作者认为,注入离子阻碍了体心立方基体螺位错的交滑移是疲劳韧性提高和低周疲劳性能改善的主要机制;另外,注入引起的缺陷强化和固溶强化对提高低周疲劳性能也有一定作用。

n experimental model of

用大白鼠复制骨软化性氟骨症动物模型,并通过饲料分别补加钙、维生素C、鱼肝油及酪蛋白四种成分,观察其对股骨生物力学的影响。实验结果表明,骨软化性氟骨症骨生物力学特性受到严重损害,韧性系数升高,弹性模量、刚度系数、断裂弯曲强度等下降(P<0.01)。补钙组的骨生物力学特性与常规食对照组相似,说明钙对骨软化性氟骨症骨机械性能改变具有一定的预防和改善作用。补维生素C及酪蛋白无作用,而补鱼肝油对部分动物有一定的作用,对部分无作用。

Objective:To assess the influence of exercise on bone mineral density and biomechanics in ovariectomized rats.Methods:Eight groups were established:①Normal Control group;②Osteoporosis model (OVX);③Combined Exercise and Calcium (Ex+Ca group);④Exercise1 group;⑤Exercise2 group;⑥Exercise Control Normal group (ExC);⑦Immobilization group(I);⑧Female Hormon group(H). BMD (Bone Mineral Density) and parameters of biomechanics were measured and analyzed.Results: BMD of ExC group was higher than that in nonexercise...

Objective:To assess the influence of exercise on bone mineral density and biomechanics in ovariectomized rats.Methods:Eight groups were established:①Normal Control group;②Osteoporosis model (OVX);③Combined Exercise and Calcium (Ex+Ca group);④Exercise1 group;⑤Exercise2 group;⑥Exercise Control Normal group (ExC);⑦Immobilization group(I);⑧Female Hormon group(H). BMD (Bone Mineral Density) and parameters of biomechanics were measured and analyzed.Results: BMD of ExC group was higher than that in nonexercise Normal Control group. BMD of the E+Ca Group and that of ExGroups were significantly higher than that in OVX group. BMD in Igroup was obviously lower than in all other groups. The result of biomechanic tests showed that: ① No significant difference was observed between all 4 groups related with exercise and Normal group in the biomechanic parameters.② No significant difference was showed among all 4 groups related with exercise in all parameters. ③ BMD in Hgroup was not statistically different from that of Normal group, but biomechanic test showed that Flexibility in Hgroup was worse than in Normal group. ④ There was significant difference between Igroup and all other groups in each parameter.Concludsion:Exercise showed independent effects on keeping bone mass and improving biomechanic nature during the growing stage and early or middle stage after ovarietomy.

目的:了解运动对切除卵巢大鼠骨密度(BMD)和生物力学改变的影响。方法:48只雌性大鼠随机分组:①正常对照组;②骨质疏松模型组;③运动和服钙联合组,④运动1组:去势后即予以运动;⑤运动2组:去势2月后才予以运动;⑥运动对照正常组;⑦制动组;⑧雌激素组。除①⑥组外,其余各组切除双侧卵巢。检测各组骨密度和生物力学有关指标。结果:运动正常组BMD高于非运动正常组;运动和钙联合组显著高于模型组。制动组BMD显著低于各实验组。生物力学实验显示:①运动各组的生物力学指标与正常组无显著性差异;②运动各组之间的各项指标无显著性差异;③激素组的BMD与正常组无显著差异,但生物力学试验显示韧性系数小;④运动组的各项指标与各运动实验组有显著性差异。结论:运动对大鼠生长期和去势后早期和中期骨密度的提高和生物力学性能的改善有作用

 
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