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损伤强化
相关语句
  damage hardening
     The evolution of damage is determined by damage hardening condition, failure occurs when the hardening of damage reaches its critical value.
     损伤演变由损伤强化条件决定,当损伤强化达到临界值时,混凝土发生破坏。
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  相似匹配句对
     Strengthening and Detriment during Surface Rolling for Low Carbon Steel
     低碳钢在滚压过程中的强化损伤
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     A NEW CALCULATING METHOD FOR CONVERTING LIVES ACCORDING TO EQUAL DAMAGE ON STRENGTHENING LOADING SPECTRA
     载荷谱强化损伤寿命折算新方法
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     Duodenal injuries
     十二指肠损伤
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     insist nicety;
     强化准确;
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     Strengthening the Base of Persond Training and Nurturing Qualified Talents
     强化育人根本
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In this paper an anisotropic damage model is developed based on the principle of energy equivalence. The evolution of damage is determined by damage hardening condition, failure occurs when the hardening of damage reaches its critical value. The unilateral behaviour of concrete can be described appropriately by the proposed model.

在能量等价假设的基础上建立了混凝土的各向异性损伤本构方程。损伤演变由损伤强化条件决定,当损伤强化达到临界值时,混凝土发生破坏。本模型能较好地描述混凝土的单侧受力性能。

Objective To evaluate the correlation between the irradiation dose and superparamagnetic iron oxide (SPIO) enhanced MR imaging of the irradiated liver. Methods 25 rabbits were separated randomly into 5 groups. 3 days after focal irradiation (0, 10, 20, 30 and 40Gy), MR imaging was performed before and after SPIO injection with TSE-T 2W sequence, and the number of Kupffer cell containing SPIO particles was counted. The characteristics of MR enhancement were evaluated according to the pathological findings.Results...

Objective To evaluate the correlation between the irradiation dose and superparamagnetic iron oxide (SPIO) enhanced MR imaging of the irradiated liver. Methods 25 rabbits were separated randomly into 5 groups. 3 days after focal irradiation (0, 10, 20, 30 and 40Gy), MR imaging was performed before and after SPIO injection with TSE-T 2W sequence, and the number of Kupffer cell containing SPIO particles was counted. The characteristics of MR enhancement were evaluated according to the pathological findings.Results The liver injury induced by no less than 30Gy irradiation can be detected by SPIO-enhanced T 2 weighted imaging (P<0.05). The irradiated portion of the liver was visualized with a demarcation from the non-irradiated part as a decrease in negative enhancement. Significant regression was observed as a dose-related change of the enhancement rate in the irradiated portion on SPIO-enhanced T 2-weighted images (P<0.05) and of the number of Kupffer cell containing SPIO particles (P<0.05). Conclusion MRI SPIO-enhanced T 2-weighted imaging was reliable for detecting the range and extent of liver injury 3 days after irradiation.

目的 探讨MRITSE -T2 WI菲立磁增强扫描对超急性期放射性肝损伤的诊断与评估价值。方法  2 5只家兔随机分成 5组。除对照组外 ,其余 4组分别给予 10、2 0、3 0、40Gy单次X线半肝照射。照射后第 3天对肝区行MRITSE -T2 WI平扫及菲立磁增强扫描。分析辐照后肝组织损伤的强化特征 ,并进行组织学检查对照分析。结果 T2 WI菲立磁增强扫描在照射后第 3天能确切检出的放射性肝损伤的最小照射剂量为 3 0Gy(Ρ <0 .0 5 ) ,表现为受照区肝组织信号强度较非受照区高 ,两者间可见分界线。受照区肝组织菲立磁增强程度 (ER)的绝对值与照射剂量成正相关 (Ρ <0 .0 5 )。所有家兔受照区肝组织在光镜下未见明确组织水肿、纤维化及炎症细胞浸润等病理征象 ,但其单位视野面积内含有SPIO颗粒的Kupffer细胞数在≥ 2 0Gy组明显低于非受照区 (Ρ <0 .0 5 ) ,且与照射剂量成负相关 (Ρ <0 .0 5 )。结论 T2 WI菲立磁增强扫描不仅能早期发现 (照射后第 3天 )、明确诊断超急性期放射性肝损伤 ,还可通过测量肝组织ER对损伤程度进行估测。

Objective:To observe the enhanced MRI findings and evaluate its diagnostic value for radiation-induced temporal lobe injury in nasopharyngeal carcinoma.Methods:Thirty-six patients with diagnosis of radiation-induced temporal lobe injury were retrospectively reviewed. All patients were diagnosed by clinical manifestations and MR imaging. The disease was divided into white matter type and gray matter type by the sites and MR appearances of radiation-induced injury, and the white matter type included white matter...

Objective:To observe the enhanced MRI findings and evaluate its diagnostic value for radiation-induced temporal lobe injury in nasopharyngeal carcinoma.Methods:Thirty-six patients with diagnosis of radiation-induced temporal lobe injury were retrospectively reviewed. All patients were diagnosed by clinical manifestations and MR imaging. The disease was divided into white matter type and gray matter type by the sites and MR appearances of radiation-induced injury, and the white matter type included white matter phase Ⅰ and white matter phase Ⅱ.Results:Of the 36 patients with radiation-induced temporal lobe injury in the series, 27 were defined as white matter type and 9 were defined as gray matter type. And the white matter type of 27 cases included white matter phase Ⅰ in 18 cases and white matter phase Ⅱ in 9 cases. The pattern of enhancement in the white matter phase Ⅰ were of blotch or patch on the bottom of temporal lobes, and the most enhancements were located in the inferomedial portions of the temporal lobes (mainly gray matter). The lesion showing a ring-enhancement pattern were common in the white matter phase Ⅱ (56%), and the other pattern of enhancement mainly showed irregularly solid enhancement around the radiation-induced necrosis or on the bottom of temporal lobes. In the gray matter type, the pattern of enhancement were characterized by blotchy or nodular solid enhancement in the gray matter lesions.Conclusion:The contrast-enhanced MRI finds are characteristic in radiation-induced injury following radiotherapy for nasopharyngeal carcinoma. It has important value and clinical significance for enhanced MR scanning to find the early signs and establish diagnosis for radiation-induced injury,and the enhanced MR scanning should be performed as the routine.

目的:探讨鼻咽癌放疗后颞叶放射性脑损伤的MR增强扫描表现特点及诊断价值。方法:回顾性分析36例鼻咽癌放疗后颞叶放射性脑损伤患者的临床及MR影像资料。按病变的主要发病部位及MR表现将其分为灰质型及白质型,其中白质型进一步分为白质型Ⅰ期和白质型Ⅱ期。结果:36例放射性脑损伤包括27例白质型及9例灰质型,其中27例白质型包括白质型Ⅰ期18例、白质型Ⅱ期9例。白质型Ⅰ期病例中增强扫描均表现为颞叶底部灰质内为主团块状或散在的斑点状、斑片状实质强化,强化区多位于颞叶底部内侧灰质及颞极区灰质;白质型Ⅱ期病例增强扫描主要表现为花环状强化,占强化病灶的56%,其它主要表现为坏死灶周边及颞叶底部灰质内不规则实质强化。灰质型病例中增强扫描表现为病变区斑点状或结节状强化。结论:鼻咽癌放疗后颞叶放射性脑损伤的强化部位、强化形状及强化范围均具有一定的特征性,增强扫描在放射性脑损伤的诊断及早期征象的发现中有重要价值,应作为常规扫描进行。

 
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