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信号缺失
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  invalid and absent signal
     Rough set method for invalid and absent signal treatment in power station fault diagnosis system
     电站故障诊断系统中信号缺失处理的粗糙集方法
短句来源
  invalid and absent signals
     The rough set theory is an effective method to analyze and solve invalid and absent signals of diagnosis system since it can be applied to analyze the significance of the property of power plant fault diagnosis decision table and can be used to guide the diagnosis system to select the relevant input signals in the designing stage.
     采用粗糙集理论分析电站故障诊断决策表属性的重要性 ,在设计阶段用于指导诊断系统对相关输入信号的取舍 ,是分析解决诊断系统输入信号缺失问题的有效方法。
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  “信号缺失”译为未确定词的双语例句
     Microbleeds are defined on gradient-echo T2*-weighted images as one or more rounded signal loss lesions with a diameter of 2 to 5mm, without surrounding edema.
     在T2*加权梯度回波MRI图像上,微出血表现为一个或多个斑点状信号缺失灶,直径2~5mm,周围无水肿。
短句来源
     Conclusions Down-regulation of Smad2 and up-regulation of Smad7 contribute to relieve the inhibition effect mediated by TGF β of cellular proliferation,which results in losing of cell growth suppression mediated by TGF β and contribute to tumor development or progression.
     结论Smad2的表达下调及Smad7表达上调可能解除了TGF-β信号对细胞增殖的抑制作用,引起TGF-β的生长抑制信号缺失,使细胞生长失去控制,导致肿瘤的发生。
短句来源
     The most important was that wild BRD7 localized in nucleus, whereas NLS-deleted BRD7 shifted the nuclear localization to be mostly in cytoplasm.
     同时发现野生型BRD7呈胞核分布,而核定位信号缺失型BRD7主要呈胞浆分布。
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     After transplantation of labeled BMSCs via portal vein, livers had diffuse granular signal intensity appearance in T_2*WI MRI. Cells were detected for up to 2 w in receipts′ livers.
     经门静脉移植入正常大鼠肝脏后,T2序列扫描显示经标记的BMSCs在肝内显示弥漫性的结节性低信号影,移植后2h到2周均可见到细胞在受体肝脏内存在,组织学切片显示信号缺失部位与铁颗粒标记细胞相一致。
短句来源
     The missing degree of the local signal at the posterior lateral section of the root of the internal carotid artery on the 2D TOP MRA images was related to the furcate angle of the carotid artery branches,the bigger the angle was,the more the signal was missed.
     2D TOF MRA颈内动脉起始部后外侧局限性信号缺失程度与颈动脉分叉角度大小密切相关,分叉角度越大,其信号缺失越明显。
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  相似匹配句对
     New method to realize remote signal measure
     信号遥测方法
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     Signal transduction of ataxia-telangiectasia
     AT的信号传导
短句来源
     Up-regulation of Phosphatidylinositol-3 Kinase Signaling in plcg1 Gene Null Fibroblasts
     缺失plcg1基因引起成纤维细胞PI-3K信号上调
短句来源
     Rough set method for invalid and absent signal treatment in power station fault diagnosis system
     电站故障诊断系统中信号缺失处理的粗糙集方法
短句来源
     (3)Cilia absent;
     (3)纤毛缺失 ;
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Purpose:ToevaluateMRIinintraocularforeignbodiesascomparedwithCTaswelasconventionalX-rayfilms.Materialsandmethods:Therewere55intraocularforeignbodiesin42patients,33malesand9femalesagerangedfrom5~45years.Fifty-threeofthe55foreignbodieswerenon-magnetic,andtheremaining2wereferromagneticobjects.ConventionalX-rayfilms,CTandMRIexaminationswereaccomplishedwithinonemonth.Results:(1)Thepositiverateforshowing55intraocularforeignbodieswassimilaronMRI(94%)andCT(91%)(P>0.25),butmuchhigherthanconventionalX-rayfilms(42%)(P<0.005);(2)MRIwassuperiortoCTforthedemonstrationofeyecomplicationsrelatedtotheforeignbodies,butthecontrarywastruewhentheywerelocatedwithinthesclera;(3)T2WIandPDWIofSEsequencewerethemethodofchoiceforthedemonstrationoftheseforeignbodies;(4)non-magneticforeignbodiesusualyshowedsignallosswithoutartifactonMRI,whileferromagneticsubstancesproducedremarkableartifactandmightleadtoaccidentalinjuryoftheeye.Conclusion:MRIwasaneffectivemethodfortheevaluationofnon-magneticforeignbodiesoftheeye,especialyforthenon-metalicforeignbodiesundetectablewithCTorconventionalX-rayfilm.Itwasnotrecommendedforferromagneticforeignbodies....

Purpose:ToevaluateMRIinintraocularforeignbodiesascomparedwithCTaswelasconventionalX-rayfilms.Materialsandmethods:Therewere55intraocularforeignbodiesin42patients,33malesand9femalesagerangedfrom5~45years.Fifty-threeofthe55foreignbodieswerenon-magnetic,andtheremaining2wereferromagneticobjects.ConventionalX-rayfilms,CTandMRIexaminationswereaccomplishedwithinonemonth.Results:(1)Thepositiverateforshowing55intraocularforeignbodieswassimilaronMRI(94%)andCT(91%)(P>0.25),butmuchhigherthanconventionalX-rayfilms(42%)(P<0.005);(2)MRIwassuperiortoCTforthedemonstrationofeyecomplicationsrelatedtotheforeignbodies,butthecontrarywastruewhentheywerelocatedwithinthesclera;(3)T2WIandPDWIofSEsequencewerethemethodofchoiceforthedemonstrationoftheseforeignbodies;(4)non-magneticforeignbodiesusualyshowedsignallosswithoutartifactonMRI,whileferromagneticsubstancesproducedremarkableartifactandmightleadtoaccidentalinjuryoftheeye.Conclusion:MRIwasaneffectivemethodfortheevaluationofnon-magneticforeignbodiesoftheeye,especialyforthenon-metalicforeignbodiesundetectablewithCTorconventionalX-rayfilm.Itwasnotrecommendedforferromagneticforeignbodies.

目的:通过分析42例55枚眼内异物的MRI表现,并与CT和X线平片比较,探讨了MRI对眼内异物的诊断价值。材料与方法:男33例,女9例,年龄5~45岁。55枚眼内异物中非磁性异物53枚,铁磁性异物2枚。每例均在术前1个月内完成X线平片、CT和MRI检查。结果:(1)MRI对55枚眼内异物检出率(94%)和CT(91%)相仿(P>0.25),均明显高于X线平片(42%)(P<0.005);(2)MRI对眼内异物相关并发症的显示优于CT,而其对巩膜异物的显示差于CT;(3)SE序列T2WI和PDWI(质子密度加权成像)是检出眼内异物的优选序列;(4)非磁性异物MRI呈信号缺失区,无伪迹产生;而铁磁性异物产生大量伪迹,并可致眼部额外损伤。结论:MRI是检出眼内非磁性异物的有效方法,特别适用于X线平片和CT不能显示的少数非金属异物。眼内铁磁性异物不适于MRI。

The failed back surgery syndron(FBSS)is a diagnostic challenge to surgeons because its signs and symptoms are frequental nonspecific. CT and myelography can not provide enough in-formation on differentiation of recurrent disc herniation from epidural fibrotic scar. 32 cases with FBSS which had undergone reoperation were analyzed. MRI had been applied for all of them be-fore the second operation,and among them the diagnoses of 27 cases(84.4%)were found to be e-orrect as observed during the second operation,3...

The failed back surgery syndron(FBSS)is a diagnostic challenge to surgeons because its signs and symptoms are frequental nonspecific. CT and myelography can not provide enough in-formation on differentiation of recurrent disc herniation from epidural fibrotic scar. 32 cases with FBSS which had undergone reoperation were analyzed. MRI had been applied for all of them be-fore the second operation,and among them the diagnoses of 27 cases(84.4%)were found to be e-orrect as observed during the second operation,3 cases were found false-positive and 2cases could not be valued because of the artifact.The authors pointed out that MRI could provide adequate in-formation for differentiating epidural fibrotic scar and recurrent disc herniation. The authors also emphasized the importance of combination of MRI and clinical findings.

失败的下腰椎手术是个复杂的问题,由于其症状和体征不典型,单靠临床检查很难明确诊断,而脊髓造影和常规CT等检查也很难区别突出复发和硬膜外粘连。本文分析了32例再手术患者MRI图象,并与第二次手术所见对比,发现27例(84.4%)MRI诊断准确,3例假阳性,2例因信号缺失不能明确诊断。作者指出MRI能较清晰地显示突出复发和术后粘连。作者同时强调了MRI图象与临床表现相结合的重要性。

Purpose: To evaluate venous MR angiography in the diagnosis and followup of dural sinus thrombosis. Material and methods: Twelve patients were examined with venous MR angiography and spinecho MR imaging, 8 of them had conventional angiography. Venous MR angiographic findings were analysed and compared with MR imaging and conventional angiography. Results: Thrombosed dural sinuses and veins were included superior sagittal sinus 6 cases,torcular herophilia 8, transverse sinus 8(10 sinuses), sigmoid sinus 8(9),...

Purpose: To evaluate venous MR angiography in the diagnosis and followup of dural sinus thrombosis. Material and methods: Twelve patients were examined with venous MR angiography and spinecho MR imaging, 8 of them had conventional angiography. Venous MR angiographic findings were analysed and compared with MR imaging and conventional angiography. Results: Thrombosed dural sinuses and veins were included superior sagittal sinus 6 cases,torcular herophilia 8, transverse sinus 8(10 sinuses), sigmoid sinus 8(9), straight sinus 6, Galen vein 3 and internal cerebral vein 3(6). Direct signs of dural sinus thrombosis on MR angiogram included lack of typical high flow signal from a sinus that did not appear aplastic or hypoplastic and the frayed appearance of the flow signal from a sinus after recanalization. Indirect signs included evidence of formation of collaterials or visualization of emissary veins. Conclusion: Venous MR angiography is the imaging modality of choice in the diagnosis of dural sinus thrombosis. MR angiography provides more information than standard spinecho MRI, and unlike conventional angiography, it allows direct visualization of thrombotic material.

目的:探讨脑静脉磁共振血流成像在诊断脑静脉窦血栓中的应用价值。材料与方法:12例脑静脉窦患者均作MRI和脑静脉窦MRA检查(3例治疗后随诊),8例行静脉期脑血管造影;与常规SE图像和X线脑血管造影对照,着重分析脑静脉MRA在本病中的诊断价值。结果:受累的静脉窦有上矢状窦6例,窦汇(部分)8例,横窦8例(10个),乙状窦8例(9个),直窦6例,大脑大静脉3例和大脑内静脉3例(6个);脑静脉窦血栓MRA直接征象为发育正常的静脉窦高血流信号缺失或再通形成的边缘模糊且不规则的较低血流信号,间接征象有病变以远静脉侧支形成或其他途径引流静脉异常扩张。结论:脑静脉窦MRA及其原始图像在脑静脉窦血栓诊断及随诊中有独特价值,它比常规SE图像能提供更多的诊断信息,可直接显示静脉窦血栓,易于治疗后反复随诊,这些是血管造影所不及的。

 
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