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相关概念视频

Non-ohmic Devices00:51

Non-ohmic Devices

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In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
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Types of Errors: Detection and Minimization01:12

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Error is the deviation of the obtained result from the true, expected value or the estimated central value. Errors are expressed in absolute or relative terms.
Absolute error in a measurement is the numerical difference from the true or central value. Relative error is the ratio between absolute error and the true or central value, expressed as a percentage.
Errors can be classified by source, magnitude, and sign. There are three types of errors: systematic, random, and gross.
Systematic or...
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Design Consideration

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Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key...
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Fatigue01:21

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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

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In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
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Fault Types01:18

Fault Types

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When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
For line-to-line faults occurring between phases B and C, the...
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相关实验视频

Updated: May 5, 2026

A New Murine Model of Endovascular Aortic Aneurysm Repair
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在EVAR之后的严重故障模式是特定于设备的.

O M Abdul-Malak1, P Cherfan1, N Liang1

  • 1Division of Vascular Surgery, University of Pittsburgh, Pittsburgh, PA, USA.

Journal of endovascular therapy : an official journal of the International Society of Endovascular Specialists
|May 11, 2024
PubMed
概括
此摘要是机器生成的。

内血管动脉瘤修复 (EVAR) 失败,如I型和III型内漏,需要重新干预. 了解设备特定的故障模式对于长期监测和成功的EVAR结果至关重要.

关键词:
埃瓦尔·埃瓦尔 (Evar Evar) 是一个人.动脉瘤是一个动脉瘤.这里是endoleakakak 的位置.

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科学领域:

  • 血管外科 血管外科
  • 血管内干预 血管内干预
  • 大动脉动脉瘤修复修复

背景情况:

  • 在内血管动脉瘤修复 (EVAR) 后的I型和III型内泄漏会导致严重的并发症,需要重新干预.
  • 不同的内移植器件在整个随访期间可能会呈现出不同的故障模式.

研究的目的:

  • 审查对1型和3型内脏泄漏以及各种器械的其他严重故障进行大动脉内脏移植再干预的机构经验.
  • 分析与不同EVAR设备相关的故障模式和结果.

主要方法:

  • 在2002年至2019年期间,对在EVAR后接受开放转换或主要内血管干预进行I/III型内泄症的患者进行了回顾性审查.
  • 收集了229名患者的基线特征,程序细节,再干预类型和结果.

主要成果:

  • 1A型内皮漏洞是再次干预的最常见迹象 (63.8%),其次是IB型 (20.1%),IIIA型 (16.6%) 和IIIB型 (6.5%).
  • 靠近的迁移是常见的AneuRx设备,类型III内泄与AFX设备,和类型IB内泄与Ancure设备.
  • 18%的患者呈现出破裂动脉瘤,9%的患者在重新干预时有症状.

结论:

  • 随着时间的推移,EVAR设备的严重故障模式会发生变化,需要对设备进行特定监控.
  • 了解遗留的内移植失败模式对于定制长期监测和修复策略至关重要.