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相关概念视频

Leaky Scanning02:28

Leaky Scanning

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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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In biological systems, most metabolic pathways are interconnected. The cellular respiration processes that convert glucose to ATP—such as glycolysis, pyruvate oxidation, and the citric acid cycle—tie into those that break down other organic compounds. As a result, various foods—from apples to cheese to guacamole—end up as ATP. In addition to carbohydrates, food also contains proteins and lipids—such as cholesterol and fats. All of these organic compounds are used...
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Speed of a Transverse Wave01:13

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The speed of a wave depends on the characteristics of the medium. For example, in the case of a guitar, the strings vibrate to produce the sound. The speed of the waves on the strings and the wavelength determine the frequency of the sound produced. The strings on a guitar have different thicknesses but may be made of similar material. They have different linear densities, and the linear density is defined as the mass per length.
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The speed of sound in a gaseous medium depends on various factors. Since gases constitute molecules that are free to move, they are highly compressible. Hence, sound waves travel slowly through gases. Thermodynamics helps us understand the relationship between pressure, volume, and temperature of gases, thus, the speed of sound in an ideal gas can be determined using the laws of thermodynamics. At the same time, Newton's laws of motion and the continuity equation of fluid dynamics also come...
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The motion of molecules in a gas is random in magnitude and direction for individual molecules, but a gas of many molecules has a predictable distribution of molecular speeds. This predictable distribution of molecular speeds is known as the Maxwell-Boltzmann distribution. The distribution of molecular speeds in liquids is comparable to that of gases but not identical and can help to understand the phenomenon of the boiling and vapor pressure of a liquid. Consider that a molecule requires a...
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Connective tissues perform a broad range of functions in the body. Their primary function is to connect and link different tissues in the body and act as packaging material between tissues. The areolar tissue, a connective tissue prototype, commonly cements various tissue types in diverse body organs. In contrast, adipose tissue cushions internal organs while insulating the body from heat loss.
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Updated: Jan 28, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact
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扫描的SQUID显微镜具有高速电气连接.

Ian W Haygood1, Bochao Xu2,3, John Biesecker1

  • 1National Institute of Standards and Technology, Boulder, Colorado 80305, USA.

The Review of scientific instruments
|January 26, 2026
PubMed
概括
此摘要是机器生成的。

我们开发了一种无冷扫描超导量子干扰装置 (SQUID) 显微镜,用于先进的材料分析. 该系统可实现高带宽的射频测量和在可变温度下敏感的磁性表征.

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Last Updated: Jan 28, 2026

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科学领域:

  • 物理 物理学 物理
  • 材料科学 材料科学 材料科学
  • 量子技术 量子技术 量子技术

背景情况:

  • 超导量子干扰装置 (SQUID) 对于敏感的磁场检测至关重要.
  • 现有的SQUID显微镜系统通常需要复杂的冷基础设施.
  • 无冷系统的进步对于更广泛的可访问性和应用至关重要.

研究的目的:

  • 介绍一款新的扫描超导量子干扰装置 (SQUID) 显微镜.
  • 为了证明其在无冷物质的冷机中的运行.
  • 突出其用于高带宽无线电频率 (RF) 测量和磁性表征的能力.

主要方法:

  • 使用平面梯度计直流SQUID与芯片上的场线圈用于susceptometry.
  • 在测试中的设备中集成了多达40个RF连接,带宽为20GHz.
  • 使用冷芯片插座和插座来最大限度地减少射频损失.
  • 实现了低残余磁场的积极和被动磁屏蔽.

主要成果:

  • 在基温为3.3K时,达到1.3μΦ0/Hz的系统噪声.
  • 证明了40K以上的同时磁力测量和敏感度测量.
  • 报告的往返射频损失在20 GHz时约为15dB.
  • 在样本位置达到低于100nT的余磁场.

结论:

  • 开发的无冷SQUID显微镜提供了多功能和灵敏的磁性测量能力.
  • 它的高射频带宽和可变温度操作扩大了材料科学和量子设备表征的潜在应用.
  • 该系统代表了迈向更容易获得和更先进的纳米级磁图像的重要一步.