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相关概念视频

Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
Electrical Synapses01:28

Electrical Synapses

Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...
Energy Stored In A Coaxial Cable01:31

Energy Stored In A Coaxial Cable

A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic field inside...
Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
Electrical Conductivity01:13

Electrical Conductivity

In perfect conductors, the electric field inside is always zero due to the abundance of free electrons, which nullify any field by flowing. As a result, any residual charge resides on the surface.
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...

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相关实验视频

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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
08:07

Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates

Published on: June 18, 2013

奥利戈恩单分子电线.

Changsheng Wang1, Andrei S Batsanov, Martin R Bryce

  • 1Department of Chemistry, Durham University, Durham DH1 3LE, United Kingdom.

Journal of the American Chemical Society
|October 15, 2009
PubMed
概括

我们测量了Oligoyne分子电线的电导率. 它们的导电性令人惊地独立于长度,这表明分子电子学的潜力.

科学领域:

  • 分子电子学分子电子学
  • 凝聚物质物理学 凝聚物质物理学
  • 有机化学 有机化学

背景情况:

  • 分子电线对于纳米电子设备至关重要.
  • 了解通过结合有机分子的电荷传输对于设计高效的分子电子元件至关重要.
  • 由于其刚性,线性结构,Oligoynes为分子电线提供了一个有前途的支架.

研究的目的:

  • 为了研究不同长度的Oligoyne分子电线的单分子电导率.
  • 探索分子结构和电极接触几何学对导电性的影响.
  • 评估奥利戈因作为分子电子电路构建块的潜力.

主要方法:

  • 扫描道显微镜 (STM) 分子断裂连接技术.
  • 制造金分子金 (AuidiyemoleculeidiyeAu) 连接点. 制造金分子金的连接点.
  • 实验测量得到了密度函数理论 (DFT) 和非平衡格林函数 (NEGF) 计算的补充.

主要成果:

  • 导电平面图显示了多个系列的峰值,表明了各种接触几何形状.
  • 较高的导电性与高度协调的黄金位点的基吸附相关.
  • 奥利戈因呈现出较低的衰变常数 (β值为0.06±0.03 Å-1),显示出对分子长度的导电性依赖性最小.

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Production of Dynein and Kinesin Motor Ensembles on DNA Origami Nanostructures for Single Molecule Observation
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Production of Dynein and Kinesin Motor Ensembles on DNA Origami Nanostructures for Single Molecule Observation

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Multi-unit Recording Methods to Characterize Neural Activity in the Locust (Schistocerca Americana) Olfactory Circuits
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Multi-unit Recording Methods to Characterize Neural Activity in the Locust (Schistocerca Americana) Olfactory Circuits

Published on: January 25, 2013

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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
08:07

Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates

Published on: June 18, 2013

Production of Dynein and Kinesin Motor Ensembles on DNA Origami Nanostructures for Single Molecule Observation
08:09

Production of Dynein and Kinesin Motor Ensembles on DNA Origami Nanostructures for Single Molecule Observation

Published on: October 15, 2019

Multi-unit Recording Methods to Characterize Neural Activity in the Locust (Schistocerca Americana) Olfactory Circuits
12:13

Multi-unit Recording Methods to Characterize Neural Activity in the Locust (Schistocerca Americana) Olfactory Circuits

Published on: January 25, 2013

结论:

  • 奥利戈恩分子电线表现出长度独立的导电能力,这是分子电子学中理想的特征.
  • 观察到的行为不同于在其他分子系统中看到的传统指数衰变,如4,4'-bipyridyl.
  • 奥利戈因和多聚因是未来电子电路集成的非常有前途的材料类.