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関連する概念動画

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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関連する実験動画

Updated: Jun 19, 2026

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

オリゴイン (Oligoyne) 単一分子のワイヤ

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
まとめ
この要約は機械生成です。

オリゴイン分子ワイヤの電気伝導性を測定しました. 導電性は長さに驚くほど独立しており,分子電子学の可能性を示唆しています.

さらに関連する動画

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

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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

関連する実験動画

Last Updated: Jun 19, 2026

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

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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

科学分野:

  • 分子電子 (モレキュラー・エレクトロニクス)
  • 凝縮物質物理学 凝縮物質物理学
  • 有機化学 オーガニック・ケミストリー

背景:

  • 分子ワイヤーは,ナノスケールの電子機器にとって非常に重要です.
  • 結合された有機分子による電荷輸送の理解は,効率的な分子電子部品の設計に不可欠です.
  • オリゴインは,硬直で線形な構造のため,分子ワイヤの有望な支架を提供します.

研究 の 目的:

  • 異なる長さのオリゴイン分子ワイヤの単分子電気伝導性を調査する.
  • 分子構造と電極コンタクト幾何学の導電性に対する影響を調査する.
  • 分子電子回路の構成要素としてのオリゴインの可能性を評価する.

主な方法:

  • スキャン・トンネリング顕微鏡 (STM) 分子断裂結合技術.
  • 黄金分子黄金 (AuidiyemoleculeidiyeAu) 接点の製造について.
  • 密度関数理論 (DFT) と非均衡グリーンの関数 (NEGF) の計算で補完された実験的な測定.

主要な成果:

  • 導電ヒストグラムは複数のピークの連続を明らかにし,様々なコンタクト幾何学を示した.
  • より高い伝導性は,高度に調整された金部位でのピリジル群吸収と相関していた.
  • オリゴイネスは低衰退定数 (β値0.06 ± 0.03 Å−1) を示し,分子長さに最小の導電性依存を示した.

結論:

  • オリゴインの分子ワイヤは長さ独立の伝導性を示しており,これは分子電子学の望ましい特徴である.
  • 観測された行動は,4,4'-bipyridyl. . . のような他の分子システムで見られる伝統的な指数分解とは異なる.
  • オリゴインとポリインは,将来の電子回路統合のための非常に有望な材料のクラスです.