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相关概念视频

Gene Conversion02:08

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
Gene Conversion02:08

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
Sign Convention01:30

Sign Convention

When analyzing a beam subjected to various loads, it is crucial to understand the internal forces and moments generated within the structure. These internal forces can be broadly classified into normal forces, shear forces, and bending moments. To determine these forces and moments, we use the method of sections and apply a specific sign convention based on their direction and the side of the section being analyzed.
The normal force acts perpendicular to the beam's cross-section and can cause...
Transformation of Plane Strain01:12

Transformation of Plane Strain

When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
Transformations of Functions I01:29

Transformations of Functions I

A function's graph can be modified by changing its position or size without altering its overall shape. These transformations allow the graph to be moved across the coordinate plane while preserving its pattern and structure. One of the most common transformations is shifting, which repositions the graph without distorting it.When the output of a function is adjusted by adding or subtracting a constant, the graph shifts vertically. A positive value moves the graph upward, while a negative value...
Transformations of Functions III01:20

Transformations of Functions III

Transformations modify the graphical representation of a function without changing its fundamental form. One common transformation is reflection, which flips the graph across a designated axis. When the vertical coordinates of all points are multiplied by the negative one, the entire graph is mirrored over the horizontal axis. This transformation reverses the vertical orientation of peaks and troughs, akin to signal inversion in electrical systems, where a waveform is flipped, but the timing of...

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Patterning via Optical Saturable Transitions - Fabrication and Characterization
08:19

Patterning via Optical Saturable Transitions - Fabrication and Characterization

Published on: December 11, 2014

通过有针对性的结构扭曲进行旋转切换.

Constantinos J Milios1, Alina Vinslava, Wolfgang Wernsdorfer

  • 1School of Chemistry, The University of Edinburgh, West Mains Road, Edinburgh, UK.

Journal of the American Chemical Society
|April 27, 2007
PubMed
概括
此摘要是机器生成的。

集群中的结构扭曲会产生新的单分子磁铁 (SMM),具有更高的自旋状态和更好的性能. 这项研究提高了SMM设计,用于先进的磁性应用.

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Patterning via Optical Saturable Transitions - Fabrication and Characterization
08:19

Patterning via Optical Saturable Transitions - Fabrication and Characterization

Published on: December 11, 2014

Operation of the Collaborative Composite Manufacturing (CCM) System
10:09

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Published on: October 1, 2019

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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科学领域:

  • 无机化学 无机化学 有机化学
  • 材料科学 材料科学 材料科学
  • 磁力学 磁力学 是一种

背景情况:

  • 单分子磁铁 (SMM) 是在分子水平上表现出磁性歇斯底里的分子.
  • 开发具有高旋转基态和高阻塞温度的SMM对于其实际应用至关重要.
  • [MnIII6O2(sao) 6(O2CR) 2L4家族的SMM提供了一个通过结构修改调整磁性质的平台.

研究的目的:

  • 为了研究逐步结构扭曲对团磁性特性的影响.
  • 为了合成和表征新的SMM,增强旋转基状况和阻塞温度.
  • 了解分子结构,连接体替代和磁交换相互作用之间的关系.

主要方法:

  • 合成新型集群复合物,使用衍生氧化联体和大型碳酸盐.
  • 单晶X射线衍射以确定详细的分子结构.
  • 测量磁敏度以确定旋转基态 (S) 和有效激活能量 (Ueff).

主要成果:

  • 合成了一系列[MnIII6O2(sao) 6(O2CR) 2L4]复合物,SMM表现出S = 7和S = 12的基本状态.
  • 复合体2 ([MnIII6O2(Et-sao) 6 ((O2CCMe3) 2 ((EtOH) 5)) 显示了S=7的基本状态和Ueff=30K.
  • 复合物3 ([MnIII6O2(Et-sao) 6 ((O2CPh) 2 ((EtOH) 4 ((H2O) 2)) 显示出一个显著的S=12基态和Ueff=53K.
  • 连接物替代引发了微妙的结构扭曲,导致从反铁磁交换相互作用转向铁磁交换相互作用.

结论:

  • 通过连接物修饰逐步结构扭曲是提高SMM性能的有效策略.
  • 观察到的旋转基态和阻塞温度的增加归因于分子几何学和磁交换路径的改变.
  • 这项工作为高性能单分子磁铁的合理设计提供了宝贵的见解.