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相关概念视频

5-Number Summary01:04

5-Number Summary

In a dataset, the 5-number summary includes the minimum data value, the data value of the first quartile, the median data value or data value of the second quartile, the data value of the third quartile, and the maximum data value. These 5 data values can be visualized as a box and whisker plot.
In a box plot, the minimum and maximum data values represent the lower and upper whiskers in the graph, and the median is designated as the center of the box in the chart. The first quartile and third...
Steps for Free-Body Diagram01:22

Steps for Free-Body Diagram

When it comes to studying the behavior of objects in mechanics, one of the most important tools available is the free-body diagram. Consider a simple example of a system of two blocks coupled by a massless string over a frictionless pulley. Block 1 is sliding over a table pulled by block 2 as block 2 falls under gravity.
To find the acceleration of the system, it is first necessary to calculate the net force on the system. In order to accomplish this, a free-body diagram can be created to...
Three Force Member01:27

Three Force Member

A rigid body subjected to three forces acting at three points is known as a three-force member. These forces must have concurrent lines of action, except for parallel forces, where the lines of action are parallel.
For example, consider a dumpster connected to a pin support at point A and a pin attached to a hydraulic cylinder at point B.
Method of Sections01:30

Method of Sections

Consider a truss structure, as shown in the figure.
Five-Factor Theory of Personality01:29

Five-Factor Theory of Personality

The five-factor model, often called the Big Five personality traits, is widely accepted in psychology as a comprehensive framework for understanding personality. These five traits — Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism — are often remembered using the acronym OCEAN.
Openness reflects creativity, curiosity, and openness to new experiences. Individuals scoring high in openness are imaginative, have a wide range of interests, and are independent thinkers. Low...
Geometric Sequences01:30

Geometric Sequences

In systems where values diminish by a constant proportion at each stage, the resulting sequence follows a geometric structure. Each new value in the sequence is obtained by applying a fixed multiplier to the preceding term. This regular, proportional decline type is often used to represent processes involving gradual loss, such as energy dissipation or reduction in amplitude over time.When analyzing the total effect of such a process across unlimited iterations, the series of values is referred...

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相关实验视频

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Design and Use of an Apparatus for Presenting Graspable Objects in 3D Workspace
09:11

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五环式梯子 素 素 素

Masafumi Unno1, Akiko Suto, Hideyuki Matsumoto

  • 1Department of Applied Chemistry, Faculty of Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan.

Journal of the American Chemical Society
|February 21, 2002
PubMed
概括

研究人员开发了一种新型的环延伸方法,用于梯子寡聚二氧化,首次成功合成了新型功能化的三环和五环氧化. 这些复杂的西洛干结构使用X射线晶体学得到证实.

科学领域:

  • 有机化学 有机化学
  • 材料科学 材料科学 材料科学
  • 超分子化学 超分子化学

背景情况:

  • 梯子寡氧二氧是一种独特的氧化合物,在材料科学中具有潜在的应用.
  • 以前的合成方法在创建复杂,功能化的梯子结构方面存在局限性.

研究的目的:

  • 开发一种新的环延伸方法,用于合成功能化的梯子寡糖酸.
  • 合成和表征了第一个功能化的三环和五环梯形素.

主要方法:

  • 通过使用特定的前体和反应条件,开发了一种新的环延伸反应.
  • 合成涉及 (i-PrSi(OH) O) 4与 (i-PrPhClSiO) 2在里丁中的反应.
  • 用AlCl3/HCl进行脱化,然后进行水解,用于分离关键中间体.
  • 采用X射线晶体学来确定合成化合物的精确结构.

主要成果:

  • 成功地建立了一种用于扩展梯形寡聚二氧化环的新方法.
  • 合成了第一个功能化的三环梯形氧,包括四烯和四基衍生物.
  • 第一个五环级梯子西洛用开发的方法合成.
  • X射线结晶学证实了新型三环和五环化合物的结构.

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结论:

  • 开发的环延伸方法是有效的创建复杂的,功能化的梯子寡.
  • 这项工作提供了对新型三环和五环素结构的访问.
  • 合成的化合物代表了先进材料和纳米技术的新建构块.