相关实验视频
Updated: May 22, 2025

09:37
In vivo Optogenetic Stimulation of the Rodent Central Nervous System
Published on: January 15, 2015
59.1K
在70kHz的快速MAS下进行低功率N解
Ekta Nehra1, Vipin Agarwal2, Yusuke Nishiyama1
1JEOL Ltd., Akishima, Tokyo, 196-8558, Japan.
Solid state nuclear magnetic resonance
|May 20, 2025
概括
这项研究引入了固态NMR的连续波 (CW) 14N解,显著提高了1H-14N旋转系统的分辨率和灵敏度,在快速魔力角旋转 (MAS) 中显著提高了分辨率和灵敏度. 这种技术提高了复杂的化学和生物样本的光谱清晰度.
科学领域:
- 固态核磁共振 (NMR) 光谱学
- 化学和生物系统的先进光谱技术.
背景情况:
- 在固体样本中实现高同位素分辨率对于准确的化学转移分配至关重要.
- 更快的魔法角旋转 (MAS) 放大了剩余二极分裂 (RDS) 和J合的挑战,特别是对于1H-14N键.
- 14N的强四极合阻碍了传统的1H-14N解,导致14N编辑光谱中的宽1H线宽和低灵敏度.
研究的目的:
- 开发和验证一种新的连续波 (CW) 14N解方法,用于在固态NMR中检测1H.
- 在快速MAS条件下,提高14N含有化合物的同位素1H峰值的分辨率和灵敏度.
- 用四极震动框架描述来分析解机制.
主要方法:
- 实现连续波 (CW) 14N解.
- 在快速MAS (70kHz) 下检测1H.
- 使用四极震动框架进行实验验证和分析.
主要成果:
- 使用在共振上低功率的14N CW辐射在快速MAS.证明更窄的1H线宽.
- 成功实现了14N-1H旋转对的有效解,克服了四极合的局限性.
- 为了解脱效率提供了一个理论框架.
结论:
- 拟议的CW 14N脱方法有效地提高了固态NMR的光谱分辨率和灵敏度.
- 该技术为分析常规脱失败的复杂1H-14N自旋系统提供了可行的解决方案.
- 这些发现有助于推进化学和生物应用的固态NMR方法.
相关概念视频
Maximum Power Transfer
196
Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
By substituting the entire circuit with...
196
Power Factor
358
The power factor is defined as the ratio of average (or active) power to apparent power, as illustrated by the relation
358
Non-ohmic Devices
1.0K
In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
1.0K
Instantaneous Power
350
Instantaneous power is important in electrical circuits, mainly when dealing with sinusoidal input. Instantaneous power, denoted as p(t), results from the multiplication of the instantaneous voltage (v(t)) across an element and the instantaneous current (i(t)) flowing through it. This relationship adheres to the passive sign convention and represents a fundamental principle in electrical engineering.
350
Electrical Power
3.0K
Electric power is the product of current and voltage, represented in units of joules per second, or watts. For example, cars often have one or more auxiliary power outlets with which you can charge a cell phone or other electronic devices. These outlets may be rated at 20 amps and 12 volts, so that the circuit can deliver a maximum power of 240 watts. Consider a 25 Watt bulb and a 60 Watt bulb. The conversion of electrical energy produces heat and light, while the kinetic energy lost by the...
3.0K
Power
11.0K
The concept of work involves force and displacement; meanwhile, the work-energy theorem relates the net work done on a body to the difference in its kinetic energy, calculated between two points on its trajectory. While none of these quantities or relations involves time explicitly, we know that the time available to accomplish work is often just as important as the amount of work itself. For example, sprinters in a race may have achieved the same velocity at the finish, therefore,...
11.0K

