2015年10月1日 · See explanation. The basic principle of NMR is to apply an external magnetic field called B_0 and measure the frequency at which the nucleus achieves resonance. Electrons orbiting around the nucleus generate a small magnetic field that opposes B_0. In this case we say that electrons are shielding the nucleus from B_0. Shielding: The higher the electron density …

2015年1月5日 · The "bin" in a histogram is the choice of unit and spacing on the X-axis. All the data in a probability distribution represented visually by a histogram is filled into the corresponding bins. The height of each bin is a measurement of the frequency with which data appears inside the range of that bin in the distribution. By way of example, in this sample histogram below, …

2014年12月22日 · 243527 views around the world You can reuse this answer ...

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2015年9月23日 · The difference between seed plants and seedless plants is that seedless plants do not bear seeds for propagation, whereas seed plants bear seeds for multiplication.