2024年9月28日 · Hz和毫秒不能直接换算，两者是交流电频率与周期的关系，并且是倒数关系：周期T=1/100=0.01秒=10毫秒。 100Hz即100次/秒，即60x100/60秒，即6000次/分钟。赫兹是电，磁，声波和机械振动周期循环时频率的单位。即每秒的周期次数(周期/秒)。

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7.31表示化学位移值，d为双峰，2H表示两个氢，J=2.0Hz表示偶合常数为2Hz。 108.1，CH-2/6表示与这两个氢相连的碳是2号和6号，它们的碳谱重合出在108.1。 后面的那个也是这个意思，s表示单峰。 那δH/δC是什么意思啊？ 3.87 s( 6H)/56.8,CH3-3/5-OMe;3.86 s (3H)/52.5,Me-8还麻烦在解释下。 万谢！ δH/δC是什么意思啊？ 3.87表示化学位移值，s为单峰，6H表示六个氢。 56.8,CH3-3/5-OMe表示与3.87这六个氢相连的碳是3号甲基碳和5号甲氧基碳，它们的碳谱重合出在56.8 …

2020年7月16日 · The frequency corresponding to an absorption line at 502 nm is approximately 5.98 × 1 0 14 Hz. This is calculated using the formula f = λ c , where c is the speed of light and λ is the wavelength in meters. Therefore, the correct multiple-choice option is C.

7.44 ppm和6.49 ppm峰，重峰数是d峰，偶合常数均为15.7 Hz，并结合碳谱上100-160 ppm的烯碳和芳碳的存在，提示为一个反式双键上的两个烯氢；7.15, 7.05, 6.83和6.76 ppm峰，结合100-160 ppm的烯碳和芳碳的存在，提示应该是苯环上7个芳氢；3.88 ppm峰，s峰，积分为3，提示为一个 ...

2023年12月11日 · Fabricated in 65-nm CMOS process, the proposed DPPLL is verified, and it achieves −122-dBc/Hz@1MHz phase noise and −66.3-dBc reference spur at 4.4-GHz output. The integrated jitter is 89.7 fs from 10 kHz to 100 MHz with a total power consumption of 10.4 mW at 1.2-V supply, and a −250.8-dB figure of merit (FOM) is achieved.

This paper presents a $3.96 \mathrm{~mW} \Delta \Sigma$ magnetometer with an input-referred noise of $45 \mathrm{pT} / \sqrt{ } \mathrm{Hz}$. Gain robustness is realized via a proposed background gain calibration and low-power CDS techniques.

dBc/Hz at 10 kHz offset and –113 dBc/Hz at 1 MHz offset. The integrated RMS jitter from 1 kHz to 10 MHz is 2.2 ps. The reference spur level is less than –68 dBc. Key words: phase-locked loop; adaptive frequency calibration; loop filter; CMOS; UWB DOI: 10.1088/1674-4926/30/7/075003 EEACC: 2220 1. Introduction

If the frequency of a photon is 3.96×1014 Hz, what the energy in kilojoules/mol, (kJ/mol) of 1 mole of these photons? Your solution’s ready to go! Our expert help has broken down your problem into an easy-to-learn solution you can count on.