Exactive Plus EMR总共具有五档不同的分辨率,供不同分析目的使用。首先,由于在非变性状态下蛋白质样品更不易带电,与变性条件下相比,150kDa的单克隆抗体出峰在m/z 5000-8000的范围内,明显向高质量端移动。Exactive Plus EMR的m/z上限拓展至20000,可轻松胜任非变性条件下单克隆抗体乃至其多聚体的分析需求。其次,即使在最低分辨率下,仍能采集到高信噪比、基线干净的谱图,证明了Orbitrap系统所具有的高灵敏度、高质量精度和高稳定性等优点可以生成高质量、高可信度的原始数据。
The pressure field within the near field periphery of a small scale rotor blade is investigated by means ofclassical statistical analysis techniques and proper orthogonal decomposition. The signatures are acquired usinga circular arc array of dynamic pressure transducers, centered on the rotor tip at a distance of 1.5 chordlengths and below the tip path plane. The rotor is set to collective pitch angles ranging from 0. to 12. andis operated at 35Hz and 25Hz rotor speeds under hover conditions. Each blade from this two bladed rotoris investigated independently in order to isolate pressure signal differences existing between the blades. Theresults show that while the average inter-blade signatures are relatively constant, the variance of the fluctuationspossess noticeably different amplitudes. Given the scale of the rotor, these differences are attributedto the surface roughness effects. A low-dimensional analysis reveals that the first few most energetic modesproduced by each blade are relatively consistent in shape and so concerns about differences between the signaturesproduced by each blade are contracted. Two important features about the near-field signatures arethen revealed. The first is a low frequency, low wave-number type oscillation and is observed in all microphonesignals positioned between the tip path plane and 75. below. The second signature however comprises a highfrequency, high wave-number signature that manifests itself at shallow angles relative to the tip path plane ofthe rotor. The latter of these is believed to be the associated with the radiating component of the pressure fieldproduced by interactions of the rotor blade with the tip-vortex. A low-dimensional reconstruction of the rawpressure signal illustrates how each of these signatures contribute independently to the original raw signal.