Alignment problems

CWerhung rotors present an easier alignment problem because... 

Overhung rotors present an easier alignment problem beeause shaft-end alignment is neeessary only at the eoupling between the eompressor and driver. 

The graphical plotting technique for computing initial alignment can be performed with any of the three types of measurement fixtures (i.e. reverse dial indicator, rim-and-face, or optical). The following steps should be followed when plotting alignment problems ... 

CoMSIA (comparative molecular similarity index analysis) is a recent development from CoMFA and does not suffer from the alignment problem. It has been used to model hERG potassium channel inhibition by drugs [59] and the toxicity of phenylsulfonyl carboxylates [60], organophosphates [61], and polybrominated diphenyl ethers [62], with results comparable to those from CoMFA. 

In the first part of this paper several novel approaches to the alignment problem of second-order nonlinearity will be presented. The molecular information which guided and motivated these efforts, and others described in this symposium, derives from third-order nonlinear optical experimentation (EFISH and others). In the second... 

Where a significant lift is required such as offshore, several options are available such as a shaft driven, hydraulic drive or electrical submersible pump. Shaft driven vertical turbine pumps historically have been used extensively offshore, but recent reliability improvement with electrical submersible pumps and hydraulic drive units have been eagerly accepted as they eliminate alignment problems, topsides weight and in some instances are less complex than the right angle engine driven vertical turbine units. Hydraulic calculations for offshore pump installations must remember to account for tide and wave fluctuations. 

Being compact with no pump/motor alignment problems... 

Waterman algorithm uses DP to produce a quadratic-time solution to the local alignment problem. Thus, in most cases, both approaches are feasible, and the choice of alignment strategy is driven by the purpose of the pairwise comparison. 

Although less important than peak frequencies, peak intensities obviously play a role in quantitative analysis and, in many cases, qualitative identification. Multivariate calibration techniques and their transferability depend on reproducible relative peak heights. A possibly lengthy method development procedure may fail when a different spectrometer is used, if the observed intensities vary. Reproducibility of absolute signal is difficult to achieve between labs or even between instruments of the same design, but it is important for a particular instrument. Absolute intensities can at least be used to evaluate day-to-day instrument performance and to detect hardware or alignment problems. 

T. Havel and I. Najfeld, Applications of geometric algebra to the theory of molecular conformation. Part 1. The optimum alignment problem. J. Mol. Struct. (Theochem.) 308, 241-262 (1994). 

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