Selectivity tuning

PID controller is a flexible, effective, and rehable controller for the process industries. A considerable range of controller actions is possible by selecting tuning parameters to provide different weights to the present (proportional), the past (integral), and the projected future (derivative). References related to the tuning of PID controllers are available (20—24). 

Other sources, such as compression temperature rise, driver-induced vibration, or component problems (bows) can contribute to the machine shaking. These must be treated as they occur. As a minimum, care must be used to understand the nature of the sources to keep them from interacting with the resonant frequencies of the compressor. The best remedy to stop the excitation at the source. If this is not possible, selective tuning and proper application of damping must be used. 

J. V. Hinshaw, Jr and L. S. Ettre, Selectivity tuning of serially connected open-tubular (capillary) columns in gas chromatography. Part 1 fundamental relationships , Chromatographia 21 561-572 (1986). 

In 1916, Alexanderson made another important contribution to radio broadcasting when he unveiled his tuned radio receiver, which allowed for selective tuning. It quickly became an integral part of radio broadcasting. 

One of these is electrochemical detection, which can be used with traditional CE as well as with the microchip design. Electrochemical detection generally provides good sensitivity and bulk property response (conductivity, potentiometry), and can be selectively tuned to a certain class of compounds (amperometry). ... 

Scheme 24 Selectivity tuning of MCRs involving cyclic 1,3-diketones...

Interesting reagents for such MCRs from the viewpoint of selectivity tuning are 5-aminopyrazoles containing carboxamide substituent. In the first article concerning the behavior of these aminozoles in the reactions with cyclic 1,3-diketone and aldehydes, it was found that only one direction of the treatment leads to tricyclic Biginelli-like heterocycles 61 (Scheme 30) [96]. 

Scheme 34 Selectivity tuning for MCRs involving barbituric acids...

Membrane technology could offer interesting possibilities in order to overcome these limitations and to improve the advantages of catalysis mediated by the decatungstate by the multiturnover recycling associated to heterogeneous supports, the selectivity tuning as a function of the substrate affinity towards the membrane, the effect of the polymeric microenvironment on catalyst stability and activity. 

Measurements of the controlled and the manipulated variables are used to estimate the parameters of a simple process model. This process model is then used to calculate the new control parameters based on a pre-selected tuning method. 

A notable substitution product of ruthenocene is ethynyl-ruthenocene, which can be bound to estradiol, a form of estrogen studied for breast cancer treatment. With the rigid alkyne spacer, the steroid s affinity to the estrogen receptor was surprisingly unchanged upon addition of the metallocene. The addition of organometallic complexes to biomolecules may allow for the selective tuning of properties of the molecule. ... 

Sandra, P Medvedovici, A. Kot, A. David, F. Selectivity Tuning in Packed Column Supercritical Fluid Chromatography, pp. 177-194 in Anton, K. Berger, C., eds., Supercritical Eluid Chromatography with Packed Columns. Dekker, New York (1998). 

Sandra P, Medvedovici A, Kot A, David F. Selectivity tuning in packed column SFC. In Anton K, Berger C, eds. Supercritical Fluid Chromatography with Packed Columns. Chromatographic Science Series. Vol. 75. New York Marcel Dekker, 1998, Chap 6. 

A popular technique is that of light (or photon) assisted OMVPE. Typically, a mercury lamp may be used to provide light at 185 and 254 nm, or a laser tuned to a specific wavelength may be used. In the case of UV assist, either the UV is used to assist with reactant decomposition — at or above the deposition plane, or the light is focused onto the substrate to promote reactivity and surface mobility. A laser, selectively tuned to a specific molecular transition, may be employed to promote molecules to an excited... 

Welsch, T., Dornberger, U., and Lerche, D. (1993) Selectivity tuning of serially coupled columns in high-performance liquid-chromatography. HRC-J. High Res. Chrom., 16 (1), 18-26. 

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