Filters tilting-filter

The samples had dry matter over 85% and were ground to pass through a 1 mm screen and then packed in a quartz-windowed cup. The unit was demonstrated at the 1971 Illinois State Fair. After the success of this instrument, Neotec (later Pacific Scientific, then NIR Systems, then Perstorp, then FOSS) built a rotating (tilting) filter instrument. Both instruments were dedicated, analog systems, neither of which was considered user-friendly. ... 

C) tilting filter mount (continuously moving) with detectors on four sides of sample cup. 

Comments vacuum belt, screens, belts, top feed drum tilting pan, vacuum drums or disks continuous filters vacuiun filter, rotary vacuum, pressiue filters batch cartridge, precoat drums, deep bed... 

Figure 4.1.9. Schematic of a tilting-fllter spectrometer. The three tilting filters provide for wavelength isolation in three regions of the NIR spectrum.

FIGURE 4.4 Two types of tilting filter instrument designs. 

One of the important goals of NIRS analysis has been uniformity of analysis, in otherwords, a sample should obtain the same analysis value from all instruments. The first effort by instrument manufacturers was to accomplish this goal using a slope-and-bias adjustment applied to analysis values. In 1986 a second method was developed that could be used with instruments generating spectra [97], in otherwords, monochromator or tilting filter instruments. This method adjusted the... 

The C-terminal transmembrane helix, the inner helix, faces the central pore while the N-terminal helix, the outer helix, faces the lipid membrane. The four inner helices of the molecule are tilted and kinked so that the subunits open like petals of a flower towards the outside of the cell (Figure 12.10). The open petals house the region of the polypeptide chain between the two transmembrane helices. This segment of about 30 residues contains an additional helix, the pore helix, and loop regions which form the outer part of the ion channel. One of these loop regions with its counterparts from the three other subunits forms the narrow selectivity filter that is responsible for ion selectivity. The central and inner parts of the ion channel are lined by residues from the four inner helices. 

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