Split couplings

Flanged couplings are used where there is free access to both shafts. Split couplings are used where access is limited on one side. Both flanged and split couplings require the use of keys and keyways. Compression couplings are used when it is not possible to use keys and keyways (e.g., brass shafts). 

NMR spectra result from the transition of an atomic nucleus in a magnetic field from a low-energy to a high-energy state [235], There are two aspects to the quantum-mechanical calculation of NMR spectra [301] calculation of shielding (chemical shifts) and calculation of splitting (coupling constants). Most of the... 

The system used to obtain the mass spectra was a Finnigan MAT Series 8230 instrument interfaced to a Carlo Erba 5360 Mega Series gas chromatograph (open split coupling via a flexible transfer line). 

Open-split coupling. The helium current protects the elu ent from air oxidation. 

Spin-spin splitting Coupling, or the splitting of an NMR spectral peak hy neighbors into more complex patterns. 

Spin The intrinsic angular momentum of an electron, nucleus, or other quantum-mechanical object. Spin-spin splitting Coupling, or the splitting of an NMR spectral peak by neighbors into more complex... 

Photoelectrochemical water splitting Photocatalytic water splitting Coupled photovoltaic - electrolysis systems Thermochemical conversion Photobiological methods Molecular artificial photosynthesis Plasma-chemical conversion Mechano-catalytic, magnetolysis, radiolysis, etc. 

In GC-MS systems, sample introduction is performed from the open capillary chromatographic column, either directly or via an open split coupling (see section 4.1). The ionization of the analytes is generally performed by either electron ionization or chemical ionization (see section 3.2). After the production of ions, these are separated according to their m/z ratio in the mass analyzer. Although linear quadrupole analyzers are most widely applied, other analyzer types, i.e, (magnetic) sector, quadrupole ion trap, and time-of-flight, are applied as well (see section 3.3). The detection of ions is mostly performed by means of an electron multiplier. 

Figure 5 Schematic diagram of the open split coupling for GC-MS.

The on-line capillary GC-MS combination can be achieved in two ways, i.e. via direct coupling or via an open-split coupling. 

An alternative to direct coupling is the open-split coupling a schematic diagram of such a device is shown in Figure 2. The column is connected with... 

Meili, J., Walls, F.C., Wilder, J.T. and Burlingame, A.L. (1977), Open-split coupling of wall coated open tubular (WCOT) capillaries to the ion source of a high resolution mass spectrometer. Proc. Ann. Conf. Mass Spectrom. Allied Top. 25th, Washington DC, p. 175. 

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