Chevron mounting

Two channelplates in a Chevron mounting can be used as a position-sensitive detector (see Fig. 4.18) provided the collector anode is able to preserve the position information which then has to be transferred to suitable electronics. Position-sensitive detectors are used in electron spectrometry mainly for four different applications ... 

Fixed ventilation has to be weatherproof to some degree. If it were not, then a simple hole in the wall or roof would be sufficient. The normal form of fixed ventilator is the louver panel. At its simplest, this may be a number of slats of wood mounted at 45-60° in a door or wall opening, and at its most sophisticated an aerodynamically designed two- or three-bank chevron of roll-formed or extruded aluminum (Figure 28.6). 

A secondary seal for the rotating ring mount usually O-rings, or or chevron seals. 

Besides space charge, image quality is limited by the combination of the number of pixels of the CCD camera and the size of a single ion event. The PSD usually employs two micro-channel plates (MCPs) mounted in a chevron configuration and backed by a phosphor screen. A product ion causes an electron cascade through the channel plates and onto the phosphor, which emits a pulse of diffuse light that must be focused properly onto the CCD array with a camera lens or fiber optic taper. In this process one product ion results in a signal on the CCD that is usually several pixels... 

Answer by Author If we assume an emissivity of 0.9 for the black chevrons and of 0.1 for the polished cold plate, the thermal load on the helium panel, due to an external heat source would equal approximately 1% of the external heat load incident on the chevron plane. It should be rioted, however, that with the cryopump mounted in the rear of a chamber, the chevrons will be radially oriented and will therefore not be exposed to direct radiation from an axial heat source. 

PPS is primarily used for surface mounted connectors and optical pick-up units but it is also replacing conventional materials in such applications as housings for mobile phones and other mobile information devices. New product grades include Ryton R-4-260 PPS from Chevron Phillips Chemical Co., which is a glass-filled PPS for electronics applications. Its properties include low flashing and low outgassing tendencies. 

Figure 7, for instance, shows an application of EVDs, in which the devices are mounted as part of chevron steel braces externally connected to the main structural frame. In this way, energy is dissipated through the shear deformations within each EVD (Fig. 7a), which in turn are caused by the relative movements of the stories. 

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