Push mode

Fig. 6. Manipulation curves of C6o molecules on a Si(100)-2 x 1 surface demonstrating (a) pulling and (b) pushing mode, (c) Probability distribution for successful attempts as a function of relative tip-surface separation (initial parameters U = —3V and I = -0.1 nA) [15],...

Constant height repulsive (pushing mode) manipulation of a Cm molecule covalently bound to the Si(OOl) surface is modelled using ab initio density functional theory, with the scanning tunneling microscope tip included explicitly in the calculations. The formation of chemical bonds between the tip and the molecule is demonstrated. The bonds between the molecule, tip and surface are constantly rearranging, so that a continuous manipulation process is possible. Tip-induced manipulation considered here is compared with the tip-free model, and the effects due to the tip are discussed. 

Fig. 10.3 The feed organizer comprised of a step with four holes to accommodate four coaxial cables for feeding the two sets of orthogonal dipoles. Originally Intended to merely provide mechanical support, it apparently also suppresses the common or the push-push mode.

In the piezoelectric method, a piezoceramic deforms in response to the electronic signal and forces ink out of the orifice. Different manufacturers of these devices utilize different geometries, giving rise to so-called squeeze, bend, push, and shear modes of operation. Squeeze mode print heads are, by now, more a matter of historical interest, and shear mode devices have not yet made a significant commercial impact. Bend and push mode devices, illustrated in Fig. 11, are both commonplace designs in ink-jet printers offered to office, home, and commercial printing markets by a number of manufacturers, including Dataproducts, Epson, Sharp, Tektronix, and Xerox. 

FIGURE 11 Two geometries of piezoelectric driven drop-on-demand print heads bend-mode (top) and push-mode (bottom). (From Le, H. R (1998). J. Imaging Sci. Technol. 42,49-62 by permission of the copyright holder, the Society for Imaging Science and Technology.]... 

Figure 10.408 Dionex AS-AP Autosampier piumbing schematic for Push Mode with the Dionex Sampie Conductivity and pH Accessory.

In manual mode, the engine can be started and stopped locally, through a pair of start and stop push buttons Nos 17 and 18. provided on the AMF panel (Figure 16.11). 

The eommon topologies whieh are eneompassed under this eategory are the buek, half-forward, push-pull, half and full bridge, with only the traditional voltage-mode eontrol method. Its representative eireuit diagram is given in... 

In the Model 811 the various settings of the mode switch yield pH, solution temperature, electrode potential, electrode slope and time of day an illuminated push-button signals the moment that stable readings have been obtained. Two-point standardization may be carried out on any pair of buffers in any order. 

Mode indicating lights. Located directly below the manual push buttons, these lights indicate the operating mode of the controller. When in manual mode, the left light, labeled "M", will be lit when in the automatic mode, the right light, labeled "A", will be lit. 

Figure 8-4 Signs of Core Saturation in the Push-Pull, with Voltage-Mode Control...

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