Displays viewing distance

The size of the work surface is dependent on the task(s), documents, and technology. The primary working surface (e.g., supporting the keyboard, display, and documents) should be sufficient to (1) permit the screen to be moved forward or backward to a comfortable viewing distance for a range... 

Most ergonomics sources assume the standard viewing distance for displays as 28 in. from the display to the eyes. The sources give recommended dimensions for characters and display elements based on that distance. For other... 

Similar to a two-view display, there is an optimal viewing distance and in some regions it only gives a pseudo-stereoscopic view. The horizontal spatial resolution is reduced by a factor of the number of views. Moreover, the opaque barriers absorb a large portion of the light and significantly reduce the brightness. 

A display is in principle a 2D system (with the exception of special 3D displays). Thus it cannot be used to measure stereoscopic depth information. In return, it must be considered that the possible stereoscopic depth perception due to the curvature of the mirror may be lost. Further, stereoscopic depth perception for humans is only relevant for a relatively short distance of a few meters. For viewing distances such as those which result for the field of views of mirrors, depth perception takes place using other visual possibilities which are most definitely also included in the display image. That explains why distances as well as speeds can be judged comparatively well with a CMS as with a conventional mirror. A detailed analysis of the visual perception of humans is included in chapter Human Visual Perception . 

The increase in the blur circle diameter is gradual but not symmetrical for farther and closer distances than zq (see Fig. 10). The lower threshold for the distance rendered with acceptable sharpness shall be zi whereas the outer boarder shall be The depth-of-field describes this blur spectmm between zi and z in which the image still appears to be sharp due to the limited optical resolution of the eye and/or displaying device. Thus, the upper limit is not a fix value but is related to the resolution of the capturing and displacing device as well as the viewing distance and the human visual acuity (see Sect 5 of chapter Human Visual Perception ). 

A two-dimensional slice may be taken either parallel to one of the principal co-ordinate planes (X-Y, X-Z and Y-Z) selected from a menu, or in any arbitrary orientation defined on screen by the user. Once a slice through the data has been taken, and displayed on the screen, a number of tools are available to assist the operator with making measurements of indications. These tools allow measurement of distance between two points, calculation of 6dB or maximum amplitude length of a flaw, plotting of a 6dB contour, and textual aimotation of the view. Figure 11 shows 6dB sizing and annotation applied to a lack of fusion example. 

This section serves as a practical introduction to the SPARTANView program for Power Mac s and PC s (Windows 95/NT). It will show you how to 1) view and manipulate molecules on screen, 2) measure bond distances, angles and dihedral angles, 3) display energies, dipole moments, atomic charges and frequencies and 4) display graphical surfaces and maps. 

Regarding DSHEA, a pharmacist may be in violation if he or she displays a published article about a product beside that product in the pharmacy. DSHEA states that articles must be physically separated from the dietary supplements, but the distance is undefined [26]. Also, DSHEA states that another publication with a contrary view must be displayed, if available. 

Figure 2 yl possible mechanism for the attractive elastic interaction between sulfate ions on Cu(lll). (a) A schematic view of part of the Cu(lll) surface, showing the surface copper atoms (filled circles), (b) Upon adsorption of sulfate (large oval), the copper-copper distance is stretched, and copper atoms (filled circles) are displaced from their original positions (open circles). In total 8 surface atoms are shifted, (c) If two sulfates bind close to each other, then in total 14 surface atoms are shifted. If two sulfates bind far away from each other, then 16 surface atoms (twice the amount for the case displayed in (b)) will be shifted with respect to the second metal layer. Less reorganization of the surface atoms is therefore required when the sulfates bind close to each other. There is thus an effective attraction between the sulfates... 

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