Single-layer reticulated shell structures are widely used, but their stability performance is not ideal. Moreover, they sensitive to structural damage and imperfections, while the existing conventional design methods of increasing cross-section, strengthening corrosion protection, densifying grid economical. This study employs a modified bionic structure—a spiral single-layer structure—to solve...

New pickup designs for a Bunch Arrival time Monitor (BAM) at the Free Electron Laser in Hamburg (FLASH) have been developed and simulated [1, 2] with CST PARTICLE STUDIO R ©. With regard to the signal characteristics and manufacturability a cone-shaped pickup was selected as a prospective candidate. At high frequencies, small manufacturing tolerances might have great influence on the pickup sig...

The purpose of this study was to survey current departmental policies on treatment couch overrides and the values of table tolerances used clinically. A 25-question electronic survey on couch overrides and tolerances was sent to full members of the American Association of Physicists in Medicine (AAPM). The first part of the survey asked participants if table overrides were allowed at their inst...

The map and the model designed by a designer and presented to a manufacturer in the form of a map is the result of his knowledge and innovation. The manufacturer, in turn, uses his best effort to produce a part accordingly. However, because of production problems and raw material, producing a precise part is very difficult and costly. One of the most important problems in this regard is designi...

The 14 geometrical tolerances defined in ISO 1101 are supplemented by the alphanumerical symbols this standard and some other standards. CZ (combined zone), SZ (separate zones) SIM (simultaneous requirement), which crucial for development of robust measuring programs coordinate machines, were introduced at different times or It is shown that symbol definitions not always complete. Sometimes the...