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Peter Hotton, Globe Correspondent
The solution is to simply rotate the drum while you're making a copy. If you rotate the drum in lockstep with the movement of the light beam across the original document, you can build the image strip by strip. After one strip of light is focused onto a corresponding swath of the drum...
If a wall turns out to be loadbearing, the work-around is to install some form of a concrete lintel or beam or steel joists to support the surface above before the wall can be shifted or removed. The exact kind of support will need to be prescribed by a professional architect, which p...
When somebody walks between the light source and the sensor, the path of the beam is blocked briefly. The sensor registers a drop in light levels and sends a signal to the control box. More advanced security systems include passive infrared (PIR) motion detectors. These sensors "see" the ...
However, a camera's lens focuses light, while the lenses used in holography cause the beam to spread out. A beam splitter: This is a device that uses mirrors and prisms to split one beam of light into two beams. Mirrors: These direct the beams of light to the correct locations. Along...
2.4GHz provides better coverage range and wall penetration, reaching up to 150 feet indoors. 5GHz offers faster speeds but shorter range, typically 50 feet. Use both bands: 2.4GHz for whole-house coverage 5GHz for high-speed connections
buildings. The easiest way to remove all of this clutter from the actual targets and improve radar performance is to filter it out by recognizing what's not Doppler-shifted. Police use dopler radars that only look for Doppler-shifted signals, and because the radar beam is a narrow beam, the...
ProQuest findarticles.com highbeam.com 相似文献BertelsmannSpringer takes over Netzeitung.(from Spray Network)(Brief Article) BACKGROUND: In the UK, medicines are being reclassified from prescription-only drugs to allow supply without prescription. This allows faster and easier ac... CA Oborne,ML ...
Each point in the scene emits light, and, just like the flashlight, the beam of light from that point passes through the pinhole and creates a point of light on the back wall. All of the points in the scene do that at the same time, so an entire image, in focus, appears on the ...