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Photosensing Wireless Tags for Precise Location and Geometry Queries
Published in Syed Ahson, Mohammad Ilyas, RFID Handbook, 2017
Ramesh Raskar, Paul Beardsley, Paul Dietz, Jeroen van Baar
Location tracking using RF received signal strength or time of arrival is popular but requires multiple readers and the accuracy maybe insufficient for complex geometric procedures (Hightower and Borriello, 2001). Previous systems have also married RF tags with optical or ultrasound sensors to improve accuracy. Some systems use active RF tags that respond to laser pointers. The FindIT Flashlight uses a one-way interaction and an indicator light on the tag to signal that the desired object has been found (Ma and Paradiso, 2002). Other systems use a two-way interaction, where the tag responds back to the PDA using a power-hungry protocol like 802.11 or X10 (Patel and Abowd, 2003) and (Ringwald, 2002). CoolTown (The CoolTown Project, 2001) uses beacons that actively transmit devices references but without the ability to point and without visual feedback. The Cricket project (Teller et al., 2003) recovers pose of a handheld device using installed RF- and ultrasound-beacons, and does projected augmentation.
RFIG: Geometric Context of Wireless Tags
Published in Lu Yan, Yan Zhang, Laurence T. Yang, Huansheng Ning, The Internet of Things, 2008
Ramesh Raskar, Paul Beardsley, Paul Dietz, Jeroen van Baar
Location tracking using RF-received signal strength or time of arrival is popular, but requires multiple readers, and the accuracy may be insufficient for complex geometric procedures (Hightower and Borriello, 2001). Previous systems also have married RF tags with optical or ultrasound sensors to improve accuracy. Some systems use active RF tags that respond to laser pointers. The FindIT Flashlight project uses a one-way interaction and an indicator light on the tag to signal that the desired object has been found (Ma and Paradiso, 2002). Other systems use a two-way interaction where the tag responds back to the personal digital assistant (PDA) using a power-hungry protocol, such as the 802.11 or X10 (Patel and Abowd, 2003; Ringwald 2002). Cooltown (Hewlett Packard®) (The Cooltown Project, 2001) uses beacons that actively transmit device references, but without the ability to point and without visual feedback. The Cricket project (Teller et al., 2003) recovers PoseAware of a handheld device using installed RF and ultrasound beacons as well as doing recovers position and orientation of a handheld device.
Atomic Force Microscopy
Published in Thomas M. Nordlund, Peter M. Hoffmann, Quantitative Understanding of Biosystems, 2019
Thomas M. Nordlund, Peter M. Hoffmann
Cells are dependent on numerous specific interaction between biomolecules. Enzymes interact only with specific substrates, transcription factors bind only to specific DNA sequences, and antibodies recognize a specific intruding antigen. Without such specificity, life would not be possible. This specificity also allows biomolecular researchers to recognize, tag, and image specific biomolecules in a sea of other molecules. One way to do this is to tag a target molecule with a flourescent marker attached to a ligand that specifically binds to the target molecules. Then the presence of specific molecules can be determined using fluorescence microscopy, and the molecules can even be tracked at a single-molecule level using super-resolution techniques.
Diversified path loss performance of dual-Polarised MIMO antenna in sub-6 GHz for RFID applications
Published in International Journal of Electronics, 2023
Vipul Kaushal, Amit Birwal, Sandhya Malikar Patel, Kamlesh Patel
In Figure 2 (a), for Case 1 with r = 5 cm, the path loss varies from 14 dB to 19 dB in the 3.5–3.75 GHz band, whereas it is found to be 33 dB at the maximum range of r = 25 cm due to multi-path propagation and attenuation. For Case 2, i.e., SEA I and SEA II are in a cross-polarisation scheme, this loss increases to about 32 dB for r = 5 cm, whereas at r = 25 cm, it is 41 dB as illustrated in Figure 2(a). In the backward link response shown in Figure 2 (b), similar PL values are obtained for Case 1 and Case 2 as given in Figure 2(a), which confirms that any port or SEA can be used as a tag or reader antenna due to properly matched. However, the increase in path loss is highly dependent on the orientation of transmission and reception. This feature limits the tag range as the PL values for Case 1 at r = 25 cm are closer to the PL values for Case 2 at r = 25 cm.
SurfaceLens: near-surface spatial interaction with science museum exhibits
Published in Digital Creativity, 2022
HyeonBeom Yi, Seung Hyeon Han, Min Kyoung Park, Woohun Lee
We also designed near-surface interaction with a world map, which contained 41 volcano images and related information. As shown in Figure 4, the world map had four portals (RFID tag) in the Atlantic Ocean, Pacific Ocean, Asian continent, and American continent. When a tag was detected, the SurfaceLens provided a high-resolution satellite world map aligned with the location of the RFID tag as the origin. Within the viewer, green arrows guide visitors to find the closest volcanos located around the world. When the viewer’s aim is overlaid on a volcano icon, it activates visual and sound effects. In addition, a text box beneath the viewer provides detailed information about the volcano, and real images with interpretations are shown when the ‘more information’ button is pressed. When activating each volcano, the viewer's ring on the GUI shows how many of the volcanos are to be found with a gauge – when 10 or more are found, the ‘ring of fire’ is activated, by means of a red trace around Pacific Ocean.
Adult sea lamprey respond to induced turbulence in a low current system
Published in Journal of Ecohydraulics, 2021
D. P. Zielinski, S. Miehls, G. Burns, C. Coutant
Sea lamprey were externally tagged with either a 38 mm chemiluminescent (similar to Bevelhimer and Coutant 2008) or 35 mm red mini-LED tag between 10 and 14 h prior to release in the Ocqueoc River. Sea lamprey were tagged in groups of 20 (4 LED and 16 chemiluminescent tags). Each tag was encased in clear surgical tubing and sutured about 1 cm posterior to the anterior end of the rear dorsal fin. Immediately after tagging, sea lamprey were transported to the Ocqueoc River in aerated tanks and placed in an acclimation cage (1 m3) about 100 m downstream of the FVES. Tags were activated approximately 6 h prior to release and both tags had a tag life in excess of 12 h. Both tags allowed for bank side visual tracking of sea lamprey, but the LED tags could also be tracked by infrared cameras mounted above the experimental arena.