Results 31 to 40 of about 1,168,729 (288)

Inertial measurement unit–aided dual-frequency radio frequency identification localization in line-of-sight and non-line-of-sight hybrid environment

International Journal of Distributed Sensor Networks, 2018
The mitigation of non-line-of-sight propagation conditions is one of main challenges in wireless signal–based indoor localization. When radio frequency identification localization technology is applied in applications, the received signal strength ...
Jie Wu, Minghua Zhu, Bo Xiao, Wei He
doaj   +1 more source

Volatile-Rich Circumstellar Gas in the Unusual 49 Ceti Debris Disk

, 2014
We present Hubble Space Telescope STIS far-UV spectra of the edge-on disk around 49 Ceti, one of the very few debris disks showing sub-mm CO emission.
Grady, Carol A., Kamp, Inga, Roberge, Aki, Weinberger, Alycia J., Welsh, Barry Y.   +4 more
core   +1 more source

A far-UV survey of three hot, metal-polluted white dwarf stars: WD0455-282, WD0621-376, and WD2211-495 [PDF]

, 2019
Using newly obtained high-resolution data ($R\sim{1\times{10}^{5}}$) from the \textit{Hubble Space Telescope}, and archival UV data from the \textit{Far Ultraviolet Spectroscopic Explorer} we have conducted a detailed UV survey of the three hot, metal ...
Ayres, T., Bainbridge, M., Barrow, J. D., Barstow, M. A., Holberg, J. B., Hu, J., Lee, C. C., Preval, S. P., Reindl, N., Webb, J. K.   +9 more
core   +2 more sources

A mobile localization method based on a robust extend Kalman filter and improved M-estimation in Internet of things

International Journal of Distributed Sensor Networks, 2020
As the key technology for Internet of things, wireless sensor networks have received more attentions in recent years. Mobile localization is one of the significant topics in wireless sensor networks.
Nan Hu, Chuan Lin, Fangjun Luan, Chengdong Wu, Qi Song, Li Chen   +5 more
doaj   +1 more source

Optimum Model for Tracking of Moving Objects

Pakistan Journal of Engineering & Technology, 2023
 In wireless communication, it is a challenge to find the accurate position of moving objects. The presented work proposes the GPS receiver to measure the position and velocity of moving objects.
Muzaffar Hussain, Lubna Farhi, Farhan Ur Rehman   +2 more
doaj   +1 more source

A fourth HI 21-cm absorption system in the sight-line of MG J0414+0534: a record for intervening absorbers [PDF]

, 2013
We report the detection of a strong HI 21-cm absorption system at z=0.5344, as well as a candidate system at z=0.3389, in the sight-line towards the z=2.64 quasar MG J0414+0534.
Bignell, C., Curran, S. J., Tanna, A., Webb, J. K., Whiting, M. T.   +4 more
core   +1 more source

Cosmological Constraints from the Anisotropic Clustering Analysis using BOSS DR9

, 2013
Our observations of the Universe are fundamentally anisotropic, with data from galaxies separated transverse to the line of sight coming from the same epoch while that from galaxies separated parallel to the line of sight coming from different times ...
Linder, Eric V., Oh, MinJi, Okumura, Teppei, Sabiu, Cristiano G., Song, Yong-Seon   +4 more
core   +1 more source

The mysterious optical afterglow spectrum of GRB140506A at z=0.889 [PDF]

, 2014
Context. Gamma-ray burst (GRBs) afterglows probe sightlines to star-forming regions in distant star-forming galaxies. Here we present a study of the peculiar afterglow spectrum of the z = 0.889 Swift GRB 140506A. Aims. Our aim is to understand the origin
Bolmer, J., Cano, Z., Christensen, L., Covino, S., D'Elia, V., Flores, H., Friis, M., Fynbo, J. P. U., Goldoni, P., Greiner, J., Guelbenzu, A. Nicuesa, Hammer, F., Hjorth, J., Jakobsson, P., Japelj, J., Kaper, L., Klose, S., Knust, F., Krühler, T., Ledoux, C., Leighly, K., Leloudas, G., Levan, A., Malesani, D., Milvang-Jensen, B., Møller, P., Noterdaeme, P., Oates, S., Pian, E., Postigo, A. de Ugarte, Schady, P., Schulze, S., Sparre, M., Tagliaferri, G., Tanvir, N., Thöne, C. C., Vergani, S., Vreeswijk, P. M., Watson, D., Wiersema, K., Wijers, R. A. M. J., Xu, D., Zafar, T.   +42 more
core   +6 more sources

Empowering IoT: leveraging data sensor communication with LoRAWAN in diverse environments

Acta Polytechnica
The Internet of Things (IoT) connects countless devices, such as sensors and actuators, necessitating an efficient long-range communication technology.
Noprianto Noprianto, Habibie Ed Dien, Septian Enggar Sukmana, Fayyadh Al Baity, Mustika Mentari   +4 more
doaj   +1 more source

Measurements and Models of 915 MHz LoRa Radio Propagation in an Underground Gold Mine

Sensors, 2022
Underground mining increasingly relies on wireless communications for its operations. The move to automating many underground mining processes makes an understanding of the propagation characteristics of key wireless technologies underground a topic of ...
Philip Branch
doaj   +1 more source