Results 61 to 70 of about 173,558 (169)

High Quality Ultrathin Bi2Se3 Films on CaF2 and CaF2/Si by Molecular Beam Epitaxy with a Radio Frequency Cracker Cell

, 2012
Here we report a method to fabricate high quality Bi2Se3 thin films using molecular beam epitaxy with a radio frequency cracker cell as an atomic selenium source.
Aharon Kapitulnik, Alexander Palevski, Cooper W. C., Li Zhang, Merav Dolev, Min Liu, Robert Hammond   +6 more
core   +1 more source

Effect of Location Accuracy and Shadowing on the Probability of Non-Interfering Concurrent Transmissions in Cognitive Ad Hoc Networks [PDF]

, 2013
Cognitive radio ad hoc systems can coexist with a primary network in a scanning-free region, which can be dimensioned by location awareness. This coexistence of networks improves system throughput and increases the efficiency of radio spectrum ...
Alfonso, Vitalio, Fernandez, Evelio M. G., Godoy, Walter, Montejo, Samuel, Souza, Richard Demo   +4 more
core   +1 more source

Nonthermal emission from the radio relic of the galaxy cluster A2256

, 2011
We aim to obtain a consistent description of non-thermal emissions from Abell 2256 and to give a prediction for a gamma-ray emission from this galaxy cluster.
Ando, Bagchi, Beck, Bonafede, Brentjens, Brunetti, Cassano, Clarke, Dennison, Dolag, Eckert, Enßlin, Enßlin, Fusco-Femiano, Fusco-Femiano, Fusco-Femiano, Fusco-Femiano, Giovannini, Kaastra, Kempner, Nevalainen, Pfrommer, Rephaeli, Sun, van Weeren   +24 more
core   +1 more source

Device-Free Localization via an Extreme Learning Machine with Parameterized Geometrical Feature Extraction

Sensors, 2017
Device-free localization (DFL) is becoming one of the new technologies in wireless localization field, due to its advantage that the target to be localized does not need to be attached to any electronic device.
Jie Zhang, Wendong Xiao, Sen Zhang, Shoudong Huang   +3 more
doaj   +1 more source

A Fast Radio Map Construction Method Merging Self-Adaptive Local Linear Embedding (LLE) and Graph-Based Label Propagation in WLAN Fingerprint Localization Systems

Sensors, 2020
Indoor WLAN fingerprint localization systems have been widely applied due to the simplicity of implementation on various mobile devices, including smartphones.
Yepeng Ni, Jianping Chai, Yan Wang, Weidong Fang   +3 more
doaj   +1 more source

Geomagnetism-Aided Indoor Wi-Fi Radio-Map Construction via Smartphone Crowdsourcing

Sensors, 2018
Wi-Fi radio-map construction is an important phase in indoor fingerprint localization systems. Traditional methods for Wi-Fi radio-map construction have the problems of being time-consuming and labor-intensive.
Wen Li, Dongyan Wei, Qifeng Lai, Xianghong Li, Hong Yuan   +4 more
doaj   +1 more source

Distance Measurements in UWB-Radio Localization Systems Corrected with a Feedforward Neural Network Model. [PDF]

Sensors (Basel), 2021
Krapež P, Vidmar M, Munih M.
europepmc   +1 more source

Passive Localization Utilizing Wireless RSSI: A Review

Cybernetics and Information Technologies
Localization is the process of determining the location of an object or device in an environment, and it can be achieved using radio frequency signals in wireless communication systems.
Jabbar Muhammad, Shoaib Umar, Zahoor Saliha, Chaudhry Shehzad Ashraf, Bhutta Muhammad Nasir Mumtaz   +4 more
doaj   +1 more source

Three-dimensional atom localization via probe absorption in a cascade four-level atomic system

Open Physics, 2018
For an atomic system with cascade four-level type, a useful scheme about three-dimensional (3D) atom localization is proposed. In our scheme the atomic system is coherently controlled by using a radio-frequency field to couple with two-folded levels ...
Zeng Wei, Deng Li, Chen Aixi
doaj   +1 more source

Effects of Local-Market Radio Ownership Concentration on Radio Localism, the Public Interest, and Listener Opinions and Use of Local Radio

Journal of Radio & Audio Media, 2011
The Telecommunications Act of 1996 and ensuing radio ownership consolidation are often blamed for harming radio localism and the public interest. The present research sought to determine effects of local-market radio ownership concentration on listener opinions and use of radio—potentially indicative of stations' localism and public service—by ...
openaire   +2 more sources