-
121
Algunas aplicaciones recientes de la técnica de radio ocultamiento satelital en el estudio de procesos atmosféricos
Published 2014-04-01“…La idea básica de un RO es observar como las ondas de radio emitidas por los GPS se propagan en la atmósfera. …”
Get full text
Article -
122
Hooks, Lines, and Sinkers: How Active Galactic Nucleus Feedback and Cosmic-Ray Transport Shape the Far-infrared–Radio Correlation of Galaxies
Published 2025-01-01“…The far-infrared–radio correlation (FRC) is one of the most promising empirical constraints on the role of cosmic rays (CRs) and magnetic fields in galaxy formation and evolution. …”
Get full text
Article -
123
Bayesian Approach to Equipartition Estimation of Magnetic Field Strength
Published 2025-01-01“…Energy equipartition between magnetic fields and CRs provides a convenient way to approximate magnetic field strength from radio observations. We present a new approach for calculating the equipartition magnetic field strength based on Bayesian methods. …”
Get full text
Article -
124
Design method of energy efficiency optimization in PLC-RF wireless transmission networks
Published 2023-04-01“…An energy efficiency optimization transmission scheme using angular information-based channel state information (AI-CSI) was proposed for indoor communications, which integrated the power line communication (PLC) with radio frequency (RF) wireless communication.Specifically, by considering that the Wi-Fi wireless network and the PLC network were the primary and secondary networks, an optimization problem was established to maximize the total energy efficiency of the secondary network.Then, in order to solve the problem, the beam forming weight vector was obtained by using zero-forcing method based on AI-CSI, and an optimization algorithm joint Dinkelbach with Lagrange multiplier was further presented to achieve the optimal power allocation.Finally, computer simulations were given to verify the effectiveness and superiority of the proposed scheme.Besides, the influence of key parameters such as the number of employed antennas and served users was also analyzed.…”
Get full text
Article -
125
A Reconfigurable Triple-Notch-Band Antenna Integrated with Defected Microstrip Structure Band-Stop Filter for Ultra-Wideband Cognitive Radio Applications
Published 2013-01-01“…Reconfigurable characteristics of the proposed cognitive radio antenna (CRA) are achieved by means of four ideal switches integrated on the DMS-BSF and the inverted π-shaped slot. …”
Get full text
Article -
126
La dimension vocale de la propagande
Published 2020-09-01“…The vocal dimension of propagandaThe visual aspect of the propaganda films, the manipulation produced by montage, dramaturgy and the specific relation between the text of the comments and presented images attracted comprehensibly much more attention than the voice used in the war propaganda films. …”
Get full text
Article -
127
Outage probability of multiuser cognitive MIMO system
Published 2009-01-01“…To analyze the multi-antenna gain in multiuser cognitive radio system, a multiuser cognitive MIMO framework was presented. …”
Get full text
Article -
128
Joint Beamforming and Power Control Algorithm for Cognitive MIMO System via Game Theory
Published 2015-08-01Get full text
Article -
129
New Lightning‐Derived Vertical Total Electron Content Data Provide Unique Global Ionospheric Measurements
Published 2022-05-01“…This VTEC data set, provided by Los Alamos National Laboratory (LANL), is derived from very high frequency (VHF; defined as 30–300 MHz) broadband radio‐frequency (RF) measurements of lightning made by U.S. …”
Get full text
Article -
130
Extracorporeal Ultrasound-Guided High Intensity Focused Ultrasound: Implications from the Present Clinical Trials
Published 2014-01-01“…Based upon evaluable data, the efficacy of HIFU was similar to that of radio frequency, chemoembolization, chemotherapy, radiotherapy, or hormone therapy; a combined therapy did not improve the efficacy. …”
Get full text
Article -
131
Earth Detecting Earth: At What Distance Could Earth’s Constellation of Technosignatures Be Detected with Present-day Technology?
Published 2025-01-01“…We evaluate the maximum distance of detectability for various present-day Earth technosignatures—radio transmissions, atmospheric technosignatures, optical and infrared signatures, and objects in space or on planetary surfaces—using only present-day Earth instruments, providing one of the first fully cross-wavelength comparisons of the growing toolbox of SETI techniques. …”
Get full text
Article -
132
Spectrum sensing algorithm based on average value of middle part of power spectral density
Published 2016-07-01Get full text
Article -
133
-
134
Child audiences in South Africa
Published 2022-10-01“… The consumption of media – especially radio and television – by children has been a topic of research for decades now. …”
Get full text
Article -
135
Research on a cooperative spectrum sensing algorithm based on energy-constraint
Published 2012-11-01“…With the aim of the realization of green energy-efficient cognitive communications,the energy consumption was mainly analyzed in the process of cooperative sensing and transmission,and an energy-efficient centralized cooperative spectrum sensing scheme was proposed.The spectrum sensing model of maximizing the detection lifetime of cognitive radio system was established and specified in detail.Furthermore,a searching method was presented to obtain the optimal detection lifetime and corresponding parameters.Simulation results reveal that the proposed scheme is able to extend detection lifetime and improve the probability of performing cooperative sensing for CR users with low SNR.…”
Get full text
Article -
136
Trust-Based Cooperative Spectrum Sensing Algorithm in Power Dedicated Network
Published 2015-03-01“…To fulfill the communication needs of smart distribution and utilization system,a novel power dedicated network has been developed.The system faces a problem that it may operate coexisted with a 230 data transceiver system.In order to keep the two systems operating stably and efficiently at the same time,a trust-based cooperative spectrum sensing algorithm was presented.According to the characteristics of user behavior,cognitive radio users were classified into fiduciary users,lapsed users and malicious users.By analyzing the relationship among detection result,credibility of cognitive radio users and communication channel signal-to-noise ratio,the credibility weight of cognitive radio users was given,and a trust-based cooperative spectrum sensing algorithm was proposed.The simulation results show that the algorithm improves detection performance effectively.…”
Get full text
Article -
137
Key techniques of cognitive convergence networks
Published 2014-06-01“…Concentrating on the development of heterogeneous cellular networks and cognitive radio networks, the cogni-tive cellular networks, femtocell and WiFi 2.0 networks were firstly summarized, respectively. …”
Get full text
Article -
138
Helical Magnetic Field in a Massive Protostellar Jet
Published 2025-01-01“…However, a unified explanation for their ejection and collimation remains elusive. In this study we present the first rotation measure analysis of the polarized synchrotron emission ever performed in a protostellar radio jet, which allows us to reveal its true 3D magnetic structure. …”
Get full text
Article -
139
PS1-11aop: Probing the Mass-loss History of a Luminous Interacting Supernova Prior to Its Final Eruption with Multiwavelength Observations
Published 2025-01-01“…We obtained multiple detections at the location of PS1-11aop in the radio and X-ray bands between 4 and 10 yr post-explosion, and if due to the supernova (SN), it is one of the most luminous radio SNe identified to date. …”
Get full text
Article -
140
