Results 41 to 50 of about 520,343 (350)

On the detection of a solar radio burst event that occurred on 28 August 2022 and its effect on GNSS signals as observed by ionospheric scintillation monitors distributed over the American sector

Journal of Space Weather and Space Climate, 2023
As part of an effort to observe and study ionospheric disturbances and their effects on radio signals used by Global Navigation Satellite Systems (GNSS), alternative low-cost GNSS-based ionospheric scintillation and total electron content (TEC) monitors ...
Wright Isaac G., Rodrigues Fabiano S., Gomez Socola Josemaria, Moraes Alison O., Monico João F. G., Sojka Jan, Scherliess Ludger, Layne Dan, Paulino Igo, Buriti Ricardo A., Brum Christiano G. M., Terra Pedrina, Deshpande Kshitija, Vaggu Pralay R., Erickson Philip J., Frissell Nathaniel A., Makela Jonathan J., Scipión Danny   +17 more
doaj   +1 more source

A novel-iterative simulation method for performance analysis of non-coherent FSK/ASK systems over Rice/Rayleigh channels using the wolfram language [PDF]

Serbian Journal of Electrical Engineering, 2016
In this paper, a new approach in solving and analysing the performances of the digital telecommunication non-coherent FSK/ASK system in the presence of noise is derived, by using a computer algebra system.
Mladenović Vladimir, Milošević Danijela   +1 more
doaj   +1 more source

The fading American dream: Trends in absolute income mobility since 1940

Science, 2016
Aspiring to do better than one's parents The American dream promises that hard work and opportunity will lead to a better life. Although the specifics of what constitutes a better life vary from generation to generation, one constant is that children ...
Raj Chetty, D. Grusky, M. Hell, Nathaniel Hendren, Robert A. Manduca, Jimmy Narang   +5 more
semanticscholar   +1 more source

Burstiness of Interference Pikes in Wireless Networks

IEEE Open Journal of Vehicular Technology, 2023
The temporal dynamics of interference in wireless networks affects their performance but has only been studied for some cases. This article addresses this gap by analyzing high-interference events, called pikes, concluding that they arrive in bursts in ...
Mahin K. Atiq, Udo Schilcher, Xhemal Pengili, Martin Haenggi, Christian Bettstetter   +4 more
doaj   +1 more source

On Modeling Coverage and Rate of Random Cellular Networks under Generic Channel Fading [PDF]

, 2015
In this paper we provide an analytic framework for computing the expected downlink coverage probability, and the associated data rate of cellular networks, where base stations are distributed in a random manner. The provided expressions are in computable
Al-Hourani, Akram, Kandeepan, Sithamparanathan   +1 more
core   +3 more sources

Factors modulating 99mTc‐MAA planar lung dosimetry for 90Y radioembolization

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract Purpose To investigate the accuracy and biases of predicted lung shunt fraction (LSF) and lung dose (LD) calculations via 99mTc‐macro‐aggregated albumin (99mTc‐MAA) planar imaging for treatment planning of 90Y‐microsphere radioembolization.
Benjamin P. Lopez, Armeen Mahvash, James P. Long, Marnix G. E. H. Lam, S. Cheenu Kappadath   +4 more
wiley   +1 more source

High-speed braking properties of Cu-based powder metallurgy brake pads

Fenmo yejin jishu, 2023
Friction coefficients of the Cu-based powder metallurgical brake pads decline due to the high temperature during the high-speed braking, which will directly affect the train braking effectiveness.
LIU Sihan, GENG Xueqian, WANG Ye, MA Yunzhang, CHEN Defeng, ZHANG Bo, CAO Hongfa, QI Ji, LÜ Baojia   +8 more
doaj   +1 more source

COMP Report: CPQR technical quality control guidelines for use of positron emission tomography/computed tomography in radiation treatment planning

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract Positron emission tomography with x‐ray computed tomography (PET/CT) is increasingly being utilized for radiation treatment planning (RTP). Accurate delivery of RT therefore depends on quality PET/CT data. This study covers quality control (QC) procedures required for PET/CT for diagnostic imaging and incremental QC required for RTP.
Ran Klein, Mike Oliver, Dan La Russa, John Agapito, Stewart Gaede, JeanPierre Bissonnette, Arman Rahmim, Carlos Uribe   +7 more
wiley   +1 more source

Image quality improvement in low‐dose chest CT with deep learning image reconstruction

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract Objectives To investigate the clinical utility of deep learning image reconstruction (DLIR) for improving image quality in low‐dose chest CT in comparison with 40% adaptive statistical iterative reconstruction‐Veo (ASiR‐V40%) algorithm. Methods This retrospective study included 86 patients who underwent low‐dose CT for lung cancer screening ...
Qian Tian, Xinyu Li, Jianying Li, Yannan Cheng, Xinyi Niu, Shumeng Zhu, Wenting Xu, Jianxin Guo   +7 more
wiley   +1 more source

Methodology for Estimating Communication Reliability in Shortwave Radio-Frequency Transmission Channels with Rician Fading Given Ionospheric Diffusivity

Известия высших учебных заведений России: Радиоэлектроника, 2022
Introduction. There exists a technique for estimating the dependence of communication reliability in a shortwave radio-frequency transmission channel (SWRC) with a single discrete beam and diffuse wave scattering across small-scale ionospheric ...
V. P. Pashintsev, D. A. Belokon, S. A. Koval, A. D. Skorik   +3 more
doaj   +1 more source