Results 31 to 40 of about 770,565 (262)

Limit on the Detectability of the Energy Scale of Inflation

Physical Review Letters, 2002
We show that the polarization of the cosmic microwave background can be used to detect gravity waves from inflation if the energy scale of inflation is above 3.2 times 10^15 GeV. These gravity waves generate polarization patterns with a curl, whereas (to first order in perturbation theory) density perturbations do not.
Knox, Lloyd, Song, Yong-Seon
openaire   +3 more sources

Design of Spectrum Usage Detection in Wideband Spectrum Measurements

IEEE Access, 2019
We investigate the design of signal processing in wideband spectrum usage (SPU) measurements for efficient and smart dynamic spectrum access (DSA). In particular, we focus on spectrum usage detection (SPUD) in the experimental measurements. The detection
Kenta Umebayashi, Yoshitaka Tamaki, Miguel Lopez-Benitez, Janne J. Lehtomaki   +3 more
doaj   +1 more source

Optimal Voting Rule and Minimization of Total Error Rate in Cooperative Spectrum Sensing for Cognitive Radio Networks

Journal of Telecommunications and Information Technology, 2021
In cognitive radio technology, spectrum sensing is essential for detecting spectrum holes which may be allotted to secondary users. In this paper, an optimal voting rule is used for cooperative spectrum sensing while minimizing the total error rate (TER)
Samit Kumar Ghosh, Sachin Ravikant Trankatwar, P. Bachan   +2 more
doaj   +1 more source

The Improved Adaptive Silence Period Algorithm over Time-Variant Channels in the Cognitive Radio System

Future Internet, 2018
In the field of cognitive radio spectrum sensing, the adaptive silence period management mechanism (ASPM) has improved the problem of the low time-resource utilization rate of the traditional silence period management mechanism (TSPM).
Jingbo Zhang, Zhenyang Sun, Shufang Zhang   +2 more
doaj   +1 more source

Lightweight grape leaf disease recognition method based on transformer framework

Scientific Reports
Grape disease image recognition is an important part of agricultural disease detection. Accurately identifying diseases allows for timely prevention and control at an early stage, which plays a crucial role in reducing yield losses.
Ning Zhang, Enxu Zhang, Guowei Qi, Fei Li, Cheng Lv   +4 more
doaj   +1 more source

Guidelines for Pediatric Radiotherapy Simulation: A Report From the Children's Oncology Group Radiation Oncology Discipline

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Pediatric radiation therapy presents unique challenges compared to adult treatments, including those of immobilization, potential need for sedation, and the critical importance of accurate, reproducible positioning. Additionally, heightened attention to imaging doses is necessary to minimize long‐term toxicity in survivors.
Parham Alaei, Stephen Mihalcik, Sujith Baliga, Young Kwok, Dana Casey, Eric Ehler, Christiane Burton, John C. Breneman, Daphne A. Haas‐Kogan, Suzanne L. Wolden, Arnold C. Paulino, Nadia N. Laack, Natia Esiashvili, Sarah Milgrom, Christine Hill‐Kayser, Thomas J. Fitzgerald, John A. Kalapurakal, Chia‐Ho Hua   +17 more
wiley   +1 more source

An ESG-ConvNeXt network for steel surface defect classification based on hybrid attention mechanism

Scientific Reports
Defect recognition is crucial in steel production and quality control, but performing this detection task accurately presents significant challenges.
Ning Zhang, Ziyang Liu, Enxu Zhang, Yuanqi Chen, Jie Yue   +4 more
doaj   +1 more source

The Relationship Between Physical Activity and Left Ventricular Remodeling in Childhood Cancer Survivors Treated With Anthracyclines: A Cross‐Sectional Study

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Introduction Anthracycline‐related cardiac remodeling precedes heart failure in childhood cancer survivors. The objectives of this study were to determine the relationships between patient‐specific factors, moderate‐to‐vigorous physical activity (MVPA), and cardiac remodeling.
Hari K. Narayan, Sitong Chen, F. Lennie Wong, Nathan Young, Anna Qi, Christopher Davis, Sanjeet Hegde, Nicholas Gloude, Kasey J. Leger, Kelly D. Getz, Francisco Contijoch, Kirsten Ness, Bonnie Ky, Dennis Kuo, Sheri J. Hartman, Saro H. Armenian   +15 more
wiley   +1 more source

IMPROVEMENT OF ENERGY CONSUMPTION IN SPECTRUM SENSING COGNITIVE RADIO NETWORKS USING AN EFFICIENT TWO STAGE SENSING METHOD

Acta Polytechnica, 2017
Cognitive radio (CR) is a wireless technology developed to improve the usage in the spectrum frequency. Energy consumption is considered as a big problem in this technology, especially during a spectrum sensing.
Hikmat Najem Abdullah, Hadeel Sami Abed
doaj   +1 more source

Extremely High Energy Neutrinos and Their Detection [PDF]

The Astrophysical Journal, 1997
We discuss in some detail the production of extremely high energy (EHE) neutrinos with energies above 10^18 eV. The most certain process for producing such neutrinos results from photopion production by EHE cosmic rays in the cosmic background photon field.
Yoshida, Shigeru, Dai, Hongyue, Jui, Charles C. H., Sommers, Paul   +3 more
openaire   +2 more sources