Results 81 to 90 of about 50,977 (262)

Terahertz Communication and Sensing Framework Based on Orthogonal Delay-Doppler Division Multiplexing Modulation

Leida xuebao
Because the Terahertz (THz) band is capable of achieving terabit-per-second communication rates and high-precision sensing, THz Integrated Sensing And Communication (ISAC) has become a key technology for future wireless systems.
Meilin LI, Chong HAN
doaj   +1 more source

The Application Value of Transvaginal Three‐Dimensional Ultrasonography in the Diagnosis of Adenomyosis of the Uterus

Journal of Clinical Ultrasound, EarlyView.
In this study, 3D‐TVS measurements of the uterine junction zone (JZ) in 120 patients showed that a JZmax threshold of ≥ 0.45 cm yielded 77% sensitivity and 89% specificity for adenomyosis diagnosis. Notably, JZ thickness varies minimally with age, demonstrating its stability and excellent diagnostic performance.
Mengyu Li, Zhen Zong, Xiaoman Wang, Hebin Zhang   +3 more
wiley   +1 more source

Vehicle-to-Vehicle Radio Channel Characteristics for Congestion Scenario in Dense Urban Region at 5.9 GHz

International Journal of Antennas and Propagation, 2018
This paper reports the results of a car-following measurement of the wireless propagation channel at 5.9 GHz on a seriously congested urban road in Wuhan, China.
Yishui Shui, Fang Li, Junyi Yu, Wei Chen, Changzhen Li, Kun Yang, Fuxing Chang   +6 more
doaj   +1 more source

Spectrum-Efficient Distributed Compressed Sensing Based Channel Estimation for OFDM Systems Over Doubly Selective Channels

IEEE Access, 2019
In this paper, we deal with channel estimation (CE) for high-mobility orthogonal frequency division multiplexing (OFDM) systems. To make the numerous (unknown) estimation for the high-mobility OFDM systems practicable, the channels are assumed to be time-
Anthony Ngozichukwuka Uwaechia, Nor Muzlifah Mahyuddin   +1 more
doaj   +1 more source

Entanglement-Enhanced Lidars for Simultaneous Range and Velocity Measurements

, 2017
Lidar is a well known optical technology for measuring a target's range and radial velocity. We describe two lidar systems that use entanglement between transmitted signals and retained idlers to obtain significant quantum enhancements in simultaneous ...
Shapiro, Jeffrey H., Zhang, Zheshen, Zhuang, Quntao   +2 more
core   +1 more source

Implementation and Performance of First‐Trimester Referral Ultrasound Scan Following the Introduction of National Guidelines

Journal of Clinical Ultrasound, EarlyView.
The expert assessment of fetal anatomy before 14 weeks is feasible when adopting a standardized protocol and allows an early diagnosis in most cases at risk for fetal anomaly following first trimester screening ultrasound. ABSTRACT Background To report the implementation across Fetal Medicine units and the agreement between first and second trimester ...
Grazia Volpe, Laura Sarno, Elena Mantovani, Daniele Di Mascio, Valentina D'Ambrosio, Tiziana Fanelli, Ilaria Fantasia, Gian Piero Minnella, Paola Quaresima, Enrico Corno, Andrea Dall'Asta, on behalf of the SIEOGiovani Committee of the Italian Society of Ultrasound in Obstetrics and Gynecology (SIEOG)   +11 more
wiley   +1 more source

Transcranial Color‐Coded Duplex Sonography in Large‐Vessel Vasculitis Compatible With Takayasu Arteritis Presenting Intracranial Involvement and Vertebrobasilar Dolichoectasia: A Case Report

Journal of Clinical Ultrasound, EarlyView.
This case illustrates sequential intracranial occlusions in large‐vessel vasculitis compatible with Takayasu arteritis preserving perfusion through robust collateral pathways. Transcranial color‐coded duplex sonography identified characteristic blunted flow patterns and focal turbulence, underscoring its value in detecting hemodynamic compromise beyond
Maria Júnia Lira e Silva, Jordana Gaudie Gurian, Isabella Mesquita Venâncio, Eva Carolina Rocha, Gisele Sampaio Silva   +4 more
wiley   +1 more source

Complaints Involving Sonographers: What Three Decades of Cases From A Public New Zealand Database Can Teach Us

Journal of Medical Radiation Sciences, EarlyView.
Health consumer complaints to the New Zealand Health and Disability Commissioner involving sonographers are rare, totalling 15 in the last 31 years and averaging 1.5 cases per year over the last decade. A large proportion of complaints involve an undetected finding, obstetric examination and private setting.
Martin Necas, Claire Calver, Alex Hill, Danielle Mourits, Sarah Park, Carla Smith   +5 more
wiley   +1 more source

Sparse-Recovery-Based Channel Estimation in Orthogonal Time-Frequency Space Modulation for High-Mobility Scenarios in 5G and Beyond

Journal of Communications Software and Systems
Orthogonal time frequency space (OTFS) modulation is a breakthrough waveform that significantly outperforms conventional modulation schemes in high-mobility scenarios. Unlike traditional approaches that operate in the time-frequency domain, OTFS exploits
Sundaresan Sabapathy, Surendar Maruthu, Deepika Sasi   +2 more
doaj   +1 more source

5D Flow MRI Reveals Respiration‐Driven Changes in Blood Flow Energetics in Congenital Heart Disease

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Hemodynamic monitoring is essential for patients with right‐sided congenital heart disease (CHD). Respiration may have an increased impact on pulmonary flow in these patients that cannot be assessed by standard tools including 4D flow MRI. This study uses 5D flow MRI to assess respiratory‐cycle variations in flow energetics in patients
Thara Nallamothu, Elizabeth K. Weiss, Justin Baraboo, Joshua D. Robinson, Cynthia K. Rigsby, Christopher W. Roy, Matthias Stuber, Michael Markl   +7 more
wiley   +1 more source