Results 71 to 80 of about 772 (186)

Epilepsy: Epidemiology, Molecular Pathogenesis, and Clinical Management

MedComm, Volume 7, Issue 7, July 2026.
Epilepsy is a heterogeneous and chronically evolving brain network disorder. This review integrates epidemiological burden, psychiatric comorbidities, and cyclic seizure patterns with multiscale pathogenic mechanisms, including ion‐channel dysfunction, synaptic transmission defects, neuroinflammation, metabolic and mitochondrial dysfunction, and ...
Jian Liu, Xinyan Wu, Ting Yin, Feining Huang, Manqi Kong, Yu Yang, Zinan Liu, Jiabin Yu, Tianpeng Zhang   +8 more
wiley   +1 more source

Early and Progressive Spinal Cord Atrophy in Spinocerebellar Ataxia Type 1

Movement Disorders, Volume 41, Issue 7, Page 1836-1846, July 2026.
Abstract Background Spinocerebellar ataxia type 1 (SCA1) is a rare, autosomal dominant neurodegenerative disorder characterized by progressive cerebellar and brainstem degeneration. Previous studies have shown that spinal cord atrophy is also a key aspect of SCA1 neuropathology.
Colette J.M. Reniers, Teije H. van Prooije, Kirsten C.J. Kapteijns, Jack J.A. van Asten, Caterina Mariotti, Lidia Sarro, Anna Nigri, Marina Grisoli, Giulia Coarelli, Alexandra Durr, Tom Scheenen, Bart van de Warrenburg   +11 more
wiley   +1 more source

Considerations for the Design of Sinusoidal Slug Testing Methods

Groundwater, Volume 64, Issue 4, Page 498-506, July/August 2026.
Periodic hydraulic tests estimate aquifer properties using controlled groundwater‐level oscillations. Evaluating two sinusoidal slug‐test designs shows large motion errors when transfer‐link and flywheel ratios are high or variable. Rotating‐drive mechanisms are therefore suboptimal; stepper‐motor winches generate more accurate sinusoidal motion ...
Chris Turnadge, Lawrence Burk, Eddie W. Banks   +2 more
wiley   +1 more source

Influence of Waveform Characteristics on LiDAR Ranging Accuracy and Precision

Sensors, 2018
Time of flight (TOF) based light detection and ranging (LiDAR) is a technology for calculating distance between start/stop signals of time of flight. In lab-built LiDAR, two ranging systems for measuring flying time between start/stop signals include ...
Xiaolu Li, Bingwei Yang, Xinhao Xie, Duan Li, Lijun Xu   +4 more
doaj   +1 more source

Design and Validation of a Long-Range Streak-Tube Imaging Lidar System with High Ranging Accuracy

Applied Sciences
The Streak-Tube Imaging Lidar (STIL) has been widely used in high-precision measurement systems due to its ability to capture detailed spatial and temporal information.
Chaowei Dong, Zhaodong Chen, Zhigang Fan, Xing Wang, Lansong Cao, Pengfei Hao, Zhiwei Dong, Rongwei Fan, Deying Chen   +8 more
doaj   +1 more source

2D Vernier žiedinio laikinio skaitmeninio keitiklio modelis / The model of 2D Vernier time to digital converter based on gated ring oscillators

Mokslas: Lietuvos Ateitis, 2018
In this paper, the model of 2D Vernier time to digital converter (TDC) based on gated ring oscillators, which is implemented using VHDL hardware description language, is presented.
Marijan Jurgo, Romualdas Navickas
doaj   +1 more source

A DTC-Based Snapshot ADPLL With Feedforward Fractional Spur Cancellation and Asynchronous Duty-Modulation Dithering DCO Achieving–71.6 dBc Fractional Spur in 65-nm CMOS Process

IEEE Access
This paper presents a DTC-based snapshot all-digital phase-locked loop (ADPLL) that achieves robust fractional spur suppression and low phase noise with compact circuit implementation.
Kihoon Kwon, Sangwon Kim, Minseo Park, Jinhyuk Ahn, Gahyeon Lee, Joonho Gil, Chulhyun Park, Yunseong Eo, Hyungkyu Choi, Chulho Kang, Eun-Seong Kim, Nam-Young Kim, Ramesh Harjani, Taehyoun Oh   +13 more
doaj   +1 more source

A 3.5 to 4.7-GHz Fractional-N ADPLL With a Low-Power Time-Interleaved GRO-TDC of 6.2-ps Resolution in 65-nm CMOS Process

IEEE Access
This paper proposes a low-power design method and a low-noise phase offset calibration technique for a gated ring-oscillator time-to-digital converter (GRO-TDC), which normally consumes a large percentage of most all-digital phase-locked loop (ADPLL ...
Kyoung-Ub Cho, Joonho Gil, Chulhyun Park, Kyu-Jin Cho, Jae-Woo Shin, Eun-Seong Kim, Yun-Seong Eo, Ramesh Harjani, Nam-Young Kim, Taehyoun Oh   +9 more
doaj   +1 more source

A Background Jitter Calibration for ADCs Using TDC Phase Information From ADPLL

IEEE Access
The phase noise, commonly known as jitter, in Phase-Locked Loops (PLLs) is conventionally perceived as a stochastic process, necessitating a degree of tolerance in downstream circuits such as Analog-to-Digital Converters (ADCs). This paper addresses this
Haoyang Shen, Hao Zheng, Daniel O'Hare, Deepu John, Barry Cardiff   +4 more
doaj   +1 more source

High-Performance Time-to-Digital Conversion on a 16-nm Ultrascale+ FPGA

IEEE Access
In recent years, field-programmable gate arrays (FPGAs) have emerged as promising platforms for implementing picosecond-resolution time-to-digital converters (TDCs).
Lorenzo Castelvero, Ignacio H. Lopez Grande, Valerio Pruneri   +2 more
doaj   +1 more source