Results 31 to 40 of about 2,238,481 (242)

Truss optimization with natural frequency constraints using generalized normal distribution optimization [PDF]

, 2022
The newly proposed Generalized Normal Distribution Optimization (GNDO) algorithm is used to design the truss structures with optimal weight. All trusses optimized have frequency constraints, which make them very challenging optimization problems. A large
Mirjalili, S, Khodadadi, N
core   +1 more source

Separation and Extraction of Compound-Fault Signal Based on Multi-Constraint Non-Negative Matrix Factorization

Entropy
To solve the separation of multi-source signals and detect their features from a single channel, a signal separation method using multi-constraint non-negative matrix factorization (NMF) is proposed.
Mengyang Wang, Wenbao Zhang, Mingzhen Shao, Guang Wang   +3 more
doaj   +1 more source

APMEG: Quadratic Time–Frequency Distribution Analysis of Energy Concentration Features for Unveiling Reliable Diagnostic Precursors in Global Major Earthquakes Towards Short-Term Prediction

Applied Sciences
Earthquake prediction remains a significant challenge in seismology, and advancements in signal processing techniques have opened new avenues for improving prediction accuracy. This paper explores the application of Time–Frequency Distributions (TFDs) to
Fabian Lee, Shaiful Hashim, Noor’ain Kamsani, Fakhrul Rokhani, Norhisam Misron   +4 more
doaj   +1 more source

Health‐Related Social Needs in Children With Sickle Cell Disease Are Associated With Worse Health‐Related Quality of Life

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Children with sickle cell disease (SCD) face multiple acute and chronic medical complications that may impact their quality of life as reported by patients themselves. Health‐related social needs (HRSNs), such as food and housing insecurity, are common in people with SCD, but the association between HRSNs and patient‐reported ...
Sarah J. Marks, Molly Sonenklar, Cerelia Donald, Cecelia Valrie, Wally Smith, India Sisler   +5 more
wiley   +1 more source

Exact BER Analysis of OFDM Systems Communicating over Frequency-Selective Fading Channels Subjected to Carrier Frequency Offset [PDF]

, 2007
Orthogonal Frequency Division Multiplexing (OFDM) has been employed in numerous wireless standards. However, the performance of OFDM systems is degraded by both the Carrier Frequency Offset (CFO) and the Phase Estimation Error (PER).
Liu, X., Hanzo, L., Lajos Hanzo, Xiang Liu   +3 more
core   +1 more source

Time and frequency laboratory activities at RISE [PDF]

, 2020
RISE Research Institutes of Sweden is since 2018 the result of a rebranding of SP Technical Research Institute of Sweden and several other national research facilities and test beds in Sweden.
Jarlemark, Per,, Jaldehag, Kenneth,, Ebenhag, Sven-Christian,, Rieck, Carsten,, Hedekvist, Per Olof,   +4 more
core   +1 more source

The Boulder Population of Asteroid 4 Vesta: Size‐Frequency Distribution and Survival Time

Earth and Space Science, 2021
Dawn's framing camera observed boulders on the surface of Vesta when the spacecraftwas in its lowest orbit (Low Altitude Mapping Orbit, LAMO). We identified, measured, and mapped boulders in LAMO images, which have a scale of 20 m per pixel.
Stefan E. Schröder, Uri Carsenty, Ernst Hauber, Franziska Schulzeck, Carol A. Raymond, Christopher T. Russell   +5 more
doaj   +1 more source

The Combined Effect of Obesity and Contraceptive Use on Pulmonary Embolism in Adolescent Females Residing in the United States

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Combined oral contraceptive (COC) use in obese adult women dramatically increases the relative risk of developing a pulmonary embolism (PE). The risk of a PE in obese adolescent females taking contraceptives is currently unknown. The purpose of this investigation was to determine the effect of body mass index (BMI) and contraceptive
John Puetz, Joanne Salas
wiley   +1 more source

A Discrete Time and Frequency Wigner Distribution: Properities and Implementation [PDF]

, 2005
Time-frequency distributions are used in the analysis and processing of nonstationary signals. The Wigner-Ville distribution (WVD) is a fundamental time-frequency distribution uniquely satisfying many desirable mathematical properties. The realisation of
Boashash, Boualem, O'Toole, John, Mesbah, Mostefa   +2 more
core  

Interpretable Evaluation of Sparse Time–Frequency Distributions: 2D Metric Based on Instantaneous Frequency and Group Delay Analysis

Mathematics
Compressive sensing in the ambiguity domain offers an efficient method for reconstructing high-quality time–frequency distributions (TFDs) across diverse signals.
Vedran Jurdana
doaj   +1 more source