Results 91 to 100 of about 9,436,750 (310)
Short-time Fourier transform with the window size fixed in the frequency domain
Digit. Signal Process., 2017 The Short-Time Fourier Transform (STFT) is widely used to convert signals from the time domain into a time–frequency representation. This representation has well known limitations regarding time–frequency resolution.
C. Mateo, J. Talavera
semanticscholar +1 more source
Dizhen xuebao全波形反演是一种利用地震波传播的动力学特征来获取地下介质物性参数的反演方法，可为揭示地下精细结构提供重要依据。本文以弹性波方程作为数学模型来模拟地震波传播规律并进行相应的反演方法研究。为提高计算效率与反演结果的准确性，可将近似解析离散化（NAD）算子用于频率域弹性波方程的正演模拟。本文在频率域NAD离散的基础上推导阻抗矩阵的稀疏分块结构与反演目标函数对模型参数的梯度计算公式，由此建立基于NAD算子的频率域弹性波全波形反演方法。为验证该方法的有效性，文中通过数值实验对多种典型介质模型进行反演计算 ...
Xiaoting Yang, Ning Wang, Chao Lang
doaj +1 more source
Structural insights and therapeutic targets in Acinetobacter baumannii capsule biosynthesis
FEBS Letters, EarlyView.Hypervirulent KL49 A. baumannii's capsular polysaccharide contains the nonulosonic acid 8‐epi‐Leg5,7Ac2, synthesized by epimerization via ElaA, ElaB, and ElaC. Crystal structures of ElaA, ElaB, and ElaC reveal their role in CMP‐Leg5,7Ac2 synthesis and regioselective C8 epimerization.
Woo Cheol Lee +7 more
wiley +1 more source
Frequency Domain Diagnostics of Transformer Insulation
Приборы и методы измерений, 2019 The first part of paper deals with the base information about diagnostics of power transformers. In this part are presented differently insulating methods, for example method of recovery voltage method, method of polarization and depolarization currents ...
M. Gutten +6 more
doaj +1 more source
α‐Synuclein aggregation landscape from phase separation to neurotoxic intermediates
FEBS Letters, EarlyView.Alpha‐synuclein aggregation in Parkinson's disease involves a complex landscape of transient intermediates, including oligomers, fibrils and liquid–liquid phase separation (LLPS). A view is emerging in which LLPS maturation into solid‐like condensates may contribute to the formation of neurotoxic species.
Silvia Arino +2 more
wiley +1 more source
Estimating the Taylor rule in the time-frequency domain
Journal of macroeconomics, 2018 We assess U.S. monetary policy across time and frequencies in the framework of the Taylor Rule (TR). With that purpose, we derive a multivariate generalization of the wavelet gain ? the partial wavelet gain ? a new tool which allows us, for the ?rst time,
Luís Aguiar-Conraria +2 more
semanticscholar +1 more source
Adaptive SVD Denoising in Time Domain and Frequency Domain
Applied SciencesIn seismic data processing, noise not only affects velocity analysis and seismic migration, but also causes potential risks in post-stack processing because of the artifacts.
Meixuan Ren +5 more
doaj +1 more source
FEBS Letters, EarlyView.Inositol pyrophosphates are energy‐rich signaling molecules that perform critical functions in cells. Three different families of phosphatases hydrolyze the β phosphate of the inositol pyrophosphate molecules: two have narrow specificities and one is promiscuous.
Ronda J. Rolfes
wiley +1 more source
DSGE Models in the Frequency Domain [PDF]
SSRN Electronic Journal, 2012 We exploit well-known features of the frequency domain to estimate a medium-scale DSGE model on different frequency bands. We study whether fit, parameter estimates and forecasting performance depend on the frequency band over which the model is estimated.
openaire +1 more source
Reconstructing enzyme evolution by protein engineering
FEBS Letters, EarlyView.Natural enzyme evolution can be retraced by protein engineering methods such as directed evolution, rational design, and ancestral sequence reconstruction. These approaches reveal how enzymes emerged from ligand‐binding scaffolds, developed varying substrate preferences, formed oligomeric complexes, adapted to environmental changes, and evolved novel ...
Lukas Drexler +2 more
wiley +1 more source