Results 111 to 120 of about 3,140,596 (304)

Attitude control compensator for flexible spacecraft [PDF]

, 1991
An attitude control loop for a spacecraft uses a proportional-integral-derivative (PID) controller for control about an axis. The spacecraft body has at least a primary mechanical resonance.
Goodzeit, Neil E., Linder, David M.
core   +1 more source

Time after time – circadian clocks through the lens of oscillator theory

FEBS Letters, EarlyView.
Oscillator theory bridges physics and circadian biology. Damped oscillators require external drivers, while limit cycles emerge from delayed feedback and nonlinearities. Coupling enables tissue‐level coherence, and entrainment aligns internal clocks with environmental cues.
Marta del Olmo, Carolin Ector, Hanspeter Herzel   +2 more
wiley   +1 more source

Multiple ETS family transcription factors bind mutant p53 via distinct interaction regions

FEBS Letters, EarlyView.
Mutant p53 gain‐of‐function is thought to be mediated by interaction with other transcription factors. We identify multiple ETS transcription factors that can bind mutant p53 and found that this interaction can be promoted by a PXXPP motif. ETS proteins that strongly bound mutant p53 were upregulated in ovarian cancer compared to ETS proteins that ...
Stephanie A. Metcalf, Nicholas F. Downing, Kaitlyn M. Mills, Samuel C. Metcalfe, Alexander E. Kritzer, Lindsey D. Mayo, Peter C. Hollenhorst   +6 more
wiley   +1 more source

Frequency measurement point selection and regional primary frequency regulation capability assessment in high-penetration renewable energy power systems

Zhejiang dianli
The increasing integration of renewable energy sources replacing conventional synchronous generators in power systems has led to weakened system inertia support and reduced primary frequency regulation capability， with growing spatiotemporal dispersion ...
LI Dongdong, YAO Zhenfei, YAO Yin, XU Bo, YANG Fan, ZHAI Haibao, GAO Wenzhong   +6 more
doaj   +1 more source

Vibration Identification of Folded-MEMS Comb Drive Resonators

Micromachines, 2018
Natural frequency and frequency response are two important indicators for the performances of resonant microelectromechanical systems (MEMS) devices.
Jianxin Han, Lei Li, Gang Jin, Jingjing Feng, Baizhou Li, Haili Jia, Wenkui Ma   +6 more
doaj   +1 more source

The newfound relationship between extrachromosomal DNAs and excised signal circles

FEBS Letters, EarlyView.
Extrachromosomal DNAs (ecDNAs) contribute to the progression of many human cancers. In addition, circular DNA by‐products of V(D)J recombination, excised signal circles (ESCs), have roles in cancer progression but have largely been overlooked. In this Review, we explore the roles of ecDNAs and ESCs in cancer development, and highlight why these ...
Dylan Casey, Zeqian Gao, Joan Boyes
wiley   +1 more source

Conserved structural motifs in PAS, LOV, and CRY proteins regulate circadian rhythms and are therapeutic targets

FEBS Letters, EarlyView.
Cryptochrome and PAS/LOV proteins play intricate roles in circadian clocks where they act as both sensors and mediators of protein–protein interactions. Their ubiquitous presence in signaling networks has positioned them as targets for small‐molecule therapeutics. This review provides a structural introduction to these protein families.
Eric D. Brinckman, Anna E. Lester, Brian D. Zoltowski   +2 more
wiley   +1 more source

Optimization of Reserve Capacity for New Energy Participating in Primary Frequency Regulation of the Power System

Energies
The frequency regulation problem of the power system under the scenario of a high proportion of new energy access has attracted attention. It has become an important technical means for new energy to reserve a certain amount to participate in system ...
Yichao Jia, Ning Chen, Lei Zhang, Minhui Qian, Bingjie Tang, Yanzhang Liu, Chang Zhou, Peipei Peng   +7 more
doaj   +1 more source

Evaluation of the Autoparametric Pendulum Vibration Absorber for a Duffing System

Shock and Vibration, 2008
In this work we study the frequency and dynamic response of a damped Duffing system attached to a parametrically excited pendulum vibration absorber. The multiple scales method is applied to get the autoparametric resonance conditions and the results are
Benjamın Vazquez-Gonzalez, Gerardo Silva-Navarro   +1 more
doaj   +1 more source

The matrix exponential in transient structural analysis [PDF]

The primary usefulness of the presented theory is in the ability to represent the effects of high frequency linear response with accuracy, without requiring very small time steps in the analysis of dynamic response.
Minnetyan, Levon
core   +1 more source