Results 41 to 50 of about 765,120 (288)

Action principle for Numerical Relativity evolution systems

, 2010
A Lagrangian density is provided, that allows to recover the Z4 evolution system from an action principle. The resulting system is then strongly hyperbolic when supplemented by gauge conditions like '1+log' or 'freezing shift', suitable for numerical ...
Bona, C., Bona-Casas, C., Palenzuela, C.
core   +1 more source

Psychological Safety Among Interprofessional Pediatric Oncology Teams in Germany: A Nationwide Survey

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Psychological safety (PS) is essential for teamwork, communication, and patient safety in complex healthcare environments. In pediatric oncology, interprofessional collaboration occurs under high emotional and organizational demands. Low PS may increase stress, burnout, and adverse events.
Alexandros Rahn, Anna‐Lena Herbach, Christian Bock, Katharina Fleig, Urs Mücke   +4 more
wiley   +1 more source

Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM

FEBS Letters, EarlyView.
Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley   +1 more source

Integrated Guidance and Control for Strap-Down Flight Vehicle: A Deep Reinforcement Learning Approach

Aerospace
This paper proposes a three-dimensional (3D) deep reinforcement learning-based integrated guidance and control (DRLIGC) method, which is restricted by the narrow field-of-view (FOV) constraint of the strap-down seeker.
Qinglong Zhang, Bin Zhao, Yifu Jiang, Jingyan Zhang, Jiale Zhang   +4 more
doaj   +1 more source

Quantization of static space-times

, 2002
A 4-dimensional Lorentzian static space-time is equivalent to 3-dimensional Euclidean gravity coupled to a massless Klein-field. By canonically quantizing the coupling model in the framework of loop quantum gravity, we obtain a quantum theory which ...
A. Ashtekar, A. Ashtekar, A. Ashtekar, A. Ashtekar, A. Ashtekar, A. Ashtekar, A. Ashtekar, A. Ashtekar, A. Corichi, A. Perez, C. Di Bartolo, C. Rovelli, C. Rovelli, C. Rovelli, C. Rovelli, G. Immirzi, J. Samuel, J.D. Romano, M. Bojowald, R. DePietri, R. Geroch, S.W. Hawking, T. Thiemann, T. Thiemann, T. Thiemann, T. Thiemann, T. Thiemann, T. Thiemann, Y. Ma, Y. Ma, Yongge Ma   +30 more
core   +1 more source

Mapping the evolution of mitochondrial complex I through structural variation

FEBS Letters, EarlyView.
Respiratory complex I (CI) is crucial for bioenergetic metabolism in many prokaryotes and eukaryotes. It is composed of a conserved set of core subunits and additional accessory subunits that vary depending on the organism. Here, we categorize CI subunits from available structures to map the evolution of CI across eukaryotes. Respiratory complex I (CI)
Dong‐Woo Shin, Tingting Chen, James A. Letts   +2 more
wiley   +1 more source

Optimization Design of Indoor Substation Ventilation and Noise Reduction Based on Deep Reinforcement Learning

Zhongguo dianli, 2023
In view of the equipment safety problems caused by the high operation temperature of the indoor substations and the disturbing noise problems caused by relevant heat dissipation measures, this paper proposes a method for optimizing the design parameters ...
Jinhui TANG, Fayuan WU, Yanli ZHI, Mengting MAO, Xiaomin DAI   +4 more
doaj   +1 more source

A New Solution of The Cosmological Constant Problems

, 2011
We extend the usual gravitational action principle by promoting the bare cosmological constant (CC) from a parameter to a field which can take many possible values.
Douglas J. Shaw, G. Efstathiou, J. D. Barrow, John D. Barrow   +3 more
core   +1 more source

Molecular bases of circadian magnesium rhythms across eukaryotes

FEBS Letters, EarlyView.
Circadian rhythms in intracellular [Mg2+] exist across eukaryotic kingdoms. Central roles for Mg2+ in metabolism suggest that Mg2+ rhythms could regulate daily cellular energy and metabolism. In this Perspective paper, we propose that ancestral prokaryotic transport proteins could be responsible for mediating Mg2+ rhythms and posit a feedback model ...
Helen K. Feord, Gerben van Ooijen
wiley   +1 more source

Nonsingular Sliding Mode Guidance Law for Impact Time Control With Field-of-View Constraint

IEEE Access
In this paper, a new missile impact time control guidance law using sliding mode control technology is proposed, aiming at intercepting stationary targets.
Lei Zhang, Wenjun Yi, Jun Guan
doaj   +1 more source