Results 151 to 160 of about 73,082 (280)

Complex manifolds and Einstein’s equations

open access: yes, 1982
We present a generalization of Penrose’s twistor theory based on the geometry of rational curves in complex manifolds. The analytical counterpart of this complex geometry consists, in the three simplest cases, of a system of differential equations closely connected with Einstein’s equations.
openaire   +3 more sources

Stochastic Hydrodynamic Velocity Field and the Representation of Langevin Equations

open access: yesAnnalen der Physik, Volume 537, Issue 6, June 2025.
A lumped method is proposed to account for both mean‐field hydrodynamics and stochastic fluctuations within the kinematic equations of motion, providing a regularized formulation of the overdamped approximation. The concept of stochastic realizability in broad sense is introduced based on the spectral properties of the Fredholm operator associated with
Massimiliano Giona   +2 more
wiley   +1 more source

A Benchmark, Expand, and Calibration (BenchExCal) Trial Emulation Approach for Using Real‐World Evidence to Support Indication Expansions: Design and Process for a Planned Empirical Evaluation

open access: yesClinical Pharmacology &Therapeutics, Volume 117, Issue 6, Page 1820-1828, June 2025.
Real‐world evidence involving healthcare database studies is well established for making causal inferences in post‐market drug safety studies and methods, data, and research infrastructure for evaluating effectiveness have advanced in recent years. The rapidly expanding field of etiologic research using insurance claims and electronic health records ...
Shirley V. Wang   +6 more
wiley   +1 more source

There are no proper Berwald--Einstein manifolds [PDF]

open access: yesPublicationes Mathematicae Debrecen, 2015
Deng, Shaoqiang   +2 more
openaire   +2 more sources

The Diagnostic Value of Plasma Small Extracellular Vesicle‐Derived CAIX Protein in Prostate Cancer and Clinically Significant Prostate Cancer: A Study on Predictive Models

open access: yesThe Prostate, Volume 85, Issue 8, Page 723-741, June 2025.
ABSTRACT Background Current diagnostic tools are inaccurate and not specific to prostate cancer (PCa) diagnosis. Cancer‐derived small extracellular vehicles (sEVs) play a key role in intercellular communication. In this study, we examined the diagnostic value of plasma sEV‐derived carbonic anhydrase IX (CAIX) protein for PCa and clinically significant ...
Haotian Chen   +11 more
wiley   +1 more source

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