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Creators/Authors contains: "Nguyen, Ngoc"

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  1. ; ; ; ; ; ; ; ; ; ; et al (, Science)
    The efflux of carbon dioxide (CO2) from woody stems, a proxy for stem respiration, is a critical carbon flux from ecosystems to the atmosphere, which increases with temperature on short timescales. However, plants acclimate their respiratory response to temperature on longer timescales, potentially weakening the carbon-climate feedback. The magnitude of this acclimation is uncertain despite its importance for predicting future climate change. We develop an optimality-based theory dynamically linking stem respiration with leaf water supply to predict its thermal acclimation. We show that the theory accurately reproduces observations of spatial and seasonal change. We estimate the global value for current annual stem CO2efflux as 27.4 ± 5.9 PgC. By 2100, incorporating thermal acclimation reduces projected stem respiration without considering acclimation by 24 to 46%, thus reducing land ecosystem carbon emissions. 
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    Free, publicly-accessible full text available May 29, 2026
  2. ; ; (, Optimization)
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  3. ; ; (, Israel Journal of Mathematics)
    Abstract Letk(B0) andl(B0) respectively denote the number of ordinary andp-Brauer irreducible characters in the principal blockB0of a finite groupG. We prove that, ifk(B0)−l(B0) = 1, thenl(B0) ≥p− 1 or elsep= 11 andl(B0) = 9. This follows from a more general result that for every finite groupGin which all non-trivialp-elements are conjugate,l(B0) ≥p− 1 or elsep= 11 and$$G/{{\bf{O}}_{{p^\prime }}}(G) \cong C_{11}^2\, \rtimes\,{\rm{SL}}(2,5)$$ G / O p ′ ( G ) ≅ C 11 2 ⋊ SL ( 2 , 5 ) . These results are useful in the study of principal blocks with few characters. We propose that, in every finite groupGof order divisible byp, the number of irreducible Brauer characters in the principalp-block ofGis always at least$$2\sqrt {p - 1} + 1 - {k_p}(G)$$ 2 p − 1 + 1 − k p ( G ) , wherekp(G) is the number of conjugacy classes ofp-elements ofG. This indeed is a consequence of the celebrated Alperin weight conjecture and known results on bounding the number ofp-regular classes in finite groups. 
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  4. ; ; ; ; ; ; ; ; ; (, Developmental Biology)
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  5. ; ; ; ; ; (, IEEE International Conference on Data Mining)
    Accepted Manuscript Full Text Available
  6. ; ; ; (, Journal of Optimization Theory and Applications)
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  7. ; (, European Journal of Mathematics)
    We completely describe all the possible fields of values of irreducible characters of degree up to 3 of finite groups. The obtained result points toward a rather surprising connection between the field of values and the degree of an arbitrary irreducible character. 
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  8. ; ; ; ; ; (, Hydrobiologia)
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  9. ; ; (, Journal of Algebra)
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  10. ; (, Algebra & Number Theory)
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