3,344 research outputs found
Aberrant expression of the glycolytic enzymes aldolase B and type II hexokinase in hepatocellular carcinoma are predictive markers for advanced stage, early recurrence and poor prognosis.
No full textLAI- kvantifikátor pěstebního zásahu =:LAI- quantifier of silvicultural treatment /
No full textThe thesis divided into four research topics dealt with an issue of the relation between silvicultural treatments and an amount of the bearing photosynthetically active assimilation apparatus quantified by leaf area index (LAI) in forest stands of an economically important tree species in the Czech Republic. In pure Norway spruce pole stands at the middle altitudinal zone, an effect of silvicultural treatments on the LAI and an efficiency of the photosynthetically active radiation (PAR; 380-720 nm) by foliage within the photosynthetic uptake was evaluated through both canopy production index (CPI) and leaf area effectivity (LAE), and the highest value of the LAI was achieved in a plot with the highest stand density. However, the highest efficiency of the PAR utilisation (CPI, LAE) was noted in the stand, which was tended by thinning from above. Thus, it was proved that not only the total LAI value but especially an efficacy of the leaf area reflecting sun and shade foliage ratio is the more relevant parameter for an evaluation of the effectivity of the thinning treatment. In a forest regeneration, the LAI can also be used for quantification of the regeneration process stage related to a growth dynamic of the natural regeneration. Besides that the newly developed device LaiPen LP 100 (PSI, ČR) for indirect optical LAI estimation was tested within this study. LAI values measured by LaiPen LP 100 showed almost same accuracy of the measurement and identical trends as world standard (LAI-2200 PCA; LI-COR, NE, USA); both at the stand level and the particular measurement point level. Within the study of the efficacy of the PAR utilisation by foliage in photosynthetic uptake expressed by radiation use efficiency (RUE) in pure, fully-stocked and not defoliated Norway spruce mature stands, it was found that mean air temperature most significantly affect annual and monthly values of the RUE with the significant linear relationship (R2 = 0.19; p < 0.05). In the spruce stands, the significant linear relationship (R2 = 0.85; p < 0.001) between an amount of the sequestrated carbon in the form of atmospheric CO2 molecules and the RUE was also proved. The research topic dealt with a seasonal dynamic of the LAI in selected pure and even-aged European beech and sycamore maple stands revealed findings that a culmination of the LAI is achieved within summer months (DOY 120-140) in the investigated stands. The period is the most suitable for estimation and mutual comparison of the LAI due to the stability of its values in investigated (but also in another deciduous) stands. In studied beech and maple stands, maximum LAI values were noted in the second half of June (DOY 170). General findings of underestimation of LAI values estimated by indirect optical methods compared to direct methods were also confirmed. In the last research topic, an effect of the stand age on the leaf area development was studied in pure, even-aged, and fully-leaved (not defoliated) forest stands of an economically important tree species (Norway spruce, Scots pine, silver fir, Douglas fir, European beech, pedunculate oak, and black walnut). Except for black walnut stands, significant linear relationships proving a decrease of the leaf area with increasing age of the stand were found. The relation between the leaf area expressed by effective plant area index (PAIe) and the age of stands was studied for monitoring of the leaf area dynamic within forest stands with a different age
Adaptive Lp estimation under a general class of error densities
No full textWe consider the problem of Lp estimation of regression coef-
ficients under a general class of error densities. It is known
that both the convergence rate of the Lp estimator and the actual
mode of Lp estimation depend crucially on the choice of p
and the shape of the error density near the origin. We develop
a procedure for choosing p adaptively to yield highly accurate
Lp estimators. It makes use of a special algorithm to automatically
select the right mode of Lp estimation and the m out of n
bootstrap to consistently estimate the log mean squared error of
the Lp estimator. Our proposed adaptive Lp estimator is compared
with other adaptive and non-adaptive Lp estimators in a
simulation study, which confirms superiority of our procedure
Drought (WS) and low phosphorus (LP) stress in groundnut: Water extraction pattern and tolerance related traits for breeding program
Full text linkDrought (WS) and low soil phosphorus (LP) are major constraints
of groundnut productivity. This study aims to (i) understand
the relative importance of phosphorus (P) deficiency, water
stress and their interaction, (ii )investigate water extraction
pattern under WS and LP, and (iii) identify field and controlled
conditions measured traits related to better performance of genotypes
under WS and LP. Six groundnut varieties were assessed
under field and lysimetre conditions. Two water regimes (WW,
WS) and 2 phosphorus treatments (HP, LP) were imposed. Leaf
Area Index (LAI), roots volume (RV), length density (RLD) and
roots dry matter (RDM), water extraction (WEx), transpiration
efficiency (TE), soil moisture content (SMC) and yield were investigated.
LP stress decreased LAI and pod weight (Pwt) (42
and 28 % respectively). ICGV 12991 and 12CS-116 varieties
showed the highest LAI and Pwt. LAI, correlated to Pwt(r2 =
0.77), revealed relevant trait for LP tolerance.LP and WS decreased
roots and canopy measured traits. WS and LP decreased
WEx (51 and 7% respectively). Combined LP and WS (WS-LP)
decreased WEx up to 60%. ICG 12991 and 12CS-116 showed the
highest WEx, RLD and RDM under WS-LP; RLDcould contribute
to water uptake to avoid dehydration. Significant genotypic
variation observed on SMC revealed different pattern of WEx.
TE increased under WS and decreased under LP; factors driving
TE would be different.12CS-116, 55-437 and ICG 12991 revealed
high TEand tolerant to WS-LP but showed different tolerance
mechanism. This study revealed that ICG 12991 and 12CS-116
were tolerant to WS-LP and LAI, RLD, while WEx and TE revealed
relevant traits for groundnut improvement
Ratewise efficient estimation of regression coefficients based on Lp procedures
Full text linkWe consider the problem of estimation of regression coefficients under general classes of error densities without assuming classical regularity conditions. Optimal orders of convergence rates of regression-equivariant estimators are established and shown to be attained in general by Lp estimators based on judicious choices of p. We develop a procedure for choosing p adaptively to yield Lp estimators that converge at approximately optimal rates. The procedure consists of a special algorithm to automatically select the correct mode of Lp estimation and the m out of n bootstrap to consistently estimate the log mean squared error of the Lp estimator. Our proposed adaptive Lp estimator is compared with other adaptive and non-adaptive Lp estimators in a simulation study, that confirms superiority of our procedure.published_or_final_versio
LP Decoding Excess over Symmetric Channels
Full text linkWe consider the problem of Linear Programming (LP) decoding of binary linear codes. The LP excess lemma was introduced by the first author, B. Ghazi, and R. Urbanke (IEEE Trans. Inf. Th., 2014) as a technique to trade crossover probability for 'LP excess' over the Binary Symmetric Channel. We generalize the LP excess lemma to discrete, binary-input, Memoryless, Symmetric and LLR-Bounded (MSB) channels. As an application, we extend a result by the first author and H. Audah (IEEE Trans. Inf. Th., 2015) on the impact of redundant checks on LP decoding to discrete MSB channels. © 2015 IEEE
A Sobolev estimate for radial lp-multipliers on a class of semi-simple lie groups
No full textLet G be a semi-simple Lie group in the Harish-Chandra class with maximal compact subgroup K. Let ΩK be minus the radial Casimir operator. Let 1 4 dim(G/K) < SG < 1 2 dim(G/K), s ∈ (0, SG] and p ∈ (1,∞) be such that(1 p - 1 2 )< s 2SG . Then, there exists a constant CG,s,p > 0 such that for every m ∈ L∞(G) ∩ L2(G) bi-K-invariant with m ∈ Dom(Ωs K) and Ωs K(m) ∈ L2SG/s(G) we have, (0.1) ∥Tm : Lp(G) → Lp( G)∥ ≤ CG,s,p∥Ωs K(m)∥ L2SG/s(G), where Tm is the Fourier multiplier with symbol m acting on the noncommutative Lp-space of the group von Neumann algebra of G. This gives new examples of Lp-Fourier multipliers with decay rates becoming slower when p approximates 2.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Analysi
Stability properties of stochastic maximal Lp-regularity
No full textIn this paper we consider Lp-regularity estimates for solutions to stochastic evolution equations, which is called stochastic maximal Lp-regularity. Our aim is to find a theory which is analogously to Dore’s theory for deterministic evolution equations. He has shown that maximal Lp-regularity is independent of the length of the time interval, implies analyticity and exponential stability of the semigroup, is stable under perturbation and many more properties. We show that the stochastic versions of these results hold
An overview of asymptotic properties of Lp regression under general classes of error distributions
No full textWe survey the asymptotic properties of regression Lp estimators under general classes of error distributions. It is found that the asymptotic distributions of Lp estimators depend crucially on p and the shape of the error distribution near the origin. A number of important features arise as a result, among which are (a) use of a small p may yield accelerated convergence rates for Lp estimators under certain classes of error distributions; (b) for p < 1, Lp regression should, under some circumstances, be undertaken by locally maximizing, rather than minimizing, the sum of the pth powers of the absolute deviations; and (c) consistent estimation of the sampling distributions of the Lp estimators can be achieved by the m out of n bootstrap in general. Numerical examples are provided to illustrate our theoretical findings, and a computational algorithm is suggested for local maximization as may sometimes be required by the Lp procedure. © 2005 American Statistical Association.link_to_subscribed_fulltex
Atrial fibrillation is associated with accumulation of aging-related common type mitochondrial DNA deletion mutation in human atrial tissue.
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