Results 51 to 60 of about 90,056 (287)

Vertex-corrected perturbation theory for the electron-phonon problem with non-constant density of states

, 1998
A series of weak-coupling perturbation theories which include the lowest-order vertex corrections are applied to the attractive Holstein model in infinite dimensions.
A. B. Migdal, A. Georges, B. Horvatić, B. Menge, C. S. Owen, E. Müller-Hartmann, E. Müller-Hartmann, G. Baym, G. Baym, G. M. Eliashberg, H. Kajueter, H. R. Krishnamurty, H. Schweitzer, H.-S. Wu, J. Bardeen, J. E. Hirsch, J. Hubbard, J. K. Freericks, J. K. Freericks, J. K. Freericks, J. K. Freericks, J. K. Freericks, J. P. Carbotte, K. Yamada, K. Yamada, K. Yamada, K. Yamada, K. Yosida, K. Yosida, M. Jarrell, M. Jarrell, Mark Jarrell, N. E. Bickers, P. B. Allen, P. B. Allen, P. W. Wolff, T. Holstein, Th. Pruschke, U. Brandt, V. Zlatić, V. Zlatić, V. Zlatić, W. Metzner, W. Metzner, Woonki Chung   +44 more
core   +1 more source

In situ molecular organization and heterogeneity of the Legionella Dot/Icm T4SS

FEBS Letters, EarlyView.
We present a nearly complete in situ model of the Legionella Dot/Icm type IV secretion system, revealing its central secretion channel and identifying new components. Using cryo‐electron tomography with AI‐based modeling, our work highlights the structure, variability, and mechanism of this complex nanomachine, advancing understanding of bacterial ...
Przemysław Dutka, Yuxi Liu, Stefano Maggi, Debnath Ghosal, Jue Wang, Prashant P. Damke, Stephen D. Carter, Wei Zhao, Sukhithasri Vijayrajratnam, Joseph P. Vogel, Carrie L. Shaffer, Grant J. Jensen   +11 more
wiley   +1 more source

Re-iterated approximation methods for nonlinear Volterra integral equations

Mathematical Modelling and Analysis
In this article, the Newton-iteration scheme based upon iterated Galerkin operator is applied for solving non-linear Volterra Urysohn integral equations of the second kind for smooth and weakly singular kernels. A one step of improvement by iteration to
Samiran Chakraborty, Kapil Kant, Ritu Nigam, Gnaneshwar Nelakanti   +3 more
doaj   +1 more source

Asymptotic Behaviors of the Lorenz Curve for Left Truncated and Dependent Data [PDF]

Journal of Sciences, Islamic Republic of Iran, 2012
The purpose of this paper is to provide some asymptotic results for nonparametric estimator of the Lorenz curve and Lorenz process for the case in which data are assumed to be strong mixing subject to random left truncation.
M. Bolbolian Ghalibaf
doaj  

Structural insights into an engineered feruloyl esterase with improved MHET degrading properties

FEBS Letters, EarlyView.
A feruloyl esterase was engineered to mimic key features of MHETase, enhancing the degradation of PET oligomers. Structural and computational analysis reveal how a point mutation stabilizes the active site and reshapes the binding cleft, expading substrate scope.
Panagiota Karampa, Konstantinos Makryniotis, Theofani‐Iosifina Sousani, Evangelos Topakas, Vangelis Daskalakis, Maria Dimarogona   +5 more
wiley   +1 more source

Complex-Valued Multivariate Neural Network (MNN) Approximation by Parameterized Half-Hyperbolic Tangent Function

Mathematics
This paper deals with a family of normalized multivariate neural network (MNN) operators of complex-valued continuous functions for a multivariate context on a box of RN¯, N¯∈N.
Seda Karateke
doaj   +1 more source

Strong limit theorems for a simple random walk on the 2-dimensional comb

, 2009
We study the path behaviour of a simple random walk on the 2-dimensional comb lattice ${\mathbb C}^2$ that is obtained from ${\mathbb Z}^2$ by removing all horizontal edges off the x-axis.
Csaki, E., Csorgo, M., Foldes, A., Revesz, P.   +3 more
core   +1 more source

Iterative Method for Simultaneous Sparse Approximation [PDF]

Scientia Iranica, 2018
This paper studies the problem of Simultaneous Sparse Approximation (SSA). This problem arises in many applications which work with multiple signals maintaining some degree of dependency such as radar and sensor networks. In this paper, we introduce a new method towards joint recovery of several independent sparse signals with the same support.
Sadrizadeh, Sahar, Kiani, Shahrzad, Boloursaz, Mahdi, Marvasti, Farokh   +3 more
openaire   +2 more sources

Chameleon sequences reveal structural effects in proteins representing micelle‐like distribution of hydrophobicity

FEBS Open Bio, EarlyView.
Amino acids sequence of two different proteins with the same sequence (chameleon sequence—black boxes) represent in 3D structure of the proteins different secondary structures: HHHH—helical and BBB—Beta‐structural. The chains folded in water environment adopt different III‐order structures in which the chameleon fragments appear to adopt similar status
Irena Roterman, Katarzyna Stapor, Leszek Konieczny, Krzysztof Gądek, Piotr Nowakowski   +4 more
wiley   +1 more source

Approximation by Overactivated and Spiked Convolutions as Positive Linear Operators

Mathematics
In this work, the author studied the quantitative approximation to the unit operator of three kinds of overactivated and spiked convolution type-operators.
George A. Anastassiou
doaj   +1 more source