Results 71 to 80 of about 56,216 (265)

BLACK-HOLE SOLUTION WITHOUT CURVATURE SINGULARITY [PDF]

Modern Physics Letters A, 2013
An exact solution of the vacuum Einstein field equations over a nonsimply-connected manifold is presented. This solution is spherically symmetric and has no curvature singularity. It can be considered as a regularization of the Schwarzschild solution over a simply-connected manifold, which has a curvature singularity at the center.
openaire   +3 more sources

Rethinking plastic waste: innovations in enzymatic breakdown of oil‐based polyesters and bioplastics

FEBS Open Bio, EarlyView.
Plastic pollution remains a critical environmental challenge, and current mechanical and chemical recycling methods are insufficient to achieve a fully circular economy. This review highlights recent breakthroughs in the enzymatic depolymerization of both oil‐derived polyesters and bioplastics, including high‐throughput protein engineering, de novo ...
Elena Rosini, Nicolò Antonelli, Gianluca Molla   +2 more
wiley   +1 more source

On Solution of Regular Singular Ordinary Boundary Value Problem

Ibn Al-Haitham Journal for Pure and Applied Sciences, 2017
 This paper devoted to the analysis of regular singular boundary value problems for ordinary differential equations with a singularity of the different kind , we propose semi - analytic technique using two point osculatory interpolation to construct ...
Luma. N. M. Tawfiq, Heba. W. Rasheed
doaj  

Periodic Solutions for Singular Conservative Systems

Journal of Mathematical Analysis and Applications, 1994
The author looks for periodic solutions of the system \((*)\) \(\ddot q+ V' (q)= 0\), where \(q\in \mathbb{R}^N\) and \(V(x)\to -\infty\) as \(x\to 0\). This problem has been examined in the literature from two different points of view: a) given \(T>0\), one seeks for solutions of \((*)\) having \(T\) as a period; b) given \(h\in R\), one seeks for ...
openaire   +2 more sources

Pathogenic Neurofibromatosis type 1 gene variants in tumors of non‐NF1 patients and role of R1276

FEBS Open Bio, EarlyView.
Somatic variants of the neurofibromatosis type 1 (NF1) gene occur across neoplasms without clinical manifestation of the disease NF1. We identified emerging somatic pathogenic NF1 variants and hotspots, for example, at the arginine finger 1276. Those missense variants provide fundamental information about neurofibromin's role in cancer.
Mareike Selig, Swanhild Lohse, Sara Elahi, Nils Hartmann, Stefanie Deckert, Shutian Si, Alexander Desuki, Anja Harder   +7 more
wiley   +1 more source

On Solution of Regular Singular Initial Value Problems

Ibn Al-Haitham Journal for Pure and Applied Sciences, 2017
    This paper devoted to the analysis of regular singular initial value problems for ordinary differential equations with a singularity of the first kind , we propose semi - analytic technique using two point osculatory interpolation to construct ...
Luma. N. M. Tawfiq, Reem. W. Hussein
doaj  

An efficient spectral method for nonlinear Volterra integro-differential equations with weakly singular kernels

Mathematical Modelling and Analysis
For Volterra integro-differential equations (VIDEs) with weakly singular kernels, their solutions are singular at the initial time. This property brings a great challenge to traditional numerical methods. Here, we investigate the numerical approximation
ZhiPeng Liu, DongYa Tao, Chao Zhang
doaj   +1 more source

The Periodic Solutions of the Compound Singular Fractional Differential System with Delay

International Journal of Differential Equations, 2010
The paper gives sufficient conditions on the existence of periodic solution for a class of compound singular fractional differential systems with delay, involving Nishimoto fractional derivative.
XuTing Wei, XuanZhu Lu
doaj   +1 more source

Application of the Brouwer and the Kakutani fixed-point theorems to a discrete equation with a double singular structure

Fixed Point Theory and Applications, 2018
Applying the method consisting of a combination of the Brouwer and the Kakutani fixed-point theorems to a discrete equation with a double singular structure, that is, to a discrete singular equation of which the denominator contains another discrete ...
Minoru Tabata, Nobuoki Eshima
doaj   +1 more source

Enzymatic degradation of biopolymers in amorphous and molten states: mechanisms and applications

FEBS Open Bio, EarlyView.
This review explains how polymer morphology and thermal state shape enzymatic degradation pathways, comparing amorphous and molten biopolymer structures. By integrating structure–reactivity principles with insights from thermodynamics and enzyme engineering, it highlights mechanisms that enable efficient polymer breakdown.
Anđela Pustak, Aleksandra Maršavelski
wiley   +1 more source