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The Lennard-Jones (LJ) Potential Energy Problem is to construct the most stable form of $N$ atoms of a molecule with the minimal LJ potential energy. This problem has a simple mathematical form $f(x) = 4\sum_{i=1}^N \sum_{j=1,j<i}^N…

Computational Physics · Physics 2011-01-04 Jiapu Zhang

The simplified Lennard-Jones (LJ) potential minimization problem is $f(x)=4\sum_{i=1}^N \sum_{j=1,j<i}^N (\frac{1}{\tau_{ij}^6} -\frac{1}{\tau_{ij}^3}) {subject to} x\in \mathbb{R}^n,$ where $\tau_{ij}=(x_{3i-2}-x_{3j-2})^2…

Optimization and Control · Mathematics 2012-12-12 Jiapu Zhang

X-ray crystallography and nuclear magnetic resonance (NMR) spectroscopy are two powerful tools to determine the protein 3D structure. However, not all proteins can be successfully crystallized, particularly for membrane proteins. Although…

Computational Engineering, Finance, and Science · Computer Science 2019-12-11 Jiapu Zhang

Experimental X-ray crystallography, NMR (Nuclear Magnetic Resonance) spectroscopy, dual polarization interferometry, etc are indeed very powerful tools to determine the 3-Dimensional structure of a protein (including the membrane protein);…

Optimization and Control · Mathematics 2013-01-03 Jiapu Zhang , Yating Hou , Yiju Wang , Changyu Wang , Xiangsun Zhang

In molecular mechanics, current generation potential energy functions provide a reasonably good compromise between accuracy and effectiveness. This paper firstly reviewed several most commonly used classical potential energy functions and…

Optimization and Control · Mathematics 2015-08-19 Jiapu Zhang

X-ray crystallography and nuclear magnetic resonance (NMR) spectroscopy are two powerful tools to determine the protein 3D structure. However, not all proteins can be successfully crystallized, particularly for membrane proteins. Although…

Optimization and Control · Mathematics 2012-12-14 Jiapu Zhang , David D. W. Liu

X-ray crystallography is a powerful tool to determine the protein 3D structure. However, it is time-consuming and expensive, and not all proteins can be successfully crystallized, particularly for membrane proteins. Although nuclear…

Biomolecules · Quantitative Biology 2013-12-10 Jiapu Zhang , Jie Sun , Changzhi Wu

To the best of the author's knowledge, there is little structural data available on the AGAAAAGA palindrome in the hydrophobic region (113-120) of prion proteins due to the unstable, noncrystalline and insoluble nature of the amyloid…

Biological Physics · Physics 2012-12-14 Jiapu Zhang

We study the two dimensional Lennard-Jones energy per particle of lattices and we prove that the minimizer among Bravais lattices with sufficiently large density is triangular and that is not the case for sufficiently small density. We give…

Analysis of PDEs · Mathematics 2014-08-18 Laurent Bétermin , Peng Zhang

Good a-priori bounds on the smallest pairwise distance $r_{\rm{{min}}}(\mbox{LJ}_N^{\rm{gmin}})$ for a three-dimensional (3D) Lennard-Jones $N$-body cluster of globally minimal energy can significantly reduce the computational search space…

Atomic and Molecular Clusters · Physics 2025-11-20 Michael K. -H. Kiessling , David J. Wales

It is well-known that any Lennard-Jones type potential energy must have a periodic ground state given by a triangular lattice in dimension 2. In this paper, we describe a computer-assisted method that rigorously shows such global minimality…

Mathematical Physics · Physics 2023-03-09 Laurent Bétermin

Many experimental studies have shown that the prion AGAAAAGA palindrome hydrophobic region (113-120) has amyloid fibril forming properties and plays an important role in prion diseases. However, due to the unstable, noncrystalline and…

Biomolecules · Quantitative Biology 2013-12-10 Jiapu Zhang , David Y. Gao , Johh Yearwood

The Lennard-Jones 12-6 potential (LJ) is arguably the most widely used pair potential in Molecular Simulations. In fact, it is so popular that the question is rarely asked whether it is fit for purpose. In this paper, we argue that, whilst…

Statistical Mechanics · Physics 2020-06-24 Xipeng Wang , Simòn Ramírez-Hinestrosa , Jure Dobnikar , Daan Frenkel

The reconstruction of low-rank matrix from its noisy observation finds its usage in many applications. It can be reformulated into a constrained nuclear norm minimization problem, where the bound $\eta$ of the constraint is explicitly given…

Optimization and Control · Mathematics 2022-04-14 Kexin Li , Hongwei Li , Raymond H. Chan , You-wei Wen

he segment minimization problem consists of finding the smallest set of integer matrices that sum to a given intensity matrix, such that each summand has only one non-zero value, and the non-zeroes in each row are consecutive. This has…

Data Structures and Algorithms · Computer Science 2011-09-27 Therese Biedl , Stephane Durocher , Holger H. Hoos , Shuang Luan , Jared Saia , Maxwell Young

We consider an $\ell_0$-minimization problem where $f(x) + \gamma \|x\|_0$ is minimized over a polyhedral set and the $\ell_0$-norm regularizer implicitly emphasizes sparsity of the solution. Such a setting captures a range of problems in…

Optimization and Control · Mathematics 2019-12-19 Yue Xie , Uday V. Shanbhag

We present a new theoretical framework for modelling the fusion process of Lennard-Jones (LJ) clusters. Starting from the initial tetrahedral cluster configuration, adding new atoms to the system and absorbing its energy at each step, we…

Atomic and Molecular Clusters · Physics 2009-09-29 Ilia A. Solovyov , Andrey V. Solovyov , Walter Greiner

In this contribution we are concerned with efficient model reduction for multiscale problems arising in lithium-ion battery modeling with spatially resolved porous electrodes. We present new results on the application of the reduced basis…

Numerical Analysis · Mathematics 2019-10-30 Mario Ohlberger , Stephan Rave , Felix Schindler

In this paper, we study minimization problems among Bravais lattices for finite energy per point. We prove that if a function is completely monotonic, then the triangular lattice minimizes energy per particle among Bravais lattices with…

Mathematical Physics · Physics 2015-04-10 Laurent Bétermin

In this paper we consider three minimization problems, namely quadratic, $\rho$-convex and quadratic fractional programing problems. The quadratic problem is considered with quadratic inequality constraints with bounded continuous and…

Optimization and Control · Mathematics 2018-04-09 B. Muraleetharan , S. Selvarajan , S. Srisatkunarajah , K. Thirulogasanthar
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