This paper is concerned with the nonlinear functional difference equation ∆x(n) = −a(n)x(n) + λh(n)f(n, x(n− τ(n))), where h and f may change sign. Sufficient conditions for the existence of at least one positive T−periodic solution are established.

Note that the constraints can only be satisfied if both √ λG − zr and √ 1− λH − zs have only non-negative entries and z ≤ 0. In this case the ∗Felix Bernstein Institute for Mathematical Statistics in the Biosciences and Institute for Mathematical Stochastics, University of Göttingen, Goldschmidtstraße 7, 37077 Göttingen †Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, 37077 Götti...

Our several recent improvements of the current textbook (so called Rayleigh-Schrödinger) perturbative representation of bound states are reviewed. They were all inspired by an adaptive re-split H(λ) = H + λH of the Hamiltonian. Their feasibility is facilitated by the use of nonstandard bases and by the flexibility of normalization of the wave functions ψ(λ).

Herein, we report the structural, electronic, and charge transfer properties of N-[5′-methyl-3′-isoxasolyl]-N-[(E)-1-(-2-thiophene)] methylidene] amine (L) its Fe2+, Co2+, Ni2+, Cu2+, Zn2+ complexes (dubbed A, B, C, D, E, respectively) using density functional theory (DFT). All molecules investigated were optimized at BP86/def2-TZVP/RI level theory. Single point energy calculations carried out ...

We prove that given any smooth metric γ and smooth positive function H on S, there is a constant λ > 0, depending on (γ,H), and an asymptotically flat solution (M, g, u) of the static vacuum Einstein equations on M = R \ B, such that the induced metric and mean curvature of (M, g, u) at ∂M are given by (γ, λH). This gives a partial resolution of a conjecture of Bartnik.

We propose to to study the production of various strange particles and strange nuclear systems using photoand electro-production at zero degrees in combination with a very forward angle particle trigger. The new feature of this LOI is that a kaon trigger is implemented for kaons produced at angles le15 degrees. In addition, for electroproduction processes the the scattered electrons are also de...

An SU(3) symmetric model with high predictivity for octet meson (π,K) quark fragmentation functions with a simple approach to SU(3) symmetry breaking (due to the relatively heavy strange quarks) is extended to the singlet sector, with some reasonable assumptions, in order to study η and η fragmentation. Due to the presence of SU(3) symmetry, fits to the π and K data help to constrain the fragme...

For any non negative real values h and k, an L(h, k)-labeling of a graph G = (V, E) is a function L : V → R such that |L(u) − L(v)| ≥ h if (u, v) ∈ E and |L(u)−L(v)| ≥ k if there exists w ∈ V such that (u, w) ∈ E and (w, v) ∈ E. The span of an L(h, k)-labeling is the difference between the largest and the smallest value of L. We denote by λh,k(G) the smallest real λ such that graph G has an L(h...

Given an undirected graph G, an L(h, k)-labelling of G assigns colors to vertices from the integer set {0, . . . , λh,k}, such that any two vertices vi and vj receive colors c(vi) and c(vj) satisfying the following conditions: i) if vi and vj are adjacent then |c(vi)− c(vj)| ≥ h; ii) if vi and vj are at distance two then |c(vi)− c(vj)| ≥ k. The aim of the L(h, k)-labelling problem is to minimiz...

امروزه در مبحث محاسبات رآکتورهای هسته‌ای مثل فرسایش و مدیریت سوخت، تحلیل گذرا بازسازی توان میله‌های به دنبال روش‌هایی جهت استفاده کدهای هستند که علاوه بر دقت قابل‌قبول از هزینه زمان بهینه‌ای برخوردار باشند. این پژوهش با گسسته‌سازی معادله پخش نوترون روش نودال بسط شار جریان ‌متوسط مرتبه بالا نشان داده می‌شود روش‌ بهینه قابل‌قبولی بهره می‌برد. مستقیم الحاقی نوترون، برای هندسه مربعی دوبعدی دو گروه ...