Results 11 to 20 of about 1,796,570 (98)

Causal Analysis of a Migration of the Snout Butterfly, Libytheana bachmanii Iarvata (Strecker) (Libytheidae) [PDF]

open access: yes, 1983
Observation of a massive migration of the snout butterfly, Libytheana bachmanii larvata (Strecker), in central Texas in 1971 is described. An association of peak migration periods and periodic precipitation episodes is believed to be causal in nature ...
Neck, Raymond W.
core   +1 more source

The density matrix renormalization group for ab initio quantum chemistry [PDF]

open access: yes, 2014
During the past 15 years, the density matrix renormalization group (DMRG) has become increasingly important for ab initio quantum chemistry. Its underlying wavefunction ansatz, the matrix product state (MPS), is a low-rank decomposition of the full ...
Van Neck, Dimitri, Wouters, Sebastian
core   +2 more sources

Faddeev Random Phase Approximation for Molecules [PDF]

open access: yes, 2010
The Faddeev Random Phase Approximation is a Green's function technique that makes use of Faddeev-equations to couple the motion of a single electron to the two-particle--one-hole and two-hole--one-particle excitations.
Barbieri, Carlo   +2 more
core   +4 more sources

Functional assessment of the cervical spine in F-16 pilots with and without neck pain [PDF]

open access: yes, 2009
Introduction: Spinal symptoms in fighter pilots are a serious aeromedical problem. The most common neck complaints are muscular pain and strain. The aim of the current study was to determine possible differences in the cervical range of motion (CROM ...
Burnotte, Frederic   +7 more
core   +7 more sources

DMRG-CASPT2 study of the longitudinal static second hyperpolarizability of all-trans polyenes [PDF]

open access: yes, 2016
We have implemented internally contracted complete active space second order perturbation theory (CASPT2) with the density matrix renormalization group (DMRG) as active space solver [Y. Kurashige and T. Yanai, J. Chem. Phys.
Van Neck, Dimitri   +2 more
core   +2 more sources

Relative Odds of Neck Pain to Helmet Use Among Motorcyclists: a Case-Control Study [PDF]

open access: yes, 2020
Background: Neck pain is a widespread problem among motorcyclists, which is often neglected. There is limited research on the motorcycle's ergonomics, particularly in the context of the interaction between the riders and motorcycle.
Arslan, H. R. (Hafiz)   +2 more
core   +2 more sources

Inner products in integrable Richardson-Gaudin models [PDF]

open access: yes, 2017
We present the inner products of eigenstates in integrable Richardson-Gaudin models from two different perspectives and derive two classes of Gaudin-like determinant expressions for such inner products.
Claeys, Pieter W.   +2 more
core   +4 more sources

Exact solution of the $p_x + ip_y$ pairing Hamiltonian by deforming the pairing algebra [PDF]

open access: yes, 2014
The present paper makes a connection between collective bosonic states and the exact solutions of the $p_x + ip_y$ pairing Hamiltonian. This makes it possible to investigate the effects of the Pauli principle on the energy spectrum, by gradually ...
De Baerdemacker, Stijn   +2 more
core   +2 more sources

CheMPS2: a free open-source spin-adapted implementation of the density matrix renormalization group for ab initio quantum chemistry [PDF]

open access: yes, 2014
The density matrix renormalization group (DMRG) has become an indispensable numerical tool to find exact eigenstates of finite-size quantum systems with strong correlation.
Ayers, Paul W.   +3 more
core   +3 more sources

Lymphatic drainage patterns of head and neck cutaneous melanoma: does primary melanoma site correlate with anatomic distribution of pathologically involved lymph nodes? [PDF]

open access: yes, 2012
The aim of this study was to analyse patterns of metastatic spread from cutaneous head and neck melanoma, which are said to be highly variable.
Lukšić, Ivica   +3 more
core   +1 more source

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