Search results for "HESS"
showing 10 items of 97 documents
Llibres d’escacs i difusió del joc durant el regnat d’Alfons el Magnànim
2000
El treball significa una aproximació a l'estudi de la presència del joc dels escacs, a la Corona d'Aragó durant el regnat d'Alfons el Magnànim, i la difusió de llibres d'escacs (tant els tractats tècnics, com aquelles obres literàries que prenen com a base la metàfora o el motiu del joc dels escacs). Sobre la presència i difusió del joc aportarem notícies de múltiples inventaris notarials que esmenten taulers o peces d'escacs. Altra mostra que evidència aquesta presència són les prescripcions condemnatòries del joc que naixen de diverses instàncies eclesiàstiques i civils. Tractarem la presència de llibres d'escacs a la Biblioteca Napolitana del Magnànim al regne de Nàpols hi ha moltes notí…
Nuclear parton distribution functions with uncertainties in a general mass variable flavor number scheme
2020
In this article we obtain a new set of nuclear parton distribution functions (nuclear PDFs) at next-to-leading order and next-to-next-to-leading order accuracy in perturbative QCD. The common nuclear deep-inelastic scattering (DIS) data analyzed in our study are complemented by the available charged-current neutrino DIS data with nuclear targets and data from Drell-Yan cross-section measurements for several nuclear targets. In addition, the most recent DIS data from the Jefferson Lab CLAS and Hall C experiments are also added to our data sample. For these specific datasets, we consider the impact of target mass corrections and higher twist effects which are expected to be important in the r…
Analytic evaluation of the dipole Hessian matrix in coupled-cluster theory
2013
The general theory required for the calculation of analytic third energy derivatives at the coupled-cluster level of theory is presented and connected to preceding special formulations for hyperpolarizabilities and polarizability gradients. Based on our theory, we have implemented a scheme for calculating the dipole Hessian matrix in a fully analytical manner within the coupled-cluster singles and doubles approximation. The dipole Hessian matrix is the second geometrical derivative of the dipole moment and thus a third derivative of the energy. It plays a crucial role in IR spectroscopy when taking into account anharmonic effects and is also essential for computing vibrational corrections t…
<title>Additional usage possibilities for the computerized Hess screen</title>
2003
The purpose of the study was to work out a method how to use the computerized Hess screen in proximal vergence measurements. Proximal vergence or vergence due to knowledge of nearness is one of four independent components making up the total vergence response. Proximal vergence is expressed as a ratio - proximal convergence/test distance (PC/T). The computerized Hess screen is usually used to detect and to measure an ocular misalignment in patients with paralytic strabismus in different directions of gaze. The computerized Hess screen can be used to assess PC/T ratio in different directions of gaze, providing the open-loop disparity vergence and accommodation systems and assuming that tonic…
Escacs d'amor: una obertura al joc A Sol Post, 2: 45-74
1991
El poema colectivo valenciano de 1497 “Escacs d’Amor”, además de un gran interés literario presenta la singularidad de contener la primera partida de ajedrez con las reglas modernas. La obra es un poema alegórico que describe una imaginaria partida entre el dios Marte y la diosa Venus. Mercurio actúa de árbitro de la contienda amorosa, que acaba con el "mate" al amor de Venus. El poema tiene importancia para la historia del ajedrez porque las damas se mueven como en el juego actual. Nuestro trabajo analiza estos aspectos. La datación de la obra, en la Valencia de el fin de la decimoquinta centuria, en una encrucijada histórica, en un momento de transición entre dos formas diversas pero cont…
Détrompez-vous! Les étranges indignations de Stéphane Hessel décryptées
2011
National audience; Les indignations sélectives de la nouvelle icône médiatique qu'est devenu Stéphane Hessel se sont répandues sans contrôle ni vérification. En véritable saint du militantisme à la mode, il profère ses anathèmes, et pour ses adeptes, chacune de ses imprécations se transforme en une vérité révélée. L'indignation impérative devient alors un commandement pour tous. Contrevérités, exagérations, emphase larmoyante... En usant jusqu'à la corde la dimension compassionnelle des droits de l'homme, Stéphane Hessel se livre à un florilège d'assertions démesurées sans fondement dans la réalité. Ce vieil homme indigné ne fait pourtant que ressasser les perles scandaleuses de la stratégi…
A program for the simultaneous potentiometric determination of protonation constants and electrode calibration parameters
2005
A program for the potentiometric determination of the protonation constants of mononuclear polyprotic substances is described. A maximum of twelve parameters can be determined simultaneously, including up to six protonation constants, four electrode calibration parameters, the protolysis constant of the solvent and the titrant concentration. Optimization is carried out by using the non-simplified Newton-Raphson method, which is potentiated by the Marquardt algorithm and a distance speeding-up coefficient. A direct search method is also used to improve the initial set of values. Variances are calculated very accurately, since the real Hessian function is used. Statistical weights and ionic s…
Second-Order CASSCF Algorithm with the Cholesky Decomposition of the Two-Electron Integrals
2021
In this contribution, we present the implementation of a second-order complete active space–self-consistent field (CASSCF) algorithm in conjunction with the Cholesky decomposition of the two-electron repulsion integrals. The algorithm, called norm-extended optimization, guarantees convergence of the optimization, but it involves the full Hessian and is therefore computationally expensive. Coupling the second-order procedure with the Cholesky decomposition leads to a significant reduction in the computational cost, reduced memory requirements, and an improved parallel performance. As a result, CASSCF calculations of larger molecular systems become possible as a routine task. The performance …
Search for Galactic PeV gamma rays with the IceCube Neutrino Observatory
2013
Gamma-ray induced air showers are notable for their lack of muons, compared to hadronic showers. Hence, air shower arrays with large underground muon detectors can select a sample greatly enriched in photon showers by rejecting showers containing muons. IceCube is sensitive to muons with energies above ~500 GeV at the surface, which provides an efficient veto system for hadronic air showers with energies above 1 PeV. One year of data from the 40-string IceCube configuration was used to perform a search for point sources and a Galactic diffuse signal. No sources were found, resulting in a 90% C.L. upper limit on the ratio of gamma rays to cosmic rays of 1.2 x 10^(-3)for the flux coming from …
Are most of the stationary points in a molecular association minima? Application of Fraga's potential to benzene-benzene
1993
The importance of characterizing the stationary points of the intermolecular potential by means of Hessian eigenvalues is illustrated for the calculation of the benzene–benzene interaction using an atom-to-atom pair potential proposed by Fraga (FAAP). Two models, the standard one-center-per atom and another using three-centers-per atom due to Hunter and Sanders, are used to evaluate the electrostatic contributions and the results are compared. It is found in both cases that although using low-gradient thresholds allows optimization procedures to avoid many stationary points that are not true minima computing time considerations makes the usual procedure of using high-gradient thresholds [sa…