13,690 research outputs found
A Profile of Fatherhood Among Young Men: Moving Away from Their Birth Family and Closer to Their Child.
No full textHave things changed all that much in terms of how fatherhood is conceptualized and exercised in daily life? That is the question underlying this article. The author compares the findings of a recent analysis on certain aspects of the lived experiences of young fathers (under 25 years of age) with the results of studies undertaken over the past ten years, and replies in the affirmative. First of all, when considering the representations held of fathers or mothers, most of these young fathers believe that their role is a multi-faceted one, and that it is often identical to that of their spouse. According to young fathers, fatherhood is a dual experience that requires them to be present on a daily basis while also casting their eye on the future. This is an experience that is constructed out of affectionate moments, child-care duties, education in the literal sense, and especially out of shared experiences with their spouse. In addition, they question the degree to which involvement in a career should take precedence over involvement in their child's life. In other words, the former 'competes' with their ability to be present in their child's daily life, which denotes a change from the attitudes of previous generations.Fatherhood, Young Fathers, Representation, Paternal Identity, Qualitative Research
Efficient Generation of Permutationally Invariant Potential Energy Surfaces for Large Molecules
No full textAn efficient method is described for generating a fragmented, permutationally invariant polynomial basis to fit electronic energies and, if available, gradients for large molecules. The method presented rests on the fragmentation of a large molecule into any number of fragments while maintaining the permutational invariance and uniqueness of the polynomials. The new approach improves on a previous one reported by Qu and Bowman by avoiding repetition of polynomials in the fitting basis set and speeding up gradient evaluations while keeping the accuracy of the PES. The method is demonstrated for CH3-NH-CO-CH3 (N-methyl acetamide) and NH2-CH2-COOH (glycine)
Sparse Learning for Linear Twin Parameter-margin Support Vector Machine
No full textTwin Parameter-margin support vector machine (TPMSVM) is a recent very powerful binary classifier. To improve its sparsity, a linear sparse TPMSVM (Lin-STPMSVM) is proposed in this paper. In the primal problem, the vectors defining the hyperplane are replaced with their expression in terms of the dual variables as derived from Karush Khun Tucker (KKT) conditions. Then the new primal problems are directly optimized, thus ensuring the sparsity of the solutions. Numerical experiments show that the solution obtained by new model is more sparse without reducing the accuracy. Therefore, Lin-STPMSVM not only inherits the advantages of TPMSVM, but also has the characteristics of sparsity, stability and robustness in dealing with classification problems
Permutationally invariant fitting of many-body, non-covalent interactions with application to three-body methane-water-water
No full textA modified, computationally efficient method to provide permutationally invariant polynomial bases for molecular energy surface fitting via monomial symmetrization (Xie Z.; Bowman J. M. J. Chem. Theory Comput. 2010, 6, 26-34) is reported for applications to complex systems, characterized by many-body, non-covalent interactions. Two approaches, each able to ensure the asymptotic zero-interaction limit of intrinsic potentials, are presented. They are both based on the tailored selection of a subset of the polynomials of the original basis. A computationally efficient approach exploits reduced permutational invariance and provides a compact fitting basis dependent only on intermolecular distances. We apply the original and new techniques to obtain a number of full-dimensional potentials for the intrinsic three-body methane-water-water interaction by fitting a database made of 22,592 ab initio energies calculated at the MP2-F12 level of theory with haTZ (aug-cc-pVTZ for C and O, cc-pVTZ for H) basis set. An investigation of the effects of permutational symmetry on fitting accuracy and computational costs is reported. Several of the fitted potentials are then employed to evaluate with high accuracy the three-body contribution to the CH4-H2O-H2O binding energy and the three-body energy of three conformers of the CH4(H2O)20 cluster
Code de construction du Qu\ue9bec, chapitre III, Plomberie, et code national de la plomberie, Canada 2010 (modifi\ue9)
No full textCette nouvelle \ue9dition, publi\ue9e par le CNRC en collaboration avec la R\ue9gie du b\ue2timent du Qu\ue9bec, comprend les modifications au chapitre III, Plomberie, du Code de construction, et les dispositions de l\u2019\ue9dition 2010 du Code national de la plomberie (CNP) remani\ue9es de mani\ue8re \ue0 signaler clairement aux lecteurs les modifications adopt\ue9es par le Qu\ue9bec et visant les travaux de construction et de r\ue9novation des b\ue2timents dans cette province. Ce document inclut des modifications propres au Qu\ue9bec visant, entre autres, la refonte des m\ue9thodes de dimensionnement du r\ue9seau d\u2019eau potable, les robinets avec une teneur en plomb d\u2019au plus 0,25 % et les exigences d\u2019\ue9conomie d\u2019eau. Des dispositions relatives \ue0 la r\ue9utilisation des eaux grises y sont \ue9galement consign\ue9es. Il s\u2019agit d\u2019un outil indispensable pour quiconque souhaite concevoir ou mettre en place des installations de plomberie au Qu\ue9bec.Peer reviewed: YesNRC publication: Ye
Review of Marie Guyart de l���Incarnation (1599-1672): Le singulier parcours d���une ursuline missionnaire de Tours �� Qu��bec. Brussels" by Suzanhe C. Toczyski
No full textVincent Gr��goire. Marie Guyart de l���Incarnation (1599-1672): Le singulier parcours d���une ursuline missionnaire de Tours �� Qu��bec. Brussels: Peter Lang, 2022. 182 pp. $45.95. Review by Suzanne C. Toczyski, Sonoma State Univers
Geochronology and geochemistry of Early Mesoproterozoic meta-diabase sills from Quruqtagh in the northeastern Tarim Craton: implications for breakup of the Columbia supercontinent
No full textAbstract not availableChang-Zhi Wu, M. Santosh, Yan-Jing Chen, Iain M. Samson, Ru-Xiong Lei, Lian-Hui Dong, Xun Qu, Lian-Xing G
Que Reste-T-Il Des H�ritiers Et De La Reproduction (1964-1971) Aujourd'hui? Questions, M�thodes, Concepts Et R�ception D'une Sociologie De L'�ducation
No full textJ\'ai essay� de restituer ici quelques informations historiographiques, � partir de mes notes d\'enseignement, de documents de recherche des ann�es 60 et, le plus souvent, de simples souvenirs de discussions avec d\'autres chercheurs ; souvenirs aussi de lectures d\'ouvrages et de compte-rendus de cette �poque ou de confrontations avec des auditoires (universitaires ou non) dans des d�bats publics. Je me suis donc plac� dans le cadre des questions pos�e par J.-L. Robert dans son introduction � la Journ�e d\'�tudes sur \' les concepts �labor�s dans la p�riode 1945-1975 ,\' ainsi que des d�marche qui se voulaient scientifiques avec leurs m�thodes, leurs questions, leurs objets, leurs sources et conclusions \' ; mais aussi dans le cadre du suivi, sur deux d�cennies, de \' la diffusion et de l\'appropriation des concepts \' qui concernaient au premier chef la sociologie de l\'�ducation et de la culture . Je r�ponds ainsi � plusieurs questions de fait que posait J.-M. Chapoulie dans son introduction ou sur lesquelles il a sollicit� ma m�moire. Mais je n\'entre pas dans le rappel de ce qu\'ont �t� mes rapports personnels avec Bourdieu durant la douzaine d\'ann�es de collaboration �troite o� s\'est �labor�e une sociologie de l\'�ducation qui nous �tait en gros commune et qui l\'est rest�e, en d�pit de notre divergence �pist�mologique apr�s 1972, puisque je viens d\'en donner un aper�u dans un article r�cent[No keywords]
Modelling the magnetic activity and filtering radial velocity curves of young Suns : the weak-line T Tauri star LkCa 4
No full textSGG acknowledges support from the Science & Technology Facilities Council (STFC) via an Ernest Rutherford Fellowship [ST/J003255/1]. SHPA acknowledges financial support from CNPq, CAPES and Fapemig.We report results of a spectropolarimetric and photometric monitoring of the weak-line T Tauri star LkCa 4 within the Magnetic Topologies of Young Stars and the Survival of close-in giant Exoplanets (MaTYSSE) programme, involving ESPaDOnS at the Canada–France–Hawaii Telescope. Despite an age of only 2 Myr and a similarity with prototypical classical T Tauri stars, LkCa 4 shows no evidence for accretion and probes an interesting transition stage for star and planet formation. Large profile distortions and Zeeman signatures are detected in the unpolarized and circularly polarized lines of LkCa 4 using Least-Squares Deconvolution (LSD), indicating the presence of brightness inhomogeneities and magnetic fields at the surface of LkCa 4. Using tomographic imaging, we reconstruct brightness and magnetic maps of LkCa 4 from sets of unpolarized and circularly polarized LSD profiles. The large-scale field is strong and mainly axisymmetric, featuring a ≃2 kG poloidal component and a ≃1 kG toroidal component encircling the star at equatorial latitudes – the latter making LkCa 4 markedly different from classical T Tauri stars of similar mass and age. The brightness map includes a dark spot overlapping the magnetic pole and a bright region at mid-latitudes – providing a good match to the contemporaneous photometry. We also find that differential rotation at the surface of LkCa 4 is small, typically ≃5.5 times weaker than that of the Sun, and compatible with solid-body rotation. Using our tomographic modelling, we are able to filter out the activity jitter in the radial velocity curve of LkCa 4 (of full amplitude 4.3 km s−1) down to an rms precision of 0.055 km s−1. Looking for hot Jupiters around young Sun-like stars thus appears feasible, even though we find no evidence for such planets around LkCa 4.Peer reviewe
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