L.C.W. Wiggers, Frans J. Oort, Ron J.G. Peters, D.A. Legemate, Hanneke de Haes, Ellen M.A. Smets,
... on: Oxford Academic PubMed Google Scholar Frans J. Oort, Ph.D., Frans J. Oort, Ph.D. Department of Medical Psychology, Academic Medical ...
Tópico(s): Global Public Health Policies and Epidemiology
2006 - Oxford University Press | Nicotine & Tobacco Research
Myron H. Dembo, Sherri Gibson,
... Peter J.C. Sleegers, Eric E.J. Thoonen, Frans J. Oort, Thea T.D. Peetsma Changing classroom practices: the ... Peter J.C. Sleegers, Thea T.D. Peetsma, Frans J. Oort Can teachers motivate students to learn?, Educational Studies ...
Tópico(s): Collaborative Teaching and Inclusion
1985 - University of Chicago Press | The Elementary School Journal
Ching-Li Chai, Frans Oort Oort,
We define a notion of Weyl CM points in the moduli space Ag,1 of g-dimensional principally polarized abelian varieties and show that the André-Oort conjecture (or the GRH) implies the following statement: for any closed subvariety X Ag,1 over Q a , there exists a Weyl special point [(B, µ)] ∈ Ag,1(Q a ) such that B is not isogenous to the abelian variety A underlying any point [(A, λ)] ∈ X.The title refers to the case when g ≥ 4 and X is the Torelli locus; in this case Tsimerman has proved the statement unconditionally. ...
Tópico(s): Advanced Differential Equations and Dynamical Systems
2012 - Princeton University | Annals of Mathematics
Tópico(s): Rings, Modules, and Algebras
1964 - Springer Nature | Mathematische Annalen
implique l'accord avec les conditions générales d'utilisation (http://www.numdam.org/conditions).Toute utilisation commerciale ou impression systématique est constitutive d'une infraction pénale.Toute copie ou impression de ce fichier doit contenir la présente mention de copyright.Article numérisé dans le cadre du programme Numérisation de documents anciens mathématiques http://www.numdam.org/ 2 F. OORT.Signalons que le résultat du présent article, dans le cas des courbes algébriques, fait partie ...
1962 - Société Mathématique de France | Bulletin de la Société mathématique de France
Tópico(s): Nonlinear Waves and Solitons
1962 - Springer Nature | Mathematische Annalen
Tópico(s): Algebraic Geometry and Number Theory
1967 - Springer Science+Business Media | Inventiones mathematicae
Tópico(s): Algebraic Geometry and Number Theory
1966 - Springer Science+Business Media | Inventiones mathematicae
We restrict ourselves to two aspects of the field of group schemes, in which the results are fairly complete: commutative algebraic group schemes over an algebraically closed field (of characteristic
Tópico(s): Algebraic structures and combinatorial models
1966 - Springer Nature | Lecture notes in mathematics
INTRODUCTION.-Our aim in this paper is to study group schemes G of prime order p over a rather general base scheme S. Suppose G===Spec(A), S=:Spec(R),and suppose the augmentation ideal I==Ker(A-^R) is free of rank one over R (so G is of order p = 2), say I = Rrc; then there exist elements a and c in R such that x 2 = ax and such that the group structure on G is defined by sx=x(^)i-{-i(^)x-cx(^)x.One easily checks that ac=i\ conversely any factorization ac = 2 € R defines a group scheme of order 2 over R. In ...
Tópico(s): Homicide, Infanticide, and Child Abuse
1970 - Société Mathématique de France | Annales Scientifiques de l École Normale Supérieure
Frans J. Oort, David B. Mumford,
The answers to (A) and to the weaker question (B) are negative in general. However if in (B) moreover is given that N o is a commutative finite group scheme, the answer is affirmative; it is the aim of this paper to give a proof of this fact via deformation theory of finite group schemes in characteristic p > 0. As a byproduct we obtain a proof for the fact that any finite, local group scheme can be embedded into a formal Lie group with coefficients in the same field, on the same number of parameters.
Tópico(s): Advanced Topics in Algebra
1968 - Springer Science+Business Media | Inventiones mathematicae
Tópico(s): Polynomial and algebraic computation
1971 - Cambridge University Press | Compositio Mathematica
Tópico(s): Polynomial and algebraic computation
1975 - Springer Nature | Mathematische Annalen
Tópico(s): Polynomial and algebraic computation
1974 - Elsevier BV | Journal of Pure and Applied Algebra
Tópico(s): Polynomial and algebraic computation
1974 - Springer Science+Business Media | Inventiones mathematicae
On extra components in the functorial compactification of Ag.- On Mumford's uniformization and Neron models of Jacobians of semistable curves over complete rings.- Torelli theorem via Fourier-Mukai transform.- On the Andre-Oort conjecture for Hilbert modular surfaces.- Toroidal resolutions for some matrix singularities.- Formal Brauer groups and moduli of abelian surfaces.- Isogeny classes of abelian varieties with no principal polarizations.- Igusa's modular form and the classification of Siegel ...
Tópico(s): Algebraic structures and combinatorial models
1980 - Princeton University | Annals of Mathematics
Tópico(s): Coding theory and cryptography
1973 - Elsevier BV | Journal of Pure and Applied Algebra
Stewart C. Purkey, Marshall S. Smith,
... Peter J.C. Sleegers, Eric E.J. Thoonen, Frans J. Oort, Thea T.D. Peetsma Changing classroom practices: the ...
Tópico(s): Collaborative Teaching and Inclusion
1983 - University of Chicago Press | The Elementary School Journal
Tópico(s): Polynomial and algebraic computation
1985 - Elsevier BV | Journal of Pure and Applied Algebra
Tópico(s): Algebraic Geometry and Number Theory
1987 - American Mathematical Society | Proceedings of symposia in pure mathematics
Toshiyuki Katsura, Frans J. Oort,
Tópico(s): Cryptography and Residue Arithmetic
1987 - Cambridge University Press | Compositio Mathematica
Tomoyoshi Ibukiyama, Toshiyuki Katsura, Frans J. Oort,
Tópico(s): Analytic Number Theory Research
1986 - Cambridge University Press | Compositio Mathematica
Tsutomu Sekiguchi, Frans J. Oort, Noriyuki Suwa,
fichier doit contenir la présente mention de copyright.
Tópico(s): Homotopy and Cohomology in Algebraic Topology
1989 - Société Mathématique de France | Annales Scientifiques de l École Normale Supérieure
Heleen Maurice‐Stam, Frans J. Oort, Bob F. Last, Martha A. Grootenhuis,
This study aimed to examine factors that affect survivors' health-related quality of life (HRQoL), using a theoretical model in which demographic and medical characteristics explain HRQoL mediated by course of life, coping and social support. In a cross-sectional design, 353 survivors aged 18–30 years completed questionnaires. Structural equation modelling was performed to investigate the relationships among the variables in the model and to test whether the model fitted the data. The model fitted ...
Tópico(s): Palliative Care and End-of-Life Issues
2009 - Wiley | European Journal of Cancer Care
Eva‐Maria Merz, Ezgi Özeke-Kocabas, Frans J. Oort, Carlo Schuengel,
Although immigrants may be more dependent on their immediate family for support, they may also experience a wider generation-gap in values regarding intergenerational solidarity, because of processes of acculturation. Based on large scale survey data (N = 2,028), differences between first and second generation immigrants in values regarding intergenerational solidarity were examined among family members in the Netherlands with an immigration background from Turkey, Morocco, Suriname, and The Dutch ...
Tópico(s): Family Dynamics and Relationships
2009 - American Psychological Association | Journal of Family Psychology
Conor V. Dolan, Frans J. Oort, Reinoud D. Stoel, Jelte M. Wicherts,
We propose a method to investigate measurement invariance in the multigroup exploratory factor model, subject to target rotation. We consider both oblique and orthogonal target rotation. This method has clear advantages over other approaches, such as the use of congruence measures. We demonstrate that the model can be implemented readily in the freely available Mx program. We present the results of 2 illustrative analyses, one based on artificial data, and the other on real data relating to personality ...
Tópico(s): Advanced Statistical Modeling Techniques
2009 - Taylor & Francis | Structural Equation Modeling A Multidisciplinary Journal
Marlies Honingh, Frans J. Oort,
Purpose The purpose of this paper is to compare teachers' organisational behaviour in publicly‐ and privately‐funded schools in the Dutch Vocational Education and Training (VET) sector. Design/methodology/approach A percentage of all middle managers in publicly and privately funded schools (72 per cent and 43 per cent respectively) distributed self‐report questionnaires to their teachers measuring teachers' attitudes, sense of identification and perception of the school climate. The sample consisted ...
Tópico(s): Parental Involvement in Education
2009 - Emerald Publishing Limited | International Journal of Educational Management
Frans J. Oort, Mechteld R.M. Visser, Mirjam A. G. Sprangers,
Objective Response shift is generally associated with a change in the meaning of test scores, impeding the comparison of repeated measurements. Still, different researchers have different views of response shift. From a measurement perspective, response shift can be considered as bias in the measurement of change, whereas from a more conceptual perspective, it can be considered as bias in the explanation of change. We propose definitions to accommodate both interpretations of response shift. Study ...
Tópico(s): Advanced Causal Inference Techniques
2009 - Elsevier BV | Journal of Clinical Epidemiology
Heleen Maurice‐Stam, Frans J. Oort, Bob F. Last, Paul Brons, H.N. Caron, Martha A. Grootenhuis,
The aim of the study was to investigate: (1) health-related quality of life (HRQoL) and anxiety in school-aged cancer survivors during the first 4 years of continuous remission after the end of treatment; and (2) correlations of disease-related coping with HRQoL and anxiety. A total of 76 survivors aged 8-15 years completed questionnaires about HRQoL, anxiety and disease-related cognitive coping at one to five measurement occasions. Their HRQoL was compared with norm data, 2 months (n = 49) and 1 year ( ...
Tópico(s): Glioma Diagnosis and Treatment
2009 - Wiley | European Journal of Cancer Care
Bellinda L. King‐Kallimanis, Frans J. Oort, Marja Visser, Mirjam A. G. Sprangers,
Objective To illustrate different perspectives on response shift with cancer patients' health-related quality-of-life (HRQL) data. In measurement perspective, the focus is on bias in the measurement of HRQL. In conceptual perspective, the focus is on bias in the explanation of HRQL. Study Design and Setting Data came from a consecutive series of 202 newly diagnosed cancer patients, heterogeneous to cancer site, all undergoing surgery. A HRQL questionnaire was administered before and after surgery. ...
Tópico(s): Optimism, Hope, and Well-being
2009 - Elsevier BV | Journal of Clinical Epidemiology