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See detailStylistique et poésie
Freyermuth, Sylvie UL

Conference given outside the academic context (2010)

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See detailSub art. 213-217
Allegrezza, Silvia UL

in Codice di procedura penale commentato (2002)

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See detailThe Sub-Additives: A Proof Theory for Probabilistic Choice extending Linear Logic
Horne, Ross James UL

in 4th International Conference on Formal Structures for Computation and Deduction (FSCD 2019). (2019)

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See detailSub-bandgap photoconductivity and photocapacitance in CIGS thin films and devices
Igalson, Malgorzata; Urbaniak, A.; Krystopa, A. et al

in Thin Solid Films (2011), 519

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See detailSub-femtosecond electron transport in a nanoscale gap
Ludwig, Markus UL; Aguirregabiria, Garikoitz; Ritzkowsky, Felix et al

in Nature Physics (2019)

The strong fields associated with few-cycle pulses can drive highly nonlinear phenomena, allowing the direct control of electrons in condensed matter systems. In this context, by employing near-infrared ... [more ▼]

The strong fields associated with few-cycle pulses can drive highly nonlinear phenomena, allowing the direct control of electrons in condensed matter systems. In this context, by employing near-infrared single-cycle pulse pairs, we measure interferometric autocorrelations of the ultrafast currents induced by optical field emission at the nanogap of a single plasmonic nanocircuit. The dynamics of this ultrafast electron nanotransport depends on the precise temporal field profile of the optical driving pulse. Current autocorrelations are acquired with sub-femtosecond temporal resolution as a function of both pulse delay and absolute carrier-envelope phase. Quantitative modelling of the experiments enables us to monitor the spatiotemporal evolution of the electron density and currents induced in the system and to elucidate the physics underlying the electron transfer driven by strong optical fields in plasmonic gaps. Specifically, we clarify the interplay between the carrier-envelope phase of the driving pulse, plasmonic resonance and quiver motion. [less ▲]

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See detailSub-Laplacian comparison theorems on totally geodesic Riemannian foliations
Baudoin, Fabrice; Grong, Erlend; Kuwada, Kazumasa et al

in Calculus of Variations and Partial Differential Equations (2019), 58:130(4), 1-38

We develop a variational theory of geodesics for the canonical variation of the metric of a totally geodesic foliation. As a consequence, we obtain comparison theorems for the horizontal and vertical ... [more ▼]

We develop a variational theory of geodesics for the canonical variation of the metric of a totally geodesic foliation. As a consequence, we obtain comparison theorems for the horizontal and vertical Laplacians. In the case of Sasakian foliations, we show that sharp horizontal and vertical comparison theorems for the sub-Riemannian distance may be obtained as a limit of horizontal and vertical comparison theorems for the Riemannian distances approximations. [less ▲]

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See detailSub-millisecond time-resolved small-angle neutron scattering measurements at NIST
Glinka, Charles; Bleuel, Markus; Tsai, Peter et al

in Journal of Applied Crystallography (2020), 53(3),

Instrumentation for time-resolved small-angle neutron scattering measurements with sub-millisecond time resolution, based on Gähler's TISANE (time-involved small-angle neutron experiments) concept, is in ... [more ▼]

Instrumentation for time-resolved small-angle neutron scattering measurements with sub-millisecond time resolution, based on Gähler's TISANE (time-involved small-angle neutron experiments) concept, is in operation at NIST's Center for Neutron Research. This implementation of the technique includes novel electronics for synchronizing the neutron pulses from high-speed counter-rotating choppers with a periodic stimulus applied to a sample. Instrumentation details are described along with measurements demonstrating the utility of the technique for elucidating the reorientation dynamics of anisometric magnetic particles. [less ▲]

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See detailSub-Riemannian Geometry on Infinite-Dimensional Manifolds
Grong, Erlend UL; Irina, Markina; Vasil'ev, Alexander

in Journal of Geometric Analysis (The) (2015), 25(4), 2474-2515

We generalize the concept of sub-Riemannian geometry to infinite- dimensional manifolds modeled on convenient vector spaces. On a sub-Riemannian manifold M, the metric is defined only on a sub-bundle H of ... [more ▼]

We generalize the concept of sub-Riemannian geometry to infinite- dimensional manifolds modeled on convenient vector spaces. On a sub-Riemannian manifold M, the metric is defined only on a sub-bundle H of the tangent bundle T M, called the horizontal distribution. Similarly to the finite-dimensional case, we are able to split possible candidates for minimizing curves into two categories: semi-rigid curves that depend only on H, and normal geodesics that depend both on H itself and on the metric on H. In this sense, semi-rigid curves in the infinite-dimensional case generalize the notion of singular curves for finite dimensions. In particular, we study the case of regular Lie groups with invariant sub-Riemannian structure. As examples, we consider the group of sense-preserving diffeomorphisms Diff S1 of the unit circle and the Virasoro–Bott group with their respective horizontal distributions chosen to be the Ehresmann connections with respect to a projection to the space of normalized univalent functions. In these cases we prove controllability and find formulas for the normal geodesics with respect to the pullback of the invariant Kählerian metric on the class of normalized univalent functions. The geodesic equations are analogues to the Camassa–Holm, Hunter–Saxton, KdV, and other known non-linear PDE. [less ▲]

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See detailSub-second dynamic phototuning of alignment in azodendrimer-doped nematic liquid crystal shells
Noh, Junghyun UL; Jampani, Venkata UL; Haba, Osamu et al

in Journal of Molecular Liquids (2018), 267

The alignment of nematic liquid crystal 5CB in micron-thick shells, suspended in and containing aqueous liquid phases, can be rapidly switched between radial (homeotropic) and tangential (planar) director ... [more ▼]

The alignment of nematic liquid crystal 5CB in micron-thick shells, suspended in and containing aqueous liquid phases, can be rapidly switched between radial (homeotropic) and tangential (planar) director field by doping them with a photoresponsive dendrimer with multiple azobenzene moieties in the branches. The dendrimer spontaneously segregates to the inner as well as outer shell interfaces, folding into an amphiphilic conformation irrespective of the sign of interface curvature. The branches are directed into the liquid crystal, inducing a homeotropic ground state. Upon UV irradiation, the trans-cis isomerization of azobenzene triggers immediate switching to planar alignment. The very fast realignment and the simultaneous response throughout the shell leads to an initially random planar director field, with many topological defects of both positive and negative signs becoming visible within a second of irradiation. All but two +1 defects quickly annihilate, and the remaining defect pair moves up towards the thinnest part of the shell to form the planar steady state. By illuminating with visible light the homeotropic alignment is quickly recovered. By exchanging the solvent used for assisting the dendrimer dissolution, also dynamic phase separation phenomena can be studied in the shells, revealing that the dendrimer solubility in 5CB is greater in the UV-induced cis state than in the trans ground state. [less ▲]

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See detailSubcellular origin of mitochondrial DNA deletions in human skeletal muscle.
Vincent, Amy E; Rosa, Hannah S; Pabis, Kamil et al

in Annals of Neurology (2018), 84(2), 289-301

OBJECTIVE: In patients with mitochondrial DNA (mtDNA) maintenance disorders and with aging, mtDNA deletions sporadically form and clonally expand within individual muscle fibers, causing respiratory chain ... [more ▼]

OBJECTIVE: In patients with mitochondrial DNA (mtDNA) maintenance disorders and with aging, mtDNA deletions sporadically form and clonally expand within individual muscle fibers, causing respiratory chain deficiency. This study aimed to identify the sub-cellular origin and potential mechanisms underlying this process. METHODS: Serial skeletal muscle cryosections from patients with multiple mtDNA deletions were subjected to subcellular immunofluorescent, histochemical, and genetic analysis. RESULTS: We report respiratory chain-deficient perinuclear foci containing mtDNA deletions, which show local elevations of both mitochondrial mass and mtDNA copy number. These subcellular foci of respiratory chain deficiency are associated with a local increase in mitochondrial biogenesis and unfolded protein response signaling pathways. We also find that the commonly reported segmental pattern of mitochondrial deficiency is consistent with the three-dimensional organization of the human skeletal muscle mitochondrial network. INTERPRETATION: We propose that mtDNA deletions first exceed the biochemical threshold causing biochemical deficiency in focal regions adjacent to the myonuclei, and induce mitochondrial biogenesis before spreading across the muscle fiber. These subcellular resolution data provide new insights into the possible origin of mitochondrial respiratory chain deficiency in mitochondrial myopathy. [less ▲]

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See detailThe subgroup measuring the defect of the abelianization of $ SL_2(\Bbb Z[i])$
Rahm, Alexander UL

in Journal of Homotopy & Related Structures (2014), 9(2), 257--262

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See detailSubjectifications and Subjectivations
Reckinger, Rachel UL; Wille, Christian UL; Boesen, Elisabeth UL et al

in Wille, Christian; Reckinger, Rachel; Kmec, Sonja (Eds.) et al Spaces and Identities in Border Regions. Politics – Media – Subjects (2016)

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See detailSubjectivation du métier d'enseignant et rapport au savoir
Weber, Jean-Marie UL; Strohmer, Julia UL

Scientific Conference (2012, June 05)

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See detailSubjective Age Across the Life Span: A Differentiated, Longitudinal Approach
Kornadt, Anna Elena UL; Hess, Thomas M.; Voss, Peggy et al

in JOURNALS OF GERONTOLOGY SERIES B-PSYCHOLOGICAL SCIENCES AND SOCIAL SCIENCES (2018), 73(5), 767-777

Objectives: How old people feel compared with their actual age, their so-called "subjective age" (SA), is a central indicator of individual aging experiences and predicts developmental outcomes, such as ... [more ▼]

Objectives: How old people feel compared with their actual age, their so-called "subjective age" (SA), is a central indicator of individual aging experiences and predicts developmental outcomes, such as health and mortality, across the life span. We investigated the multidimensional structure of SA with respect to specific life domains, focusing on domain differences as well as age group differences and age-related changes. Furthermore, we inspected the relationship between SA and how people perceive their future as old persons (future self-views). Method: We assessed these variables in a sample of 593 persons who completed a questionnaire at two time points 4 years apart (baseline-T 1; follow up-T 2) and who were aged 30-80 years at T 1. Results: SA differed across life domains and age groups, and the amount of change in SA across time was also contingent on life domain. Future self-views at T 1 predicted subsequent changes in SA, with more negative self-views being associated with an increase in SA, especially for middle-aged participants for whom the transition to older age is imminent. Discussion: Our results provide support for a multidimensional view of subjective aging experiences. They highlight the importance of a differentiated investigation of subjective aging constructs and their relations for understanding how these variables shape the aging process. [less ▲]

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See detailSUBJECTIVE AGING: SOMETHING UNIQUE OR JUST ANOTHER EXPRESSION OF GENERAL SELF-BELIEFS?
Klusmann, Verena; Spuling, Svenja M.; Bowen, Catherine E. et al

in Innovation in Aging (2019), 3(Supplement_1), 786-787

Using data from the German Ageing Survey (adults aged 40‒85), this study tested the convergent and discriminant validity of subjective aging measures by comparing three different measures of subjective ... [more ▼]

Using data from the German Ageing Survey (adults aged 40‒85), this study tested the convergent and discriminant validity of subjective aging measures by comparing three different measures of subjective aging with one another and relating them to established measures of general self-beliefs (optimism, self-efficacy, subjective health) and subjective well-being (depression, affect). Correlations between subjective aging measures ranged from ‒.61 (amongst general self-perceptions of aging measures) to ‒.09, with subjective age being least related to the other measures. The highest overlap was observed between optimism and global self-perceptions of aging (.69) and it was for these global self-perceptions that the highest amount of variance could be explained by correlates in a regression analysis (R-square=.55). In contrast, only 10% of variance could be explained for subjective age. Our results underline the merit of taking the multidimensional nature of subjective aging into account since global measures appear less distinct from general personality traits. [less ▲]

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See detailSubjective and behavioral presence measurement and interactivity in the collaborative augmented reality game TimeWarp
von der Pütten, Astrid; Jennifer Klatt, Jennifer; Ten Broeke, Simon et al

in Interacting with Computers (2012), 24(4), 317-325

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See detailSubjective Health Complaints in Adolescence - Validity of the HBSC Symptom Checklist in Luxembourg
Catunda, Carolina UL; Heinz, Andreas UL; Willems, Helmut UL

Poster (2018)

The HBSC Symptom Checklist (HBSC-SCL) consists on an eight-item scale developed for the Health Behaviour in School-aged Children survey to measure adolescent health complaints. Although it was developed ... [more ▼]

The HBSC Symptom Checklist (HBSC-SCL) consists on an eight-item scale developed for the Health Behaviour in School-aged Children survey to measure adolescent health complaints. Although it was developed based on a RASCH measurement analysis which proved that the items are indicators of a unidimensional latent trait, some studies suggests a two highly correlated dimensions. The objective of this study is to test the validity of the Luxembourgish version of the HBSC-SCL. Methods: The 2014 HBSC Luxembourg survey took place during the 2013/14 school year. A total of 590 classes following the national curriculum were randomly selected and 7 757 students aged from 11 to 18 years old responded to the questionnaire translated to both French and German distributed by their teachers. Findings: First, the Kaiser-Meyer-Olkin criterion and the Bartlett sphericity test indicated the use of a factor analysis (KMO=.88; p<.001). A Principal Component Analysis with Varimax Rotation (with the Eigenvalues over 1) and a scree plot test suggests a one factor matrix with a total variance explained of 47%. Discussion: Factor analysis support the existence of a single factor for the Luxemburgish population in accordance with the preliminary model developed. Literature have mixed results, with the possibility to compute one or two health complaints scores. More studies should confirm these findings but as the internal consistency possibly depends on the country studied, it is recommended this be systematically checked. [less ▲]

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See detailSubjective Reasons for Using versus not Using Assistive Technologies in Aging Population: A Meta-Synthesis of Qualitative Studies
Abri, Diana UL; Boll, Thomas UL

Poster (2019, May 24)

The number of older people with limitations of activities of daily living in developing countries is predicted to increase by a factor of four between 2015 and 2050. One possibility to overcome such ... [more ▼]

The number of older people with limitations of activities of daily living in developing countries is predicted to increase by a factor of four between 2015 and 2050. One possibility to overcome such limitations is to promote the use of assistive technologies (ATs) in the aging population. Despite evident benefits of ATs in this context, the use rate is still low. To find out why this is the case, we performed systematic literature searches in PsycINFO, MEDLINE, and Google Scholar databases about subjective reasons of older people for use and non-use of these devices. We then performed a meta-synthesis of the relevant studies in order to arrive at a comprehensive view of older people’s reasons for the use or non-use of ATs. Beliefs about ease to use and reliability of AT use as well as perceived suggestion by significant others to use ATs were important reasons for using them. Beliefs about insecurity, uselessness and other attributes of ATs as well as desires to avoid burden for others were major reasons for not using of ATs. We systematized the identified subjective reasons for using versus not using as referring to (1) situation of need and demand for an AT, (2) suggestion by significant others, (3) act of using, and (4) consequences of AT use. Most of the reasons were reasons for non-use such as beliefs about negative attributes of ATs, and the consequences of their use. In contrast, desires were only rarely mentioned as reasons for use or non-use of ATs. Comparing subjective reasons of our meta-synthesis with predictors in ATs use models, we found that only 5 out of 25 identified subjective reasons have already been considered in these models. Thus, these models appear not yet to be sufficiently comprehensive. We suggest integrating the identified subjective reasons from our meta-synthesis as additional predictors in a comprehensive AT use model with an improved predictive power. [less ▲]

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See detailSubjective remaining lifetime and concreteness of the future as differential predictors of preparation for age-related changes
Kornadt, Anna Elena UL; Voss, Peggy; Rothermund, Klaus

in EUROPEAN JOURNAL OF AGEING (2018), 15(1), 67-76

Demographic changes have been linked to the expectation of cuts in government-provided social security services, emphasizing individual responsibility to prepare for old age and concomitant challenges and ... [more ▼]

Demographic changes have been linked to the expectation of cuts in government-provided social security services, emphasizing individual responsibility to prepare for old age and concomitant challenges and changes. Accordingly, the identification of psychological variables predicting preparation is a matter of theoretical as well as practical importance. We thus consider different aspects of a person's future time as theoretically prominent psychological predictors of preparation. The subjectively perceived quantity of remaining lifetime, the concreteness of future time, and preparation for life domains indicative of an active third age as well as of a more dependent fourth age were assessed in a longitudinal study in a core sample of N = 593 participants (30-80 years old at T (1)) at two measurement occasions 4 years apart. The quantity of subjective remaining lifetime predicted subsequent changes in preparation, but this effect was restricted to preparation for the fourth age. In contrast, a more open and concrete outlook on ones' personal future predicted changes in preparation for an active third age. Our findings highlight the importance of distinguishing between different aspects of future time-its quantity versus its relation to goals and action plans-when predicting specific facets of developmental self-regulation. [less ▲]

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See detailSubjective well-being in older adults: Current state and gaps of research
Ferring, Dieter UL; Boll, Thomas UL

in Bovenberg, Lans; Van Soest, Arthur; Zaidi, Asghar (Eds.) Ageing, health and pensions in Europe (2010)

Reviews research on subjective well-being in older adults and describes remaining desiderata. After introducing the topic of subjective well-being (SWB) in older adults, various policy questions related ... [more ▼]

Reviews research on subjective well-being in older adults and describes remaining desiderata. After introducing the topic of subjective well-being (SWB) in older adults, various policy questions related to that topic are formulated. Then the major advances in research are described. These refer to a conceptual clarification and measurement issues of SWB and related concepts (e.g., life satisfaction), the internal structure of SWB, the theoretical status of SWB in causal networks, main findings about the developmental course, causes, and consequences of SWB in older adults, and theoretical models about SWB regulation in this population. Based on that, remaining gaps in knowledge and potential research directions for SWB especially in older adults are highlighted. These are related to the measurement of SWB, the limited age range and age segmentation in empirical studies on SWB, the causes of SWB and its regulation as well as effective policy measures to promote SWB. Then, the current state of European infrastructures and desirable developments related to research on SWB in older adults are described (large-scale longitudinal studies on aging, regular representative surveys of the general and the older population, international research cooperations and networks). Finally, the significance of the available and expected future knowledge for social policy decision making is discussed. [less ▲]

Detailed reference viewed: 230 (26 UL)