Search results for "differential"

Generalized wave propagation problems and discrete exterior calculus

2018

We introduce a general class of second-order boundary value problems unifying application areas such as acoustics, electromagnetism, elastodynamics, quantum mechanics, and so on, into a single framework. This also enables us to solve wave propagation problems very efficiently with a single software system. The solution method precisely follows the conservation laws in finite-dimensional systems, whereas the constitutive relations are imposed approximately. We employ discrete exterior calculus for the spatial discretization, use natural crystal structures for three-dimensional meshing, and derive a “discrete Hodge” adapted to harmonic wave. The numerical experiments indicate that the cumulat…

Decoupling on the Wiener space and variational estimates for BSDEs

2015

Topological canal foliations

2019

Regular canal surfaces of $\mathbb{R}^3$ or $\mathbb{S}^3$ admit foliations by circles: the characteristic circles of the envelope. In order to build a foliation of $\mathbb{S}^3$ with leaves being canal surfaces, one has to relax the condition “canal” a little (“weak canal condition”) in order to accept isolated umbilics. Here, we define a topological condition which generalizes this “weak canal” condition imposed on leaves, and classify the foliations of compact orientable 3-manifolds we can obtain this way.

Gap acceptance analysis in an urban intersection through a video acquired by an UAV

2014

Purpose of this paper is to apply a methodology previously developed to achieve an accurate measurements of the real traffic condition thought the use of a video acquired by an UAV (Unmanned Aerial Vehicle) and a probe vehicle equipped with a differential GPS. The used methodology is not invasive and thus, it doesn't influence the driver behavior. The used equipment must not be compared to the traditional techniques of traffic flow but it can be used for particular situations in which the installation of fixed detectors is not economic. In particular, we have analyzed the gap acceptance for an urban intersection between a main road with dual carriageway and two lanes in one direction, that …

Regularity and modulus of continuity of space-filling curves

2019

We study critical regularity assumptions on space-filling curves that possess certain modulus of continuity. The bounds we obtain are essentially sharp, as demonstrated by an example. peerReviewed

Higher Socioeconomic Status Predicts Less Risk of Depression in Adolescence: Serial Mediating Roles of Social Support and Optimism.

2020

Family socioeconomic status (SES) is known to have a powerful influence on adolescent depression. However, the inner mechanisms underlying this association are unclear. Here, we explore this issue by testing the potential mediating roles of social support (interpersonal resource) and optimism (intrapersonal resource), based on the predictions of the Reserve Capacity Model (RCM). Participants were 652 adolescents (age range: 11-20 years old, Mage =14.55 years, SD = 1.82; 338 boys (51.80%)) from two junior and two senior high schools in Wuhan, China. They completed questionnaires measuring family SES, perceived social support, trait optimism, and depression. Results showed, as predicted, (1) …

Retrotranspozonu struktūra parastās priedes (Pinus sylvestris L.) genomā un to ekspresija

2014

ANOTĀCIJA Promocijas darbs izstrādāts Latvijas Valsts mežzinātnes institūtā „Silava”. Pētījuma mērķis bija identificēt aktīvos retrotranspozonus parastās priedes (Pinus sylvestris L.) genomā un raksturot to transkripcijas līmeni dažādu stresa veidu ietekmē kontrolētos apstākļos. Pētījumā izmantoti nespecifiskie retrotranspozonu marķieri balstīti uz augsti konservatīvām tRNS piesaistes vietām. Viena klona priežu rametus pakļāva dabā izplatītam karstuma stresam, kukaiņu invāzijai (priežu hermess (Pineus pini L.), kā arī mākslīgi izraisītai augu hormonu (abscīzskābes un salicilskābes) ietekmei. Darba rezultātā identificēti pārsvarā I klases mobīlo elementu pārstāvji, kā arī tos saturošie himēr…

Schooling effects and earnings of French University graduates: school quality matters, but choice of discipline matters more

2010

Our aim in this article is to study the relation between earnings of French universities graduates and some characteristics of their universities. We exploit data from the Céreq's "Génération 98" survey, enriched with information on university characteristics primarily from the ANETES (yearbook of French institutions of higher education). We employ multilevel modeling, enabling us to take advantage of the natural hierarchy in our separate datasets, and thus to identify, and even to measure potential effects of institutional quality. Since we take into account many individual students characteristics, we are able to obtain an income hierarchy among the different disciplines : students who gr…

Emotional Profile and Intellectual Functioning

2015

Insufficient literature has been produced addressing children with borderline intellectual functioning (BIF) and gifted intellectual functioning (GIF). The goal of this work is to compare levels of self-esteem, depression, anxiety at school, and insecurity among children with BIF and GIF, and a control group of average intellectual functioning (AIF). There were participants of 104 children (fourth grade of primary school). Analyses revealed that children with BIF showed a lower level of self-esteem and higher levels of depression and school anxiety. Moreover, our findings highlight the co-occurrence of school anxiety, depressed mood, and insecurity among the BIF and AIF groups. One of the …

Recalled parental rearing style, self-esteem, and psychopathological symptoms in the general population

2020

The enduring impact of perceived parental behavior on self-esteem as well as anxiety and depression in adults is still unknown. In a large random route sample (age range 18?92), 4,747 subjects were asked to complete questionnaires about recalled parental rearing, selfesteem, anxiety, and depression. Structural equation modeling was used, and the data from the mother and the father version of the FEE (a questionnaire for recalled parental rearing) were analyzed separately. A model proposing that self-esteem mediates the relationship between parental behavior and psychopathological symptoms fits the data rather well (CFI = .95, RMSEA = .05, TLI = .94). Hence, the recalled authoritative parent…