Search results for "Void"

A rare form of spondylometaphyseal dysplasia-type A4

1998

We present 2 cases of a previously apparently unreported spondylo-metaphyseal dysplasia comprising dwarfism, severe metaphyseal changes, ovoid vertebrae and mild platyspondyly with anterior tonguing of the vertebral bodies. The inheritance may be autosomal recessive.

Kanoniczne procesy małżeńskie a prawo polskie

2018

A person-oriented approach to maternal homework involvement during the transition to lower secondary school

2022

This study examined patterns of mothers' homework involvement (n = 680 in Grade 6 and 665 in Grade 7) and changes in them during 12-year-old Finnish adolescents' (n = 848; 391 boys) transition to lower secondary school. Moreover, the extent to which adolescents' motivational behavior and prior academic achievement predicted these patterns was examined. The latent transition analyses identified four relatively stable latent patterns of maternal homework involvement in Grades 6 and 7: averagely involved, psychologically controlling and intrusive, noninvolved, and intrusive monitoring and helping. The higher task avoidance and the poorer achievement adolescents showed, the more likely their mo…

Off on the wrong foot : Task avoidance at the outset of primary school anticipates academic difficulties and declining peer acceptance

2021

The present study examined the academic antecedents of declining peer social status. Participants included 545 (311 boys, 234 girls) Finnish students followed from the 1st through the 4th grade (ages 6–8 at outset). Each year, teachers completed assessments of academic task avoidance and students completed standardized measures of reading and math achievement. Acceptance was assayed through peer nominations. Supporting the hypothesized model, the results indicated that a lack of interest and motivation at the outset of primary school leads to a downward spiral of academic difficulties and diminished peer acceptance. Specifically, academic task avoidance in 1st and 2nd grade anticipated decl…

Children's achievement behaviors in relation to their skill development and temperament

2013

The interplay between maternal homework involvement, task-avoidance, and achievement among adolescents.

2021

This study examined three aspects of maternal homework involvement (i.e., the quantity, quality, and source of initiative) and their direct and indirect associations with adolescents’ task-avoidant behavior in homework situations and academic achievement. The sample consisted of Finnish mothers and their adolescents who were transitioning from primary to lower secondary school. Mothers rated the quantity of their homework involvement (i.e., monitoring and help), quality of their homework involvement (i.e., autonomy support and psychological control), and source of initiative (i.e., mother- vs. adolescent-initiated monitoring and help) at the beginning of Grade 6. They also reported on adole…

Optical Absorption of Excimer Laser‐Induced Dichlorine Monoxide in Silica Glass and Excitation of Singlet Oxygen Luminescence by Energy Transfer from…

2021

An optical absorption (OA) band of interstitial dichlorine monoxide molecules with peak at 4.7 eV and halfwidth 0.94 eV is identified in F2 laser - irradiated (photon energy=7.9 eV) synthetic silica glass bearing both interstitial O2 and Cl2 molecules. Alongside with intrinsic defects, this OA band can contribute to solarization of silica glasses produced from SiCl4. While the formation of ClClO is confirmed by its Raman signature, its structural isomer ClOCl may also contribute to this induced OA band. Thermal destruction of this band between 300C and 400C almost completely restores the pre-irradiation concentration of interstitial Cl2. An additional weak OA band at 3.5 eV is tentatively a…

Collision Avoidance with Potential Fields Based on Parallel Processing of 3D-Point Cloud Data on the GPU

2014

In this paper we present an experimental study on real-time collision avoidance with potential fields that are based on 3D point cloud data and processed on the Graphics Processing Unit (GPU). The virtual forces from the potential fields serve two purposes. First, they are used for changing the reference trajectory. Second they are projected to and applied on torque control level for generating according nullspace behavior together with a Cartesian impedance main control loop. The GPU algorithm creates a map representation that is quickly accessible. In addition, outliers and the robot structure are efficiently removed from the data, and the resolution of the representation can be easily ad…

Prolonged stigma and flower lifespan in females of the gynodioecious plant Geranium sylvaticum

2017

In gynodioecious plants females need a reproductive advantage over hermaphrodites to be maintained in the same population. Generally, three main proximate causes for a female advantage are considered: inbreeding avoidance, different resource allocation patterns, and differences in ecological interactions. A mechanism potentially causing a female advantage that is rarely discussed is a difference in floral longevity between the genders. Females may have a longer stigma lifespan than hermaphrodites, which can affect pollination. Stigma and flower lifespan are rarely documented in gynodioecious species, although it is a common observation in dioecious species that female plants flower longer t…

Volatile compounds released by disturbed and undisturbed adults of Anchomenus dorsalis (Coleoptera, Carabidae, Platynini) and structure of the pygidi…

2011

Volatile compounds produced by adults of Anchomenus dorsalis under undisturbed and disturbed conditions were investigated with an all-glass aeration apparatus. GC-MS analysis of the crude extracts from undisturbed and disturbed adults highlighted four major volatile compounds, undecane, heneicosane, Z-9 tricosene and tricosane, of which significantly more undecane was released by disturbed adults compared to undisturbed beetles. The pygidial glands of adults of A. dorsalis were investigated using light and Transmission Electron Microscopy (TEM). Each gland showed dense aggregates of secretory cells organized into visually distinct lobes; a long collecting canal that drains the secretion tow…