Search results for "element"
showing 10 items of 13601 documents
Structure of superheavy nuclei along decay chains of element 115
2014
[Introduction] A recent high-resolution α , X -ray, and γ -ray coincidence-spectroscopy experiment offered the first glimpse of excitation schemes of isotopes along α -decay chains of Z = 115. To understand these observations and to make predictions about shell structure of superheavy nuclei below 288 115, we employ two complementary mean-field models: the self-consistent Skyrme energy density functional approach and the macroscopic-microscopic Nilsson model. We discuss the spectroscopic information carried by the new data. In particular, candidates for the experimentally observed E 1 transitions in 276 Mt are proposed. We find that the presence and nature of low-energy E 1 transitions in w…
Primary Student-Teachers’ Practical Knowledge of Inquiry-Based Science Teaching and Classroom Communication of Climate Change
2015
A teacher’s practical knowledge contains the teacher’s beliefs about the goals, values and principles of education that guide his or her actions in the classroom. There is still a lack of knowledge about how teachers’ practical knowledge influences their teaching. The present study examines student teachers’ practical knowledge in the context of teaching climate change in elementary schools. Participating student-teachers planned their lessons using the principles and ideas of inquiry-based science teaching and the communicative approach. The same two approaches were applied in analysing the lessons, providing a broader basis on which to study student-teachers’ beliefs about teaching scienc…
Pupils’ mathematical self-concept in the beginning of the sixth grade
2016
The article shows the mathematical self-concept of the sixth grade pupils (n=57) in relation to their mathematical skills in school. Mathematical skills were measured with the help of a survey of the command of the decimal system and on the basis of the report grades in mathematics. The pupils’ mathematical self-concept was surveyed in the beginning of the sixth grade with the interviews and a questionnaire using the Likert-scale. The mathematical self-concept seemed to be more positive the better the mathematics skills pupils had. peerReviewed
Della confessione: nozione
2010
Divisores primos del orden de productos de elementos en grupos finitos
2018
Un tema clásico en Teoría de Grupos es el estudio de la relación entre la estructura de un grupo finito y sus longitudes de clases de conjugación o sus grados de caracteres. Originalmente, el objetivo de esta tesis era la obtención de resultados sobre órdenes de elementos análogos a los ya existentes para clases de conjugación o caracteres. Finalmente, hemos obtenido resultados novedosos sobre órdenes de elementos que no existían en la literatura para grados de caracteres o longitudes de clases de conjugación. En particular, en esta memoria estudiamos qué información puede obtenerse sobre la estructura de un grupo a partir de la relación existente entre los órdenes de ciertos elementos y de…
Od iskierki z popielnika do pożogi : motyw ognia i jego funkcje w wybranych utworach dla dzieci i młodzieży
2021
Authors of literature for children and young adults are reluctant to use the theme of fire despite the fact that fiery metaphors were used by editors of interwar and post- -WW1I magazines aimed at this age group: Płomyk (Flame), Płomyczek (Little Flame), Mały Płomyczek (Tiny Flame), Słonko (Little Sun), and Iskierki (Sparks). Perhaps there is a lack o f ideas for presenting it in an interesting way that refrains from didacticism and empty moralizing. Texts about fire show the opposition o f good and evil. Authors o f poems aim to stimulate visual perception o f the reader through a palette o f colours ranging from yellow to orange to red. There is also black, introduced in the form of a smo…
A Composite Phononic Crystal Design for Quasiparticle Lifetime Enhancement in Kinetic Inductance Detectors
2020
A nanoscale phononic crystal filter (reflector) is designed for a kinetic inductance detector where the reflection band is matched to the quasiparticle recombination phonons with the aim to increase quasiparticle lifetime in the superconducting resonator. The inductor is enclosed by a 1-μm-wide phononic crystal membrane section with two simple hole patterns that each contain a partial spectral gap for various high-frequency phonon modes. The phononic crystal is narrow enough for low-frequency thermal phonons to propagate unimpeded. With 3D phonon scattering simulation over a 40 dB attenuation in transmitted power is found for the crystal, which is estimated to give a lifetime enhancement of…
Prospectives to tractor cabin design with computational acoustics tools
2011
Computational acoustical models allow automated optimization of tractor design with respect to acoustic properties, which could speed up significantly the design process of tractor cabin prototypes. This article gives insightful prospectives to the tractor design process by considering modern computational acoustics technology. Mathematical formulation for a system consisting of vibrating elastic tractor structure and airfilled acoustic enclosure are given and a related numerical solution technique with finite element method (FEM) is presented. Simulation results produced with commercially available software are reviewed. nonPeerReviewed
Multiobjective muffler shape optimization with hybrid acoustics modelling
2010
Shape optimization of a duct system with respect to sound transmission loss is considered. The objective of optimization is to maximize the sound transmission loss at multiple frequency ranges simultaneously by adjusting the shape of a reactive muffler component. The noise reduction problem is formulated as a multiobjective optimization problem. The sound attenuation for each considered frequency is determined by a hybrid method, which requires solving Helmholtz equation numerically by finite element method. The optimization is performed using non-dominated sorting genetic algorithm, NSGA-II, which is a multi-objective genetic algorithm. The hybrid numerical method is flexible with respect …