Search results for "Wald"
showing 10 items of 81 documents
Meinvalda pārgrupēšanās jonu šķidrumu vidē
2016
Meinvalda pārgrupēšanās jonu šķidrumu vidē. Ikkere L.E., darba vadītājs Dr.h.ķīm., prof. Zicmanis A. Bakalaura darbs, 54 lappuses, 24 attēli, 12 tabulas, 42 literatūras avoti, 5 pielikumi. Latviešu valodā. Bakalaura darba literatūras apskatā ir apkopota galvenā informācija par Meinvalda pārgrupēšanās reakcijām, to katalizatoriem, kā arī par jonu šķidrumiem. Laboratorijā tika veikta trīs jonu šķidrumu sintēze. To struktūras tika pierādītas, izmantojot 1H KMR un IS spektroskopijas metodes. Tika piemeklēti piemērotākie gāzu hromatogrāfijas apstākļi, lai noteiktu pārgrupēšanās reakciju izejvielas un produktus. Tika pārbaudīti dažādu anjonu un slāpekli saturošu katjonu jonu šķidrumu izmantošana …
How is weight stigma related to children's health-related quality of life? A model comparison approach
2018
Purpose. Obesity is a highly stigmatizing condition for both adults and children, and both obesity and stigma experiences are negatively related with Health-Related Quality of Life (HRQoL). However, the relations among these constructs have been modeled in different and sometimes inconsistent terms in past research, and have been the object of surprisingly few studies in pediatric populations. The present study addresses this gap by comparing, in a sample of pre-adolescent children, four competing models (i.e., additive, mediation, moderation, and moderated-mediation models) accounting for the role of stigma experiences in the concurrent relation between body weight and HRQoL. Methods: A co…
Non-Desarguian geometries and the foundations of geometry from David Hilbert to Ruth Moufang
2004
Abstract In this work, we study the development of non-Desarguian geometry from David Hilbert to Ruth Moufang. We will see that a geometric model became a complicated interrelation between algebra and geometry.
Step-by-step integration for fractional operators
2018
Abstract In this paper, an approach based on the definition of the Riemann–Liouville fractional operators is proposed in order to provide a different discretisation technique as alternative to the Grunwald–Letnikov operators. The proposed Riemann–Liouville discretisation consists of performing step-by-step integration based upon the discretisation of the function f(t). It has been shown that, as f(t) is discretised as stepwise or piecewise function, the Riemann–Liouville fractional integral and derivative are governing by operators very similar to the Grunwald–Letnikov operators. In order to show the accuracy and capabilities of the proposed Riemann–Liouville discretisation technique and th…
Efficient Synthesis of (P-Chirogenic) o-Boronated Phosphines from sec-Phosphine Boranes
2015
An efficient synthesis of boronated phosphines with an o-phenylene-bridge prepared from sec-phosphine boranes and using benzyne chemistry is reported. Successive reactions of sec-phosphine boranes with n-BuLi and 1,2-dibromobenzene, and then with boron reagents, afford the o-boronatophenylphosphine derivatives in 71% yields. The use of P-chirogenic sec-phosphine boranes leads to the free boronated phosphines with retention of configuration at the P-center after decomplexation. The reaction of P-chirogenic o-boronatophenylphosphine with KHF2 affords the corresponding trifluoroborated phosphine with ee >98%.
Asymmetric tungsten oxide nanobrushes via oriented attachment and Ostwald ripening
2011
Tungsten oxide nanobrushes were synthesized using a solvothermal approach that lead to self-branching in the presence of citric acid and hexadecylamine as surfactants. Our synthetic approach yielded branched nanorods of tungsten oxide in a single synthetic step. Based on our results, we propose a phenomenological pathway for the formation, branching, and assembly of these tungsten oxide brushes. The formation of tungsten oxide brushes proceeds by thermal decomposition of ammonium tungstate in the presence of citric acid and hexadecylamine. The pale blue powder obtained after solvothermal reaction was analyzed by X-ray diffraction (XRD), transmission electron microscopy (TEM) and high-resolu…
Kinetic Monte Carlo modeling of Y2O3 nano-cluster formation in radiation resistant matrices
2018
This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.
Statistical characterization of self-assembled charged nanoparticle structures
2013
We propose a novel approach for description of dynamics of nanostructure formation for a system consisting of oppositely charged particles. The combination of numerical solution of analytical Bogolyubov–Born–Green–Kirkwood–Yvon (BBGKY) type equation set with reverse Monte Carlo (RMC) method allows us to overcome difficulties of standard approaches, such as kinetic Monte Carlo or Molecular Dynamics, to describe effects of long-range Coulomb interactions. Moreover, this allows one to study the system dynamics on realistic time and length scales. We applied this method to a simple short-range Lenard–Jones (LJ)-like three- (3D) and two-dimensional (2D) system combining the long-range Coulomb an…
Optimized Parallel Implementation of Face Detection based on GPU component
2015
Display Omitted An algorithm for face detection has been implemented on CPU.An acceleration of this algorithm on GPU migration.Performance of GPU implementation shows the effectiveness of this implementation.Another optimization method on GPU are operated. Face detection is an important aspect for various domains such as: biometrics, video surveillance and human computer interaction. Generally a generic face processing system includes a face detection, or recognition step, as well as tracking and rendering phase. In this paper, we develop a real-time and robust face detection implementation based on GPU component. Face detection is performed by adapting the Viola and Jones algorithm. We hav…
Gibellina, la città che visse due volte : terremoto e ricostruzione nella Valle del Belice
2019
Il passato di Gibellina Nuova non è Gibellina Vecchia. Le storie delle due città sono profondamente diverse: il terremoto del 1968, che colpì con un’intensità del IX grado della scala Mercalli la Valle del Belice, è stato additato come causa della loro soluzione di continuità, ma i veri fattori che hanno determinato una frattura nella continuità storica vanno ricercati nelle politiche di intervento e nelle utopie urbanistiche che hanno orientato la ricostruzione. Il dopo-terremoto del Belice è stato il banco di prova della Prima Repubblica di fronte alle calamità naturali; dal fallimento delle sperimentazioni urbanistiche operate in vivo nel tessuto sociale, dalla dicotomia tra ricostruzion…