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showing 10 items of 3539 documents
Time propagation of the Kadanoff–Baym equations for inhomogeneous systems
2009
We have developed a time propagation scheme for the Kadanoff-Baym equations for general inhomogeneous systems. These equations describe the time evolution of the nonequilibrium Green function for interacting many-body systems in the presence of time-dependent external fields. The external fields are treated nonperturbatively whereas the many-body interactions are incorporated perturbatively using Phi-derivable self-energy approximations that guarantee the satisfaction of the macroscopic conservation laws of the system. These approximations are discussed in detail for the time-dependent Hartree-Fock, the second Born and the GW approximation.
WDM switching employing a hybrid silicon-plasmonic A-MZI
2012
We demonstrate a system-level evaluation of an A-MZI with 60μm long DLSPP active branches exhibiting more than 14dB extinction ratio. Error-free switching operation is achieved for a 4×10Gb/s incoming WDM data stream with only 13.1mW power consumption.
First demonstration of active plasmonic device in true data traffic conditions: On/off thermo-optic modulation using a hybrid silicon-plasmonic asymm…
2012
We demonstrate the first system-level evaluation of an active plasmonic device in 10Gb/s data traffic conditions. Thermo-optic ON/OFF modulation with 3μs response time and 10mW power consumption is presented using an asymmetric MZI silicon-plasmonic gate.
4-5 gadīgu bērnu matemātisko prasmju veicināšana Numicon pieejā
2022
Darba autors: Evija Pavlovska Darba vadītāja: Dagnija Vigule Nosaukums: “4-5 gadīgu bērnu matemātisko prasmju veicināšana Numicon pieejā” Pētījuma mērķis: petīt 4-5 gadīgu bērnu matemātisko prasmju veicināšanu Numicon pieejā un apkopot ieteikumus 4-5 gadīgu bērnu matemātisko prasmju veicināšanai Numicon pieejā. Hipotēze: : darbs ar Numicon materiāliem veicina matemātisko prasmju apguvi, ja: tiek izvēlētas attīstībai atbilstošas darba organizācijas formas. bērniem tiek nodrošināta praktiskā darbošanās ar Numicon materiāliem. Pētījuma metodes: Teorētiskās: zinātniskās literatūras, dokumentu analīze. Empīriskās pētīšanas metodes: pedagoģisko situāciju modelēšana, novērošana, daļēji strukturē…
Papa Pio XII nella storia della Radiologia
2019
Nel 1933 i Professori della Scuola Medica genovese V. Maragliano, GB. Cardinale e A. Vallebona decisero di proporre come Santo Patrono e Protettore dei Radiologi, San Michele Arcangelo. L’iniziativa dei Grandi Maestri genovesi della Radiologia fu accolta subito dai colleghi con grande entusiasmo. Venne quindi inoltrata richiesta scritta di “supplica” a Papa Pio XII per ottenere il riconoscimento ufficiale da parte della Chiesa cattolica. La scelta dell’Arcangelo Michele fu motivata dai Professori in quanto Santo che, nell’iconografia religiosa, è l’unico a vestire l’armatura, è guardiano del Paradiso e conduce le anime a Dio. Inoltre il Santo rappresenta, il trionfo della luce del bene cont…
EDUCAZIONE FAMILIARE E ORIENTAMENTI DI VALORE
2014
L'educazione familiare ha un nesso costitutivo con l'educazione morale. Questa tesi pedagogica diviene particolarmente evidente nella società liquida, soprattutto in ragione del fatto che, in modo solo in apparenza paradossale, molte esperienze appaiono in essa di tipo inaugurale: terreno propizio per le scelte morali. In generale, è nella famiglia come comunità spirituale che è dato trovare la genealogia della persona; in essa si forma la sensibilità del soggetto, il suo stile emotivo singolare come disposizione verso un cespite di senso, assiologicamente ed eticamente positivo - una risposta al suo fondamentale bisogno di riconoscimento.
Lower semicontinuity of weak supersolutions to the porous medium equation
2013
Weak supersolutions to the porous medium equation are defined by means of smooth test functions under an integral sign. We show that nonnegative weak supersolutions become lower semicontinuous after redefinition on a set of measure zero. This shows that weak supersolutions belong to a class of supersolutions defined by a comparison principle.
δ30Si and δ29Si Determinations on USGS BHVO-1 and BHVO-2 Reference Materials with a New Configuration on a Nu Plasma Multi-Collector ICP-MS
2008
We report silicon isotopic determinations for USGS rock reference materials BHVO-1 and BHVO-2 using a Nu Plasma multi-collector (MC)-ICP-MS, upgraded with a new adjustable entrance slit, to obtain medium resolution, as well as a stronger primary pump and newly designed sampler and skimmer cones ("B" cones). These settings, combined with the use of collector slits, allowed a resolution to be reached that was sufficient to overcome the (NO)-N-14-O-16 and N-14(2) interferences overlying the Si-30 and the Si-28 peaks, respectively, in an earlier set-up. This enabled accurate measurement of both delta Si-30 and delta Si-29. The delta value is expressed in per mil variation relative to the NBS 28…
Biomimetic Mn-catalases based on dimeric manganese complexes in mesoporous silica for potential antioxidant agent
2015
Two new structural and functional models of the Mn-catalase with formula [{Mn(III)(bpy)(H2O)}(μ-2-MeOC6H4CO2)2(μ-O){Mn(III)(bpy)(X)}]X, where X = NO3 (1) and ClO4 (2) and bpy = 2,2'-bipyridine, were synthesized and characterized by X-ray diffraction. In both cases, a water molecule and an X ion occupy the monodentate positions. The magnetic properties of these compounds reveal a weak antiferromagnetic behavior (2J = -2.2 cm(-1) for 1 and -0.7 cm(-1) for 2, using the spin Hamiltonian H = -2J S1·S2) and negative zero-field splitting parameter DMn (-4.6 cm(-1) and -3.0 cm(-1) for 1 and 2, respectively). This fact, together with the nearly orthogonal orientation of the Jahn-Teller axes of the M…