Search results for "LIES"
showing 10 items of 1093 documents
L’immagine dei Normanni di Sicilia nella letteratura latina del XII secolo
2016
La dominazione normanna della Sicilia e dell'Italia meridionale, fra XI e XII secolo, è stata letta e interpretata in vario modo dagli scrittori contemporanei, sia quelli di parte bizantina, sia quelli occidentali. In questo saggio, dopo una breve premessa concernente i principali fatti storici e le relative fonti bizantine, ci si concentra sulla disamina di alcuni fra i principali scrittori e poeti che, tra la fine dell'XI e tutto il XII secolo, si sono occupati della dominazione normanna di Sicilia, cercando di individuare e di illustrare, caso per caso, la visione che essi ebbero dei Normanni conquistatori. Si discorre qui, nell'ordine, di Amato da Montecassino, Goffredo Malaterra, Gugli…
The debye-waller factor in spincrossover molecular crystals: a mössbauer study on [FexZn1−x(ptz)6](BF4)2
1995
In a first approximation the Debye-Waller factor (DWF) of molecular crystals is factorized into a molecular and a lattice part:f=f m f l. In the case of spincrossover compounds there is the unique possibility to measure differences of both parts in the two spin states by switching the spin states with the LIESST effect. Measurements of the DWF depending on temperature, γ-ray direction and spin state were performed with57Fe-Mossbauer spectroscopy on three single crystals (R¯3) of the spincrossover system [FexZn1−x(ptz)6](BF4)2 (ptz=1-propyltetrazole), a concentrated sample withx=1 and diluted ones withx=0.30 andx=0.005. The DWF decreases from 10 to 300 K by a factor of ∼ 100 and its anisotro…
From transition magnetic moments to majorana neutrino masses
2005
It is well known that a majorana mass induces a (small) transition magnetic moment. The converse is also true; in this paper we estimate the loop contribution of transition magnetic moments $[\mu]_{\alpha \beta}$ to the neutrino mass matrix $[m]_{\alpha \beta}$. We show that for hierarchical neutrino masses, the contribution of $[\mu]_{e \tau}$ to $[m]_{e \tau}$ can exceed the experimental value of $[m]_{e \tau}$.
Results on radiation hardness of black silicon induced junction photodetectors from proton and electron radiation
2020
Abstract The stability of black silicon induced junction photodetectors under high-energy irradiation was tested with 11 MeV protons and 12 MeV electrons using fluence of 1 ⋅ 10 10 protons/cm2 and dose of 67 krad(Si) for protons and electrons, respectively. The energies and dose levels were selected to test radiation levels relevant for space applications. The degradation was evaluated through dark current and external quantum efficiency changes during (within 1 h after each step) and after (some days after) full irradiation sequences. Furthermore, the black silicon photodetectors were compared to planar silicon induced junction and planar silicon pn-junction photodetectors to assess the co…
Heavy-Ion Induced Charge Yield in MOSFETs
2009
The heavy-ion induced electron/hole charge yield in silicon-oxide versus electric field is presented. The heavy-ion charge yield was determined by comparing the voltage shifts of MOSFET transistors irradiated with 10-keV X-rays and several different heavy ions. The obtained charge yield for the heavy ions is in average nearly an order of magnitude lower than for the X-rays for the entire range of measured electric fields.
Light-induced formation of metastable high-spin states in [Fe(mtz)6](CiO4)2
1988
[Fe(mtz)6](CiO4)2 (mtz=1-methyltetrazole) is a spin crossover compound with two different iron(II) lattice sites. Only one of them (lattice site A) shows thermally induced high spin (HS) ⇌ low spin (LS) spin transition. The LIESST effect (Light-Induced Excited Spin State Trapping) can be observed below 50 K. Complex molecules in B-sites remain in HS state at all temperatures. At ∼ 20 K irradiation with red light causes a partial conversion to another HS species, HS(C), with also practically infinite lifetime.
Spin transition in iron complexes induced by heat, pressure, light and nuclear decay
1988
The phenomenon of temperature-dependent spin transition will be introduced and the numerous chemical and physical influences affecting the spin transition characteristics will be discussed. We shall mainly concentrate on the spin crossover system [Fe(2-pic)3]X2·Sol (2-pic=2-aminomethylpyridine; X=Cl, Br; Sol=C2H5OH, CH3OH) and demonstrate how the behaviour of the spin transition5T2g(Oh)⇌1A1g(Oh) is influenced by substituting the metalion, the non-coordinating anions X, the crystal solvent molecules Sol and by isotopic exchange with H/D and14N/15N. It will also be shown that the spin transition is very susceptible to pressure. A quantitative spin state conversion from low spin to high spin c…
Implicit analytic solutions for a nonlinear fractional partial differential beam equation
2020
Abstract Analytic solutions in implicit form are derived for a nonlinear partial differential equation (PDE) with fractional derivative elements, which can model the dynamics of a deterministically excited Euler-Bernoulli beam resting on a viscoelastic foundation. Specifically, the initial-boundary value problem for the corresponding PDE is reduced to an initial value problem for a nonlinear ordinary differential equation in a Hilbert space. Next, by employing the cosine and sine families of operators, a variation of parameters representation of the solution map is introduced. Due to the presence of a nonlinear term, a local fixed point theorem is employed to prove the local existence and u…
Analīzes metožu attīstīšana nātru tēju elementsastāva noteikšanai
2015
Tā kā organiskā materiāla izpēte ar dažādām analīzes metodēm sagādā grūtības, tad šajā darbā tiks izvērtēta analīzes metožu atbilstība dzelzs, kālija un kalcija satura noteikšanai lielo nātru (Urtica dioica L.) tējās. Dzelzs saturs noteikts ar spektrofotometrijas metodi, kālijs un kalcijs – ar liesmas fotometrijas, bet visi 3 elementi – ar rentgenfluorescenses spektrometrijas metodi. Paraugi sagatavoti tablešu formā, ar sauso vai slapjo mineralizāciju. Spektrofotometrijas metode nav piemērota dzelzs, bet liesmas fotometrija – kalcija satura noteikšanai nātru tējās. Kāliju var noteikt precīzi ar abām metodēm. Rentgenfluorescenses spektrometrija ir piemērota visu minēto elementu noteikšanai. …
Attraction of egg-killing parasitoids toward induced plant volatiles in a multi-herbivore context
2015
In response to insect herbivory, plants emit volatile organic compounds which may act as indirect plant defenses by attracting natural enemies of the attacking herbivore. In nature, plants are often attacked by multiple herbivores, but the majority of studies which have investigated indirect plant defenses to date have focused on the recruitment of different parasitoid species in a single-herbivore context. Here, we report our investigation on the attraction of egg parasitoids of lepidopteran hosts (Trichogramma brassicae and T. evanescens) toward plant volatiles induced by different insect herbivores in olfactometer bioassays. We used a system consisting of a native crucifer, Brassica nigr…