排序方式: 共有28条查询结果,搜索用时 15 毫秒
1.
We introduce a random perturbed version of the classical fidelity and we show that it converges with the same rate of decay
of correlations, but not uniformly in the noise. This makes the classical fidelity unstable in the zero-noise limit. 相似文献
2.
Fiori J Bragieri M Zanotti MC Liverani A Borzatta V Mancini F Cavrini V Andrisano V 《Journal of chromatography. A》2005,1099(1-2):149-156
A previous GC/MS study highlighting the impurity profile of the synthetic pesticide d-allethrin is extended here to validate and confirm the impurities identity through the development of soft ionisation HPLC-MS methods. To accomplish this, we developed a reverse phase LC-MS analysis in gradient elution with two distinct soft ionisation techniques, the atmospheric pressure ionisation with electrospray source (API-ESI) and the chemical ionisation (APCI). A single quadrupole and an ion trap, which allowed the simultaneous determination of the molecular masses and structural information of the impurities by acquisition of collisionally induced (CID) product ions spectrum and in-source fragmentation, were employed as analysers. Single quadrupole and ion trap analysers resulted perfectly matching in the d-allethrin impurity fragmentation patterns. All the main impurities over 0.1% identified by GC/MS were confirmed. Results indicate that the proposed HPLC/MS method was found appropriate to confirm the presence of impurities such as chrysolactone, chloro allethrin derivatives, allethrolone and chrysanthemic acid, excluding their formation under GC/MS strong ionisation condition. 相似文献
3.
4.
G. Mascellani L. Liverani A. Prete G. L. Bergonzini P. Bianchini L. Silvestro 《Journal of carbohydrate chemistry》2013,32(8):1165-1177
Abstract The active site of dermatan sulfate (DS) for heparin cofactor II (HCII) was isolated in a fragment obtained by periodate oxidation, borohydride reduction, mild acid hydrolysis, and SE- and SAX-chromatography of beef mucosal and pig skin DS preparations. Characterization by mass spectrometry, one- and two-dimensional NMR spectroscopy, and HPLC analysis of disaccharides, obtained by exhaustive digestion with chondroitinase-ABC, indicates that the fragment has the prevalent structure 1, GalNAc-4SO3-[IdoA-2SO3-GalNAc-4SO3]4-R, where R is CH(CH2OH)CH(COO?)-OH. 1, is the largest DS fragment thus far isolated containing IdoA2SO3 as the only uronic acid. Its lower activity (30%) with respect to the parent polymeric DS is explainable by Tollefsen model, requiring longer polyanionic chains for formation of ternary complex with thrombin. 相似文献
5.
József Fritz Carlangelo Liverani Stefano Olla 《Communications in Mathematical Physics》1997,189(2):481-496
The set of stationary measures of an infinite Hamiltonian system with noise is investigated. The model consists of particles
moving in with bounded velocities and subject to a noise that does not violate the classical laws of conservation, see [OVY]. Following
[LO] we assume that the noise has also a finite radius of interaction, and prove that translation invariant stationary states
of finite specific entropy are reversible with respect to the stochastic component of the evolution. Therefore the results
of [LO] imply that such invariant measures are superpositions of Gibbs states.
Received: 26 September 1996 / Accepted: 3 January 1997 相似文献
6.
Viviane?BaladiEmail author Carlangelo?Liverani 《Communications in Mathematical Physics》2012,314(3):689-773
We prove exponential decay of correlations for a realistic model of piecewise hyperbolic flows preserving a contact form, in dimension three. This is the first time exponential decay of correlations is proved for continuous-time dynamics with singularities on a manifold. Our proof combines the second author’s version (Liverani in Ann Math 159:1275–1312, 2004) of Dolgopyat’s estimates for contact flows and the first author’s work with Gouëzel (J Mod Dyn 4:91–137, 2010) on piecewise hyperbolic discrete-time dynamics. 相似文献
7.
Cristina Rota Lino Liverani Franco Spelta Giuseppe Mascellani Aldo Tomasi Anna Iannone 《Research on Chemical Intermediates》2006,32(1):73-81
The use of low-molecular-weight heparins (LMWHs) has become common, since compared to unfractionated heparin (UFH), they have
a much longer plasma half-life and lower incidence of side effects. LMWHs are derived from the depolymerization of UFH, obtained
either chemically, physically or enzymatically. We employed electron spin resonance (ESR) spectroscopy to study the depolymerization
of UFH by copper in the presence of hydrogen peroxide. A stable nitroxide radical was detected. This could be generated by
the hydroxyl radical attack either to the N-SO−3 group or to free amino groups present in the UFH preparation. 相似文献
8.
9.
We introduce a model suggested by disordered anharmonic quantum crystals. We then investigate in detail the ergodic properties
exhibited by such a model.
Received: 14 January 2002 / Accepted: 14 October 2002 Published online: 10 February 2003
Communicated by J. L. Lebowitz 相似文献
10.
We present a quantum system composed of infinitely many particles, subject to a nonquadratic Hamiltonian, for which it is possible to investigate the long time behavior of the dynamics and its ergodic properties. We do so both for the KMS states and for a large class of locally normal invariant states, whose very existence is already of some interest. 相似文献