Search results for "AMPs"

Evaporation of Near-Extremal Reissner-Nordström Black Holes

2000

The formation of near-extremal Reissner-Nordstrom black holes in the S-wave approximation can be described, near the event horizon, by an effective solvable model. The corresponding one-loop quantum theory remains solvable and allows to follow analytically the evaporation process which is shown to require an infinite amount of time.

Understorey plant and soil responses to disturbance and increased nitrogen in boreal forests

2009

Question: How do N fertilization and disturbance affect the understorey vegetation, microbial properties and soil nutrient concentration in boreal forests? Location: Kuusamo (66°22′N; 29°18′E) and Oulu (65°02′N; 25°47′E) in northern Finland. Methods: We conducted a fully factorial experiment with three factors: site (two levels), N fertilization (four levels) and disturbance (two levels). We measured treatment effects on understorey biomass, vegetation structure, and plant, soil and microbial N and C concentrations. Results: The understorey biomass was not affected by fertilization either in the control or in the disturbance treatment. Fertilization reduced the biomass of deciduous Vacciniu…

Effects of artificial plant cover on plant colonization of a bare peat surface

1992

. This paper describes the effect of artificial plant cover on plant colonization of a bare peat surface, resulting from peat harvesting. Plant species colonization was compared on plots supplied with plastic models simulating Vaccinium vitis-idaea plants and plots without this artificial cover. After two growing seasons, species composition and total biomass of the established plant cover were similar in the two plot types. However, the number of established seedlings in the plots with artificial cover was significantly higher than that in the plots without cover. Out of 13 species observed four differed significantly in their performance on the two plot types. Betula spec. had both higher…

From resurgent functions to real resummation through combinatorial Hopf algebras

2014

Pas de résumé en anglais.

Campsite choice and the camping tourism experience: Investigating decisive campsite attributes using relevance-determinance analysis

2017

Abstract Camping tourism represents a growing part of the overall tourism industry. Despite this fact, this form of tourism has so far been rather neglected by tourism and hospitality research. Using a case study of a major campsite operator in the coastal part of Croatia, this study thus aims to contribute to the understanding of this specific tourist segment. In particular, a relevance-determinance analysis is conducted to reveal most decisive attributes for campsite choice, on the one hand, and for the actual campsite experience, on the other hand. Overall, the results provide valuable insight to practitioners, especially for the purposes of campsite marketing and experience management.

En el Campo de asesinos de Dachau : (cuatro semanas en poder de los bandidos pardos)

High-Frequency Polarization Variability from Active Galactic Nuclei

2021

The linear polarization of non-thermal emission encodes information about the structure of the magnetic fields, either from the region where the emission is produced (i.e., the intrinsic polarization angle) and/or from the screens of magnetized plasma that may be located on its way towards Earth (i.e., the effect of Faraday rotation). In addition, the variability timescale of the polarized emission, or its Faraday rotation, can be used to estimate the size of the region where the emission (or the Faraday rotation) originates. The observation of polarized emission from active galactic nuclei (AGN) and, in particular, its time evolution, also provides information about the critical role that …

Dipolar Rings of Microscopic Ellipsoids: Magnetic Manipulation and Cell Entrapment

2016

We study the formation and dynamics of dipolar rings composed by microscopic ferromagnetic ellipsoids, which self-assemble in water by switching the direction of the applied field. We show how to manipulate these fragile structures and control their shape via application of external static and oscillating magnetic fields. We introduce a theoretical framework which describes the ring deformation under an applied field, allowing to understand the underlying physical mechanism. Our microscopic rings are finally used to capture, entrap and later release a biological cell via magnetic command, i.e. performing a simple operation which can be implemented in other microfluidic devices which make us…

Magnetic functionalities in MOFs: from the framework to the pore

2017

In this review, we show the different approaches so far developed to prepare Metal-Organic Frameworks (MOFs) presenting electronic functionalities, with particular attention to magnetic properties. We will cover the chemical design of the framework necessary for the incorporation of different magnetic phenomena, as well as the encapsulation of functional species in the pores leading to hybrid multifunctional MOFs combining an extended lattice with a molecular lattice.

Fibre Bragg gratings tuned and chirped using magnetic fields

1997

The authors report on the use of magnetic fields in conjunction with magnetostrictive materials for tuning and chirping optical fibre Bragg gratings. The Bragg wavelength shifts as a consequence of the strain induced in the fibre by a magnetostrictive rod when a magnetic field is applied. A tuning range of 1.1 nm has been achieved by a magnetic field of 103 mT and the grating has been chirped by applying non-uniform magnetic fields.