37 Result(s)

Article

Current status and future developments of the ion beam facility at the centre of micro-analysis of materials in Madrid

We report on the current status of the ion beam laboratory of the Centre of Micro-Analysis of Materials at the Autonomous University of Madrid. The 5 MV accelerator facility provides MeV ion beams of any stabl...

A. Redondo-Cubero, M. J. G. Borge, N. Gordillo… in The European Physical Journal Plus (2021)

Article

Ecology and recovery plans for the four Spanish endangered endemic butterfly species

Data compiled during three fieldwork seasons and habitat models provided the tools to produce Species recovery plans for the endangered and endemic butterflies in Spain: Polyommatus violetae, P. golgus, Agriades ...

M. L. Munguira, J. M. Barea-Azcón, S. Castro-Cobo… in Journal of Insect Conservation (2017)

Article

Nonlinear optical waveguides fabricated in Mg-doped LiNbO₃ by swift heavy ion irradiation: anomalous photorefractive damage behavior

Using swift heavy fluorine ion irradiation, we have successfully fabricated optical waveguides in Mg-doped LiNbO₃ substrates. A systematic characterization of these structures has been carried out including refra...

M. Jubera, A. Garcia-Cabañes, M. Carrascosa, J. Olivares in Applied Physics B (2014)

Article

Immune response and survival of refractory cancer patients who received TGF-β2 antisense/GM-CSF gene modified autologous tumor cell (TAG) vaccine

TAG vaccine is a novel ‘triad vaccine’ that involves transfection of autologous tumor with a dual plasmid, TGFβ2 antisense gene and GM-CSF gene. Patients with advanced cancer who failed standard therapy were t...

J Nemunaitis, N Senzer, J Olivares, P Kumar, M Barve, J Kuhn, T Nemunaitis… in Gene Therapy (2013)

Article

Analysis and optimization of propagation losses in LiNbO₃ optical waveguides produced by swift heavy-ion irradiation

The propagation losses (PL) of lithium niobate optical planar waveguides fabricated by swift heavy-ion irradiation (SHI), an alternative to conventional ion implantation, have been investigated and optimized. ...

M. Jubera, J. Villarroel, A. García-Cabañes, M. Carrascosa… in Applied Physics B (2012)

Article

Recrystallization of amorphous nanotracks and uniform layers generated by swift-ion-beam irradiation in lithium niobate

The thermal annealing of amorphous tracks of nanometer-size diameter generated in lithium niobate (LiNbO₃) by Bromine ions at 45 MeV, i.e., in the electronic stop** regime, has been investigated by RBS/C spectr...

M. L. Crespillo, O. Caballero-Calero, V. Joco, A. Rivera, P. Herrero… in Applied Physics A (2011)

Article

Genetic inferences about the population dynamics of codling moth females at a local scale

Estimation of demographic parameters is important for understanding the functioning of natural populations and the underlying ecological and evolutionary processes that may impact their dynamics. Here, we used...

P. Franck, B. Ricci, E. K. Klein, J. Olivares, S. Simon, J.-M. Cornuet… in Genetica (2011)

Article

Photorefractive response and optical damage of LiNbO₃ optical waveguides produced by swift heavy ion irradiation

The photorefractive behaviour of a novel type of optical waveguides fabricated in LiNbO₃ by swift heavy ion irradiation is investigated. First, the electro-optic coefficient r ₃₃ of these ...

J. Villarroel, M. Carrascosa, A. García-Cabañes, O. Caballero-Calero… in Applied Physics B (2009)

Article

Periodic poling of optical waveguides produced by swift-heavy-ion irradiation in LiNbO₃

The generation of periodically poled structures in waveguides prepared by swift-heavy-ion (SHI) irradiation, i.e. in the electronic stop** power regime, has been achieved following two different strategies. ...

O. Caballero-Calero, A. García-Cabañes, M. Carrascosa, F. Agulló-López… in Applied Physics B (2009)

Article

Generation of amorphous surface layers in LiNbO₃ by ion-beam irradiation: thresholding and boundary propagation

The refractive-index profiles induced by high-energy (5 MeV, 7.5 MeV) silicon irradiation in LiNbO₃ have been systematically determined as a function of ion fluence in the range 10¹³–10¹⁵ cm^-2. At variance with i...

J. Olivares, G. García, F. Agulló-López, F. Agulló-Rueda, A. Kling… in Applied Physics A (2005)

Article

Grain size, Grain Uniformity, and (111) Texture Enhancement by Solid-phase Crystallization of F- and C-implanted SiGe Films

The crystallization kinetics and film microstructure of poly-SiGe layers obtained by solid-phase crystallization of unimplanted and C- and F-implanted 100-nm-thick amorphous SiGe films deposited by low-pressur...

A. Rodríguez, J. Olivares, C. González, J. Sangrador… in Journal of Materials Research (2000)

Article

Analysis of the Crystallization Kinetics and Microstructure of Polycrystalline Sige Films by Optical Techniques

In this work, two optical techniques, Raman spectroscopy and ultraviolet reflectance, have been used to characterize the solid phase crystallization kinetics and the microstructure of SiGe films deposited by L...

J. Olivares, P. Martín, A. Rodríguez, J. Sangrador… in MRS Online Proceedings Library (2000)

Article

A novel route to aligned nanotubes and nanofibres using laser-patterned catalytic substrates

We describe the generation of aligned carbon nanotube bundles and films by pyrolysis of solid organic precursors (for example 2-amino-4,6-dichloro-s-triazine, s-triaminotriazine) at 950–1050 °C over laser-pattern...

N. Grobert, M. Terrones, S. Trasobares, K. Kordatos, H. Terrones… in Applied Physics A (2000)

Chapter

Horizontal Gene Transfer in Rhizobia: Ecological Implications

The direct consequences of this phenomenon are loss of inoculation efficacy, as the introduced inoculant strain can be outcompeted by new emerging strains, which could be poor nitrogen-fixers but will occupy m...

J. Sanjuan, J. A. Herrera-Cervera… in Nitrogen Fixation: From Molecules to Crop … (2000)

Chapter

Plant Genes Controlling Development of Two Pea (Pisum sativum L.) Endosymbiotic Systems

Screening of different mutant traits with respect to nodule structure and function has shown that three of 20 legume plant symbiotic genes should be treated as crucial ones for the determination of the fate of...

I. A. Tikhonovich, B. Boesten, A. Y. Borisov… in Nitrogen Fixation: From Molecules to Crop … (2000)

Chapter

Mutation in Pea (Pisum sativum L.) Symbiotic Gene Sym31 Affects the Expression of Rhizobium legumnosarum Bv. Viciae Vf39 Gene dctA and Not that of fixNc

A. Y. Borisov, B. Boesten, J. Sanjuan… in Nitrogen Fixation: From Molecules to Crop … (2000)

Article

Influence of The Alloy Composition on The Thermodynamic Parameters of Nucleation and Growth of SiGe

The influence of the germanium fraction on the parameters of the solid phase crystallization of amorphous silicon-germanium has been studied. Layers of different compositions were deposited by LPCVD at 450 °C ...

J. Olivares, A. Rodríguez, J. Sangrador, T. Rodríguez… in MRS Online Proceedings Library (1999)

Article

A Raman Study of a Metastable Crystalline State in Amorphous SiGe Layers Under cw Laser Illumination: Influence of the Temperature

A metastable crystalline state was observed in amorphous SiGe/Si layers under illumination with a cw laser beam (514.5 nm) with power density below the crystallization threshold. The observation of this state ...

P. Martin, J. Olivares, A. Rodriguez, J. Sangrador… in MRS Online Proceedings Library (1999)