Search results for "LENI"

La paz desde la perspectiva de la sociedad civil (Europa tiene que hacer su paz y propagarla)

2011

Texto basado en la conferencia pronunciada por José Vidal-Beneyto en el "II Congreso Internacional por la Paz en Europa", el 10 de julio de 1996 en el País Vasco. Publicado póstumamente.

Sensing Chiral Drugs by Using CdSe/ZnS Nanoparticles Capped withN-Acetyl-L-Cysteine Methyl Ester

2013

Chiral quantum dots (QDs), differing in their core or shell size and, consequently, in their optical properties, were synthesized by the treatment of commercially available amine-capped quantum dots with methyl ester N-acetyl-L-cysteine (CysP). Interestingly, their colloidal methanol solutions remain stable for several months. Their NMR and IR spectra were in accordance with CysP binding to the QD surface through two anchoring groups; its thiolate (strongly bound) and the carbonyl group of its ester (weaker bound) group, whereas their circular dichroism (CD) spectra showed a new broad redshifted band, suggesting that the attachment to the QD surface modified the conformational equilibrium t…

Low temperature mobilities of 2-D electrons in indium selenide: Neutral and ionized impurity scattering

1992

Abstract Low temperature mobility of 2-D electrons in indium selenide is calculated, taking into account neutral and ionized impurity scattering. Two-dimensional electric subbands are originated due to quantum size effects, at both sides of thin ϵ-polytype layers, separated by two stacking faults from the bulk γ-InSe. Ionized impurities are in the ϵ-layer and then, spatially separated from 2-D electrons. Neutral impurities are adsorbed to stacking faults in the ϵ-γ interface. A relaxation time for dipole-like neutral impurity scattering is deduced. Calculated mobilities are compared to previous experimental results and the areal concentration of the neutral impurities is so estimated. The i…

Splenic tuberculosis in a patient with Crohn's disease on infliximab: Case report

2010

Synthetic Pathways for New Tubular Transition Metal Hydroxo- and Fluoro-Selenites: Crystal Structures ofM12(X)2(SeO3)8(OH)6(M=Co2+,Ni2+;X= OH−)

1996

The dumortierite-family structuresM12X2(SeO3)8(OH)6(M= Co2+and Ni2+;X= OH−and F−) have been synthesized. The crystal structures of the hydroxo-derivatives have been refined from X?ray powder diffraction data in the space groupP63mc(Z= 1) witha= 12.887(3) A andc= 4.981(4) A (M= Co2+,X= OH−or F−) anda= 12.704(5) A andc= 4.925(6) A (M= Ni2+,X= OH−or F−). Application of the Partial Charge Transference Model allows the understanding of the selenite derivatives crystal chemistry.

Nanostructure Formation on ZnSe Crystal Surface by Electrochemical Etching

2021

The article describes a simple method for nanostructuring the surface of monocrystalline zinc selenide. It is shown that the traditional electrochemical etching of n-ZnSe (111) samples in a concentrated solution of nitric acid leads to the appearance of massive etching pits and small pores on the surface. The dynamics of the process and stages of crystal dissolution has been studied. It is assumed that the porous zinc selenide obtained in this way can be used in optoelectronic structures, as well as as buffer layers for growing zinc oxide.

Adsorption of Alcohols Onto Zinc Selenide (ZnSe) Crystal Surface

2014

Adsorption behaviour of ZnSe, a popular material used in the manufacture of crystals for total internal reflectance techniques was studied for the adsorption of alcohols from dichloromethane solutions using infrared spectrometry. A series of n-alcohols were used in this study. The results show that the integrated area for the hydrogen bonded OH stretchings decrease and suggests that there is a continuous adsorption of alcohol molecules onto the ZnSe crystal by breaking the hydrogen bonds between alcohol molecules in solution.

Bis[3-methyl-5-(pyridin-2-yl)-1H-pyrazol-4-yl] selenide methanol hemisolvate

2014

The asymmetric unit of the title compound, C18H16N6Se·0.5CH3OH, contains two independent molecules of bis[3-methyl-5-(pyridin-2-yl)-1H-pyrazol-4-yl] selenide with similar C—Se—C bond angles [99.30 (14) and 98.26 (13)°], and a methanol molecule of solvation. In one molecule, the dihedral angles between pyrazole and neighbouring pyridine rings are 18.3 (2) and 15.8 (2)°, and the corresponding angles in the other molecule are 13.5 (2) and 8.3 (2)°. In the crystal, the selenide and solvent molecules are linked by classical O—H...N and N—H...N hydrogen bonds, as well as by weak C—H...O and C—H...π interactions, forming a three-dimensional supramolecular architecture.

Plastic deformation of selenium single crystals ina glide and X-ray observation of the induced substructure

1976

In the plastic deformation of trigonal selenium, a glide in the prismatic planes {1010} is found to be thermally activated, as in tellurium. The activation parameters are determined and a value for the maximum activation energy ΔGmax ≈ (0.6 ± 0.1) eV is obtained. The elastic limit increases up to σ ≈ 100 N mm−2 at low temperatures while it is only σ ≈ 1 N mm−2 at room temperature, i.e. in the athermal region. The deformation induced dislocation substructure is studied by X-ray reflection topography at different temperatures from 77 to 300 K in melt-grown single crystals. It is found that glide polygonization occurs forming rough tilt subgrain boundaries in the prismatic planes. In the ather…

CCDC 156129: Experimental Crystal Structure Determination

2001

Related Article: T.Maaninen, T.Chivers, R.Laitinen, G.Schatte, M.Nissinen|2000|Inorg.Chem.|39|5341|doi:10.1021/ic000598b