Search results for "Papers"
showing 10 items of 345 documents
The most 100 cited papers in addiction research on cannabis, heroin, cocaine and psychostimulants. A bibliometric cross-sectional analysis
2021
The number of citations a peer-reviewed article receives is often used as a measure of its importance and scientific impact. This paper identifies, describes and categorizes the highly cited papers in addiction research on cannabis, heroin, cocaine and psychostimulants. Highly cited papers were identified in the Web of Science Core Collection database. Several bibliometric indicators were calculated. Social network analysis was applied to draw groups of authors and institutions with the greatest number of collaborations and co-words. The number of citations for the top 100 cited articles ranged from 649 to 4,672. The articles were published in 40 journals. The subject category Substance Abu…
Local Bonding Influence on the Band Edge and Band Gap Formation in Quaternary Chalcopyrites
2017
Quaternary chalcopyrites have shown to exhibit tunable band gaps with changing anion composition. Inspired by these observations, the underlying structural and electronic considerations are investigated using a combination of experimentally obtained structural data, molecular orbital considerations, and density functional theory. Within the solid solution Cu2ZnGeS4-x Se x , the anion bond alteration parameter changes, showing larger bond lengths for metal-selenium than for metal-sulfur bonds. The changing bonding interaction directly influences the valence and conduction band edges, which result from antibonding Cu-anion and Ge-anion interactions, respectively. The knowledge of the underlyi…
Estudio de las noticias publicadas en prensa del éxodo de enfermeras españolas al Reino Unido
2019
RESUMEN Objetivo Analizar la representación mediática del éxodo de las enfermeras españolas al Reino Unido a través de los diarios de información general. Métodos Análisis de contenido, cuantitativo y cualitativo. Se localizaron con operadores booleanos los documentos publicados en los diarios ABC, El País, El Mundo y La Razón, sobre «emigrantes», «enfermeras» y «sanitarias emigrantes», desde el 1 de enero de 2007 hasta el 31 de diciembre de 2016. El periodo seleccionado se corresponde con el inicio de la crisis económica y concluye con el año de la celebración del referéndum delBrexiten el Reino Unido. Tras aplicar los descriptores se obtuvieron 9559 textos. Una vez eliminado el «ruido» qu…
Study on press coverage about the exodus of Spanish nurses to the United Kingdom
2019
Resumen: Objetivo: Analizar la representación mediática del éxodo de las enfermeras españolas al Reino Unido a través de los diarios de información general. Métodos: Análisis de contenido, cuantitativo y cualitativo. Se localizaron con operadores booleanos los documentos publicados en los diarios ABC, El País, El Mundo y La Razón, sobre «emigrantes», «enfermeras» y «sanitarias emigrantes», desde el 1 de enero de 2007 hasta el 31 de diciembre de 2016. El periodo seleccionado se corresponde con el inicio de la crisis económica y concluye con el año de la celebración del referéndum del Brexit en el Reino Unido. Tras aplicar los descriptores se obtuvieron 9559 textos. Una vez eliminado el «ruid…
[1,2-Bis(diphenyl-phosphan-yl)ethane-κP,P']{2-[(4-nitro-benzoyl-meth-yl)diphenyl-phosphan-yl]phenyl-κC,C'}palladium(II) trifluoro-methane-sulfonate-d…
2011
In the cation of the title compound, [Pd(C(26)H(19)NO(3)P)(C(26)H(24)P(2))]CF(3)O(3)S·CH(2)Cl(2)·0.5C(6)H(14), the Pd(II) atom has a slightly tetra-hedrally distorted square-planar coordination geometry. The PdC(3)P and PdC(2)P(2) five-membered metallacycles adopt envelope and twist conformations, respectively. In the crystal, inter-molecular C-H⋯O hydrogen bonds link cations and anions into a three-dimensional network. The dichloro-methane solvent mol-ecule is disordered over three orientations with a site-occupancy ratio of 0.5/0.3/0.2. The n-hexane solvent mol-ecule has a crystallographically imposed centre of symmetry.
[Aquabis(nitrato-κO)copper(II)]-μ-{bis[5-methyl-3-(pyridin-2-yl)-1H-pyrazol-4-yl]selenide}-[diaqua(nitrato-κO)copper(II)] nitrate monohydrate
2012
In the title binuclear complex, [Cu2(NO3)3(C18H16N6Se)(H2O)3]NO3·H2O, the Cu(II) ions are penta-coordinated in a tetra-gonal-pyramidal geometry. In both cases, the equatorial planes are formed by a chelating pyrazole-pyridine group, a water mol-ecule and a nitrate O atom, whereas the apical positions are occupied by a water mol-ecule for one Cu(II) ion and a nitrate O atom for the other. The organic selenide ligand adopts a trans configuration with respect to the C-Se-C plane. Numerous inter-molecular O-H⋯O and N-H⋯O hydrogen bonds between the coordinating and lattice water mol-ecules, nitrate anions and pyrazole groups are observed. π-π stacking inter-actions between the pyridine rings [av…
[Di-aqua-sesqui(nitrato-κO)hemi(perchlorato-κO)copper(II)]-μ-{bis-[5-methyl-3-(pyridin-2-yl)-1H-pyrazol-4-yl] selenide}-[tri-aqua-(perchlorato-κO)cop…
2013
In the binuclear title complex, [Cu2(ClO4)1.5(NO3)1.5(C18H16N6Se)(H2O)5]NO3·H2O, both Cu(II) ions are hexa-coordinated by O and N atoms, thus forming axially elongated CuO4N2 octa-hedra. The equatorial plane of each octa-hedron is formed by one chelating pyrazole-pyridine fragment of the organic ligand and two water mol-ecules. The axial positions in one octa-hedron are occupied by a water mol-ecule and a monodentately coordinated perchlorate anion, while those in the other are occupied by a nitrate anion and a disordered perchlorate/nitrate anion with equal site occupancy. The pyrazole-pyridine units of the organic selenide are trans-oriented to each other with a C-Se-C angle of 96.01 (14)…
[(1R,4S)-(+)-3-Benzoyl-1,7,7-trimethylbicyclo[2.2.1]heptan-2-olato-κ2 O 2,O 3](η4-norbornadiene)rhodium(I)
2010
In the title complex mol-ecule, [Rh(C(17)H(19)O(2))(C(7)H(8))], the rhodium(I) metal centre is coordinated by the O atoms of a benzoyl-camphorate anion and the C=C bonds of the norbornadiene mol-ecule into a slightly distorted square-planar coordination geometry. The six-membered chelate ring is essentially planar (r.m.s. deviation = 0.0378 Å) and forms a dihedral angle of 31.67 (11)° with the phenyl ring.
[2,6-Bis(di-tert-butylphosphinomethyl)phenyl-κ3P,C1,P′](trifluoroacetato)palladium(II)
2010
The Pd(II) atom in the title compound, [Pd(C(2)F(3)O(2))(C(24)H(43)P(2))], adopts a distorted square-planar geometry with the P atoms in a trans arrangement, forming two five-membered chelate rings. Four intra-molecular C-H⋯O hydrogen bonds occur. The crystal packing reveals one weak inter-molecular C-H⋯O hydrogen bond, which self-assembles the mol-ecules into infinite chains parallel to the b axis.
cis-Bis(2-sulfidopyridine N-oxide)platinum(II).
2007
In the crystal structure of the title complex, [Pt(C5H4NOS)2], the Pt atom is coordinated by two O atoms and two S atoms in a cis configuration, forming a distorted square-planar coordination geometry. The molecule exhibits pseudo-C2v symmetry and is essentially planar, with a maximum deviation from planarity of 0.0124 (2) Å. The dihedral angle between the two pyridine rings is 5.85 (2)°.