Search results for "53"

Molecular self-assembly on an insulating surface: interplay between substrate templating and intermolecular interactions

2012

We report on molecular self-assembly of biphenyl-4,4'-dicarboxylic acid (BPDCA) on CaCO3(10 (1) over bar4) under ultra-high vacuum conditions. Two-dimensional, ordered islands are obtained upon deposition at room temperature, coexisting with a streaky structure that is ascribed to individual, mobile molecules forming a two-dimensional gas-like phase. High-resolution non-contact atomic force microscopy (NC-AFM) images of the molecular islands reveal an ordered inner structure that is dominated by rows of molecules aligned side by side running along the [(42) over bar 61] crystallographic direction. A detailed analysis of these rows exhibits inter-row distances that are multiples of the calci…

Erratum: “Nanoscale x-ray imaging of spin dynamics in yttrium iron garnet” [J. Appl. Phys. 126, 173909 (2019)]

2021

Dynamic heterogeneity in supercooled ortho-terphenyl studied by multidimensional deuteron NMR

1996

Using deuteron NMR, we have studied molecular reorientation rates and rate exchange processes in supercooled ortho-terphenyl. We monitor the re-equilibration of differently selected subensembles through four-time stimulated echo experiments. A comparison of the two-time with the four-time echoes suggests that the characteristic time scales for reorientation and dynamical exchange are relatively similar. The four-time correlation functions were described using various multi-state rate exchange models.

Lifetime measurement of neutron-rich even-even molybdenum isotopes

2017

D. Ralet et al. -- 11 pags., 10 figs., 3 tabs.

Guardia y custodia compartida impuesta

2018

Cuando una pareja con hijos comunes menores de edad deja de convivir surge la necesidad de determinar las reglas o normas por las que se regirá la nueva situación familiar. Estas normas pueden ser de carácter económico o personal. Entre las personales, y una sobre las que más les cuesta decidir a los progenitores, es la relativa al cuidado de los hijos y a cómo se va a dar continuidad a las relaciones con ellos una vez se haya producido la separación. Lo mejor sería que los propios progenitores pudieran llegar a un acuerdo al respecto ya que ellos son los que mejor conocen a sus hijos y los mejores conocedores de la situación que están viniendo. Pero en defecto de acuerdo será necesario det…

1,4 dihidropiridīnu atvasinājumu un cilvēka seruma albumīna mijiedarbības izpēte, izmantojot spektroskopiskās metodes

2017

1,4 dihidropiridīnu atvasinājumi ir ļoti perspektīvi savienojumi. Pēc jaunāko pētījumu datiem, 1,4 dihidropiridīnu atvasinājumiem piemīt antimutagēnas īpašības, kā arī DNS reparāciju veicinošas spējas. Pašlaik šie savienojumi tiek ļoti plaši pētīti. Savukārt cilvēka seruma albumīns ir transportproteīns, kas transportē hormonus, taukskābes, medikamentus, un kā viena no galvenajām īpašībām ir koloīdosmotiskā spiediena uzturēšana. Darba mērķis bija analizēt 1,4 dihidropiridīnu atvasinājumu un cilvēka seruma albumīna mijiedarbību, izmantojot spektroskopiskās metodes. Lai pētītu cilvēka seruma albumīna un 1,4 DHP atvasinājumu mijiedarbību izmantota spektrofluorimetrija, jo tā ir vienkārša, jutīg…

¿Quién decide qué y cómo? el conflicto en torno a la participación ciudadana en el contexto del desarrollo de la iniciativa urbana: Cuenca-San Antón …

2018

This article describes the main results of an ethnographic study on citizen participation carried out in the context of the development of the Urban Initiative (2007-2015): Cuenca-Barrio de San Antón. Managed by the City Council of Cuenca and financed by the European Regional Development Funds (FEDER) under the Ministry of Economy and Finance at the Government of Spain The results of the research show how in the context of the application of neoliberal policies, citizen participation becomes the trigger for new conflicts between institutions and citizens. In this sense, it is worth noting how, in practice, institutions in their capacity as experts and not willing to dis-empower themselves, …

Upper limits on the isotropic gravitational-wave background from Advanced LIGO and Advanced Virgo's third observing run

2021

We report results of a search for an isotropic gravitational-wave background (GWB) using data from Advanced LIGO's and Advanced Virgo's third observing run (O3) combined with upper limits from the earlier O1 and O2 runs. Unlike in previous observing runs in the advanced detector era, we include Virgo in the search for the GWB. The results are consistent with uncorrelated noise, and therefore we place upper limits on the strength of the GWB. We find that the dimensionless energy density $\Omega_{\rm GW}\leq 5.8\times 10^{-9}$ at the 95% credible level for a flat (frequency-independent) GWB, using a prior which is uniform in the log of the strength of the GWB, with 99% of the sensitivity comi…

Cuando la historia está presente: Argumentos a favor de la sociología histórica

2019

Sociology and history have maintained a discontinuous relationship and a permanent discussion. Classical sociology is intrinsically historical, but after the first theoretical synthesis the dialogue between both disciplines was extinguished and it has often been necessary to defend the need for the historical view in sociology from the margins of the dominant paradigm. However, as a specialty or subdiscipline, historical sociology has consolidated its own academic space and a strong theoretical, methodological and conceptual body. In Spain this process of institutionalization has not yet success. In this article we expose a few arguments in defense of historical sociology, both theoretical …

Representações sociais, sens pratique, poder simbólico e o processo de construção do ser docente

2019

A partir de las elaboraciones teóricas de los fundadores del campo de investigación de las representaciones sociales, se pretende avanzar en la construcción de un diálogo entre esta teoría y la praxis social de Pierre Bourdieu, centrándose en la relación entre las representaciones sociales, la praxis sensorial (como manifestación del hábito) y el poder simbólico, dimensión ausente en el modelo moscoviciano. La base empírica a partir de la cual se desarrollan las reflexiones presentes en este artículo se apoya en investigaciones realizadas sobre el proceso de construcción del ser docente, en la realidad de algunas ciudades del nordeste brasileño. En este sentido, se destaca lo que se cree qu…