On the 2-point function of the O(N) model

The self-energy of the critical 3-dimensional O(N) model is calculated. The analysis is performed in the context of the Non-Perturbative Renormalization Group, by exploiting an approximation which takes into account contributions of an infinite number of vertices. A very simple calculation yields the 2-point function in the whole range of momenta, from the UV Gaussian regime to the scaling one. Results are in good agreement with best estimates in the literature for any value of N in all momenta regimes. This encourages the use of this simple approximation procedure to calculate correlation functions at finite momenta in other physical situations

Fingerprinting the magnetic behavior of antiferromagnetic nanostructures using remanent magnetization curves

Antiferromagnetic (AF) nanostructures from Co3O4, CoO and Cr2O3 were prepared by the nanocasting method and were characterized magnetometrically. The field and temperature dependent magnetization data suggests that the nanostructures consist of a core-shell structure. The core behaves as a regular antiferromagnet and the shell as a two-dimensional diluted antiferromagnet in a field (2d DAFF) as previously shown on Co3O4 nanowires [Benitez et al., Phys. Rev. Lett. 101, 097206 (2008)]. Here we present a more general picture on three different material systems, i.e. Co3O4, CoO and Cr2O3. In particular we consider the thermoremanent (TRM) and the isothermoremanent (IRM) magnetization curves as "fingerprints" in order to identify the irreversible magnetization contribution originating from the shells. The TRM/IRM fingerprints are compared to those of superparamagnetic systems, superspin glasses and 3d DAFFs. We demonstrate that TRM/IRM vs. H plots are generally useful fingerprints to identify irreversible magnetization contributions encountered in particular in nanomagnets.Comment: submitted to PR

Engineering magnetic domain-wall structure in permalloy nanowires

Using Lorentz transmission electron microscopy we investigate the behavior of domain walls pinned at non-topographic defects in Cr(3 nm)/Permalloy(10 nm)/Cr(5 nm) nanowires of width 500 nm. The pinning sites consist of linear defects where magnetic properties are modified by a Ga ion probe with diameter ~ 10 nm using a focused ion beam microscope. We study the detailed change of the modified region (which is on the scale of the focused ion spot) using electron energy loss spectroscopy and differential phase contrast imaging on an aberration (Cs) corrected scanning transmission electron microscope. The signal variation observed indicates that the region modified by the irradiation corresponds to ~ 40-50 nm despite the ion probe size of only 10 nm. Employing the Fresnel mode of Lorentz transmission electron microscopy, we show that it is possible to control the domain wall structure and its depinning strength not only via the irradiation dose but also the line orientation.Comment: Accepted for publication in Physical Review Applie

Conformations of N-Heterocyclic Carbene Ligands in Ruthenium Complexes Relevant to Olefin Metathesis

The structure of ruthenium-based olefin metathesis catalyst 3 and model π-complex 5 in solution and in the solid state are reported. The N-tolyl ligands, due to their lower symmetry than the traditional N-mesityl substituents, complicate this analysis, but ultimately provide explanation for the enhanced reactivity of 3 relative to standard catalyst 2. The tilt of the N-tolyl ring provides additional space near the ruthenium center, which is consistent with the enhanced reactivity of 3 toward sterically demanding substrates. Due to this tilt, the more sterically accessible face bears the two methyl substituents of the N-aryl rings. These experimental studies are supported by computational studies of these complexes by DFT. The experimental data provides a means to validate the accuracy of the B3LYP and M06 functionals. B3LYP provides geometries that match X-ray crystal structural data more closely, though it leads to slightly less (0.5 kcal mol^(−1)) accuracy than M06 most likely because it underestimates attractive noncovalent interactions

Method of recovering municipal boundary lines in Province of Valencia (Spain) by means of historical cadastral maps

Land demarcation is a fundamental requirement when determining to what extent property owners and public administrations can apply their rights. Just as international boundaries must be clearly marked so that there can be no doubt as to which jurisdiction is to be applied, municipal boundaries must be clearly defined in order to avoid disputes between local administrations. In Spain the Geographical Institute carried out the demarcation of all municipal boundaries at the end of the 19th and beginning of the 20th centuries, defined their limits on cadastral maps and represented them on the 1:50,000 scale National Topographical Map. At the present time, more than a hundred years after this survey, in many cases parts of the original municipal limits have been lost for one reason or another, both on the maps and on the ground itself, and it has now become necessary to take steps to recover them. This paper defines a method of using the municipal councils own historical information to trace original boundary lines. The work included both a study and a series of tests carried out in different municipal areas in the Province of Valencia, Spain. The original reports and field notebooks of the Geographical Institute were used as the basic material of the study, supported by cadastral maps from different periods, as well as historical and contemporary orthophotos to help locate possible boundary markers. GPS techniques were employed to look for, survey and reinstate boundary marker positions.This work has been partially supported by the research project 'The Land Registry as the basic tool for organising spatial information; INSPIRE Directive, spatial data and metadata (II)', DER2011-23321 from the Spanish Government.Femenía Ribera, C.; Benítez Aguado, E.; Mora Navarro, JG.; Martínez Llario, JC. (2014). Method of recovering municipal boundary lines in Province of Valencia (Spain) by means of historical cadastral maps. Survey Review. 46(337):255-266. https://doi.org/10.1179/1752270613Y.0000000081S25526646337Aguña Martín J. 2000.Deslindes de fincas. El topógrafo como técnico indispensable de la determinaci�n de la propiedad. La topografía aplicada a la problemática inmobiliaria.Topografía Aplicada. XVI Cursos de Verano de Laredo. Universidad de Cantabria.Alcázar Molina M. 2003.Catastro Inmobiliario. Centro de Ingeniería Económica (INECO) Editorial Universidad Politécnica de Valencia ref. 2003–2176.Berné Valero J.L and Femenia-Ribera C., C., 2000.Catstro de rústica. Editorial Universidad Politécnica de Valencia ref. 2000–4185, 386.Berné Valero J.L, Femenia-Ribera C, Aznar Bellver J. 2004.Catastro y Valoración Catastral. Editorial Universidad Politécnica de Valencia ref. 2004–532.Berné Valero J.L, Femenia-Ribera C, Benitez-Aguado E. 2008.Catastro en España. Editorial Universidad Politécnica de Valencia ref. 2008–413, 550.Blais, H. (2011). An intra-imperial conflict: the mapping of the border between Algeria and Tunisia, 1881–1914. Journal of Historical Geography, 37(2), 178-190. doi:10.1016/j.jhg.2010.11.006Brumec, M., & Koleša, J. (2011). Land cadastral representation adjustment when making land survey plan. Geodetski vestnik, 55(02), 284-291. doi:10.15292/geodetski-vestnik.2011.02.284-291Capdevila i Subirana J. 2009a.Historia del deslinde de la frontera hispano-francesa. Del tratado de los Pirineos (1659) a los tratados de Bayona (1856-1868). Instituto Geográfico Nacional-Centro Nacional de Información Geográfica, 184.Capdevila i Subirana J. 2009b. Qui va dibuixar la ratlla? Treballs de la Comisión Mixta de Límites (1853–1868).Congrés El Fet Fronterer. Fronteres, relacions, intercanvis.Institut d’Estudis Empordanesos, Figueres.Casey, E. S. (2011). Border versus Boundary at La Frontera. Environment and Planning D: Society and Space, 29(3), 384-398. doi:10.1068/d0410Collier, P. (2009). International Boundary Surveys and Demarcation in the Late 19thand Early 20thCenturies. Survey Review, 41(311), 2-13. doi:10.1179/003962608x325457Cruz Sánchez F. 2010.Líneas límite en la Comunidad Valenciana. Colegio Oficial de Ingenieros Técnicos en Topografía. Valencia.Cruz Sánchez F. 2011.Determinación de líneas límites, Primeras Jornadas de Arquitectura e Ingeniería Civil y Cartográfica de la Comunidad Valenciana. Valencia.Donaldson, J. W. (2008). Pillars and perspective: demarcation of the Belgian Congo–Northern Rhodesia boundary. Journal of Historical Geography, 34(3), 471-493. doi:10.1016/j.jhg.2007.11.005Donaldson, J. W. (2008). Politics and scale in boundary-making: the work of boundary commissions. Journal of Historical Geography, 34(3), 393-396. doi:10.1016/j.jhg.2008.02.001Femenia-Ribera C. 2006. La topografía y la cartografía en los deslindes y servidumbres en España,Biblio 3W: Revista bibliográfica de Geografía y Ciencias Sociales, 10, pp. 100–110, Aviailable at: [accessed 10 July 2013].Femenia-Ribera C. 2009.La Cartografía y su Legislación Territorial. Editorial Universidad Politécnica de Valencia ref. 2009-505, 272.Femenia-Ribera C, Mora-Navarro G, Benitez-Aguado E, Garrido Villén N. 2013. A study and analysis of ways of representing the boundary between adjacent municipal areas as used in different types of maps in Valencia wetland.Scripta Nova.Revista electrónica de geografía y ciencias sociales, to be published.Fernández Pareja M.T and García-Patos Herreros P.J. 2012. International Border Agreements: Spanish-Portuguese Model.X Congreso TopCart 2012: Congreso IberoAmericano de Geomática y Ciencias de la Tierra, Madrid.Forman, G. (2006). Law and the historical geography of the Galilee: Israel’s litigatory advantages during the special operation of land settlement. Journal of Historical Geography, 32(4), 796-817. doi:10.1016/j.jhg.2005.09.004Garrido-Villén, N., Antón-Merino, A., Berné Valero, J. L., & Femenia Ribera, C. (2013). Land surveyors as expert witnesses in real estate litigation matters in Spain. geodetski vestnik, 57(01), 066-084. doi:10.15292/geodetski-vestnik.2013.01.066-084García Cepeda F. 2009.Doctoral Thesis: Optimización de la metodología para la definición, actualización, mantenimiento y aprovechamiento de las líneas límite jurisdiccionales.Departamento de Ingeniería Topográfica y Cartográfica. Universidad Politécnica de Madrid.García Lario J.M and Pérez Casas J.M. 2010.Delimitaciones Territoriales, Centro Nacional de Información Geográfica, Curso Básico sobre el Sistema Cartográfico Nacional. Valencia.Grimalt Servera P. 2001.El Deslinde entre Particulares. Editorial Aranzadi.Kim, M.-A. (2009). The Imaginary Line: A History of the United States and Mexican Boundary Survey, 1848-1857. Hispanic American Historical Review, 89(1), 196-197. doi:10.1215/00182168-2008-077Mañero García A. 2012a.Plan Nacional de Referenciación Geográfica Municipal, Centro Nacional de Información Geográfica. Curso Básico sobre el Sistema Cartográfico Nacional. Valencia.Mañero García A., Piña García F., García Lario J.M and Pérez Casas J.M. 2012b. Actualización de las delimitaciones territoriales en Cantabria,X Congreso TopCart 2012: Congreso IberoAmericano de Geomática y Ciencias de la Tierra.Madrid.Martínez RiveraF., Díez Díaz J., Buitrago M., Olaya G., Ladino A., Duarte E and Mafla E. 2006.Guía para el Deslinde y Amojonamiento, Entidades Territoriales de la República de Colombia. Departamento Nacional de Estadística-DANE, Instituto Geográfico Agustín Codazzi, Colombia, 32.Massó M, Torres M and Jiménez MM. 2011. La recuperació dels límits municipals històrics, Conveni DGAP-ICC (2005-2011,Revista Catalana de Geografia. Revista digital de geografía, cartografía i ciències de la Terra,43, vol. XVI. Available at: [accessed 15 January 2013].Moya Rodríguez M and García-Rodrigo Martín A.M. 2002.Catastro, Valoración y Tributación Inmobiliaria Rústica, Editorial Artemedia Comunicación S.L., p. 454.Piña García F. 2009.Doctoral Thesis: Los Límites Administrativos, el Dominio Público y la zonificación del espacio en la Ordenación del Territorio y el Urbanismo, Análisis y evaluación posicional en Cantabria. Departamento de Ingeniería Geográfica y Técnicas de Expresión Gráfica, Universidad de Cantabria.Pirti, A., Arslan, N., Deveci, B., Aydin, O., Erkaya, H., & Hosbas, R. G. (2009). Real-Time Kinematic GPS for Cadastral Surveying. Survey Review, 41(314), 339-351. doi:10.1179/003962609x451582Pro Ruíz J. 1992.Estado, geometría y propiedad: Los orígenes del Catastro en España: 1715-1941. Centro de Gestión Catastral y Cooperación Tributaria, Ministerio de Economía y Hacienda, p. 419.Pro Ruíz J. 1999.El Catastro desde el punto de vista histórico. XV° Curso de Especialización: Cartografía Catastral Informatizada y Cartografía a grandes escalas.Reguera Rodríguez A.T. 2007. La lucha postal por el territorio.Scripta Nova. Revista electrónica de geografía y ciencias sociales, 237, XI. Aviailable at: [accessed 10 July 2013].Tucci, M., & Giordano, A. (2011). Positional accuracy, positional uncertainty, and feature change detection in historical maps: Results of an experiment. Computers, Environment and Urban Systems, 35(6), 452-463. doi:10.1016/j.compenvurbsys.2011.05.004Urteaga L, Nadal F, Muro JI. 2003. Imperialismo y cartografía: La organización de la Comisión Española del Estado Mayor en Marruecos (1881–1882).Scripta Nova. Revista electrónica de geografía y ciencias sociales, 142, VII. Available at: [accessed 10 July 2013].Urteaga L. 2006. El mapa del norte de Marruecos a escala 1/500·000 y la Conferencia de Algeciras de 1906.Scripta Nova. Revista electrónica de geografía y ciencias sociales, 218, X. Available at: [accessed 10 July 2013].Valcuende del Río J.M and Cardia LM. 2009. Etnografia das Fronteiras Políticas e Sociais na Amazonia Occidental: Brasil, Perú e Bolivia.Scripta Nova. Revista electrónica de geografía y ciencias sociales, 292, XIII. Available at: [accessed 10 July 2013].Vilalta Nicuesa A.E. 2005.Expediente de deslinde y acción de deslinde y amojonamiento, Editorial Bosch, Biblioteca Básica de Práctica Procesal, 17, p. 95

DMI meter: Measuring the Dzyaloshinskii-Moriya interaction inversion in Pt/Co/Ir/Pt multilayers

We describe a field-driven domain wall creep-based method for the quantification of interfacial Dzyaloshinskii-Moriya interactions (DMI) in perpendicularly magnetized thin films. The use of only magnetic fields to drive wall motion removes the possibility of mixing with current-related effects such as spin Hall effect or Rashba field, as well as the complexity arising from lithographic patterning. We demonstrate this method on sputtered Pt/Co/Ir/Pt multilayers with a variable Ir layer thickness. By inserting an ultrathin layer of Ir at the Co/Pt interface we can reverse the sign of the effective DMI acting on the sandwiched Co layer, and therefore continuously change the domain wall (DW) structure from right- to the left-handed N\'{e}el wall. We also show that the DMI shows exquisite sensitivity to the exact details of the atomic structure at the film interfaces by comparison with a symmetric epitaxial Pt/Co/Pt multilayer

Measurement of the ground-state distributions in bistable mechanically interlocked molecules using slow scan rate cyclic voltammetry

In donor–acceptor mechanically interlocked molecules that exhibit bistability, the relative populations of the translational isomers—present, for example, in a bistable [2]rotaxane, as well as in a couple of bistable [2]catenanes of the donor–acceptor vintage—can be elucidated by slow scan rate cyclic voltammetry. The practice of transitioning from a fast scan rate regime to a slow one permits the measurement of an intermediate redox couple that is a function of the equilibrium that exists between the two translational isomers in the case of all three mechanically interlocked molecules investigated. These intermediate redox potentials can be used to calculate the ground-state distribution constants, K. Whereas, (i) in the case of the bistable [2]rotaxane, composed of a dumbbell component containing π-electron-rich tetrathiafulvalene and dioxynaphthalene recognition sites for the ring component (namely, a tetracationic cyclophane, containing two π-electron-deficient bipyridinium units), a value for K of 10 ± 2 is calculated, (ii) in the case of the two bistable [2]catenanes—one containing a crown ether with tetrathiafulvalene and dioxynaphthalene recognition sites for the tetracationic cyclophane, and the other, tetrathiafulvalene and butadiyne recognition sites—the values for K are orders (one and three, respectively) of magnitude greater. This observation, which has also been probed by theoretical calculations, supports the hypothesis that the extra stability of one translational isomer over the other is because of the influence of the enforced side-on donor–acceptor interactions brought about by both π-electron-rich recognition sites being part of a macrocyclic polyether

A Semi-Empirical Model of the Infra-Red Universe

We present a simple model of the infra-red universe, based as much as possible on local observations. We model the luminosity and number evolution of disk and starburst galaxies, including the effects of dust, gas and spectral evolution. Although simple, our approach is able to reproduce observations of galaxy number counts and the infra-red and sub-millimeter extra-galactic backgrounds. It provides a useful probe of galaxy formation and evolution out to high redshift. The model demonstrates the significant role of the starburst population and predicts high star formation rates at redshifts 3 to 4, consistent with recent extinction-corrected observations of Lyman break galaxies. Starbursting galaxies are predicted to dominate the current SCUBA surveys. Their star formation is driven predominantly by strong tidal interactions and mergers of galaxies. This leads to the creation of spheroidal stellar systems, which may act as the seeds for disk formation as gas infalls. We predict the present-day baryonic mass in bulges and halos is comparable to that in disks. From observations of the extra-galactic background, the model predicts that the vast majority of star formation in the Universe occurs at z<5.Comment: 23 pages including 9 figures. To appear in ApJ. Model results available electronically at http://astro.berkeley.edu/~jt/irmodel.htm

Engineering a catabolic pathway in plants for the degradation of 1,2-dichloroethane

Plants are increasingly being employed to clean up environmental pollutants such as heavy metals; however, a major limitation of phytoremediation is the inability of plants to mineralize most organic pollutants. A key component of organic pollutants is halogenated aliphatic compounds that include 1,2-dichloroethane (1,2-DCA). Although plants lack the enzymatic activity required to metabolize this compound, two bacterial enzymes, haloalkane dehalogenase (DhlA) and haloacid dehalogenase (DhlB) from the bacterium Xanthobacter autotrophicus GJ10, have the ability to dehalogenate a range of halogenated aliphatics, including 1,2-DCA. We have engineered the dhlA and dhlB genes into tobacco (Nicotiana tabacum ‘Xanthi’) plants and used 1,2-DCA as a model substrate to demonstrate the ability of the transgenic tobacco to remediate a range of halogenated, aliphatic hydrocarbons. DhlA converts 1,2-DCA to 2-chloroethanol, which is then metabolized to the phytotoxic 2-chloroacetaldehyde, then chloroacetic acid, by endogenous plant alcohol dehydrogenase and aldehyde dehydrogenase activities, respectively. Chloroacetic acid is dehalogenated by DhlB to produce the glyoxylate cycle intermediate glycolate. Plants expressing only DhlA produced phytotoxic levels of chlorinated intermediates and died, while plants expressing DhlA together with DhlB thrived at levels of 1,2-DCA that were toxic to DhlA-expressing plants. This represents a significant advance in the development of a low-cost phytoremediation approach toward the clean-up of halogenated organic pollutants from contaminated soil and groundwater