Study of the charge correlation function in one-dimensional Hubbard heterostructures

We study inhomogeneous one-dimensional Hubbard systems using the density matrix renormalization group method. Different heterostructures are investigated whose configuration is modeled varying parameters like the on-site Coulomb potential and introducing local confining potentials. We investigate their Luttinger liquid properties through the parameter K_rho, which characterizes the decay of the density-density correlation function at large distances. Our main goal is the investigation of possible realization of engineered materials and the ability to manipulate physical properties by choosing an appropriate spatial and/or chemical modulation.Comment: 6 pages, 7 figure

Tendencias en la tecnología del cemento y posibles innovaciones

Hace más de un año que empezamos a preparar estos coloquios. Pecaría de injusticia si mis primeras palabras no fueran para dedicar un cariñoso recuerdo a tres personas, a tres amigos queridos, involucrados en esta preparación que nos han abandonado en el transcurso de este año

Characteristics of Mexican Leather Footwear Industry and its International Trade Activity, Correlation of Productivity, and Competitiveness

This paper focuses on analyzing the globalization effect on the Mexican leather footwear industry at a firm-level. In this work, the analysis of competitiveness is done based on the definition given by the Organization for Economic Cooperation and Development (OECD). They defined it as ‘a measure of a country's advantage or disadvantage in selling its products in international market’. The productivity of the Mexican leather footwear industry was calculated using the Latin American-KLEMS Model that relates gross output to primary (Capital and Labor) and intermediate inputs (Energy, Other intermediate goods, and Services). Furthermore, firms were categorized considering the number of employees, the annual value of production, and the commercial diversification in order to calculate the correlation Pearson coefficient. Firstly, the results show that the correlation of production value with the number of exporting companies is bigger than the correlation of the importing companies. Secondly, that the correlation of Total Productivity Factor (TPF) to exports is strong (0.7028); and finally, that the correlation of Total Productivity Factor (TPF) to imports is also significant (0.6511)

P2Y receptors in bone - anabolic, catabolic, or both?

P2Y receptors, including eight subtypes, are G protein-coupled receptors that can be activated by extracellular nucleotides. Nearly all P2Y receptors are expressed in bone cells, suggesting their involvements in bone physiology and pathology. However, their exact roles in bone homeostasis are not entirely clear. Therefore, this mini review summarizes new research developments regarding individual P2Y receptors and their roles in bone biology, particularly detailing those which execute both anabolic and catabolic functions. This dual function has highlighted the conundrum of pharmacologically targeting these P2Y receptors in bone-wasting diseases. Further research in finding more precise targeting strategy, such as promoting anabolic effects via combining with physical exercise, should be prioritized

Investigating the melt pool properties and thermal effects of multi-laser diode area melting

Diode area melting (DAM) is a new additive manufacturing process that utilises customised architectural arrays of low-power laser diode emitters for high-speed parallel processing of metallic feedstock. The laser diodes operate at shorter laser wavelengths (808 nm) than conventional SLM fibre lasers (1064 nm) theoretically enabling more efficient energy absorption for specific materials. This investigation presents the first work investigating the melt pool properties and thermal effects of the multi-laser DAM process, modelling generated melt pools the unique thermal profiles created along a powder bed during processing. Using this approach process, optimisation can be improved by analysing this thermal temperature distribution, targeting processing conditions that induce full melting for variable powder layer thicknesses. In this work, the developed thermal model simulates the DAM processing of 316L stainless steel and is validated with experimental trials. The simulation indicates that multi-laser DAM methodology can reduce residual stress formation compared to the single point laser scanning methods used during selective laser melting

Element-Specific Depth Profile of Magnetism and Stoichiometry at the La0.67Sr0.33MnO3/BiFeO3 Interface

Depth-sensitive magnetic, structural and chemical characterization is important in the understanding and optimization of novel physical phenomena emerging at interfaces of transition metal oxide heterostructures. In a simultaneous approach we have used polarized neutron and resonant X-ray reflectometry to determine the magnetic profile across atomically sharp interfaces of ferromagnetic La0.67Sr0.33MnO3 / multiferroic BiFeO3 bi-layers with sub-nanometer resolution. In particular, the X-ray resonant magnetic reflectivity measurements at the Fe and Mn resonance edges allowed us to determine the element specific depth profile of the ferromagnetic moments in both the La0.67Sr0.33MnO3 and BiFeO3 layers. Our measurements indicate a magnetically diluted interface layer within the La0.67Sr0.33MnO3 layer, in contrast to previous observations on inversely deposited layers. Additional resonant X-ray reflection measurements indicate a region of an altered Mn- and O-content at the interface, with a thickness matching that of the magnetic diluted layer, as origin of the reduction of the magnetic moment.Comment: 13 pages, 4 figures, supplemental material include

Revisi\uf3n - Serradela amarilla ( Ornithopus compressus ) y serradela rosada (o. sativus): dos nuevas especies de leguminosas forrajeras anuales para la zona Mediterr\ue1nea de Chile

Yellow serradella ( Ornithopus compressus L.) and pink serradella ( Ornithopus sativus Brot.) are two new annual foragelegume species for infertile, acidic, and light texture soils, in dryland areas of the Mediterranean zone of Chile. Seven cultivars of yellow serradella and one cultivar of pink serradella, developed bytheCenter for Legumes in Mediterranean Agriculture (CLIMA),Australia, were characterized. O. compressus presented a high to medium hardseededness (53 to 100% at the beginning of the second growth season), while O. sativus presented a very low hardseededness (4%). A variable range of precocity was detected (108 to 143 days to flowering). The growth habit is semi-erect to erect, flowers are yellow in O. compressus and pink in O. sativus. The dry matter and seed production is comparable, and in some years superior, to that of species of traditional use in these areas, like subterranean clover ( Trifolium subterraneum L.) and hualputra ( Medicago polymorpha L.), standing out serradellas especially for their high production in infertile soils of the interior dry lands of Cauquenes, in the third year of evaluation (2200 to 4200 kg DM ha-1, 650 to 1440 kg seeds ha-1) The available phenological and productive data allow to think that the development of pastures based on serradellas, could mean an important contribution to the improvement of the pastoral production of extensive marginal areas of the non-irrigated Mediterranean land of Chile.La serradela amarilla ( Ornithopus compressus L.) y la serradela rosada ( Ornithopus sativus Brot.) son dos nuevas especies de leguminosas forrajeras anuales para suelos \ue1cidos inf\ue9rtiles, de texturas livianas, en zonas de secano mediterr\ue1neo de Chile. Se caracterizaron siete cultivares de serradela amarilla y uno de serradela rosada, desarrollados por el Centre for Legumes in Mediterranean Agriculture (CLIMA) de Australia. O. compressus present\uf3 una dureza seminal media a alta (53 a 100% al inicio de la segunda temporada de crecimiento), mientras que O. sativus present\uf3 una dureza seminal muy baja (4%). Se detect\uf3 un rango de precocidad variable (entre 108 y 143 d\uedas a floraci\uf3n). El h\ue1bito de crecimiento fue semi-erecto a erecto, flores de color amarillo en el caso de O. compressus y rosadas en el caso de O. sativus. La producci\uf3n de materia seca y de semillas fue comparable, y en algunos a\uf1os superior, al de las especies de uso tradicional en estas zonas, como tr\ue9bol subterr\ue1neo ( Trifolium subterraneum L.) y hualputra ( Medicago polymorpha L.), destac\ue1ndose las serradelas por su alta producci\uf3n, especialmente en suelos inf\ue9rtiles del secano interior de Cauquenes, al tercer a\uf1o de evaluaci\uf3n (2200-4200 kg MS ha-1, 650-1440 kg semilla ha-1). Los antecedentes de fenolog\ueda y comportamiento productivo permiten vislumbrar que el desarrollo de praderas en base a serradelas, podr\ueda significar un importante aporte al mejoramiento de la producci\uf3n pastoral de extensas \ue1reas marginales del secano mediterr\ue1neo de Chile