Elementary excitations of the BCS model in the canonical ensemble

6 págs.; 5 figs.; 1 tab. ; PACS number(s): 74.20.Fg, 71.10.Li, 73.21.La, 75.10.JmWe have found the elementary excitations of the exactly solvable BCS model for a fixed number of particles. These turn out to have a peculiar dispersion relation, some of them with no counterpart in the Bogoliubov picture, and unusual counting properties related to an old conjecture made by Gaudin. We give an algorithm to count the number of excitations for each excited state and a graphical interpretation in terms of paths and Young diagrams. For large systems the excitations are described by an effective Gaudin model, which accounts for the finite-size corrections to BCS. ©2003 American Physical SocietyThis work has been supported by Grant No. BFM2000-1320- C02-01/02.Peer Reviewe

Preparation, separation and characterization of gold nanoparticle encapsulated liposomes and their potential application as analytical reagents

III Encuentro sobre Nanociencia y Nanotecnología de Investigadores y Tecnólogos Andaluce

The Importance of Being in Control of Business: Work Satisfaction of Employers, Own-account Workers and Employees

__Abstract__ Self-employed workers can be own-account workers who control their own work or employers who not only are their own boss but also direct others (their employees). We expect both types of self-employed, i.e., own-account workers and employers, to enjoy more independence in determining their work content (type of work) and more flexibility in shaping their work context (e.g., working conditions) compared to paid employees and hence to be more satisfied with their work. Furthermore, we suspect that employers (who can delegate work to their employees and can help them to develop and grow) enjoy even higher levels of work satisfaction compared to both own-account workers (who are their own boss but do not give direction to others) and (non-supervisory) paid employees (who have to obey orders from others within organizational hierarchies). While prior studies typically broadly compare the work satisfaction of self-employed and paid employees, we distinguish employers from own-account workers within the group of self-employed using data from the ECHP for 14 European countries. Our findings indeed show that employers are significantly more satisfied with their work than both own-account workers and paid employees. Additionally, while employers as well as own-account workers enjoy greater procedural utility than (non-supervisory) paid employees stemming from the content and the context of their work, there also seems to be an additional work satisfaction premium for employers

Northern Shrimp (Pandalus borealis, Krøyer) from EU-Spain Bottom Trawl Survey 2018 in NAFO Div. 3LNO

The Spanish Institute of Oceanography carried out in 2018 two bottom trawl surveys in the NAFO Regulatory Area in Division 3NO and 3L during the months of June and August respectively. The results on Northern shrimp (Pandalus borealis) are presented and compared with those from previous surveys from the same series. As recent years in 2018the shrimp catch (0.528 kg.) and estimated biomass (2.413 t.) in Divisions 3NO remain between the lowest of the series, confirming the decrease of shrimp importance from 2004. The Northern shrimp catches in 3L Division have declined from 2009, the shrimp catch (1352 kg.) and biomass estimated in 2018 (7807 t.) remain between the lowest values in the historical series

Northern Shrimp (Pandalus borealis, Krøyer) from Spanish Bottom Trawl Survey 2008 in NAFO Div. 3LNO

The Spanish Institute of Oceanography carried out in 2008 two bottom trawl surveys in the NAFO Regulatory Area in Division 3NO and 3L during the months of June, July and August respectively. The results on Northern shrimp (Pandalus borealis) are presented and compared with those from previous surveys from the same series. In 2008 the catch (24.2 kg) and estimated biomass (143.8 t) confirm the decrease of shrimp importance from 2004 in 3NO. In 3L Division, northern shrimp indices show a general increasing trend a long the whole period. Estimated biomass increased from 2003-2006; then, the values of these indices declined in 2007 (about 10%) and increased again in 2008 (149 265 t). Catch results from the surveys and data analysis are discussed in this paper

Continental shelf zones influenced by the suspended matter flows coming from Cadiz Bay

Due to the diversity of environments and hydrodynamics in Cadiz Bay, it is of interest to study the dynamics of sedimentary exchange between the coastal zones and continental shelf. The most abundant clay minerals on the floor of the continental shelf and Cadiz Bay, and in the particulate matter in suspension, are: illite, smectite, kaolinite + chlorite, and the interstratified clay minerals illite-smectite. The average concentration of suspended matter is 6.5 mg/l, the lowest (1.37 mg/l) being found on the inner shelf and in the inner zones of the bay less affected by currents and surge. The highest values (14 mg/l) are found in the outer bay, consistent with the distribution of muddy facies on the sea floor. The flow paths have been established from the local variations in the mineralogical associations found at the sampling stations, and by means of the alignments of the lowest values of the factor loadings at those stations most affected by the flows. The mineralogical similarity of the components of the clay fraction is related to the mixing action undergone by the components of the suspended matter reaching the bay from various sources, probably produced by the continuous action of the tidal ebb currents flowing from the inner sectors of the bay towards the continental shelf.El estudio de la dinámica de intercambio sedimentario entre las zonas litorales y la plataforma continental es de gran interés en el caso de la bahía de Cádiz, debido a su diversidad de ambientes y situaciones hidrodinámicas. Los minerales de la arcilla más abundantes en los fondos de la plataforma y la bahía, y en la materia en suspensión, son ilita, esmectita, caolinita + clorita e interestratificados ilita-esmectita. La concentración de materia sólida en suspensión indica un contenido promedio de 6,5 mg/l, apareciendo los mínimos (1,37 mg/l) en la plataforma interna y en zonas internas de la bahía no afectadas por corrientes y oleaje. Los valores más altos se dan en la bahía externa (14 mg/l), de acuerdo con la distribución de facies fangosas en el fondo. Las trayectorias de los flujos salientes se han establecido a partir de las variaciones locales de las asociaciones mineralógicas en las diferentes estaciones de muestreo, alineándose los valores más bajos de los factores en las estaciones más afectadas por la acción de los flujos. La similitud mineralógica de los componentes de la fracción arcilla en todos los ambientes se debe a la mezcla de componentes de la materia en suspensión que, desde diferentes fuentes, llegan a la bahía, y es favorecida por la acción de la corriente de reflujo mareal desde el sector más interno de la bahía a la plataforma continental.Instituto Español de Oceanografí

Origen, migraciones y relaciones filogenéticas de las razas ganaderas de Andalucía Oriental

Nuestra región a lo largo de la historia se ha visto invadida, conquistada o visitada por una gran variedad de culturas, que provenientes de Africa, el Mediterráneo, o resto de Europa se instalaron en nuestra tierra. Estos pobladores, desde los antiguos Íberos, pasando por los Fenicios, Tartesos y Romanos hasta llegar a los Árabes y los Castellanos, trajeron consigo unas poblaciones de animales que contribuyeron a la formación de la gran variedad actual de razas autóctonas en Andalucía. En este trabajo realizaremos una descripción del origen de las razas autóctonas ovinas, caprinas, bovinas y porcinas de Andalucía Oriental teniendo en cuenta sus vías de acceso y distribución a lo largo de los distintos periodos históricos y sus relaciones filogenéticas, haciendo un análisis de la influencia de estas razas en el mantenimiento del equilibrio ecológico y poblacional de los espacios donde tradicionalmente se han venido explotando