178,870 research outputs found
Photoelectron spectroscopy for surface analysis: X-ray and UV excitation
No full textPodeu consultar el llibre complet a: http://hdl.handle.net/2445/32166This article summarizes the basic principles of photoelectron spectroscopy for surface analysis, with examples of applications in material science that illustrate the capabilities of the related techniques
El antimaritenismo de Rafael Calvo Serer a través de la revista Arbor (1944-1953)
No full textThis article examines the construction of a political-cultural project in the magazine Arbor in the early years of Franco’s dictatorship. Rafael Calvo Serer, the journal’s editor (1951-1953), established Arbor’s monarchical and traditionalist ideology in contrast to the notion of the new Christendom defended by Jacques Maritain. Finally, it analyses the tactics Calvo Serer deployed to protest against the cultural project of Joaquín Ruiz-Giménez, Minister of Education from 1951 to 1956.En este artículo se trata de la construcción de un proyecto político-cultural a través de la revista Arbor en los primeros años del franquismo. El director de Arbor (1951-1953), Rafael Calvo Serer, formó un pensamiento tradicionalista y monárquico contrario a la idea de nueva cristiandad defendida por Jacques Maritain. Por último, se analizan las tácticas empleadas por Rafael Calvo Serer para desestabilizar el proyecto cultural de Joaquín Ruiz-Giménez, ministro de Educación del gobierno de Franco entre 1951 y 1956
Welfare implications of Calvo vs. Rotemberg pricing assumptions
No full textThis paper compares the welfare implications of two widely used pricing assumptions in the New-Keynesian literature: Calvo-pricing vs. Rotemberg-pricing. We show that despite the strong similarities between the two assumptions to a first order of approximation, in general they might entail different welfare costs at higher order of approximation. In the special case of non-distorted steady state, the two pricing assumptions imply identical welfare losses to a second order of approximation. JEL Classification: E3, E5Calvo price adjustment, inflation, Rotemberg price adjustment, second-order approximation, Welfare
Summa philosophiae [Manuscrito] / Ruiz
No full textSignatura: Ms 559427 f. : il. ; 20 cmLatínFrei Bernardo Ruiz tomou o hábito en San Martiño de Santiago en 1716. Foi catedrático da Universidade de Santiago e Abade de San Martiño de 1757 a 1759Foliación antiga a tintaNa f. 1 debuxo a pluma representando á Virxe de Monserrat, na f. final orlas e debuxos a pluma enmarcando a dataEncadernación en pergameoManuscrito procedente do Mosteiro de San Martiño Pinario (Santiago de Compostela, A Coruña
Calvo, Andrea
No full textLa voce dedicata ad Andrea Calvo in "Dizionario dei tipografi degli editori italiani. Il Cinquecento. Vol. 1. A-F" a cura di Marco Menato, Ennio Sandal, Giuseppina Zappella. Milano, Editrice bibliografica, 199
Borehole modelling: a comparison between a steady-state model and a novel dynamic model in a real ON/OFF GSHP operation
No full textThe correct design and optimization of complex energy systems requires the ability to reproduce the dynamic thermal behavior of each system component. In ground source heat pump (GSHP) systems, modelling the borehole heat exchangers (BHE) dynamic response is especially relevant in the development of control strategies for energy optimization purposes. Over the last years, several models have been developed but most of them are based on steady state approaches, which makes them unsuitable for short-term simulation purposes. In fact, in order to accurately predict the evolution of the fluid temperatures due to the ON/OFF cycles of the heat pump, it is essential to correctly characterize the dynamic response of BHE for very short time periods. The aim of the present paper is to compare the performance of an analytical steady-state model, available in TRNSYS environment (Type 557), with a novel short-term dynamic model. The new dynamic model is based on the thermal-network approach coupled with a vertical discretization of the borehole which takes into account both
the advection due to the fluid circulating along the U-tube, and the heat transfer in the borehole
and in the ground. These two approaches were compared against experimental data collected from a real GSHP system installed at the Universitat Polit ècnica de Val ència. The analysis was performed comparing the outlet temperature profiles predicted by both models during daily standard ON/OFF operating conditions, both in heating and cooling mode, and the between both approaches were highlighted. Finally, the obtained results have been discussed focusing on the potential impact that the differences found in the prediction of the temperature evolution could have in design and optimization of GSHP systems.De Rosa, M.; Ruiz Calvo, F.; Corberán Salvador, JM.; Montagud Montalvá, CI.; Tagliafico, L. (2014). Borehole modelling: a comparison between a steady-state model and a novel dynamic model in a real ON/OFF GSHP operation. Journal of Physics: Conference Series. 547:1-10. doi:10.1088/1742-6596/547/1/012008S11054
Medionops Sanchez-Ruiz & Brescovit 2017
No full textGenus Medionops Sánchez-Ruiz & Brescovit, 2017 Updated key to the species of Medionops Sánchez-Ruiz & Brescovit, 2017 1. Abdomen dorsally with remarkable pattern of gray chevrons or stains (Figs 1A, C, 2A, C, 3A).... 2 – Abdomen dorsally with unremarkable pattern of very fine gray chevron lines, almost unnoticeable (Sánchez-Ruiz & Brescovit 2017: figs 17a–b, 20a)........................................................................ 10 2. Abdomen dorsally with five pairs of irregular dark gray stains forming two longitudinal bands (Sánchez-Ruiz & Brescovit 2017: figs 18a–b, 10a).......................................................................... 3 – Abdomen dorsally with five whitish gray chevron stripes, which decrease in size towards the posterior part of abdomen (Figs 1A, C, 2A, C, 3A)......................................................................... 4 3. Dorsal irregular dark gray stains on abdomen very close to each other, almost touching (Sánchez-Ruiz & Brescovit 2017: fig. 18a–b); crista very short; body more than 5 mm total length.................................................................................................... M. simla (Chickering, 1967) – Dorsal irregular dark gray stains on abdomen widely separated from each other, not touching (Sánchez-Ruiz & Brescovit 2017: fig. 10a); crista absent (Sánchez-Ruiz & Brescovit 2017: fig. 9k); body less than 3 mm total length.............................. M. claudiae Sánchez-Ruiz & Brescovit, 2017 4. Gladius absent (Sánchez-Ruiz & Brescovit 2017: figs 11c–d, F, 13b–c).................................................................................................................................. M. murici Sánchez-Ruiz & Brescovit, 2017 – Gladius present (Dupérré 2014: fig.4; Sánchez-Ruiz & Brescovit 2017: figs 3g, 9k, 15e).............. 5 5. Crista short but noticeable (Sánchez-Ruiz & Brescovit 2017: fig. 3g, j), reaching at least ¼ or 1 / of 5 metatarsal length............................................................................................................................... 6 – Crista unnoticeable (Sánchez-Ruiz & Brescovit 2017: fig. 15e–f), only 1 / or less of metatarsal 6 length, or absent................................................................................................................................ 7 6. Males embolus tip with several blade–shaped projections (Sánchez-Ruiz & Brescovit 2017: fig. 2j– l); female posterior plate with internally projected median septum (Sánchez-Ruiz & Brescovit 2017: fig. 4j–l)......................................................................... M. blades Sánchez-Ruiz & Brescovit, 2017 – Males with smooth embolus tip, without projections (Sánchez-Ruiz & Brescovit 2017: fig. 7d–e); female posterior plate without internally projected median septum (Sánchez-Ruiz & Brescovit 2017: fig. 7g –i).................................................................................................... M. cesari (Dupérré, 2014) 7. Abdomen dorsally with pattern of five large, wide whitish gray chevrons, which reach the lateral whitish gray spots (Figs 2A, C, 3A), ventrally with a pair of longitudinal stripes occupying only the posterior third of the abdomen (Figs 2B, D, 3B); males with bulb greater than patella length (Fig. 2E–F)........................................................................................................................................ 8 – Abdomen dorsally with pattern of five small, narrow whitish gray chevrons, that never reach the lateral whitish gray spots (Figs 4A, C, 5A), ventrally without a pair of longitudinal stripes (Figs 4B, D, 5B); males with bulb equal to or smaller than the patella length (Fig. 4E–F)............................. 9 8. Embolus slightly curved anteriorly, tip with accentuated curvature (Fig. 2E–F)..................................................................................................................................... M. carolinae sp. nov. (only males) – Embolus strongly angled at base and slightly sinuous (Figs 3C–D, 7C), tip almost straight (Fig. 3C– D)....................................................................................................... M. cauca sp. nov. (only males) 9. Embolus more than 3 × the maximum tegular width, tip pointed (Fig. 4E–F)....................................................................................................................................... M. luiscarlosi sp. nov. (only males) – Embolus less than 3 × the maximum tegular width, tip truncated (Fig. 5C–D)...................................................................................................................................... M. santarosa sp. nov. (only males) 10. Crista short but noticeable, not reaching one fourth of metatarsal length; body more than 4.5 mm total length;males with embolus length more than3×the maximum diameter of the tegulum(Sánchez-Ruiz & Brescovit 2017: fig. 19g –h), known only from Venezuela M. tabay Sánchez-Ruiz & Brescovit, 2017 – Crista unnoticeable (Sánchez-Ruiz & Brescovit 2017: fig. 15d–f); body less than 3.5 mm total length; males with embolus length over less than 3 × the maximum diameter of the tegulum (Sánchez-Ruiz & Brescovit 2017: fig. 16a–b), known only from southeast coast of Brazil.......................................................................... M. ramirezi Sánchez-Ruiz & Brescovit, 2017Published as part of Martínez, Leonel, Sánchez-Ruiz, Alexander & Bonaldo, Alexandre B., 2021, The spider genus Medionops Sánchez-Ruiz & Brescovit (Araneae: Caponiidae) in Colombia, with the description of four new species, pp. 61-79 in European Journal of Taxonomy 773 on pages 63-64, DOI: 10.5852/ejt.2021.773.1511, http://zenodo.org/record/553638
Coupling short-term (B2G model) and long-term (g-function) models for ground source heat exchanger simulation in TRNSYS. Application in a real installation
No full textGround-source heat pump (GSHP) systems represent one of the most promising techniques for heating and cooling in buildings. These systems use the ground as a heat source/sink, allowing a better efficiency thanks to the low variations of the ground temperature along the seasons. The ground-source heat exchanger (GSHE) then becomes a key component for optimizing the overall performance of the system. Moreover, the short-term response related to the dynamic behaviour of the GSHE is a crucial aspect, especially from a regulation criteria perspective in on/off controlled GSHP systems. In this context, a novel numerical GSHE model has been developed at the Instituto de Ingeniería Energética, Universitat Politècnica de València. Based on the decoupling of the short-term and the long-term response of the GSHE, the novel model allows the use of faster and more precise models on both sides. In particular, the short-term model considered is the B2G model, developed and validated in previous research works conducted at the Instituto de Ingeniería Energética. For the long-term, the g-function model was selected, since it is a previously validated and widely used model, and presents some interesting features that are useful for its combination with the B2G model. The aim of the present paper is to describe the procedure of combining these two models in order to obtain a unique complete GSHE model for both short- and long-term simulation. The resulting model is then validated against experimental data from a real GSHP installation
Experimental validation of a short-term Borehole-to-Ground (B2G) dynamic model
No full textThe design and optimization of ground source heat pump systems require the ability to accurately reproduce the dynamic thermal behavior of the system on a short-term basis, specially in a system control perspective. In this context, modeling borehole heat exchangers (BHEs) is one of the most relevant and difficult tasks. Developing a model that is able to accurately reproduce the instantaneous response of a BHE while keeping a good agreement on a long-term basis is not straightforward. Thus, decoupling the short-term and long-term behavior will ease the design of a fast short-term focused model. This work presents a short-term BHE dynamic model, called Borehole-to-Ground (B2G), which is based on the thermal network approach, combined with a vertical discretization of the borehole.The proposed model has been validated against experimental data from a real borehole located in Stockholm, Sweden. Validation results prove the ability of the model to reproduce the short-term behavior of the borehole with an accurate prediction of the outlet fluid temperature, as well as the internal temperature profile along the U-tube
Tartamura huao Bustamante & Ruiz 2017
No full textTartamura huao Bustamante & Ruiz, 2017 Tartamura huao Bustamante & Ruiz, 2017: 328, figs 3, 8G, 20–21 (Holotype Ƌ: ECUADOR: Orellana: Yasuní Reserve Station Area, Station area, 0.674°S, 76.397°W, 210–280 m a.s.l., leg. W.P. Maddison, E. Piasick & M. Vega, 8–9.VIII.2011, QCAZ—re–examined). Description and diagnosis. See Bustamante & Ruiz (2017). Other material examined (new records). ECUADOR: Napo: Parque Nacional Napo-Galeras, Road Tena- Loreto, 0.7333333°S, 77.591305°W, ca. 1105 m a.s.l., leg. M. Ramírez, C. Grismado, M. Izquierdo & F. Labarque (PBI Expedition), 27.XI.2009 (hand-collected), 1Ƌ (MACN-Ar 38690); Cantón Tena, Parroquia Puerto Napo, Estación Biológica Jatun Sacha, 1.0659722°S, 77.616722°W, ca. 410 m a.s.l., leg. C. Grismado & F. Labarque (PBI Expedition), 1–5.XII.2009 (selva húmeda, hand-collected, at night), 1Ƌ (MACN-Ar 37768). Sucumbíos: Reserva Faunística Cuyabeno, Laguna Grande [=Lago Cuyabeno], Neotropic cabins, camp area and trail to Sendero La Hormiga, 0.0056°S, 76.1770°W, leg. W.P. Maddison, 22–26.IV.1994 (tree trunks), 1♀ (UBC-SEM). Distribution. Known only from a few localities in Sucumbíos, Orellana and Napo, Ecuador.Published as part of Bustamante, Abel A. & Ruiz, Gustavo R. S., 2020, New species and records of thiodinines from North and South America (Araneae Salticidae: Salticinae: Thiodinini), pp. 115-140 in Zootaxa 4899 (1) on pages 123-124, DOI: 10.11646/zootaxa.4899.1.6, http://zenodo.org/record/440075
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