Spin-orbit splitting and the tensor component of the Skyrme interaction

We study the role of the tensor term of the Skyrme effective interactions on the spin-orbit splittings in the N=82 isotones and Z=50 isotopes. The different role of the triplet-even and triplet-odd tensor forces is pointed out by analyzing the spin-orbit splittings in these nuclei. The experimental isospin dependence of these splittings cannot be described by Hartree-Fock calculations employing the usual Skyrme parametrizations, but is very well accounted for when the tensor interaction is introduced. The capability of the Skyrme forces to reproduce binding energies and charge radii in heavy nuclei is not destroyed by the introduction of the tensor term. Finally, we also discuss the effect of the tensor force on the centroid of the Gamow-Teller states.Comment: Submitted to Phys. Lett.

Probabilistic Forecasting in Day-Ahead Electricity Markets: Simulating Peak and Off-Peak Prices

In this paper we include dependency structures for electricity price forecasting and forecasting evaluation. We work with off-peak and peak time series from the German-Austrian day-ahead price, hence we analyze bivariate data. We first estimate the mean of the two time series, and then in a second step we estimate the residuals. The mean equation is estimated by OLS and elastic net and the residuals are estimated by maximum likelihood. Our contribution is to include a bivariate jump component on a mean reverting jump diffusion model in the residuals. The models' forecasts are evaluated using four different criteria, including the energy score to measure whether the correlation structure between the time series is properly included or not. In the results it is observed that the models with bivariate jumps provide better results with the energy score, which means that it is important to consider this structure in order to properly forecast correlated time series.Comment: 30 pages, 11 figures, 3 tables and Accepted in International Journal of Forecastin

Neska kirolarien egoera eskola garaitik goi mailako txapelketeraino

33 p. : il. - E-mail del autor: [email protected] eskubideak aldarrikatuz, mugimendu feministek bide latza ibili dute. Urte askotan zehar, eta gaur egun ere, gizarteak barneratuta duen matxismoaren aurka borrokatu da, gehiengoaren ideal eta estereotipoen aurka jokatuz. Gizartean nesken diskriminazio egoerak gutxitu direla eta sexuen eskubide eta aukerak berdintzen doazela dioten arren, egundoko ibilbidea geratzen da. Beraz, elkarrizketa batzuen bidez, gaur egun goi mailako kirolarien artean neskek bizitzen dituzten diskriminazio egoerak aztertuko ditugu. Beren kiroleko lehen urteetatik gogoratzen dutena egungoarekin alderatuko da, azkenik diskriminazio egoera ezberdinetatik ateratzeko aukera posibleak identifikatuz. Hurrengo lerroetan zehar sexu eta genero kontzeptuak azalduko dira, estereotipoek sexu diskriminazioan eduki ditzakeen ondorioak aipatuz. Ondoren, neskek hezkuntzan bizi izandako eskubide eta aukera gora-beherak gainetik aipatuko dira, garrantzi handia eduki zuten zenbait lege eta hezkuntza erreforma argituz. Azkenik, neskek kirol munduan edukitako garapenari errepaso labur bat emango zaio. Elkarrizketak eta hauetatik lorturiko emaitzak aztertu ondoren, argi ikus daiteke neska kirolariek, beren egunerokoan, diskriminazio egoera ezberdin ugari bizi dituztela. Hala ere, egoera honen analisi hobe bat egiteko denbora gehiago, elkarrizketatuen kopuru handiagoa eta hauek praktikatzen duten kirol aniztasun zabalagoa beharko genuke

Parametric assessment of a building active façade by means of a combined metallic sandwich panel with an unglazed solar collector

The building sector has a poor performance in terms of energy efficiency and is looking for alternatives to reduce the use of fossil fuels on building use stage. Renewables are unlimited and solar thermal energy is a technology with a demonstrated potential. The façade is a key element able to harness renewable energy coming from the sun becoming in an Active Solar Thermal Façade (ASTF). The main purpose of this study is the development of a parametric study using a numerical model to analyze the behavior of an unglazed solar collector. Thus, evaluating different design and meteorological parameters to show their influence on the heat transfer and the efficiency. The study shows that solar irradiation and mass flow are the most influential on thermal difference. However, for the efficiency ambient temperature and inlet temperature both are the most influencing ones. In brief, a set of parameters have a significant influence on the behavior of the ASTF that are fully governed by environmental conditions. Nevertheless, there are some other parameters that can be controlled during the operation. The challenge is to make a continuous configuration of this adaptable values depending on the external situation to achieve a higher performance for the ASTF

4. Wochenbericht M77/1

Im Pazifischen Ozean erstreckt sich westlich von Peru und Ecuador ein riesiges Gebiet, in dem lebenswichtiger Sauerstoff Mangelware ist. Dieses Gebiet ist Ziel der Expedition „M77“, zu der das deutsche Forschungsschiff METEOR am 22. Oktober 2008 ausläuft. Sie steht unter der Leitung von Kieler Meereswissenschaftlern des Sonderforschungsbereichs (SFB) 754, an dem das Leibniz-Institut für Meereswissenschaften (IFM-GEOMAR) und die Christian-Albrechts-Universität zu Kiel (CAU) beteiligt sind. In einem Weblog berichten die Forscher direkt von Bord der METEOR über ihrer Arbeit. METEOR Cruise 77/1 Talcahuano (Chile) – Callao (Peru) Weekly Report No. 4: 10. - 16. 11. 0

FORMALIZING INFORMALITY: THE PRAEDIAL REGISTRATION SYSTEM IN PERU

The Praedial Property Registration system has been presented as an alternative system to traditional registries for the formalization of immovable property. Much of the earlier design and pilot work for the Praedial Property Registration system was done by the Peruvian private organization, Instituto Libertad y Democracia (ILD). They claim that in Peru they "have formalized over 150,000 properties much more quickly, and at dramatically less costs, than traditional titling and registration programs" in three-and-a-half years during the early 1990s. This property formalization system has been trademarked as PROFORM. It is being offered to other countries as a quick and inexpensive way to convert informal property in the hands of a large proportion of the population into legally recognized private property, and as a source of capital for the grassroots development of these countries. This study assesses the functioning of this system in Peru and its replicability in other countries. There is no easily accessible documentation on how this property formalization program has actually functioned in Peru, and it is therefore difficult for development agencies to determine its applicability elsewhere. This assessment of the Registro Predial in Peru is an attempt to document the functioning of an important component of this formalization program. The study examines different aspects of property formalization and related institutions and processes. The scope of this assessment, therefore, includes not only the Registro Predial registration system, but also the titling process (prior to registration) and the credit worthiness and credit opportunities for titled and registered property in both urban and rural areas in Lima that fall under the jurisdiction of the Registro Predial. The study also examines the concepts and legal framework of titling, registration, ownership rights, and possession rights within the Peruvian context.Land titles--Registration and transfer--Peru, Land tenure--Government policy--Peru, Land administration--Peru, Land Economics/Use,

BIM: a technology acceptance model in Peru

The purpose of this paper is to empirically study factors that facilitate the adoption of building information modelling (BIM) among practitioners using the unified theory of technology acceptance model (TAM). The factors identified in the TAM were examined using a quantitative approach. The empirical investigation has been conducted using a survey questionnaire. The data set has been obtained from 73 architects and engineers in Peru. Results show that Perceived Usefulness (PU) is the most important determinant of Behavioural Intention (BI), while Perceived Ease of Use (PEOU) is found to have no significant effect on BI. The findings provide an excellent backdrop in the development of policy and a roadmap for BIM implementation in Peru. The original contribution and value of the paper is the use of TAM to provide empirical evidence on factors that facilitate BIM adoption in Peru

Morphologische Entwicklung des Ucayali in Peru ohne menschliche Einflüsse

The Ucayali River originates in the high Andean Mountains near the city of Cusco in Peru. After about 1,600 km, it joins with the Marañón River. Both the Ucayali River and the Marañón River are sources of the Amazon. From 2001 to 2005, the Ministry of Transport and Communication of Peru funded a study to determine the navigability of the Ucayali River. In the process, an extensive data set was acquired including hydrological and sedimentological data as well as a comprehensive topographical survey of the riverbed. Since the Ucayali River has experienced no stream channel modification in the past, the available data provide information about the flow pattern for a natural stream and insight into a reference ecosystem. This paper offers the first analysis of the available data and a sediment transport calculation for the Ucayali River.Der Ucayali entspringt in den Anden nahe der Stadt Cusco in Peru. Er fließt über eine Strecke von rd. 1.600 km durch Peru bis zum Zusammenfluss mit dem Marañón. Beide Flüsse bilden die Quellflüsse für den Amazonas. Im Rahmen einer Studie über die Schiffbarkeit des Ucayali wurden vom peruanischen Ministerium für Verkehr und Kommunikation von 2001 bis 2005 umfangreiche Datenerhebungen durchgeführt. Die Datenerhebungen umfassen u. a. hydrologische und sedimentologische Daten sowie umfangreiche Vermessungen des Flusslaufs. Da der Ucayali bislang keinerlei Regulierungs- oder Ausbaumaßnahmen unterlegen ist, geben die Daten einen Einblick in die natürlichen Fließverhältnisse eines großen Flusses und damit einen Einblick in ein Referenz-Ökosystem. Erste Ergebnisse der Datensichtung und Sedimenttransportberechnungen zum Ucayali werden vorgestellt

The discovery of a second locality in Peru for Pleuridum andinum Herz. (Ditrichaceae, Musci)

Pleuridium andinum Herz., a rare moss previously known from only 3 sites in South America, is here reported from a second locality in Peru. The new locality is near Aquas Caliente, Peru, ca. 5720 m a.s.l. This discovery is only one of three collections made since this species was first collected at the “locus classicus” in Bolivia in 1911. The holotype was examined and the original Latin diagnosis is amended in English as a result of examination of both the holotype and the newly discovered specimens. Previously unknown taxonomic features are figured