Two-center interference and ellipticity in high-order harmonic generation from H2+_2^+

We present a theoretical investigation into the two-center interference in aligned H$_2^+$. The influence of the laser field on the recombination step is investigated by comparing laser-induced harmonic generation with harmonic generation from field-free collisions of Gaussian wave packets with the core. We find that for different Gaussian wave packets colliding with the molecule, the interference minimum occurs at the same alignment angle. The same result is obtained for the laser-induced spectrum when only a single electronic trajectory per harmonic contributes. When multiple electronic trajectories contribute, we find an effect on the minimum position because the interference between short and long trajectories is alignment-dependent. The two-center interference and the influence of the Coulombic potential are clearly seen not only in the harmonic intensity and phase but also in the polarization direction and ellipticity. We observe significant ellipticity of the emitted radiation around the two-center interference minimum.Comment: 10 pages, 15 figures; v2: clearer figures and other small changes; v3: small correction

Entrepreneurial exit, ability and engagement across countries in different stages of development

Entrepreneurial ability has been suggested to be an important predictor of entrepreneurial engagement. In this paper we investigate the extent to which different types of recent entrepreneurial exit experiences foster entrepreneurial ability and subsequent entrepreneurial engagement. We discriminate between several exit modes and distinguish the following engagement levels: potential, intentional, nascent, young and established entrepreneurship. We use individual-level data for 67 countries that participated in the Global Entrepreneurship Monitor during 2007, 2008 and 2009. Our findings indeed show that entrepreneurial exit directly fosters entrepreneurial engagement as well as indirectly through enhanced entrepreneurial ability. We also find dat positive as well as negative exit experiences foster subsequent entrepreneurial engagement. In addition, the impacts of exit on ability and exit on engagement increase with the stage of development of a country.

Control of recollision wave packets for molecular orbital tomography using short laser pulses

The tomographic imaging of arbitrary molecular orbitals via high-order harmonic generation requires that electrons recollide from one direction only. Within a semi-classical model, we show that extremely short phase-stabilized laser pulses offer control over the momentum distribution of the returning electrons. By adjusting the carrier-envelope phase, recollisions can be forced to occur from mainly one side, while retaining a broad energy spectrum. The signatures of the semi-classical distributions are observed in harmonic spectra obtained by numerical solution of the time-dependent Schr\"{o}dinger equation.Comment: 8 pages, 4 figures; v2: Added some extra clarifications; v3: minor grammatical change

Modelos de financiarización de las pensiones en cuatro estados de bienestar europeos

This paper explores the financialization of pensions in four European welfare states: the United Kingdom, Germany, the Netherlands and Sweden. In these welfare states, financial markets and financial actors have become increasingly important for pension provisions. Pension financialization is a variegated phenomenon, involving changes in funding mechanism, plan design, financial management and the centrality of funded pension schemes in the political economy. Nationally-specific configurations of these dimensions have created distinct patterns of pension financialization in the four cases. I argue that each pattern is the outcome of specific sticking points for policy reform that have emerged out of the institutional context of the national pension system. Locating these institutional sticking points helps identify common mechanisms of pension financialization across cases that are characterized by empirical variegation.Este artículo analiza la financiarización de las pensiones en cuatro estados de bienestar europeos: el Reino Unido, Alemania, los Países Bajos y Suecia. En estos estados de bienestar, los mercados y actores financieros se han vuelto cada vez más importantes en la provisión de las pensiones. La financiarización de las pensiones es un fenómeno varia-do, que implica cambios en el mecanismo de financiación, el diseño del plan, la gestión financiera y la centralidad de las pensiones de capitalización en la economía política. Las configuraciones nacionales específicas de estas dimensio-nes han creado patrones distintos de financiarización en los cuatro casos. Sostengo que cada patrón es el resultado de puntos de conflicto específicos para la reforma de dichas políticas, que han surgido del contexto institucional del sis-tema nacional de pensiones. La localización de estos ele-mentos de referencia institucionales ayuda a identificar me-canismos comunes de financiarización en todos los casos, que se caracterizan por una variedad empírica

Job’s Problematic Body for Both Protagonist and Recipient

For as long as Job remains an invisible voice without an exterior body, understanding his inner experiences will remain mostly elusive as well. The body of Job is “heard” in the emotional descriptions that Job gives of his pain as he experiences it kinaesthetically. When speech and sound are, however, seen as the “shadow” of the body, and in this way echoing it in its absence, the silences, like the unconscious, are the base of this body in these descriptions. In the meantime, Job’s body remains problematic as it is, firstly, not recognised by his interlocutors for lack of empathy, secondly, not by the recipient(s) for whom it is nothing but two-dimensional words, which are often almost incomprehensible due to cultural and temporal distance, and, thirdly, not even by Job himself who struggles to see in it the reality which God eventually points out to him. Yet a bridge can be built thanks to a “universal” body shared by all parties

The digital age project: strategies that enable older social housing residents to use the internet

Provides insights into the factors affecting technology adoption for older and disadvantaged people, and provides training and interface guidelines and a potential model for other public housing communities to become more digitally aware. Research Aims The experience of social housing communities in countries like the United Kingdom suggests that while access to digital infrastructure and equipment is important, access alone does not equate to digital inclusion. The aim of this research was two-fold, namely to: Understand the impact of access to and use of the internet, within a community of potentially vulnerable consumers; and, Determine the strategies that may assist people living in public housing communities to become more digitally aware and enable them to take advantage of online services such as health, government, news, shopping and methods of online communication. The research also sought to determine what benefits may flow from information technology skills to perceptions of social connectedness, self-efficacy, resilience, health and well-being. Given that people with low levels of computer literacy typically face greater risk of cognitive overload in attempting to learn new technologies, the principles and guidelines from Cognitive Load Theory were applied to training materials and activities to minimise cognitive load and thereby facilitate learning. The research was designed with a view to providing important insights into the factors affecting technology adoption for older and disadvantaged people, as well as providing training and interface guidelines and a potential model for other public housing communities to become more digitally aware

Entrepreneurial exit in real and imagined markets

Entrepreneurs exit their business due to selection pressures experienced in the market place, i.e. business failure. Next to this well known ex-post decision to exit, entrepreneurs select exantewhether they are willing to pursue an entrepreneurial career at all, or to give up theseentrepreneurial intentions. Hardly anything is known about the latter selection process in imagined markets that precedes the variety creation and selection process in real markets. This paper explores and explains the prevalence of these two selection processes using survey data on 20,000 individuals in 27 European countries and the US in 2007. We distinguish business failures from exit by sell-off. Results indicate that individuals in the US are less likely to exit imagined markets, and are more likely to have exited the real market (especially by selling their business) than Europeans. Individuals in a Corporatist welfare state regime have relatively high chances to exit imagined markets. Business owners in urban environments are more likely to fail, while individuals with a high risk tolerance, a high education and self-employed parents are less likely to exit in imagined as well as in real markets (via business failure). This study shows that exit in real and in imagined markets is differently affected by competition and institutions. These selection environments have differential effects on entrepreneurial aspirations and actions of individuals, and provide evidence for the dissimilar nature of exit in real and exit in imagined markets.

The Message Conveyed By IFRS-Compliant Information: A South African Perspective

South African companies must prepare financial statements in accordance with International Financial Reporting Standards (IFRS) or other reporting standards modelled on IFRS. Literature suggests that the complexity of IFRS, which stems from detailed rules-based principles in these standards, may harm the ability of users of financial statements to understand financial information in a meaningful way. The primary objective of this study was to evaluate whether selected users and preparers of financial statements in South Africa interpret selected IFRS-compliant information prepared in accordance with rules-based principles in the manner intended by the standard-setters. The results of the study, which are based on data gathered by administering a questionnaire that contained selected IFRS-compliant note disclosures to accounting practitioners, accountancy students, and non-accountants in business, suggest that the participants of the study did not understand such IFRS-compliant information as intended by the standard-setters. Additional disclosure, the adoption of a simplified accounting framework for Small and Medium-sized Entities (SMEs) and the use of an output-based continuing professional education (CPE) system are identified as areas that warrant further research to overcome the threats posed by rules-based principles in IFRS.

1. Wochenbericht Maria S. Merian Expedition MSM70: BATHYCHEM - Bathymetrist Seamounts

Atlantik 9°10 N/ 21°16 W, 31. Dezember 201