Hall effect between parallel quantum wires

We study theoretically the parallel quantum wires of the experiment by Auslaender et al. [Science 308, 88 (2005)] at low electron density. It is shown that a Hall effect as observed in two- or three-dimensional electron systems develops as one of the two wires enters the spin-incoherent regime of small spin bandwidth. This together with magnetic field dependent tunneling exponents clearly identifies spin-incoherence in such experiments and it serves to distinguish it from disorder effects.Comment: 5 pages, 2 figures, missing summation added to Eq. (6), more thorough discussion of the experimental signature

Pseudospin entanglement and Bell test in graphene

We propose a way of producing and detecting pseudospin entanglement between electrons and holes in graphene. Electron-hole pairs are produced by a fluctuating potential and their entanglement is demonstrated by a current correlation measurement. The chirality of electrons in graphene facilitates a well-controlled Bell test with (pseudo-)spin projection angles defined in real space.Comment: 9 pages, 2 figures; v2 with slightly modified abstract and introductio

Knowledge embedded

How should we account for the contextual variability of knowledge claims? Many philosophers favour an invariantist account on which such contextual variability is due entirely to pragmatic factors, leaving no interesting context-sensitivity in the semantic meaning of ‘know that.’ I reject this invariantist division of labor by arguing that pragmatic invariantists have no principled account of embedded occurrences of ‘S knows/doesn’t know that p’: Occurrences embedded within larger linguistic constructions such as conditional sentences, attitude verbs, expressions of probability, comparatives, and many others, I argue, give rise to a threefold problem of embedded implicatures

The development of a simple basal area increment model

In most cases forest practice in Austria use yield tables to predict the growth of their forests. Common yield tables show the increment of pure even-aged stands which are treated in a way the table developer recommends. The usage of these tables in stands which are either uneven-aged, mixed or treated in another way, may lead to inaccurate predictions. To avoid these problems, forest growth models have been developed. Until now they are not widely used in Austria. One reason may be, that most of the models need some input parameters which are usually not gathered by companies. In this work a basal area increment per hectare model has been developed which is based on the input parameters: diameter at breast height, height to diameter ratio, top height at age 100 years and a selection out of several simple competition indices (growing space, basal area of larger trees, competing basal area, crown cross sectional area, crown competition factor, d/dg, d-dg, basal area and stand density index) which are distance independent. The model parametrization was done with seven different statistical methods (linear regression, linear mixed effect model, resistant linear regression, local polynomial regression, lazy learning model, random forest model and neural network model). By using only few input-parameters it should be possible to parametrize this model for many local areas by using inventory data sets of the specific region. The model works in pure and mixed stands of spruce and beech at the Rosaliengebirge. The observed average diameter increment per 5 years is 18.1 mm for spruce and 21.1 mm for beech. The average difference of the predicted and observed diameter-increment on a validation data-set is 0.3 mm for spruce and -0.3 mm for beech within 5 years and the estimated additional spread caused by the model is +-4.5 mm/5 years for spruce and +-4.0 mm/5 years for beech

Public versus Private Education with Risky Human Capital

This paper studies the long-run macroeconomic, distributional and welfare effects of tuition policy and student loans. We therefore form a rich model of risky human capital investment based on the seminal work of Heckman, Lochner and Taber (1998). We extend their original model by variable labor supply, borrowing constraints, idiosyncratic wage risk, uncertain life-span, and multiple schooling decisions. This allows us to build a direct link between students and their parents and make the initial distribution of people over different socio-economic backgrounds endogenous. Our simulation indicate that privatization of tertiary education comes with a vast reduction in the number of students, an increase in the college wage premium and longrun welfare losses of around 5 percent. Surprisingly, we find that from privatization of tertiary education, students are better off compared to workers from other educational classes, since the college wage premium nearly doubles. In addition, our model predicts that income contingent loans on which students don't have to pay interest, improve the college enrolment situation for agents from all kinds of backgrounds.public vs. private education, schooling choice, human capital investment, idiosyncratic uncertainty

Why do some countries get CSR sooner, and in greater quantity, than others? The political economy of corporate responsibility and the rise of market liberalism across the OECD: 1977-2007

How can we explain the historical and trans-national variation of Corporate Responsibility – business’s voluntary engagement for social and environmental ends above legally mandated minimum standards – and how are we to understand this amorphous and essentially contested phenomenon? In this paper, I propose a political-economic explanation for the variation of Corporate Responsibility [Corporate Social Responsibility (CSR) and Corporate Citizenship]. I posit that Corporate Responsibility’s temporal and cross-national variation is linked to its function of legitimating economic liberalization and market liberalism. Both employers and state officials have an interest in compensating for the hardships of liberalization and the weakening of institutionalized social solidarity. One way in which they seek to legitimate the market vis-à-vis their ‘stakeholders’ and the electorate, and justify themselves vis-à-vis their own conscience, is through Corporate Responsibility. CR inoculates firms against burdensome regulation and justifies a light regulatory touch; it facilitates business-friendly institutional reforms; it helps to satisfy employers’ needs and compensate for market failures and deficiencies in public provision. But CR cannot be understood in purely rational-instrumental let alone cynical terms. One of its most essential functions is to constitute businesspeople as responsible moral agents. Those in the engine rooms of contemporary capitalism – whether owners, managers, or employees – want to perceive themselves as serving the common good. This is true irrespective of capitalist ‘varieties.’ In the place of Milton Friedman’s assertion that the business of business is business, employers chant: ‘Free us up so we can do some Corporate Responsibility!’ Using national Corporate Responsibility associations and their membership levels as a proxy for the institutionalization of CR, this paper develops and tests a political-economic explanation for the temporal and trans-national variation of CR. Using Corporate Responsibility associations, a novel proxy for the state of CR in a given country at a given time, I hypothesize that Liberal Market Economies tend to ‘get’ CR earlier, and get more of it, than Social / Coordinated Market economies. Furthermore, Corporate Responsibility co-evolves with the decline of institutionalized social solidarity, ‘embedded liberalism’ and ‘organized capitalism.’ Empirical evidence from more than twenty OECD countries and from the CR ‘leader’ United Kingdom and ‘laggard’ Germany support these hypotheses and illustrate the co-evolution of CR and market liberalism during the past thirty years. In sum, this paper suggests that CR functions as a material and symbolic substitute for institutionalized forms of social solidarity. -- Wie können wir die transnationale Varianz von Corporate Responsibility – des freiwilligen Engagements von Unternehmen für soziale und ökologische Belange über gesetzlich vorgeschriebene Mindeststandards hinaus – erklären? Verbreitete sozialwissenschaftliche Erklärungen von Corporate Social Responsibility (CSR) und Corporate Citizenship stellen soziale Bewegungen und die Diffusion von sozialen Normen in den Vordergrund. Ich entwickele einen alternativen, polit-ökonomischen Ansatz: Corporate Responsibility trägt dazu bei, wirtschaftliche Liberalisierung und Marktliberalismus zu legitimieren. Sowohl Arbeitgeber als auch Politiker sind daran interessiert, die Härten der Liberalisierung und die Schwächung des institutionalisierten sozialen Zusammenhalts zu kompensieren. Corporate Responsibility ist ein Weg, das Vertrauen von Interessenvertretern und Wählern in den Markt zu stärken und gleichzeitig das eigene Gewissen zu entlasten; CR impft Unternehmen gegen zu starke Regulierung und ermöglicht doch einen zurückhaltenden Eingriff; es erleichtert unternehmensfreundliche institutionelle Reformen und es kann helfen, Marktversagen und Mängel in der Bereitstellung von öffentlichen Gütern zu kompensieren. CR darf jedoch nicht rein zweckrational, strategisch oder gar zynisch verstanden werden. Eines seiner wichtigsten Funktionen besteht darin, Geschäftsleuten ein Selbstverständnis als verantwortungsbewusste moralische Akteure zu ermöglichen. Alle Beteiligten im Räderwerk des zeitgenössischen Kapitalismus – ob Eigentümer, Führungskräfte oder Mitarbeiter – wollen sich als dem Gemeinwohl dienend verstehen, unabhängig von unterschiedlichen Spielarten des Kapitalismus. An Stelle von Milton Friedmans Behauptung ‚the business of business is business’ rufen Unternehmer, Wirtschafts-und Arbeitgeberverbände im Chor: ‚Befreit uns von unseren Beschränkungen, damit wir uns in CR engagieren können! Mit der Hilfe eines neuen Indikators wird eine politisch-ökonomische Erklärung für die zeitliche und transnationale Varianz von CR entwickelt. Meine Hypothese ist, dass liberale Marktwirtschaften CR früher und in größeren Mengen ‚bekommen’ als soziale Marktwirtschaften. Darüber hinaus behaupte ich, dass der Anstieg von Corporate Responsibility einher geht mit dem Niedergang des institutionalisierten sozialen Zusammenhalts und des „organisierten Kapitalismus.“ Empirische Daten aus mehr als zwanzig OECD-Ländern und aus dem CRVorreiter England und dem „Nachzügler“ Deutschland unterstützen diese Thesen und veranschaulichen die Ko-Evolution des Aufstiegs von CR und der Liberalisierung der Wirtschaft in den letzten dreißig Jahren. Zusammengefasst, wird in diesem Papier vorgeschlagen, CR als materiellen und symbolischen Ersatz für institutionalisierte Formen des sozialen Zusammenhalts zu verstehen. Für Theorie und Forschungspraxis legen diese Ergebnisse nahe, politisch- ökonomische Institutionen und die Spielarten des Kapitalismus bei der Untersuchung von Corporate Social Responsibility (CSR) und Corporate Citizenship stärker in den Vordergrund zu rücken.Corporate Social Responsibility,liberalization,market liberalism,quantity of CSR,timing of CSR,Varieties of Capitalism