Neel order, quantum spin liquids, and quantum criticality in two dimensions

This paper is concerned with the possibility of a direct second-order transition out of a collinear Neel phase to a paramagnetic spin liquid in two-dimensional quantum antiferromagnets. Contrary to conventional wisdom, we show that such second-order quantum transitions can potentially occur to certain spin liquid states popular in theories of the cuprates. We provide a theory of this transition and study its universal properties in an epsilon expansion. The existence of such a transition has a number of interesting implications for spin-liquid-based approaches to the underdoped cuprates. In particular it considerably clarifies existing ideas for incorporating antiferromagnetic long range order into such a spin-liquid-based approach.

Rätt som argument : Leo Mechelin och finska frågan 1886-1912

Right as an Argument. Leo Mechelin and the Finnish Question 1886-1912 At the turn of the 20th century the Finnish Question rose up as a political and juridical issue at the international arena. The vaguely précised position of Finland in the Russian empire led to diverse conclusions concerning the correctness of the February manifesto of 1899. It was predominantly among a European elite of politicians, cultural workers and academics the issue rose some interest. Finns were active making propaganda for their cause, and they put an emphasis on the claim that the right was on the Finnish side. In the study Elisabeth Stubb compare the Finnish, Russian and European statements about the Finnish Question and analyse their use of right as an argument. The Finnish Question offers at the same time a case study of a national entity which possesses a political sphere of life but is not fully independent, and its possibilities to drive its interests in an international context. Leo Mechelin (1839-1914), the leader of the Finnish propaganda organization abroad, is used as a point of departure. The biographical stance is formed into a triangle, where Leo Mechelin, the idea of right and the Finnish Question abroad are the three cornerstones. The treatment of one cornerstone sheds a ligth on the two others. The metaphor of triangulation also worked as a method to reach "a third stance" in a scinetific and political issue that usually is polarised into two opposite alternatives. An adherence to a strict legal right could not in the end offer a complete, unquestionable and satisfactory solution to the Finnsih Question, it was dependent on "the right of state wisdom and sound insight". The Finnish propaganda abroad used almost completely alternative ways of making politics. The propaganda did not have a decisive effect on countries' official politics, but gained unofficial support, especially in the public opinion and in academic statements. Mechelin claimed that the political field was dependent on public opinion and scientific research. Together with the official politics these two fields formed a triangle that shared the task of balancing the political arena and preventing it from making unwise decisions of taking an unjust turn. The international sphere worked as a balancing part in the Finnish Question. Mechelin tried by claiming the status of state for Finland's part to secure the country a place at the official international arena. At the same time, and especially when the claim was not fully adopted, he emphasised, and in a European context worked for, that right would become the guiding light not only for international relations, but also for the policy making in the inner life of the state.

Structured Learning for Non-Smooth Ranking losses

Learning to rank from relevance judgment is an active research area. Itemwise score regression, pairwise preference satisfaction, and listwise structured learning are the major techniques in use. Listwise structured learning has been applied recently to optimize important non-decomposable ranking criteria like AUC (area under ROC curve) and MAP(mean average precision). We propose new, almost-lineartime algorithms to optimize for two other criteria widely used to evaluate search systems: MRR (mean reciprocal rank) and NDCG (normalized discounted cumulative gain)in the max-margin structured learning framework. We also demonstrate that, for different ranking criteria, one may need to use different feature maps. Search applications should not be optimized in favor of a single criterion, because they need to cater to a variety of queries. E.g., MRR is best for navigational queries, while NDCG is best for informational queries. A key contribution of this paper is to fold multiple ranking loss functions into a multi-criteria max-margin optimization.The result is a single, robust ranking model that is close to the best accuracy of learners trained on individual criteria. In fact, experiments over the popular LETOR and TREC data sets show that, contrary to conventional wisdom, a test criterion is often not best served by training with the same individual criterion.

Urban Sprawl Pattern Analysis Using GIS

Urbanisation has evinced interest from a wide section of the society including experts, amateurs, and novices. The multidisciplinary scope of the subject invokes the interest from ecologists, to urban planners and civil engineers, to sociologists, to administrators and policy makers, students and finally the common man. With the development and infrastructure initiatives mostly around the urban centres, the impacts of urbanisation and sprawl would be on the environment and the natural resources. The wisdom lies in how effectively we plan the urban growth without - hampering the environment, excessively harnessing the natural resources and eventually disturbing the natural set-up. The research on these help urban residents and policymakers make informed decisions and take action to restore these resources before they are lost. Ultimately the power to balance the urban ecosystems rests with regional awareness, policies, administration practices, management issues and operational problems. This publication on urban systems is aimed at helping scientists, policy makers, engineers, urban planners and ultimately the common man to visualise how towns and cities grow over a period of time based on investigations in the regions around the highway and cities. Two important highways in Karnataka, South India, viz., Bangalore - Mysore highway and the Mangalore - Udupi highway, in Karnataka and the Tiruchirapalli - Tanjavore - Kumbakonam triangular road network in Tamil Nadu, South India, were considered in this investigation. Geographic Information System and Remote Sensing data were used to analyse the pattern of urbanisation. This was coupled with the spatial and temporal data from the Survey of India toposheets (for 1972), satellite imageries procured from National Remote Sensing Agency (NRSA) (LANDSAT TM for 1987 and IRS LISS III for 1999), demographic details from the Census of India (1971, 1981, 1991 and 2001) and the village maps from the Directorate of Survey Settlements and Land Records, Government of Karnataka. All this enabled in quantifying the increase in the built-up area for nearly three decades. With intent of identifying the potential sprawl zones, this could be modelled and projected for the future decades. Apart from these the study could quantify some of the metrics that could be used in the study of urban sprawl.

Towards a broadband chirped pulse Fourier transform microwave spectrometer

This article gives a brief review of microwave spectroscopy and the experimental techniques used for obtaining microwave spectrum of molecules and complexes since 1950s. It presents a brief summary of the pulsed nozzle Fourier transform microwave (PNFTMW) spectrometer, fabricated in our laboratory, and discusses some of the important results obtained using the spectrometer. The most significant among the results from this spectrometer is the direct structural determination of weakly bound complexes involving H2O/H2S. These have challenged the conventional wisdom on hydrogen bonding leading us to propose a modern definition for the same through IUPAC. The limitations of the PNFTMW spectrometer and the need for the new chirped pulse Fourier transform microwave spectrometer are discussed as well. Moreover, preliminary results from our laboratory on generating a 1 A mu s chirped pulse of 1 GHz bandwidth are given.

Impossibilità di pensare Dio non esistente : il Proslogion di Anselmo d'Aosta come applicazione implicita dei moderni procedimenti di logica aletica

Resumen: La vera intenzione teologica di Anselmo d’Aosta nello scrivere il Proslogion e il vero significato del suo celebre unum argumentum vanno visti nella funzione che la ragione svolge necessariamente all’interno della vita di fede del cristiano. Anselmo, come Tommaso d’Aquino, non sostiene che l’esistenza di Dio sia un “articulus fidei” ma piuttosto uno dei “praeambula fidei”. La ragione naturale ha la certezza che Dio esiste, ancora prima della dimostrazione metafisica, e questo non fa che confermare l’assurdità di pensare che non esista il fondamento reale di tutte le cose esistenti.

La aventura del barco encantado y nuevas notas sobre las escrituras del viaje en el Quijote

Integran este número de la revista ponencias presentadas en Studia Hispanica Medievalia VIII: Actas de las IX Jornadas Internacionales de Literatura Española Medieval, 2008, y de Homenaje al Quinto Centenario de Amadis de Gaula.

La ley nueva y la nueva evangelización : la tradición tomista y la perspectiva moral de Evangelii gaudium

Resumen: Las indicaciones pastorales del Papa Francisco en Evangelii gaudium ofrecen la oportunidad para redescubrir el valor de la categoría ley bajo la guía de la tradición tomista recogida en el documento pontificio. La propuesta moral del Evangelio o ley nueva, siguiendo la sinonimia utilizada por santo Tomás de Aquino, no puede ser reducida a un precepto o una serie de normas; muy por el contrario, revisitando la doctrina del Doctor Común podemos descubrir la necesidad de una hermenéutica sapiencial y profundamente bíblica de uno de los pilares de la moral cristiana. En el camino de la conversión pastoral, el retorno a las fuentes tomistas vuelve a iluminar la reflexión teológica con fecundidad renovada.

Una mirada a Egipto desde la Biblia Hebraica

Resumen: ¿Qué imágenes de Egipto encontramos en la Biblia Hebrea, además del éxodo? Los textos bíblicos miran a su vecina Egipto como país de refugio (del hambre o la persecución). Pero por ser grande y fuerte, Egipto es también proveedor de armamento militar. Puede tornarse una falsa seguridad para un pueblo que debe confiar solo en Yavé. La literatura sapiencial es más benévola. En la descripción de la cama lujosa a la que una mujer descarada atrae a su amante, Proverbios 7 ofrece un homenaje indirecto a la riqueza egipcia.

Alfonso X : un modelo de rey letrado

Integran este número de la revista ponencias presentadas en Studia Hispanica Medievalia VIII: Actas de las IX Jornadas Internacionales de Literatura Española Medieval, 2008, y de Homenaje al Quinto Centenario de Amadis de Gaula.

Cien años de la Facultad de Teología : la progresiva maduración de un estilo

Resumen: En su lectio inauguralis del año académico de la Facultad de Teología de la Universidad Católica Argentina, el autor toma la oportunidad de la celebración del Centenario de dicha Facultad y los cincuenta años de la clausura del Concilio Vaticano II, para reflexionar sobre la influencia de este último en el “estilo” de aquélla. Este estilo es, en efecto, fruto de la recepción del Concilio, que ha hecho prevalecer el tema del amor en el pensamiento y la vida cristiana, junto con una visión de la revelación como comunicación de Dios a los hombres en la historia, y una nueva atención a los “signos de los tiempos”, generando así una nueva actitud caracterizada por la apertura y el diálogo. El “estilo integrador” de nuestra Facultad, inspirado en el Concilio y en la figura de Pablo VI, encuentra un renovado impulso en el Papa Francisco, para quien la “auténtica” teología debe ser hecha “de rodillas” y desde el “corazón”, siendo a la vez saber humilde y amor comprometido

Le relativisme idéologique

Abstract: From a general standpoint, current thought is dominated by an ideological relativism which considers that truth depends on whom asserts a certain statement. This stance, related to Protagoras’ perspective, rejects the Enlightenment’s view, especially Kant’s way of thinking, viz. It rejects of all forms of authority, transcendent authority in particular. It also favors the conception of the subject developed by Sartre’s existentialism. However, relativism is the ultimate expression of skepticism which always reflects a painful rational relinquishment of the natural desire for truth. Relativism weakens reason and makes the arrival of ideological and political totalitarianism possible, which the 20th century suffered in its most tragic versions. In order to prevent its consequences and to restore reason’s legitimate confidence in wisdom, modern man ought to find the universal within him and his natural thirst for truth, and his transcendent origin. This demands recognizing and accepting humbly man’s condition as a creature, and his dependence on the Verb, who is Truth and Life.

Sobre ciencia práctica y prudentia : aproximaciones desde las ideas de John Finnis

Resumen: En el presente trabajo, el autor ensaya una presentación de las contribuciones de John Finnis a los temas de la ciencia práctica y la prudentia. Respecto del primero, destaca el carácter analógico del concepto de ciencia y las particularidades de su aplicación al campo del saber práctico. Con referencia a la segunda, apunta su relevancia en el esquema clásico del pensamiento práctico, en especial en referencia a la determinación de los objetos de las virtudes y al papel de los absolutos morales en el razonamiento práctico-moral.

La integración del saber en la obra de Jacques Maritain

Resumen: La cuestión sobre la integración del saber es un tema particularmente relevante en el panorama de la epistemología actual. Nuestra época promueve un clima favorable al diálogo, pero con resultados de valor desparejo. Uno de los grandes intelectuales cristianos del siglo XX, Jacques Maritain, dedicó una parte importante de su obra a reflexionar sobre estas cuestiones. Siguiendo su lema distinguir para unir este trabajo se despliega en dos partes: la primera referida al momento de distinción entre las disciplinas, y la segunda al momento de su (relativa) unificación. En esta entrega se avanza a partir de las intuiciones primordiales de la sabiduría metafísica y las grandes categorías del conocimiento: el saber en sentido analógico, la filosofía, la ciencia y la teología. Maritain introduce el criterio de división a partir de lo especulativo y lo práctico. Luego, en el orden especulativo, recurre a la doctrina tradicional sobre la abstracción y sus formas, esforzándose por adaptar los principios que la inspiran a la compleja temática de la ciencia actual. Se cierra con una consideración acerca de las modalidades del saber práctico. Este movimiento de distinción será completado en la segunda parte del trabajo a partir de las exigencias de complementación de las disciplinas involucradas.

Antonio Machado y Lev Vigotski. Ironía o crítica como instancias modernizadoras

499 p. (Bibliogr. 443-474)