ID slicing and the automated factory

The automation of the slicing system utilizing internal-diameter saws for the production of the silicon wafers used in solar arrays is discussed. It is argued that saw productivity can be increased by reducing silicon waste, decreasing usage of consumables, keeping the saw slicing, and increasing the cutting speed. Several machine enhancements utilizing automatic control are discussed. The need for record keeping to anticipate maintenance operations is noted, and a digital serial communication interface with the microprocessor-based saws is recommended. Distributed control of the manufacturing process is discussed in detail, and is recommended as a method for increasing productivity

Search engine user behaviour: How can users be guided to quality content?

The typical behaviour of the Web search engine user is widely known: a user only types in one or a few keywords and expects the search engine to produce relevant results in an instant. Search engines not only adapt to this behaviour. On the contrary, they are often faced with criticism that they themselves created this kind of behaviour. As search engines are trendsetters for the whole information world, it is important to know how they cope with their users’ behaviour. Recent developments show that search engines try to integrate results from different collections into their results lists and to guide their users to the right results. These results should not only be relevant in general, but also be pertinent in the sense of being relevant to the user in his current situation and in accordance to his background. The article focuses on the problems of guiding the user from his initial query to these results. It shows how the general users are searching and how the intents behind their queries can be used to deliver the right results. It will be shown that search engines try to give some good results for everyone instead of focusing on complete result sets for a specific user type. If the user wishes, he can follow the paths laid out by the engines to narrow the results to a result set suitable to him

Geometry of Non-expanding Horizons and Their Neighborhoods

This is a contribution to MG9 session BHT4. Certain geometrically distinguished frame on a non-expanding horizon and in its space-time neighborhood, as well as the Bondi-like coordinates are constructed. The construction provides free degrees of freedom, invariants, and the existence conditions for a Killing vector field. The reported results come from the joint works with Ashtekar and Beetle.Comment: BHT4 session of MG

A three-year study on the freshness of Web search engine databases

This paper deals with one aspect of the index quality of search engines: index freshness. The purpose is to analyse the update strategies of the major Web search engines Google, Yahoo, and MSN/Live.com. We conducted a test of the updates of 40 daily updated pages and 30 irregularly updated pages, respectively. We used data from a time span of six weeks in the years 2005, 2006, and 2007. We found that the best search engine in terms of up-to-dateness changes over the years and that none of the engines has an ideal solution for index freshness. Frequency distributions for the pages’ ages are skewed, which means that search engines do differentiate between often- and seldom-updated pages. This is confirmed by the difference between the average ages of daily updated pages and our control group of pages. Indexing patterns are often irregular, and there seems to be no clear policy regarding when to revisit Web pages. A major problem identified in our research is the delay in making crawled pages available for searching, which differs from one engine to another

Implementation of community cohesion policy in Italy and its role in elimination of regional disparities

The objective of this paper is to present the contribution of Community regional policy funds to achieving socio-economic cohesion of Italian regions eligible under Objective 1, as well as to discuss future development barriers and opportunities of these regions. The paper also provides a description of Italy's adjustment to the Community policy, the funds exploited by cohesive regions during the 2000-2006 programming period and their efficiency in the elimination of regional disparities.Celem artykułu jest przedstawienie znaczenia, jakie środki wspólnotowej polityki regionalnej odegrały w osiąganiu spójności społeczno - gospodarczej przez włoskie regiony Celu 1 oraz pokazanie barier i szans rozwojowych dla tych terytoriów w przyszłości. W części pierwszej przedstawiony został proces dostosowawczy Włoch do polityki wspólnotowej, głównie pod względem zgodności prowadzonej polityki z zasadami polityki regionalnej oraz dostosowań instytucjonalnych. W części drugiej przedstawiona została analiza porównawcza wielkości funduszy wykorzystanych przez regiony kohezyjne w okresie programowania 2000 - 2006 z założonymi wielkościami, a także próba odpowiedzi na pytanie, czy środki te w istotnej mierze wpłynęły na zmniejszenie się różnic miedzy biedniejszymi regionami Południa a bogatszymi Północy - Centrum. W ostatniej części pokazano możliwości i bariery rozwojowe, przed którymi stoją włoskie regiony kohezyjne

Vector-scalar mixing to all orders, for an arbitrary gauge model in the generic linear gauge

I give explicit fromulae for full propagators of vector and scalar fields in a generic spin-1 gauge model quantized in an arbitrary linear covariant gauge. The propagators, expressed in terms of all-order one-particle-irreducible correlation functions, have a remarkably simple form because of constraints originating from Slavnov-Taylor identities of Becchi-Rouet-Stora symmetry. I also determine the behavior of the propagators in the neighborhood of the poles, and give a simple prescription for the coefficients that generalize (to the case with an arbitrary vector-scalar mixing) the standard $\sqrt{\mathcal{Z}}$ factors of Lehmann, Symanzik and Zimmermann. So obtained generalized $\sqrt{\mathcal{Z}}$ factors, are indispensable to the correct extraction of physical amplitudes from the amputated correlation functions in the presence of mixing. The standard $R_\xi$ guauges form a particularly important subclass of gauges considered in this paper. While the tree-level vector-scalar mixing is, by construction, absent in $R_\xi$ gauges, it unavoidably reappears at higher orders. Therefore the prescription for the generalized $\sqrt{\mathcal{Z}}$ factors given in this paper is directly relevant for the extraction of amplitudes in $R_\xi$ gauges.Comment: 17 pages, 0 figures [v2: misprint in Eq.35 corrected

The Kolmogorov Law of turbulence: what can rigorously be proved?

Conferencia plenaria por invitaciónWe define a mathematical framework in which we can specify the Reynolds decomposition and the correlation tensors of an incompressible locally homogeneous and isotropic turbulent flow. After having fixed the technical background and some probabilistic tools, we focus on the 2-order correlation tensor, which is the covariance matrix of the velocity vectors at two different points of the flow. We perform a Taylor expansion of this matrix when the two points are close to one another. We characterize the principal part of this expansion, for which we prove the law of the 2/3 by a mathematical similarity principle.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. Conferencias plan propio de investigación de la UM

Parametrix for the localization of the Bergman metric on strictly pseudoconvex domains

We give the parameter version of localization theorem for Bergman metric near the boundary points of strictly pseudoconvex domains. The approximation theorem for square integrable holomorphic functions on such domains in the spirit of Graham-Kerzman is proved in the hereby paper, as well