Jet Production in proton-proton collisions at sqrt(s) =7 TeV with the ATLAS experiment

We report on the first measurements done with the ATLAS experiment of the characteristics of energetic jets produced in proton-proton collisions at the center of mass energy of 7 TeV. Jets are reconstructed using the anti-kt clustering algorithm with distance parameter R=0.6. The kinematic region investigated in this paper corresponds to jets with transverse momentum p_T>30$GeV and rapidity |y_jet |<2.8. A critical understanding of the jet production is obtained by comparing the data to predictions based on leading-order QCD matrix elements plus parton shower Monte Carlo simulated events. The results shown are obtained on a data sample corresponding to about 1 nb**-1 of integrated luminosity delivered by the Large Hadron Collider.Comment: 4 pages, Presented at QCD10 - 15th International QCD Conference, Montpellier (France), 28th June-3rd Jul

Recommender Systems by means of Information Retrieval

In this paper we present a method for reformulating the Recommender Systems problem in an Information Retrieval one. In our tests we have a dataset of users who give ratings for some movies; we hide some values from the dataset, and we try to predict them again using its remaining portion (the so-called "leave-n-out approach"). In order to use an Information Retrieval algorithm, we reformulate this Recommender Systems problem in this way: a user corresponds to a document, a movie corresponds to a term, the active user (whose rating we want to predict) plays the role of the query, and the ratings are used as weigths, in place of the weighting schema of the original IR algorithm. The output is the ranking list of the documents ("users") relevant for the query ("active user"). We use the ratings of these users, weighted according to the rank, to predict the rating of the active user. We carry out the comparison by means of a typical metric, namely the accuracy of the predictions returned by the algorithm, and we compare this to the real ratings from users. In our first tests, we use two different Information Retrieval algorithms: LSPR, a recently proposed model based on Discrete Fourier Transform, and a simple vector space model

Market analysis for Acrean timbers

In the state of Acre (Brazil), keys of development are the valorization of natural resources, which include non-ligneous and timber products. The need to develop a sustainable wood industry lead to assess markets that can be targeted from Acre in an sustainable and economic way. The objective of this analysis is so to highlight the opportunities and the marketing strategies that are the most suitable from a timber business point of view, in the specific context of Acre. Care should be taken that all the conclusions that can be interpreted from this work are valid from a timber business point of view, but these market considerations don’t necessarily prevail on other considerations, such as social or political ones. From a general point of view, Acre State, despite its remote location, is not independent of the globalization process. This means that the market analysis is required to start from the world level markets, and has to deepen progressively down to national, regional and local levels, in order to correctly isolate which are the competitive advantages and disadvantages of the specific Acrean context.

State of the art of metalclad airships

Metalclad airship development of the past history are considered along with the immediate prospects for continuation of the development of these airships. The metalclad airships promise high safety even in highly inclement weather, are capable of high speeds, while lifting high useful loads. Metalclad airships which in first cost would compare favorably with the costs of sea-going ships and in operating costs promise to be lower than airplanes

Remedying School Segregation: How New Jersey's Morris School District Chose to Make Diversity Work

Beyond the districtwide numbers, the Morris district has achieved remarkable diversity at the school building level. Since the district has only one middle school and one high school, these are not where the diversity rubber meets the road. Rather, the test is the elementary school populations. There, the Morris district shines. Despite the fact that students live in relatively homogeneous, segregated neighborhoods, the elementary schools they attend defy that pattern. For example, to achieve perfect racial balance between black and white students at the elementary school level, only about 2.6 percent would have to change their school assignments.The Morris district still struggles with two aspects of diversity, however. First,—in common with virtually every diverse school district in the country—it is still attempting to bring meaningful diversity to every program and course within its school buildings, from higher-level Honors and Advanced Placement courses to special education classifications and rosters of disciplinary actions. Second, in common with some but hardly all diverse districts across the country, the Morris district is trying to cope with the explosive growth of Hispanic students, many of them in recent years economically disadvantaged students from Central American countries where they often failed to receive a solid educational foundation in their own language and culture. Understandably, these students tend not to score well on standardized tests, especially in their early years in MSD. This contributes substantially to the Morris district's record of relatively poor achievement levels in three substantially overlapping student categories—Hispanic, English Language Learners (ELL), and economically disadvantaged students—as compared to its relatively strong achievement levels for white and black students.As to both challenges, the Morris district is manifesting a remarkably can-do spirit and a palpable will to succeed.In all these respects, the study of the Morris district reported on here is designed ultimately to extract lessons for other school districts in New Jersey and the rest of the nation. This report begins by exploring briefly the historical, political, and legal context of educational integration in New Jersey, and how that led to the creation of the Morris School District. It then analyzes and discusses the successes—and the challenges—of MSD's integration efforts. Along the way, it contrasts the successes of MSD with two other districts in New Jersey—Plainfield and New Brunswick—that attempted integration by district merger, but failed. It concludes by making recommendations not only for improvements in MSD's approach, but for school districts across New Jersey and the country that are seeking to integrate their schools and classrooms

The ATLAS Tile Calorimeter Test Beam Monitoring Program

During 2003 test beam session for ATLAS Tile Calorimeter a monitoring program has been developed to ease the setup of correct running condition and the assessment of data quality. The program has been built using the Online Software services provided by the ATLAS Online Software group. The first part of this note contains a brief overview of these services followed by the full description of Tile Calorimeter monitoring program architecture and features. Performances and future upgrades are discussed in the final part of this note.Comment: 11 pages, 8 figures, ATLAS TILECAL Not

Development of a multiblock procedure for automated generation of two-dimensional quadrilateral meshes of gear drives

This article describes a new multiblock procedure for automated generation of two-dimensional quadrilateral meshes of gear drives. The typical steps of the multiblock schemes have been investigated in depth to obtain a fast and simple way to mesh planar sections of gear teeth, allowing local mesh refinement and minimizing the appearance of distorted elements in the mesh. The proposed procedure is completed with two different mesh quality enhancement techniques. One of them is applied before the mesh is generated, and reduces the distortion of the mesh without increasing the computational time of the meshing process. The other one is applied once the mesh is generated, and reduces the distortion of the elements by means of a mesh smoothing method. The performance of the proposed procedure has been illustrated with several numerical examples, which demonstrate its ability to mesh different gear geometries under several meshing boundary conditions