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Articles 91 - 96 of 96

Full-Text Articles in Physical Sciences and Mathematics

Solute Transport In A Medium With Spatially Variable Porosity, B Malama, W Barrash, D W Hyndman, G Nelson Jan 2006

Solute Transport In A Medium With Spatially Variable Porosity, B Malama, W Barrash, D W Hyndman, G Nelson

Natural Resources Management and Environmental Sciences

No abstract provided.


On The Reliability Of An N-Component System, Don Rawlings, Lawrence Sze Jan 2006

On The Reliability Of An N-Component System, Don Rawlings, Lawrence Sze

Mathematics

Under assumptions compatible with the theory of Markov chains, we use a property of Vandermonde matrices to examine the reliability of an n-component system of production or service.


On The Existence Of Infinitely Many Closed Geodesics On Orbifolds Of Revolution, Joseph Borzellino, Christopher R. Jordan-Squire, Gregory C. Petrics, D. Mark Sullivan Jan 2006

On The Existence Of Infinitely Many Closed Geodesics On Orbifolds Of Revolution, Joseph Borzellino, Christopher R. Jordan-Squire, Gregory C. Petrics, D. Mark Sullivan

Mathematics

Using the theory of geodesics on surfaces of revolution, we introduce the period function. We use this as our main tool in showing that any two-dimensional orbifold of revolution homeomorphic to S2 must contain an infinite number of geometrically distinct closed geodesics. Since any such orbifold of revolution can be regarded as a topological two-sphere with metric singularities, we will have extended Bangert’s theorem on the existence of infinitely many closed geodesics on any smooth Riemannian two-sphere. In addition, we give an example of a two-sphere cone-manifold of revolution which possesses a single closed geodesic, thus showing that Bangert’s result …


An Empirical Evaluation Of The Impact Of Test-Driven Development On Software Quality, David S. Janzen Jan 2006

An Empirical Evaluation Of The Impact Of Test-Driven Development On Software Quality, David S. Janzen

Computer Science and Software Engineering

Test-driven development (TDD) has gained recent attention with the popularity of the Extreme Programming agile software development methodology. Advocates of TDD rely primarily on anecdotal evidence with relatively little empirical evidence of the benefits of the practice. This research is the first comprehensive evaluation of how TDD affects software architecture and internal design quality. Formal controlled experiments were conducted in undergraduate and graduate academic courses, in a professional training course, and with in-house professional development projects in a Fortune 500 company. The experiments involved over 230 student and professional programmers working on almost five hundred software projects ranging in size …


Advancing Candidate Link Generation For Requirements Tracing: The Study Of Methods, Jane Huffman Hayes, Alex Dekhtyar, Senthil Karthikeyan Sundaram Jan 2006

Advancing Candidate Link Generation For Requirements Tracing: The Study Of Methods, Jane Huffman Hayes, Alex Dekhtyar, Senthil Karthikeyan Sundaram

Computer Science and Software Engineering

This paper addresses the issues related to improving the overall quality of the dynamic candidate link generation for the requirements tracing process for verification and validation and independent verification and validation analysts. The contribution of the paper is four-fold: we define goals for a tracing tool based on analyst responsibilities in the tracing process, we introduce several new measures for validating that the goals have been satisfied, we implement analyst feedback in the tracing process, and we present a prototype tool that we built, RETRO (REquirements TRacing On-target), to address these goals. We also present the results of a study …


Cuoricino And Cuore Detectors: Developing Big Arrays Of Large Mass Bolometers For Rare Events Physics, P. Gorla, R. Ardito, C. Arnaboldi, D. R. Artusa, F. T. Avignone Iii, M. Balata, I. Bandac, M. Barucci, J. Beeman, C. Brofferio, C. Bucci, S. Capelli, F. Capozzi, L. Carbone, S. Cebrian, O. Cremonesi, R. J. Creswick, M. Dolinski, A. De Waard, H. A. Farach, F. Ferroni, E. Fiorini, G. Frossati, C. Gargiulo, A. Giuliani, E. Guardincerri, T. Gutierrez, E. E. Haller, I. G. Irastorza, E. Longo, G. Maier, R. Maruyama, R. J. Mcdonald, S. Morganti, A. Morales, S. Nisi, E. B. Norman, A. Nucciotti, E. Olivieri, P. Ottonello, M. Pallavicini, V. Palmieri, E. Pasca, M. Pavan, M. Pedretti, G. Pessina, S. Pirro, E. Previtali, B. Quiter, L. Risegari, C. Rosenfeld, S. Sangiorgio, M. Sisti, A. R. Smith, Toffanin, L. Torres, G. Ventura, N. Xu Jan 2006

Cuoricino And Cuore Detectors: Developing Big Arrays Of Large Mass Bolometers For Rare Events Physics, P. Gorla, R. Ardito, C. Arnaboldi, D. R. Artusa, F. T. Avignone Iii, M. Balata, I. Bandac, M. Barucci, J. Beeman, C. Brofferio, C. Bucci, S. Capelli, F. Capozzi, L. Carbone, S. Cebrian, O. Cremonesi, R. J. Creswick, M. Dolinski, A. De Waard, H. A. Farach, F. Ferroni, E. Fiorini, G. Frossati, C. Gargiulo, A. Giuliani, E. Guardincerri, T. Gutierrez, E. E. Haller, I. G. Irastorza, E. Longo, G. Maier, R. Maruyama, R. J. Mcdonald, S. Morganti, A. Morales, S. Nisi, E. B. Norman, A. Nucciotti, E. Olivieri, P. Ottonello, M. Pallavicini, V. Palmieri, E. Pasca, M. Pavan, M. Pedretti, G. Pessina, S. Pirro, E. Previtali, B. Quiter, L. Risegari, C. Rosenfeld, S. Sangiorgio, M. Sisti, A. R. Smith, Toffanin, L. Torres, G. Ventura, N. Xu

Physics

In the last 10 years bolometers have become extremely powerful detectors in the search for rare events, due to their very good resolution. Cuoricino, a 62 bolometer array, in the first months of activity reached a resolution (average in all detectors) in the energy region of interest (2528 keV) of 7 keV and a limit on the tn1/2 of the process of 7.5·10n23y. Cuoricino’s 62 detectors constitute the biggest number of macrobolometers (790 g each) ever cooled and demonstrate the feasibility of large arrays of bolometers. Following the indication of Cuoricino in CUORE R&D a new detector …