
Numerical Development
Science.gov (United States)
Siegler, Robert S.; Braithwaite, David W.
20160101
In this review, we attempt to integrate two crucial aspects of numerical development: learning the magnitudes of individual numbers and learning arithmetic. Numerical magnitude development involves gaining increasingly precise knowledge of increasing ranges and types of numbers: from nonsymbolic to small symbolic numbers, from smaller to larger…

Hindi Numerals.
Science.gov (United States)
Bright, William
In most languages encountered by linguists, the numerals, considered as a paradigmatic set, constitute a morphosyntactic problem of only moderate complexity. The IndoAryan language family of North India, however, presents a curious contrast. The relatively regular numeral system of Sanskrit, as it has developed historically into the modern…

Towards standard testbeds for numerical relativity
International Nuclear Information System (INIS)
Alcubierre, Miguel; Allen, Gabrielle; Bona, Carles; Fiske, David; Goodale, Tom; Guzman, F Siddhartha; Hawke, Ian; Hawley, Scott H; Husa, Sascha; Koppitz, Michael; Lechner, Christiane; Pollney, Denis; Rideout, David; Salgado, Marcelo; Schnetter, Erik; Seidel, Edward; Shinkai, Hisaaki; Shoemaker, Deirdre; Szilagyi, Bela; Takahashi, Ryoji; Winicour, Jeff
20040101
In recent years, many different numerical evolution schemes for Einstein's equations have been proposed to address stability and accuracy problems that have plagued the numerical relativity community for decades. Some of these approaches have been tested on different spacetimes, and conclusions have been drawn based on these tests. However, differences in results originate from many sources, including not only formulations of the equations, but also gauges, boundary conditions, numerical methods and so on. We propose to build up a suite of standardized testbeds for comparing approaches to the numerical evolution of Einstein's equations that are designed to both probe their strengths and weaknesses and to separate out different effects, and their causes, seen in the results. We discuss general design principles of suitable testbeds, and we present an initial round of simple tests with periodic boundary conditions. This is a pivotal first step towards building a suite of testbeds to serve the numerical relativists and researchers from related fields who wish to assess the capabilities of numerical relativity codes. We present some examples of how these tests can be quite effective in revealing various limitations of different approaches, and illustrating their differences. The tests are presently limited to vacuum spacetimes, can be run on modest computational resources and can be used with many different approaches used in the relativity community

Towards standard testbeds for numerical relativity
Energy Technology Data Exchange (ETDEWEB)
Alcubierre, Miguel [Inst. de Ciencias Nucleares, Univ. Nacional Autonoma de Mexico, Apartado Postal 70543, Mexico Distrito Federal 04510 (Mexico); Allen, Gabrielle; Goodale, Tom; Guzman, F Siddhartha; Hawke, Ian; Husa, Sascha; Koppitz, Michael; Lechner, Christiane; Pollney, Denis; Rideout, David [MaxPlanckInst. fuer Gravitationsphysik, AlbertEinsteinInstitut, 14476 Golm (Germany); Bona, Carles [Departament de Fisica, Universitat de les Illes Balears, Ctra de Valldemossa km 7.5, 07122 Palma de Mallorca (Spain); Fiske, David [Dept. of Physics, Univ. of Maryland, College Park, MD 207424111 (United States); Hawley, Scott H [Center for Relativity, Univ. of Texas at Austin, Austin, Texas 78712 (United States); Salgado, Marcelo [Inst. de Ciencias Nucleares, Univ. Nacional Autonoma de Mexico, Apartado Postal 70543, Mexico Distrito Federal 04510 (Mexico); Schnetter, Erik [Inst. fuer Astronomie und Astrophysik, Universitaet Tuebingen, 72076 Tuebingen (Germany); Seidel, Edward [MaxPlanckInst. fuer Gravitationsphysik, AlbertEinsteinInst., 14476 Golm (Germany); Shinkai, Hisaaki [Computational Science Div., Inst. of Physical and Chemical Research (RIKEN), Hirosawa 21, Wako, Saitama 3510198 (Japan); Shoemaker, Deirdre [Center for Radiophysics and Space Research, Cornell Univ., Ithaca, NY 14853 (United States); Szilagyi, Bela [Dept. of Physics and Astronomy, Univ. of Pittsburgh, Pittsburgh, PA 15260 (United States); Takahashi, Ryoji [Theoretical Astrophysics Center, Juliane Maries Vej 30, 2100 Copenhagen, (Denmark); Winicour, Jeff [MaxPlanckInst. fuer Gravitationsphysik, AlbertEinsteinInstitut, 14476 Golm (Germany)
20040121
In recent years, many different numerical evolution schemes for Einstein's equations have been proposed to address stability and accuracy problems that have plagued the numerical relativity community for decades. Some of these approaches have been tested on different spacetimes, and conclusions have been drawn based on these tests. However, differences in results originate from many sources, including not only formulations of the equations, but also gauges, boundary conditions, numerical methods and so on. We propose to build up a suite of standardized testbeds for comparing approaches to the numerical evolution of Einstein's equations that are designed to both probe their strengths and weaknesses and to separate out different effects, and their causes, seen in the results. We discuss general design principles of suitable testbeds, and we present an initial round of simple tests with periodic boundary conditions. This is a pivotal first step towards building a suite of testbeds to serve the numerical relativists and researchers from related fields who wish to assess the capabilities of numerical relativity codes. We present some examples of how these tests can be quite effective in revealing various limitations of different approaches, and illustrating their differences. The tests are presently limited to vacuum spacetimes, can be run on modest computational resources and can be used with many different approaches used in the relativity community.

Public Energy Education: Issues for Discussion. Draft.
Science.gov (United States)
Public Energy Education Task Force.
This paper was intended to stimulate discussion of energy education issues at a conference on energy issues. The discussion ranges through numerous topics at issue in energy education including public energy awareness, definition of public education, the distinction between public education and public relations, and the presentation of a model…

Discussion on nuclear issues
International Nuclear Information System (INIS)
Andrlova, Z.
20120101
Treatment of the radioactive waste and utilisation of the ionisation radiation. Interesting contributions to two topics appeared in conference of Slovak Nuclear Society in CastaPapiernicka in May 2012. The members from the female section 'Women in nuclear sector; were discussing in particular of the mindset of Europeans to radioactive waste and novelties in nuclear medicine. (author)

Summary of discussion
International Nuclear Information System (INIS)
20060101
This document provides summaries of the discussions occurred during the second international workshop on the indemnification of nuclear damage. It concerns the second accident scenario: a fire on board of a ship transporting enriched uranium hexafluoride along the Danube River. (A.L.B.)

Discussion 2: David Dobbs
OpenAIRE
Dobbs, David; MurrayRust, Peter; Hatcher, Jordan; Pollock, Rufus
20100101
David Dobbs writes on science, medicine and culture. He has contributed to a diversity of publications, including Scientific American, Slate magazine, Wired, Audubon, Atlantic Monthly, and the New York Times magazine. He has also authored a number of books. Other participants in this discussion were Peter MurrayRust, Jordan Hatcher, and Rufus Pollock.

Summary and Discussion.
Science.gov (United States)
Hetherington, E. Mavis
19920101
Summarizes and discusses results of the longitudinal study that comprises this monograph issue. Results concern: (1) marital, parentchild, and sibling relationships in families with single and remarried mothers; (2) the relationship between parenting style and adolescent adjustment; and (3) the relationship between marital transitions and…

WORKSHOP: Discussion, debate, deliberation
NARCIS (Netherlands)
Jeliazkova, Margarita I.
20140101
Discussing, deliberating and debating are a core part of any democratic process. To organise these processes well, a great deal of knowledge and skill is required. It is not simple to find a good balance between a number of elements: appropriate language and terminology; paying attention to solid

Magni Reproducibility Example
DEFF Research Database (Denmark)
20160101
An example of how to use the magni.reproducibility package for storing metadata along with results from a computational experiment. The example is based on simulating the Mandelbrot set.......An example of how to use the magni.reproducibility package for storing metadata along with results from a computational experiment. The example is based on simulating the Mandelbrot set....

Numerical analysis of the bearing capacity of complex rock mechanical underground systems with filigree structures in the presence of imponderables. A contribution to the systematization of the investigative process with application/demonstration using the example of the salt cavern ASSE II/south flank; Numerische Analyse des Tragverhaltens komplexer gebirgsmechanischer untertaegiger Systeme mit filigranen Strukturen bei Anwesenheit von Imponderabilien. Ein Beitrag zur Systematisierung des Untersuchungsprozesses mit Anwendung/Demonstration am Beispiel des Salzbergwerks Schacht ASSE II/Suedflanke
Energy Technology Data Exchange (ETDEWEB)
Dyogtyev, Oleksandr
20170302
The thesis dealing with the numerical analysis of the bearing capacity of complex rock mechanical underground systems with filigree structures in the presence of imponderables covers the following issues: status of science and technology, concept for the performance of numerical studies on the bearing capacity of largevolume underground systems, application example salt cavern ASSE II  application of the developed concept/development of numerical tools for the overall system/application of the global model to the given questions/realization of the modification potential.

Panel discussion : contract design
Energy Technology Data Exchange (ETDEWEB)
Vallas, A. [Sempra Energy Trading, Toronto, ON (Canada); Vegh, G. [MacLeod Dixon, Toronto, ON (Canada); McGee, M. [Energy Profiles Ltd., Etobicoke, ON (Canada); Zaremba, T. [Direct Energy Marketing, Calgary, AB (Canada); Seshan, A. [Larson and Toubro Information Technology, Toronto, ON (Canada); Harricks, P. [Gowlings, Toronto, ON (Canada); Bertoldi, L. [Borden Ladner Gervais, Toronto, ON (Canada); Taylor, R. [Hydro One Networks Inc., Markham, ON (Canada)
20030501
This session presented highlights of the comments of 8 panelists who discussed the issue of contract design. The new electricity market in Ontario has introduced the energy trader, who enters into a contract with the consumer, based on the spot price set by the Independent Electricity Market Operator. Every contract has a fixed price payer as well as floatingprice payers. If the floating price for a given amount of energy is higher than the fixed price, then the consumer gets the difference. Confusion, however, arises with the purchase of retail physical power in the market, particularly in deciding a fixed rate that the consumer will be paying. Different billing options were also discussed with emphasis on mid to large retail customers that have portfolios in the tens of MW and up to 100 MW or more. figs.

Panel discussion : contract design
International Nuclear Information System (INIS)
Vallas, A.; Vegh, G.; McGee, M.; Zaremba, T.; Seshan, A.; Harricks, P.; Bertoldi, L.; Taylor, R.
20030101
This session presented highlights of the comments of 8 panelists who discussed the issue of contract design. The new electricity market in Ontario has introduced the energy trader, who enters into a contract with the consumer, based on the spot price set by the Independent Electricity Market Operator. Every contract has a fixed price payer as well as floatingprice payers. If the floating price for a given amount of energy is higher than the fixed price, then the consumer gets the difference. Confusion, however, arises with the purchase of retail physical power in the market, particularly in deciding a fixed rate that the consumer will be paying. Different billing options were also discussed with emphasis on mid to large retail customers that have portfolios in the tens of MW and up to 100 MW or more. figs

Discussion with CERN Directorate
CERN Document Server
CERN. Geneva
20170101
Please note that the Discussion with CERN Directorate will be transmitted also in the following rooms: Council Chamber  5031001 IT Amphitheatre  313004 Prevessin 774R013 Simultaneous interpreting into French and English will be available in the Main Auditorium. Une interprétation simultanée en français et en anglais sera disponible dans l'amphithéâtre principal.

Numerical analysis
CERN Document Server
Scott, L Ridgway
20110101
Computational science is fundamentally changing how technological questions are addressed. The design of aircraft, automobiles, and even racing sailboats is now done by computational simulation. The mathematical foundation of this new approach is numerical analysis, which studies algorithms for computing expressions defined with real numbers. Emphasizing the theory behind the computation, this book provides a rigorous and selfcontained introduction to numerical analysis and presents the advanced mathematics that underpin industrial software, including complete details that are missing from most textbooks. Using an inquirybased learning approach, Numerical Analysis is written in a narrative style, provides historical background, and includes many of the proofs and technical details in exercises. Students will be able to go beyond an elementary understanding of numerical simulation and develop deep insights into the foundations of the subject. They will no longer have to accept the mathematical gaps that ex...

Time Series Analysis and Forecasting by Example
CERN Document Server
Bisgaard, Soren
20110101
An intuitionbased approach enables you to master time series analysis with ease Time Series Analysis and Forecasting by Example provides the fundamental techniques in time series analysis using various examples. By introducing necessary theory through examples that showcase the discussed topics, the authors successfully help readers develop an intuitive understanding of seemingly complicated time series models and their implications. The book presents methodologies for time series analysis in a simplified, examplebased approach. Using graphics, the authors discuss each presented example in

Discussion Club "Profitable Heritage"
Directory of Open Access Journals (Sweden)
Marina Tkacheva
20170901
Full Text Available The authors and participants of the project and the expert community analyze the problems related to the realization of a bigscale concept of renovation of the historical center “Irkutsk Quarters”. They discuss preservation of wooden architecture of the city, changes in social functions of the territory, inclusion of the new facilities in the fabric of the area, as well as the problems of the territory’s tourist function and preservation of the identity of Irkutsk downtown.

Panel discussion: Nuclear cardiology
International Nuclear Information System (INIS)
Schwaiger, M.
19910101
The panel discussion opened with a question concerning whether true quantification of myocardial sympathetic presynaptic function or receptor density can be obtained with currently available radiopharmaceuticals. What are the relative advantages of the two general approaches that have been proposed for quantification: (1) The assessment of tracer distribution volume in tissue following bolus injection and (2) quantification based on tracer displacement kinetics following administration of excess unlabeled tracer. It was pointed out that tracer kinetics for the delineation of presynaptic and postsynaptic binding sites by radiopharmaceuticals or radiolabeled receptor antagonists are rather complex, reflecting several physiologic processes that are difficult to separate. Several approaches were examined. The possibility of regional definition of receptor density by PET was questioned and it was noted that regions of interest can be applied to calculate regional receptor kinetics. However, due to the limited spatial resolution of PET, only average transmural values can be determined. The discussion then turned to the discrepancy between the known sparse parasympathetic innervation of the heart and the high density of muscarinic receptors observed with PET. Experiences with MIBG imaging were reported, including uptake in the transplanted heart and interaction of drugs with MIBG uptake

Spectral methods in numerical plasma simulation
International Nuclear Information System (INIS)
Coutsias, E.A.; Hansen, F.R.; Huld, T.; Knorr, G.; Lynov, J.P.
19890101
An introduction is given to the use of spectral methods in numerical plasma simulation. As examples of the use of spectral methods, solutions to the twodimensional Euler equations in both a simple, doubly periodic region, and on an annulus will be shown. In the first case, the solution is expanded in a twodimensional Fourier series, while a ChebyshevFourier expansion is employed in the second case. A new, efficient algorithm for the solution of Poisson's equation on an annulus is introduced. Problems connected to aliasing and to short wavelength noise generated by gradient steepening are discussed. (orig.)